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Gas Tank Project of Guangdong SGIS Songshan Co., Ltd.

South China Institute of Environmental Sciences, Ministry of Environmental Protection of the People’s Republic of China

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Guangdong SGIS Songshan Co., Ltd.

Gas Tank Project

Environmental Impact Assessment Report

(Final version)


May 2008



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EIA Document: Guangdong SGIS Songshan Co., Ltd.

Gas Tank Project

Assessment Unit: South China Institute of Environmental Sciences, Ministry of Environmental Protection of the People’s Republic of China

Document Type: Environmental Impact Assessment Report

Legal representative: Zhang Jianming



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Project Title: Gas Tank Project of Guangdong SGIS Songshan Co., Ltd.

Entrusting Unit: Guangdong SGIS Songshan Co., Ltd.

Assessment Unit: South China Institute of Environmental Sciences, Ministry of Environmental Protection (GuoHuanPingZhengJiaZi No. 2801) Unit legal person: Zhang Jianming (Director) Cooperative Unit: Shaoguan Environmental Monitoring Station Responsible Persons: Xie Wenzhang (Researcher) Signature: (Registered EIA Engineer Certificate No.: A28010060500) Compiled by:

Name Title No. of EIA Registration Certificate or EIA Post Certificate

Compiled Chapters Signature

Bian Guojian Engineer Registered EIA Certificate No.: A28010480400

Chapter 6, Chapter 7, Chapter 12 and Chapter 13

Yang Yuqing Senior Engineer

Registered EIA Certificate No.: A28010160500

Chapters 3, 4, 8 and 9

Sang Yanhong Engineer Registered EIA Certificate No.:

Long Yingxian Engineer Registered EIA Certificate No.:

Qu Qun Engineer Registered EIA Certificate No.:

Approved by: Zhong Changqin (Senior Engineer, Registered EIA Certificate No.: A28010190600), Signature: Approved by: Dong Lin (Researcher, Registered EIA Certificate No.: A28010141000) Signature:



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Table of Contents

1 GENERAL PRINCIPLES ................................................................................................................... 1 1.1 BACKGROUND............................................................................................................................... 1 1.2 COMPILATION BASIS ..................................................................................................................... 2 1.3 ASSESSMENT OBJECTIVE, PRINCIPLES AND METHODS.................................................................... 3 1.4 OBJECTIVES FOR POLLUTION CONTROL, ENVIRONMENT ZONING AND PROTECTION ...................... 4 1.5 ASSESSMENT GRADES AND POINTS ................................................................................................ 7 1.6 ASSESSMENT SCOPE AND ASSESSMENT FACTOR .......................................................................... 8 1.7 ASSESSMENT STANDARDS .............................................................................................................. 9

2 PROJECT PROFILE .........................................................................................................................12 2.1 NAME, NATURE AND INVESTMENT OF THE PROJECT ..................................................................12 2.2 CONSTRUCTION SCALE, LOCATION AND LABOR REQUIREMENT OF .........................................12 2.3 MAIN CONSTRUCTION CONTENT OF PROJECT ...........................................................................14 2.4 WORKING PRINCIPLE OF GAS TANK ...........................................................................................27 2.5 GENERAL LAYOUT PLAN...............................................................................................................29 2.6 EXISTING GAS TANK OF SGIS ......................................................................................................32

3 ENGINEERING ANALYSIS.............................................................................................................36 3.1 RAW MATERIALS AND ENERGY CONSUMPTION............................................................................36 3.2 WATER USAGE AND WATER BALANCE IN THE PROJECT ...............................................................38 3.3 ANALYSIS ON THE PROCESS FLOW AND THE POLLUTANT PRODUCING PROCESS ........................45 3.4 ANALYSIS ON THE POLLUTION SOURCE STRENGTH DURING OPERATION OF TANK AREA........48

4 GENERAL ENVIRONMENT IN PROJECT SURROUNDING AREA .......................................57 4.1 NATURAL ENVIRONMENT ............................................................................................................57 4.2 SOCIETY AND ECONOMY ..............................................................................................................59

5 ASSESSMENT OF THE EXISTING BASELINE ENVIRONMENTAL QUALITY ..................61 5.1 EXISTING BASELINE SURVEY AND ASSESSMENT OF THE AMBIENT AIR QUALITY .....................61 5.2 INVESTIGATION OF EXISTING BASELINE OF WATER ENVIRONMENT QUALITY ............................66 5.3 MONITORING AND EVALUATION OF EXISTING BASELINE OF ACOUSTIC ENVIRONMENT QUALITY ...................................................................................................................................................76 5.4 MONITORING AND EVALUATION OF EXISTING BASELINE OF SOIL ENVIRONMENT QUALITY ....77

6 ENVIRONMENTAL IMPACT ANALYSIS (COMPILED BY QU AND BIAN).........................81 6.1 PREDICTION AND ASSESSMENT OF AMBIENT AIR IMPACT............................................................81 6.2 RIVER ENVIRONMENT IMPACT ANALYSIS ...................................................................................96 6.3 WATER ENVIRONMENT IMPACT ASSESSMENT ............................................................................98 6.4 SOLID WASTE ENVIRONMENTAL IMPACT ASSESSMENT ............................................................102 6.5 ASSESSMENT OF ECOLOGICAL ENVIRONMENT IMPACT...........................................................102

7. ENVIRONMENTAL IMPACT ANALYSIS FOR CONSTRUCTION PERIOD.......................103 7.1 ENVIRONMENTAL IMPACT ANALYSIS FOR THE CONSTRUCTION SEWAGE................................103 7.2 ENVIRONMENTAL IMPACT ANALYSIS FOR THE CONSTRUCTION DUST .....................................103 7.3 IMPACT ANALYSIS FOR CONSTRUCTION NOISES.......................................................................105 7.4 ANALYSIS ON ENVIRONMENTAL IMPACT OF SOLID WASTE ......................................................108 7.5 ANALYSIS ON IMPACT OF SOIL EROSION...................................................................................108 7.6 ENVIRONMENT SUPERVISION DURING CONSTRUCTION ...........................................................109

8 RISK ASSESSMENT........................................................................................................................ 111



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8.1 GENERAL PRINCIPLES ................................................................................................................111 8.2 IDENTIFICATION, ANALYSIS AND ENVIRONMENT SENSITIVE ELEMENTS ...............................113 8.3 IDENTIFICATION OF ENVIRONMENT RISKS OF THE PROJECT ..................................................114 8.4. MAXIMUM CREDIBLE ACCIDENT AND POLLUTANTS TRANSFER ROUTE UNDER AN ACCIDENT CIRCUMSTANCE ......................................................................................................................................122 8.5 ANALYSIS AND FORECAST ON ENVIRONMENTAL RISK IMPACT ..............................................127 8.6 RISK PREVENTION MEASURES ...................................................................................................140 8.7 EMERGENCY SCHEME ................................................................................................................146 8. 8 “THREE SIMULTANEOUS” CHECK TABLE FOR ENVIRONMENT SAFETY...........................................149

9 CLEANER PRODUCTION AND MASS LOADING CONTROL...............................................150 9.1 CLEANER PRODUCTION ANALYSIS ...............................................................................................150 9.2 OVERALL ENVIRONMENTAL PROTECTION EFFECT OF THE GAS TANK......................................150 9.3 ANALYSIS OF THE CLEANER PRODUCTION LEVEL OF THE SELECTED TANK TYPE ....................150 9.4 ANALYSIS ON RESOURCE UTILIZATION AND ENERGY CONSERVATION ....................................153 9.5 CONCLUSION OF CLEANER PRODUCTION ASSESSMENT ...........................................................154 9.6 ANALYSIS OF TOTAL VOLUME CONTROL ..................................................................................154

10 POLLUTION CONTROL MEASURES AND TECHNICAL FEASIBILITY STUDY..............156 10.1 DEMONSTRATION OF WASTEWATER CONTROL MEASURES ............................................................156 10.3 DEMONSTRATION OF SOLID WASTE CONTROL MEASURES .............................................................159 10.4 DEMONSTRATION OF NOISE CONTROL MEASURES ........................................................................159

11 PUBLIC PARTICIPATION ...........................................................................................................160 11.1 THE PURPOSE AND SIGNIFICANCE OF PUBLIC PARTICIPATION........................................................160 11.2 STAGE AND MODE OF PUBLIC PARTICIPATION................................................................................160 11. 3. MODE AND SCOPE OF THE INVESTIGATION ...............................................................................165 11. 4. RESULT ANALYSIS OF PUBLIC INVESTIGATION..........................................................................166 11. 5 PUBLIC OPINIONS ON THE NOTICE OF THE SIMPLIFIED VERSION OF THE REPORT...........................172 11. 6 CONCLUSION ON PUBLIC PARTICIPATION ......................................................................................172

12 ANALYSES OF COMPLIANCE TO INDUSTRIAL POLICIES AND LOCATION REASONABILITY....................................................................................................................................173

12. 1 ANALYSIS OF COMPLIANCE TO INDUSTRIAL POLICIES...................................................................173 12. 2 REASONABILITY ANALYSIS OF FACTORY LOCATION ....................................................................173

13 ANALYSIS OF ECONOMIC GAIN AND LOSS...........................................................................175 13.1 INVESTMENT ON ENVIRONMENTAL PROTECTION OF THE PROJECT TO BE BUILT...........................175 13. 2 ANALYSIS OF OVERALL ENVIRONMENT AND SOCIOECONOMIC PERFORMANCE OF PROJECT .......176 13. 3 CONCLUSION TO THE ANALYSIS OF ENVIRONMENTAL AND ECONOMIC GAIN AND LOSS ..............177

14 ENGIVORMENT MANGEMENT AND MONITORING PLAN ................................................178 14. 1 RESPONSIBILITIES OF ENVIRONMENT MANAGEMENT ORGANIZATION.........................................178 14. 2 ENVIRONMENT MONITORING SYSTEM.........................................................................................178 14. 3 ENVIRONMENTAL MANAGEMENT PLAN........................................................................................180 14. 4 SUGGESTIONS ON STRENGTHENING ENVIRONMENT MANAGEMENT ............................................181

15 ASSESSMENT CONCLUSIONS AND RECOMMENDATIONS................................................184 15. 1 PROJECT OVERVIEW ...................................................................................................................184 15. 2 ENGINEERING ANALYSIS..............................................................................................................184



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1 General Principles

1.1 Background

Guangdong SGIS Songshan Co., Ltd. is located on Meihua River valley plain 3km east of Maba Town, Shaoguan City of Guangdong Province. Established in 1966, it has become a large million-ton integrated enterprise of steel and iron with over 30 years of development. The Plant is near Maba Station on Beijing-Guangzhou Railway, and roads in the Plant are linked with Beijing-Zhuhai Highway, thus the transportation is convenient. SGIS now boasts two 100,000m3 blast furnace gas tanks, one 70,000m3 coke oven gas tank, one 20,000m3 coke oven gas tank for industrial use, one 80,000m3 converter gas tank, one 20,000m3 coke oven gas tank for civil use, one blast furnace/coke oven/converter gas mixing and pressurization station (with capacity of 100,000m3/h), one blast furnace/coke oven gas mixing and pressurization station (with a capacity of 30,000m3/h), and two coke oven gas pressurization stations with a compressing capacity of 3000m3/h. The designed gas tank project is on the east of existing gas tank area and north of SGIS production area. The Project covers an area of 72,600m2 with Meihua River (after diversion) to its north, 6# blast furnace electric blast station to its south and farmland and fishery to its east. The investment of the Project is 344,520,000 RMB in total, 0.33% of which is directly used for environmental protection, i.e. 1,127,200 RMB. The gas tank project was a new construction project for the enlargement of production capacity of SGIS. The main facilities include one 300,000m3 blast furnace gas tank, two 80,000m3 converter gas tanks, one 100,000m3 coke oven gas tank for industrial use and one 30,000m3 coke oven gas tank for civil use, as well as relevant auxiliary facilities. The occupied area of the project is 72600m2, and the total investment is 344.52 million RMB , including 1.1272 million RMB of the direct investment on environment and which is accounted for 0.33% of the total investment. After completion of the new gas tank, one old blast furnace gas tanks will be out of service. By the end of the 11th Five-Year Plan, SGIS plans to increase annual output of coke oven gas from present 48,000 m3/h to 139,000 m3/h, increase annual output of blast furnace gas from present 603,000 m3/h to 1,650,000 m3/h and increase annual output of converter gas from present 45,000 m3/h to 136,000 m3/h. Gas consumption shall multiple accordingly. With the implementation of Projects in the 11th Five-Year Plan gradually, the existing balanced gas supply system shall be broken. Existing gas facilities could not satisfy the demand of development in advancement of the 11th Five-Year Plan any more. To balance the pressure of pipe network, ensure the balance between production and application of gas, achieve safe supply and use of gas, reduce gas dispersing, save energy and protect surrounding environment, it is imperative for SGIS to start construction of the gas tank project under the 11th Five-Year Plan. The construction of the gas tank area is the collection of blast furnace gas, coking oven gas and converter gas, and then available for consumers. Referring to the Code 40 Guidance Directory for Adjustment of Industrial Structures (National Development and Reform Commission, Fa Gai Wei Order No. 40), it belongs to the encouraged-type project and complies with requirements of the national industrial policies. According to Circular on Submission of Fund Application Report for 1st Alternative Projects on Resource Saving and Environmental Protection in 2007 HuanZi (2007) No. 002, CDQ transformation project of SGIS Group Corporation has been in the list. In accordance with Regulations on the Administration of Construction Project Environmental Protection (Decree No. 253 of the State Council in 1998) and relevant provisions of the Province on administration of construction project environmental protection, if the construction project is likely to cause serious impact on the environment, environmental impact assessment (EIA) must be conducted, EIA report must be compiled and relevant examination and approval system must be implemented in order to effectively control appearance of new pollution sources, protect the environment and realize sustainable development.



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After receiving the entrustment, the undertaking unit organizes to conduct field survey and data research on the construction project and compile the EIA report in accordance with specific requirements of the State on the compilation of the EIA reports.

1.2 Compilation Basis

1.2.1 Nationwide Laws & Regulations

(1) Environmental Protection Law of the People’s Republic of China (Dec. 1989);

(2) Law of the People's Republic of China on Prevention and Control of Atmospheric Pollution (revised in May. 1996);

(3) Law of the People's Republic of China on Prevention and Control of Water Pollution (revised in Apr.2000);

(4) Law of the People's Republic of China on Prevention and Control of Noise Pollution (Oct. 1996);

(5) Law of the People's Republic of China on Prevention and Control of Environmental Pollution by Solid Wastes (Apr. 2005);

(6) Law of the People's Republic of China on Cleaner Production Promotion (2002);

(7) Regulations on the Administration of Construction Project Environmental Protection (Nov. 1998);

(8) Administration of Construction Project Environmental Protection by Means of Classification Catalogue，Ministry of Environmental Protection of the People’s Republic of China，Decree No. 14;

(9) Regulations on Grading Approval for Environmental Impact Assessment Documents of Construction Project, Ministry of Environmental Protection of the People’s Republic of China，Decree No. 164;

(10) Opinions on Enforcing Water Conservation Work of Industry, GuoJingMaoZiYuan [2000] No. 1015 ;

(11) Several Provisions on Development of Combined Heat and Power Production, State Development and Planning Commission, JiJiaoNeng (1998) No. 220;

(12) Regulations of the State Council on Issues Concerning Acid Rain and SO2 Control Zones, GuoHan (98) No. 5;

(13) Replies of the State Council on the Tenth Five-Yean Plan of Pollution Control in Acid Rain and SO2 Zones, GuoHan (2002) No. 84;

(14) Policy on Technologies for Prevention and Control of SO2 Emissions from Coal Burning, Ministry of Environmental Protection of the People’s Republic of China, State Economic and Trade Commission and the Ministry of Science and Technology [2002] No. 26;

(15) Development Policies for the Iron and Steel Industry (Jul. 2005);

(16) Circular on Strengthening Environmental Impact Assessment Management and Preventing Environmental Risks (HuanFa (2005) No. 125);

(17) Interim Measures of the Public Participation in Environmental Impact Assessment, (HuanFa (2006) No. 28);

(18) Law of the People's Republic of China on Environmental Impact Assessment;

1.2.2 Local Laws & Regulations

(1) Regulations of Guangdong Province on the Administration of Construction Project Environmental



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Protection (Sep. 1997), revised on the 31st Session of the 8th Standing Committee of Guangdong Provincial People’s Congress;

(2) Guidelines of Guangdong Province on the Administration of Construction Project Environmental Protection (trial) (Sep. 2000), Guangdong Environmental Protection Bureau YueHuanJian (2000) No.8;

(3) Scheme for Adjustment of Guangdong Industrial Structures, YueFuBan (2001) No.74; (4) Division of Guangdong Surface Water Environmental Function Areas, YueFuHan (1999) No.553; (5) Guangdong Blue Sky Project, YueFuBan (2001) No.7; (6) Guangdong Green Water Project, YueFuBan (1997) No.29; (7) Circular on Printing and Issuing Control Objectives of Total Amount of Emission from Major Pollutants in Each

County (City, District) during 11th Five-Year Plan, ShaoHuan (2006) No. 178; (8) Scheme for Adjustment of Guangdong Industrial Structures (Apr. 2006); (9) General Plan of Guangdong Provincial Environmental Protection (2006-2020); (10) Circular on Printing and Issuing Guangdong Provincial Regulations on Grading Approval for

Environmental Impact Assessment Documents of Construction Project；

(11) Implementation opinion for public participation in environmental management of construction projects in Guangdong Province (Yue Huan [2007] No. 99);

1.2.3 Technical Guidelines and Criterions

(1) Technical Guidelines for Environmental Impact Assessment---General Principles (HJ/T2.1-93); (2) Technical Guidelines for Environmental Impact Assessment---Acoustic Environment (HJ/T2.2-93); (3) Technical Guidelines for Environmental Impact Assessment---Surface Water Environment

(HJ/T2.3-93); (4) Technical Guidelines for Environmental Impact Assessment---Atmospheric Environment (HJ/T2.2-95); (5) Technical Guidelines for Environmental Impact Assessment---Non-Polluted Ecological Impact;

(HJ/T19-1997) (6) Technical Guidelines for Environmental Risks Assessment of Construction Project (HJ/T169-2004); (7) Technical Guidelines for Environmental Impact Assessment (HJ/T2.1-2.3—93, HJ/T2.4—1995); (8) Technical Methods for Making Local Emission Standards of Air Pollutants (GB/T13201-91);

1.2.4 Other Basis

(1) Feasibility Research Report on Gas Tank Project of Guangdong SGIS Songshan Co., Ltd. compiled by CISDI Engineering Co., Ltd. in Nov. 2007 and relevant engineering data ;

1.3 Assessment Objective, Principles and Methods

1.3.1 Assessment Objective

To comprehend environmental features in regions of assessment through research on existing baselines of natural environment and social environment surrounding the site of construction project; to find out engineering features and pollutant emission features of the proposed project through analysis of engineering, pollution source and prevention and control measures.



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According to local environment features and pollution source features, analysis and predict pollutant emission conditions after trial production of this Project, and degree and scope of impact on surrounding environment as well as possible changes in environment quality; predict the probability and outcome of risk accidents, and put forward emergency response measures and precautions; in accordance with cleaner production and mass loading control and other requirements, explain why the technologies and equipment used in this Project are cutting-edge, and why the environmental facilities are reliable and reasonable, and meanwhile propose countermeasures and suggestions on prevention, control and alleviation of pollution.

1.3.2 Assessment Principles

In order to realize the above objectives, this environmental assessment adopts the following principles: on the basis of principles such as “mass loading control”, “cleaner production” and “discharge up to standards” for pollutants, minimize pollutant discharge amount of the Project, control total amount of pollutant discharge after the launch of the Project in a specified range, and promote integrated and coordinated development of local economic, environmental and social performances. Try to work out the following contents:

(1) The situation survey has a specified target and practical significance;；

(2) Pollution source survey and source intensity calculation embody the characteristics of the proposed project;

(3) As for the prediction and assessment of environmental risk impact, the methods are feasible and the results are reliable, and it can really prevent the potential risks and protect the environment.

(4) Obey policies and regulations of the State on environmental protection such as “mass loading control of pollutants” and “discharge up to standards”;

(5) Pollution prevention measures, implementing effects of environmental protection schemes, existing problems, and analysis and suggestions for improvement.

1.3.3 Assessment Methods

(1) Focus on assessment of existing baseline and conduct surveys to confirm environmental pollution by emission and environment quality status after trial production of the project;

(2) Make full use of environment data and information available on the region of the project; (3) Analysis of pollution source shall be conducted by analogy analysis method, empirical coefficient

method and pattern calculation method, and meanwhile check pollutant emission from transformation projects with practical evaluation results;

(4) Integrated use of qualitative and quantitative analysis; (5) Analysis on the basis of local planning and the State’s industrial policies; (6) Recommended assessment methods in Technical Guidelines for Environmental Impact Assessment

promulgated by the State.

1.4 Objectives for Pollution Control, Environment Zoning and Protection

1.4.1 Objectives for Pollution Control

(1) All pollution sources are under reasonable and appropriate control, and their impact on the



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environment is minimized by strengthening of technical measures and management measures;

(2) By actively promoting the principle of cleaner production, each technical and economic index of cleaner production reach domestic advanced level;

(3) Each pollution source discharges up to standards;

(4) Mass loading control of major pollutants at each pollution source;

(5) In compliance with the principle of recycling and economy, realize reasonable use of energy and resources.

Fig 1.4-1 Objective for Ambient Air Protection



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1.4.2 Objectives for Environmental Protection

According to features of the project and ambient environment situation, objectives for environmental protection in this Assessment are as follows:

(1) Objective for ambient air protection: Ensure no harm against living environment quality of residents in and around the Plant; ensure no harm against environment sensitive places including Fossil Site of Lion’s Crag Primitives (Ancient Maba People) 5km away in the southwest of the Plant and Nanhua Temple 10km away (refer to Table 1.4-1 for details, and see relative locations in Figure 1.4-1). According to Principle and Technical Methods for Regionalizing Ambient Air Quality Function (HJ14-1996) and Environmental Impact Assessment Report on Technical Reformation Project of Slab Continuous Caster and Medium Plate Mill in Guangdong SGIS Songshan Co., Ltd. replied by Guangdong Environmental Protection Bureau, as for Shaoguan Steel Plant, the outside belongs to Grade II ambient air quality function zone while the inside belongs to Grade III ambient air quality function zone.

Monitoring point Objective Location Distance from the

project boundary (m) Atmospheric

Function Zone Object

Plant Site / / Grade III Zone Employee

1# Old Xiaojiang Village WS 2300 Grade II Zone Residents: 330

2# New Xiaojiang Village WS 3500 Grade II Zone Residents: 250

3# Daping Village W 2550 Grade II Zone Residents: 180 4# Liantang Village WN 1200 Grade II Zone Residents: 200 5# Yumin Village NW 3500 Grade II Zone Residents: 200 6# Shuibei Village EN 2250 Grade II Zone Residents: 210

7# Maba No. 3 Primary School SW 5000 Grade II Zone Teachers and

Students: 600 8# Da Yuantou NE 1550 Grade II Zone Residents: 400

9# Shaogang No. 1 Middle School SE 3900 Grade II Zone Students

10# Meihuazhai Village NW 3250 Grade II Zone Residents

11# XinZhai SE 6000 Grade II Zone Residents 12# Maba Town SW 8400 Grade II Zone Residents 13# Nanhua Temple S 10500 Grade II Zone Tourists 14# Shanzibei WN 1000 Grade II Zone Residents

Table 1.4-1 Objective for ambient air protection:

(2) Objective for environment water protection: The Project discharge outlet lies on Meihua River. According to Division of Guangdong Water Environmental Function Areas, 6km Section from SGIS discharge outlet to downstream Longgang (Estuary) of Meihua River and 4km Section from Longgang to Baitu (Estuary) of Maba River shall comply with Grade IV Standard in Environmental Quality Standards for Surface Water (GB3838-2002), and so do Baitu Section of Beijiang River. Water environment quality around the plant is not affected obviously. For regionalizing of water environment function and implementing standards in the assessed region, see details in Table 1.4-2.

Objective Position Distance (m) Water Environment Function Zone

Meihua River (upstream) Huangsha Pit to SGIS discharge port, 14km IIIGrade Meihua River (downstream) SGIS discharge port to downstream Longgang Grade IV



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(Estuary) of Meihua River: 6km Maba River (upstream) Huangmao to Shaoguan Longgang: 42km Grade

Maba River (downstream) Longgang to Baitu (Estuary): 4km Grade IV Beijiang River (Baitu

Section) Shazhouwu to Baisha: 30km Grade IV

Table 1.4-2 Regionalizing of water environment function and implementing standards in the assessed region

(3) Acoustic environment: Near the boundary of this Project are Gas Tank Area, Steel-making Plant and Power Plant. There are some residents scattered in Shanzibei Village in the northwest outside this Plant. There are no provisions about division of acoustic function areas in the assessed region currently. According to standards specified in Environmental Impact Assessment Report on Technical Reformation Project of Slab Continuous Caster and Medium Plate Mill in Guangdong SGIS Songshan Co., Ltd. replied by Guangdong Environmental Protection Bureau, the implementing standards for acoustic environment in this project are shown in detail in Table 1.4-3.

Objective Position Distance (m) Acoustic Environment Function Zone Shanbeizi Village Northwest, 400m away from the north plant boundary Grade 1 SGIS Living Area East and West Residential Area Grade 2 SGIS Plant Region Plant Region: 8.3 km2 Grade 3

Table 1.4-3 Regionalizing of acoustic environment function and implementing standards in the assessed region

1.5 Assessment Grades and Points

1.5.1 Assessment Grades Upon request by the Technical Guidance for Environmental Impact Assessment, based on the characteristics of the project and environmental features, the grades for this assessment are determined as: (1) Assessment of atmospheric environment impact The grading for the assessment of atmospheric environment impact is determined by selecting 1-3 major contaminants based on factors such as the amount of major contaminants release, complexity degree of the surrounding terrain and the local quality standard of atmospheric environment to be implemented etc. to calculate the equivalent standard release. According to engineering analysis of the Project, after it is put into operation, fugitive emission will be the main type under normal working conditions. Air pollutants (mainly CO) emissions are as follows:

QCO＝15.86kg/h

The formula for equivalent standard release in the Technical Guidance for Environmental Impact Assessment:

Pi=(Qi／C0i)×109

wherein, Pi is the equivalent standard release (m3/h); Qi—emission in unit time (t/h) C0i—Ambient Air Quality Standard (mg/m3) Therefore, the equivalent emission amount of CO should be: Pdust=0.5×107 m3/h. As surrounding geography of the Project is characterized by valley plain and hills, in accordance with specifications of Technical Guidelines for Environmental Impact Assessment and considering that the surrounding environment of the Project is relatively sensitive, the assessment work shall be specified as Level 3 assessment.



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(2) Assessment of the impact on surface water Upon request by the Guidance, the impact on surface water is graded in accordance with the emission of polluted water, the complexity degree of the water-quality of the polluted water, the size of the water areas included, and the requirements on water-quality. In this Project, the sewage firstly goes to Meihua River (downstream), a small river. The water quality requirement for Meihua River (downstream) is Class IV. Wastewater produced in the Project is nearly recycled completely. As the categories of pollutants in wastewater are small and simple, only a qualitative analysis is needed. (3) Water environment impact assessment The project is located within the factory, which is categorized as type 3 in acoustic function, but because the factory boundary is close to the Old Xiaojiang Village, the impact on the acoustic environment should be graded as grade 2, in accordance with the relevant prescriptions in the Technical Guidance for Environmental Impact Assessment-Acoustic Environment. (4) Assessment of ecological environment impact In the assessed area of discharge outlet in the Plant site, there do not exist any Class I and Class II animals and Plants under protection, and there do not exist any rare and endangered aquatic wildlife either in neighboring surface water. Considering the project involves a slight amount of wastewater release, and is carried out within the factory, so the ecological environment is evaluated as general.

1.5.2 Assessment Points Special topics such as project summary and engineering analysis, environmental summary, monitoring and assessment of the current condition of the environmental quality, analysis of the environmental impact during the operation period, analysis of the impact on environmental risks during the operation period, the verification of the technical feasibility of environmental protection measures, and public participation etc. This Assessment focuses on research and assessment on existing baseline of atmospheric environment, monitoring and analysis of existing baseline of engineering pollution sources, as well as analysis and assessment of implementing effects of environmental protection measures.

1.6 Assessment Scope and Assessment Factor 1.6.1 Water Environment Upon request by the Technical Guidance for Environmental Impact Assessment, we develop the scope and factor of the assessment of the environmental impact of this project. Based on the wastewater discharge characteristics of the project, the assessment scope of this project shall be decided as below: The river reach from the discharge outlet of Meihua River to the confluence of Meihua River and Maba River as well as the place where Maba River joins into the North River, with the total length reaching about 10 km; Factors for existing baseline assessment: pH, SS, sulphide, volatile hydroxybenzene, arsenic, water temperature, lead, cadmium, copper, zinc, mercury, petroleum, fluoride, cyanide, CODcr, BOD5, non-organic nitrogen, non-organic phosphor and Fe (20 factors in total). Prediction factors: CODcr and petroleum-related substances

1.6.2 Atmospheric Environment According to the request by the Technical Guidance for Environmental Impact Assessment, the release condition of Air Pollutants and the characteristics of the regional environment, the scope and factor of the assessment of the atmospheric impact in this project are determined. Assessment scope: according to the project scale, pollution discharge characteristics and situation of surrounding environment, the assessment scope of this project shall be fixed on such a rectangular area



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which centers on the plant location and extends along the prevailing wind direction, with its side length being 10 km. Factors of existing baseline assessment: SO2, NO2, PM10, TSP Factors for prediction assessment: CO

1.6.3 Acoustic Environment

According to the condition of the surrounding environment, the scope for acoustic environment assessment is the area within the factory boundary in which there are noise sensitive points. The assessment factor is equivalent consecutive grade A.

1.6.4 Ecological Environment and Other

The factors for evaluating the existing baseline of land quality are: Copper, lead, zinc, cadmium, mercury and arsenic. Ecological Environment: Animal and plant breeds, biomass, and dominant species etc. The assessment of the impact of solid wastes on the environment involves the analysis of the toxicity of the solid wastes, the authentication of the characteristics and types of the solid wastes, the analysis of the measures of comprehensively utilizing or disposing solid wastes, of the possible impacts of the solid wastes on water bodies, the atmosphere, the land, underground water and ecology etc., and the feasibility of the pollution preventing and treating measures taken.

1.7 Assessment Standards

1.7.1 Standards for Environment Quality

(1) Ambient Air Quality Standard (GB3095-96, modified in Jan., 2000); Class III standard is adopted within the factory, and Class II standard is adopted outside of the factory.

Pollutants Assessment Standards Average value in 1 hour Day average

Value of Class III Standard (mg/m3) / 0.15 Absorbable particles Value of Class II Standard (mg/m3) / 0.25

Value of Class III Standard (mg/m3) / 0.3 TSP: Value of Class II Standard (mg/m3) / 0.5 Value of Class III Standard (mg/m3) 10 4 CO Value of Class II Standard (mg/m3) 20 6 Value of Class III Standard (mg/m3) 0.5 0.15 Sulfur

dioxide Value of Class II Standard (mg/m3) 0.7 0.25 Value of Class III Standard (mg/m3) 0.24 0.12 Nitrogen

dioxide Value of Class II Standard (mg/m3) 0.24 0.12

Table 1.7-1 Ambient Air Quality Standards (2) Implement the corresponding standards of the Environmental Quality Standard for Surface Water(GB3838-2002) according to the Water Function Planning of Guangdong Province, i.e. the Class III standard is implemented for the upstream of Meihua River (from Huangsh Pit to the discharge outlet of SGIS, 14km); on Meihua River, the Class IV standard is implemented for the 6km segment from the discharge outlet of SGIS to Longgang downstream (estuary), and on Maba River, the Class IV standard is implemented for the 4km segment from Longgang to Baitu (estuary); the Class II standard is implemented for downstream Maba River (Huangmao to Shaoguan and Longgang, 42km), and the Class IV standard is



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implemented for the Baitu segment of Beijiang River.

Items Class I Class II Class III Class IV Class V PH value (no dimension) 6 - 9

Water temperature Artificial variations of environment water temperature should be limited as: Maximum temperature rise in week average ≤1

Chemical oxygen demand (COD)≤ 15 15 20 30 40

biochemical oxygen demand after 5 days

(BOD5) (BOD5)≤

3 3 4 6 10

Copper≤ 0.01 1.0 1.0 1.0 1.0 Arsenic≤ 0.05 0.05 0.05 0.1 0.1 Mercury≤ 0.00005 0.00005 0.0001 0.001 0.001

Chrome (hexavalence) ≤ 0.01 0.05 0.05 0.05 0.1 Lead≤ 0.01 0.01 0.05 0.05 0.1

cyanide≤ 0.005 0.05 0.2 0.2 0.2 Volatile hydroxybenzene≤ 0.002 0.002 0.005 0.01 0.1

Petroleum≤ 0.05 0.05 0.05 0.5 1.0 Sulphide≤ 0.05 0.1 0.2 0.5 1.0 Fluoride≤ 1.0 1.0 1.0 1.5 1.5

Total nitrogen≤ 0.2 0.5 1.0 1.5 2.0 Total phosphor≤ 0.02 0.1 0.2 0.3 0.4

Zinc≤ 0.05 1.0 1.0 2.0 2.0

Cadmium≤ 0.001 0.005 0.005 0.005 0.01 Iron≤ 0.3

Table 1.7-2 Environmental Quality Standards for Surface Water (3) Upon request by the Ambient Noise Standard for Urban Area (GB3093-93), Yangwu Village, Dayuantou Village, Shanzibei School, Xiaogang Village and Xiaojiang Village, which are noise sensitive, are rural environments, the Class I standard in the Ambient Noise Standard for Urban Area (GB3093-93) is implemented; as Old Xiaojiang Village is within the 300m radius of the boundary of SGIS, the Class II standard in the Ambient Noise Standard for Urban Area (GB3093-93) is implemented; the factory is an industrial area, the Class III standard in the Ambient Noise Standard for Urban Area (GB3093-93) is implemented.

Daytime Nighttime Class I Standard 55 45 Class II Standard 60 50 Class III Standard 65 55

Table 1.7-4 Environmental Quality Standards for Noise (4) The Class II standard in the Environmental Quality Standard for Soils (GB15618-1995).

Copper Lead Zinc Cadmium Mercury Arsenic Class II standard, Environmental Quality Standard for Soils 50 250 200 0.3 0.3 30

Table 1.7-5 Environmental Quality Standard for Soils

1.7.2 Emission Standards (1) Guangdong Emission Limits for the Air Pollutants (DB4427-2001): Class II standard, phase 2;



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Items CO Particles NOx SO2 DB44/27-2001 phase 2 1000 120 120 500

Table 1.7-6 Emission standards for Air Pollutants (3) Guangdong Discharge Limits for Water Pollutants (DB4426-2001): Class II standard, phase 2;

Items CODcr Petroleum DB44/26-2001 Class II standard, phase 2 110 8.0

Table 1.7-7 Emission standard for water pollutants (5) Standard of Noise at Boundary of Industrial Enterprises (GB12348-90);

Items Daytime Nighttime Class III standard, (GB12348-90) 65 55

Table 1.7-8 Standards of Noise at Enterprise Boundary (6) Noise Limits for Construction Sites (GB12526-96).

Noise limitation Construction phase Main sources of noise Daytime Nighttime Earthwork Bulldozers, excavators and loaders etc. 75 55

Piling All kinds of pile drivers etc. 85 Construction prohibited

Structure Concrete, mixers, stirring sticks, electric saws etc. 70 55

Decoration Hoists, elevators etc. 65 55

Table 1.7-9 Noise Limits for Construction Site



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2 Project Profile

2.1 Name, Nature and Investment of the Project (1) Project Name: Gas Tank Project of Guangdong SGIS Songshan Co., Ltd. (2) Construction Nature: New (3) Construction Entity: Guangdong SGIS Songshan Co., Ltd. (4) Project Investment: the total investment is 344.520 million RMB. It belongs to static investment and

shall not include the land-expropriation expense, foundation treatment expense, land leveling expense and facilities relocation expense. The loan and the owner will share the investment equally.

2.2 Construction Scale, Location and Labor Requirement of (1) Construction Scale This project needs to build one 300,000m3 blast furnace gas tank, one 100,000m3 industrial coke oven gas tank, one 300,000m3 civil coke oven gas tank and two 80,000m3 converter gas tank.

(2) Project Location According to the general layout of SGIS, this Project shall be located on the north part of the company’s production area, with the rechanneled Meihua River on its north, the existing gas tank area on its west, the electric blast station of No.6 blast furnace on its south, and the farm land and fish farm on its east. See Diagram 2.1-1

(3) Location Outline The tank region will cover an area of 72,600 m2; see Table 2.2-1 for more information.

Land occupying type Properties of land occupied Permanent Temporary Name of project area Farmland Fish

pond Forest land

Wild grass land

Total Land occupying

Land occupying

Plant area 36.00 / 42.20 22.20 100.40 100.40 / Side slope area

outside the plant 1.20 / 2.50 1.60 5.30 5.30 /

Temporary building area for construction 0.80 / 1.30 1.20 3.30 1.10 2.20

Total / 106.80 2.20

Table 2.2-1 Statistics of Project-Occupied Land (Mu)



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Fig 2.2-1 Location of the new gas tank



14

2.3 Main Construction Content of Project

2.3.1 Project Setup See Table 2.3-1 for the Project composition. See Table 2.3-2 for the design parameter of each gas tank.

One 300,000 m3 blast furnace gas tank

Apply new dry-type gas tank (POC type), mainly including piston sealing device, sealing oil supply system, anti-rotating device, first aid devices, emergency dispersing pipe (6×DN150), safe dispersing pipe (1×DN1400), internal elevator, rotating platform and nitrogen pipe.

One 100,000 m3 industrial coke oven gas tank

Apply new dry-type gas tank (POC type), mainly including piston sealing device, sealing oil supply system, anti-rotating device, first aid devices, emergency dispersing pipe (6×DN150), safe dispersing pipe (1×DN1400), internal elevator, rotating platform, inner capacity indicator and nitrogen pipe.

One 100,000 m3 industrial coke oven gas tank

Apply new dry-type gas tank (POC type), mainly including piston sealing device, sealing oil supply system, anti-rotating device, first aid devices, emergency dispersing pipe (6×DN150), safe dispersing pipe (1×DN1400), internal elevator, rotating platform, inner capacity indicator and nitrogen pipe.

The principal part

Two 80,000 m3 converter gas tanks

Apply piston robber diaphragm sealing (PRC type) dry-type gas tank (Wilkins gas tank), mainly including piston system, rubber diaphragm sealing, levelling device, volume indicator, nitrogen pipe and dispersing pipe.

Converter gas

Content of gas for external supply in the adequately mixed converter gas is about 100mg/m3. There are 3 wet horizontal plate explosion-proof electrostatic precipitators, 2 for service and 1 for standby. Gas

purification

Coke Oven Gas

Purification of 7,000Nm3/h industrial coke oven gas and 3000Nm3/h civil coke oven gasApply all-dry purification process which can eliminate H2S together with impurities such as naphthalin, NH3, HCN and so on in the coke oven gas so as to obtain qualified purified gas.

Blast furnace gas tank

There are 6 oil pump stations.Each oil pump station is arranged with two oil pumps for standby use mutually. Only one oil pump is under operation in normal conditions. There are 6 spare oil tanks with total capacity of about 12m3.

Industrial coke oven gas tank

There are 4 oil pump stations.Each oil pump station is arranged with two oil pumps for standby use mutually.Only one oil pump is under operation in normal conditions.There are 4 spare oil tanks with total capacity of about 8m3.

Sealing oil supply

Civil coke oven gas tank

There are 2 oil pump stations.Each oil pump station is arranged with two oil pumps for standby use mutually.Only one oil pump is under operation in normal conditions.There are 2 spare oil tanks with total capacity of about 4m3 which can maintain normal operation of gas tank in case of power failure for more than 10 hours.



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Converter gas

There are 3 centrifugal fans (2 for service and 1 for standby) arranged on the platform with main span of +3.5m together with the mixed gas compressor in this station. In addition, there is a 10t explosion-proof crane arranged in the station.The matching motors control the rotating speeds of fans by means of frequency conversion.

Mixed Gas & Converter Gas Pressurization

station

Mixed gas

There are 6 centrifugal fans (4 for service and 2 for standby) arranged on the platform with main span of +3.5m together with the converter gas compressor in the mixed gas and converter gas booster stations.The matching motors control the rotating speeds of fans by means of frequency conversion.

Industrial coke oven

gas

There are 4 piston type compressors (3 for service and 2 for standby) arranged on the ground with main span of ±0m in this station together with the gas fan of civil coke oven. In addition, there is a 10t explosion-proof crane arranged.There is one 20m3 buffer tank arranged on the main pipe of compressor inlet. Each compressor outlet is arranged with one 2m3 buffer tank, and the external supply main pipe is arranged with two 100m3 vertical type storage tanks for peak regulation.

Booster system

Coke Oven Gas Pressurization

station

Civil coke oven gas

There are 3 centrifugal fans arranged on the platform with main span of +3.5m in this station together with the gas compressor of industrial coke oven.The matching motor for the compressor applies frequency conversion control.

Gas Mixture

After the blast furnace gas (~9.5kPa, 200000Nm3/h) and coke oven gas (~6kPa, 80000Nm3/h) of gas main pipe are mixed to form gas mixture from blast furnace and coke oven (~4kPa, 280000Nm3/h, 7527kJ/Nm3), the mixture will enter mixed gas compression system and be pressurized to 18kPa.The pressurized gas mixture from blast furnace and coke oven will mix with the pressurized converter gas (~19kPa, 40000~75000Nm3/h, 7527kJ/Nm3) and form gas mixture from blast furnace, coke furnace and converter (~16kPa, 320000~355000Nm3/h, 7527kJ/Nm3) which will be supplied for all mixed gas users in the plant.

Cooling

When the TRT is running, the temperature of blast furnace gas is ~80; when the TRT not running, the temperature is 150~250.In order to ensure the safety of blast furnace gas tank and the stable performance of mixed gas blower, the temperature of the gas entering the tank and the mixed gas blower shall be kept less than 60. Therefore, there shall be arranged two sets of blast furnace gas cooling systems, with one set for the blast furnace tank, the other for the mixed gas system.

Power Supply and Distribution

The independent double-circuit 10kV exterior power supply shall be provided by the SGIS, with the power connection point arranged on the receiving end of the high-voltage incoming cabinet. Powered voltage: AC 10kV

Public construction:

Telecommunication system

Communication system, industrial television system and automatic fire alarm system



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Water supply and drainage

Water supply pressure at the fire water connection is about 0.25MPa. The pipe diameter is equal to DN250. There is a ring pipe network arranged which is connected with service pipes for production – fire in SGIS. Pipe networks in the whole factory include clean circulating water system, production – fire water supply system, drainage system for production wastewater and storm water.

Thermal facilities Mainly including steam and compressed air pipelines in the gas tank area.

Ventilation and Air Conditioning

Explosion-proof axial flow fan or axial flow explosion-proof roof fan is set for ventilation and air change. LFDNH air cooling electro-thermal air conditioner or KFR wall-type air conditioner is installed in accordance with the requirement. Phenol containing wastewater

Collected and treated by Phenol-Cyanogen Wastewater Treatment Station of the coking plant and used as the supplement of blast furnace slag flushing water

Oily wastewater


Naphthalin containing wastewater


Dusty wastewater

Collected and treated by the wastewater treatment plant of No.3 Steel Plant prior to reuse in the turbid circulating water system

Wastewater treatment

Domestic wastewater


Noise Pumps with low noise are selected for reduction of noise. The pumps are arranged reasonably on the plane.

Environmental Protecti

on Project

Afforesting The afforesting rate is 25% with a coverage of 18,200m3.

Table 2.3-1 Project Setup No.: Items Unit Blast furnace gas tank Industrial

coke oven gas tank


Converter gas tank

1 Type of gas tank New dry type gas tank (POC) Piston robber diaphragm sealing dry-type gas tank

2 Gas storage capacity

m3 300,000 100,000 30000 80000

3 Pressure of stored gas

Pa 9500±200 6000±200 3000±200 2500~3000

4 Pressure fluctuation Pa ±200 ±200 ±200

5 Outline Cylinder type Cylinder type Cylinder type Circular 6 Internal diameter

of the gas tank m 64.6 46.9 29.07 58

4 Total height of the lateral plate

m 107.2 70.55 54.75 ~39

5 Total height of the gas tank

m ~121 ~82.3 ~64.1 ~50

6 Storage medium Pa Blast furnace gas Coke Oven Coke Oven Gas Converter gas



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Gas

7 Temperature of the stored gas 0~55 0~55 0~55 0~72

8 Humidity of the gas Pa Saturation Saturation Saturation Saturation

9 Dust concentration mg/ m3 ≤10 ≤10 ≤10

10 Gas input m3/h 200,000 70,000

11 Gas output m3/h 380,000 125,000 10,000

(throughput)

Normal: 0~150000 Maximum: 300,000

(throughput)

Table 2.3-2 Design Parameter of Each Gas Tank See Table 2.3-3a for the main equipments of each gas tank. The converter gas process shall adopt the piston rubber sealed (PRC type) dry gas tank (hereinafter called “Wiggins Tank”), which is different from the new dry gas tank (POC) used by others. See Table 2.3-3b for its main equipments.

No.: Main equipment Unit Blast furnace gas tank



1 Quantity of vertical columns Piece 32 24 16 2 Cloisters (including those on

the top of gas tanks) Layer 8 6 4

3 Piston stroke m 91.6 57.885 45.2 4 sealing element Set 1 1 1 5 Oil pump station Set 6 4 2 6 Spare oil tank Piece 6 4 2 7 First aid device Set 1 1 1 8 Inner capacity indicator

(mechanical type) Set 1 1 1

9 Radar tank level indicator Set 1 1 1 10 Explosion-proof industrial

television system Set 1 1 1

11 CO analyzing and inspecting device

Set 1 1 1

12 Safe dispersing pipe Piece 1 1 1 13 Emergency dispersing pipe Piece 8 4 2 14 Replacement dispersing pipe Piece 6 4 2

Table 2.3-3a Main Equipments of Blast Furnace Gas Tank and Coke Oven Gas Tank Name Quantity Parameters

1 Gas tank and appendixes

1 set

1) Tank bottom plate, bottom plate drainage device: 1 set 2) Piston system (piston plate, pillar, piston baffle and appendix): 1 set 3) Roof system (roof plate, roof beam, roof outer annual plate, etc.): 1

set 4) Gas tank (vertical column, lateral plate and circular beam) and gas

tank accessories: 1 set 5) T baffle (T baffle support and T baffle stage): 1 set 6) Sealing device: 1 set 7) Levelling device: 1 set 8) Capacity indicator: rope-type site capacity indicator, ultrasonic tank

level, one for each 9) Dispersing pipe, nitrogen pipe, water supply & drainage pipes and

accessories: 1 set 10) Electrical system and instrument system: 1 set



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2 Gas tank area

Table 2.3-3b Main Process Equipments of 800,000m3 Converter Gas Tank (Single Seat) and Auxiliary Facilities

2.3.2 Auxiliary parts 2.3.2.1 Imported Equipments The gas compression and mixture shall be done and supplied collectively by the plant, which is related to the stability of whole gas users of the plant; while the purified and compressed civil coke oven gas is related to the living of the whole residents within the SGIS area. Therefore, the converter gas pressurizer, mixed gas pressurizer, civil coke oven gas pressurizer and their accessory equipments shall be provided through import. The imported equipments are as follows: a Mixed gas pressurizer (including the auxiliary electric engine and local control cabinet): 3 pieces per

set; b Converter gas pressurizer (including the auxiliary electric engine and local control cabinet): 6 pieces

per set; c Converter gas pressurizer (including the auxiliary electric engine and local control cabinet): 3 pieces

per set;

2.3.2.2 Purification of Coke Oven Gas The out-supplied coke oven gas contains much tar, H2S and other impurities, and can not meet the requirements for cutting and civil use; therefore, the industrial coke oven gas purification facility and the civil coke oven gas purification facility shall be provided, one set for each type. The industrial coke oven gas purification device shall possess a capacity of 7000Nm3/h and the civil coke oven gas purification device 3000Nm3/h. Both shall adopt the full dry purification process, wherein the naphthalene, NH3, HCN and other impurities shall be completely removed out of the coke oven gas together with the H2S.

No.: Name Quantity Industrial coke oven gas purification device

Civil coke oven gas purification device

1 Complete set of purification device 1 set

1) Naphthalin removal tower: 2 sets, DN3400*17000, 16MnR

2) Desulfurization Tower: 2 sets, DN3000*15000, Q235-B

3) Electric heater 4) Auxiliary facilities

1) Naphthalin removal tower: 2 sets, DN3400*17000, 16MnR

2) Desulfurization Tower: 2 sets, DN3000*15000, Q235-B

3) Electric heater; 4) Auxiliary facilities

2 Gas pipeline facilities

Electric metal rigid sealing butterfly valve, electric sector blind plate valve and metal bellow compensator.

Table 2.3-4a Main Process Equipments for Coke Oven Gas Purification

No.: Name Specifications Usage Weight (ton) 1 Ceramic ball

filling material

Φ20-50 spherical, white

Gas distribution

2 CAN-110 10-50mm indefinite form,

black

Removal of naphthalin, tar and sulphur

3 CAN-229 Φ3-4×5-15 black Removal of naphthalin, tar and sulphur

Industrial purification: 90t Civil purification: 45t

Make replacement once every two years

4 Desulfurizer Industrial purification: 50t



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No.: Name Specifications Usage Weight (ton) Civil purification: 30t

Make replacement once every two years

Table 2.3-4b Filling List of Purification Device 2.3.2.3 Converter Gas Dedusting

When the converter gas is fully mixed in the gas tank，the out-supplied gas has a dust content of about 100mg/m3, and needs to be dedusted further. Three wet plate horizontal, explosion-proof, electrostatic dust collectors shall be provided, with two for duty and one of them set aside for standby; the process equipments shall be arranged outdoors, but the electric control device indoors. See Table 2.3-5 for the main design parameters.

No.: Items Unit Parameters 1 Design conditions

Working medium Converter gas Medium pressure kPa 2.5~3.0 Medium temperature 0~72 Medium humidity Saturation Medium flow Nm3/h 37500 Inlet dust content mg/ m3 ≤150, for a short time ~200 Dust content at outlet mg/ m3 ≤10 Mechanical water at outlet g/m3 ≤10 Device resistance damage Pa ≤500

2 Parameters of the dust separator (single)

3 sets (2 sets for service and 1set for standby)

Specifications and type Wet plate explosion-proof type

Pressure resistance of the device kPa 5

Explosion venting pressure kPa 4.6

Ash removal Ash removal type: Spraying

Spraying water pressure: 0.35MPa (at the nozzle) Level detection of the ash bucket: 1 set

Nitrogen replacement Pressure: 0.3~0.6MPa, purity: 99.9%, flow: 450m3 each time

Total installed power KW 210 Actual power consumption KW 140

Table 2.3-5 Main Electric Dedusting Technical Parameters of Converter Gas After entering the electric field of the electrostatic dust collector, the gas will be evenly distributed by the air flow distribution plate; the electric field shall adopt the negative electrode as the corona electrode. When the gas flows through the electric field which is supplied with high voltage, the solid dust will be negatively charged and flow to the positive electrode; and then the dust attached on the dust collecting plate will be sprayed out of the electric dust collector. The insulator compartment shall be sealed by nitrogen to prevent the gas leakage, and equipped with the electric heater to prevent the insulator from being damaged by the condensed vapor. The shell shall be provided with the auto-reset explosion valve to release the pressure timely in case of gas explosion accident; the rectifier shall be adjustable and can automatically reduce the voltage to the safe level in case the oxygen content of converter gas exceeds the rated value. 2.3.2.4 Gas Pressurization station (1) Mixed Gas & Converter Gas Pressurization station The converter gas pressurizer and the mixed gas pressurizer shall be arranged together on the platform of mixed gas & converter gas pressurization station whose main span is +3.5m, with the 10t electric



20

explosion-proof crane equipped inside the station. Converter Gas Pressurization The dedusted converter gas has a pressure of 2~2.5kPa, and shall be pressurized to proceed to the gas mixture. This system shall be equipped with three centrifugal blowers, two for duty and one of them for standby; the rotating speed of the blowers shall be controlled by the auxiliary electric engine of the pressurizer through the frequency conversion. The converter gas pressurizer relates to the converter gas usage of the whole plant and influences the mixed gas users of the whole plant, therefore, in order to ensure the system stability, the main equipment of the gas pressurizer shall be considered to be supplied through import for the present.

Name Converter Gas Pressurization Converter Gas Pressurization 1

Compressor

Converter gas

compressors: 3 sets

1) Centrifugal fan (introduced) 2) Matching motor (introduced) 3) Local control cabinet (introduced) 4)Auxiliary facilities

Mixed gas compressors: 5 sets

1) Centrifugal fan (introduced) 2) Matching motor (introduced) 3) Local control cabinet (introduced) 4)Auxiliary facilities

2 Electric crane 1 set, 10t, suspended type, explosion-proof

3 Gas pipeline facilities 4 Interlocking

mechanism a) The gas compressor will stop running and can not be started if the converter gas tank piston is located at a very low position. b) If oxygen content in gas in the outlet pipeline of gas tank exceeds 1%, the electric precipitator will stop running, the inlet valve of electric precipitator shall be cut off and the gas compressor will stop running. c) Flow regulation via frequency conversion d) Stabilize the pressure of off-site coal supply by regulating the backflow

Table 2.3-6 Main Process Equipments of Mixed Gas & Converter Gas Pressurization station

Mixed Gas Pressurization The gas mixture from blast furnace and coke oven with pressure of ~4kPa, cannot serve the mixed gas users within the plant until it is pressured to 18kPa and mixed with converter gas and form gas mixture from blast furnace, coke oven and converter . This system shall be equipped with six centrifugal blowers, four for duty and two for standby; See Table 2.3-6 for the main process equipments for the mixed gas pressurization

(2) Coke Oven Gas Pressurization station The industrial coke oven gas compressor and the civil coke oven gas blower shall be arranged together on the main span of the coke oven gas pressurization station, ±0m from the ground, with the 10t electric explosion-proof crane equipped inside the station. Industrial Coke Oven Gas Pressurization The purified industrial coke oven gas shall mainly be used for the cutting process of the 3×150t converter billet as well as the auxiliary RH, and included in the existing pipe network system of the coke oven gas for cutting use. After the purification, such gas has a pressure of~3kPa which is less than the needed 0.8MPa, and therefore shall be pressurized before supplied to the users. This system is planned to be provided with 4 piston compressors, three for duty and two for standby. For the main process equipments of the industrial coke oven gas pressurization, pleas see Table 2.3-7a.

Industrial coke oven gas compressor Civil coke oven gas compressor Quantity Parameters for each set Quantity Parameters for each set



21

Industrial coke oven gas compressor Civil coke oven gas compressor Quantity Parameters for each set Quantity Parameters for each set

5 sets

1) The body 2) Matching motors 3) Intercooler, after-cooler 4) Local control cabinet 5) Auxiliary facilities

3 sets

1) The body (introduced) 2) Matching motors (introduced) 3) Local control cabinet (introduced) 4)Auxiliary facilities

Electric crane 1 set,10t, suspended type, explosion-proof Table 2.3-7a Main Process Equipments of Industrial Coke Oven Gas Purification

Civil Coke Oven Gas Pressurization The gas from 30,000m3 civil coke oven gas tank has a pressure of 3kPa and it must be pressured to 20kPa before being supplied to the civil users. This system shall temporarily be planned to be provided with three centrifugal blowers, the rotating speed of which shall be controlled by the auxiliary electric engine of the pressurizer through the frequency conversion The civil coke oven gas pressurizer relates to the whole living users within the SGIS area, in order to ensure the system stability, the main equipment of the gas pressurizer shall be considered to be supplied through import for the present.

No.: Name Quantity Parameters for each set

1 Civil coke oven gas compressor 3 set

1) Centrifugal fan (introduced) 2) Matching motor (introduced) 3) Local control cabinet (introduced) 4) Auxiliary facilities

2 Gas pipeline facilities Electric metal rigid sealing butterfly valve 3 set DN400 PN0.25MPa Electric metal rigid sealing butterfly valve 4 set DN350 PN0.25MPa Electric metal rigid sealing butterfly valve 1 set DN1200 PN0.25MPa Electric sector blind plate valve 1 set DN700 PN0.05MPa Electric actuated gate valve 1 set DN200 PN1.6MPa

Metal bellow compensator 1 set DN400/DN350/DN200/DN700 PN0.1MPa

Table 2.3-7b Main Process Equipments for Civil Coke Oven Gas Pressurization 2.3.4.5 Gas Mixture

The blast furnace gas (~9.5kPa, 200000Nm3/h) and the coke oven gas (~6kPa、80000Nm3/h) from the gas main pipe of the tank area shall, based on the flow proportion and heating value feedback, be mixed together to form gas mixture from blast furnace and coke oven (~4kPa,280000Nm3/h, 7527kJ/Nm3), and then delivered to the mixed gas pressurization station to has its pressure increased to 18kPa. The pressurized gas mixture from blast furnace and coke oven shall, based on the flow proportion and heating value feedback, be mixed together with the converter gas (~19kPa, 40000~75000Nm3/h, 7527kJ/Nm3) to form the gas mixture from blast furnace, coke oven and converter, and then supplied to the whole mixed gas users of the plant.

No.: Name Quantity Parameters for each set 1 Blast furnace and coke oven

Electric metal rigid sealing butterfly valve 2 sets DN1600 PN0.25MPa

Electric sector blind plate valve 2 sets DN1600 PN0.25MPa

Gas mixer 1 set DN3000 2 Blast furnace, coke oven and converter

Electric metal rigid sealing butterfly valve 3 sets DN1600 PN0.25MPa

Electric sector blind plate valve 2 sets DN1600 PN0.25MPa

Close type electric blind plate valve 1 set DN2800 PN0.05MPa



22

No.: Name Quantity Parameters for each set 3 Metal bellow compensator 1 set PN0.1MPa

Table 2.3-8 Main Process Equipments of Gas Mixture System 2.3.4.6 Blast furnace Gas Cooling System When the TRT is running, the temperature of blast furnace gas is ~80; when the TRT not running, the temperature is 150~250. In order to ensure the safety of blast furnace gas tank and the stable performance of mixed gas blower, the temperature of the gas entering the tank and the mixed gas blower shall be kept less than 60. There are two blast furnace gas cooling systems of which one is used for blast furnace gas tank and the other is used for mixed gas system. The blast furnace gas cooling system shall be the wet spay cooling system. The cooling water will bring partial dust from the blast furnace when contacting with the gas (dust content of the blast furnace gas in the tank area is lower than 10mg/m3), and is cooled in the cooling tower prior to recycle. Wastewater will be generated from the cooling tower, the main pollution factor is SS, which could be discharged directly to the clean sewage system due to a little amount.

Items Service objectives Parameters for each set System I Blast furnace gas tank 1. Fore-end temperature of blast

furnace gas: 80-150-200 2. In-tank temperature of blast furnace gas: 80 3. Flux of blast furnace gas (intake-amount): 200000Nm3/h 4. Cooling spray water amount: 100t/h 5. Water supply pressure: 0.6MPa 6. Water supply temperature: 35

7. Water drainage temperature: 45 System II Blast furnace coke gas mixing system 1. Fore-end temperature of blast

furnace gas: 80-150-200 2. In-tank temperature of blast furnace gas: 60 3. Flux of blast furnace gas (intake-amount): 200000Nm3/h 4. Cooling spray water amount: 100t/h 5. Water supply pressure: 0.6MPa 6. Water supply temperature: 35

7. Water drainage temperature: 45

Table 2.3-9 Parameters for Blast Furnace Gas Cooling

2.3.3 Public construction: 2.3.3.1 Water supplying and draining system (1) Water Source Water required for this Project shall be supplied by the water pipe network of the plant.

(2) Water Supply System The fire-fighting water supply points in the tank area shall have a water pressure of 0.25MPa, with the pipe diameter being DN250. A circular pipe network shall be arranged in the tank area and connected with the production-fire fighting water supply network of the plant. The water supply system shall include: the clean circulating water system, production-fire fighting water supply system and domestic water system.



23

1) Clean Circulating Water System This system is mainly to supply the water required by the pressurization station and the gas cooling system: The cooling water required by the mixed gas & converter gas pressurization station and the coke oven gas pressurization station; the quantity of water consumption Q=140m3/h. The water used by the users will have its temperature increased but not be polluted, and shall directly be pumped onto the cooling tower by the residue pressure. The backwater of the gas cooling system water will automatically flow to the hot water pool (the quantity of water consumption Q=200m3/h), and shall be lifted by the water pump onto the cooling tower, and then such cooled water shall be pressurized by the pumping set and supplied to the users for recycling use. 2) Water supplying system for production and firefighting This system is mainly to supply the production and fire-fighting water to each gas tank. In order to ensure the supply of production and fire-fighting water, this system shall be provided with a circular pipe network which has two intake pipes connected with the production-fire fighting water supply network of the plant. 3) Domestic Water Supply System The domestic water required by this Project shall mainly be supplied by domestic water pipe network of the SGIS area.

(3) Water Supply System 1) Production Wastewater Discharge The production wastewater mainly includes the wastewater discharged from the blast furnace gas tank, the coke oven gas tank, the drainer of tank area, the Wiggins converter gas tank, the electric dedusting device of converter gas and the purification station of coke oven gas. See Table 2.3-10 for the discharge method.

Uncontaminated Contaminated Source Source Drainage mode Source Drainage mode


Drainage from the gas tank pipe water-seal

Water is uncontaminated, drained to the clean sewage system and will be reused.

Separate drainage at oil pump station, condensate drainage and drainage from the water seal at the tank bottom plate, and drainage from the oil gallery flushing at the gas tank base.

With chemical pollutants like oil, sulphur and chlorine etc., the water can not be directly discharged. Thus, it shall firstly be discharged into the water collection pond and then sent to the wastewater treatment plant of the coking plant for treatment.

Coke oven gas tank

With little phenol, the production drainage can not be directly drained out. Thus, it shall firstly be discharged into the water collection pond and then be sent to the wastewater treatment plant of the coking plant for treatment.

Drainer in gas tank area

With little phenol, the production drainage can not be directly drained out. Thus, it shall firstly be discharged into the water collection pond and then be sent to the wastewater treatment plant of the coking plant for treatment.

Wilkins converter gas tank

, Due to the little ash content and no chemical pollutant included, water-seal drainage and ash removal drainage at the bottom can be directly discharged into the clean sewage system in the plant for recycling.

Electric precipitation for converter gas

For contaminated, the water shall firstly be discharged into the water collection pond and then be sent by means of the self-priming pump to the wastewater treatment plant of the No.3 Steel Plant for treatment and reuse.

Coke oven gas purification station

Since the equipment washing water contains naphthalin, it is designed that the drainage is first discharged into the water collection pond and then be sent to the wastewater treatment plant of the coking plant for treatment.



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Table 2.3-10 Production Wastewater Discharge Method of This Project 2) Discharge of domestic wastewater Discharged into the coking wastewater treatment plant for treatment; after the treatment, the water that meets relevant standards shall serve as the supplementary water of the blast furnace slag flushing water. 3) Rainwater Discharge Based on the calculation, the rainwater discharge quantity within the Project area in the initial stage after operation is about 1450m3, which is suggested to be collectively discharged into the coking wastewater treatment plant for treatment; after the treatment, the water that meets relevant standards shall serve as the make-up water of the blast furnace slag flushing water. 4) Wastewater Discharge Outlet

This Project has no discharged outlet for the production wastewater. 5) Collection Pond This Project shall be provided with the water collection pond which is shown in Table 2.3-11.

Water collection pond Quantity Dimensions Structure Water (oil) collection pond of the blast

furnace gas tank 2 set 6m×6m, 3m in

depth Underground type, cast-in-situ

reinforced concrete Water (oil) collection pond of coke oven

gas tank 2 set 4m×4m, 3m in


reinforced concrete Water collection pond for drainage from

electric precipitator of converter gas 1 set 3m×3m, 3m in


reinforced concrete Water (naphthalin) collection pond of

coke oven gas purification station 2 set 3m×3m, 3m in


reinforced concrete Circulating water pond 1 set 12m×7m, 2.2m

in depth Half-underground type,

cast-in-situ reinforced concrete Hot water ponds is arranged beside the gas cooling tower of the blast furnace.

1 set 6×4m, 5m in depth

Underground type, cast-in-situ reinforced concrete

Table 2.3-11 Water Collection Pond Arrangement of This Project 2.3.3.2 Power Supply and Distribution It shall be strictly designed according to the Code for Design of Electric Installations Within Explosion and Fire Hazard Atmospheres (GB50058－92).

(1) Exterior Power Supply The independent double-circuit 10kV exterior power supply shall be provided by the SGIS, with the power connection point arranged on the receiving end of the high-voltage incoming cabinet.

(2) Voltage Grade --Receiving Voltage AC 10kV --the voltage of high-voltage power supply and distribution shall be 10 kV AC 310 kV AC 3Ф (Party A has confirmed: the neutral point of the system shall adopt the non-earthing method) --the voltage of low-voltage dynamo power shall be 380V AC 3Ф4W (the neutral point adopting the TN-C-S system). --the distribution voltage of electrical lighting shall be 380/220V AC 3Ф4W (the neutral point adopting the TN-C-S system). --Control Voltage DC 220V for the high-voltage cabinet, AC 220V for the low-voltage cabinet. --the voltage for the inspection lighting shall be AC 36~12V (12V for special environment) --the capacity shall be more than 200kW (not including 200kW); the electric engine shall be supplied with 10kV power.

2.3.3.3 Ventilation and Air Conditioning



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(1) Ventilation The main workshops of the mixed gas & converter gas pressurization station and the coke oven gas station, the main inspection workshop and the high-voltage distribution room all shall be provided with the explosion-proof axial-flow ventilator or the axial-flow explosion-proof roof ventilator for ventilation. The axial-flow ventilator installed on the wall or roof of the main workshop and high-voltage distribution room can also be used to vent the smoke in case of accidents. Some small houses shall be provided with the ceiling fans.

(2) Air Conditioning In order to eliminate the residual heat emitted by the equipments installed inside the control room, operating room, management room, conference room, etc. and to ensure the normal operation of equipments and improve the working environment of operators, the above rooms shall, according to the different technical requirements, be equipped with the LFDNH electric heating air conditioner or the KFR wall-mounted air conditioner. The indoor design parameters: for the control room and operating room, the indoor temperature shall be 15~25oC, relative humidity 50~80％; For other rooms, the indoor temperature shall be lower than 30oC.

2.3.3.4 Thermal facilities The thermal facilities of this Project mainly include the steam pipes and compressed air pipes within the gas tank area.

(1) Steam Pipe For the Gas Tank Project, the steam shall mainly be used for the regeneration process of coke oven gas purification system and the tar cleaning of coke oven system. The steam shall be saturated and provided with the DN65 main pipe, with the consumption quantity being~1.8t/h and the pressure on the connection point 0.4~0.6MPa. The steam shall be supplied through the energy pipe network of the plant, with the connection point arranged 1m out of red line of the new-built tank area. Since the pressure of out-supplied steam is 0.8~0.9MP, the relief valve shall be arranged before the points which are connected with the users.

(2) Compressed Air Pipe The compressed air in the Gas Tank Project is mainly used as the air source of inspection purge; it shall be supplied through the energy pipe network of the plant, with the connection point arranged 1m out of red line of the new-built tank area.

2.3.3.5 Automatic Control The process operation of the tank area mainly focuses on the coke oven gas pressurization station and the mixed gas & converter gas pressurization station. The instrument monitoring system will adopt three sets of basic automatic systems featuring the instrumental-electrical integration to collect, monitor and control (loop control and sequence logic control) the process data of all industrial regions. And based on the Project progress, the three PLC systems shall finally be connected together through the Ethernet. Each set of the basic automatic system is planned to adopt the Siemens S7-300 series PLC control system, which consists of one set of controller and control network and two operating stations. The entire system shall be provided with one engineer station and one network printer; of which the engineer station shall be arranged in the control room of the mixed gas & converter gas pressurization station. The control system shall use the Windows operating system, and adopt the latest-issued STEP7 as the control software, and the latest-issued WinCC or Intouch as the development tool of operation display.

2.3.4 Environmental Protection Project (1) Foresting In order to beautify the environment and purify the air, the vacant places within the tank area, the passages on both sides of the roads as well as the surrounding places shall fully be utilized for planting, with the afforesting ratio at 25% and the green area reaching 18, 200 m2.



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(2) Treatment Measures for Water Environment The cleaner production wastewater shall be discharged into the clean drainage system of the plant for reuse; The dusty wastewater shall be discharged into the wastewater treatment plant of No.3 steel plant; after the treatment, such water shall enter the wastewater recirculation system of the plant. Phenol containing wastewater shall be discharged into the phenol-cyanogen wastewater treatment station of the wastewater treatment plant in the coking plant for treatment; after the treatment, the water that meets relevant standards shall serve as the supplementary water of the blast furnace slag flushing water. The A2/O biological denitrification process flow is adopted in the wastewater treatment facility, which is outlined as following: After passing through a series of preconditioning process of mix, degreasing, and dilution, wastewater is sent into the biological treatment system for further removing pollutants of the volatile phenol, cyanide, COD, ammonia nitrogen, and petroleum contained in the wastewater. See Table 2.3-12 for the quality of water into and out of the sewage treatment station.

Item CODcr Volatile phenol

Cyanide Ammonia nitrogen

Petroleum SS pH

In/out water

quality <3500 <700 <20 <150 <50 <100 7～8

Out water quality ≤90 ≤0.3 ≤0.3 ≤10 ≤5.0 ≤60 6.5～7.5

Table 2.3-12 In/out water quality index for the phenol/cyanide wastewater treatment station (unit: mg/l, except pH)

(3) Solid Waste The industrial solid wastes produced by this Project mainly come from the replacement of absorbent of the coke oven gas purification station. Of which, the sulfur adsorbent shall be delivered to the coking plant for recovery; while the ceramic ball packing, CAN-110 and CAN-229 reclaimed by the manufacturers. The daily domestic wastes produced by the working staff within the tank area shall be collectively disposed by the environmental sanitation department.

(4) Noise treatment facilities The main noise sources of this Project include: the dedusting fan, the coke discharging device of coke dry quenching furnace, the relief valve of coke dry quenching boiler, circulating fan and circulating air outlet, turbogenerator, various pumps and so on. The noise controlling adopted in this project is mainly a combination of methods of controlling noise sources and cutting off noise transmission ways, in order to control noise impact on neighbors of plant boundary. Now the controlling measures are described below: For equipment type selection, various types of ventilators and pumps shall be selected low-noise products as much as possible. Individual foundations or vibration damping measures are established for the dust removal ventilators and pumps, and flexible connection modes are adopted among strong vibration equipment and pipelines to prevent the noise producing from vibration spreading outward. The acoustical treatments shall be carried out on the circulating fan, circulating air pipe, etc. The rational deployment is conducted utilizing factors of terrain, plant house, and direction of noise sources as well as noise absorbing function of afforesting plants when the general layout is carried out; the role of comprehensive treatment is fully taken account to management to reduce noise pollution. After the measures above are applied, the day and night noise values of factory boundary are predicted to be able to comply with the standard values class III of Standard for Noise at Boundary of Industrial Enterprises (GB12348-90).



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(5) Investment on Environmental Protection The total investment of the project is 344.52 million RMB, including 1.1272 million RMB on environmental protection, which accounts for about 0.33% of the total investment.

2.3.5 Transportation (1) Road The roads within the tank areas will mainly be used for the purpose of inspection and fire fighting. A 4.0m-wide circulating road will be designed in the tank area, with two exits respectively connected with the planned road on the north of the plant area and the existing gas tank area. The road shall adopt the urban cement concrete pavement, the structure of which consists of the 24cm-thick cement concrete surface layer, the 15cm-thick cement stable debris basement and the 20cm-thick slag cushion layer. The minimum turning radius of the road surface edge at the intersection shall be 9m, and the road longitudinal slope not more than 6.0%. The paving area of sidewalk shall be 800 m2.

(2) Connection Points of Energy Media The main pipeline involved in the Gas Tank Project of SGIS shall include the gas pipe, steam pipe, production-fire fighting water supply pipe, domestic water supply pipe, production drainage pipe, domestic drainage pipe, rainwater drainage pipe, cable (duct), lighting wire and so on. The designed connection points of various pipelines shall be arranged 1 m out of the red line.

2.4 Working principle of gas tank All the blast furnace gas tank, industrial coke-oven gas tank and civil coke-oven gas tank used in the project will adopt new dry gas tank (POC), and the converter gas tank will adopt Wingins dry gas tank, its working principle is as blow:

2.4.1 Working principle of new dry gas tank (POC) The new dry blast furnace gas tank is of cylindrical shape, there is oil groove around the piston, in which there is a seal structure composed of specially made seal rubber ring, clamping device and step-up device. Sealing thin oil of certain depth will be filled in the oil groove to make it full of the space between the piston and side plate so as to realize sealing effect. Oil will be supplied by circulating of the oil-water separating system. The gas tank will be used to store blast furnace gas or coke oven gas. The volume of the gas tank consists of piston, piston sealing device, seal rubber ring, clamping device, step-up device, side plate and base plate. Sealing is realized through upward/downward movement of the piston, piston sealing device to meet the change of gas volume in the gas tank. Increasing or reducing of gas storage volume is realized by up and down of the piston and its sealing device. (1) When gas pressure of the external pipe network is higher than that of the internal gas tank, piston and its sealing device will rise, and will result in increment of the gas storage volume; (2) When gas pressure of the external pipe network is higher than that of the internal gas tank, piston and its sealing device will lower, and will result in decrease of the gas storage volume; Pressure stability of the pipe network will be realized through self handling of the gas tank.



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Figure 2.4-1 Section Plan of New Dry Blast Furnace Gas Tank

2.4.2 Working principle of Wingins dry gas tank Converter gas tank is designed as a Wingins dry gas tank, and a movable sealing cavity is formed by a rubber sealing membrane, side plate, upper and lower T baffle plate and piston for storing gas. Increasing or reducing of gas storage volume is realized by up and down of the piston and T baffle place. When the piston and T baffle plate rise, the rubber sealing membrane will roll over upward to increase gas swallow; when the piston and T baffle plate fall down, the rubber sealing membrane will roll over downward to reduce gas supply; the working principle is shown in Figure 2.4-2.

flexible soft pipe

upper oil tank

oil pump

piston oil tank

piston

rigidity oil pipe

oil tank at gas tank base gas

gas filling pipe

Piston position when it is fully extended

Upright post Side plate



29

Figure 2.4-2 Working principle of Wingins dry gas tank

(1) Status: no air inlet (2) Status: when air enters the gas tank, sealing membrane will blow up first, then the internal membrane will rise to the ultimate position at the upper of the T baffle plate pulled by the piston under the action of gas pressure. (3) c Status: when air continues to enter the gas tank, the T baffle plate and external membrane will rise pulled by the piston baffle plate; (4) d Status: the piston baffle plate, T baffle plate and external membrane rise to the ultimate position. When air flows out of the gas tank, the moving direction of piston baffle plate, T baffle plate and rubber sealing membrane is completely opposite to above-mentioned course, and they will at last restore to the original status.

2.5 General layout plan

2.5.1 Description of layout plan The main facilities include one 300,000m3 blast furnace gas tank, two 80,000m3 converter gas tanks, one 100,000m3 coke oven gas tank for industrial use and one 30,000m3 coke oven gas tank for civil use, as well as gas purification and pressurization system and wastewater collection sump. Auxiliary facilities include converter gas electric dedusting equipment, gas mixing station, coke oven gas pressurization station, mixed gas pressurization station etc. According to the fire and explosion protection requirements on safe distances between gas tank and surrounding buildings and between the gas tanks, 5 gas tanks will be arranged on the north side in two rows, the gas purification and pressurization station on the south side, and the wastewater disposal basin on the east side. Detailed general layout plan is shown in Figure 2.5-1.

top of gas tank

external seal

T baffle support piston baffle

piston plateinternal seal

gas

T baffle stage

base plate

side plate



30

Fig 2.5-1 General Layout of the Project



31

In consideration of the flood control requirement of Meihuahe River and its connection with peripheral roads, the five gas tanks and service shop will be arranged on bench of El.66m, and the gas purification and pressurization facility and water treatment plant will be arranged on the bench of El. 70m. The indoor and outdoor difference of the buildings is 0.3m in datum mark.

Anti-seismic intensity in the project area is designed as 6. Main technical and economic index of transportation is shown in Table 2.5-1.

No.: Index No.: Unit Quantity Remarks 1 Project land area 104m2 7.26 2 Occupied area of structures 104m2 1.62 3 Construction coefficient 22.3％ 4 Road paving area 104m2 1.00 5 Sidewalk area 104m2 0.08 6 Afforesting land area 104m2 1.82 7 Afforesting land rate 25％

Table 2.5-1 Main technical and economic index of transportation

2.5.2 Safety and Rationality Analysis of the General Layout (1) Fire protection distance and rationality The project site selection is consistent with the SISG land planning. The building layout and fire spacing meet relevant regulations in Code for Fire Protection Design of Buildings (GB 50016－2006), Code for

Design of Urban and Rural Gas Supply (GB 50028－2006) and Design Code for General Layout and

Transportation in Metallurgical Enterprise (YBJ 52－88). The distance for fire protection between gas tank and peripheral buildings shall satisfy relevant specifications in Code for Design of City Gas Engineering (GB 50028-2006). See Table 2.5-2.

Minimum clear distance

Fire space Rationality analysis

Between 80,000 m3 converter gas tanks (φ58.2m)

40.948m

No.1, 80000m3 converter gas tank (φ58.2m) – 30000m3 coke oven gas tank (φ29.07m)

77.173m

No.2, 80000m3 converter gas tank– coke oven gas tank with 30000m3

40.956m

No.2, 80000m3 converter gas tank– coke oven gas tank with 100000m3(φ46.9m)

41.298m

38.8m

No.2 80000 m3 converter gas tank 300000m3 coke oven gas tank (φ64.6m)

46m

300000m3 blast furnace gas tank - 30000 m3

coke oven gas tank 47.166m

43.067m

100000m3 coke oven gas tank (φ46.9m) -coke gas purification station

≥31.267m 31.267m

No.2 80000m3 converter gas tank (φ58.2m) and coke oven gas booster station

≥31.25m 31.25m

No.1 80000m3 converter gas tank (φ58.2m), mixed gas and converter gas booster station

≥31.25m 31.25m

The minimum clear distance from the electrostatic precipitator

≥43.75m 43.75m

The minimum clear distance from overhaul workshop

≥31.25m 31.25m

All are designed in accordance with the requirements of fire space and comply with the designing regulations.



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The minimum clear distance from each gas tank to road in tank area

≥5m 5m

Table 2.5-2 Rationality analysis of fire space between gas tanks, auxiliary facilities and roads

(2) Rationality analysis on layout of the fire protection area All fire compartments, life exits and exit distance shall be designed as the requirement of Code for Design of Building Fire Protection and Prevention (GB 50016-2006), details are as below: The mixed gas and converter gas pressurization station and electric room will be divided into 3 classes of fire compartments, with the area of Class B is 1287m2, of Class C is 58.5 m2，and of Class D is 1491.3 m2.

The coke-oven gas pressurization station and electric room will be divided into 2 classes of fire compartments, with the area of Class A is 756m2 and Class D is 997 m2. In terms of layout, the spaces between the new buildings meet the relevant design needs for fire prevention; the fire prevention area is set up in strict accordance with Code of Design on Building Fire Protection and Prevention (GB 50016-2006), which ensures to some extent the safe operation of the gas tank area.

2.6 Existing gas tank of SGIS

2.6.1 General conditions of existing gas tank 2.6.1.1 Scale and location (1) Scale SGIS now boasts two 100,000m3 blast furnace gas tanks, one 70,000m3 coke oven gas tank, one 20,000m3 coke oven gas tank for industrial use, one 80,000m3 converter gas tank, one 20,000m3 coke oven gas tank for civil use, one blast furnace/coke oven/converter gas mixing and pressurization station (with capacity of 100,000m3/h), one blast furnace/coke oven gas mixing and pressurization station (with a capacity of 30,000m3/h), and two coke oven gas pressurization stations with a compressing capacity of 3000m3/h.

(2) Location The project is located in the north of SGIS, with a vegetable plot in the north and part of east side, the selected site for the newly-built gas tank area in the east, No.2 blast furnace of iron-making plant in the south and other plants of SGIS in the west, details are shown in the following drawing.

2.6.1.2 Process flow Gas pressurization station includes converter pressure station, coke oven and blast furnace gas pressuring machine, coiling furnace coke oven gas pressuring machine, coke oven gas pressuring machine for cutting

vegetable plot

plan

t are

a

gas tank

2# blast furnace Iron-making Plant Converter

Steel-making Plant technical

reformation of the mill

Electric Furnace Steel-making

Plant

old plant area

equipment warehouse

thermal power station



33

with continuous casting. Gas mixing station includes blast furnace and coke oven gas mixing station, employing three-valve regulating system; blast furnace, coke oven and converter gas mixing station employing single-valve flow ratio to control heat value and adjust index through blast furnace and coke oven gas mixing station. Coke oven gas purification device: quality of gas for cutting and coiling furnace is strictly controlled, and purification treatment is needed for coke-oven gas. Gas purification applies adsorption process to detar and remove naphthalene, and dry desulfurization process is adopted for desulfurization.

Figure 2.6-1 Blast furnace gas tank flow process

Figure 2.6-2 Coke oven gas tank flow process

Figure 2.6-2 Converter gas tank flow process

2.6.2 “Three-wastes” of the existing gas tank Environmental protection center monitoring station of Guangdong province conducted completion acceptance of the existing gas tank in November 2005, the acceptance objects include a newly-built new type dry blast furnace gas tank of 100,000 m3, a 70,000 m3 coke oven dry gas tank, a blast furnace and coke oven gas mixing station, a blast furnace, coke oven and converter gas mixing station, cooling facilities of gas station; coke oven gas purification station; coke gas storage tank; coke oven pressurization station for coiling furnace; coke oven gas pressurization station for cutting with continuous cast, pipeline, power supply and distribution and water supply and drainage facilities in the gas tank area. According to the Completion Acceptance Report On New Gas Tank Area in Guangdong SGIS Songshan Co., Ltd, prepared by Guangdong province environmental protection center monitoring station in November 2005, “three wastes” discharge of the existing gas tank is as shown in Table 2.6-1. Pollution route Main pollutants Treatment

Exhaust Gas

Under normal conditions, there is no exhaust gas emitted, and the coal gas is leaked under abnormal conditions.

CO, H2, N2, hydrocarbon

Production Wastewater

Cooling water from cooling booster and cooling tower

Temperature variation

Water quality is not changed. Wastewater is recycled after the cooling treatment by the cooling tower and is not discharged outside.

blast furnace gas cooling tower water seal gas tank gas mixing station

gas network

coke oven gas Naphthalin removal

tower (activated carbon adsorption)

dry desulfurization tower

coiling furnace coke oven gas pressuring machine

user

user Pressure adjustment and measurement of coke oven

coke oven gas pressuring machine for cutting with continuous casting

coke gas storage tank

converter gas wet-type dedusting(without discharge outlet) user

wastewaterwastewater treatment facility of the

converter



34

A small amount of phenolic wastewater which is generated from the production of coke oven gas tank.

Phenol

A collection sump is installed in tank area to collect phenol containing wastewater, when reaching a certain quantity, such wastewater shall be delivered regularly to the phenol-cyanogen wastewater treatment station for treatment.

A small amount of oil is contained in the blast furnace gas. During storage in the gas tank for some time, the oil substance will be deposited and form oily wastewater with water.

Oil

A collection sump is installed in tank area to collect phenol containing wastewater, when reaching a certain quantity, such wastewater shall be delivered regularly to the phenol-cyanogen wastewater treatment station for treatment.

Mainly includes dusty wastewater from wet electrostatic precipitator of the converter gas.

Powder

Discharged into the converter turbid circulating water system for treatment and reused as turbid circulating water without discharge outside.

Domestic wastewater

pH, suspended substance, COD, BOD5, animal vegetable oil, ammonia nitrogen, phosphate, anion surface active agent

Discharged into the sewer pipeline network after treatment in the three-level septic tank, and then discharged into the Meihua River through the general outlet in the company.

Noise Mechanical noise from the gas booster and water circulating pump.

Select low-noise equipment, install muffler in vent of the air-blaster and dedusting fan, and install damping pedestal for fans to reduce the noise impact.

Solid waste

Mainly are waste adsorbents which include the activated carbon periodically discharged from the coke oven gas purifying installation, iron oxide, etc.

Active carbon and iron oxide are delivered to Raw Material Plant of the Company for reuse after sorting and treatment.

Domestic waste Collected and treated by the local sanitary department.

Emergency response plan

Establish the Emergency Response Plan for Hazardous Chemical Accidents, Emergency Response Plans for “Three-major” Accidents Including Gas Fire, Poisoning and Explosion. Carry out analysis of potential environmental risk in each procedure, and make specific regulations on handling of emergency accidents.

Table 2.6-1 Production of “three-wastes” of the existing gas tank On April 3, 2008, the monitoring station (Guangdong Metallurgic Environmental Monitoring Station) of SGIS conducted monitoring of CO in the ambient air of gas tank, the monitoring value of 0-0.884mg/m3 is far lower than the Class Ⅱ standard of 4mg/m3 (See appendix).

The monitoring result shows that the normal operation of the gas tank project will not bring side influence on the surrounding environment.

2.6.3 Treatment on the existing gas tank After completion of the new gas tank, one old 100,000m3 blast furnace gas tank, one 20,000m3 coke oven gas tank for civil use and one coke oven gas pressurization station will be out of service. Ex-service gas tank steel will be recycled by the steel plant.



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3 Engineering Analysis

3.1 Raw materials and energy consumption

3.1.1 Analysis on gas physical properties

3.1.1.1 Coke Oven Gas

(1) Impurity content in elementary gas

Impurity H2S Tar Naphthalene NH4 Benzene Water

content 200 mg/ m3

50 mg/ m3

300 mg/ m3

50 mg/ m3

4000 mg/ m3 Saturation

Table 3.1-1 Impurity content table for elementary coke oven gas (2) Impurity content requirement for gas users 1) Industrial coke oven gas (cutting users)

Impurity H2S Tar Naphthalene NH4 Cyanide Water

content <20 mg/ m3

<10 mg/ m3

<200 mg/ m3

<30 mg/ m3

<150 mg/ m3 Saturation

Table 3.1-2 Impurity content requirements for industrial coke oven gas (cutting users) 2) Civil coke oven gas

Impurity H2S Tar Naphthalene NH4 Cyanide Water

content mg/ m3 <10 mg/ m3

<47 (winter) <94

(summer) mg/ m3

<50 mg/ m3

<150 mg/ m3 Saturation

Table 3.1-3 Impurity content requirements for civil coke oven gas (3) Physical properties after purification of coke oven gas Physical properties after purification of coke oven gas is shown as table 3.1-4

Items C0 C02 CmHn N2 H2 02 CH4 Value after purification (%) 6.9 3.2 1.9 5.0 58.2 0.7 24.1

H2S3 Tar Naphthalene Moisture NH3 Value after purification

(mg/Nm3) <20 <10 Saturation

Table 3.1-4 Analysis on purified coke oven gas component 3.1.1.2 Gas mixed physical properties

The blast furnace gas (~9.5kPa, 200000Nm3/h) and the coke oven gas (~6kPa、80000Nm3/h) from the gas main pipe of the tank area shall, based on the flow proportion and heating value feedback, be mixed together to form gas mixture from blast furnace and coke oven (~4kPa,280000Nm3/h, 7527kJ/Nm3), and then delivered to the mixed gas pressurization station to has its pressure increased to 18kPa. The pressurized gas mixture from blast furnace and coke oven shall, based on the flow proportion and heating value feedback, be mixed together with the converter gas (~19kPa, 40000~75000Nm3/h, 7527kJ/Nm3) to form the gas mixture from blast furnace, coke oven and converter, and then supplied to the whole mixed gas users of the plant. Mixed physical properties is shown in Table 3.1-4

No.: Items Unit Parameters



37

Blast furnace gas: CO2:17.4, CmHn:0.2, O2:0.7, CO:26.3, CH4:0.9, H2:0.4, N2:51.4

Coke oven gas: CO2:3.2, CmHn:1.9, O2:0.7, CO:6.9, CH4:24.1, H2:58.2, N2:5.0 1 Gas component Volume

ratio (%) Converter gas: CO2:15.8, CmHn:0.5, O2:0.5, CO:67.5, CH4:1.7,

H2:1.2, N2:30.8

2 Heat value kJ/m3 Blast furnace gas: 3550 Coke oven gas: 17300 Converter gas: 7527

3 Temperature Blast furnace gas: ~150 Coke oven gas: 0~40 Converter gas: 0~70

4 Scale of mixing system Nm3/h Secondary mixing system: 280000

Converter gas: 40000~75000

5 Heat value of the mixed gas kJ/m3 7527

Table 3.1-4 Analysis on mixed gas physical properties 3.1.1.3 Blast furnace gas physical properties

Items C0 C02 N2 H2 02 CH4 H2Smg/Nm3 Dust content mg/Nm3

Value % 26.3 14 56.5 0.5 0.8 0.2 200 <10

Table 3.1-5 Blast furnace gas physical properties 3.1.1.4 Physical properties of Converter Gas

Items C0 C02 N2 H2 02 CH4 H2S mg/Nm3 Dust concentration mg/Nm3 Value % 67.5 15.8 30.8 1.2 0.5 1.7 <20 <100

Table 3.1-6 Physical properties of Converter Gas 3..1.1.5 Physical properties of sealed oil Sealed oil physical properties for blast furnace gas tank, industrial coke oven gas tank, civil coke oven gas tank and etc. in the tank area are shown in Table 3.1-6

Items Unit Technical index Kinematic viscosity 50 mm2/s 53~58 Solidifying point ≤-10 Flash point (opening) ≥180 Density (20) k g/m3 900~920 Resistance to emulsification (40-37-3ml) 82 min ≤30 Corrosion test (3h, 100, sheet steel) Qualified Acid value mg KOH/g ≤0.3 Water % trace Mechanical impurity % ≤0.05 Oxidizing safety (time for acid value reaching 2.0mgKOH/g) h ≥1000

Table 3.1-6 Physical properties of sealed oil

3.1.2 Gas balance analysis Coke oven gas in the main pipe of gas tank are composed of industrial coke oven gas, civil coke oven gas and mixed gas. The purified industrial coke oven gas will enter into the existing coke oven gas pipe network system for cutting after it reaches the cutting requirement, with a flow of 7000 m3/h, they are mainly used for continuous casting and cutting of 3×150t converter billet and associated RH; after civil gas is purified and reaches the civil gas quality requirements, its flow will be 3,000 m3/h, then it will be sent into the civil gas pipe network; other part of coke oven gas will enter into mixed gas system, which will generate mixed gas with blast furnace gas, with a flow of 80,000 m3/h; eventually, it will generate the



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mixed gas for usage of the mixed gas users of the company. Blast furnace gas and converter gas will entered into the gas tank area to form mixed gas to be supplied for the mixed gas users of the whole plant, which is shown in Figure 3.1-1.

Figure 3.1-1 Diagram of as balance in gas tank area

3.1.4 Energy consumption Power consumption is shown in Table 3.1-5

No.: Project Title: Unit Annual consumption quantity Remarks 1 Power 104kWh 2159.85 2 Fresh water 104m3 63.2 3 Nitrogen gas 104m3 526 4 Steam t 86

Table 3.1-5 Power consumption

3.2 Water usage and water balance in the project Due to the special technological conditions of the project, the production water is usually used many times a year. Therefore, annual water demand is applied for easy calculation. Water balance of the project is shown in Table 3.2-1 and Figure 3.2-1, water usage of each gas tank is shown in Table 3.2-2-3.2-5. The supplemented water is 627071.25 m3/a, the total water amount for the project water circulation system is 340 m3/h (2978400 m3/a), circulating water amount is 334.9 m3/h, the new supplemented water is 5.1 m3/h, and the recycling rate is 98.5 %.

Make-up water quantity Gas intake water quantity

Water discharge quantity

Remarks

Make-up Fresh Water

Amount

Make-up water for the recycling

water

44676 /

Make-up water for blast furnace gas:3m3/h,

Make-up water of the recycling water for mixing

gas and convertor gas booster station: 0.3m3/h，Make-up water of the recycling water for coke gas booster station:

1.8m3/h

blast furnace gas 200,000m3/h

converter gas 75,000m3/h

blast furnace gas tank200,000m3/h

75,000m3/h converter gas tank m

ixed

gas

coke oven gas 80,000m3/h

355,000m3/h

mix

ed g

as u

sers





cutting user

civil



39

Water supply for gas tank

49221.5 6307.2 50635.3

Oily wastewater:6307.2 m3/a；Naphthalin containing

wastewater: 480 m3/a， Phenol containing

wastewater:36360.1m3/a； Clean sewage: 7488 m3/a

Water supply for electrostatic

precipitator of converter gas

525600 / 525600 Water supply for electrostatic precipitator of converter gas is 60 m3/h.

Domestic water supply 7573.75 / 6816.375

Recycling Water

Amount

/ 2978400 / 17822 Enter clean sewage system in the plant area

Initial rainwater

1450

Supplementary quantity for the fresh water is 632023.3m3/a and the clean recycling water quantity is 2978400 m3/a.

*Note: saturated water is contained in the gas. Partial water will be condensed and sepatated out with temperature change, and forms to oily wastewater after oil-water separation in the oil pump station.

Table 3.2-1 Water balance in gas tank area

Classification No.: Items Water supply

quantity

Water quality

Water consumption

sites


m3/h

Water quality Remarks

1 Washing water of the oil groove in base of

the gas tank 35m3/h

Fresh water for

production4 35 Phenylic,

oily

1h/time, once every 3 months,

do not use simultaneously.

2

Drainage of the cooling water from the tank base and water supply for

water seal

0.5 m3/h Fresh

water for production

3 0.08 Phenylic, oily

Used with 10 minutes/time in

production.

3 Separation water

discharged from the oil pump station.

6 0.06 oily Continuous

The gas tank body

4 Water level of the oil groove in base of the

gas tank 150m3

Fresh water for

production1 Phenylic,

oily

One-time use in production (from the

washing water)

Cooling system 5 Cooling spray water 100

m3/h 2

Including recycling water with 98.5m3/h

and supplementary

water with 1m3/h



40

6 Water supply and drainage for water

seal DN2600 55m3

Fresh water for

production1 55m3

1-2 times/a, full fill in 15minutes

each time Pipeline

7 Water supply and drainage for water

seal DN1400 20 m3

Fresh water for

production1 20 m3

1-2 times/a, full fill in 15minutes

each time

Others 8 Washing of the terrace 2 m3/h

Fresh water for

production2

Approximately 20~30min/time, and 24times/a in

total.

Table 3.2-2 Water production of 300,000 m3 blast furnace gas tank *new water amount is 26925.5 m3/a


quantity Water quality

Water consumption

sites


m3/h


1 Washing water of the oil groove in base of the gas tank

30 m3/h Fresh water for production

1 30 Phenol containing

Approximately 1h/time, once

every 3 months

2 Drainage of the cooling water from the tank base and water supply for water seal

0.5 m3/h Fresh water for production

2 0.08 Phenol containing


production.

3 Separation water discharged from the oil pump station.

4 0.06 Phenol containing

Continuous

The gas tank body

4 Water level of the oil groove in base of the gas tank

100 m3 Fresh water for production

1 One-time use in production (from

the washing water)

Purification station

5 Water supply and drainage for equipment washing


1 20 m3 Naphthalin containing

Drainage is transferred outside by the catchment tank vehicles with 1 time/month and

1h/time. 6 Water supply

and drainage for water seal DN1600


1 35 m3 Phenol containing

1-2 times/a, full fill in 15minutes each

time

Pipeline 7 Water supply and drainage for water seal DN800

8m3 Fresh water for production

1 8 Phenol containing

1-2 times/a, full fill in 15minutes each

time

Others Washing of 2 m3/h Fresh water for 2 Approximately



41

the terrace production 20~30min/time, and 24times/a in

total.

Table 3.2-3 Water production of 100,000 m3 industrial coke oven gas tank *New water amount is 429.5 m3/a


quantity Water quality

Water consumption

sites


m3/h


1

Washing water of the oil groove in base of the

gas tank

30 m3/h Fresh water for production 1 30 Phenol

containing

Approximately 1h/time, once

every 3 months

2

Drainage of the cooling water from

the tank base and water supply for water seal

0.5 m3/h

Fresh water for production 2 0.08 Phenol

containing


production.

3

Separation water

discharged from the oil

pump station.

2 0.06 oily Continuous

The gas tank body

4

Water level of the oil groove in

base of the gas tank

70 m3 Fresh water for production 3

One-time use in production (from the

washing water)

Purification station

9 Water supply and drainage for equipment washing


1 20 m3 Naphthalin containing

Drainage is transferred

outside by the catchment tank vehicles with 1 time/month and

1h/time.

5

Water supply and drainage for water seal

DN700

7 m3 Fresh water for production 1 7 m3 Phenol

containing

1-2 times/a, full fill in

15minutes each time

Pipeline

6


DN500

5m3 Fresh water for production 1 5 m3 Phenol

containing


15minutes each time



42

7


DN400

3m3 Fresh water for production 1 3 m3 Phenol

containing


15minutes each time

Others 8 Washing of the terrace 2 m3/h Fresh water

for production 2

Approximately 20~30min/time, and 24times/a

in total. Table 3.2-4 Water production of 100,000 m3 industrial coke oven gas tank

*Annual usage amount of new water is 415.5 m3/a.

Classification No.: Items Water supply quantity

Influent water quality

Water consumption sites



1 Water seal supply

0.4m3/h Fresh water for production

1×2 Continuous

2 Water seal and bottom drainage

1×2 2 m3/h Continuous 80000 m3

Wiggins gas tank (2 sets) 3 Water supply

and drainage for bottom dust removing


1×2 60 m3 Dusty

1h/time, 4times/a

4 Continuous water supply

23 m3/h Fresh water pressurization

1×2

5 Discontinuous water supply

12m3/h Fresh water pressurization

1×2 Calculation is based on 60m3/h Electrostatic

precipitator for coal transfer (1 set in use and 1 set is spare)

6

Drainage

60 m3/h Dusty Collected by the wastewater treatment plant of No.3 Steel Plant

Mixed Gas & Converter Gas Pressurization station

7

Water supply

20 m3/h 1

Coke Oven Gas Pressurization station

8

Water supply

120 m3/h

1

Gas mixing station

11 Water supply

25 m3/h Fresh water for production

1 1 time/shift, 1h/time

Other water consumption in the tank area

12 Water supply and drainage for water seal of the whole gas pipeline


(3) 50 m3 Use three sets simultaneously for the full fill with 4 times/a and 30mins/time.



43

Classification No.: Items Water supply quantity

Influent water quality

Water consumption sites



13 Water supple by the drainer

0.1 m3/h

Fresh water for production

(20) 0.2 m3/h Use twenty sets simultaneously

Table 3.2-5 80,000 m3 Wingins gas tank and other water production table



44

Figure 3.2-1 Diagram of water balance in the gas tank area

17822m3/a

4843.9m3/a 26854m3/a 7488m3/a

2978400m3/a

6816.375m3/a

525600m3/a

49963.5m3/a

43147.3m3/a

Domestic water supply

525600m3/a

Water amount with gas: 6307.2m3/a

7573.75m3/a

49221.5m3/a

44676m3/a

Recycling water for gas cooling

New water supply amount

Gas tank: including tank body, mixing station, pipeline water seal and drainer

Fresh water usage amount: 627071.25 m3/a Recycling water amount: 2978400 m3/a Drainage amount: 0 m3/a Loss amount: 31697.9 m3/a

2978400m3/a

Phenolic-cyanogen wastewater treatment station of the wastewater treatment plant in the coking plant

Cooling tower

525600m3/a Wastewater treatment plant in No.3 Steel Plant

Flushing dust from electrostatic precipitator of the converter

Recycle in turbid circulating system of the Group

Gas tank: including tank body, mixing station, pipeline water seal and drainer

Clean sewage system of the Group



45

3.3 Analysis on the process flow and the pollutant producing process

3.3.1 Analysis on the process flow for blast furnace gas tank and the pollutant producing process

3.3.1.1 Process flow for blast furnace gas tank

Figure 3.3-1 Analysis on Process Flow for Blast Furnace Gas-tank and Pollutant Producing Process

Figure 3.3-1 shows the process flow for converter gas tank. The blast furnace gas, coming out through the main blast furnace gas tube, enters the gas tank body via water seal after being cooled in the cooling system. The blast furnace gas, after being cooled by the parallel cooling system, enters the tank body. Make sure that the temperature of the gas tank is controlled within 60. The gas in the gas tank returns via the same gas incoming tube to the blast furnace gas network outside the tank area. Under abnormal operations of the upper devices, the gas amount will be changed, and piston will reache its upper position for non-released combustion of gas in the coke oven area. When the piston reaches its upper position, the excessive gas in the gas tank that needs to be released is released via the safety release pipe laid on the blast furnace gas tank. 3.3.1.2 Analysis on the pollutant producing process Referring to Acceptance Report of the New Gas Tank Area Project of Guangdong Shanguan Iron & Steel Group Limited Company (Nov.2005) by the Central Environmental Monitoring Station of Guangdong Province, we can know that: Neither the blast furnace gas tank nor the coke oven gas emits any waste gas under normal conditions. Only when there is gas leakage under abnormal conditions will gas be emitted via safety gas release pipe. The major pollutants are carbon monoxide, hydrogen, nitrogen and hydrocarbons. The wastewater produced in the gas tank includes the condensing water under the floor of the gas tank body, the flushing water from the oil groove on the gas tank floor, the oil/water separating wastewater in the oil pump station, the water from the water layer in the oil groove on the gas tank floor, tank area rinse wastewater as well as other phenol containing wastewater. Besides, certain quantity of sealing water produced in pipes DN1600 and DN800 will be discharged into the wastewater treatment plant in the coking plant for treatment. Certain quantity of clean sewage may be produced in the mixed gas pressuring station and will be discharged into the clean sewage system for recycling.

3.3.2 Analysis on the process flow for industrial Coke Oven Gas Tank and Pollutants Producing Process

3.3.2.1 Process flow

oil pump station

Pipeline water seal of the blast-furnace gas tank area

blast-furnace gas

cooling tower (water seal) gas tank gas mixing station gas mixture

pressuring station user

field flushing of the blast-furnace tank area



46

Figure 3.3-2 Analysis on the process flow for industrial coke oven gas tank and the pollutant producing process

Figure 3.3-2 shows the process flow for civil coke oven gas tank. The coke oven gas comes out through the chief coke oven gas pipe within the tank area and enters the industrial coke oven gas tank through the water seal, which, will enter the industrial coke oven gas purifying station for the removal of naphthalene, tar, NH3, HCN and part of H2S in it. The gas in the gas tank returns via the same gas incoming tube to the coke oven gas network outside the tank area. When the piston reaches its upper position, the excessive gas in the gas tank that needs to be released is released via the safety release pipe. The purified industrial coke oven gases have a pressure of ~3kPa, and they cannot be supplied to the users until being pressured by the industrial coke oven gas pressuring machine. They can be directly used by users for continuous casting and cutting. 3.3.2.2 Pollution-producing links: Base on The Approval Report of the New Gas Tank Area Project of the Shanguan Iron & Steel Group Limited Company of Guangdong Province by the Central Environmental Monitoring Station of Guangdong Province, we can know that: Neither the blast furnace gas tank nor the coke oven gas emits any waste gas under normal conditions. Only when there is gas leakage under abnormal conditions will gas be emitted via safety gas release pipe. The major pollutants are carbon monoxide, hydrogen, nitrogen and hydrocarbons. During the operation of industrial coke oven gas tank, industrial solid waste is produced when the packaged absorbent on the purifying station is changed once every two years. The absorbent will be treated for recycling in the coking plant after adsorption.. The wastewater produced in the gas tank includes the condensing water under the floor of the gas tank body, the flushing water from the oil groove on the gas tank floor, the oil/water separating wastewater in the oil pump station, the water from the water layer in the oil groove on the gas tank floor, tank area rinse wastewater as well as other oily wastewater. Besides, certain quantity of water seal water produced in pipes DN2600 and DN800 will be discharged into the wastewater treatment plant in the coking plant. Certain quantity of naphthalene containing wastewater , tar, NH3, HCN, H2S is produced in the industrial coke oven gas purifying device and it will be regularly collected for entrusted treatment. Certain quantity of clean sewage may be produced in the coke oven gas pressuring station and gas mixture pressuring station and the water will be discharged into the clean sewage discharge system for reclamation.

3.3.3 Analysis on the process flow for civil coke oven gas tank and the pollutant producing process

3.3.3.1 Process flow

oil pump station

Pipeline water seal of the industrial coke oven gas tank area

coke oven gas (water seal) gas tank gas mixing station

gas mixture pressuring station field flushing of the blast-furnace tank area

Field flushing of the industrial coke oven gas tank area

industrial coke oven gas compresser

industrial coke oven gas

purifying device

industrial coke oven gas continuous casting cutting user



47

Figure 3.3-3 Analysis on Process Flow for Civil Coke Oven Gas Tank and Pollutant

Producing Process Figure 3.3-2 shows the process flow for industrial coke oven gas tank. The coke oven gas comes out through the chief coke oven gas pipe within the tank area and enters the industrial coke oven gas tank through the water seal, and then enters the industrial coke oven gas purifying station to remove naphthalene, tar, NH3, HCN and part of H2S in it and meet the civil coke oven gas quality standard. The purified gas in the coke oven gas tank returns via the same gas incoming tube to the coke oven gas network outside the tank area. Under abnormal operations of the upper devices, the gas amount will be changed, and piston will reache its upper position for non-released combustion of gas in the coke oven area. When the piston reaches its upper position, the excessive gas in the gas tank that needs to be released is released via the safety release pipe. . 3.3.2.2 Pollution-producing links: Base on The Approval Report of the New Gas Tank Area Project of the Shanguan Iron & Steel Group Limited Company of Guangdong Province(Nov.2005) by the Central Environmental Monitoring Station of Guangdong Province, we can know that: Neither the blast furnace gas tank nor the coke oven gas emits any waste gas under normal conditions. Only when there is gas leakage under abnormal conditions will gas be emitted via safety gas release pipe with carbon monoxide, hydrogen, nitrogen and hydrocarbons as the major pollutants. The wastewater produced in the gas tank includes the condensing water under the floor of the gas tank body, the flushing water from the oil groove on the gas tank floor, the oil/water separating wastewater in the oil pump station, the water from the water layer in the oil groove on the gas tank floor, tank area rinse wastewater as well as other phenol containing wastewater. Besides, certain quantity of sealing water produced in pipes DN700, DN500 and DN400 will be discharged into the wastewater treatment plant in the coking plant for treatment. Certain quantity of naphthalene containing wastewater , tar, NH3, HCN, H2S is produced in the industrial coke oven gas purifying device and it will be regularly collected for entrusted treatment. Certain volume of clean sewage may be produced in the coke oven gas pressuring station and will be discharged into the clean sewage discharge system for recycling. During the operation of civil coke oven gas tank, industrial solid waste is produced when the packaged absorbent in the purifying station is changed once every two years. The absorbent will be treated for recycling in the coking plant after it is absorbed and no absorbent is discharged.

3.3.4 Analysis on Process Flow for Converter Gas Tank and Pollutant Producing Process 3.3.4.1 Process Flow

oil pump station

Pipeline water seal of the civil coke oven gas tank area

coke oven gas (water seal) gas tank

Field flushing of the civil coke oven gas tank area

civil coke oven gas compresser

civil coke oven gas purifying

device

civil coke oven gas user



48

Figure 3.3-4 Process flow for converter gas tank and the pollutant producing process Figure 3.3-4 shows the process flow for blast furnace gas tank. Wiggins tank is characterized by its storage of gas with high dust content and rapid moving of the piston. The converter gas tank can continuously provide gas to the users with discontinuous collection of converter gas. Besides, gas collected in different time can be mixed completely in the tank, making the content of the gas delivered more even and stable. The coke oven gas comes out via the main coke oven gas pipe within the tank area and enters the gas tank, where the gas is mixed completely. The gas for supply has a dust content of 100mg/m3, which cannot meet the users’ requirements and has to be dedusted before delivering to the user. 3 wet horizontal plate explosion-proof electrostatic precipitators are provided for the system (2 for use and 1 for standby). The dedusted converter gas has a pressure of 2~2.5kPa, and shall be pressurized to proceed to the gas mixture. The pressured converter gas, after mixture in the gas mixing station, can be supplied to the users of gas mixture.

3.3.4.2 Pollution-producing links: Base on The Approval Report of the New Gas Tank Area Project of the Shanguan Iron & Steel Group Limited Company of Guangdong Province(Nov.2005) by the Central Environmental Monitoring Station of Guangdong Province, we can know that: The coke oven gas emits no waste gas under normal conditions. Only when there is gas leakage under abnormal conditions will gas be emitted via safety gas release pipe. The major pollutants are carbon monoxide, hydrogen, nitrogen and hydrocarbons. Certain quantity of vapor may be produced in the electrostatic precipitator. The wastewater produced in the gas tank, including seal water from the gas tank body, dust containing wastewater produced from the converter electrostatic precipitator, the blue dust wastewater under the tank bottom, and the flushing wastewater from the tank area, etc. will be discharged into the wastewater treatment plant in No.3 Steel Plant for treatment.

3.3.5 Analysis on pollutant producing process of other tank area Water sealing shall be arranged along the pipeline in the tank areas of the project and it is sure to produce phenol containing wastewater. Meanwhile, 20 sets of gas drainers shall be arranged in the whole tank area. When the moisture is saturated in the gas, condensate water will be produced and drained through the drainers. Both are phenol containing wastewater and will be discharged into the wastewater treatment plant in the coking plant for treatment.

3.4 Analysis on the Pollution Source Strength during Operation of Tank Area

3.4.1 Air pollution sources (1) Organized emission Base on The Approval Report of the New Gas Tank Area Project of the Shanguan Iron & Steel Group Limited Company of Guangdong Province(Nov.2005) by the Central Environmental Monitoring Station

Converter gas tank Gas tank body

Electrostatic precipitator Pressurization

stationGas mixing station

W4

W4

Pressurization station of mixed

gas

No. 3 Steel Plant for recycling and reuse.

Mixed gas user

W19 W18

G4



49

of Guangdong Province, we can know that: The blast furnace gas tank, industrial coke oven gas tank, civil coke oven gas tank and converter gas tank in the project do not emit waste gas under normal conditions. Only when there is gas leakage under abnormal conditions will gas be emitted via safe gas release pipe. Therefore, under normal conditions, there is no organized emission of waste gas from the project.

(2) Inorganized Discharge In the project, the POC new-type Dry Gas Tank adopts the sealed oil, and the Wiggins Gas Tank adopts rubber seals. The gas piston system is automatically adjusted with gas volume. Under normal working conditions, the gas tank body will not emit disordered waste gases. When gases pass in and out the tank through pipes/valves, gas fugitive emission generated in pipe joint valves/pressure machines in pressure station/mixed gas system. The gas tanks and their throughputs in operation in SISG have been investigated. Amount of fugitive emission of CO in the project is presented in Table 3.4-1a. The disordered gas fugitive emission of the project is 15.86kg/h, totally 138.9t/a. As the major composition of the gas is CO, which has the highest toxicity and can cause the highest effect on the environment, while other non-methane content that can affect the air quality in the gases is not more than 2%, analysis and statistics are carried out only on CO. H2S is contained in coke oven gas and blast furnace gas, and both with an amount of 200 mg/m3. For high toxicity of H2S（LC50为518mg/m3）, valves/joints are adopted in the transporation. Amount of fugitive emission of H2S in the project is presented in Table 3.4-1b.

CO content (%) Main parts of fugitive emission Discharging Amount kg/h Blast furnace gas tank 26.3 Pipeline valves/joints 1.337 Industrial coke oven gas tank 6.9 Pipeline valves/joints 0.117 Civil coke oven gas tank 6.9 Pipeline valves/joints 0.035 Converter gas tank (2 sets) 67.5 Pipeline valves/joints 1.830 Other facilities Booster machine, mixing

equipment, pipeline valves/joints 1.107

Total 4.426 Table 3.4-1a The amount of fugitive emission of CO in the tank area

*note: other equipments include the pressuring machines at the pressuring station, the mixing systems of the mixing stations and the valves/fittings for the pipes.

H2S content mg/Nm3

Main parts of fugitive emission Discharging Amount kg/h

Blast furnace gas tank 200 Pipeline valves/joints 81.32 Industrial coke oven gas tank 200 Pipeline valves/joints 27.11

Civil coke oven gas tank 200 Pipeline valves/joints 8.15 Other facilities 200 Pipeline valves/joints of blast

furnace gas and coke oven gas 53.32

Total 16.99g/h Table 3.4-1b The amount of fugitive emission of H2S in the tank area

3.4.2 Pollution Resources According to engineering analysis, in normal working conditions, industrial wastewater of the gas tank area mainly consists of oily wastewater generated during operation of blast furnace gas tanks, phenolic wastewater and naphthalin wastewater generated by coke oven gas tanks, dusty wastewater generated during operation of converter gas tanks, domestic wastewater of the staff and initial rain water, etc. Pollutant

points Output Treatment amount in

phenolic wastewater treatment plant

Remarks



50

W1 Cooling spray water

26280 / Collected and treated by the SGIS clean sewage system for recycling

W2 The gas tank body

560 560

W3 Separating water from the oil pump station

3153.6 3153.6

Collected and treated by the wastewater treatment plant in the coking plant for recycling

W4 Pressurization station of mixed gas

2628 / Collected by the clean sewage system in the plant area for recycling

W5 Pipeline water seal water

37.5 37.5


W6 Site washing 38.4 38.4

Collected and treated by the wastewater treatment plant in the coking plant for complete recycling

W7 Purification station

240 240 Naphthalin containing wastewater is collected and treated by the wastewater treatment plant in the coking plant


120 120

W9 Oil pump station

2102.4 2102.4

Collected by the wastewater treatment plant in the coking plant for treatment

W10 Coke Oven Gas Pressurization station


W11 Pipeline water seal water

21.5 21.5




W13 Purification station

240 240 Naphthalin containing wastewater is collected and treated by the wastewater treatment plant in the coking plant


120 120

W15 Oil pump station

1051.2 1051.2

W16 Pipeline water seal

7.5 7.5






W19 Electrostatic precipitation

525600 / Collected and treated by the wastewater treatment plant of No.3 Steel Plant for recycling.

Converter gas tank

W20 Site washing 38.4 38.4 Other production water

W21 Water seal for the whole gas

pipeline

300 300 Collected by the wastewater treatment plant in the coking plant for treatment



51

consumption W22 Water supple by the drainer

35040 35040

Domestic wastewater

6816.375 6816.375 Manpower in the tank area is 83. Calculation is based on a water consumption quota of 250L/person and a discharge amount of 90%.

Initial Rainfall

1450 1450 Collected by the wastewater treatment plant in the coking plant for treatment

Total 629177.7 51413.68 Wastewater generation amount is 629177.7m3/a, including 52164m3/a of clean sewage (collected by the clean sewage system in the plant area for recycle), 525600 m3/a of dusty wastewater (collected and treated by the wastewater treatment plant of No.3 Steel Plant for recycle), 3789.5 m3/a of oily wastewater (no naphthalin contained, mainly generated in the blast furnace gas tank area, collected and treated by the wastewater treatment plant in the coking plant for recycle), 480t/a naphthalin containing wastewater, which is collected by the wastewater treatment plant in the coking plant, 38877.8m3/a of phenol containing wastewater (also including the oily wastewater, generated from the coke oven gas tank and other water consumption in production, recycled after treatment), 6816.375 m3/a of domestic wastewater (recycled after treatment) and 1450 m3/a of initial storm water (oily wastewater). Wastewater collected by the wastewater treatment plant in the coking plant is 51413.683/a in the project.

Table 3.4-2 Summary of production water pollution sources of the project (Unit: m3/a) Name of the wastewater

Generation quantity (m3/a)

Pollutant concentration (mg/L)

Discharge rules

flow direction

Oily wastewater

3789.5 Petroleum≤200, COD≤600

Discontinuous Collected and treated up to standard by the blast furnace wastewater treatment plant for recycling

Phenolic wastewater

38877.8 Petroleum≤150, COD≤600, volatile naphthalin≤12.5

Discontinuous

Naphthalin wastewater

480 Discontinuous

Collected and treated up to standard by the wastewater treatment plant in the coking plant for recycling

Dusty wastewater

525600 Petroleum ≤80, COD≤400, SS≤600

Continuous The sewage is sent to the wastewater treatment plant for treatment and enters the turbid water system

Domestic wastewater

6816.375 Ammonia & nitrogen ≤30, COD≤300, SS≤300

Continuous

Initial Rainfall

1450 Petroleum ≤50, COD≤200, SS≤250

Discontinuous

Clean sewage

25310 SS≤50

Total 577013.7 Pollution loads of all kinds of pollutants: petroleum 48.71t/a; COD: 238.18/a; ammonia & nitrogen 0.21t/a; SS: 317.77t/a; hydroxybenzene: 0.486t/a

Table 3.4-3 Summary of the wastewater produced in the project and the pollution factors * naphthalene containing wastewater delivered out for treatment is not included in the table.



52

Petroleum COD Ammonia Nitrogen SS Phenol Remarks

Concentration before

treatment 200 600

Amount before

treatment 757.9 2273.7

Concentration after

treatment 5 100 15 70 0.5

Amount after treatment 18.9475 378.95

Oily wastewater

Reduction amount 738.9525 1894.75

The sewage attains level 1 after

treatment


treatment 150 600 12.5

Amount before

treatment 5831.67 23326.68 0 0 485.9725

Concentration after

treatment 5 100 15 70 0.5

Amount after treatment 194.39 3887.78 19.44

Phenolic wastewater

Reduction amount


treatment


treatment 80 400 600

Amount before

treatment 42048 210240 315360

Concentration after

treatment 5 100 15 70 0.5

Amount after treatment 2628 52560 36792

Dusty wastewater

Reduction amount 39420 157680 0 278568

Reuse after

treatment



Amount before

treatment 2044.9125 204.49125 2044.9125

Concentration after

treatment 5 100 15 70 0.5

Amount after treatment 681.6375 102.24563 477.14625

Domestic wastewater

Reduction amount 1363.275 102.24562 1567.7663


treatment and is reused



53



Amount before

treatment 72.5 290 362.5

Concentration after

treatment 5 100 15 70 0.5

Amount after treatment 7.25 145 101.5

Initial Rainfall

Reduction amount 65.25 145 261


treatment

Amount before

treatment 48710.07 238175.29 204.49 317767.41 485.97

Amount after treatment 2848.59 57653.37 102.25 37370.65 19.44

Total

Reduction amount 45861.48 180521.93 102.25 280396.77 466.53

Table 3.4-4 The water quality and amount of pollutants discharged after being treated by the treatment facility in the plant

Initial Rainfall Storm intensity is calculated according to the following equation: Where: q is the storm intensity, l/s*hm2; p is the return period (the design rainfall return period P=2a), In the above formula, the assuming Infiltration Coefficient is 0.6, the Average Precipitation is 1638mm, Rainwater Accumulation Area is 15000m2 and the Annual Rainwater Accumulating Days is 151, then the Regional Rainwater Discharges in the Initial Operational Period of the project is 1450m3 or so. Its pollutants are mainlypetroleum, CODCr and SS.

The Initial Ground Rainwater shall be unifiedly discharged to the Factory Sewage Treatment Field after being collected and they shall be discharged only when reaching the discharging standards. According to the design of the integrated wastewater treatment plant of 9×104m3/d of SGIS, it is recommended that during the construction of the wastewater treatment plant, the wastewater be discharged into the coking wastewater treatment plant and be used as the supplement of the blast furnace slag flushing water when treated to meet the standard. (3) Domestic wastewater Domestic wastewater The personnel quota in the tank area is 83, and according to Water Flow Norm of Guangdong Province, the water flow norm is chosen as 250L/person·day in the calculation. The Sewage Discharges is calculated as 90% of the Water Consumption. The daily living discharged sewage is 7.2m3, mainly containing COD, BOD5 and SS with the condensation respectively as COD250mg/l and BOD5150mg/l. The wastewater produced by the 83 employees in the project is 6816.375 m3/a, which will be discharged into the coking wastewater treatment plant and be used as the supplement of the blast furnace slag flushing water when treated to meet the standard. According to Table 3.4-2~3.4-4, the clean sewage produced in the tank area will be discharged into the clean sewage system for recycling, the dust wastewater will be discharged into wastewater treatment plant in No. 3 Steel Plant and be recycled after treatment while the oily wastewater and phenol wastewater will be discharged into the coking wastewater treatment plant for treatment. When it meets Class 1 stand, it will be discharged into Phenol-Cyanogen Wastewater Treatment Station and will be used ad the supplement of blast furnace slag flushing water when treated to meet the standard.



54

The capacity of the Phenol-Cyanogen Wastewater Treatment Station is 2000m3/d, and a new Phenol-Cyanogen Wastewater Treatment Station with capacity of 2400m3/d will be built to meet the demand of 6m coke oven.The total amount of wastewater produced in #4 and #5 coke ovenss is 720m3/d, and the phenol-cyanogen wastewater produced in the 6m coke oven is expected to be 1008m3/d. The excessive capacity of the wastewater treatment station is 2400m3/d, while the wastewater discharged into the wastewater treatment plant in the coking plant from the tank area is 50933.68t/a, i.e. appropriate 140t/d. Therefore, the wastewater treatment plant can treat the wastewater produced in the tank area.

3.4.3 Solid Waste The industrial solid waste produced during the operation of the project are mainly from: (1) The 140t of S2 absorbent replaced in the civil coke oven gas purifying station at one time (once every two years). 50t/a of it is desulfurizing agent and will be sent to the coking plant for recycling, and appropriate 90t/a are ceramic ball packing, CAN-110 CAN-229 and will be recycled by the manufacturer. There is no discharge of waste. (2) The 75t of S2 absorbent replaced in the industrial coke oven gas purifying station at one time (once two years). 30t/a of it is desulfurizing agent and will be sent to the coking plant for recycling, and appropriate 45t/a are ceramic ball packing, CAN-110 and CAN-229 and will be recycled by the manufacturer. There is no discharge of waste. The sludge produced in the wastewater treatment is covered in the impact assessment of the relevant wastewater treatment plant. The personnel quota in the tank area is 83, and the domestic waste produced amounts to 16t/a.

3.4.4 Noise The noises from CDQ project are mainly mechanical noises and aerodynamic noises. The main noise sources are: pressure machine, dedusting fan, pumps and such exhaust devices as safety valve of tank dispersing pipe. Normally, before taking noise control measures, the strengths of main noise sources are over 85dB (A).detail in Table 3.4-5

No.: Noise Sources Source

Intensity dB(A)

Controlling Measures Noise amount dB(A)

1 Gas pump 93 Mufflers 30

2 Compressor 95 Mufflers, Damping Materials, Sound-isolation 30

3 Dust removing blower 91 Mufflers, Sound-isolation 30 4 Oil pump station 87 Damping, Sound-isolation 25 5 Cooling tower 85 Urban, Semi-sealing 25

Table 3.4-5 The strength of noise sources of equipments in the project and the relevant control measures dB(A)

3.4.5 Statistics and Analysis of Abnormal Discharging Source Intensity When a gas tank reaches its maximum stroke due to production abnormity of the upstream devices of the gas tank (the release towers for the blast furnace gas pipes and coke oven gas pipes/converters), the change in the gas flow rate, the tank will release the excessive gas through the safety release pipes on top of the gas tank with the automatic control devices. Ever since the operation of the gas tanks in SGIS, no accident of this kind occurred. According to the experience data of the Institute, this kind of accident under abnormal conditions occurs once every 6~8 years, with a release volume equivalent to the 10~30s of flow of the relevant gas tank (which is calculated as 30s here). As the storage pressure of the gas tank is far lower than the external pressure, the release lasts about 30min, a fairly long time. The emission sources under abnormal conditions every time are listed in Table 3.4-6.



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No.:

Location of sewage

discharge outlets

Emission rate in m3/s

Emission amount m3/time

Discharging height

1 Blast furnace gas tank G1 0.93 1670 121

2 Industrial coke oven gas tank G2 0.32 584 83

3 Civil coke oven gas tank G3 0.05 84 65

4 Converter gas tank (2 sets) G4 1.39 2500 50

Total 4838 50

Table 3.4-6 The abnormal emission source of the project *Note: under abnormal conditions the gas tanks release the excessive gas via the safety release pipes, the height of which is as high as or a bit higher than the that of the relevant gas tank.

According to Tables 3.1-1~3.1-5, it is found that the content of CO in the gas is the highest, and CO may cause much hazard to the environment as shown in Table 3.4-7.

CO Emission rate (g/s) 305.03 Blast furnace gas tank Emission amount (kg) 549.045 Emission rate (g/s) 27.98 Industrial coke oven gas tank Emission amount (kg) 50.379 Emission rate (g/s) 4.03

Civil coke oven gas tank Emission amount (kg) 7.245 Emission rate (g/s) 586.41 Converter gas tank Emission amount (kg) (two) 2111.063

Table 3.4-7 The amount of CO in the gas released from the gas tank under abnormal conditions

3.4.6 The collecting table of pollutants during operation

Main pollutants indicators Unit Output Reduction

amount of the enterprise

Discharge amount

Discharge amount

Wastewater Quantity

10,000 m3

/a 602323.7 0

SS t/a 317.77 280.40 0 COD t/a 238.18 180.52 0

Petroleum t/a 48.71 45.86 0 NH3-N t/a 0.21 0.11 0 Production

Wastewater

Phenol t/a 0.486 0.467

0

The oil containing

sewage, hydroxybenzene

containing sewage, domestic

wastewater, preliminary rain water and dust

containing wastewater is all

reused. Waste gas

amount ×m3/a 29028 / Exhaust Gas

CO (unorganized

emission) t/a 38.763 / 38.772



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H2S

t/a

0.148

0.148

Industrial Solid Waste

Industrial solid wastes are derived from the sorbent replacement in the gas purification stations of industrial coking ovens, purification stations of civil

coking ovens. A total of 215 tons of wastes are produced each time, and replacement is carried out once every two years. All the wastes are recycled and

reused instead of being released. Solid Waste

Domestic waste

About 16 tons of wastes are produced annually, which are collected and transferred and sanitarily buried by the environmental department.

Noise The noise sources are stamping gas pumps (90-95 db(A)), oil pumps (86-90 dB(A)), cooling towers (83-87 dB(A)) and pressurizers (92-96 dB(A)).

Table 3.4-8 “Three Waste” Summary in Project Operating Period



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4 General Environment in Project Surrounding Area

4.1 Natural Environment

4.1.1 Geographical Location SGIS is located at 2~3km east of Maba Town, Qujiang County of Guangdong Province, and 14km away from Shaoguan City. Geographic coordinates for the site is longitude 113º19' east and latitude 24º43' north. The plant area is bordered by Yanshan Mountain to the south, Lianhua Mountain to the north, Maba Town of Qujiang County to the west, and Mashanding to the east. The site is located in a valley plain with the trend of “northeast to southwest” in the tributary ditch of Meihua River. 4.1.2 Topography The previous topography of the plant area is generally higher in south and lower in north, with a height mark of approximate 70m. Height mark of the valley plain is in the scope of 90~110m, with 200m higher than that of Mashanding, 150m higher than that of the Yanshan Mountain and 120m higher than that of the Lianhua Mountain. The surrounding topography of the valley plain is complicated, with Guanshan Mountain to 10km of its east, a volcano to 10km of its north and the alpine group to 10km of its southwest. The plant area is neighbored with Hengguang railway line and Maba station to the southwest, and could be reached by the private railway line for enterprises. The factory area is elongated, long in east-west and narrow in south-north, with an occupied area of 7.8km2. 4.1.3 Geology Geological structure of the plant area is extremely complicated. The surface soil consists of Quaternary loess, brown mild clay, mild sand clay and gravel with sand inclusion. The lower layer are mainly lime system, permian limestone, large karst (Karst) and developing fault. 4.1.4 Hydrology The proposed construction project is located in midstream and upstream of Meihua River, which flows to the west and meets with Maba River at 7km far away, and is combined with the Baitu River Segment at midstream of the North River in Qujiang County. Average flow of the Meihua River is approximately 3m3/s. As the second largest water system of Pearl River Basin, North River has a catchment area of 46710km2, accounting for 10.3% of that of the Pearl River Basin. 92% of the basin area is located in Guangdong Province. Main river of the North River starts from the fountainhead and ends in Sixianjiao and flows into the West River, with a whole length of 468km and an average falling slope of 0.26%. North River starts from south of the fountainhead and ends in Shazhouwei in Shaoguan City and is combined with the Wujiang River. The upstream segment of North River is named as Zhenjiang River, which starts from the fountainhead and ends in Shazhouwei, with a whole length of 212km and an average falling slope of 0.59‰. After flowing into the Wujiang River, the North River is turned to south and combined with South Water at Mengzhou Dam, then flows to south and combined with Wengjiang River in Yingde County. The average flow of North River Basin (Sixianjiao) in over years is 1620m3/s, average flow in high water period is 2520m3/s and average flow in low water period is 714m3/s. Average flow of the Baitu River section (with the catchment area of 16750km2) nearby the project area in over years is 467m3/s, average flow in high water period is 697m3/s and average flow in low water period is 236m3/s. The average flow in 95% of the low water years is 210m3/s and the average flow in the driest period (in January) in over years is 170m3/s. The average flow in the driest month of 95% of low water years is 97m3/s and the monthly flow in 95% of the driest month is 77m3/s. Xiaokeng Reservoir is located at 42km northeast of the plant area, which is a multi-functional reservoir for water supply in agricultural irrigation, aquiculture and poultry and power generation industry. Catchment area of the reservoir is 139km2, the designed standard water level is 225m (with a relevant reservoir capacity of 53,350,000m3), and the designed flood level is 227m (with a relevant reservoir capacity of 6092m3).



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4.1.5 Climate The site is located in area of subtropical monsoon climate, and the cold and warm air mass from the north and south usually gather here as a result of the influence caused by the Nanling Mountain Range, thus the climate characteristics are as follows: continued rain in spring, ample rainfall in summer, fresh air and warm in autumn while cold and dry in winter. The average temperature in over years is 20.1. The average temperature in July in summer is 28.9 with highest temperature of 42. The average temperature in January is 9.5 with lowest temperature of －4.3. Frost seldom appears in winter (approximately 4 days in a year). The annual average precipitation amount is 1638mm. Storm is intensive in a year with the rainy seasons from April to September, accounting for over 80% of the annual precipitation amount. The annual average relative humidity is 74.5%. Hours of sunshine are approximately 1473~1928 hours. North wind prevails in autumn and winter, south wind prevails in spring and summer, and south wind is dominant in a year. Static wind is frequent. The annual average wind speed is approximately 1.7m/s in over years in this area.

4.1.6 Vegetation and Soil Vegetation in Shaoguan City has the characteristics of gathering from the north and south as a result of its geographic location, geologic structure and climate conditions, belonging to subtropical evergreen broad-leaved forest. The covered categories and ecological structures are mainly subtropical evergreen species, and some tropical and subtropical species are also included. Plant resources in Shaoguan City are in diversity, and plants in this area mainly include Fagaceae, Lauraceae, Theaceae and anil. The artificial cultivated fruit trees are peach, plum, sand pear, citrus, chestnut tree, etc. Main categories of soil include granite, sand shale, and red earth and paddy soil developed from the Quaternary red earth, as well as the terra rossa and acidic purple soil. Vegetation surrounding the plant site mainly include Chinese silvergrass, Chinese francolin, Baeckea frutescens community and artificial cultivated rice, vegetables, cassava and peanut, etc. Soil are mainly sand shale red earth and Quaternary red earth, and river sandy fields are distributed next to the riverside. 4.1.7 Aquatic organism resources and fishery resources Based on the data provided by the aquatic department, aquatic organism has a large diversity in North River, including 302 categories of phytoplankton, which belongs to seven phylums and 106 genus and are mainly Chrysophytax, Chlorellin and Cyanophyta, and including 99 categories of zooplankton (mainly the protozoan), and also including 73 genus and 85 categories of benthonic mollusks. Based on relevant data, there are 143 categories of natural fish in North River, including 45 categories of primary economic fish. Dominant fish with the biggest capture quantity include carp, mud carp, crucian carp,yellow alligator, Spinibarbus caldwelli, Varicorhinus, red-eye trout, loach, eel and four major Chinese carps. Since 1960s, for large amount of industrial wastewater and pesticide residues entering into North River, the water are polluted. And for random capture over years, the capture amount is very low. In addition, based on data from the aquatic department, there is no valued fish or fish that require special protection in the assessed river section. 4.1.8 Natural landscape There are a national autonomous county and a national autonomous town in Shaoguan City, as well as 4796 natural villages in 99 towns. Many landscape of tourism resources with high taste and based on the national and provincial evaluation, famous sites here include Danxia Mountain in the world physiognomy and Nanhua Buddhist Temple of the south zen. The Chebaling National Nature Reserve in Shixing County is the present habitat of south China tiger, also the treasury of plant categories. Multiple wild life could be found in the NanLing National Park in Ruyuan. The first cave in Ruyuan is Tongtianluo and the first mountain peak is Shikengqiang (1902m) also located in Ruyuan, which is the highest mountain peak in Guangdong Province. Tourist attractions include the Jinjiling and Jiulong Shibatan in Pingshi of Lechang. The seven sites above mentioned are national level. There are eleven provincial scenic spots, e.g. the ancient cultural relics site of Lion’s Crag, Yunmen Temple (the origin place of Yunmenzong), Jinshiyan Nunnery, Meiguan Zhonggu Rock, Shaoguan Furong Scenic, Nanxiong Zhuji Lane and Shaoguan Fengcai Building, etc. The water surface area of Nanshui Lake in Ruyuan is 55000mu, and the reservoir capacity is 1.2 billion m3. In addition, there are hotspring sanitaria districts, including Qujiang Fengwan, Xiaokeng and



59

Lechang Longshan, etc. There are two relics sites in the assessed area, the Nanhua Temple and Shizi Rock. 4.2 Society and economy Shaoguan is the heavy industrial city of Guangdong Province, with strong industrial foundation, and adequate development for its agriculture and the tertiary industry. In 1950s, 1960s and 1970s, Shaoguan had been under construction as the heavy industrial base and strategic foundation for Guangdong Province. A large amount of major industrial enterprises including Shaoguan Steel Plant, Shaoguan Smelting Plant, Shaoguan Digging Machine Plant, Fankou Lead-zinc Mine, Dabao Mountain Mine and Quren Coal Mine, etc. were built here, helping the Shaoguan industry act as a foundation of the local economy. In 1970s, Shaoguan became the important industrial base of Guangdong Province. Since 1980s, Shaoguan industry got a further development. There are over 21000 industrial enterprises in Shaoguan City. It has formed major industries consisting of the resource-type industries including the excavation, nonferrous smelting, iron and steel industry, forgings and castings, and construction materials; a processing industry with five major industries of mechanical manufacture, light industry, textile, petroleum and chemistry, and electric power; the high and new technology industry with major industries of electronic information technology, electromechanical integration, new materials and pharmaceutical industry. Wherein, annual production of steel in SGIS Group has exceeded 5 million tons and SGIS Group has been one of the Top-100 steel and iron enterprises in the world. Shaozhu Group is one of the biggest professional enterprises for forge piece manufacturing. In the equipment industry, there are large-scale enterprises including Xinyu Company, engineering machine plants and Zhongli Company involved in the manufacturing of large-sized construction machines, overhead working truck and large-scale water-turbine generator set. In recent years, the economy of Shaoguan City has developed rapidly, and the increment speed is higher than the average speed of that in China. In 2006, the total regional output value is 39.383 billion RMB, with a growth of 12.4%, and the growth rate is 2.5% higher than that of the last year. Wherein, the output value for the primary industry increased with 6.304 billion RMB, with a growth of 3.4%; the output value for the secondary industry increased with 17.419 billion RMB, with a growth of 15.4%; and the output value for the tertiary industry increased with 15.660 billion RMB, with a growth of 13.2%. Calculation based on the residential population shows that the average output value is 13460RMB/person, with a growth of 11.5%. The proportion of three industrial structures was adjusted to 16.0:44.2:39.8 from the 17.5:42.5:40.0 in 2005. The primary industry decreased by 1.5% and the secondary industry increased by 1.7 %. The total agricultural output in the year was 10.583 billion RMB, with a growth of 3.4%. Wherein, the planting industry increased with 2.9%, the forestry increased with 7.8%, the livestock farming increased with 2.9%, and the fishery industry increased with 4.7%. The sowing area of grain in 2006 is 2.587 million mu, with a growth of 1.9%. The planting area of sugar-cane is 75200 mu, with a growth of 24.4%; the planting area of oil is 65200 mu, with a decrease of 1%; the planting area of tobacco is 270200 mu, with a growth of 14%; and the planting area of vegetation is 1.494 million mu, with a growth of 1.5%. The industrial growth value in 2006 was 15.522 billion RMB, with a growth of 15.7%, which had a direct contribution rate of 47.5% to the economic growth in the year. Growth value for scaled industries is 13.628 billion RMB, with a growth of 16.0%. Wherein, the growth value for the state owned and state controlled industries is 9.823 billion RMB, with a growth of 14.1%; the growth value for foreign and Hongkong & Macao & Taiwan industries is 2.296 billion RMB, with a growth of 16.4%; the growth value for joint stock industries is 7.8 billion RMB, with a growth of 25.2%, and the growth value for the private industries is 1.69 billion RMB, with a growth of 18.0%. The growth value for light industry in the year is 3.207 billion RMB, with a decrease of 1.2%, and the growth value for heavy industry is 10.421 billion RMB, with a growth of 22.5%. The growth value for county industries is 5.456 billion RMB, with a growth of 18.3%. Growth value for three major industries including tobacco, metallurgy and electric power is 9.86 billion RMB, with a growth of 19.0%. Wherein, the tobacco industry increased with 11.0%, the metallurgy industry increased with 21.5% and the electric power industry increased with 22.2%. There was one provincial-level priority engineering technology research and development center, six high & new technology enterprises recognized by Guangdong Province and fifteen provincial-level private scientific and technical enterprises in Shaoguan City by the end of 2006. In 2006, total 81 achievements were realized in scientific research, in which 3 achievements obtained the award of Scientific & Technological Progress of Guangdong Province, and 66 achievements obtained award of Scientific & Technological Progress of



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Shaoguan City. Eight “Torch Plans” were implemented in the year, including 5 national plans. Forty “Star-fire Plans” were implemented. There were 461 patents and 225 patent authorizations in the city, with an increase of 52.1% and 97.4% respectively. The residential population of the city by the end of the year was 3203200, with an increase amount of 16600. Including 1258800 non-agricultural population and 1944400 agricultural population. The birth population of the year was 37300, with a birth rate of 11.67%. And the death population is 16800, with a death rate of 5.27‰. Population of the city by the end of the year was2929400, with an increase amount of 6800.



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5 Assessment of the Existing Baseline Environmental Quality In 2006, monitoring and investigation of the existing baseline environment of ambient air, water environment and soils surrounding the SGIS was carried out by our Institute for the environmental impact assessment of five technical renovation projects of the iron-smelting plant of SGIS. And the gas tank project is located in a same company with the five technical renovation projects. So, the assessment mainly uses the existing baseline monitoring data from the EIA Report of five technical renovation projects of the iron-smelting plant of SGIS (March 2007). Existing baseline of the noise environment is monitored by the monitoring station of SGIS based on the project site selection. 5.1 Existing Baseline Survey and Assessment of the Ambient Air Quality

Existing baseline of ambient air quality is based on the existing baseline monitoring data from the EIA Report of five technical renovation projects of the iron-smelting plant of SGIS (March 2007).

5.1.1 Monitoring point Based on the functional characteristics of the sensitive points of ambient air in the assessed area, monitoring locations are arranged in representative villages and school. Seven monitoring locations are selected, including the 1# plant site, 2# Shaogang No.1 Middle School, 3# Meihua Village, 4# Xin Village, 5# Maba Town, 6# Nanhua Temple and 7# Shanzibei. Name and location of the monitoring locations are shown in Table 5.1-1. Monitoring locations are presented in Figure 5.1-1

Monitoring point Objective Location Distance from the

project(m)

Atmospheric Function Zone Object

1# Plant Site of 7# blast furnace SE 800 Area of Class

III Employee

2# Shaogang No. 1 Middle School SW 2900 Area of Class

II Students

3# Meihuazhai Village NE 3750 Area of Class

II Residents

4# XinZhai SE 6300 Area of Class II Residents

5# Maba Town SW 7900 Area of Class II Residents

6# Nanhua Temple S 10000 Area of Class II Tourists

7# Shanzibei WN 400 Area of Class II Residents

Table 5.1-1 Monitoring locations for ambient air



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Fig 5.1-1 Distribution of Soil Monitoring Points



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5.1.2 Monitored items Based on the discharge characteristics of air pollutants and the surrounding environmental characteristics, the air monitoring parameters for this assessment include PM10, TSP, CO, SO2 and NO2. Observation on normal meteorological factors including ground wind direction, wind speed, air temperature and air pressure is carried out in the monitoring period. 5.1.3 Monitoring Time and Sampling Frequency Carry out existing baseline monitoring and sampling in continuous five days on August 11~15, 2006. CO, SO2 and NO2 are sampled with four times each day. The sampling is carried out with four times at Peking time 7:00~8:00, 11:00~12:00, 14:00~15:00 and 17:00~18:00, with 60 minutes for each sampling. Sampling for daily mean concentration should be at least 12 hours in a day. Five days continuous monitoring is carried out for TSP and PM10, sampling with one time, and the sampling time should be at least 12 hours in a day. It’s sunny with gentle wind in the monitoring period, with the wind speed of approximately 0.2~1.2m/s. 5.1.4 Monitoring and analysis method Sampling and analysis methods for air pollutants should be standard methods in accordance with the Monitoring and Analysis Methods for Air and Exhaust Gas (1990) issued by the Ministry of Environmental Protection of the People’s Republic of China. Relevant methods are listed in Table 5.1-3.

No.: Name of the sampler Model 1 Portable aerovane FYF-1 2 Aneroid pressure meter DYM3 3 Air sampler TH-110B 4 Intelligent sampler for TSP with medium flow KC-120H 5 Impact cutter for PM10 with medium flow PM10-100 6 Constant temperature and flow air continuous sampler BX2400

Table 5.1-2 Name of the sampler

Items Basis for the monitoring method Monitoring instrument

Minimum limit of

identification Absorbable

particles GB/T16157—1996 AB204－N electronic balance

0.001

Total suspended particulate

(TSP)

GB/T16157—1996 AB204－N electronic balance

0.001

Sulfur dioxide GB/T15262—1994 722 Grating

spectrophotometer 0.003

Nitrogen dioxide GB/T15435—1995 722 Grating

spectrophotometer 0.005

Ambient air (mg/m3)

CO GB9801—88 Infrared carbon

monoxide analyser

0.12

Table 5.1-3 Monitoring and analysis method for air pollutants



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5.1.5 Existing Baseline Assessment of Ambient Air Quality

5.1.5.1 Assessment Standards In the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). Detailed information is presented in Table 1-3 and Table 1-4 in Chapter 1 5.1.5.2 Existing Baseline Assessment of Ambient Air Quality The monitoring results for hourly and daily mean concentration of NO2, SO2, CO, TSP and PM10 are summarized in Table 5.1-4. Monitoring results for each monitoring index are analyzed as below:

Statistic items Hourly average value in 1 hour Daily average value Pollutants

Monitoring point Concentration

scope (mg/m3)

Over-standard rate (%)

Concentration scope

(mg/m3)


1# plant site / / 0.070~0.083 0 2# Shaogang No.1

Middle School / / 0.037~0.060 0

3# Meihua Village / / 0.025~0.045 0 4# Xin Village / / 0.077~0.080 0 5# Maba Town / / 0.072~0.081 0

6# Nanhua Temple / / 0.065~0.087 0

Absorbable particles

7# Shanzibei / / 0.032~0.050 0 Value of Class III Standard(mg/m3) / / 0.15 ---- Value of Class II Standard(mg/m3) / / 0.25 ----

1# plant site / / 0.122~0.135 0 2# Shaogang No.1

Middle School / / 0.075~0.090 0

3# Meihua Village / / 0.057~0.077 0 4# Xin Village / / 0.122~0.130 0 5# Maba Town / / 0.117~0.132 0

6# Nanhua Temple / / 0.112~0.150 0

TSP：

7# Shanzibei / / 0.070~0.085 0 Value of Class III Standard(mg/m3) / / 0.3 ---- Value of Class II Standard(mg/m3) / / 0.5 ----

1# plant site 4.5~6.5 0 5.19~5.53 0 2# Shaogang No.1

Middle School 0.5~1 0 0.5~0.78 0

3# Meihua Village 1.13~2 0 1.35~2 0 4# Xin Village 0.5~1 0 0.5~0.78 0 5# Maba Town 1.13~2.25 0 1.57~1.82 0

6# Nanhua Temple 0.63~1.13 0 0.78~0.91 0

CO

7# Shanzibei 1.25~2.88 0 1.72~2.38 0 Value of Class III Standard(mg/m3) 10 / 4 ---- Value of Class II Standard(mg/m3) 20 / 6 ----


Middle School 0.019~0.052 0 0.022~0.041 0

3# Meihua Village 0.017~0.051 0 0.02~0.04 0 4# Xin Village 0.018~0.053 0 0.019~0.038 0

Sulfur dioxide

5# Maba Town 0.019~0.076 0 0.021~0.049 0



65

Statistic items Hourly average value in 1 hour Daily average value Pollutants

Monitoring point Concentration

scope (mg/m3)


Concentration scope

(mg/m3)


6# Nanhua Temple 0.018~0.055 0 0.022~0.041 0 7# Shanzibei 0.027~0.041 0 0.03~0.035 0

Value of Class III Standard(mg/m3) 0.5 / 0.15 ---- Value of Class II Standard(mg/m3) 0.7 / 0.25 ----


Middle School 0.020~0.039 0 0.020~0.037 0

3# Meihua Village 0.021~0.035 0 0.021~0.037 0 4# Xin Village 0.019~0.033 0 0.021~0.032 0 5# Maba Town 0.021~0.037 0 0.023~0.034 0

6# Nanhua Temple 0.021~0.052 0 0.024~0.037 0

Nitrogen dioxide

7# Shanzibei 0.025~0.034 0 0.026~0.030 0 Value of Class III Standard(mg/m3) 0.24 / 0.12 ---- Value of Class II Standard(mg/m3) 0.24 / 0.12 ----

Table 5.1-4 Monitoring results and assessment standard for current atmospheric environment quality in assessment area (mg/m3)

(1) Monitoring index for inhalable particles (PM10) In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). The table shows that the daily mean concentration of TSP is 0.025~0.087mg/m3. The maximum value is that of 6# Nanhua Temple in the monitoring period, with a concentration value of 0.087mg/m3, accounting for 58% of the Class II standard value. Concentrations of PM10 at all monitoring locations are lower than that of relevant standards regulated in the Ambient Air Quality Standard (GB3095-1996). It turns out that the concentration of TSP in the assessment area is lower. (2) Monitoring index for total suspended particulate (TSP) In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). The table shows that the daily mean concentration of TSP is 0.057~0.150mg/m3. The maximum value is that of 6# Nanhua Temple in the monitoring period, with a concentration value of 0.15mg/m3, accounting for 50% of the Class II standard value. Concentrations of PM10 at all monitoring locations are lower than that of relevant standards regulated in the Ambient Air Quality Standard (GB3095-96 revised in January 2000). It turns out that the concentration of PM10 in the assessment area is lower. (3) Monitoring index for carbon monoxide (CO) In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). Hourly mean concentration: variation range for hourly mean concentration of CO at each monitoring point in assessment area is 0.5~6.5mg/m3, in which the concentration of 1# factory site, 6.5mg/m3, is the highest and 33% of Level 3 standard value. Concentrations of TSP at all monitoring locations are lower than that of relevant standards regulated in the Ambient Air Quality Standard (GB3095-96, revised in January 2000). Daily mean concentration: variation range for daily mean concentration of CO at each monitoring point in assessment area is 0.5~5.53 mg/m3, in which the concentration of 1# factory site, 5.53 mg/m3, is the highest



66

and 92% of assessment standard. (4) Monitoring index for sulfur dioxide (SO2) In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). Hourly mean concentration: variation range for hourly mean concentration of SO2 at each monitoring point in assessment area is 0.017~0.078mg/m3, in which the concentration of 1# factory site, 0.078mg/m3, is the highest and 11％ of Level 2 assessment standard. Concentrations of TSP at all monitoring locations are lower than that of relevant standards regulated in the Ambient Air Quality Standard (GB3095-96, revised in January 2000). Daily mean concentration: variation range for daily mean concentration of SO2 at each monitoring point in assessment area is 0.019~0.053mg/m3, in which the concentration of factory site, 0.053mg/m3, is the highest and 21％ of Level 2 assessment standard.

(5) Monitoring index for nitrogen dioxide (NO2) In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). variation range for hourly mean concentration of NO2 at each monitoring point in assessment area is 0.019~0.052mg/m3, in which the concentration of 1# factory site, 0.052mg/m3, is the highest and 22％ of Level 2 assessment standard. Concentration of NO2 at all monitoring points is lower than relevant assessment standard value within the assessment area. Daily mean concentration: variation range for daily mean concentration of SO2 at each monitoring point in assessment area is 0.020~0.041g/m3, in which the concentration of factory site is the highest and 34％of assessment standard. In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). In the assessment area during the monitoring period, the hourly mean concentrations of NO2, SO2 and CO comply with the relevant assessment standards regulated in Ambient Air Quality Standard (GB3095-96, revised in January 2000). Except the daily mean concentration of CO in a point of 1# plant site is near and lower than the standard, the concentrations of all monitoring items in other monitoring locations are lower. Generally, the daily average value of PM10 and TSP is low in the assessment area. The monitoring value from each sensitive point could comply with relevant assessment standards. So it turns out that the existing baseline air quality in the assessment area is in good condition, which could meet relevant functional requirements.

5.2 Investigation of existing baseline of water environment quality Existing baseline of water environment quality is based on the existing baseline monitoring data from the EIA Report of five technical renovation projects of the iron-smelting plant of SGIS (March 2007).

5.2.1 Monitoring point Surface water monitoring point distribution According to the environmental conditions and the status of this Project the monitor sets up 7 water quality monitoring sections for sampling and analysis, among which, 3 sections are in Meihua River, i.e., upstream of Meihua River (S1), mouth of Meihua River (S2); 2 sections are in downstream of Maba River, i.e., before joining Meihua River (S3), after joining Meihua River (S4); 2 sections are in North River, i.e., before joining (S5), after joining (S7). For detailed information, see Table 5.2-1 and Figure 5.2-1



67

Section No. Location S1 Upstream of Meihua River

S2 Meihua River outlet,100m downstream of general drainage of Shaogang

S3 6000m downstream of general drainage of Shaogang S4 Maba River before Meihua River joins

S5 Maba River after Meihua River joins, 10000m downstream of general drainage of Shaogang

S6 Beijiang River Section before Maba River joins S7 Beijiang River Section after Maba River joins

Table 5.2-1 Distribution of Monitoring Sections

Fig 5.2-1 Distribution ofWater Monitoring Points

Underground water monitoring point distribution 1# Dayuantou Village, 2# No. 31, Yumachang, 3#Baoxishui, 4# Cheliao Village (Opposite Pingtian Village) and 5#Chenziyuan Village (Opposite Pingtian Village). For details, please refer to Monitoring point



68

distribution Figure 5.1-2.

5.2.2 Monitored items PH, SS, CODCr, arsenic, volatile phenol, petroleum-related substances, copper, lead, zinc, cadmium, sulfide, mercury, fluoride, cyanide, total nitrogen, total phosphorus, iron, BOD5 and water temperature, altogether 19 factors. Factors to be investigated of underground water: 11 factors including PH, Cr6+, mercury, arsenic, cyanide, volatile phenol, iron, copper, lead, zinc and total hardness. 5.2.3 Monitoring Time and Sampling Frequency Water monitoring started from March, 2006 and one sampling is taken for each section during each monitoring period. Regarding the sampling sections 1#-5# in Meihua River and Maba River, only one sample is taken in the middle of the River, and regarding the sampling sections 6#-7#, 2 samples are taken on the left and right side of the section. Water quality sampling and analysis are carried out in strict compliance with environmental monitoring specifications. 5.2.4 Monitoring and analysis method Methods specified in Environmental Quality Standard for Surface Water (GB3838-2002) are adopted for surface water, and regarding unspecified items, monitoring and analysis are carried out by using the recommended analysis methods in Environmental Monitoring Specifications produced by State Environmental Protection Administration. For all related analysis methods and their detection limit, see 5.2-2. The sampling and analysis of underground water are carried out with the methods specified in Environmental Quality Standard for Surface Water (GB/T14848-93). For the monitoring method of underground water and detection limit, see Table 5.2-2.

Items Basis for the monitoring method Monitoring instrument Minimum limit of

identification pH

(dimensionless) GB/T6920—1986 DF808ApH/Ionometer 0.02

Chemical oxygen demand

Fourth edition of Monitoring and Analysis Methods of Water

and Wastewater XJ-I Digestion Instrument 5

0.002 (surface water) Copper GB/T7475-1987 Atomic Absorption

Spectrophotometer 0.012 (wastewater) 0.002 (surface

water) Zinc GB/T7475-1987 Atomic Absorption Spectrophotometer 0.012 (wastewater)

0.005 (surface water) Lead GB/T7475-1987 Atomic Absorption

Spectrophotometer 0.05 (wastewater)

0.002 (surface water) Cadmium GB/T7475-1987 Atomic Absorption

Spectrophotometer 0.012 (wastewater) hexavalent

chrome GB/T7467—1987 722S Visible Spectrophotometer 0.004

Cyanide GB/T7487—1987 722S Visible Spectrophotometer 0.004

Volatile Phenol GB/T7490-1987 722S Visible Spectrophotometer 0.002

biochemical oxygen

demand in

Fourth edition of Monitoring and Analysis Methods of Water

and Wastewater — 0.1

Water environment

(mg/L, excluding

pH and water

temperature)

Fluoride GB/T7484-1987 DF801pH/Ionometer 0.05



69

Mercury Fourth edition of Monitoring

and Analysis Methods of Water and Wastewater

AFS-920 Atomic Fluorescence

Spectrophotometer 0.00001

Arsenic Fourth edition of Monitoring

and Analysis Methods of Water and Wastewater



suspended particulate

Third edition of Monitoring and Analysis Methods of Water

and Wastewater

AB204-N Electronic Balance 4

Total nitrogen GB/T11894-1989 Ultraviolet Spectrophotometer 0.05

Petroleum GB/T16488-1996 IR-200 Infrared Oil Analyzer 0.04

0.002 (surface water) Iron GB/T11911-1989 Atomic Absorption

Spectrophotometer 0.03 (wastewater)

Total hardness GB/T7477-1987 — 5 Water

temperature ()

GB/T13195-1991 thermometer 0.1

Total phosphorus GB/T11893-1989 722S Spectrophotometer 0.01

Sulphide GB/T17133-1997 722S Spectrophotometer 0.004

Table 5.2-2 Overview of Water Quality Monitoring and Analysis Methods (unit: mg/l, excluding pH)

5.2.5 Evaluation of existing baseline of water quality

5.2.5.1 Assessment Standards Class III standard of Environmental Quality Standard for Surface Water (GB3838-2002) for upstream of Meihua River (from Huangshakeng to the discharge outlet of Shaoguan Iron and Steel plant, 14km); Class IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) for the 6km segment of Meihua River from the discharge outlet of Shaouan Iron and Steel plant to downstream Longgang (mouth) and 4km segment from Longgang to Baitu (mouth); Class standard of Environmental Quality Standard for Surface Water (GB3838-2002) for upstream of Maba River (Huangmao to Longgang of Shaoguan, 42km); Class II standard for the Baitu segment of North River. Class III standard of Environmental Quality Standard for Surface Water (GB/T14848-93) is adopted for the evaluation of underground water.

5.2.5.2 Evaluation of existing baseline of water quality



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(1) For detailed result of water quality monitoring, see Table 5.2-3. The monitoring result is analyzed as follows: Monitoring result (mg/L pH excluded)

Sample Number and location pH suspended

particulate CODcr Arsenic Volatile Phenol

Petroleum Copper Lead Zinc Cadmium

1# 500m upstream of Meihua River from discharge outlet of Shaoguan

Iron and Steel plant 7.86 81 24 0.0012 0.002(L) 0.04(L) 0.014 0.016 0.028 0.002(L)

Times above the standard －－ 4 －－－－－－－

0.91kg before Meihua River joins Maba River 7.61 206 62.4 0.0028 0.002(L) 0.04(L) 0.132 1.2 1.25 0.043

Times above the standard － 1.06 1.08 －－－－ 23 － 7.6 1.36kg before Maba River joins

Meihua River 7.28 71 19.2 0.0028 0.002(L) 0.04(L) 0.021 0.048 0.075 0.002(L)

Times above the standard －－ 0.28 －－－－ 3.8 －－

1.81kg before Maba River joins North River 7.48 55.5 31.2 0.0042 0.002(L) 0.04(L) 0.062 0.98 0.79 0.02

Times above the standard －－ 0.04 －－－－ 18.6 － 3 6# upstream of Maba River after

joining Northe River, left 7.68 24.5 9.6 0.0055 0.002(L) 0.04(L) 0.011 0.032 0.049 0.002(L)

Times above the standard －－－－－－－－－－ right 7.64 34.5 12 0.0053 0.002(L) 0.04(L) 0.01 0.037 0.053 0.002(L)

Times above the standard －－－－－－－－－－ 7# downstream of Maba River after

joining Northe River, left 7.5 69 12 0.0045 0.002(L) 0.04(L) 0.031 0.123 0.145 0.01

Times above the standard －－－－－－－ 1.46 － 1 right 7.52 56.5 14.4 0.0025 0.002(L) 0.04(L) 0.044 0.028 0.052 0.002(L)

Times above the standard －－－－－－－－－－

Class II srandard 6~9 100 15 0.05 0.002 0.05 1 0.01 1 0.005 Class III_ standard 6~9 100 20 0.05 0.005 0.05 1 0.05 1 0.005



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Class IV_ standard 6~9 150 30 0.1 0.01 0.5 1 0.05 2 0.005

Table 5.2-3 Monitoring Results Statistics of Surface Water Table 5.2-3 (continued)

Monitoring result (mg/L, water temperature excluded)

Sample Number and location Sulphide Mercury Fluoride Cyanide Total

nitrogen Total

phosphorus Iron biochemical oxygen demand in

Water temperature

() 1# 500m upstream of Meihua River from discharge outlet of Shaoguan

Iron and Steel plant 0.004(L) 0.00001(L) 0.23 0.004(L) 0.81 0.19 0.43 2.99 24

Times above the standard －－－－－－ 0.43 －－ 3# before Meihua River joins Maba

River 0.004(L) 0.00001(L) 2.05 0.004(L) 2.42 0.21 3.37 7.03 24

Times above the standard －－ 0.37 － 0.61 － 10.23 0.17 － 4# before Maba River joins Meihua

River 0.004(L) 0.00001(L) 0.38 0.004(L) 2.17 0.24 0.52 3.67 24

Times above the standard －－－－ 3.34 1.4 0.73 0.22 － 5# before Maba River joins North

River 0.004(L) 0.00001(L) 0.96 0.004(L) 2.46 0.21 0.72 4.29 22

Times above the standard －－－－ 0.64 － 1.40 －－ 6# upstream of Maba River after

joining Northe River, left 0.004(L) 0.00001(L) 0.31 0.004(L) 1.05 0.2 0.34 0.97 23

Times above the standard －－－－ 0.05 － 0.13 －－ right 0.004(L) 0.00001(L) 0.31 0.004(L) 1.07 0.2 0.38 0.86 23

Times above the standard 0.07 0.27 7# downstream of Maba River after

joining Northe River, left 0.004(L) 0.00001(L) 0.74 0.004(L) 1.52 0.2 3.14 1.58 23

Times above the standard 0.52 9.47 right 0.004(L) 0.00001(L) 0.37 0.004(L) 1.72 0.2 0.58 1.86 23

Times above the standard －－－－ 0.15 － 0.93 －－



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Monitoring result (mg/L, water temperature excluded)

Sample Number and location Sulphide Mercury Fluoride Cyanide Total

nitrogen Total

phosphorus Iron biochemical oxygen demand in

Water temperature

() Class II srandard 0.1 0.00005 1 0.05 0.50 0.1 0.30 3 Class III standard 0.2 0.0001 1 0.2 1 0.2 0.3 4 Class IV standard 0.5 0.001 1.5 0.2 1.5 0.3 0.3 6



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1# Section: Complying with type III standard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class III standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: CODcr (4 times above standard), iron (0.43 time above standard); those meeting the standard are: PH, SS, arsenic, volatile phenol, petroleum, copper, lead, zinc, cadmium, sulfide, mercury, fluoride, cyanide, total nitrogen, total phosphorus, BOD5 and water temperature.

2# Section: Complying with type IVstandard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: SS (1.06 times above standard), CODcr (1.08 times above standard), lead (23 times above standard), cadmium (7.6 times above standard), fluoride (0.37 time above standard), total nitrogen (0.61 time above standard), iron (10.23 times above standard) and BOD5 (0.17 time above standard); those meeting the standard are: PH, arsenic, volatile phenol, petroleum-related substances, copper, zinc, sulfide, mercury, cyanide, total phosphorus and water temperature.

3# Section: Complying with typeIIstandard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class II standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: total nitrogen (3.34 times above standard), total phosphorus (1.14 time above standard), lead (3.8 times above standard), CODcr (0.28 times above standard), iron (0.73 time above standard), and BOD5 (0.22 time above standard); those meeting the standard are: SS, cadmium, fluoride, PH, arsenic, volatile phenol, petroleum-related substances, copper, zinc, sulfide, mercury, cyanide, and water temperature.

4#Section: Complying with type IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: CODcr (0.04 times above standard), iron (1.4 time above standard); those meeting the standard are: PH, SS, arsenic, volatile phenol, petroleum, copper, lead, zinc, cadmium, sulfide, mercury, fluoride, cyanide, total nitrogen, total phosphorus, BOD5 and water temperature.

5#Section: Complying with type III standard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class III standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: iron (0.13 time above standard); those meeting the standard are: SS, total nitrogen, CODcr, lead, cadmium, fluoride, PH, arsenic, volatile phenol, petroleum-related substances, copper, zinc, sulfide, mercury, cyanide, total phosphorus, BOD5 and water temperature .

5# Section: Complying with type IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: iron (0.27 time above standard); those meeting the standard Class III are: SS, total nitrogen, CODcr, lead, cadmium, fluoride, PH, arsenic, volatile phenol, petroleum-related substances, copper, zinc, sulfide, mercury, cyanide, total phosphorus, BOD5 and water temperature .

6# Section: Complying with type IVstandard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: lead (1.46 times above standard), cadmium (1 times above standard), total nitrogen (0.52 time above standard) and iron (9.47 times above standard); those meeting the Class IV standard are: SS, CODcr, fluoride, PH, arsenic, volatile phenol, petroleum-related substances, copper, zinc, sulfide, mercury, cyanide, total phosphorus, BOD5 and water temperature.

6# Section: Complying with type IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) The average value of monitoring results shows that monitored items on this section above the Class IV standard of Environmental Quality Standard for Surface Water (GB3838-2002) are: total nitrogen (0.15 time above standard) and iron (0.93 time above standard); those meeting the Class IV standard are: SS, CODcr, lead, cadmium, fluoride, PH, arsenic, volatile phenol, petroleum-related substances, copper, zinc, sulfide, mercury, cyanide, total phosphorus, BOD5 and water temperature.



74

To summarize, except iron and CODcr, all monitored items on the upstream section of Meihua river (1#) meet the requirements of Class III standard of GB3838-2002; the water quality on the section before Meihua River joins Maba River does not improve obviously with the increase of distance with the discharge outlet, and this is mainly because the incoming water from upstream is less than the amount of wastewater discharged along the river, and especially because the fact that, the discharge of wastewater from counties and enterprises along Qu River increases the amount of pollutant in the water body, making the degraded pollutant amount less than the increased one due to the limited dilution and degradation capacity of water body.

Based on the monitoring result of the section (3#) in front of the meeting of Meihua River and Maba River, CODcr, Pb, T-P, BOD5, T-N and Fe in water from the upstream of Maba River all exceed the standard. Several items in section (4#) in front of the meeting of Beijaing River and Maba River exceed the standard.

On the section before North River joins Maba River (5#), the monitored items of water quality all meet the requirements of Class IV standard of GB3838-2002 except iron; lightly polluted by iron; on the section after North River joins Maba River, all monitored items meet requirements of Class IV standard of GB3838-2002 except total nitrogen and iron.

(2) For detailed result of water quality monitoring, see Table 5.2-4. The monitoring result is analyzed as follows:

1# Dayuantou Village (He Fuyun)

This monitoring adopts Class III standard of Environmental Quality Standard for Underground Water (GB/T14848-93). The average value of monitoring results shows that all the monitored items of the point meet Class III standard of Environmental Quality Standard for Ground Water (GB/T14848-93); those meeting the standard are: PH, Cr6+, mercury, arsenic, cyanide, volatile phenol, iron, copper, lead, zinc and total hardness .

2# Yumachang No.31

This monitoring adopts Class III standard of Environmental Quality Standard for Underground Water (GB/T14848-93). The average value of monitoring results shows that all the monitored items of the point meet Class III standard of Environmental Quality Standard for Ground Water (GB/T14848-93); those meeting the Class III standard are: PH, Cr6+, mercury, arsenic, cyanide, volatile phenol, iron, copper, lead, zinc and total hardness .

3# Baoxishui 38#

This monitoring adopts Class III standard of Environmental Quality Standard for Underground Water (GB/T14848-93). The average value of monitoring results shows that all the monitored items of the point meet Class III standard of Environmental Quality Standard for Ground Water (GB/T14848-93); those meeting the Class III standard are: PH, Cr6+, mercury, arsenic, cyanide, volatile phenol, iron, copper, lead, zinc and total hardness .

4# Cheliao Village 35# (opposite to Pingtian Village)

This monitoring adopts Class III standard of Environmental Quality Standard for Underground Water (GB/T14848-93). The average value of monitoring results shows that all the monitored items of the point meet Class III standard of Environmental Quality Standard for Ground Water (GB/T14848-93); those meeting Class III standard are: PH, Cr6+, mercury, arsenic, cyanide, volatile phenol, iron, copper, lead, zinc and total hardness .

5# Chenziyuan Village 22# (opposite to Pingtian Village)

This monitoring adopts Class III standard of Environmental Quality Standard for Underground Water (GB/T14848-93). The average value of monitoring results shows that all the monitored items of the point meet Class III standard of Environmental Quality Standard for Ground Water (GB/T14848-93); those meeting Class III standard are: PH, Cr6+, mercury, arsenic, cyanide, volatile phenol, iron, copper, lead, zinc and total hardness .

To summarize, all measured results on the monitoring point meet Class III standard of Environmental Quality Standard for Underground Water (GB/T14848-93), indicating that the underground water in the evaluated area have fine water quality, and remain unpolluted.



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Table 5.2-3 Monitoring Results Statistics of Surface Water

Table 5.2-3 (continued)

Table 5.2-4 Monitoring Results Statistics of Surface Water Monitoring result (mg/L pH excluded) Sample Number and

location pH hexavalent chrome Mercury Arsenic Cyanide Volatile

Phenol Iron Copper Lead Zinc Total

hardness1# Dayuantou village 6.81 0.004(L) 0.00001(L) 0.0001(L) 0.004(L) 0.002(L) 0.2 0.009 0.021 0.036 192 2# Yumachang No.31 6.43 0.004(L) 0.00001(L) 0.0001(L) 0.004(L) 0.002(L) 0.06 0.013 0.011 0.038 113

3# Baoxishui 6.73 0.004(L) 0.00001(L) 0.0001(L) 0.004(L) 0.002(L) 0.27 0.008 0.02 0.061 221 4# Cheliao Village

(opposite to Pingtian Village)

6.9 0.004(L) 0.00001(L) 0.0001(L) 0.004(L) 0.002(L) 0.2 0.013 0.024 0.053 148

5# Chenziyuan Village 22# (opposite to Pingtian

Village) 6.74 0.004(L) 0.00001(L) 0.0001(L) 0.004(L) 0.002(L) 0.03(L) 0.012 0.024 0.072 132

Class III standard (GB/T14848-93) 0.05 0.001 0.05 0.05 0.002 0.3 1 0.05 1 450



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5.3 Monitoring and Evaluation of Existing baseline of Acoustic Environment Quality

5.3.1 Monitoring point According to the distribution of noise sources in this Project and the locations of surrounding sensitive points of acoustic environment, 12 monitoring points are established around the plant boundary on the land for the project of this phase, around SGIS plant boundary and at sensitive points. 5.3.2 Monitoring time and sampling frequency Monitoring of the monitoring points were conducted on February 25-27, 2008 and April 5-7, 2008, both lasting continuously for 2 days, including daytime monitoring and night monitoring, typically conducting measurement through sampling in short time, i.e., monitoring in work time during daytime (e.g., 8:00-12:00 and 14:00-18:00) and in sleep time during night (e.g., 23:00-05:00), measuring equivalent consecutive sound level A through integral sound level meter.

5.3.3 Monitoring method Monitoring method is adopted in accordance with relevant stipulations in Measuring Method of Environmental Noise of Urban Area (GB/T 14623-93). 5.3.4 Evaluation of existing baseline of acoustic environment quality

5.3.4.1 Standards for the execution of evaluation Upon request by the Ambient Noise Standard for Urban Area (GB3093-93), Yangwu Village, Dayuantou Village, Shanzibei School, Xiaogang Village and Xiaojiang Village, which are noise sensitive, are rural environments, the Class I Standard in the Ambient Noise Standard for Urban Area (GB3093-93) is implemented; as Old Xiaojiang Village is within the 300m radius of the boundary of SGIS, the Class II Standard in the Ambient Noise Standard for Urban Area (GB3093-93) is implemented; the factory is an industrial area, the Class III Standard in the Ambient Noise Standard for Urban Area (GB3093-93) is implemented. 5.3.4.2 Evaluation of existing baseline of acoustic environment quality Sensitive point Sensitive points monitored of the project include Yangwu Village, Dayuantou Village, Shanzibei School, Xiaogang Village, Xiaojiang Village and Laojiang Village. All monitoring points but Laojiang Village within 300m of the plant boundary comply with the Class II standard of Standard of Environmental Noise of Urban Area (GB3096-93). In the daytime, noise of all monitoring points in daytime can be up to Class III standard of Standard of Environmental Noise of Urban Area(GB3096-93). And at nighttime, the monitoring point in boundary of SGIS Plant also is up to the Class III standard. SGIS Plant boundary The plant boundary area belongs to industrial area, for which the Class III standard of Measuring Method of Environmental Noise of Urban Area (GB 3093-93) shall be executed. As learned from the monitoring result, during daytime, the noise level at all monitoring points meets the Class III standard of Measuring Method of Environmental Noise of Urban Area (GB 3093-93); during night, SGIS boundary reaches Class III standard. Boundary of gas tank area Boundary of gas tank area execute Class III standard of Ambient Noise Standard for Urban Area GB3093-93. The monitoring results show that noise level in daytime at all the monitoring points meets the standard. In conclusion, acoustic environment of gas tank area meets Class III standard because the area around it are no construction. But in consideration of the future development of SGIS, it is suggested that relevant noise control measures still need to be taken.

Table 5.3-1 Statistic Result of Noise Monitoring, unit: dB (A) Monitoring points Daytime Nighttime



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East side of Shaoguang Iron and Steel plant boundary 54.8~55.4 53.4~53.6

South side of Shaoguang Iron and Steel plant boundary 53.2~54.1 48.4~49.4

West side of Shaoguang Iron and Steel plant boundary 54.4~55.2 53~53.6

Northside of Shaoguang Iron and Steel plant boundary 57.6~58 53.7~54.1

Dayuantou village 51.3~52.9 47.3~49.1

Shanzibei school 52.2~53.9 49.7~58.4 Xiaojiang village 53.8~53.9 50.4~51.5

Old Xiaojiang Village 53~54 49.9~51.2

East of gas tank area boundary 52.8~53.8 50.4~51.9

West of gas tank area boundary 52.2~54.1 50.4~52.4

South of gas tank area boundary 55.0~55.8 53~53.6

North of gas tank area boundary 53.6~54.8 49.7~50.2

Class I Standard 55 45

Class II Standard 60 50

Class III Standard 65 55

5.4 Monitoring and Evaluation of Existing baseline of Soil Environment quality Existing baseline of soil environment quality is based on the existing baseline monitoring data from the EIA Report of five technical renovation projects of the iron-smelting plant of SGIS (March 2007).

5.4.1 Monitoring point

The soil monitoring points are mainly 5 as follows: 1# rice soil in New Xiaojiang Village, 2# vegetable garden soil in New Xiaojiang Village, 3# vegetable garden soil in Songshanxia Village, 4# rice soil in Old Xiaojiang Village and 5# paddy soil in upper reaches of Meihua River. For the distribution of soil monitoring points, see Figure 5.1-1.

5.4.2 Monitored items Soil survey factors: copper, lead, zinc, cadmium, mercury and arsenic, altogether 8 factors.

5.4.3 Monitoring Time and Sampling Frequency One soil monitoring was conducted on 18th May, 2006, with one samling. 5.4.4 Monitoring and analysis method The monitoring and analysis method is adopted in accordance with relevant chapters in Environmental Monitoring Analytical Method, Recent Analytical Methods of Soil Elements (edited by China Environmental Monitoring Center) of State Environmental Protection Administration. For all related analysis methods and their detection limits, see 5.4-1.

Items Basis for the monitoring method Monitoring instrument Minimum limit of identification

Copper GB/T17138-1997 Atomic Absorption Spectrophotometer 0.2



78

Zinc GB/T17138-1997 Atomic Absorption Spectrophotometer 0.5

Lead Recent Analytical Methods of Soil Elements Atomic Absorption Spectrophotometer 0.06

Cadmium Recent Analytical Methods of Soil Elements Atomic Absorption Spectrophotometer 0.006

Arsenic Recent Analytical Methods of Soil Elements AFS-920 Atomic

Fluorescence Spectrophotometer

0.011

Mercury Third edition of Monitoring and Analysis

Methods of Water and Wastewater Fourth edition



Table 5.4-1 Overview of Soil Analysis and Monitoring Methods

5.4.5 Evaluation of existing baseline of soil environment quality

5.4.5.1 Assessment Standards Based on the materials provided by monitoring station, the soil of Shaoguan region is acid soil, for which the acid soil standard in the Class II standard of Environmental Quality Standard for Soil GB15618-1995 shall be executed. For detailed information, see 5.4-2.

Table 5.4-2 Mean value of environmental quality standard for soil (unit: mg/kg, excluding pH)

Copper Lead Zinc Cadmium Mercury Arsenic Grade-2, soil ambient quality

standard 50 250 200 0.3 0.3 30

5.4.5.2 Evaluation of existing baseline of soil environment quality

1# paddy soil of new Xiaojiang village:

Class II standard of Environmental Quality Standard for Soil GB15618-1995 is executed on this section. The monitoring result of upper layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (6times above standard) and mercury (0.03times above standard); those meeting the standard are: copper, lead, arsenic and zinc; the monitoring result of lower layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (5.03times above standard); those meeting the standard are: copper, lead, mercury, arsenic and zinc.

2# vegetable garden soil of new Xiaojiang village

Class II standard of Environmental Quality Standard for Soil GB15618-1995 is executed on this section. The monitoring result of upper layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (7.07 times above standard); those meeting the standard are: copper, lead, arsenic, zinc and mercury; the monitoring result of lower layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (3.93 times above standard); those meeting the standard are: copper, lead, arsenic, mercury and zinc.

3# vegetable garden soil of Songshanxia village

Class II standard of Environmental Quality Standard for Soil GB15618-1995 is executed on this section.



79

The monitoring result of upper layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: copper (0.04 times above standard), cadmium (4.07 times above standard), and mercury (0.4 time above standard); those meeting the standard are: lead, arsenic and zinc; the monitoring result of lower layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (8.2 times above the standard), mercury (0.43 times above the standard); those meeting the standard are: copper, lead, zinc and arsenic.

4# paddy soil of old Xiaojiang village:

Class II standard of Environmental Quality Standard for Soil GB15618-1995 is executed on this section. The monitoring result of upper layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (5.73 times above standard) and mercury (0.03 times above standard); those meeting the standard are: copper, lead, arsenic and zinc; the monitoring result of lower layer of vegetable garden soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (4.5 times above standard); those meeting the standard are: copper, lead, mercury, arsenic and zinc.

5# paddy soil of upstream Meihua River

Class II standard of Environmental Quality Standard for Soil GB15618-1995 is executed on this section. The monitoring result of upper layer of paddy soil showsthe elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (5.07 times above standard); those meeting the standard are: copper, lead, arsenic, zinc and mercury; the monitoring result of lower layer of paddy soil shows, the elements of soil on this section above the Class II standard of Environmental Quality Standard for Soil GB15618-1995 are: cadmium (5.03 times above standard) and mercury (0.31 time above standard); those meeting the standard are: , copper, lead, arsenic and zinc..

Ca in all monitoring points exceeds the standard with the exceeding multiples of 4.5-7.7. Hg in upper-layer soil and subsoil of 1#, 3#, 4# and 5# monitoring points exceeds the standard. Cu in upper-layer soil of 3# monitoring points exceeds the standard.

Table 5.4-3 Monitoring Results Overview of Soil

Monitoring result (mg/Kg)

Sample No. and location Copper Lead Zinc Cadmiu

m Mercury Arsenic 1# upper layer of paddy soil of new

Xiaojiang village 14 86.4 40.8 2.1 0.23 25.5 Times above the standard 6.00

lower layer 12 72.3 31 1.81 0.31 28.5 Times above the standard 5.03 0.03

2# upper layer of vegetable garden soil of new Xiaojiang village 7 80.3 33.6 2.42 0.21 25 Times above the standard 7.07

lower layer 17 54.9 24.3 1.48 0.29 24.3 Times above the standard 3.93

3# upper layer of vegetable garden soil of Songshanxia village 104 50.9 28.4 1.52 0.42 22.3

Times above the standard 0.04 4.07 0.40 lower layer 27 70.5 28.2 2.76 0.43 22.3



80

Times above the standard 8.20 0.43 4# upper layer of paddy soil of old

Xiaojiang village 19 75.3 41.7 2.02 0.31 20.7 Times above the standard 5.73 0.03

lower layer 12 65.5 38.2 1.65 0.29 23 Times above the standard 4.50

5# upper layer of paddy soil of upstream Meihua River 10 62 29.7 1.82 0.3 13.8

Times above the standard 5.07 lower layer 29 62.5 33 1.81 0.36 17.7

Times above the standard 5.03 0.31 Grade-2, soil ambient quality standard 50 250 200 0.3 0.3 30



81

6 Environmental Impact Analysis

6.1 Prediction and assessment of ambient air impact

6.1.1 Analysis of pollution meteorological conditions This project collects meteorological information of 2002-2004 from Qujiang Meteorological Observatory for analysis of meteorological conditions of pollution.

6.1.1.1 Surface wind characteristics According to the 2002-2004 surface meteorological observation information statistics from Qujiang Meteorological Observatory, its annual prevailing wind is north wind, with a frequency of 12.6%, and static wind frequency is 25.9%, and the annual average wind speed is 1.64 m/s. Table 6-1 presents the wind direction frequencies and the average wind speed in an entire year and each season (this table shows the 2002-2004 data statistics with 24 times a day). Figure 6-1 shows the wind direction frequency rose diagram.

02468

101214

NNNE

NE

ENE

E

ESE

SE

SSES

SSW

SW

WSW

W

WNW

NW

NNW

Figure 6.1-1 Wind direction frequency rose diagram

Wind direction Season N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW C

Average wind speed

（m/s）

Frequency

11.50 5.16 3.89 0.32 0.77 0.54 2.45 1.77 17.62 9.10 5.66 0.82 2.17 2.90 7.25 5.57 22.46 Spring

Wind speed 3.10 2.45 1.71 0.91 1.26 0.77 1.25 1.36 3.02 3.16 2.07 0.59 1.04 1.16 1.42 1.99 0.00

1.83

Summer Frequenc

y 5.98 2.99 7.56 0.72 0.68 0.36 2.85 3.13 18.30 12.14 12.50 2.67 4.76 2.85 8.11 2.67 11.64 1.78



82

Wind speed 2.61 2.08 1.79 1.07 1.26 1.11 1.43 1.63 2.52 2.58 2.14 1.19 1.21 1.10 1.41 1.49 0.00

Frequency

14.56 8.01 10.26 2.38 0.69 1.47 5.04 2.79 4.44 3.39 3.48 1.05 2.20 1.88 5.40 3.71 29.08 Autumn

Wind speed 3.62 2.71 2.09 1.37 1.16 0.77 1.00 1.17 2.17 2.01 1.78 0.71 1.20 0.89 1.28 1.86 0.00

1.51

Frequency

18.43 10.32 3.56 1.39 0.60 1.02 2.31 1.20 2.55 2.27 1.25 0.42 1.39 2.18 4.12 6.39 40.51 Winter

Wind speed 3.56 2.72 2.05 1.09 0.78 1.15 0.93 1.12 2.49 2.63 1.22 0.81 0.94 0.98 1.42 2.16 0.00

1.45

Frequency 12.62 6.62 6.32 1.20 0.69 0.85 3.16 2.22 10.73 6.73 5.72 1.24 2.63 2.45 6.22 4.59 25.92 Whole year Wind

speed 3.36 2.59 1.94 1.21 1.13 0.92 1.13 1.37 2.69 2.71 2.02 0.96 1.14 1.05 1.39 1.95 0.00 1.64

Table 6.1-1 Wind direction frequencies and average wind speed in an entire

year and each season

Wind direction,

wind speed,

stability

N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW C

A 0.07 0.07 0.21 0.00 0.00 0.00 0.07 0.07 0.14 0.14 0.07 0.14 0.07 0.07 0.21 0.07 0.21 B 0.00 0.00 0.07 0.00 0.00 0.07 0.07 0.00 0.00 0.00 0.34 0.07 0.27 0.27 0.48 0.07 3.22 D 0.34 0.41 0.75 0.21 0.14 0.21 0.34 0.34 0.62 0.27 0.34 0.34 0.34 1.03 0.96 0.34 11.85 E 0.00 0.14 0.07 0.07 0.07 0.14 0.41 0.21 0.14 0.07 0.21 0.27 0.07 0.21 0.07 0.00 5.41

u≤1

F 0.07 0.27 0.27 0.27 0.27 0.34 0.55 0.48 0.34 0.14 0.14 0.14 0.00 0.27 0.07 0.27 7.88 A 0.34 0.14 0.21 0.14 0.07 0.00 0.00 0.07 0.07 0.14 0.21 0.14 0.48 0.27 0.82 0.27 0.00 B 0.34 0.14 0.21 0.00 0.00 0.00 0.14 0.00 0.21 0.07 0.41 0.07 0.34 0.14 0.27 0.27 0.00 C 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00 D 0.68 1.44 1.03 0.07 0.07 0.00 0.14 0.27 0.55 0.75 0.89 0.27 0.34 0.27 0.82 0.62 0.00 E 0.21 0.14 0.27 0.07 0.00 0.00 0.62 0.14 0.55 0.21 0.27 0.07 0.07 0.00 0.00 0.07 0.00

1<u≤2

F 0.21 0.07 0.55 0.21 0.07 0.14 1.30 0.68 0.62 0.34 0.07 0.00 0.21 0.00 0.14 0.00 0.00 A 0.14 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.00 0.07 0.00 0.00 0.00 0.00 B 0.21 0.00 0.68 0.07 0.07 0.00 0.00 0.07 0.07 0.07 0.27 0.00 0.14 0.00 0.21 0.14 0.00 C 0.14 0.00 0.21 0.00 0.00 0.00 0.00 0.00 0.34 0.14 0.48 0.00 0.00 0.00 0.07 0.14 0.00 D 1.44 1.16 1.30 0.00 0.00 0.00 0.00 0.21 1.51 0.55 0.62 0.00 0.07 0.07 0.75 0.48 0.00 E 0.21 0.07 0.21 0.00 0.07 0.00 0.00 0.07 0.82 0.48 0.27 0.00 0.00 0.00 0.00 0.00 0.00

2<u≤3

F 0.07 0.14 0.07 0.00 0.00 0.00 0.07 0.07 0.55 0.41 0.07 0.00 0.00 0.00 0.00 0.00 0.00 B 0.82 0.55 0.27 0.00 0.00 0.00 0.00 0.00 0.48 0.55 0.27 0.00 0.00 0.00 0.07 0.27 0.00 C 0.34 0.21 0.14 0.00 0.00 0.00 0.00 0.00 0.62 0.75 0.34 0.00 0.00 0.00 0.07 0.14 0.00 D 3.01 1.51 0.27 0.00 0.00 0.00 0.00 0.00 2.19 0.75 0.21 0.00 0.00 0.00 0.07 0.62 0.00 3<u≤5

E 0.34 0.27 0.07 0.00 0.00 0.00 0.00 0.00 0.27 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 C 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.27 0.00 0.07 0.00 0.00 0.00 0.07 0.00 0.00 u>5 D 1.51 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.14 0.14 0.00 0.00 0.00 0.00 0.00 0.07 0.00

Total 10.63 6.80 6.86 1.11 0.83 0.90 3.71 2.68 10.5 6.04 5.89 1.51 2.47 2.60 5.15 3.84 28.57



83

Table 6.1-2 Distribution table of combined frequencies for wind direction,

wind speed and atmospheric stability (%)

6.1.1.2 Atmospheric stability Table 6-2 presents the distribution results of atmospheric stability classified by P-T method, with neutrality accounting for 45.68%, as the main part. Analysis indicates that category A stability has a relatively low frequency of occurrence, category B and C stabilities occur in daytime, category D, E and F stabilities mostly occur at nighttime. Table 6-3 presents the distribution of combined frequencies for wind direction, wind speed and atmospheric stability (this table shows the 2002-2004 data statistics with 4 times a day due to a cloudiness of 4 times a day).

Table 6.1-3 Atmospheric stability frequencies (%) in different seasons of 2002-2004

Items A B C D E F

Spring 2.17 8.97 5.98 64.95 7.61 10.33

Summer 7.07 9.78 8.15 45.92 14.95 14.13

Autumn 7.14 21.98 2.75 26.10 15.66 26.37

Winter 5.56 10.56 1.94 45.56 15.56 20.83

Annual average 5.48 12.81 4.73 45.68 13.42 17.88

6.1.1.3 Variation of wind speed with height P

ZZUU ⎟⎟⎠

⎞⎜⎜⎝

⎛=

00

P

ZZUU ⎟⎟⎠

⎞⎜⎜⎝

⎛=

00

Variation of wind speed with height is expressed in index rate, namely:

Where U U0 refers to wind speed at the height of Z and Z0. P is a wind contour index, a parameter related to atmospheric stability Table 6-4 pressents the wind speed contour indexes at different stability based on the available information of the Plant.

Table 6.1-4 Fitting results of wind speed contour P value Stability B, C D E

P 0.25 0.35 0.48

6.1.1.4 Mixing layer height Mixing layer height refers to the scope to which air pollutants diffusing upward can reach. Due to dynamic interference and thermal effect of the ground, a relatively strong torrent is formed in the surface layer, which can transfer upward to a certain scope within which torrent strength is relatively large with a strong atmospheric diffusion capability; beyond which torrent strength is relatively weak with a weak diffusion capability. As to pollution diffusion within 50km, it is generally believed that the pollutants are limited to the scope of the mixing layer.



84

Based on the available information of the Plant, the average mixing layer heights at different stability are worked out and presented in Table 6.1-5.

Table 6.1-5 Average mixing layer height at different stability Stability B C D E, F

Average height 950 700 550 250

6.1.1.5 Atmospheric diffusion parameters Atmospheric diffusion parameter in the form of power function, namely:

σ Yba x= ⋅

σ Zdc x= ⋅

x: The distance of pollutants transferred with air flow in the air; a, b, c , d: coefficients and indexes reflecting the variation rules of diffusion parameters; σy,σz: represent a horizontal diffusion parameter and a vertical diffusion parameter respectively;

Based on the available information of the Plant, atmospheric diffusion parameters are worked out and showed in Table 6.1-6.

Table 6.1-6 Coefficients and indexes of atmospheric diffusion parameters in the form of power function.

Coefficient Stability

A b c c

B 0.389 0.883 0.271 0.865 C 0.329 0.878 0.231 0.852 D 0.276 0.875 0.197 0.840 E 0.157 0.891 0.121 0.835 F 0.103 0.905 0.092 0.810

In case of weak wind and calm wind conditions, diffusion parameters are selected and presented in the following table:

Table 6.1-7 Diffusion parameters of weak wind (0.5m/s≤u10<1.5m/s), calm wind (u10<0.5m/s)

(σx=σy=γ01T，σz=γ02T) γ01 γ02 Stability

u10<0.5m/s 0.5m/s≤u10<1.5m/s u10<0.5m/s 0.5m/s≤u10<1.5m/s A 0．93 0．76 0．57 0．57 B 0．76 0．56 0．47 0．47 C 0．55 0．35 0．21 0．21 D 0．47 0．27 0．12 0．12 E 0．44 0．24 0．07 0．07 F 0．44 0．24 0．05 0．05



85

6.1.2 Prediction model According to engineering analysis, in normal working conditions, blast furnace gas tank, industrial coke oven gas tank, civil coke oven gas tank and converter gas tank of this project discharge no waste gas. Gas leakage happens only in abnormal conditions and the gas is discharged via safe dispersing pipes. Hence, the abnormal point source puff diffusion models and parameters recommended by Technical Guidelines for Environmental Impact Assessment---Atmospheric Environment HJ/T2.2 are used for atmospheric environment impact prediction of this project.

6.1.2.1 Model The ground position of exhaust funnel as origin with the valid origin height of He and the average wind direction axis as X axis with source intensity of Q (mg/s). Set the time of starting abnormal discharge as t', duration of abnormal discharge as T and the time of estimating as t.

(1) Point source diffusion model when it is windy (U≥1.5m/s) According to the national environmental protection industry standard HJ/T 2.2~9.3 Technical Guidelines for Environmental Impact Assessment---Atmospheric Environment and Environmental Impact Assessment by Administration Department of Ministry of Environmental Protection of the People’s Republic of China: When it is windy, set the ground position of exhaust funnel as the origin with valid height of He , average

wind direction axis as X axis with source intensity of )/( smgQ , and the abnormal discharge time as T. With the continuous discharge model as a basis, multiply the concentration of any point (x, y, z) at the time of t by a parameter G1:

12

2

2exp

2),,( GFy

uQzyxc

yzy

••⎥⎥⎦

⎤

⎢⎢⎣

⎡⎟⎟⎠

⎞⎜⎜⎝

⎛−=

σσσπ

∑=

+−+−−=k

knzHenhyHenhF )]2/)2(exp[)]2/)2exp[ 2222 σσ

⎪⎩

⎪⎨⎧

=≤−⎟⎟

⎠

⎞⎜⎜⎝

⎛Φ+⎟⎟

⎠

⎞⎜⎜⎝

⎛ −Φ

>⎟⎟⎠

⎞⎜⎜⎝

⎛ −−Φ−⎟⎟

⎠

⎞⎜⎜⎝

⎛ −Φ

TtxxUt

TtxUTUtxUtxx

xx

G,1

,1

σσ

σσ

In the equation, F----Mixed layer reflection item; G1----Abnormal discharge item; h----Height of mixed layer;

k----Reflection times, k=4 is sufficient for Class 1 and Class 2 projects. Values of indexes and coefficients of diffusion parameters are worked out in accordance with HJ/T 2.2~9.3.

Concentration of any point ),( YX at the time of T is calculated in accordance with the formula below:

12

2

2

2

22exp GHey

uQc

zyzya •

⎥⎥⎦

⎤

⎢⎢⎣

⎡⎟⎟⎠

⎞⎜⎜⎝

⎛−−=

σσσσπ

Parameters are consistent with that described above.

(2) Point source diffusion model in case of static wind and breeze

In case of breeze (1.5m/s＞U10≥0.5m/s) and static wind (U10＜0.5m/s＝), concentration of any point (x,y,0) at the time of t is:



86

202

201

2/33

)2()0,,( G

QAyxCa ⋅=

γγπ Where

⎪⎪⎪⎪

⎩

⎪⎪⎪⎪

⎨

⎧

>−Φ−−−

Φ

+−−

−−−−

≤⎟⎠⎞

⎜⎝⎛ −Φ−+−−

=

TtAt

AATt

AA

A

ATt

AAt

AA

TtAt

AAA

At

AA

G

)],1(2[)]1(2[2

])1(exp[])1(exp[1

],12[12])1(exp[1

21211

2

221

221

1

2121

221

1

2

π

π

])(/[])()([21exp

])(/[)(

])([2

1

2

02

0122202

222

201

2

3

2

02

01222

2

02

0122201

1

γγ

γγ

γγ

γγ

γ

HeYXHeuvvXuYA

HeYXYXA

HeYXA

vu

+++

+−

−=

+++=

++=

In the equation, u, v----wind speeds in directions of x and y respectively; γ01, γ02----regression coefficients of diffusion parameters in case of breeze and static wind. They are taken in accordance with Appendix B of Guidance.

(3) Multi-source superposition model If more than one point source are required for assessment, superpose the contribution of each source on acceptance point concentration during the concentration calculation. Selecting an origin in the assessment area, taking upwind direction of the average wind as the positive x axis, the total concentration contribution Cn of each source (with coordinates of xr,yr,0) to any ground point (x, y) can be calculated by the formula as below:

( ) ( )...,0,, rrrn yyxxCyxC −−= ∑ where Cr is the concentration contribution of rth point source on the point of (x,y,0), and relevant point source model given in this chapter can be used in the calculation formula in accordance with different conditions, but coordinate conversion should be noted, replacing (x-xr,y-yr) with

(x,y,0). ( )[ ] 2/1// dzgduhH Tc θθ−= ( )[ ] 2/1// dzgduhH Tc θθ−=

6.1.2.2 Source intensity of pollutant in abnormal working conditions Referring to SIGI statistic sources, each dispersing time is 30 min, averagely 6 times annually. According to survey of gas tanks that have already been put into operation, discharge sources at all abnormal working conditions are listed as Table 6.1-8.

Table 6.1-8 Abnormal discharge source intensity of this project

CO g/s Amount of gas

emission m3/time

Duration min Discharging height Discharging temperature

Blast furnace 305.03 1670 30 121 55



87

gas tank Industrial coke oven gas tank 27.98 584 30 83 55

Civil coke oven gas tank 4.03 84 30 65 55

Gas tank of converter No.1 586.41 1250 30 50 72

Gas tank of converter No.1 586.41 1250 30 50 72

*Note: under abnormal conditions the gas tanks release the excessive gas via the safety release pipes, the height of which is as high as or a bit higher than the that of the relevant gas tank. In order to estimate the impact of gas tanks on ambient atmospheric environment in abnormal working conditions, two cases are considered for estimation this time: (1) Simulate the worst case that may occur in abnormal working conditions of gas tanks and estimate the impact of leaked CO on the ambient atmospheric environment when all gas tanks discharge simultaneously. (2) Simulate the worst case that may occur in abnormal working conditions of single gas tank, and estimate the impact of leakage from converter gas tank with maximum leakage of CO.

6.1.3 Monitoring results (1) All gas tanks leak simultaneously. For estimation of downwind CO concentration along ground axis in the discharged gas when all gas tanks discharge gas simultaneously, please refer to Table 6.1-9. In order to simulate the impact on ambient atmospheric environment in this working condition, added values of sensitive points are taken as the maximum values in various meteorological conditions as shown in Table 6.1-10. At the same time, in view of the impact of the discharged CO on human health and relevant health indexes, please refer to Table 6.1-11 for the estimation results.



88

Table 6.1-9 Estimation results (mg/m3) for added value of downwind CO concentration along ground axis when all gas tanks discharge simultaneously

B D E Y\X 0.5m/s 1.5 m/s 2.5 m/s 0.5 m/s 1.5 m/s 2.5 m/s 0.5 m/s 1.5 m/s 2.5 m/s

0 23.6831 0 0 13.3926 0 0 1.4803 0 050 20.8581 0 0 21.5637 0 0 2.4885 0 0

100 15.9597 0.0202 0.0491 27.4303 0 0 3.9478 0 0200 8.9543 3.0799 3.1985 28.3829 0.0004 0.0016 7.711 0 0300 5.37 10.0595 8.0484 23.3182 0.0802 0.1455 10.9341 0 0400 3.4895 13.9061 9.9841 18.2347 0.8061 0.9995 12.495 0 0500 2.4227 14.7546 10.0098 14.2618 2.6015 2.6217 12.6364 0 0.0001600 1.7708 14.0928 9.2512 11.2989 4.9752 4.4178 11.9847 0.0006 0.0014700 1.3469 12.8297 8.2487 9.0934 7.2399 5.9144 11.0045 0.0058 0.0106800 1.0572 11.43 7.2434 7.4338 9.0232 6.9555 9.9481 0.0282 0.0427900 0.851 10.0876 6.3256 6.1667 10.247 7.5737 8.9321 0.0885 0.1161

1000 0.6994 8.8938 5.533 5.184 10.9998 7.8787 8.0023 0.2072 0.2431100 0.5847 7.8632 4.8623 4.4103 11.382 7.9585 7.1716 0.3954 0.4251200 0.4959 6.9692 4.2891 3.7924 11.492 7.8849 6.4381 0.6524 0.65352000 0.1855 3.063 1.8542 1.4903 9.0546 5.7885 3.0167 3.3881 2.58752500 0.12 2.0595 1.2415 0.9742 7.3575 4.6271 2.0598 4.0405 2.92723000 0.0839 1.4866 0.8867 0.6851 6.0328 3.7538 1.4855 4.2969 3.00813100 0.0787 1.4043 0.8341 0.6429 5.808 3.6076 1.3991 4.3162 3.00523200 0.0739 1.3303 0.786 0.6044 5.5951 3.4695 1.3198 4.3275 2.99783300 0.0696 1.2638 0.7419 0.5693 5.3935 3.339 1.2469 4.3317 2.98644000 0.0476 0.9501 0.5161 0.3909 4.2484 2.6003 0.8698 4.2227 2.83575000 0.0306 0.7426 0.3411 0.252 3.1906 1.9096 0.5679 3.8701 2.53666000 0.0213 0.6305 0.2525 0.1758 2.5387 1.4667 0.399 3.474 2.24117000 0.0157 0.5523 0.2061 0.1296 2.1174 1.1663 0.2953 3.1047 1.9804



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8000 0.012 0.4926 0.179 0.0994 1.8303 0.9535 0.2272 2.7799 1.7581Maximum dropping to ground

Density 23.6831 14.7546 10.0098 28.3829 11.4492 7.9586 12.6364 4.3317 3.0081

Distance to the source Distance (m) Outlet 500 500 200 1200 1100 500 4000 3000

Standard Level 2 assessment standard (1-hour average) 10mg/m3

Table 6.1-10 Impact of CO in gas on environment sensitive points when all gas tanks discharge at the same time

Sensitive point Prediction increment

Monitoring value of the existing baseline

Compliance of the existing baseline

Superposition value of the existing baseline

Percentage of increment to Class II standard value %

Percentage to Class II standard value after superposition %

1 Old Xiaojiang Village 11.3820 1.68 Qualified 13.062 113.82 130.62 2 New Xiaojiang Village 9.4329 2.05 Qualified 11.4829 94.33 114.83 3 Daping Village 11.3026 2.18 Qualified 13.4826 113.03 134.83 4 Liantang Village 14.0928 3.67 Qualified 17.7628 140.93 177.63 5 Yumin Village 5.7885 1.77 Qualified 7.5585 57.89 75.59 6 Shuibei Village 5.4763 1.10 Qualified 6.5763 54.76 65.76

7 Maba No. 3 Primary School 6.0328 1.06 Qualified 7.0928 60.33 70.93

8 Da Yuantou 5.8080 1.10 Qualified 6.908 58.08 69.08

9 Shaogang No. 1 Middle School 6.2702 1.0 Qualified 7.2702 62.70 72.70

10 Meihuazhai Village 4.4771 2.0 Qualified 6.4771 44.77 64.77 11 XinZhai 2.3936 1.0 Qualified 3.3936 23.94 33.94 12 Maba Town 1.8547 2.25 Qualified 4.1047 18.55 41.05 13 Nanhua Temple 0.5272 1.13 Qualified 1.6572 5.27 16.57 14 Shanzibei 18.2437 3.23 Qualified 21.4737 182.44 214.74

* Note: In order to estimate the worst impact of CO on the ambient environment sensitive points when all gas tanks discharge at the same time, all added impact values of are taken as the maximum estimation values in all meteorological conditions,



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Table 6.1-11 Standard scope of CO in condition that all gas tanks discharge gas simultaneously B D E

Y\X 0.5m/s 1.5 m/s 2.5 m/s 0.5 m/s 1.5 m/s 2.5 m/s 0.5 m/s 1.5 m/s 2.5 m/s Eligibility range and the wind distance of

the corresponding concentration (m) Corresponding diffusion concentration

200 1000 600 700 1800 / / / /

8.9543 8.8938 9.2512 9.0934 9.8203 / / / / Assessment Standards Level 2 assessment standard (1-hour average) 10mg/m3

Health impairment range and corresponding concentration / / / / / / / / /

/ / / / / / / / / The limit for harmful factor contact in the workplace is 30mg/ m3.

Acute toxicity: As can be seen in Table 6.1-11, the lower maximum concentration is 43.8148 mg/m3, which is far smaller than

the acute toxicity concentration. Therefore, no acute intoxication will occur in times of diffusion.

Assessment standards for acute toxicity LC50618mg/m3 (inhalation by rat).



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If all the tanks disperse synchronously, CO concentration in surroundings in the project will increase faster, and in every sensitive point the influence of average CO ground concentration increases obviously, accounting for 182.44~5.27% of the Class Ⅱ standard value of ambient air quality. The superimposed

value of the existing baseline accounts for 214.74~6.57% of the Class Ⅱ standard value of ambient air quality. All CO concentration values in Old Xiaojiang Village, Taiping Village, Liantang Village and Shanzibei exceed the Class Ⅱ standard value of 10mg/m3 (average value of an hour) specified in Ambient Air Quality Standard (GB3095-1996). The farthest estimated scope with over-standard values in various meteorological conditions is located within the range of about 3200m downward of the gas tanks in case of D 1.5m/s. All the sensitive points are over the CO concentration 3.00mg/m3 (One-time value) regulated in Maximum Allowable Concentration of Hazardous Substances in the Atmosphere of Residential Area (TJ36-79), not above the value in Occupational Exposure Limit of Workshop Harmful Factors (GBZ2-2002), but much lower than the acute toxicity standard, and won’t lead to casualties. Hence, if all gas tanks discharge simultaneously in abnormal working conditions, it will make not only obvious impact on the sensitive points but also significantly adverse impact on the ambient environment.

(2) Only single converter gas tank leakage. For estimation of downwind CO concentration along ground axis in the discharged gas when all gas tanks discharge gas simultaneously, please refer to Table 6.1-13. In order to simulate the impact on sensitive points of ambient environment in this condition, all the added values of sensitive points are taken as the maximum values in various meteorological conditions as shown in Table 6.1-12.

Table 6.1-12 Estimation results (mg/m3) for added values of downwind CO concentration along ground axis when only one gas tank discharges

B D E Y/X 0.5 1.5 2.5 0.5 1.5 2.5 0.5 1.5 2.5

0 5.9089 0 0 1.6439 0 0 0.2946 0 0 100 7.2199 0 0 4.2538 0 0 0.7381 0 0 200 4.404 0.0005 0.0305 6.8825 0 0 1.6268 0 0 300 2.5596 0.1897 0.9612 7.4632 0 0.0001 2.8004 0 0 400 1.6053 1.2441 2.5409 6.6642 0.0002 0.0138 3.802 0 0 500 1.0839 2.5621 3.4093 5.5279 0.0089 0.1319 4.3526 0 0 600 0.7757 3.5723 3.657 4.49 0.0698 0.4446 4.4748 0 0 700 0.5805 3.9398 3.4614 3.6485 0.2424 0.9013 4.3155 0 0.0001 800 0.4499 3.8977 3.1092 2.9905 0.5373 1.3856 4.0117 0.0003 0.001 900 0.3585 3.6555 2.7333 2.4792 0.9118 1.8106 3.654 0.0017 0.0049

1000 0.2921 3.3381 2.3854 2.0799 1.3075 2.1388 3.293 0.0068 0.0156 1200 0.2045 2.7223 1.8367 1.5133 2.0129 2.5281 2.6459 0.0442 0.073 1300 0.1747 2.4471 1.6202 1.3101 2.2775 2.6069 2.3722 0.0844 0.1238 1400 0.1509 2.2013 1.4361 1.1441 2.4793 2.6316 2.1312 0.1417 0.1886 1500 0.1317 1.9841 1.2794 1.007 2.6238 2.6167 1.9199 0.2155 0.2644 1700 0.1028 1.6258 1.0304 0.7962 2.7728 2.5116 1.5731 0.4028 0.4355 2000 0.0745 1.2353 0.7702 0.5841 2.7633 2.2687 1.1957 0.731 0.6931 3000 0.0332 0.5985 0.3614 0.2655 2.1293 1.5134 0.5729 1.2386 0.9909 4000 0.0187 0.3802 0.2084 0.1505 1.5804 1.0519 0.331 1.3843 1.0215 4100 0.0178 0.3682 0.1987 0.1433 1.5368 1.0175 0.3156 1.3869 1.0176 4200 0.017 0.3573 0.1898 0.1366 1.4951 0.9848 0.3012 1.388 1.0128 4300 0.0162 0.3473 0.1814 0.1304 1.4553 0.9536 0.2878 1.3878 1.0074 5000 0.012 0.2957 0.1368 0.0967 1.2213 0.772 0.2145 1.3581 0.9565

Maximum dropping to ground 7.2199 3.9398 3.6570 7.4632 2.7728 2.9316 4.4748 1.3878 1.0215



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Density Distance to the source

Distance (m) 50 700 600 300 1700 1400 600 4300 4000

Standard Class Ⅱ assessment standard (1-hour average) 10mg/m3



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Table 6.1-13 The impact imposed by CO in the dispersed gas of a single converter gas tank on environment sensitive points

Sensitive point Prediction

increment Monitoring value of the existing baseline

Compliance of the existing baseline

Superposition value of the existing baseline

Added value: 20%; standard value %

Percentage to Class II standard value after superposition %

1 Old Xiaojiang Village 3.0234 1.68 Qualified 4.70 30.23 47.03 2 New Xiaojiang Village 2.7885 2.05 Qualified 4.84 27.89 48.39 3 Daping Village 2.1836 2.18 Qualified 4.36 21.84 43.64 4 Liantang Village 4.4748 3.67 Qualified 8.14 44.75 81.45 5 Yumin Village 2.2687 1.77 Qualified 4.04 22.69 40.39 6 Shuibei Village 1.997 1.10 Qualified 3.10 19.97 30.97 7 Maba No. 3 Primary

School 2.1293 1.06 Qualified 3.19 21.29 31.89

8 Da Yuantou 2.0652 1.10 Qualified 3.17 20.65 31.65 9 Shaogang No. 1

Middle School 2.1950 1.0 Qualified 3.20 21.95 31.95

10 Meihuazhai Village 1.6914 2.0 Qualified 3.69 16.91 36.91 11 XinZhai 1.2379 1.0 Qualified 2.24 12.38 22.38 12 Maba Town 1.0679 2.25 Qualified 3.32 10.68 33.18 13 Nanhua Temple 0.2173 1.13 Qualified 1.35 2.17 13.47 14 Shanzibei 6.6642 3.23 Qualified 9.89 66.64 98.94

* Note: In order to estimate the worst impact of CO on the ambient environment sensitive points when all gas tanks discharge at the same time, all added impact values of are taken as the maximum estimation values in all meteorological conditions,



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Table 6.1-14 Healthy concentration range of the diffusion of CO in the dispersed gas of a single converter gas tank

B D E Y\X 0.5m/s 1.5 m/s 2.5 m/s 0.5 m/s 1.5 m/s 2.5 m/s 0.5 m/s 1.5 m/s 2.5 m/s

/ / / / / / / / / Eligibility range and the wind distance of the corresponding concentration (m)

Corresponding diffusion

concentration

/ / / / / / / / /

Assessment Standards Level 2 assessment standard (1-hour average) 10mg/m3

/ / / / / / / / / Health impairment range and

corresponding concentration

/ / / / / / / / /

The limit for harmful factor contact in the workplace is 30mg/ m3.

Acute toxicity: As can be seen in Table 6.1-11, the lower maximum concentration is 43.8148 mg/m3, which is far smaller than

the acute toxicity concentration. Therefore, no acute intoxication will occur in times of diffusion.

Assessment standards for acute

toxicity LC50618mg/m3 (inhalation by rat).

According to Table 6.1-12, if a converter gas tank discharges in abnormal working conditions, CO concentration in ambient environment of this project will increase to some extent, impact value of average ground concentration of CO on each sensitive point increase obviously, the concentration values account for 66.64%~2.17% of Class Ⅱ standard of ambient air quality, and 98.94~13.7% of Class Ⅱ standard of

ambient air quality after added with the existing baseline values. None of the values exceeds the Class Ⅱ standard value of 10mg/m3 (average value in an hour) of CO specified in Ambient Air Quality Standard (GB3095-1996).

Hence, all CO concentration values of the sensitive points are consistent with the Class Ⅱ standard value of 10mg/m3 regulated by Ambient Air Quality Standard (GB3095-1996). In all kinds of weather conditions, the max. concentration forecasted at 50m is at B. 0.5m/s, within the scope of 50m in the back-wind direction of tank area. According to Table 6.1-11, if one converter gas tank discharges, only CO concentration values in Laoxiaojiang and Shanzibei exceed the value 3.00mg/m3 (the value measured each time) regulated in Maximum Allowable Concentration of Hazardous Substances in Atmosphere of Residential Areas (TJ36-79), but none of the values is higher than the limit values regulated by Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002) and the values are far lower than the acute toxicity standard value. Thus, the CO discharged in this condition makes little impact on health of the residents and the concentration values are admissible. Hence, if a converter gas tank discharges in abnormal working conditions, it will make certain impact on the sensitive points, but the CO concentration value will not exceed the Class Ⅱ standard value 10mg/m3 (average value of an hour) regulated by Ambient Air Quality Standard (GB3095-1996) and will not make obvious adverse impact on the ambient environment.

6.1.4 Suggestions Arrange the discharge time of all gas tanks reasonably, so as to avoid simultaneous discharge of all gas tanks;



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6.1.5 Health protection zone (1) The calculation formula for health protection zone According to requirement of the Technical methods for making local emission standards of air pollutants (GB/T13201-91), all those harmful gas emissions not through exhaust stacks or through exhaust stacks with height below 15m are fugitive emissions. When the harmful gas of fugitive emission enters into the breathing zone in atmosphere, if its concentration exceeds allowable concentration limit value for residential area provided by requirements of GB3095 and TJ36, the production zone between the production units (production areas, workshops or sections) where the fugitive emission sources lie and the residential areas shall be established. CO concentration of this project is calculated with CO as a fugitive emission factor and the maximum admissible value of CO concentration is equal to 1.0mg/m3 in accordance with TJ36-79CO. According to engineering analysis, fugitive emission of CO at the gas tank area is X kg/h (please refer to Table 3.3-3). The calculation formulas for health protection zone are:

( ) Dc LrBLACm

Qc⋅+= 2

1225.01

Where Cm — Standard concentration primary limit value (mg/m3); L — Protective distance for industrial enterprises (m); Qc — Achievable control level of fugitive emission of harmful gas (kg/h); R - The equivalent radius of production unit where the fugitive emission source of harmful gases lies (m), calculated according to the area S (m2) occupied by production unit; A, B, C, D - calculating coefficients of the health protection zone, dimensionless, may be looked up in GB/T13201-91 Table 5, according to the average wind speed of recent five years in the region where industrial enterprises lie and atmospheric pollution category of industrial enterprises. Table 6.1-15 calculating coefficients of the health protection zone (GB/T13201-91).

Table 6.1-15 Coefficient for calculation of hygienic protection distance (GB/T13201-91)

Health protection distance(m) L≤1000 1000<L≤2000 L>2000

Atmospheric pollution category of industrial enterprises

Calculation parameters

Industrial enterprises recent five years the

region located Average wind

speed II III II III II III

A <2

2~4 >2

400 700 530

400 470 350

400 350 260

400 700 530

400 470 350

400 350 260

80 380 290

80 250 190

80 190 140

B <2 >2

0.01 0.021

0.015 0.036

0.015 0.036

C <2 >2

1.85 1.85

1.79 1.77

1.79 1.77

D <2 >2

0.78 0.84

0.78 0.84

0.57 0.76

(2) Calculation results



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According GB/T13201-91, when a number of harmful gases are emitted fugitively by an industrial enterprise simultaneously, its health protection distance required shall be calculated according to the max value in Qc/Cm. According to source intensity in engineering analysis, coefficient for calculation of hygienic protection distance in this EIA Document is taken as 1.0kg/h based on fugitive emission of CO. see Table 6.1-16.

Table 6.1-16 Table 2.2-10 the health protection distance calculation status of this project

CO H2S

Discharging Amount kg/h 4.425 0.1699

Fugitive emission area(m2) 16200 16200

Concentration limit value(mg/m3) 1.0 0.06 Calculated value of the health protection

distance 141.41 81.55

Values taken from calculation of the health protection distance 200 100

According to GB/T13201-91, the hygienic protection distance can be taken as 200m. There is no sensitive point within a 200m radius of this project. Thus, this requirement is satisfied.

6.2 River Environment Impact Analysis

6.2.1 Overview of pollutant carrying river where the project is located Industrial wastewater from SGIS converges and flows into the main drain ditch which leads to Meihua River. After convergence with the upstream river water, it finally flows to Beijiang trunk at Baitu via Meihua River and Maba River. The sewage outlet of the project is located at middle and lower reaches of Meihua River, which flows to Baitu River section of middle reaches of Beijiang in Qujiang county after convergence with Maba River 6km away west. The average flow rate of Meihua River is about 3m3/s. Beijiang is the second largest water system of Pearl River basin, with a total length of 468 km and the average slope of 0.26%. Beijiang river basin (Sixianjiao) has an multi-year average flow rate of 1620 m3/s, average flow rate in high water period 2520 m3/s, and in low water period 714 m3/s. The project is near Baitu river reach (with a rainwater catchment area of 16750 square kilometers), and the average flow rate of the river is 467 m3/s over years. According to engineering analysis, in normal working conditions, industrial wastewater of the gas tank area mainly consists of oily wastewater generated during operation of blast furnace gas tanks, phenolic wastewater and naphthalin wastewater generated by coke oven gas tanks, dusty wastewater generated during operation of converter gas tanks, domestic wastewater of the staff and initial rain water, etc.

6.2.2 Feasibility analysis on “zero emission” of wastewater from gas tanks Make-up flow of fresh water in this project is 632023.3m3/a, generated wastewater volume 629177.7 m3/a, industrial wastewater volume 620911.3 m3/a, domestic wastewater 6816.375 m3/a and initial rain water volume 1450 m3/a. All wastewater is recycled without drainage after being treated. Total water consumption volume of the circulating system is 2978400 m3/a (340m3/h) with circulating rate of 98.5%. All the industrial wastewater, domestic wastewater and initial rain water of the project is recycled after being treated. The details are illustrated as follows:

(1) Production Wastewater The volume of industrial wastewater generated is 620911.3m3/a, where clean sewage accounts for 52164m3/a, dusty wastewater 525600 m3/a, oily wastewater 3789.5 m3/a, phenolic wastewater 38877.8m3/a



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Naphthalin wastewater480 m3/a。 Generating and recycling of wastewater in all systems are as follows:

1) Oily wastewater Oily wastewater mainly consists of drainage of condensing water from bottom plate of gas tank, flushing water of oil gallery at the bottom of gas tank, oily wastewater separated from oil pump station, oily wastewater of water layer at the bottom of gas tank and oily wastewater from flushing wastewater of gas tank area. At the same time, some oily water is discharged together with the water seal water from pipelines DN2600 and DN1400. The total volume of oily wastewater reaches 3789.5 m3/a. All the oily wastewater is discharged into wastewater treatment plant of coking plant and is used as the make-up water of flushing water for blast furnace after being treated.

2) Phenolic wastewater Phenolic wastewater mainly comes from industrial and gas tanks, including drainage of condensing water for bottom plate of gas tank, flushing water of oil gallery at the bottom of gas tank, drainage of separated water from oil pump station, phenolic wastewater separated from oil pump station and phenolic wastewater from flushing wastewater of gas tank area. At the same time, some phenolic wastewater will be discharged together with the water seal water from pipelines. Water sealing shall be arranged along the pipeline in the tank areas of the project and it is sure to produce phenol containing wastewater. Meanwhile, 20 sets of gas drainers shall be arranged in the whole tank area. When the moisture is saturated in the gas, condensate water will be produced and drained through the drainers. Both are phenolic wastewater.

3) Naphthalin wastewater Naphthalin wastewater of this project mainly comes from gas purification stations of industrial and civil coke ovens. The total volume of naphthalin wastewater comes to 480 m3/a, and all the naphthalin wastewater is discharged into wastewater treatment plant of coking plant for treating. The total volume of phenolic wastewater generated in the project area reaches 38877.8m3/a and that of naphthalin wastewater 480 m3/a. Both are discharged into wastewater treatment plant of coking plant for treating and will be used as make-up water of flushing water for blast furnace after being treated.

4) Clean sewage The clean sewage water of the project comes mainly from the spray cooling tower of the blast furnace gas tank, coke oven gas pressure booster stations, mixed gas booster stations, as well as ash-containing wastewater of converter gas tank body (as per data extrapolation, it can be discharged directly into the clean sewage system due to extremely small ash content), and enters the clean sewage water system of the plant for reuse.

5) Dusty wastewater Dusty wastewater mainly comes from electrostatic precipitators of converter gas tanks and its total volume reaches 525600 m3/a. This dusty wastewater is discharged into wastewater treatment plant of No. 3 Steel Plant for treating and then will enter turbid circulating water system for recycling.

(2) Initial Rainwater It is estimated that the initial rain water drainage is about 1450m3 after the project is put into operation. Its pollutants are mainlypetroleum, CODCr and SS. It is suggested to discharge the initial rain water into the wastewater treatment plant of coking plant for treating and apply it as make-up water of flushing water for the



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blast furnace after treating.

(3) Domestic wastewater The wastewater produced by the 83 employees in the project is 6816.375 m3/a, which will be discharged into the coking wastewater treatment plant and be used as the supplement of the blast furnace slag flushing water when treated to meet the standard. In summary, it is feasible to realize “zero drainage” in the gas tank area.

6.2.3 River Environment Impact Analysis Water conservation is considered in design of this project and relevant measures have been taken, e.g. recycling based on quality, discharging the circulating water into clean sewage system for recycling, treating all the phenolic wastewater, oily wastewater and dusty wastewater for recycling. Electrostatic precipitators of converter require continuous water supply of 60m3/h during the process. All the drainage can be collected temporarily by the water gather tank in gas tank area for treating instead of being discharging into the Meihua River. “Zero discharge” of industrial wastewater is realized for this project. Major domestic wastewater can be recycled after being treated instead of being discharged. Hence, this project will not impact the environment water environment. In addition, SGIS is preparing to construct a wastewater treatment plant and the environmental impact assessment is in progress. After completion of the wastewater treatment plant, all the wastewater from the plant will be discharged after being treated in the wastewater treatment plant. Then, the pollution problem caused by direct drainage of domestic wastewater will be solved and the water quality of the Meihua River, the Maba River and the Beijiang River at the lower reach of discharge outlet will be improved obviously. Therefore, the wastewater generated by gas tanks has little impact on the ambient environment.

6.3 Water environment impact assessment Acoustic environmental impact assessment refers to assessing the acoustic environmental impact brought about in the process of the construction and production of the project, acquiring the degree and range of the acoustic environmental impact on the surrounding environment of projects by means of field investigation and model calculation, and proposing protective measures according to relevant noise standards issued by the state in order to limit the acoustic environmental impact within the specified standard range.

6.3.1 Noise Sources The main noises generated in the gas tank area include mechanical noise and aerodynamic noise and the main noise sources are pressuring machines, dedusting fans, pumps and release devices of safety valves on tank release pipes. The strength of main noise sources without any noise control measures under normal conditions are more than 85dB(A), please refer to Table 6.3-1.

Table 6.3-1 Strengths of project noise sources

No.: Noise Sources Source

Intensity dB(A)

Controlling Measures Noise amount dB(A)

1 Gas pump 93 Mufflers 30

2 Compressor 95 Mufflers, Damping Materials, Sound-isolation 30

3 Dust removing blower 92 Mufflers, Sound-isolation 30 4 Oil pump station 90 Damping, Sound-isolation 30 5 Cooling tower 85 Urban, Semi-sealing 25



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6.3.2 Patterning treatment of sound energy attenuation Main attenuation factors, including shielding effects of space enclosing structures of factory buildings where various noise sources are located, the distance attenuation between noise sources and sound receiving positions, and air absorption, etc, are only considered in the process of forecast. Normal noise reduction measures are considered for various noise source intensities.

6.3.3 Forecast model Noises caused by the factory are industrial noises. According to Technical Guidelines for Environmental Impact Assessment---Acoustic Environmentacoustic environmental impact (HJ/T2.4-1995), the forecast model is adopted as follows: Calculation model of the noise pressure level of multi noise sources

∑=1i

1.0 Ai10lg10 LAL ＝总

In the equation, 总ALrefers to total sound pressure level of some point by adding n sound sources

together (dB);

AiL Refer to the equivalent sound level of No. i sound source to certain forecast point. The geometric divergence attenuation model of point sound sources

Lr=Lo－20lgr－ΔL In the equation, Lr — Sound pressure level of the estimated point, dB(A);

Lo: the strength of noise sources, dB(A)； r: the distance between the forecast point and the noise source, m; ΔL: the attenuation caused by various factors, dB(A).

6.3.4 Results of noise forecast (1) The result of noise attenuation of various equipment Main noise attenuation calculation results for devices of this project (before measures for noise control are taken)

Table 6.3-2b Main noise attenuation calculation results for devices of this project (after measures for noise control are taken)

The sound pressure level (dB) of the noise source after the attenuation of certain distance (m) Noise

Sources

Adopted data (dB) 10 20 40 60 70 80 100 200 300

Gas pump 63 32.02 26.0 19.98 16.46 15.12 13.96 12.03 6.0 2.48 Compressor 65 34.02 28.0 21.98 18.46 17.12 15.96 14.03 8.0 4.48

Dust removing

blower 62 31.02 25.0 18.98 15.46 14.12 12.96 11.03 5.0 1.48

Oil pump station 60 29.02 23.0 16.98 13.46 12.12 10.96 9.03 3.0 0

Cooling tower 60 29.02 23.0 16.98 13.46 12.12 10.96 9.03 3.0 0



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(2) Values at boundaries of the factory. According to the results of field monitoring and combined with layout plan of the station yard, the forecast results are shown in Table 6.3-3a\b



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Table 6.3-3a Noise forecast values at boundaries of the project (before noise control measures are adopted). Unit: dB(A)

The sound pressure levels of various survey points in daytime. The sound pressure levels of various survey points in nighttime.

No. Current values Forecast values

Adding the background

value

Exceeding the standards

Condition

Current values

Forecast values


value

Exceeding the standards Condition

N1 53.5 50.02 57.96 Qualified 51.2 50.02 53.66 Qualified N2 53.8 50.77 55.55 Qualified 51.5 50.77 54.16 Qualified

N3 55.8 56.04 58.93 Qualified 53.6 56.04 58

Exceeding the standards

N4 54.8 52.52 56.82 Qualified 50.2 52.52 54.52 Qualified Standard 65 55

Table 6.3-3a Noise forecast values at boundaries of the project (after noise control measures are improved). Unit: dB(A)

The sound pressure levels of various survey points in daytime. The sound pressure levels of various survey points in nighttime.

No. Current values

Forecast values


value


Current values Forecast values Adding the background

value


N1 53.5 20.38 53.50 Qualified 51.2 20.38 51.20 Qualified N2 53.8 21.57 53.80 Qualified 51.5 21.57 51.50 Qualified N3 55.8 26.40 55.80 Qualified 53.6 26.40 53.61 Qualified N4 54.8 22.88 54.80 Qualified 50.2 22.88 50.21 Qualified

Standard 65 55



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The boundary standard of the project shall comply with the specifications of class III Standard of Noise at Boundary of Industrial Enterprises(GB12348-90), that is to say, 65dB(A) in daytime and 55dB(A) in nighttime. According to Table 6.3-3a and Table 6.3-3b, after this project is put into operation, the impact of noise is relatively large at night before noise control measures are taken, while estimation values of all monitoring sites together with background values are consistent with class III standard after control measures proposed in engineering analysis re taken. Hence, there will be no impact on the acoustic environment.

6.4 Solid waste environmental impact assessment Industrial solids wastes generated from the project operation include: (1) Adsorbent S1 changed in the industrial coke oven gas purification station is approximately 140t/time (changed one time in two years), including 50t/a of desulfurating agent, which is transferred to the coking plant for recycle, and approximately 90t/a of porcelain fills, CAN-110 and CAN-229, which is recycled by the manufacturer and not discharged outside. (2) Adsorbent S1 changed in the civil coke oven gas purification station is approximately 75t/time (changed one time in two years), including 30t/a of desulfurating agent, which is transferred to the coking plant for recycle, and approximately 45t/a of porcelain fills, CAN-110 and CAN-229, which is recycled by the manufacturer and not discharged outside. So, no environmental impact issues are generated from solid wastes in this project.

6.5 Assessment of ecological environment impact After the gas tank area is put into service, “zero discharge” of the industrial wastewater, domestic wastewater and initial rain water can be reached and all the solid wastes will be recycled. Only fugitive emission is applied in normal working conditions. The content of CO in the discharged gas equals to about 4.425kg/h which is far lower than that specified in relevant national standards by referring to operation monitoring results of existing gas tanks. The abnormal working conditions occur once every six to eight years, the discharge is small and the duration is short, thus it will not impact the ambient ecological environment of gas tank area.



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7. Environmental Impact Analysis for Construction Period The construction of this Project includes main works (production workshop), auxiliary works (auxiliary production workshop), environmental protection public works, etc. They are planned to be constructed immediately after approval of the project and completed of civil construction and equipment installation within about 24 months. After completion of construction, trial run will start. During the construction period, various construction activities will inevitably have damage to and an influence on the surrounding environment, and sources that cause the damage and influence mainly include sewage, dust, noises, and solid wastes, wherein the most significant factors are dust and construction noises.

7.1 Environmental impact analysis for the construction sewage.

Wastewater produced in the process of construction mainly include:

(1) Construction wastewater: mainly including muddy water produced from surface excavation and construction of main works, and cooling water and washing water containing oil produced by various construction machineries.

(2) Domestic wastewater: produced by construction personnel, including water for dining room, washing and toilet. According to the data of similar projects, the number of construction personnel is about 150. If per capita daily water consumption is about 0.2m3 and the discharge rate is 80%, and then the daily discharge of water is about 24m3. Refer to the discharge concentration of domestic wastewater of similar projects to determine parameter values of the sewage quality, wherein COD is determined as 150mg/L, BOD5 100mg/L, ammonia nitrogen 50mg/L and SS 300mg/L. According to above parameter values, the discharge amount of domestic wastewater produced during the construction of the project is estimated as shown in Table 7.1-1.

Table 7.1-1 Discharge amount of domestic wastewater produced during the construction of the project

COD BOD5 Ammonia Nitrogen

SS

Concentration (mg/L) 150 100 50 300 Daily discharge amount (kg/d)

3.6 2.4 1.2 7.2

No construction camp is set at the construction site, and SGIS Company will provide dormitories for all construction personnel, so domestic wastewater will be discharged into the domestic wastewater system of the company. (3) Wastewater from construction site cleaning: though it does not contain poisonous, harmful pollutants, it may contain much soil, sand and a certain amount of oil. The amount of the above mentioned sewage produced during construction is not large. Setting collection tanks and grit chambers at the construction site may effectively reduce the environmental influence of construction sewage and washing sewage on the construction site. Generally, after the adoption of the above mentioned sewage control measures during construction period, the project has a small influence on the surrounding water areas.

7.2 Environmental impact analysis for the construction dust Atmospheric pollution sources during construction mainly include the scattering dust produced in the process of mechanical excavation, embankment, loading and unloading, mixing and transportation as well as the second dust produced in the process of transportation. Refer to Table 7.2-1 for analogy investigation results of the amount of discharged dust produced by various construction activities. The dust produced by the transportation of trucks on temporary roads as well as by the construction site are main sources of



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scattering dust during construction.

Table 7.2-1 Analogy investigation results of the amount of discharged dust produced by various construction activities

Construction area Types of construction activities Amount of discharged dust ((kg/d) Excavation by excavators and bulldozing 36

Surface excavation Loading of trucks 0.48 Wind erosion at the construction site 36.5

Soil filling area at the construction site

Unloading of material movers 0.75

Wind erosion at the construction site 46.1 Loading of trucks 0.48

Temporary soil stockpiling site in construction area

Unloading of trucks 0.75

Bulldozing 36 Wind erosion at the construction site 36.5

Transportation routes inside and outside the construction

site

Driving of transportation vehicles on temporary roads

432

Driving of transportation vehicles on concrete roads

213

Dust pollution during construction is mainly determined by factors such as operation modes of construction, stockpiling of materials and wind force, wherein wind force is the most significant factor. Under a normal meteorological condition, average wind speed is 2.5m/s, TSP concentration at the construction site is 2-2.5 times than that at windward contrast points; the influence range of dust produced by construction will reach 150m around in the down wind direction, and the average TSP concentration at the range may reach about 0.49mg/m3. When construction fences are set, the influence range under the same condition may reduce by about 40%. When the wind speed is more than 5m/s, the TSP at the construction site as well as at the down wind range will exceed the Class III standard value specified in the air quality standard; moreover, with the increase of the wind speed, the degree and range of the pollution caused by construction dust will be correspondingly increased and enlarged With good atmospheric diffusion condition of local area and the adoption of reasonable and feasible control measures, the influence of dust and the influence range may be reduced to a certain degree. Main control measures include: (a) To ensure the scientific management and civilized construction at the construction site. Sand and gravel shall be stockpiled together; cement shall be stockpiled in special warehouses, reduce carrying operation as far as possible, and be careful for the carrying in order to prevent the breakage and bale-off of cement packages. (b) During excavation and removing, spray suitable amount of water on working surfaces to keep the humidity to a certain degree in order to reduce scattering dust. Moreover, excavated soil, removed construction materials and construction garbage shall be removed in time. (c) Ensure that transportation vehicles shall not be overloaded. Measures including covering and sealing shall be adopted to reduce the scattering along the way. Timely clean the mud and dust scattered on roads; clean wheel tires and vehicle bodies; spray water regularly to reduce dust produced in the process of transportation. (d) During the field construction of mixing mortar and concrete, be careful not to spill, leak, leave or empty the mixed materials as far as possible; concrete mixers shall be arranged in a shed and spraying and dust reduction measures shall be adopted during mixing. (e) Fences or part fences shall be set at the construction site in order to reduce as far as possible dust diffusion range and the influence of dust on residents living nearby. When the wind speed is too large, construction operation may be stopped and measures such as covering shall be adopted for construction



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materials such as stockpiled sand and gravel. After the adoption of air pollution control measures during the construction period, there is minor influence of the project on environment

7.3 Impact analysis for construction noises (1) Assessment scope and assessment standards During the construction, the assessment scope of acoustic environmental impact includes the range of 50m surrounding the construction site of the proposed project as well as the construction machinery. Noise Limits for Construction Sites (GB12523-90) will be adopted for the assessment.

Table 7.3-1 Main tasks during the construction

No.: Construction tasks Main activities 1 Support facilities for the field

construction Build boundary fences and on-site offices

2 Site construction (cut and fill) Foundation excavation, bulldozing and compaction with rollers

3 Site preparation Site preparation and excavation, excavation with excavators and earthmoving with trucks

4 Load and transport system of construction batches

Proportioning of concrete, mixing with mixers, loading and unloading with lift trucks, etc.

5 Soil quarrying and transportation of waste slag.

Soil quarrying, transportation of waste slag and loading and unloading.

Table 7.3-2 Various construction equipments and noise source strength (dB) at different distances

Features of noise sources

--Forecast values of noise sources No.: Types of machines

5m 10m 20m 40m 70m 100m 1 Wheel loaders Unstable sources 90 84 78 72 70 64 2 Grader Mobile unstable

sources 90 84 78 72 70 64

3 Three-wheel road rollers Mobile unstable sources

81 75 69 63 61 55

4 Three-wheel road rollers Mobile unstable sources

76 70 64 58 56 50

5 Viberating road rollers Mobile unstable sources

86 80 74 68 66 60

6 Double-wheel vibratory rollers

Mobile unstable sources

81 75 69 63 61 55

7 Bulldozer Mobile unstable sources

87 81 75 69 67 61

8 Hydraulic excavators Unstable sources 85 79 73 67 65 59 9 Water pump Fixed stable sources 84 78 72 66 64 58 10 Vibratory pile drivers Unstable sources 87 81 75 69 67 61 11 Pneumatic hammers and

rock drills Unstable sources 98 92 86 80 78 72

12 20T and 40T tippers Mobile unstable sources

97 91 85 79 77 71

13 Trucks Mobile unstable sources

91 85 79 73 71 65

14 Fork-trucks Mobile unstable sources

95 89 83 77 75 69

15 Fork lifts Mobile unstable 82 76 70 64 62 56



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sources 16 Concrete mixers and

batching machines Fixed stable sources 91 85 79 73 71 65

17 Concrete pump Fixed stable sources 85 79 73 67 65 59 18 Mobile cranes Mobile unstable

sources 96 90 84 80 78 70

(2) Investigation of noise sources during construction period The main tasks of construction see Table 7.3-1 There are many conventional equipments used during construction. According to investigation, the machinery and equipments used in the existing construction include excavator, earth scraper, bulldozer, road roller, agitator, and loading vehicle, etc. Table 7.3-2 The noise-source intensity distribution a of various construction machinery. (3) The prediction on acoustic environmental impact during construction period The prediction on noise source during construction period will usually be predicted and calculated as point source. The noise value in sensitive areas with different distances from the noise sources can be estimated according to the decay mode of point source. Prediction model is as following:

( )00

log20 rrarrLL poAeq −−⎟

⎠⎞⎜

⎝⎛−=

( )00

log20 rrarrLL poAeq −−⎟

⎠⎞⎜

⎝⎛−=

In the equation, LAeq is the predictive value of construction noise at a distance r [dB (A)];

Lp0 is the reference sound level[dB (A)] at r0 metres from the noise source. a is the decay constant, dB (A); r is the distance from the noise source, m; r0 is the distance of the reference point, m;

⎟⎠

⎞⎜⎝

⎛= ∑

=

n

i

LAeq

AL1

1.0 eq10log10总

⎟⎠

⎞⎜⎝

⎛= ∑

=

n

i

LAeq

AL1

1.0 eq10log10总

The overall sound pressure level stacked by multiple noise sources is calculated following the equation below: where n is total number of sound sources;

L, the total Aeq, is the overall sound pressure level for a certain point. The noises values of several major types of equipments during construction are substituted in equation above to calculated, which results are listed in Table 10-5. It is very difficult to predict that how many equipments will be actually input at the construction site. It is assumed that there are five kinds of equipments to be used at the same time, after being stacked, the noises generated are used to predict the overall sound pressure level on a certain distance, and the calculated results are listed in Table 10-6.

Table 7.3-3 Predictive noise value of a single equipment (dB) Sequence

Machinery type

Forecast values of noise sources



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No. 5m 10m 20m 40m 50m 100m 150m 200m 300m 400m 1 Bulldozer 87 81 75 69 67 61 57.5 55 51.4 48.9 2 The on-board

crane 96 90 84 78 76 70 66.5 64 60.4 57.9

3 Hydraulic excavators

85 79 73 67 61 55 55.5 53 49.3 46.9

4 Trucks 91 85 79 73 71 65 61.5 59 55.4 52.9 5 Mixor 91 85 79 73 71 65 61.5 59 55.4 52.9

Table 7.3-4 Table 6.6-6 The overall sound pressure level of that multiple equipments run simultaneously arriving at a location of predicted distance.

Distance 5m 10m 20m 40m 50m 100m 150m 200m 300m 400m The overall sound

pressure level dB(A)

98.6 92.6 86.6 80.7 78.6 72.5 69.1 66.6 63.3 60.5

(4) Analysis and evaluation of impact Harm: Although the equipment noise generates during the construction period, it is also great harmful to environment because of its impact feature, some with longer duration and companied by strong vibration. In addition, the equipments input are different with progress of construction. In early phase of construction and stage of leveling ground, driving of transport vehicles and operation of construction equipments are decentralized, which impact of noise belongs to liquidity and volatility, therefore the impact on surrounding environment is not obvious during this stage. Along with the increasing fixed noise sources of subsequent fixed point excavation and construction materials mixing, running time will be longer, which will impact the surrounding environment more and more evidently during this stage. But it depends to a great extent the distance between construction point and sensitive points above as well as the construction duration, the greatest impact are the less distance or construction during the night. However, the acoustic environmental impact during construction period is short comparing with operation period, once the construction activity ends, the construction noise will also come to an end with it. Impact on construction staff: it can be known from results of Table 10.3-3 and Table 10.3-4, under the absence of sound insulation facilities, if a single machine is used in construction, the noise is about 73 to 84dB at about 20 meters from the noise source during daytime, and it will reduce below 70dB at 100 meters from noise source; if multi machines are used in construction, the noise reduces to about 80dB at 40 meters from noise source during daytime, it will reduce below 70dB at about 150 meters from the source noise, and it can reduce below 60dB at the place out of 400 meters; Hence, although the construction noise is at about 40 meters from the noise source, it can achieve basically the daytime noise limit 85dB of hammers when multiple machines are operating, but personnel within the peripheral of 20~150 meters of site scope will bear certain acoustic environmental impact. Impact on sensitive points: in case of no sound insulating facilities and a clear environment from the sensitive points, a single machine produces noise at 60-76dB at 50m during construction, while the noise can reach about 78dB at 50m if multiple machines work, the noise level is about 70dB at 150m and attenuates to about 66dB at 200m. Therefore, the noise of sensitive points within 300 meters around the peripheral of construction point will be in 60~78dB during construction phase. It basically complies with the daytime noise limits according to evaluation of Standard for noise limits for the construction site for urban areas. As there is no environmental sensitive point within 400m of the evaluation scope, the construction noise will not impact the surrounding residents. In addition, villages surrounding transport routes will suffer from acoustic environmental impact from transport vehicles, because the construction will stop at night, the acoustic environmental impact of vehicles is smaller during night anyway. (5) Protective measures In order to reduce environmental acoustic environmental impact during construction period, the following control measures can be taken:



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1) Enhance construction management, arrange reasonably construction time; to stagger the use time of high-intensity noise equipments as far as possible; to prohibit high-noise construction during night operations to reduce possible adverse impact of construction noise. 2) Apply hydraulic tools in stead of pneumatic ones as much as possible to reduce construction noise source intensity. 3) Set up shelters around high noise equipments. 4) Minimize vehicles number in construction area and traffic density as much as possible, control vehicle whistles. 5) Make labor protection well, making workers operating near noise sources wear protective earplugs. Generally, the noise makes less impact to environment during project construction period after control measures above are taken.

7.4 Analysis on environmental impact of solid waste The solid wastes during construction period are work spoil and residue generated primarily from work excavation and living garbage from construction personnel. The following measures can be taken: (1) Since no camp is established, living garbage from construction personnel can be brought into the environmental sanitation collecting and disposal system in plant area for treatment according to the requirements of living quarter,. (2) Since no borrow and spoil field will be established, the construction organ shall make earthwork balance in construction site as far as possible. (3) The construction waste can be piled at specified field temporarily in construction site, and transported outward regularly to location designated for landfill, which is abandoned randomly is not allowed. (4) After finishing construction, the construction site is required to be cleaned up promptly; the temporary building as temporary sheds shall be demolished, and waste materials must be sent to disposal site designated. Since the solid waste produced during construction period is little, it has minor environmental impact after implementing of measures above.

7.5 Analysis on impact of soil erosion 7.5.1 Analysis on environmental impact of soil erosion Wastewater during construction project is mainly surface runoff of the heavy rain, construction wastewater and domestic wastewater. Construction wastewater includes the slurry water generated from processes of foundation and road excavation and workshop construction, cooling and washing water from operation of machinery and equipments; domestic wastewater includes the irrigation water of construction personnel, temporary canteen and toilet. The rainy season is mainly from May to August. The summer rainstorms are concentrated, and rainfalls have high intensity and frequency. These weather conditions bring adverse impact to soil erosion during the construction period of project. As there are works of excavation and fill operation during construction process, scour by rainfall will generate serious soil erosion if control is not enhanced. Scouring of loosen soil, construction sand and gravel, garbage, the surface runoff will not only entrain soil and sand, but also carry various pollutants of cement and a little oil, which will bring short-term impact to quality of surrounding marine water.

7.5.2 The control measure and control scheme on soil erosion During construction, the balance of earth and rock engineering shall be got as far as possible, reducing spoil. The design of drainages, interception of water, preventing from soil erosion shall be made well to prevent water and soil from flowing into surrounding marine area. During construction, the construction plan, construction procedure shall be arranged reasonably, and construction steps shall be coordinated. Excavating work surface shall be minimized during rainy season, in



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order to avoid being scoured directly by rain. During storm period, emergency measures shall be also taken, covering the soil surface excavated newly with mulch as far as possible to prevent from erosion. The soil material shall be tried to be filled with pressure in plant area and road construction site, without leaving loosen soil. Meanwhile, the side ditch is required to be excavated. The filling works shall be concentrated as far as possible avoiding heavy rain period. Catchment and desanding pool corresponding volume and drainage ditch are required to be built in construction site to collect surface runoff and slurry water produced during construction process, which shall be discharged into the drainage ditch after pretreatment of desanding, slag removal and oil separation. During construction, the equipments need to be repaired shall be transferred to the equipment maintenance location designated to repair, in order to avoid oily wastewater to pollute surrounding marine area as far as possible; moreover, temporary toilets shall be set up at construction site, and cleaned regularly, what cleaned out is sent to the disposal site designated. The trucks transporting soil and gravel are required to be maintained well, which shall not be loaded too full in order to ensure not to be scattered out during the transporting process. The clear space not set up with workshops shall be plant trees and turf during construction for afforesting. To conclude, noise, waste gas, wastewater and solid waste will have a certain impact to the environment during construction period, but construction period is not very long, therefore the pollution during construction period is temporary, such kind of pollution can be removed after the end of construction. Environment will not be got adverse impact significantly during construction period, as long as organizational work is done well by construction organ to conduct civilized construction, and implement all environmental protection measures above pressingly.

7.6 Environment supervision during construction It can be known from analysis on environment impact during construction period in sections, certain wastewater (including construction wastewater, domestic wastewater, cleaning wastewater from construction site), waste gas (primarily dust), noise pollution will generate during construction project, and a certain extent soil erosion will result within scope of the project. In order to protect quality of local environment, principal of the Third Party organ with corresponding qualifications is required to supervise the implementation of environmental protection measures(including treatment measures and management system) during construction of the project, i.e. to conduct environmental supervision during construction period, implement mandatorily environmental protective measures, to strengthen environmental management of these infrastructural projects during construction period. Qualified organ shall implement strictly environmental supervision in accordance with the System of Environmental Supervision (Trial) Huan Jian (1996)No. 888. The land used temporarily of borrowing and spoiling field, construction sidewalk newly opened, and temporary resident shall be strengthened to audit. On one hand, the environment supervisor shall strengthen contact with land resource, and environmental protection departments of local government, strengthen monitor, management, and coordination to contractors, particularly eliminating phenomenon of random mining. On the other hand, temporary land used must be audited by the environmental supervising engineer to examine whether its position meets the environmental requirement in accordance with relevant contract documents, laws and standards, on which construction only can be started after completing the examination and verification. During the course of construction, subsections and branch projects must be reported with environmental protection measures before construction. The supervisor will not permit the starting of construction till the environmental supervision engineer signature exams and agrees with signature; the environmental supervision engineer monitors the implementation of environmental protection measures by verification regularly and irregularly; the completion acceptance of subsections and branch projects is required for signature recognition of environmental supervision engineer by the same way. Implementation of week examine, weekly report, and monthly examine, monthly report system, the environmental issues table of construction period the project is worked out, on which will be marked with environmental issues found in daily inspection. The environmental issues dynamic graph shall be drawn according to the issues occurred weekly; the improved monthly examination table shall be worked out, to



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mark implementation effect of environmental protection measures of each type and bid section along the line, analyze comprehensively implementation effect and inadequate aspect of environmental protection measures of each bid section within one month, offering the targeted basis for implementing environmental supervision next step.



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8 Risk Assessment

This project builds one 300,000m3 blast furnace gas tank, one 100,000m3 industrial coke oven gas tank, one 300,000m3 civil coke oven gas tank and two 80,000m3 converter gas tank. The existing gas tanks were out of service after the project operation. This risk assessment is only conducted for the new constructed gas tank area. Pipelines from gas sources to the tank area established in SGIS “Eleventh-five” planning are not included in this assessment. According to the Notice on Risk Assessment of Significant Environmental Pollution Accident Risks No.90 (057) issued by the State Environment Protection Administration, it is required to conduct environment impact assessment for significant environmental pollution accident risks. Notice on Strengthening Environment Impact Assessment Management and Preventing Environment Risks (Huan Fa [2005] No.152) issued by the State Environment Protection Administration provides that environment impact assessment must be conducted for construction projects involving poisonous and harmful substances in accordance with relevant requirements such as Guidelines on Environment impact assessment of Construction Project, with detailed requirements as listed below: (1) Environment impact assessment must be conducted for newly-built chemical and petrochemical construction projects and other construction projects involving poisonous and harmful substances, in accordance with Guidelines on Environment impact assessment of Construction Project. (2) As to expansion and technical renovation projects, the environment impact assessment of the original works should be supplemented, and such improvement measures as "substitution of the new for old", correction, relocation and shutdown shall be proposed for the environment risks that exist. (3) The EIA conclusion shall be one of the main basis for affecting the approval of the EIA documents of construction project. Any EIA document of construction project without EIA chapter shall not be considered; through reasoning, if the EIA of a construction project is not perfect in content or there exist significant environment risks, the EIA document shall not be approved. (4) If emergency pre-plan of environment risk and accident prevention measures are not implemented, "three simultaneity" acceptance of construction project shall not be conducted. EIA shall be conducted for the Project according to the requirements above and in combination with Technical Guidelines for Environmental Risks Assessment of Construction Project (HJ/T169-2004). Through risk identification, analysis and consequence prediction, risk prevention measures and emergency plans shall be proposed for the Project, and technical decision basis shall be provided for the Project to promote works construction and minimize environment risk.

8.1 General principles 8.1.1 Assessment Objective EIA shall be conducted in accordance with EIA work scheme of the Project. Such process includes data analysis, determining methods recommended by the Guidelines, technical mode prediction and analysis, obtaining accident occurrence rate, impact degree and scope. In accordance with acceptable degree of environment risks, accident emergency measures to reduce risks and social emergency plan shall be proposed, prevention distance and migration-relocation scope shall be developed, and data and basis shall be provided for works design and environment management in hope to achieve the objective of reducing risks and public hazards.

8.1.2 Assessment Grades In accordance with grade judgment of assessment in Technical Guidelines for Environmental Risks Assessment of Construction Project (HJ/T169-2004), the raw materials and products of the Project contain multiple inflammable, explosive and poisonous chemical substances. It can be judged according to Identification of Significant Hazard Sources GB18218-2000 that, the main substance CO of blast furnace gas, converter gas, and coke oven gas in the Project belongs to a significant hazard source (see section 12.3



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for details), in combination with Table 8.1-1, its risk assessment grade is grade one.

Table 8.1-1 Assessment work grade( grade 1, 2)

Hypertoxin risk Substances

Dangerous substances of

general toxicity

Combustible, flammable Dangerous substances

Explosion hazard Substances

Non-significant risk source I II I I

Non-significant risk source II II II II

Environmentally sensitive areas I I I I

8.1.3 Scope and Focus of Assessment The scope of the assessment: risk assessment of ambient air quality shall be based on the requirements of the Ministry of Environmental Protection of the People’s Republic of China [2006] No.4 document and its Guidelines, which determine a range of 5km from the source point. See Fig8.1-1 The scope of surface water risk assessment shall be determined on the water body based on an enterprise’s final program for wastewater emission, ; The focuses of the assessment: environmental risks to the atmosphere, soil, water and health risks to the public and employees due to leakage, spills, fires of flammable, toxic materials; based on the assessment results, protection distance requirements and relocation range shall be proposed and measures taken for prevention, mitigation and emergency responses.

8.1.4 Assessment Methods Through risk analysis, such measures as analogue analysis and simulation calculation are proposed to predict the impacts from the possible consequences caused by heat radiation of fire, leakage of poisonous substances in the Project. Prediction shall be made on leakage and spread of toxic substances in a way as recommended by the Guidelines, as well as the identification of hazardous and endangered regions. At the same time, the consequences to humans of the accident shall be assessed taking into account the different concentrations of toxic substances, in order to determine hazardous or endangered regions and take necessary safety precautions. A fire injury model is proposed to calculate the heat flux at different distances in a fire accident, at the same time, the degree of accident impact shall be analyzed by referring to exposure limit that a fire impacts human bodies.



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Figure 8.1-1 EIA scope of gas tank project

8.2 Identification, Analysis and Environment Sensitive Elements

8.2.1 Identification & Analysis of Environment Air Sensitive Targets In accordance with Technical Guidelines for Environmental Impacts Assessment of Construction Project (HJ/T169-2004) and Huanban [2006] No.4 document, a key atmospheric protection objective is determined in the impact assessment to be population-concentrated residential area within 5km from the boundary of the Project, and the area of social concern, as shown in Table 1.4-2. In combination with Table 1.4-1 and Figure 8.1-1, it can be seen that within the scope of 5km from the boundary of the Project, there are 9 residential areas including Shanzibei, Laoxiaojiang, Xinxiaojiang, Taiping Village, Liantang Village, Yumin Village, Shuibei Village, Dayuantou and Meihuazhai in which about 3000 people live, and also Maba No.3 Elementary School and Shaogang No. 1 Middle School, totaling about 2000 people.

8.2.2 Identification and analysis of water environment sensitive targets In consideration that relevant emergency measures fail to be taken in an accident, fire water may be discharged into the water system near a discharge outlet. Therefore, sensitive targets of water environment in this EIA mainly include water ecological environment and living resources of Meihua River near discharge outlet, as shown in Table 1.4-2.



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8.3 Identification of environment risks of the Project

8.3.1 Material hazard identification of the Project For the relevant parameters, including flash point, melting point, boiling point, spontaneous ignition temperature, explosion limit, degree of danger, and danger category, of raw materials, supplementary materials, and products involved in the Project, see Table 8.3-1. Data in the Tables coming from : Safety Data Sheet for Chemical Products; Grade of Hazard Degree of Occupational Contact to Poisons GB5044-85; User Manual for Hazardous Chemical Products; A Toxicity Book of Chemical Substances Dangerous Chemicals List (2002 version).



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Table 8.3-1 Danger and poison analysis for main materials, supplementary materials, and products involved in expansion

project Toxicity Flash point Boiling point Explosion limit %(v) LD50 LC50 No.: Mediums title Phase pattern

Upper limit Lower limit

Severity category

Category of fire severity mg/kg mg/ m3

Poison grade

1 CO Gas -191 12.5 74.2 Item 2.3: toxic gas 2069 III

2 Carbon dioxide Gas -78.5 / / Item 2.2: non-combustible nontoxic gas

3 Methane Gas -182.5 -161 5 15 Item 2.1 combustible gas

Grade I, level A 207

4 Hydrogen Gas Meaningless -252.8 4.1 74.1 Item 2. combustible gas

Grade I, level A -- -- --

5 Hydrogen sulfide Gas -60 4.3 46 Item 2.3: toxic gas 618 III

Note: refer to Chemical Dangerous Articles Manual, Safety Manual for Petrochemical Materials and Products (1)

Table 8.3-2 Hazards of main dangerous substances in all gas components and their emergency measures Dangerous substances

Major hazards Contingency measures and measures to eliminate toxicity

CO Danger mark: 4 (combustible gas) invasion path: inhalation. Health hazard: CO combines with the hemoglobin in the blood and results in oxygen deficit in the tissues Acute poisoning: causing headache, vomiting and inability in the lightly-poisoned. In moderate poisoning, the patient may fall into a coma in addition to the above symptoms. Patients with severe poisoning may become unconscious with symptoms of narrowed pupils, increased muscle tension, frequent seizures, incontinence, etc. Severe poisoning can be fatal. Acute toxicity: LC502069mg/m3, 4 hours (inhalation by rat ) Pollution sources: The main sources of CO pollution are coke smelting,

Emergency measures in case of leakage: rapid evacuation of personnel in the leakage / contaminated areas and move upwind of the release point, immediately cordon off and keep a distance of 150 m, strictly restrict access. Cut off source of ignition. Cut off source of leakage as far as possible. Reasonable ventilation to accelerate dispersion. Use water spray (fog) to dilute and dissolve the leaking gas. Build a dike, or trenching, to collect large volumes of wastewater generated. If possible, use exhaust fan to transport leaking gas to an open area or install a suitable nozzle to burn it. A pipeline may be used to conduct the gas to a furnace or a concave area to burn it. The leaking container should be handled properly, and reused only after repair and test. Protective measures: when concentration in the air exceeds standard level,



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steel smelting, iron smelting, and mine blasting of the metallurgic industry; synthesized ammonia, synthesized methanol, and graphite electrode manufacturing of carbon factories of the chemical industry. CO gas is produced by automobile exhaust, gas furnace, and the incomplete combustion of all carbonic substances (including those from family coal stove). Hazards characteristics: It is a flammable and explosive gas. If mixed with air, an explosive mixture can be formed and may cause combustion and explosion if coming in contact with fire or excessive heat. Combustion (decomposition) products: carbon dioxide.

wear self-inhalation filter type protective gas mask (half-mask). In emergency rescue or evacuation, it is recommended to wear air respirators, filter self-rescuer for carbon monoxide. Emergency measures: Inhalation: immediately escape from the site of exposure to a place with fresh air. Keep the respiratorytract unobstructed. For breathing difficulty, feed oxygen. For respiratory or cardiac arrest, immediately make use of artificial respiration and external chest cardiac massage. For medical treatment. Fire extinguishing method: cutting off gas source. If the gas source cannot be immediately cut off, it is not allowed to extinguish burning gas. Spray water to cool the container, and, if possible, move the container from the site of fire to an open space. Fire extinguishing agent: mist of water, foam, carbon dioxide, dry powder.

CO2 Invasion path: inhalation. Health hazard: at low levels, it stimulates the respiratory backbone; at high levels, it inhibits and even paralyzes the respiratory backbone. Hypoxia is also found in the poisoning mechanism Acute intoxication: when one enters an environment with a high concentration of carbon dioxide, he/she quickly faints and falls in several seconds, and in more severe cases, he/she stops breathing, suffers a shock or even dies.

Fire extinguishing method: it is noncombustible. Cut off the gas source.

N2 Invasion path: inhalation. Health hazard: an excessive concentration of nitrogen in the air reduces the pressure of inhaled oxygen and results in oxygen deficit and suffocation.

Fire extinguishing method: it is noncombustible. Cut off the gas source

H2 Danger mark: 4 (combustible gas) invasion path: inhalation. Health hazard: this compound is an inert gas physiologically, and results in suffocation due to the reduction of the oxygen pressure in the air only at high levels of concentration.

Fire extinguishing method: cutting off gas source. If the gas source cannot be immediately cut off, it is not allowed to extinguish burning gas. Spray water to cool the container, and, if possible, move the container from the site of fire to an open space. Fire extinguishing agent: mist of water, foam, carbon dioxide, dry powder.

CH4 Number of hazardous goods: 21007 Invasion path: inhalation; Health hazards: Methane is basically non-toxic for humans, but in excessive concentrations, it may cause

Fire extinguishing method: cutting off gas source. If the gas source cannot be immediately cut off, it is not allowed to extinguish burning gas. Spray water to cool the container, and, if possible, move the container from the site of fire to an open space. Fire extinguishing agent: mist of water, foam, carbon dioxide,



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asphyxiation due to a significant drop of oxygen content in the air. Danger characteristics: it is combustible, and turns into an explosive mixture when mixed with the air. It is vulnerable to combustion and explosion when

encountering heat sources and open fires. Combustion (decomposition) products: carbon monoxide, carbon dioxide.

dry powder.

H2S Invasion path: inhalation. Health hazard: this compound is an intensive neural toxin, and has a strong stimuli to mucous membranes. Strong nerve poison, which has a strong stimulating effect on the mucosa.LC50618mg/m3 (inhalation by rat). It belongs to the highly toxic substance. Inhalation of high concentrations of H2S causes tears, eye pain, visual fuzziness, sensation of throat burning, cough, chest tightness, headache and vague awareness, etc. Some patients may have myocardial damage. In severe cases, cerebral edema and pulmonary edema may appear. Exposure to excessive high concentration (above 1,000 mg/m3) of the gas may cause sudden coma in a few seconds, respiratory and cardiac arrests, and die. Eye mucous membrane exposure to high concentration of the gas causes edema and corneal ulcer. Long-term, low concentration exposure causes neurasthenic syndrome and autonomic dysfunction.

Rapid evacuation of personnel in the leakage / contaminated areas and move upwind of the release point; immediately cordon off the area; for minor leakage, a distance of 150m, for major leakage, 300m, strictly restricts access. Cut off source of ignition. Recommend the emergency personnel to wear positive-pressure self-contained respirator and gas protective clothing. Approach the site from upwind. Cut off source of leakage as far as possible. Reasonable ventilation to accelerate dispersion. Use water spray (fog) to dilute and dissolve the leaking gas. Build a dike, or trenching, to collect large volumes of wastewater generated. If possible, use exhaust fan to transport the remaining gas or leaking gas to a water-washing tower or a ventilation cabinet connected to the tower. Or make it pass through ferric chloride aqueous solution in a pipe which is equipped with a back-brake device to prevent the solution sucking back in. The leaking container should be handled properly, and reused only after repair and test.

Benzene Invasion path: inhalation, ingestion, transdermal absorption. Health hazard: highly concentrated benzene can anesthetize the central nervous system and cause acute poisoning; contact with benzene for long time can damage the hematopoietic system and cause chronic poisoning. Acute poisoning: drunk status including headache, faint, sickness, vomiting, slight excitement, stagger in mild cases; coma, seizure, lower blood pressure and even respiratory and circulatory failure in severe cases. Chronic poisoning: mainly present as neurasthenic syndrome; change of hematopoietic system: less leucocytes and platelets, emerging obstacle anemia of the patients; leukaemia (mostly acute granulocytic) can be caused after chronic poisoning in rare cases. It can cause skin damages including degreasing, drying, chapping, dermatitis, and can also cause increased menstrual amount and extended menstrual period.

Quickly evacuate the personnel in the polluted area to the windward spot, isolate the area, and strictly restrict entry and exit. Cut off source of ignition. It is recommended for the emergency personnel to wear positive-pressure self-contained respirator and gas protective clothing. Do not directly contact the leakage. Cut off the source of leakage as far as possible and prevent it from entering limited space like sewerage and drainage ditch. For leakage of small amount: use active carbon or other inert materials to absorb the leakage, or use emulsion made of noncombustible dispersants for washing and put the diluted washing fluid into wastewater system. For leakage of large amount: build a dike, or trenching, for containment; cover it with foam to reduce the hazard of steam. Spray mist of water to cool and dilute the steam, protect on-site personnel and dilute the leakage to noncombustible substance. Transfer it to tanker or special collecting container by explosion-proof pump. Recycle or transport it to waste disposal field for treatment. In case the leaked benzene enters the water body, immediately build dike to cut the flow of polluted water body, and then conduct necessary treatment; in case leaked benzene enters



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soil, immediately collect the involved soil completely and move them to open field to let the benzene volatize.

Ammonia Invasion path: inhalation. Health hazard: stimulating mucous membranes in case of low concentration; causing lytic necrosis of tissues in case of high concentration. Acute poisoning: in mild cases, causing lacrimation, pharyngodynia, hoarseness, stethocatharsis, etc.; causing hyperemia and edema of eye mucous membrane, nasal mucosa, pharynx; with its chest X-ray signs in conformity with bronchitis or peribronchitis. In medium cases, it causes the worsening of above symptoms, causing respiratory difficulty and cyanosis; with its chest X-ray signs in conformity with pneumonia or interstitial pneumonia. In severe cases in can cause toxic pulmonary edema, or respiratory distress syndrome, with the patients’ violently coughing, expectorating large amount of pink frothy sputum, having respiratory difficulty, delirium, coma, shock, etc. it can cause laryngeal edema or suffocation due to necrosis and exfoliation of the bronchial mucosa. Highly concentrated ammonia can cause reflex respiration arrest. Liquid ammonia or highly concentrated ammonia can cause ocular burns and liquid ammonia can cause skin burns.

Quickly evacuate the personnel in the polluted area to the windward spot, isolate the area within a 150m radius, strictly restrict entry and exit, and cut off the source of ignition. It is recommended for the emergency personnel to wear positive-pressure self-contained respirator and gas protective clothing. Cut off the source of leakage as far as possible. Provide appropriate ventilation to accelerate dispersion. Spray mist of water containing hydrochloric acid for neutralization, dilution and dissolution in leakage areas of high concentration. Build a dike, or trenching, to collect large volumes of wastewater generated. f possible, use exhaust fan to transport the remaining gas or leaking gas to a water-washing tower or a ventilation cabinet connected to the tower. Diluted acid spraying facilities are better available in the tank storage area. The leaking container should be handled properly, and reused only after repair and test.

Cyanide (in reference to

sodium cyanide)

Invasion path: inhalation, ingestion, transdermal absorption Health hazard: inhibiting respiratory enzyme, causing intracellular suffocation. Inhalation, ingestion or transdermal absorption of cyanide can cause acute poisoning. Long time contact with little amount of cyanide can cause neurasthenic syndrome, stimulation of eyes and upper respiratory tract, and can also cause skin rash.

When treating the leakage, always wear masks and gloves, sweep and invert the leakage to large amount of water. Put in excessive NaClO or bleaching powder and place it for 24 hours until the cyanide is confirmed as fully decomposed, then dilute and put it into the wastewater system. For polluted areas, apply NaClO solution or bleaching powder and place them exposed to light for 24 hours, then wash with large amount of water, which, after used, will be put into wastewater system for unified treatment.



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In combination with Table 8.3-1, and Section 3.1.1 Gas property analysis, it can be known that blast furnace gas and converter gas contain CO with high content, 26.3% and 67.5% respectively. Through poison property analysis, CO is selected as a target for poison leak analysis. Coke oven gas contains H2 of highest content, up to 58.2%, and is taken as a target for fire explosion analysis.

Microcontent factors of benzene, ammonia and cyanide are not included in this assessment. Determine the maximum credible accident relevant to the material selected.

8.3.2 Hazard identification of the Project area Gas tank area mainly consists of 1 set of 300,000 m3 blast furnace gas tank, 1 set of 100,000 m3 industrial coke oven gas tank, 1 set 30,000m3 civil coke oven gas tank, 2 sets of 80,000m3 civil converter gas tanks and electric dedusting facility for converter gas, 1 set of compressor station for mixed gas and converter gas, 1 set of coke oven gas compressor station and 1 set of gas mixing station.

8.3.2.1 New dry gas tank (POC) Blast furnace gas tank, industrial coke oven tank and civil coke oven tank are new dry gas tank. The SGIS built the first 10*104 m3 POC dry blast furnace gas tank in May 1999. Its operation data shows that the main potential risks for such tank is corroded hole which causes leaks of gas:

(1) Valve joints of gas pipe to gas tank: corrosion, aging, leaking; (2) Corroded holes found at welding part of gas tank body; (3) Degeneration of seal oil causes poor sealing effect and then gas leaks; (4) Oil pump failure causes difficult supply of sealing oil, which will not happen if there are standby

pumps. Among four potential risks above, sealing oil quality and oil pump station operation can be solved through regular inspection. Corroded hole is relatively hidden and hard to check, thus represents a high risk. Therefore, the main potential risks of such gas tank include leaks of blast oven gas caused by corrosion perforation, which may result in fire and explosion once fire source exists. Main reasons for corrosion include: CO2 Corrosion of gas tank steel plate CO2 Gas dissolves in water, which produces H2CO3, and the following reaction takes place between H2CO3 and Fe under normal temperature: Fe + H2CO3=FeCO3 +2H+

Steel plate corrosion accelerates with the dissolution of CO2 which produces acid water film, also with increment of CO pressure.

Corrosion of H2S to gas tank steel plate Gas contains a small amount of H2S, which causes drastic corrosion to gas tank steel plate if water exists. The main reaction is: H2S+ Fe = FeS+2H+

H2S is a strong corrosive agent, and it can not only accelerate steel corrosion, but aggravate hydrogen penetration into steel. S ion is an effective "damage agent", and it promotes hydrogen penetration into steel to form stress, thus causes hydrogen embrittlement and stress corrosion and damage to steel. Gas tank surface paint damage or deflects in welding seam Electrode corrosion effect tends to form easily on the damaged part of protective film of gas tank surface, and causes hole on the tank body. Deflects caused by welding seam. The welding stress produced by welding heat may cause corrosion. Welding heat affects changes to regional structure, and causes grain coarsening and uneven structure, thus causing damage to its mechanical and corrosion resistance.



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8.3.2.2 Wiggins gas tank Converter gas tank adopts Wiggins gas tank, and its working principle is described in Section 2. In 2001, Xiangsteel company built a 50,000m3 Wiggins gas tank. Its operation data statistics shows that the main potential risk is

(1) Corroded hole in tank body, which is generally found at welding seam. It causes leaks of converter oven gas;

(2) Control valves of gas pipe are corroded or damage, causing gas leaks; (3) The rubber sealing film in the piston system gets degenerated and reduces seal effect, causing

leaks of converter gas. Among four potential risks above, degeneration of rubber can be solved through regular inspection. Corroded hole is relatively hidden and hard to check, thus represents a high risk. Therefore, the main potential risks of such gas tank include leaks of blast oven gas caused by corrosion perforation, which may result in fire and explosion once fire source exists.

8.3.2.3 Electrostatic precipitator of converter gas In order to guarantee the quality of converter gas to be outsourced, 3 wet plate horizontal explosion-proof electrostatic precipitators are designed in the Project, 2 for use and 1 for reserve. Technical equipment are arranged outside and electric control equipment inside. The insulator compartment shall be sealed by nitrogen to prevent the gas leakage, and equipped with the electric heater to prevent the insulator from being damaged by the condensed vapor. The shell shall be provided with the auto-reset explosion valve to release the pressure timely in case of gas explosion accident; the rectifier shall be adjustable and can automatically reduce the voltage to the safe level in case the oxygen content of converter gas exceeds the rated value. Therefore, though there is a potential risk of fire and explosion for the deduster, the risk is effectively reduced.

8.3.2.4 Gas mixing station The gas mixing station is mainly used to mix blast furnace gas (~9.5kPa, 200000Nm3/h) from the general gas pipe in tank area with coke oven gas (~6kPa, 80000Nm3/h) through flow proportion and heat value feedback to form gas mixture from blast furnace and coke oven (~4kPa、280000Nm3/h, 7527kJ/Nm3).

Pressurized gas mixture from blast furnace and coke oven is mixed with pressurized converter gas (~19kPa, 40000~75000Nm3/h, 7527kJ/Nm3) through flow proportion and heat value feedback to form gas mixture from blast furnace, coke oven and converter (~16kPa, 320000~355000Nm3/h,7527kJ/Nm3) to supply mixed gas user in the Plant. Its main potential risk is gas mixer failure which causes leaks of mixed gas. Fire and explosion may be caused in case of a fire source. The potential risk is relatively low due to a small amount of gas.

8.3.2.5 Pressurization station of converter gas Pressurization station of converter gas is intended to pressurize converter gas to 2~2.5kPa, with a flow rate of 75000m3/h. Inside gas station

(1) Blower failure affects operation of pressurization system. Three blowers are provided, 2 for use and 1 for reserve. Reserve blower can be started immediately to guarantee its operation;

(2) Failure of pressurizer causes shutdown of system. The danger degree is relatively low due to its low pressure and low temperature operation condition of 2-2.5kPa\0-72oC. The safety of pressurized gas can be effectively guaranteed through technical design;

(3) Corrosion penetration occurs on the gas pipes and joint valves in the pressurization system, causing leaks of mixed gas.

Meanwhile, 10t electric explosion-proof cranes are provided in the station, its linkage control system allows to effectively reduce accident probability to a certain degree. Its main potential risk is gas leak.



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8.3.2.6 Pressurization station of mixed gas The gas mixture from blast furnace and coke oven with pressure of ~4kPa, cannot serve the mixed gas users within the plant until it is pressured to 18kPa and mixed with converter gas and form gas mixture from blast furnace, coke oven and converter . Its main potential risks may include:

(1) Blower failure affects operation of pressurization system. Three blowers are provided, 4 for use and 2 for reserve. Reserve blower can be started immediately to guarantee its operation;

(2) Failure of pressurizer causes shutdown of system. The danger degree is relatively low due to its low pressure and low temperature operation condition of 4-2.5kPa\0-80oC. The safety of pressurized gas can be effectively guaranteed through technical design;

(3) Corrosion penetration occurs on the gas pipes and joint valves in the pressurization system, causing leaks of mixed gas.

8.3.2.7 Coke Oven Gas Pressurization station It is intended to pressurize industrial coke gas and civil coke gas. Its potential risk is the same as that of pressurization station of mixed gas, i.e. corrosion perforation which may cause leaks of coke oven gas. At the same time, 10t electric explosion-proof cranes and linkage control system are provided in the station, which allows to effectively reduce accident probability.

8.3.3 Identification of major hazard installations

8.3.3.1 Basis on which to identify major hazard installations Major hazard installations refer to units (including venues and facilities) which are engaged in long-term or temporary production, handling, use or storage of Hazardous Goods, the amount of which equal or exceed threshold quantity. "Identification of Major Hazard Installations (GB18218-2000), Technical Guidelines for Environmental Risk Assessment on Projects shall serve as basis for identification. Unit refers to a unit (set) of production equipment, devices or place, or that belonging to same plant and locating at the place where the intervals of these production equipment, device or places are less than 500m. If there exists a single variety of hazardous goods in a unit, the quantity of which shall be deemed as the amount total of hazardous goods in the unit, which, if it equals or exceeds the threshold quantity, the unit is then identified as a Major Hazard Installation. A variety of substances are stored in the Unit with the Project, the calculation of which, if satisfies the following equation, shall categorize the Unit a Major Hazard Installation.

--Actual amount of every kind of hazardous substance in existence, t. -- the threshold quantities of production or storage facilities which correspond to a variety of hazardous substances, t.

8.3.3.2 The result of the identification of major hazard installations The major hazardous sources of the gas tank area are from the gas tanks, which are identified according to the methods of Identification of Major Hazardous Sources. See Table 8.3-3.

Table 8.3-3 Table for Identificating Major Hazardous Sources in Gas tank Area

Category Substance properties Threshold quantity Q Location q / Q

Name of Substance (quantity)



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Category Substance properties Threshold quantity Q Location q / Q

Name of Substance (quantity)

Flash point <28 20 t tank area 12.58 H2(6.84t) 、CO(244.8t)

Combustible liquid in

warehouse area and tank

storage area 28≤ flashpoint ＜

60 100 t Tank area

Highly toxic product 1kg

Toxic product 100kg tank area 2448 CO(244.8t)

Toxic substances in

warehouse area and tank

storage area Hazardous product 20 t

Pressure container ≥0.1MPa，PV≥100

MPa⋅m3

∑q/Q 2460.58

*Combined with the gas storage volume of various gas tanks, with reference to various gas physical properties, the accumulated contents of carbon monoxide and hydrogen gas are calculated in various gas tanks. Identification of major hazardous sources of flammable and explosive substances: In Table 8.3-3, the

sum of flammable liquid Ii Qq in the production site is 12.58, which is not classified as major hazardous source. The only indicator exceeding the critical quantity is 44.8t for CO2. The H2 content is within the critical quantity.

Identification of major hazardous sources Ii Qq in terms of toxic substances: In Table 8.3-3, the sum of all the toxic and hazardous substances in the production site is 2448, which is classified as major hazardous source. The substance exceeding the critical quantity is44.8t for CO2. According to Identification of Major Hazard Installations (GB18218-2000) and Guidance on Supervision and Management of Major Hazard Installations (SAWSS [2004] No. 56), flammable medium of pressurized containers with maximum working pressure100kPa, and pressure containers with PV100000kPa*m3 are major hazard sources. In conclusion, the major hazardous sources of the project are coke oven gas, blast-furnace gas and coke oven gas. The substance exceeding the critical quantity is carbon monoxide. The accident types include explosion, fire and toxicant release.

8.4. Maximum Credible Accident and Pollutants Transfer Route under an Accident Circumstance

8.4.1 Determination of Maximum Credible Accident 8.4.1.1 Maximum credible accident According to the definition of HJ/T-2004 stipulated in Technical Guidelines for Environmental Risk Assessment on Projects, the maximum credible accident refers to the most heavily accident resulted in the environmental (or healthy) damage. While the heavy accident is refer to the accident caused by fire, explosion and leakage of toxic and hazardous compounds, so it brings a serious damage to public and arises a severe pollution problem to environment. Maximum credible accident source term is the setting of release rate and release time under the maximum credible accident for the identified and selected hazardous substance. The accident occurrence is randomness following certain probability distribution. The setting of maximum credible accident is a kind of reasonable assumption based on large amounts of statistic data. The analysis of the gas tanks and the results of major hazardous source identification are shown in Table 8.4-1. It could be ascertained that the



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accident types of the project include fire, explosion and toxicant release. Table 8.4-1 Determination of maximum credible accident for the project

No.: Devices Danger factor Maximum credible accident

1 Blast furnace gas tank

Co in blasting furnace gases

Equipment malfunction, corrosion and perforation of the steel boards of tanks, corrosion or misoperation of pipe valves, and leakage of blasting furnace gases, resulting in CO intoxication.

2 Industrial coke oven gas tank

H2 in coke oven gases

Equipment malfunction, corrosion and perforation of the steel boards of tanks, corrosion or misoperation of pipe valves, and leakage of coke oven gases, the H2 in which results in fires and

explosions when encountering a fire source.

3 Civil coke oven gas tank

H2 in coke oven gases

Equipment malfunction, corrosion and perforation of the steel boards of tanks, corrosion or misoperation of pipe valves, and leakage of coke oven gases, the H2 in which results in fires and

explosions when encountering a fire source.

4 Gas tank of converter

(Wilkins tank)

Co in converter

gases

Equipment malfunction, corrosion and perforation of the steel boards of tanks, corrosion or misoperation of pipe valves, and leakage of blasting furnace gases, resulting in CO intoxication.

8.4.1.2 Probability of maximum credible accident According to the operational log of blast furnace system in SGIS and coke-oven plant between 1991 and 2006, the number of gas-poisoning accidents was totaled to 16. (See the accidents cause summary in table 8.4-2).

Table 8.4-2 SGIS Gas-poisoning Incidents in 1991-2006

Time Location Causes Accident Consequences

Jul. 30, 1991

The angle of No. 1 blast furnace distributor has been maintained.

One maintenance worker has suffered from gas poisoning because of the failing to take the proper protective measures under maintenance (artificial cause), but without injuries and deaths.

One maintenance worker has suffered from gas poisoning but without injuries and deaths.

Dec. 22, 1996

The No. 1 blast furnace has been changed the water pipe connector (tuyere area).

Owing to pipeline leakage and Equipment ageing, one person has been poisoned, but without injuries and deaths.

One person has been poisoned, but without injuries and deaths.

Jan. 12, 1997 The charging floor of No. 4 blast furnace

Owing to the shell of blast furnace has not been welding-repaired and failed to find timely

the poisoning incident has happened but without injuries and deaths.

Apr. 4, 2001 The sealing platform of No. 5 blast furnace

The inadequate sealing caused the gas leakage.

This case has been found timely.

Jul. 9, 2002 The large bell of No. 2 blast furnace

The large bell had not been maintained for a long time, which caused equipment ageing and staff poisoning.

Causing staff poisoning.

Aug. 30, 2002 The south trial rod of No. 1 blast furnace

One worker has suffered from gas poisoning because of the equipment ageing and the older age of No. 1 blast furnace.

One worker has suffered from the poisoning.



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Sept. 9, 2002 The ease cinder outlet of No.5 blast furnace

The gas leakage was due to the artificial negligence of valve control at the time of tapping.

This case has been found and has not caused serious consequence.

Dec. 24, 2002 The bell chamber of No. 1 blast furnace

The blast furnace top is the weaknesses for maintenance.


Feb. 25, 203 The No. 1 blast furnace throat

The furnace throat has not been maintained for a long time, which caused equipment ageing and gas leakage when starting the blast furnace.

/

Dec. 16, 2005 The No. 6 blast furnace top

When the furnace top pressure changed, it is failed to be controled so as to occur the gas leakage.

/

Oct. 22, 1995 Dispersing pipes of NO. 1 coke oven gas

The obsolete equipment and untight sealing caused the gas leakage.


Nov. 10, 1997 Dispersing pipes of NO. 3 coke oven gas



May. 6, 2001 Dispersing pipes of NO. 2 coke oven gas



Nay. 9, 2002 Gas washing pipeline



Jun. 20, 2003 The valve of gas washing pipeline



Dec. 16, 2005

The furnace top leakage of No. 3 blast furnace

The obsolete equipment and the pipeline leakage


Since the coke oven gas has a inflammable and explosive characteristic, in the event of gas-pipeline network accident, which will tend to brings a heavy accident, the possible accidents include: (1) The leakage caused by the external force in collision with the gas pipeline; (2) The leakage caused by the corrosive and ageing gas pipeline; (3) After a long-term running, the pipes quality problems have been revealed, such aswelding scar,

doubleskin and crackles, etc. (4) The fracture of pressure regulator, ventilator and indoor pipelines was caused by various factors, such

as earthquake, the collapse of roof cover plate and heavy raps by workers; (5) The gas pressure has sharp fallen resulted from pipeline fracture, which lead to users tempering

explosion. So the main dangerous facilities and major hazard in coke-oven plant is coke oven gas pipelines with a maximum diameter of 2.6m and a pressure of 100-500mm water column. As seen in table 8.4-2, all accidents have caused staff poisoning but without injuries and deaths, and those who suffered from the poisoning are within 10m of major hazard; the accident consequences have not brought fire, explosion and great environmental loss.



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According to the statistic results of Table 8.4-2 and the results of major hazardous source identification in Table 8.5-1, because all the gas tanks are equipped with safety relief pipe, emergency relief pipe, safety replacement pipe, nitrogen replacement, automatic leakage detection, chain control, etc. (see Table 8.6-1) to ensure the safe operation of various gas tanks, the leakage points which are the most possible to result in accidents are at the cracks/crannies formed with the effects of outside force at the welding lines and corroded parts of pipe sections/gas tank which will lead to gas leakage. Targeting at the object of this risk assessment, the gas tanks, the maximum credible accident is the risk accident possible to be resulted in by gas leakage. The projection assessment is carried out for gas leakage risk.

8.4.1.3 Analysis of source intensity for maximum credible accident According to the recommended formula in Technical Guidelines for Environmental Risk Assessment on Projects (HJ/T169-2004), the gas leaking rate from the gap is associated with its flowage. Therefore, in the middle of calculating the leakage rate, the gas flowage should be initially judged as acoustic speed or subsonic speed, then the former is termed as critical flow and the latter is termed as sub-critical flow. When the gas flowed in the subsonic speed, its leakage rate should be calculated with the formula 2-1:

11

0 12 −

+

⎟⎠⎞

⎜⎝⎛

+=

KK

d KRTMKACQ ρ

11

0 12 −

+

⎟⎠⎞

⎜⎝⎛

+=

KK

d KRTMKACQ ρ

(2-1) When the gas flowed in the acoustic speed, its leakage rate should be calculated with the formula 2-2:

11

0 12 −

+

⎟⎠⎞

⎜⎝⎛

+=

KK

d KRTMKAYCQ ρ

11

0 12 −

+

⎟⎠⎞

⎜⎝⎛

+=

KK

d KRTMKAYCQ ρ

(2-2) In the equation : Y—Gas expansion coefficient; M——molecular weight; ρ—gas density, kg/m3; R—gas constant, J/mol•K; T—gas temperature, K; K——adiabatic exponent of gas. Currently the accident response time for domestic petrochemical enterprises is normally between 10 and 30 minutes. The accident emergency disposal time could be considered as 10min. In addition, according to the recommend from U.S. Environmental Protection Agency (EPA), when calculation of the leakage material caused by the petrochemical fire and explosion, the leakage time should be calculated by ten minutes. The storage of all the gas tanks is under low pressure, which is much lower than the pressure of environmental atmosphere. When there is any crack on the tank, the leakage rate will be slower. The storage pressure of blast-furnace gas is the highest among all the gas tanks, which is 9500Pa; that of Wiggins gas tank is the lowest, 3000Pa. And the Wiggins gas tank is designed with the interlink automatic devices, which means any leakage will be relatively easier to be controlled



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Table 8.4-3 Accident source intensity of various gas tanks

Device name Attention Substances

Leakage time (min)

Leakage rate

amount (kg/s)

Leakage rate (kg)

Release height

(m)

Accident type

Whether the prediction has been

conducted Blast furnace gas tank CO 10 9.14 5479 60 Toxicant

leakage Non

predication Industrial coke oven gas tank

H2 10 1.75 1052 40 Fire Predication

Civil coke oven gas tank H2 10 0.14 84.2 32 Fire Non

predication

Wilkins tank CO 10 5.86 3516 25 Toxicant leakage Predication

Note: According to the investigation of relevant data from Xiangtan Iron and Steel Group Co., Ltd., the biggest crack is as wide as 120mm. Assuming the size of the cracking part is a hole 120×10mm, the CO leakage is predicted. Since the blast-furnace gas tank has the largest storage capacity/leakage, and its emission height is relatively lower, which is possible to have larger environmental impacts, therefore, only the accident status of blast-furnace gas tank is predicted; due to its larger explosion range of 4.1-74.2%, the hydrogen could easily lead to fire and explosion in open conditions, therefore, the fire accidents possible to be resulted in by the leakage of industrial coke oven gas are predicted.



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8.4.2 Transfer routes and hazard forms of pollutants under accident

conditions

Under the presumed accident conditions, the transfer routes and hazard forms of the pollutants are listed in Table 8.4-5.

Table 8.4-5 Routes of Accident Polluting Hazards

Accident type

Accident location

Type of accident impact

Transfer path and hazard mode of pollutants

Fire Gas tank Heat

radiation smokes

Unorganized diffusion lead to property losses and casualties; the fire-fighting water generated will pollute the water area without proper handling.

Explosion Gas tank Blast

projectiles

Unorganized diffusion lead to property losses and casualties; the fire-fighting water generated will pollute the water area without proper handling.

Toxicant leakage

Gas tank Toxin

diffusion Fugitive emission, injuring human body

8.5 Analysis and Forecast on Environmental Risk Impact

8.5.1 Predicting of Fire and Explosion

8.5.1.1 Explosion The leakage diffuses into a broad area and forms the cloud-like flammable gas mixture filling considerable space. After a period of retention, the flammable vapor cloud will be ignited. Due to some special reasons and conditions, the spread of flame is accelerated to generate dangerous positive pressure of explosion shock wave and lead to the explosion of vapor cloud.

The explosion of vapor cloud is usually calculated by the traditional TNT equivalent coefficient method to correlate the explosion energy generated by the accidental explosion with the TNT of certain equivalent. In the TNT equivalent coefficient method, the equivalent TNT mass is related to the total mass of the fuel in the clouds.

The calculation formula for TNT equivalent is as follows:

TNT

ffTNT Q

WQW α=

In which: WTNT——TNT equivalent of vapor clouds, kg；



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Wf——Total mass of fuel in vapor clouds, kg;

α——Efficiency factor of vapor cloud explosion, which indicates the fraction of flammable gases participating in the explosion, normally it is taken as 3% or 4%;

Qf——Fuel heat of vapor, J/kg;

QTNT——Explosion heat of TNT, normally it is taken as 4.52¡Á106J/kg；

For ground explosion, the explosion power is almost doubled due to the ground reflection. Normally it should be multiplied by the ground explosion coefficient, 1.8.

The distance from the explosion centre to the given overpressure could be calculated according to the formula below.

]p/6900)0.0398ln(p/6900)0.7241ln(-exp[3.50313967W.0R 21/3TNT Δ+Δ=

With the above equation, it could be calculated that:

0.0796

)0.3967W

Rln(-(3.5031*0.1592-0.524321-0.72416900exp(p

3/1TNT=Δ

In which: R——distance，m；

Δp——Overpressure value at the target location, Pa；

2) Explosion damage

The damage efficiency of the overpressure is shown in Table 8.5-1.

Table 8.5-1 Damage effects of explosion overpressure Overpressure

Psi kPa Expected hazards

0.1 0.69 Small window damage 0.15 1.035 Typical pressure that causes glass damage 0.30 2.7 10% of the glass breaks 0.5 3.45 Window damage, modest damage to the housing structure 0.7 4.83 Upper limit for the reversible impact on human

1.0 6.90 Medium damage to the house; metal board distortion; scratch

by glass pieces 2.0 13.8 Partial collapse of walls and roofs 2.4 16.56 The ear drums of those exposed break 2.5 17.25 Lethal threshold for humans 3.0 20.7 Distortion and basic displacement of steel structure buildings 5.0 34.5 Wooden structure breaks 10 69.0 Almost all the buildings collapse; lungs bleed



129

20 138 Direct impact causes 100% death

Here below is a commonly used death radius formula based on the overpressure -impulse rule and the probability model.

37.0TNT

0.5 )1000W6(.13R =

The death rate is taken as 50%. It could be assumed that all the people within the radius are dead and no one beyond the radius is dead. In this way, the problem could be simplified.

The radius of property loss could be calculated according to the following formula.

6/12

TNT

3/1TNT

W31751

6W.4R

⎥⎥⎦

⎤

⎢⎢⎣

⎡⎟⎟⎠

⎞⎜⎜⎝

⎛+

=

Normally, the death radius is calculated based on the overpressure of 90kPa, 44kPa for the calculation of GBH radius, and 17kPa for the calculation of flesh wound radius. The radius of property loss is calculated as13.8kPa

8.5.1.2 Fire The explosion of LPG vapor clouds is accompanied with fire. Boiling Liquid Expanding Vapor Explosion (BLEVE) fire ball heat radiation model is mainly to predict the impacts of heat radiation on the environment during the explosion of vapor clouds.

1) Calculation of fire ball radius

It has been proven by the experiment that the radius of fire ball is proportional to the cube root for the mass of flammable substances. The formula for the calculation of fire ball radius is as follows:

baW=D

In which: D——Diameter of fire ball, m；

W——Mass of flammable substances consumed in the fire ball, kg.For single-tank storage, W is taken as 50% of the tank capacity; For double-tank storage, W is taken as 70% of the tank storage; For multi-tank storage, W is taken as 90% of the tank capacity.

2) Calculation of fire ball duration

It has been proven by the experiment that the duration of fire ball is also proportional to the cube root of the flammable substance mass W, which could be calculated according to the formula below:

dcWt =

In which: t——Duration of fire ball, s；

W——Fuel mass in fire ball, kg.For single-tank storage, W is taken as 50% of the tank



130

capacity; For double-tank storage, W is taken as 70% of the tank storage; For multi-tank storage, W is taken as 90% of the tank capacity.

3) Flux of heat radiation

The surface heat radiation flux of fire ball is calculated according to the formula below:

tDfWHE 2

c

π=

In the formula above, it is actually assumed that the heat radiation within the duration of fire ball is constant.

Hc——Liquid combustion heat;

Assuming f is the combustion radiation fraction, which is the function of the vessel pressure:

2f

1pff =

The constants f1=0.27，f2=0.32; p is the pressure inside the vessel with the unit of MPa. When there is

no reliable data, f could be taken as 0.3.

The heat radiation flux at the distance of x from the ground projection of the fire ball is:

24

)ln058.01(tx

xfWHq C

π−

=

4) Injure model

Description of commonly used probability models for heat radiation injure The relationship between the probability and the injure percentage is:

∫−

∞−=

5Pr 2

)2

exp( duuD

When Pr=5, the injury percentage is 50%.

Death probability:

( )3/4ln56.223.37Pr tq+−=

4/3

56.223.37Prexp1

⎥⎦

⎤⎢⎣

⎡⎟⎠⎞

⎜⎝⎛ +

=t

q (1)

Probability of secondary-degree burn

)ln(0188.314.43Pr 3/4tq+−=

4/3

0188.314.43Prexp1

⎥⎦

⎤⎢⎣

⎡⎟⎠⎞

⎜⎝⎛ +

=t

q

Probability of first-degree burn



131

)ln(0188.383.39Pr 3/4tq+−=

4/3

0188.383.39Prexp1

⎥⎦

⎤⎢⎣

⎡⎟⎠⎞

⎜⎝⎛ +

=t

q

Property loss is normally calculated according to the flux required for timber ignition:

254006730 5/4 += −tq

The damage conditions corresponding to the heat radiation flux are shown in Table 8.5-2.

Table 8.5-2 Damage conditions corresponding to the radiation flux Hazard level Entrance flux (KW/m2) Damages to equipment Hazards to human

Severe damage (A)

37.5 The equipments are totally

damaged 1% death/10 sec.

100% death/1 min.

Severe impact (B)

25.0 Minimal energy for wood to

burn under long-time radiation without flames

Heavy casualty/10 sec. 100% death/1 min.

Medium impact (C)

12.5

Minimal energy for wood to burn and plastics to be

melted with the presence of flames

First degree burn/10 seconds

1% death/1 min.

Light impact (D)

4.0 Pain is felt when it takes

more than 20 seconds

No impact (E) 1.6 Long-term radiation,

absence of discomfort

5) Calculation of heat radiation flux received by the target Besides the above method, the following formula is often used to calculate the heat radiation energy received by the target. When r>R, the heat radiation flux received by the target is calculated with the formula below:

2/3222

0 )/()ln58.01()( rRrrRqrq +−=

In which: q0——Radiation flux of fire ball surface, W/m2.

r——Horizontal distance from the target to the centre of fire ball, m；

R——Radius of fire ball, m；

8.5.1.3 Calculation Results (1) Explosion As shown in Table 8.5-3.



132

Table 8.5-3 Damage possibly caused by the leakage of industrial coke oven gas and H2 explosion accident (unit: m)

Parameters Death radius Heavy injury

radius Light injury

radius Property loss radius

Distance to the leakage spot of the storage tank

12.7 37.2 66.8 27.5

(2) Fire The explosion could lead to fire, whose consequent damage is shown in Table 8.5-4.

Table 8.5-4 Damage possibly caused by the fire after the leakage and explosion

of industrial coke oven gas、

Parameters Value Parameters Value Fireball radius 21.18m Fireball duration 5.13s

Heat radiation flux that leads to death 69292.6W/m2 Death radius 25.3m Heat radiation flux that leads to

second degree burn 45893.3.6W/m2 second degree burn 36.9 m

Heat radiation flux that leads to first degree burn

20165.5.6W/m2 Radius of first degree

burn 62.3 m

Heat radiation flux of property loss 27220.1.6W/m2 Property loss radius 52.3m



133

When gas tanks of industrial coking oven leak for 10min, 1052. 45kg hydrogen of the leakage gases will form vapor clouds, of which the main component H2, (hydrogen) may cause fire and explosion when triggered by fire source.The damages include: 25. 3 m of death radius, 62. 3 m of burn radius (degree ), and properties of the field within about 55 m get damaged.

Therefore, once there is any leakage from the gas tank, the fire and explosion accident could happen when there is any fire source with possible deadly hazards to the people within about 30m.Its injury radius could reach about 80m, which could have impacts on other gas tanks to some extent.

Therefore, the people within 150m should be evacuated except the professional firemen.Water fog should be immediately sprayed over the gas leakage for dilution and absorption.The cooling treatment should be implemented for other surrounding gas tanks.The nearest environmental sensitive point for the project is Shanzibei Village, which will not be directly impacted.

8.5.2 Prediction of CO leakage

8.5.2.1 Forecast model

In this risk assessment，the calculation of poison gas diffusion has been adopted the multi-puff formula recommended in risk Guidelines Under the windy condition:

( )( )

( )⎥⎥⎦

⎤

⎢⎢⎣

⎡ −−= 2

2

2/3 2exp

22,,

x

o

zyx

xxQoyxCσσσσπ

( )⎥⎦

⎤⎢⎣

⎡−

⎥⎥⎦

⎤

⎢⎢⎣

⎡ −− 2

2

2

2

2exp

2exp

z

o

y

o zyyσσ

Where

C ( )oyx .. ——pollutant concentration (mg/m3) in the air at the down wind ground coordinate (x，y). )；

ooo zyx ,, ——Puff center coordinate;Q——the puff discharge amount in the period of accident;

σX σy σz——refer to the diffusion parameter of X, Y, Z direction (m). Often set the value asσX =σy

The risk accident happened under calm wind condition should be adopted multi-puff mode under the changing weather condition:

)2

exp()2

exp(*)2(

),( 2

2

2

2

2/13Zyz

HeVx

QyxCσσ

γσπ

−⋅−⋅⋅⋅

=

Where

V*——dispersion rate at average level, set the value as 0. 7m/s under the calculation.

In case of accident source intensity keeps a long time discharge (several hours or several days), Gauss plume formula can be adopted for calculation:

⎪⎭

⎪⎬⎫

⎪⎩

⎪⎨⎧

⎥⎦

⎤⎢⎣

⎡ +Δ+−+⎥

⎦

⎤⎢⎣

⎡ −Δ+−−= 2

2

2

2

2

2

2)(

exp2

)(exp)

2exp(

2 z

rs

z

rs

y

r

zy

zhzzhzyu

QCσσσσσπ

Where

C——the concentration generated at receiving station r (xr,yr,zr) from point source S(0,0,Zs).

Short-term diffusion factor (C/Q) can be expressed as:



134

)2

)(exp

2)(

exp)2

exp(2

1)/( 2

2

2

2

2

2

⎪⎭

⎪⎬⎫

⎪⎩

⎪⎨⎧

⎥⎦

⎤⎢⎣

⎡ +Δ+−+⎥

⎦

⎤⎢⎣

⎡ −Δ+−−=

z

rs

z

rs

y

r

zy

zhzzhzyu

QCσσσσσπ

Where

Q——pollutant release rate; hΔ

——Smoke plume rising height; yσ zσ

——Diffusion parameters of both horizontal direction and Vertical direction at down wind distance,Diffusion parameter can be calculated according to the following formula:

)()( 1,,, −−= kkjkkjkj τστσσ

8.5.2.2 Analysis for Calculated Result of Toxic Gas Diffusion (1) Assessment Standards

In view of the limitations of research data on current toxicology，the chronic damage result in present, such as acute death, and wounds, disability, teratogenesis and Carcinogenesis caused by non-acute death is still not count in the Risk value calculation, and according to the PC—STEL specified in Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2), the safety evacuation distance should be given.

For the related standard of toxic material covered in this assessment, please see table 8. 5-5.

Table 8. 5-5 The regulation on related criterion for leakage The name of hazardous substance

Source Harmful degree for human body Concentration (mg/m3)

LC50 The rat will be die if it inhales after 4h 2069

STEL (the maximum permissible concentration of harmful substances for workshop air)

30

GBZ2-2002(TJ36-79) Maximum permissible concentration of harmful substances for residential area atmosphere

3. 00mg/m3(one-time value) 1. 00mg/m3(day average)

CO

GB3092-1996 Implementing standard for class-2 region

Daily mean value 4 Hourly mean value 10

(2) Calculation results



135

Table 8. 5-6 Predicting results of concentration increase for the ground axis along leeward direction with CO leakage accident (mg/m3)

Windy (1. 7m/s) Light wind (0. 8m/s) B stability D stability E stability B stability D stability E stability 0 0 0 0 13. 0371 0. 6558 0. 1685 100 0 0 0 18. 7867 1. 157 0. 4211 200 0 0 0 23. 1685 2. 0472 1. 1118 300 0 0 0 24. 5427 3. 4989 2. 7964 400 0 0 0 23. 3316 5. 6003 6. 1665 500 0. 0086 0 0 20. 8243 8. 2578 11. 535 600 0. 2211 0 0 18. 0078 11. 1962 27. 8279 700 1. 3316 0 0 15. 3717 14. 0651 34. 1686 800 3. 8491 0 0 13. 0862 16. 5657 40. 7643 900 7. 4009 0 0 11. 1705 18. 5202 44. 6309 1000 11. 1744 0. 0003 0 9. 5863 19. 8741 35. 5568 1200 17. 2504 0. 0106 0. 0022 7. 202 23. 9677 28. 2596 1500 20. 7897 0. 1919 0. 0665 4. 931 19. 956 23. 5543 1600 21. 8750 0. 3607 0. 1427 4. 399 19. 2519 20. 4591 2000 18. 8015 1. 8646 1. 108 2. 9292 15. 9532 17. 5631 2500 14. 8941 4. 6467 2. 9838 1. 9239 12. 1971 12. 6986 3000 11. 6022 7. 427 5. 3591 1. 3552 9. 3714 10. 0252 4000 7. 4622 10. 9286 9. 8575 0. 7733 5. 8486 8. 5126 5000 5. 4538 12. 0914 12. 8991 0. 4982 3. 9322 7. 1372 5500 4. 871 12. 2012 13. 862 0. 4126 3. 3001 6. 0635 6000 4. 4413 12. 1439 14. 5227 0. 3472 2. 8057 5. 2109 6500 4. 1085 11. 9827 14. 9385 0. 2962 2. 4127 4. 5238 7000 3. 838 11. 7571 15. 1606 0. 2557 2. 0955 3. 9625 7500 3. 6096 11. 4917 15. 2324 0. 2229 1. 8362 2. 2655 10000 2. 8116 9. 9699 14. 3496 0. 1257 1. 0511 1. 0187 15000 1. 9792 7. 3891 11. 184 0. 0559 0. 4731 0. 5754 20000 1. 5288 5. 7532 8. 8999 0. 0315 0. 2673 0. 3265 21000 1. 0456 2. 3421 5. 6772 0. 0018 0. 047 0. 0536 24000 0. 5643 1. 0567 2. 1234 0. 0006 0. 016 0. 0253 Maximum ground-level concentration

21. 8750 12. 2012 15. 2324 24. 5427 23. 9677 44. 6309

Distance to the source (m)

1600 5500 7500 300 1200 900

Assessment Standards STEL 30mg/Nm3



136

Table 8.5-7 Range for the appearance of various standard concentrations with CO leakage accident

Meteorological condition

Consequences analysis CO

Maximum ground concentration distance (mg/m3) 47. 6721/600 Range of semi-lethal concentrations (m) 0 Exceeds the range of the highest concentrations allowed in the workshop (m) 1000

Exceeds the range of the standard of second level air quality (m) 2700

F stability u=0. 5m/s

Exceeds the range of the highest concentrations allowed in the residential area (m) 6000

Maximum ground concentration and distance (mg/m) 13. 2755/8000 Range of semi-lethal concentrations (m) 0 Exceeds the range of the highest concentrations allowed in the workshop (m) 0


F stability u=1. 5m/s


Maximum ground concentration and distance (mg/m) 12. 2012/5500 Range of semi-lethal concentrations (m) 0 Exceeds the range of the highest concentrations allowed in the workshop (m) 0


D stability u=1. 7m/s


Concentration value for various sensitive spot, please see table 8. 5-8To predict the worst impacts of the accident on the surrounding environmentally sensitive points, the maximum concentration is forecasted by taking the concentrations of different sensitive points under the above mentioned different meteorologic conditions.



137

Table 8.5-8 The concentration values of all the sensitive points when CO and H2S accidents occur (10min, category D, 1. 7m/s)

CO Time of emergence (min)

Concentration increment (mg/m3) Ratio to the standard value The climate conditions at the time of emergence

1 Old Xiaojiang Village 20. 9827 6. 99 E，1. 7m/s 9. 49

2 New Xiaojiang Village 19. 2345 6. 41 D，1. 7m/s 13. 17

3 Daping Village 21. 3721 7. 12 D，0. 8m/s 12. 56

4 Liantang Village 27. 8279 9. 27 D，0. 8m/s 8. 25

5 Yumin Village 18. 8015 6. 27 D，1. 7m/s 15. 63

6 Shuibei Village 9. 0227 3. 01 D，1. 7m/s 16. 25

7 Maba No.3 Primary School 11. 6022 3. 87 D，1. 7m/s 16. 25

8 Da Yuantou 10. 1275 3. 38 D，1. 7m/s 14. 41

9 Shaogang No.1 Middle School 13. 5960 4. 53 D，1. 7m/s 15. 02

10 Meihuazhai Village 8.2943 2. 75 E，0. 8m/s 19. 33

11 XinZhai 14. 7112 4. 90 E，0. 8m/s 26. 09

12 Maba Town 14. 5231 4. 84 E，0. 8m/s 38. 39

13 Nanhua Temple 14. 3496 4. 78 E，0. 8m/s 44. 54

14 Shanzibei 23. 3316 7. 78 E，1. 7m/s 8. 87 Standard TJ36-79, one-time value in the residential area: 3. 0



138

*Note: To predict the impacts of the CO content from the leakage of blast-furnace gas on the surrounding environmentally sensitive points under different meteorologic conditions, 1. 7m/s (B, D, E) and 0. 8m/s (B, D, E), the maximum predicted values under different meteorologic conditions are taken as the concentrations for various sensitive points.When there is CO leakage, under the worst and credible meteorologic conditions, in such accident there is no scope with the appearance of median lethal concentration; under the credible meteorologic condition (stability D and the wind speed of 1. 7m/s), the scope incompliant with the Class II air quality standard is 10000m, and the scope beyond the maximum permitted concentration for residential area is 21000m.

(1) With the assumed accident source, the CO leakage from the blast-furnace gas tank is simulated, whose rate is 9. 14kg/s.Table 8. 6-6 lists the leeward axial concentrations of CO under different stability and different wind speed.

At a light wind day and under the Class B stability, the maximum of one-hour axis concentration increment for CO ground axis can achieve to 21. 8750mg/m3, which arises at 300m of down wind and below the 30 mg/m3 of CO STEL standard specified in Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002), it will harm the human body and will not cause injuries and deaths within this scope.

At a light wind day and under the Class B stability, the maximum of one-hour axis concentration increment for CO ground axis can achieve to 44. 6309mg/m3, which arises at 900m of down wind and below the 30 mg/m3 of CO STEL standard specified in Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002), it will harm the human body and will not cause injuries and deaths within this scope.

(2) The scope for the appearance of various standard concentrations with CO leakage accident is shown in Table 8. 6-7:

When there is CO leakage, under the worst and credible meteorologic conditions, in such accident there is no scope with the appearance of median lethal concentration; under the credible meteorologic condition (stability D and the wind speed of 1. 7m/s), the scope incompliant with the Class II air quality standard is 10000m, and the scope beyond the maximum permitted concentration for residential area is 21000m.

Under the credible meteorologic condition (stability F and the wind speed of 0. 5m/s), the scope incompliant with the Class II air quality standard is 2700m, and the scope beyond the maximum permitted concentration for residential area is 6000m.The concentration at 600m of the leeward axes is 47. 6721 mg/m3, which is slightly higher than the short-time exposure permission for CO concentration regulated in Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002), but lower than the acute toxicity of CO, 2069mg/m3 with the duration about 15-20min, which means it will not result in any personnel injury.

(3) The increase of CO leakage accident at various sensitive points is shown in Table 8. 6-8:

It is shown in Table 8. 6-8 that the CO has relative great impacts on the concentration increase of various sensitive points, which all exceeds the CO concentration of 3. 00mg/m3 (primary value) as regulated in “Maximum allowable concentrations of hazardous substances in the air for residential areas” (TJ36-79).However, they are all lower than the requirements of “Occupational Exposure Limit for Hazardous Agents in the Workplace” (GBZ2-2002).Therefore, it will not result in any personnel injury accident at the sensitive points.In 50min after the accident occurrence, there will be no more concentration increase at various sensitive points.



139

To sum up, when there is any CO leakage accident, the worst meteorologic conditions will have certain impacts on the health of people within 1000m.The concentration might be higher than the limit value regulated in Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002) but without any consequent injury.And the duration is relatively short, which will normally dissipate within 15~20min. Therefore, the drill should be well carried out at peacetime.The prevention drill should be actively organized for the residents at the environmentally sensitive points within around 1000m such as Liantang Village, Shanzibei and Laozijiang.Once there is any leakage accident, to protect the public health, the residents at the three points shall be immediately evacuated.

Based on gas leakage accident results and preventive measures accumulated for each year in the past, the assessment considers the environmental risk of this project is in the acceptable scope.

8.5.3 Collection of fire water discharge/sprinkling water

Once there is any gas leakage for the gas tanks, the site should be immediately sprinkled with fire water to dilute and dissolve the gas concentration in order to prevent its diffusion.

The major areas where fire is possible to take place in the tank area are various gas tanks where the gas leakage will lead to fire when there is any fire source. According to the accident statistics of SGIS from 1991 to 2006, there are no fire accidents.However, the media stored in the tank area include the flammable and explosive blast-furnace gas, coke oven gas and converter gas.Therefore, high caution should still be paid to the fire and explosion accidents.

Under the fire accident, CO fire belongs to gas fire. In the event of such fire, the gas supply should be cut off immediately; if it fails to be cut off, the flaming gas should be forbidden. The extinguishing agent commonly used in fog attack, foam, Carbon Dioxide and dry powder.

The firewater of CO fire accident often contains suspended matter and other impurities.It is different from the accident firewater of chemical industry, because there is no toxic and harmful substance flow out from the firewater.If there is a fire accident for this project, the firewater should be collected through rainwater pipeline, and then a sample sedimentation process should be conducted before discharging.

At the initial stages of construction, SGIS’s rainwater sedimentation tank and as an accident tank used for pollution discharge and firewater collection can be ensure reaching the standard of general discharge openings.

For fire water discharge instruction for accident in this project, see table 8. 5-1

Figure 8. 5-1 Accidental pollutant discharge system of the project

8. 5. 4 Calculation for Risk Value

The forecast result of this CO H2S leakage accident indicates that the present concentration of various sensitive spots all lower than the workshop maximum permissible concentration, and there is no half

Through rainwater line

regulation pool of the wastewater plant to be built

Reusing in the production steps, or discharging when reaching the discharging standards

Fire water supply for Equipemtnts area

Rainwater Collecting Pond of the Company

Formatted: Font: 10 pt







140

lethal concentration and it will not cause injuries and deaths. The calculation formula for environmental risk value caused by maximum credible accident is as following:

R= Probability of a accident × Probability of negative weather × Probability of injury

After the determination of the damage degree and death number within the scope of half lethal concentration, there is no such case occurs, so the assessment result indicates the risk value is in the acceptable scope.

8.6 Risk Prevention Measures

8.6.1 Engineering Measures The new dry gas tanks (POC) are selected for the blast-furnace gas tanks, industrial coke oven gas tanks and civil coke oven gas tanks in the gas tank area.The piston system of the tank type is equipped with special thin oil airproof devices and guide device, which could ensure the up and down smooth operation of the piston without any leakage of the gas stored in the tanks. The site is installed with lift cage and lift respectively inside and outside for the convenience of inspection and maintenance to ensure the safe operation. Wiggins gas tanks are not only equipped with various safety maintenance measures for dry gas tanks, but also added with interlock control system so that the gas flow direction could be immediately adjusted and controlled under emergency; The mixed gas pressurization stations, coke oven gas pressurization stations, converter gas pressurization stations and oil pumping stations are all technically designed to ensure the safe operation of various facilities in the tank area, see Table 8. 6-1 for details.

Table 8.6-1 Setting of Safety Measures for Various Gas Tanks Tank type Measures Function

Emergency dispersing

pipe

The superfluous gas is automatically released when accidents occur, to prevent the piston from rapidly hitting the top and safeguard the gas tank.

Replacement dispersing

pipe

In times of commission or repair, the air or gas in the gas tank should be replaced with nitrogen, and be released through the dispersing pipe.

Safe dispersing

pipe

When the combustion dispersing tower in the pipe network fails, the superfluous gas in the general gas pipe can be automatically released when the piston reaches the maximum stroke, to safeguard the gas tank.

Ventilated building

For the ventilation and air exchange at the upper part of the piston in the gas tank

New dry type gas tank

(POC)

Leakage inspection measures

CO monitoring point is set at the upper part of the piston, where the content of CO measured by CO automatic analyzer can provide timely information on the sealing conditions of piston. Personnel are allowed to work on piston for long time when the CO concentration is lower than 30mg/m3 at the upper part of the piston; personnel are allowed to work on piston for half an hour under reliable supervision when the CO concentration is within the range of 30-100mg/m3; personnel are usually not allowed to work inside the piston when the CO concentration is within 100-200mg/m3; gas should be stopped for examination and repair when the CO concentration reaches 300mg/m3.



141

Monitoring of the oil

level in oil ditch of the

piston

There’s an oil level monitoring equipment in the oil ditch of the piston, from which the measured piston oil level will be transmitted to the control room for instruction, equipped with alarm for upper and lower limit, readily monitoring the safety property of the sealing of piston.Additionally, the gradient of the piston during running can be generally acquired through measured parameters of oil level.

Detection of liquid level

in the bottom oil

ditch

Liquid level display is used for the on site detection of oil level in the bottom oil ditch. And radar detection device of oil level and liquid level is additionally equipped (with remote access).

Fire extinguisher

Equip MF/ABC5 type portable dry powder fire extinguisher around the body of gasholder.

Nitrogen pipeline

Starting from the main nitrogen pipe in the gasholder area to the gasholder after shutting down the valve. The nitrogen is used for the displacement in the gas tank, the oil pump station, the fire extinguishing and gas safety release pipes.

Replacement bleeding pipe, safe discharge pipe, nitrogen pipe/leak monitoring are all in conformity with POC.

Wilkins tank Interlock

control

When the piston of converter gasholder is at high position, the sound and light alarm will be activated in the control room. When the piston reaches the highest position, the tee bleeding valve inside the converter gas recovery system will open (located in the control room of the primary dusting fan of converter gas), cutting the valve to the pipeline of the gasholder; the sound and light alarm will be activated when the piston is at a low position, and when it reaches the lowest position, the gas pressuring machine will stop running and can not be started.

Coke Oven Gas Pressurization station

Inside the station there is a 10t electric explosion-proof crane with designed interlock control system which will cut the gas automatically upon the occurrence of leak accident, preventing gas leakage.

Pressurization station of mixed gas

It is designed with interlock control system which will cut the gas automatically upon the occurrence of leak accident, preventing gas leakage.

Pressurization station of converter gas

Inside the station there is a 10t electric explosion-proof crane, designed with interlock control system. The insulator compartment shall be sealed by nitrogen to prevent the gas leakage, and equipped with the electric heater to prevent the insulator from being damaged by the condensed vapor.The shell shall be provided with the auto-reset explosion valve to release the pressure timely in case of gas explosion accident; the rectifier shall be adjustable and can automatically reduce the voltage to the safe level in case the oxygen content of converter gas exceeds the rated value.

Electric precipitation for converter gas

It is designed with interlock control system which will activate sound and light alarm when the oxygen content of the gas in the outlet pipe of the gasholder exceeds 0. 5%, and when it exceeds 1%, stop the operation of electric precipitator and cut the inlet valve.

Standby design for all equipment

Standby equipment, parts or systems are equipped for all important equipment in the technique design; 2 supply circuits are set for the central distribution substation of this project, each of which can bear the 100% load of the whole plant. At the mean time, standby equipment is set for all pressuring station’s fans, oil pump station’s oil pumps and other equipment.

8.6.2 Fire-fighting measures (1) Building fire-fighting design

See Table 8. 6-2 for the structure type, fire severity category, fire-endurance level and building area etc.in the buildings in the tank area.



142

Table 8.6-2 Summary of building fire-fighting design Fire-fighting measures

No.: Construction Name Building Area (m2)

Structure Form

Type of fire risk

Fire resistance level

Auto alarm

Fire-fighting water

Chemical fire fighting Other

1 Mixed gas and converter gas pressuring station and electrical chamber

2836. 8 Reinforced concrete Class B √ √

Manual High pressure switch room 1 with automatic

2 Coke oven gas pressuring station and electrical room 1750 Reinforced

concrete Class A √ √ Manual

3 Spare parts room 270 Reinforced concrete Class D √ Manual

4 Elevator machine room 27. 72×3 Masonry Class D Manual 5 Guard room 9×2 Masonry Class E Manual



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(2) Fire and explosion protection Explosion proof electrical equipment and instruments are used in places vulnerable to explosion. The piston in the gas tank is explosion proof section I, and the scope within a 3m radius of the tank body, and 4. 5m radium of the tank head, the proximity of the oil pump station, and the external elevator room are all explosion proof section II, which are all designed according to the explosion proof level. In order to prevent the generation of an explosive atmosphere in the exhaust stack, the design considers consecutively inflating the exhaust stack with nitrogen.When the piston arises to 95% of its stroke, cut off the valve that controls the inlet and outlet of gases, so as to prevent accidents caused when the piston hits the top.The valve of the exhaust stack can be opened automatically/manually to exhaust.Manually control the degree of openness of the valve to adjust the amount of exhaustion, to reduce the amount of gas exhaustion.This operation is controlled in the operation room; when the piston arises to more than 100% of its stroke, the emergency exhaust stack set on the upper part of the side wall of the gas tank will automatically exhaust the gas to safeguard the gas tank. Light walls are used as explosion proof and pressure release measures in the main plants where the pressurization stations for coke oven gas, blast furnace gas, mixed gas and converter gas are located, and floors that do not produce sparks are used. (3) Fire-fighting vehicle passage Circular roads 4 meters in width are designed in the gas tank section, and two exits are set to connect the external roads, as passages for fire-fighting vehicles and equipment repair vehicles.The headroom of the roads should be greater than 4 meters. (4) Fire automatic alarm and interlink control The project sets a fire automatic alarm and interlink control system in the pressurization stations of coke oven gas, mixed gas and converter gas and the diesel engine room in the gas tank section according to the prescriptions of the Design Specifications for Fire Automatic Alarm System (GB50116－98), the Fire

Preventing Specifications for Steel and Metallurgic Enterprises (GB 50414－2007) and the Design of Fire

Automatic Alarm System for Metallurgic Enterprises (YB/T4125－2005).This system consists of the fire alarm and interlink controller, photoelectric smoke detector, fixed-temperature cable detector, manual alarm and acousto-optic alarm etc. The fire alarm and interlink controller is set in the operating room of the pressurization station of mixed gas and converter gas.All kinds of fire alarm detectors, manual alarms, acousto-optic alarms are respectively set in the high and low-voltage distribution rooms, transformer rooms and operating rooms. (6) Fire-fighting water According to the relevant prescription of the Fire Preventing Specifications in Building Design (GB 50016－2006), the fire-fighting measures are designed under the supposition that only one fire occurs at one time in the tank area.The amount of fire-fighting water can be calculated as the capacity of the biggest combustible gas tank.Outdoors, hydrants are set along the roads.The distance between every two hydrants should be no more than 120 meters, and the rate of water use is 35L/s; indoor hydrants are set in the pressurization stations and electrical rooms of mixed gas, converter gas and coke oven gas, and the rate of water use is 5L/s.The fire-fighting water is supplied by external pipe network. (7) Others Fully-overwhelming carbon dioxide automatic fire-extinguishing devices are set in the high-voltage power distribution room No. 1 of the mixed pressurization station. Nitrogen guards are set in the oil pump station.204 carbon dioxide fire extinguishers are set according to the Specifications for the Configuration and Design of Fire Extinguishers in Buildings. Accident oil collecting pits are set for the oil-immersed transformer. Level 2 load power supply is used for the fire-fighting electrical equipment of this project. (8) Fire-fighting management



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1) Safety signs The “NO OPEN FLAMES” signs are set at obvious places in plant area, and the fire-fighting signs like “DANGER OF FIRE, DANGER OF EXPLOSION” are set in some fields with the danger of explosion. The detailed setup is done according to GB15630-95 Requirements for The Placement of Fire Safety Signs. 2) Fire-fighting mechanism The project is located inside the plant area of SGIS, the fire-fighting work is considered uniformly by SGIS and no additional fire-fighting team is set. But the person responsible for fire-fighting concerning supervision and management thereof is included in the design.

8.6.3 Main safety measures (1) Measures of preventing natural disasters The gas tank and external elevator silos are steel structure buildings, and need to be grounded in caser of lightning.The grounding resistance ≤1Ω.The grounding resistances of all the gas pipes in and out of the tank area are all required to be less than 10Ω.See Table 8. 6-3.Rain sewage system is set outdoors in this project, and the elevation of indoor floors should be greater than that of outdoor fields, to prevent the damages by thunderstorms.According to the Building Anti-Earthquake Design Specifications (GB 50011－2001), the anti-earthquake intensity is set as 6 in the design of this project.

Table 8.6-3 Anti-lightning grounding design in the tank area Design standard Measures

Lightning protection

Gasholder belongs to the first type of lightning protection industrial structurePressuring station belongs to the second type of lightning protection industrial structure; gas control building belongs to the third type of lightning protection structure.

Use iron rod and round steel to make lightning protection grid at the head of the gasholder, set lightning conductor on the gas bleeding pipe above the gasholder head the down lead of which can utilize the body of gasholder; set lightning protection belt on the roof of pressuring station and use round steel or the steel bar of the structure as for down lead. All lightning protection facilities should be reliably grounded.

Lightning protection grounding Lightning protection grounding should be available at the gasholder, pressuring station and other structures.

Anti-static grounding The gas pipeline should be connected across at several parts, along with reliable grounding.

System grounding Rectifier transformer and the neutral point on the low voltage side of power transformer should be reliably grounded.

Grounding

Protective grounding of the equipment The metal casing uncharged in normal conditions of all electrical equipment should be reliably grounded.

(2) Personnel safeguard measures Leakage protection is set for all the socket loops and loops of mobile electrical equipment, to prevent electric shock accidents.And 12V repair lighting power is set. Measures to prevent mechanical damages and personnel fall As required by the specification, operating channels and repair channels are set in the monitoring rooms and power distribution rooms.Operating platforms, walking boards, safety guardrails and handrails on which people can conveniently walk are set in all the production buildings.The height and intensity of the guardrails comply with the specifications of state labor protection; eaves and protective guardrails are set on the roof, with the heights and intensities compliant with relevant specifications.Protective guardrails are set for height ascending facilities (1050mm in height); the height and headroom of the buildings, in addition to the technical requirements, should also comply with the safe headroom requirements for



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hoisting machines and factory buildings.Dual-surface safe walking platforms are set for all the hoisting machines above medium work requirements, and interconnected at the gable wall. Measures to prevent explosion and poisoning The piston in the gas tank is explosion proof section I, and the scope within a 3m radius of the tank body, and 4. 5m radium of the tank head, the proximity of the oil pump station, and the external elevator room are all explosion proof section II, which are all designed according to the explosion proof level.Explosion proof types are used for all electrical equipment and instruments. In order to prevent the generation of an explosive atmosphere in the exhaust stack, the design considers consecutively inflating the exhaust stack with nitrogen.When the piston arises to 95% of its stroke, cut off the valve that controls the inlet and outlet of gases, so as to prevent accidents caused when the piston hits the top.The valve of the exhaust stack can be opened automatically/manually to exhaust.Manually control the degree of openness of the valve to adjust the amount of exhaustion, to reduce the amount of gas exhaustion.This operation is controlled in the operation room; when the piston arises to more than 100% of its stroke, the emergency exhaust stack set on the upper part of the side wall of the gas tank will automatically exhaust the gas to safeguard the gas tank. Light walls are used as explosion proof and pressure release measures in the main plants where the pressurization stations for coke oven gas, blast furnace gas, mixed gas and converter gas are located. CO automatic detection and alarm devices are set in the pressurization rooms, on the gas tank pistons and in the oil pump rooms. Respirators and portable combustible gas detection and alarm instruments are set. Temperature and gas protections are set for the oil-immersed transformers. Accident lightings are set in electrical and control rooms.Evacuation lightings are set for evacuation exits and passages. (3) Others Aviation obstruction beacons are set for the gas tank. PLC control is adopted for the production operation of the main equipment, and parameters that affect safe production are automatically detected, alarmed and interlinked. Select low-noise or noise-free products that comply national standards for the electrical equipment, and place them in the tank or special rooms. In order to eliminate the residual heat by the indoor equipment, improve operating conditions, and ensure the normal operation of equipment and apparatus, a total of 63 blowers and air-conditioners are set in all the rooms.

8.6.4 Environmental Monitoring & Environmental Risk Emergency Monitoring

8.6.4.1 Routine Monitoring The monitoring of the project is the responsibility of SGIS. SGIS is provided with a specialized environmental monitoring station, which is responsible for monitoring pollution source and environmen. (1) Water-quality monitoring: the items of regular water-quality monitoring are suggested as: wastewater amount, pH, CODC, BOD5, SS, NH3-N, petroleum and animal and plant oils etc.Monitoring sites should include main wastewater discharge outlet of plants, inlets and outlets of the sewage treatment facilities, general discharge outlet of the plants. Monitoring frequency can be determined on different monitoring projects, at least once a week.Additional measuring should be taken in case of abnormal production or accidental drainages. However, on-line monitoring of the wastewater flow and CODCr concentration should be implemented on the general drainage outlet.If there are temporary difficulties with on-line monitoring of CODCr concentration, the item of CODCr monitoring should be carried out every day. (2) Noise monitoring Monitoring items: Noise level



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Monitoring points: Noise Within Factory Monitoring frequency: Once a quarter, day and night monitoring shall be carried out in the absence of rain with wind velocity less than 5.5 m/s. Planning requirements on discharge outlets According to the State Standard "Graphical Signs For Environmental Protection Discharge Outlet (Source)" and the technical requirements of the State Environmental Protection Administration, "Requirements on Standardized Discharge Outlet Rectification (Trial Implementation)," all discharge outlets (including water, gas, sound, dregs) of the plants must be in accordance with principles and standardized requirements featuring "being easy in sampling, convenient to measure and monitor, and facilitated to routine on-site supervision”.Corresponding environmental protection graphic signs shall be set, and discharge outlet distribution map shall be drawn.Meanwhile flowmeters shall be installed on the sewage discharge outlets and operation monitoring devices shall be set in treatment facilities.The standardization of discharge outlets should comply with the relevant requirements of Environmental Supervision Office of Shunde District.

8.6.4.2 Emergency Monitoring SGIS implements a duty system for environmental risk accidents.Emergency duty room is set up in the company monitoring station with person on duty 24 hours a day. Emergency monitoring facilities and personnel shall be allocated to be ready to receive pollution accident information from the general dispatch room of the company, all department rooms, plants and the society, and take timely emergency monitoring program, assign monitoring staff and analysis staff, and coordinate with the Environment Department on the investigation and disposal of environmental pollution source. In case of emergent pollution accidents, the monitoring station staff shall arrive on the spot with necessary monitoring facilities for monitoring air and water quality upon being informed, and according to the arrangements of the company's Environment Department, carry out atmospheric and related water monitoring, and track a certain range in the back-wind direction or backward position for samplings. By accident types, emergency monitoring in high frequency (at least once an hour) shall be implemented on relevant sites, and monitoring items shall be chosen according to the situation, and the situation shall be monitored at any time to provide basis for emergency command. The monitoring items that the company can not complete in-house should be commissioned to local environment monitoring stations.In case of leakage of toxic or hazardous chemicals, reports shall be immediately sent to local environmental protection authority, and environmental monitoring station of the district shall be commissioned to undertake pollution impact monitoring, possible pollutants emitted shall be reported in advance, and the monitoring station shall be assisted to make emergency monitoring plan suitable to the company’s dangerous accident environment.

8.7 Emergency Scheme

Project risk accidents may influence the surroundings to some degree.With a high level of safety measures, the accident probability will be lower, but not be zero. Once the accident occurs, emergency measures should be taken to control and reduce accident hazards. Since larger accidents may be dangerous to the environment, there are needs for community help, and therefore, an emergency scheme needs to be made in advance.

Emergency scheme is an anticipated scheme for relief activities, which is based on the premise of prevention, aiming at possible accidents of the construction project, to control the hazard source timely, rescue the victims, guide residents for anti-expansion and evacuation, and eliminate hazard consequences. It needs the integration of unit effort and social rescue.

Emergency scheme for gas leakage in the project is divided into two levels, the company-level and social interaction level.

Emergency scheme for the project goes as follows:

Risk emergent handling plan for the gas tank



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I Emergent measures for major accidents of the main body of the gas tank

Reporting procedures:

1 When major accidents such as leakage and fires occur to the main body of the gas tank, those who first find the accident should immediately notify the watch room before the furnace, and the leader of the watcher team should immediately report to the maneuver and section leaders and relevant departments and offices.

2 On receiving the accident report, the dispatcher should immediately notify the staff in the possibly affected areas to evacuate.Meanwhile, he should report to the chief dispatcher, plant leaders and relevant sections for rescue and relief, and ask for rescue by 110, 120 or 119 if necessary.

Organization structures and responsibilities

Emergency leading group

Head: director

Deputy head: vice director in charge of production, vice director in charge of equipment

Members: leaders of production management, technical equipment management, safety management, comprehensive management and different sections.

Major responsibilities of emergency leading group

1 Implement the regulations and rules of the state and the company on emergency rescue and handling in relevant accidents;

2 Led by the emergency command organization of the company, and request emergency assistance;

3 Study major emergency decisions and deployments;

4 Supervise the formulation and revision of the emergency scheme, and declare its implementation and termination;

5 Declare state of emergency and issue instructions; relieve the state of emergency;

Settings of the command center:

Dispatching center is the command center of accident handling, and the director dispatcher on duty is the commander, who commands the accident handling comprehensively.

Major responsibilities of the director dispatcher on duty in emergency handling:

1 Get the basic situation of the accident, and correctly judge the nature of the accident and scope affected;

2 Timely report to the emergency leading group on the basic situation of the accident, correctly issue orders according to the group’s instructions, command accident handling, and control the affected scope, to effectively prevent further expansion of the accident.

3 Request rescue assistance (such as fire rescue, medical rescue, etc. ) if necessary;

Emergency measures:

1 In the case of more severe accidents than leakage and fires, the highest leader on duty (onsite) should organize personnel to quickly evacuate from the hazardous zone (choose a safe evacuation route), notify the personnel in areas that may be affected by the accident to evacuate, and take any actions necessary to prevent the accident from expanding.

2 Under the premise of ensuring safety, it’s required to peremptorily shut off wind, water, power, and various gases (for example, if the gas pipeline has been on fire, it’s prohibited to close gas valves until professionals arrive for handling).

3 After the withdrawal, it’s required to count the head, lay alerting line, and prohibit entry of those unrelated to the accident rescue.



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4 The rescue personnel should be fully aware of the on-site situations before entering the site for rescue.

5 All the staff entering the site should be registered properly, with necessary protective gear, portable monitors (mainly for gas monitoring).Pay attention to the damage of the industry construction (collapse, falling objects) and the risk of explosion.

6 The on-the-spot highest leader is in charge of the spot organization of the emergency handling.

II Emergency measures in serious gas accidents

Reporting procedures

1 When serious gas leakage happens, the first witness should immediately notify the dispatcher and staff of relevant sections.

2 On receiving the serious gas accident report, the dispatcher should immediately notify the staff in the possibly affected posts (including outer-plant), and notify the chief dispatcher, plant leaders and leaders of relevant departments and sections.

3 It’s required to request the Power Plant for dispatching professionals and seek rescue assistance by dialing 110, 120 or 119 if necessary.

Organization structures and responsibilities

Emergency leading group

Head: director

Deputy head: vice director in charge of production, vice director in charge of equipment

Members: leaders of production management, technical equipment management, safety management, comprehensive management and different sections.

Major responsibilities of emergency leading group

1 Implement the regulations and rules of the state and the company on emergency rescue and handling in relevant accidents;

2 Led by the emergency command organization of the company, and request emergency assistance;

3 Study major emergency decisions and deployments;

4 Supervise the formulation and revision of the emergency scheme, and declare its implementation and termination;

5 Declare state of emergency and issue instructions; relieve the state of emergency;

Settings of the command center:

Dispatcher center is the command center of the accident handling, the director dispatcher on duty is the commander, who commands the accident handling comprehensively.

Major responsibilities of the director dispatcher on duty in emergency handling:

1 Get the basic situation of the accident, and correctly judge the nature of the accident and scope affected;

2 Timely report to the emergency leading group on the basic situation of the accident, correctly issue orders according to the group’s instructions, command accident handling, and control the affected scope, to effectively prevent further expansion of the accident.

3 Request rescue assistance (such as fire rescue, medical rescue, etc. ) if necessary;

Emergency measures:



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1 When serious gas accident happens, the on-spot highest leader should organize the staff to evacuate from the dangerous area immediately (Be advised to choose the safe evacuation route), notice the wind direction, and withdraw to the safety zone on windward side.

2 Under the premise of ensuring safety, it’s required to shut off the gas source or request the Power Plant to switch off (shut off) the upper-level gas source. If the gas pipeline has been on fire, it’s prohibited to close gas valves until professionals arrive for handling.

3 After the withdrawal, it’s required to count the head, lay alerting line, and prohibit entry of those unrelated to the accident rescue.

4 The rescue personnel should know clearly the on-site situations before entering the site for rescue, with necessary protective gear, portable monitors (mainly for gas monitoring).They should pay attention to the damage of the industry construction (collapse, falling objects) and the risk of gas poisoning or explosion. 。

5 All the staff entering the site should be registered properly, wear necessary protective gear and obey commands.

6 The on-the-spot highest leader is in charge of the spot organization of the emergency handling.

If the scheme is not consistent with relevant regulations or spirits of the higher authorities, the latter should prevail.

Safe Management Office is responsible for interpretation of the scheme.

8. 8 “Three simultaneous” check table for environment safety The above environmental risks preventing measures are listed as items in the “three simultaneous” check.See Table 8. 8-1.

Table 8. 8-1 “Three simultaneous” check table for environment safety Category Name of the measure Content of the measure Completion

time Monitoring alarm Establish automatic monitoring alarm and

control measures. Monitoring team Establish emergency monitoring team (in

cooperation with the local monitoring station)

Environmental safety

protection system

Monitoring facilities Equip emergency monitoring facilities

Drencher system Drencher system will spray upon an accident occurred.

Atmospheric environment

safety Poison dispel spraying system

Poison dispel spraying system dispels poisonous substances.

Backwater system Flow monitoring pool, backflow pipe and backflow valve of wastewater discharge system.

Changeover valve under clear water

Changeover valve is set for the collection system of clear water.

Rain water changeover valve

Changeover valve is set for the collection system of clear water.

Water environmental

safety

Changeover valve of water for accidents and firefighting

Changeover valve is set for the collection system of water for accidents and firefighting.

Establish these

measures at the same time as production

device.



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9 Cleaner Production and Mass Loading Control

9.1 Cleaner production Analysis

9.1.1 Implication of Cleaner production

Concept of leaner production includes three aspects:

(1) Save raw materials and resources, eliminate poisonous raw materials and reduce the volume and toxicity of all wastes during production.

(2) As for products, it is required to decrease adverse effect during whole life circle from extraction of raw materials to final disposal of products.

(3) As for services, it is required to involve the environmental factors into design and services offered.

Law of the People's Republic of China on Cleaner Production Promotion came into force on January 1st, 2003, so as to increase the level of cleaner production for China.

Selection of cleaner production indexes: Cleaner production analysis is performed for this project in terms of production process and equipment, energy utilization, pollutant, waste recycling, environmental management and so on based on characteristics of steel industry and in accordance with Cleaner Production Standard—Iron and Steel Industry (HJ/189-2006), Cleaner Production Standard -Coking Industry (HJ/126-2003) and Development Policies for the Iron and Steel Industry (July, 2005).

9.2 Overall environmental protection effect of the gas tank In metallurgic enterprises, the gas tank has the following functions: (1) To relieve the imbalance between generation and consumption in a short time, reduces and maintains a

minimal exhaustion amount, to achieve the best energy-saving effect. (2) To stabilize the pressures on the gas pipe network, caters to the thermal operation system of all the

heating equipment users, and the stability of the thermal operation system contributes to reducing the quota of gas consumption.

(3) To ensure accidents do not occur in times of drastic fluctuation of the gas amount, to guarantee the safety of each phase of system.

(4) To reduce the buffering amount of gas, transforms the coke oven gas that has a high thermal value, to reduce the replenishment of heavy oil, and improve the quality of steel rolling products.

(5) Recycles and reuses the converter gas, when used to store the converter gas, to reduce energy dissipation.

Therefore, in terms of overall function, the gas tank reduces gas dissipation, protects the environment and saves energies for the metallurgic enterprises.

9.3 Analysis of the cleaner production level of the selected tank type

9.3.1 Comparison of all tank types Gas tanks are generally divided into two major categories of wet gas tanks and dry gas tanks by the seal mode, and the dry gas tanks are categorized by the appearance and structural characteristics and seal mode as: polygon thin oil seal tank (MAN-type), cylindrical dry oil seal tank (Cologne type), cylindrical thin oil seal tank (new-type POC), and rolling curtain gas camber (Wiggins tank) etc.



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Table 9. 3-1 Comparison between dry gas tank and wet gas tank Wet gasholder Dry gasholder

Type of application M. A. N gasholder, Kelon gasholder, new type dry gasholder POC, Wiggins gasholder

Safety property

Weak in safe bleeding, ventilation building, nitrogen sealing, automatic control measures; not so good as dry gas holder in terms of sealing effect; weak in anti-corrosion, which usually causes corrosion punching.

Comprehensively designed in terms of safety measures, including safe bleeding pipe, emergency bleeding, ventilation, automatic monitoring device, with appropriate design in safety measures; far better than wet gasholder in terms of sealing effect, with relatively better anti-corrosion performance.

Technique

It is designed and applied in a relatively early stage, better than the dry gasholder in terms of service life, steel used, occupied land area.

The application of this technique is rather mature, and the application of this technology reliable, along with other advantages: better than dry gasholder in terms of long service life, steel used, finish paint consumption and occupied land area, able to effectively save the costs. Gasholder, with the features of gas storage and adjustment, can adjust the pressure surge of pipe network at any time, to ensure the stability of pipe network pressure; the transient maximum surge of produced volume and consumed volume of gas can be satisfied by the rapid up-and-down movement of the piston and the big throughput volume of gas.

Water consumption Significant water consumption

The gasholder does not consume water for its operation, and the water consumption is mainly due to the electric precipitation of converter gas.

Energy consumption

With higher pressure requirements and times than dry gasholder, along with relatively higher energy consumption.

Lower than wet gasholder

Air pollutant Relatively weak in sealing effect, with relatively higher gas discharge.

Good in sealing effect, with gas bleeding only happening under abnormal operating conditions.

Water pollutants

Complex in content, including wastewater containing cyanide, naphthalene, with large volume of wastewater produced.

Complex in content, including wastewater containing cyanide, naphthalene, with lower volume of wastewater produced than that of wet gasholder.

9.3.2 Technical advancement analysis The dry gas tank has a great advantage in terms of steel usage, life expectancy, coating usage and seal effect etc. , detailed as follows: (1) Life expectancy 1) Dry tank The dry tank is free of water corrosion and corrosion resistant, protected by greases on the side walls.The outer surface of the tank is only affected by the atmosphere, with a low repair fee.The tank top and the outer shell can be repaired without shutting off the gas.A repair is carried out once every 8-10a, with a life expectancy of more than 50a.



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2) Wet tank The tower links of the wet tank are often immersed in water when ascending and descending, under the alternation between wet and dry conditions.The wet tank is vulnerable to corrosion, with a high corrosion repair fee.In general, it is coated once every 5a, and the gas has to be shut off, which adds to the repair expense and affects the gas production, with a life expectancy of 15-20a. (2) Raw material use The utilization of the capacity of the dry gas tank is 90%, and that of the wet tank is 80%-85%.Calculated by available capacity, the steel consumption of gas tanks are as shown in Table 9. 3-2.

Table 9.3-2 Steel consumption of all tank types Capacity (10000 m3) Tank type 5 10 15

Dry/ (kg. m-3 ) 18. 11 13. 54 13. 12 Wet/ (kg. m-3) 17. 39 19. 05 16. 75 *Data source: Deng Maozhong, Guo Liang， Application of POC-type 10 ×10 4m3 Dry Gas Tank in SGIS [J], Southern Metallurgy, 2001[123]:17-20. As can be seen, for capacities ≤50,000 m3, the dry tank has a higher steel consumption; for capacities between 100,000 and 150,000 m3, the steel consumption of the dry tank is 27%-40% lower than that of the wet tank. (3) Floor space The height-diameter ratio of the dry tank is 1. 2-1. 9, with a small floor space, and that of the wet tank is typically 0. 8-1. 2, with a large floor space.The floor space of the wet tank is typically 1. 5-2 times that of the dry tank, as shown in Table 9.3-3.

Table 9.3-3 Comparison between the floor spaces of tank types Capacity (10000 m3) 2 5 10 15

Diameter m 39 44. 01 63. 8 68. 6 Wet tank

Bottom area m2 1196 1520 3195 3694 Diameter m 26. 3 37. 4 44. 7 53. 6

Dry tank Bottom area m2 525 1081 1547 2233

(4) Technical performance comparison The dry gas tank has been continuously optimized in terms of side board, stress bearing design and seal measures.Its technical performance is as shown in Table 9. 3-4.

Table 9.3-4 Summary table of the technical performance of the dry gas tank Dry gasholder

Side plate design The side plate of casing is cylindrical, Stress design The top of gasholder, piston are all spherical shape.Because the gravity center

of the piston is lower than its shape center, when the piston inclines, it can automatically return by the spherical surface automatically aligns its center, making the piston move up and down in a more balanced manner.

Bottom plate of the spherical surface

Convex bottom plate of the spherical surface reduces the volume of dead space, simplifying the operation of gas replacement and reducing environmental pollution, as well as contributing to the water discharge of the central bottom plate. Piston contacts with the cylindrical gasholder wall, sealed by thin oil which has the best sealing performance.

Sealing measures

Judging from its application for 2 years, the sealing material of rubber filler is better than the steel sliding plate in terms of softness, abrasion resistance and service life, and the designed service life of the new type sealing ring of the gasholder is more than 20 years.

Safe operation of piston 2 devices to prevent the revolve of piston are set, to ensure the piston’s guide



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roller move up and down, making the tilting force of piston effecting on the upright column, not on the side plate.

9.3.2 Wastes Emission Indexes (1) Comparison between the waste generation of the dry and wet gas tanks The wet tank sewage creates severe pollution.In times of repair, a large amount of phenol containing water all at once, which is hard to treat. As can be seen from the engineering analysis in section 3, the gas tank type adopted in this project produces a humble amount of wastewater, and the dry tank does not produce a great amount of wastewater to be treated, as shown in Table 9.3-5.

Table 9.3-5 Sewage Amount in One Repair of Wet Tank Capacity (10000 m3) 2 3 5. 4 10 15 Volume of water discharge (m3) 9500 13500 15900 31000 41000 *Data source: Pan Jinhui, Operating Characteristics of new dry tank and Its Application in An-Steel, 2006[5], 29-32 (2) Waste generation indicators of this project 1) Wastewater During the operating process of this project, a total of 47144. 75m3/a of phenol containing water is generated, all of which is released into the coking wastewater treatment plant for treatment, and serves as the replenishment for the water cleansing residues in the blast furnace after treatment and standard attainment; the clean sewage of the project (with a low dust content, it can be directly released into the clean sewage system) is 52164 m3/a, which enters the clean sewage system of the factory for reuse; the dust containing wastewater is derived from the electrical precipitator, with a total amount of 525600 m3/a, and is released into the wastewater treatment plant for treatment and reuse. The preliminary rain water and domestic wastewater are uniformly released into the coking wastewater treatment plant for treatment, and serve as the replenishment of the residue cleansing water in the blast furnace after treatment and standard attainment. In the gas tank area, zero emission of sewage can be achieved, and all the wastewater is treated and reused, and this is compliant with the requirement of cleaner production. 2) Solid Waste During the operation process of the gas tanks, no industrial solid wastes are produced. 3) Air pollutants The tanks adopted in this project are new dry tanks and Wiggins tanks.As can be seen from the operation practice of SGIS, these tanks have a good seal effect, no organized emissions of waste gases occur under normal circumstances, and only unorganized emissions from the tank section and emissions under abnormal circumstances are present. The annual emission of the main pollution factor CO is about 147. 226t/a.

9.4 Analysis on resource utilization and energy conservation

9.4.1 Analysis on gas collecting and resource conservation of gas tanks A mixture of blast furnace gas, coke oven gas and converter gas is finally formed in the gas tank area (~16kPa, 320000~355000Nm3/h, 7527kJ/Nm3) which is supplied to all mixed gas users of the whole Plant.If the mixed gas is calculated on the basis of 14 yuan/GJ, the daily reclaimed gas would bring a profit of 809,000~898,000 yuan.The result of the recycling is very good. Table 9. 4-1 indicates the equivalence to standard coal.

Table 9.4-1 Equivalence to standard coal of the gas collected by the gas tank

Tank type Medium Conversion ratio (10,000 tons coal

/100,000,000m3 gas)

Collected gas (100,000,000m3)

Converted into standard coal (10,000tons)

Blast furnace Blast furnace 2 33. 288 66. 576



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gas tank gas Industrial coke oven gas tank Coke Oven Gas 6 10. 95 65. 7

Civil coke oven gas tank Coke Oven Gas 6 1. 314 7. 884

Converter gas tank Converter gas 2. 5 17. 52 43. 8

Total 183. 96 At the same time, the gas tank is effective in reducing gas dissipation and emission of Air Pollutants CO\CO2; it is conducive to the improvement of the Plant’s environment as a whole.

9.4.2 Energy Consumption Analysis on Gas Tank Area Table 9. 4-2 indicates energy consumption of this project.

Table 9.4-2 Estimation of energy consumption

No. : Project Title: Coefficients of converting into standard coal Physical quantity Converting into

standard coal (t) I Power consumption 8008. 32 1 Fresh water for production 0. 11 t/103m3 632×103m3 69. 52 4 Nitrogen gas 0. 047 t/103m3 526×103m3 24. 72 6 Steam (0. 981MPa) 0. 105t/t 86t 9. 03

7 Power 0. 366t /103kWh 21598. 5×103kWh 7905. 05

II Conversion of collected gas into energy 1839600

III Net recovered energy 1,831,591. 68t After the gas tank is put into operation, the total recovered energy would be equivalent to 1831591. 68 t/a of standard coal. At the same time, gas recovery can not only effectively reduce Air Pollutants emission due to gas dissipation, but also reduce SO2 and smoke dust emissions by replacing the energy source of coal, which is conducive to improving the environment. Additionally, the following energy-saving measures are applied in the design: Energy-saving electromechanical devices are considered for power conservation. Apply high-efficiency energy-saving water pump.

9.5 Conclusion of Cleaner Production Assessment By adopting engineering design, the project is capable of reusing circulating water by a rate of 98. 5%, greatly improving the situation with generated pollutants and emissions compared to wet gas tank.Production wastewater is fully reused, and its emission is basically zero; as to Air Pollutants, the emissions are low and of mainly unorganized emissions. To sum up, through a cleaner production analysis on this project, the new dry gas tank (POC), and the Wiggins gas tank are at an advanced level domestically. It is recommended by this assessment to establish strict internal management rules and regulations, implement safe production guidance, make job training, execute post responsibility system, carry out cleaner production auditing as soon as possible, strengthen quality management, improve environmental management level, decrease pollutant discharge and increase the level of cleaner production further.

9.6 Analysis of Total Volume Control (1) Total volume of Air Pollutants Under normal circumstances, gas tanks involved in the project, such as the blast furnace gas tank, coke oven gas tank for industrial use, coke oven gas tank and converter gas tank for civil use, do not produce exhaust emission; Air Pollutants produced by the project come mainly from gas dissipation and



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fugitive emission under abnormal working condition. When gas tank upstream equipment (blast furnace gas pipeline network diffusing tower/coke oven gas pipe network diffusing tower/converter) work abnormally and cause changes in gas flow which, when reaching its destined maximum point, the gas tank releases excess gas through a safe diffusing tube on top of the gas tank by automatic control.When gas enters or leaves the tank through access of pipelines/valves, or the pressure booster works or the gas mixer is mixing gases, fugitive gas emissions occur. The main composition of coal gas is CO, the emission of which in the gas tank area, when put into operation, is about 38.772 t/a. and the amount of H2S is 0.148 t/a. Due to the absence of the corresponding total control index, in this assessment, there does not exist a total amount of Air Pollutants for the gas tank project. (2) Total volume water pollutants After operation of the project: wastewater generation amount is 602323.7m3/a, including 25310 m3/a of clean sewage water, which is collected by the company’s clean sewage water system; and 525,600 m3/a of dusty wastewater, which is collected and treated by the wastewater treatment plant of No. 3 Steel Plant for recycle in the turbid circulating water system. Wastewater of this project collected by the wastewater treatment plant of the coking plant is 51413.67 m3/a, including 6307.2 m3/a of oily wastewater, 480 m3/a of naphthalene containing wastewater, 36360.1m3/a of phenol containing wastewater, 6816.375 m3/a of domestic wastewater and 1450m3/a of initial rainwater which is collected by the collection tank and treated by the phenol/cyanide wastewater treatment station for recycle as blast furnace slag flushing water. The project would realize zero discharge of wastewater and no wastewater is discharged outside. Therefore, this assessment chooses not to apply for a total amount of water pollutants for the gas tank project.



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10 Pollution Control Measures and Technical Feasibility Study

10.1 Demonstration of Wastewater Control Measures Wastewater produced in the Project includes production wastewater, domestic wastewater and cleaner sewage. Sewage treatment measures include: 25310m3/a of clean sewage water enters into clean sewage water system in the whole plant for reuse. 525,600m3/a of dusty wastewater are discharged into The wastewater treatment plant of No. 3 Steel Plant for recycling. 36360.1m3/a of phenol containing wastewater shall be discharged into the phenol-cyanogen wastewater treatment station of the wastewater treatment plant in the coking plant for treatment; after the treatment, the water that meets relevant standards shall serve as the supplementary water of the blast furnace slag flushing water. 6307.2m3/a of oily wastewater shall be discharged into the phenol-cyanogen wastewater treatment station of the wastewater treatment plant in the coking plant for treatment; after the treatment, the water that meets relevant standards shall serve as the supplementary water of the blast furnace slag flushing water. 480m3/a of naphthalene containing wastewater was outsourced for treatment. 6816.375m3/a of domestic wastewater was discharged into a phenol/cyanide wastewater treatment station of the Coking Plant sewage facility for treatment to meet the standards prior to be used as make-up water for blast furnace slag flushing water.

10.2.1 Feasibility Analysis of Production Sewage Treatment Measures

10.2.1.1 Feasibility analysis on treatment of phenol containing wastewater and oil containing wastewater

(1) Existing phenol-cyanogen wastewater treatment technology the Plant The capacity of the Phenol-Cyanogen Wastewater Treatment Station is 2000m3/d, and a new Phenol-Cyanogen Wastewater Treatment Station with capacity of 2400m3/d will be built to meet the demand of 6m coke oven. The total amount of wastewater produced in #4 and #5 coke oven is 720m3/d, and the phenol-cyanogen wastewater produced in the 6m coke oven is expected to be 1008m3/d.The excessive capacity of the wastewater treatment station is 2400m3/d, while the wastewater discharged into the wastewater treatment plant in the coking plant from the tank area is 50933. 68t/a, i. e.appropriate 140t/d.Therefore, the wastewater treatment plant can treat the wastewater produced in the tank area. The A2/O biological denitrification process flow is adopted in the wastewater treatment facility, which is outlined as following: After passing through a series of preconditioning process of mix, degreasing, and dilution, wastewater is sent into the biological treatment system for further removing pollutants of the volatile phenol, cyanide, COD, ammonia nitrogen, and petroleum contained in the wastewater. A2/O technology, an abbreviation of Anaerobic-Anoxic-Oxic, is shortened from a denitrogenation and dephosphorization technology through anaerobic-anoxic-oxic organism.A2/O technology was developed in 1970s by a US expert based on anaerobic-oxic dephosphorization technology (A/O technology).An anoxic pool is added in anaerobic-oxic dephosphorization technology (A/O technology), and part of fluid mixture that flows out of the oxic pool flows back to the front end of the anoxic pool to achieve denitrogenation through nitrification. A2/O technology has the function of removal of organism, denitrogenation through nitrification and dephosphorization.The prerequisite of denitrogenation is complete nitrification of NH3-N, which can be completed through oxic pool.The anoxic pool achieves denitrogenation function, and anaerobic and oxic



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pools jointly achieve dephosphorization function. See Figure 9. 2-1 for its simple process. The water quality of output water of the Project meets Level I standard requirements set out in Section 20 in Water Pollutant Emission Limit (DB44/26-2001).

Figure 9.2-1 Availble Sewage Process Flow

(2) The feasibility of channeling oil and phenol containing wastewater into treatment facilities For the influent and effluent water quality of wastewater treatment station, see Table 10. 2-1.

Table 10. 2-1 In/out water quality index for the phenol/cyanide wastewater treatment station (unit: mg/l, except pH)

Items CODcr Volatile Phenol Cyanide Ammonia

Nitrogen Petroleum suspended particulate pH

Influent water quality <3500 <700 <20 <150 <50 <100 7~8

Water-sealing Water of CDQ Oven

<1500 <500 <5 <150 <50 <100 7~8

Effluent water quality ≤90 ≤0. 3 ≤0. 3 ≤10 ≤5. 0 ≤60 6. 5~7. 5

It can be seen from Table 10. 2-1, the wastewater quality in the gas tank area meets the existing acceptable standard of the phenol/cyanide wastewater treatment station of the Coking Plant. The phenol-cyanogen wastewater treatment station drains water at a rate of 42m3/h, which, meeting standard, is used as compensation water for slag removal water of blast oven, spraying water of raw material plant and for work section in the plant where water quality requirement is not high, so as to achieve zero discharge of the Plant; in case of maintenance and repair of coke dry quenching, such discharge water can be used as compensation water for coke wet quenching.

10.2.1.2 Feasibility analysis on treatment of dust containing wastewater Based on project research, the dust containing wastewater generated by electrostatic precipitation of converter gas shall all be emptied into sewage treatment facility of the No.3 Steel Plant for recycling and reuse. (1) Wastewater treatment process in No.3 Steel Plant Figure 10.2-2 shows the wastewater treatment process in No.3 Steel Plant The process is to make use of the turbid circulating water from the various branch plants of the company for the purpose of steel plate cooling, hence the water quality requirement is comparatively low.

Figure10. 2-2 Turbid circulating water system

(2) The feasibility analysis relied on

Turbid circulating pool

Supply pump

Gas washing Coarse-gra ins Separato r

Pl a te poo l Hot water pool

Cooling tower



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The 525,600 m3/a (60m3/h) of dusty wastewater from the ash removal water of the converter gas electrostatic precipitator is discharged to the turbid circulating water system in No. 3 Steel Plant.Then it is treated to meet the standards for recycling and reuse.The designed flow capacity of the turbid circulating water system is 1550 m3/h, fully capable of accommodating the dust containing wastewater of the project.

10.2.2 Feasibility Analysis of Domestic wastewater Treatment Measures Take SGIS as a whole, the domestic wastewater is discharged only after preliminary treatment.Therefore, domestic wastewater treatment needs to be strengthened in the whole plant. Since the phenol-cyanogen wastewater treatment station of the Coking Plant has adequate capacity to deal with about 95m3/d domestic wastewater of the Plant, and A2/O technology is a common technology for domestic wastewater treatment.It is suggested that the domestic wastewater of the Plant be treated by the phenol-cyanogen wastewater treatment station. The integrated wastewater treatment plant of the SGIS group is under planning, including 2X104m3/d domestic wastewater treatment device, which can be incorporated into the integrated wastewater treatment plant according to production need.

10.2.3 Construction of Wastewater treatment plant of SGIS Group The integrated wastewater treatment plant of SGIS group is under planning, and is described in detail as follows: (1) To strengthen technical reconstruction for the water treatment facilities of the existing production units so that all indexes of water treatment meet the national and local control standard and water recycle rate reaches over 90%. (2) To build a plant-wide domestic wastewater and production wastewater treatment plant, consider sewage recycle, and strive to achieve zero discharge. The water quality of sewage after treatment will meet Level I discharge standard in Water Pollutants Discharge Limit of Guangdong Province (DB44/26-2001). Recycled sewage meets the requirements of industrial recycle water, and recycled water meets Specifications on Design of Industrial Recycled Cooling Water Treatment (GB50050-95) and the water quality standard for industrial water of SGIS. (3) Design scale Capacity of the domestic wastewater treatment plant: 2. 0×104m3 per day.In consideration that resident numbers in eastern area account for 50% respectively compared with western area, Red Flag area and Northern area, 1# and 2# sub-plants of the domestic wastewater treatment plant are designed to have a capacity of 1. 0X104m3/d, covering an area totaling 1400m2 ~2300 m2. Production wastewater treatment plant: the designed capacity of the sewage treatment facility at the main discharge out is 8. 0×104m3/d, covering an area of 6300m2 ~9600m2 in total which demands rural land requisition. (4) Treatment technology 1 and 2 sub-plant for domestic wastewater treatment (10000 m3/d each) Adopt "Diatomite sewage treatment technology". Production wastewater treatment plant (80000 m3/d) Adopt "Diatomite sewage treatment technology" and "biochemical sewage treatment technology". (5) Use of recycled water Over 85% of the water used in SGIS is industrial water, 70% of which is cooling water with low water quality requirement. Substitution of recycled water for production new water for industrial recirculating cooling is easy to realize technically and in engineering, and allows to reduce consumption of new water per ton steel in SGIS.Therefore, the recycled water after treatment in the production wastewater treatment plant of SGIS can be mainly used for industry recirculating cooling. At the same time, it can be considered to collect initial rainwater which will be used for production in several times. (6) Progress The construction of SGIS wastewater treatment plant is at the stage of report and environment assessment,



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and its supporting documents are given in Appendix.

10.3 Demonstration of solid waste control measures The operation in the gas tank area does not involve production of industrial solid waste; domestic garbage of the living area is handled by the local sanitation services.

10.4 Demonstration of noise control measures There are many equipment in the Project that produce noise, with big source strength. On condition that technology is ensured during design, try to select low-noise equipment.Try to reduce the impact of noise on the surrounding environment by reducing noise through control of source strength and transmission means. Equipment model selection The noise source strength of the Project is 80~115dB(A). Take care to select high precision, good quality and low noise equipment. Installation of noise silencer A noise silencer is installed at the inlet and outlet of Roots blower and air compressor, which produce aerodynamic noise, to reduce its noise source strength. Such measures as vibration isolation and absorption are taken for the those equipment that produce noise as a result of operation, such as grinding machine. Optimized layout Arrange the equipment with bigger noise source strength far away from the sensitive points in the surrounding area. Noise isolation by sealing Sealed workshop is adopted in the Project for the layout noise source, and soundproof room is arranged in the workshop.Try to use building and structure to block the transmission of acoustic wave. At the same time, try to strengthen afforesting outside workshop and at plant border area, and use its screening to isolate noise to a certain extent and reduce impact on its surrounding environment.



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11 Public Participation

11.1 The purpose and significance of public participation The purpose of public participation is to understand and master extensively demands and opinions of the public to the project construction, and their attitude toward environmental problems caused by the project construction; stressing the importance of relationship and communication between the parties of project and the public, the public participation is one of the important parts of the environmental assessment work, which is an effective method to perfect decision-making, being helpful to deepen understanding of the potential impacts from the proposed project, helpful to determine and alternatives or design schemes as well as measures to reduce pollution, helpful to gain understanding and support of the mass in the region around the proposed project more extensively.All of views from the public participation shall be reported to the relevant administrative departments, which is favor of that the important issues which are possibly caused by the project related to the public are to be resolved.

11.2 Stage and mode of public participation According to requirements of the Regulation for Public Participation in the Environmental Impact Assessment (Huan Fa 006 [No. 28]) and the Implementation opinion for public participation in environmental management of construction projects in Guangdong Province (Yue Huan [2007] No.99), three stages of public participation for this project have been conducted.

11.2.1 Phase I: Project EIA information publicity On March 17, 2008, the construction unit publicized the information of this project on the website of Shaoguan Environmental Protection Bureau http://www.sgepb.gov.cn/ and the website of Shaoguan People’s Government (http://www.shaoguan.gov.cn/) respectively. Refer to Figure 11.2-1 and Figure 11.2-2 for details. According to the related regulations of the Regulation for Public Participation in the Environmental Impact Assessment (Huan Fa 006 [No.28]), the contents for this time of information publicity mainly include: the name and outline of the construction project; the construction unit and the contact means of the construction project; the name and the contact means of the environmental impact evaluation unit undertaking the environmental impact evaluation tasks; the working procedure and main working contents of the environmental impact evaluation task; the main proceedings and means for seeking public suggestions and opinions.



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Fig 11.2-1 and Fig 11.2-2 Announcement activity photos of EIA information announcement



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11. 2. 2 Phase II: Public participation in preparation stages of the Report In the process of compiling report, the public participation was conducted by issuing the public questionnaires and communicating with the village committees of surrounding residential points, and simultaneously, the methods and channels for feeding back the publicized opinions of the mass were provided, including telephone number, fax number, email address, and mailing address, etc. After the environmental impact evaluation results are almost concluded, a returning visit was done correspondingly according to the results of public participation during the compilation of the report.

11.2.3 Phase III: Publicity of the simplified version of the Report After the EIA report was completed initially, the abridged edition of report was announced separately on the external website of Shaoguan Environmental Protection Bureau http://www.sgepb.gov.cn/ and the external website of the environmental impact evaluation unit namely Huana Environmental Science Research Institute www.scies.com.cn from March 31, see Figure 11.2-3 for details.



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Fig 11.2-3 Picture of the simplified version of the Report



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11. 3. Mode and scope of the investigation (1) Mode of the investigation Public investigation was held based on progress of the EIA from April 3, 2008 to April 5, 2008, mainly by the cooperation of EIA holding organ and the Unit of the Project. The modes of written questionnaire and on-site consulting are mainly adopted; all investigations are recorded with real names. The questionnaire content see details in Public Questionnaire Form in Table 10. 3-1, see Annex presents the investigating personnel list. (2) Scope of the investigation The scope of inquiry for the project involves government agencies, units, settlements surrounding the converted plant site, villages, etc. , which are related or affected by the Coking Plant gas tank project of Guangdong SGIS Songshan Co. , Ltd. They are mainly the representatives of individuals or groups directly affected. The public participation survey includes villages of Lao Xiaojiang, Shan Zibei, Liantang, Da Yuantou, Xin Xiaojiang, Da Ping, Shaogang No. 1 Middle School and Maba No. 3 Primary School. (3) The investigation subjects The subjects to be issued are registered residents, staff of SGIS as well as representatives of local society around construction project, which deals with the representatives of individuals or regional groups directly affected (4) The people number for investigation Total 100 questionnaires were sent out in this investigation, and actually 97 valid questionnaires were recovered, of which effective recovery rate was 97%; the name, occupation, education level, place of residence etc.of the respondents were recorded simultaneously.

Table 11. 3-1 The Coking Plant gas tank project of Guangdong SGIS Songshan Co. , Ltd. EIA public participation survey questionnaire

Project profile: this project will build: 1 300, 000 m3 blast furnace gasholder, 1 100, 000 m3 industrial coke oven gasholder, 1 300, 000 domestic coke oven gasholder, 2 800, 000m3 converter gasholders, 2 gas mixing devices, 1 7500Nm3/h converter electrostatic precipitators, 1 280, 000Nm3/h mixing gas pressuring device, 1 7,000Nm3/h industrial coke oven gas pressuring device, 1 10, 000Nm3/h domestic gas pressuring device, 1 7,000Nm3/h industrial coke oven gas purifying device, 1 3,000Nm3/h domestic coke oven gas purifying device and other facilities supplementary for the above devices. Because the equipment are aged and have high energy consumption and safety threats, after the establishment of the new system, 1 old 100, 000m3 blast furnace gasholder, 20,000m3domestic coke oven gasholder and 1 coke oven gas pressuring station will be out of service. The emission impact of waste gas, wastewater, noise, and solid waste will be brought during the construction of the project, its main pollutants are coke dust, water of CDQ water seal, sewage, and noise, etc. A series of pollution control technology, environmental management system, risk mitigation measures will be taken after completion of the project construction, which will be applied to manage effectively all types of pollutants and mitigate environmental risks that may exist. In order to reduce impact on surrounding environment during process of project construction and managing operation, the opinions on the project on construction of public in the regional impact will be listened to extensively.All in society related are sincerely asked to express opinions fully! Name Age Nationality Of the town and

village/organ

Occupation Farmer ( ) Worker ( ) Businessman ( ) Technician ( ) Cadre ( ) Others ( ) Education level University and above () technical college () high school/polytechnic school () middle

school and below () Questions Please choose (tick √ at the answer you choose) 1.Do you know well about the construction of this project? Known ( ) Know a little ( ) I do not know ( )

2.How is the environment at the place you live? Good ( ) Ordinary ( ) Bad ( ) 3.According to you, what’s the most important problem of the local environment?

Air pollution ( ) Water pollution ( ) Noise pollution ( ) No pollution ( )

4．In your opinion, does the construction of this project impact your life and work?

Beneficial impact ( ) Advantage is more than disadvantage ( ) Adverse impact ( ) I do not know ( )



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5.According to you, to what degree will this project pose impact on the environment? Heavier impact ( ) Lighter impact ( ) no impact ( )

6.What kind of main environmental problem do you think will possibly arise during construction of the project?

Construction noise ( ) Construction dust ( ) Construction waste ( ) Land occupancy ( ) Construction wastewater ( ) Traffic management ( )

7.What kind of main environmental problem do you think will possibly arise after the project is put into full operation?

Waste gas ( ) Wastewater ( ) Noise ( ) Solid waste () environmental risks () others ()

8.How do you think that this project will play an role of residents employment in the region you live in?


9.How do you think that construction of this project impacts economic development in region you live in?


10.In your opinion, whether the measures taken during construction and operation of this project are perfect or not?

Yes ( ) No ( ) I do not know ( )

11.If the Unit of the Project takes effective environmental protection measures, whether you support construction of this project?

Yes ( ) No ( ) It doesn’t matter( )

12.After completion of the construction project, the Unit of the Project will adopt measures of dust removal facility, wastewater treatment facility, noise prevention, comprehensive utilization of solid waste, afforesting, etc. .What requirements and proposals else do you have:

11. 4. Result analysis of public investigation 11.4.1 The statistics on investigated people circumstances of public participation (1) The regional distribution of the core public representatives of the public participation This project is located in the area of SGIS. Based on the investigation of the location site of the project, the core public representatives of public participation for environmental and risk influence from the project mainly are people from the Old Xiaojiang Village, New Xiaojiang Village, Daping Village, Shanbeizi Village, Dayuantou village, Liantang Village, Yumin Village, Shuibei Village, Shaogang No.1 Middle School and No.3 Middle School of Maba Town. The core public representatives are 87, accounting for 89.7% of the total investigated people. In addition, the investigation also involves with the staff in SGIS, and residents in the surrounding areas including Meihua Village and Maba Town, etc.., with the investigated people of 10, accounting for 10.3% of the total investigated people. The regional distribution of investigated people is presented in Table 11.4-2. The structure statistics of public representatives is presented in Table 11. 4-3. Table 11.4-2 The regional distribution of the investigated people involved the public participation

Public Resident location of the public Quantity Ratic（%）

Old Xiaojiang Village 12 12.4 Liantang Village 12 12.4 Shanbeizi Village 9 9.3 Dayuantou village 9 9.3 New Xiaojiang Village 11 11.3 Shaogang No.1 Middle School 10 10.3

Public affected directly by the project

Maba No.3 Primary School 8 8.2



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Daping Village 6 6.2 Shuibei Village 5 5.2 Yumin Village 5 5.2

SGIS 5 5.2 Meihua Village 2 20.6 Other public Maba Town 3 30.9

Total 97 100.0

Table 11.4-3 The structure statistics of public representatives

Affected public Other public Total public Categories Structure Copies Ratio (%) Copies Copies Copies Ratio (%) Younger

than 30 years old

6 6.9 3 3.4 9 10.3

30～40 years old 38 43.7 4 4.6 42 48.3

41～50 years old 22 25.3 4 4.6 26 29.9

51～60 years old 15 17.2 0 0.0 15 17.2

Age

Older than 60 years old 5 5.7 0 0.0 5 5.7

Primary school-junior middle school

40 46.0 1 1.1 41 47.1

Senior/secondary school 32 36.8 3 3.4 35 40.2

Junior college 14 16.1 4 4.6 18 20.7

Education

College above 1 1.1 2 2.3 3 3.4 Farmer 38 43.7 1 1.1 39 44.8 Worker 25 28.7 5 5.7 30 34.5 Teacher 14 16.1 0 0.0 14 16.1

Businessman 4 4.6 1 1.1 5 5.7 Cadre 2 2.3 2 2.3 4 4.6

Occupation

Other 4 4.6 1 1.1 5 5.7 Total 87 100.0 10 100.0 97 100.0

(2) Representative analysis of the investigated people of public participation The basic situation statistics result of people who involved the investigation of public participation shows that: (1) The people involved in this investigation are mainly individuals or representatives of groups who are impacted directly by construction of this Project, wherein 87. 6% of investigated numbers are the public at sensitive points of surrounding environment around the evaluated region. (2) The questionnaire shows that: the people taking part in the public participation survey are mostly local residents and those at the local government agencies who are relatively familiar with the place where the project is located. People surveyed generally have an education of junior high school up to university, and they can reflect views of comparative objectivity and thoroughness. Therefore, the investigating result of the public participation has a certain representation.



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11. 4. 2 Overall Findings of Public Participation Survey (1) The statistics on investigation result Comprehensive statistics, summary and drawing the conclusion have been conducted on investigation result. For comprehensive statistics result in detail, see Table 11. 4-1 (statistical data in the table mainly bases on the 97 valid questionnaires).

Table 11. 4-1 Statistical table for investigation result of public participation Affected public Other public Total public Investigated

questions (97 effective questionnaires)

Opinion Copies Ratio (%)

Copies Ratio (%)

Copies Ratio (%)

1) know well 12 13.8 3 30.0 15 15.5 2) know a little bit 58 66.7 3 30.0 61 62.9

1.Do you know well about the construction of this project?

3) I don’t know at all 17 19.5 4 40.0 21 21.6

1) good 0 0.0 0 0.0 0 0 2) average 50 57.5 8 80.0 58 59.8

2.How is the environment at the place you live? 3) bad 37 42.5 2 20.0 39 40.2

1) air pollution 50 57.5 6 60.0 56 57.7 2) water pollution 12 13.8 2 20.0 14 14.4 3) noise pollution 24 27.6 2 20.0 26 26.8

3.According to you, what’s the most important problem of the local environment? 4) no pollution 1 1.1 0 0.0 1 1

1) positive impact 21 24.1 4 40.0 25 25.8 2) more positive impact than negative one

40 46.0 5 50.0 45 46.4

3) negaive impact 21 24.1 0 0.0 21 21.6

4．In your opinion, does the construction of this project impact your life and work? 4) I don’t know at

all 5 5.7 1 10.0 6 6.2

1) much impact 57 65.5 3 30.0 60 61.9 2) little impact 30 34.5 7 70.0 37 38.1

5.According to you, to what degree will this project pose impact on the environment?

3) no impact 0 0.0 0 0.0 0 0

1) construction noises 30 34.5 4 40.0 34 35.1

2) construction dusts 25 28.7 3 30.0 28 28.9 3) construction wastes 0 0.0 3 30.0 3 3.1

4) occupied land 20 23.0 0 0.0 20 20.6 5) construction wastewater 7 8.0 0 0.0 7 7.2

6. What kind of main environmental problem do you think will possibly arise during construction of the project?

6) traffic control 5 5.7 0 0.0 5 5.2 1) noises 15 17.2 1 10.0 16 16.5 2) waste gas 14 16.1 3 30.0 17 17.5 3) wastewater 18 20.7 2 20.0 20 20.6 4) solid wastes 3 3.4 0 0.0 3 3.1 5) environmental risks 27 31.0 4 40.0 31 32

7.What kind of main environmental problem do you think will possibly arise after the project is put into full operation? 6) others 0 0.0 0 0.0 0 0 8.How do you think 1) positive impact 22 25.3 4 40.0 26 26.8



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2) more positive impact than negative one

38 43.7 3 30.0 41 42.3

3) negaive impact 23 26.4 0 0.0 23 23.7 4) I don’t know at all 4 4.6 3 30.0 7 7.2

1) positive impact 46 52.9 2 20.0 48 49.5 2) more positive impact than negative one

16 18.4 6 60.0 22 22.7

3) negaive impact 10 11.5 1 10.0 11 11.3

9.How do you think that construction of this project impacts economic development in region you live in? 4) I don’t know at

all 15 17.2 1 10.0 16 16.5

1) yes 37 42.5 5 50.0 42 43.3 2) no 3 3.4 1 10.0 4 4.1

10.In your opinion, whether the measures taken during construction and operation of this project are perfect or not?

3) I don’t know at all 47 54.0 4 40.0 51 52.6

1) supportive 57 65.5 6 60.0 63 64.9 2) whatever 23 26.4 4 40.0 27 27.8

11.If the Unit of the Project takes effective environmental protection measures, whether you support construction of this project?

3) opposed 7 8.0 0 0.0 7 7.2

Based on the statistics of the survey findings, a general view can be obtained: (1) People surveyed indicate their knowledge of the Project: 15. 5% say yes, 62. 9% say they have some knowledge of it, and people who say no accounts for 21. 6%. The survey results show that the majority of the people have little understanding of the Project.It is proposed that the owners make greater efforts to publicize the Project so that the people have more understanding of it and to avoid circumstances of misunderstanding due to a lack of knowledge of the Project on the part of the people. (2) The number of people, who think the existing baseline of the local environment is passable, account for 59. 8%; those who say it is bad account for 40. 2%.The survey shows that the majority of the people currently living in the area think the quality of the environment is passable, but the environmental existing baseline needs to be improved. (3) 57. 7% of the people surveyed believe the main local environmental problem for the present is air pollution; instead, 26. 8% believe it is noise pollution, 14. 4 % believe it is water pollution, and one person thinks there is no pollution.The results show that the vast majority of the people surveyed have a rather focused awareness of the local environmental problems. (4) 25. 8% of the people surveyed believe the construction and operation of the project is conducive to local life and economic development, 46. 4% believe the advantages outweigh the disadvantages, 21. 6% believe the project would have a negative impact, 6. 2% think there is no effect.The survey shows that the majority of the people believe that the Project will certainly have an impact on their own lives and the local economic development. (5) 58. 8% of the people surveyed believe the Project would have a greater impact on the environment than what is believed by the other 41. 2%The survey shows that the majority of the people interviewed consider the Project would have certain impact on the environment.The Unit of the Project should increase publicity efforts on the masses on the basis of the implementation of various environmental protection



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measures; so that they have a better knowledge of the environmental measures supporting the Project, and to eliminate their concerns over the possible environmental impact of this Project. (6) People think that the possible environmental problems during the Project construction come primarily from construction noise (34%) and construction dust (28. 9%), followed by land requisition (20%), construction wastewater (7. 2%), and finally, construction garbage (5. 2 per cent) and traffic management (5. 2 per cent). The survey shows that the vast majority of the respondents have a rather focused awareness of the possible environmental issues related to the Project construction. (7) People think the possible environmental problems, after the project is put into full operation, will primarily be environmental risk (32. 0%) and wastewater (20. 6%), followed by exhaust gas (17. 5%) and noise (16. 5%), and finally, solid waste (3. 1%). The survey shows that the vast majority of the respondents have a rather focused awareness of the possible environmental issues related to the Project operation. (8) 26. 8% of the people surveyed believe the Project would be conducive to the development of local economy, 42. 3% believe the advantages outweigh the disadvantages, and 23. 7% believe the effect will be negative, while 7. 2% show no interest. The survey shows that the majority of the people believe the Project will play a facilitating role on the employment opportunities of local residents. (9) 49. 5% of the people surveyed believe the Project would be conducive to the development of local economy, 22.7% believe the advantages outweigh the disadvantages, and 11. 3% believe the effect will be negative, while 16.5% show no interest. The survey shows that the majority of the people believe the Project will have a beneficial impact on the development of local economy. (10) 43. 3% of the people surveyed find perfection in the measures taken for the construction and operation of the Project, 4.1% thinks they are not perfect, while 52. 6% show no interest.The survey shows that the majority of the people have little knowledge of the measures taken for the Project.It is proposed that the Unit of the Project give greater publicity to let more people have a thorough understanding of environmental measures for the Project and eliminate misunderstanding or concern over the Project because of ignorance. (11) If the Unit of the Project takes effective environmental protection measures, people who support the construction of the Project would account for 64. 9%, 27.8% say they do not care one way or the other, while 7. 2% say they do not support it.The survey shows that the majority of the people support the Project, but there are a small number of people who are against it.The Unit of the Project should make every effort to implement environmental protection measures to minimize the impact of the Project on the environment and, on the basis of this, should make greater publicity efforts to eliminate misunderstanding of the Project on the part of the masses due to ignorance.In addition, the Unit of the Project should step up communication with the neighboring residents, understand in a timely manner the impact on their life by the operation of the Project, and try to reconcile the contradictions on both sides.

11.4.3 Opinion Survey and Clarification on the feedback

11.4.3.1 Main objections There are five people in the public survey who have expressed their disproval in writing of the construction of the Project and their views are summarized as follows: (1) The construction of the Project in the rural areas has brought air pollution, noise pollution, dust pollution and water pollution, contaminated vegetables and crops, and brought to the local villagers serious economic losses and health hazards. (2) The construction of the Project caused closure of the ways of access to the village and adversely affects the life of the villagers; hence, demanding the plant to open the roads. (3) The construction of the Project have resulted in serious economic losses to the surrounding countryside, fish farms, and crops, inflicting harm on the health of people; hence, demanding the plant to pay attention to resolving the existing problems. (4) Explosion and leakage risk of the gas tank is existed in this project, which has potential risk for safety of villagers.



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11.4.3.2 Opinion Survey and Clarification on the feedback (1) Traffic management and security issues during construction: the Unit of the Project will see to it that the construction unit shall adopt standard protective measures, make good use of notices and traffic control during construction, avoid causing inconvenience as far as possible to villagers’ life around the construction site . (2) Air pollution, water pollution and other issues during operation: after the completion of the technical renovation of the project, there will not be production wastewater, only a small amount of domestic wastewater which will not affect the drinking water quality of nearby residents.Moreover, after the technical renovation, emissions of air pollutants will be drastically reduced.The Project itself is a cleaner production project.The Unit of the Project commits itself to take effective environmental protection measures, and increase the intensity of publicity to surrounding residents, so that they understand the environmental protection measures supporting the Project are capable of avoiding environmental impact to a maximum degree, and can be run stable and safe. (3) Economic losses by the construction of the project: This project can effectively collect gas from SGIS and reduce gas emission impact on the environment while conserving energy. Therefore, the operation will not cause serious economic losses; on the contrary, it will play a facilitating role in improving the local environment.It will have a positive impact on the economy.In order to alleviate the misunderstanding and resentment of the masses, and reduce the pressure of running the Project, the Unit of the Project will strengthen communication with the public, and carry out exchange of views on the vital interests which concern them. (4) Environmental risk issues of the gas tank:

11.4.4 A Summary of Opinion Feedback and Commitment on Part of Unit of Project

Based on statistics of the public participation survey, the 7. 2% of people who object to the construction of the Project mainly live in the surrounding area.Key public concerns involve the questions of disturbance in the construction period of the Project and security issues, as well as possible air, water pollution problems during operation.A return visit on the part of the Unit of the Project was paid to Villages Da Yuantou, Lao Xiaojiang and Xin Xiaojiang, where the opinions were comparatively focused, and commitment was made related to pollution prevention and control measures; for detail, please see Annex × × ×, Opinion Summary and Commitment by the Unit of the Project, see Table 11. 4 - 1. All the people visited agree with the various environmental protection measures and management programs which are to be adopted on the part of the Unit of the Project, and expressed support and active cooperation with the Project's construction.

Table 11. 4-1 Summary of public opinions and response measures

No.: The number of people with the same opinion Summary of opinions Response measures by the Unit of the

Project

1 1 This project may possibly have gas leak accident;

Prepare the residents with drills, and organize them to leave upon any leak accident occurred.

2 2

Road closed up due to the project construction will pose significant impact.

Construction unit implements the standardized construction protection measures, and issue announcements and take traffic control during the construction period.

3 3

Serious economic losses to the surrounding rural areas, fish farms and crops caused by the construction of the Project

Take effective environmental protection measures to reduce the pollution, and strengthen communication with the public.

4 4 Potential risk for safety of villagers resulted from

Take effective risk prevention measures to reduce the risk and establish relevant risk



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explosion and leakage risk of the gas tank.

response plans.

11. 5 Public opinions on the notice of the simplified version of the Report

No opinion received during the period of the notice

11. 6 Conclusion on public participation

According to the statistical result of the public participation survey form issued, generally, 72.2% of the respondents expressed support of the Project, 22. 7% of the respondents said it does not matter one way or another, 5.1% of the respondents clearly expressed opposition due to concerns over air, water pollution, traffic inconvenience and economic losses during construction of the Project. People who raise objections mostly are villagers of the surrounding area, and they do not have enough confidence on the Project, and are worried that the project may cause gas leakage affecting the health of neighboring residents. But after further communication as well as the commitments made by the owner, the people who opposed the Project are able to understand and support the implementation of the Project and its construction.So, if the Unit of the Project take measures on the “3 wastes” treatment in accordance with the requirements of environmental protection, meet emission standards, strictly implement the various management measures and safety precautions proposed by the EIA report, and reduce the impact on the life of the residents and on the environment following the completion of the Project, the majority of the public support the construction of the Project.



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12 Analyses of Compliance to Industrial Policies and Location Reasonability

12. 1 Analysis of compliance to industrial policies

12. 1. 1 Analysis of Compliance to State Industrial Policy (1) Compliance to Guiding Directory for Industrial Structure Adjustment (Decree No. 40, the National Development and Reform Commission) According to relevant provisions of Decree No.40 by the National Development and Reform Commission, the recovery and utilization of gases from blast furnace, converter and coke oven falls into the category of Encouragement. The construction of the gas tank area enables collecting of gases from blast furnace, converter and coke oven for users, which falls into the category of Encouragement in Decree No.40. (2) Analysis of Compliance to Development Policies for the Iron and Steel Industry (July, 2005) The objectives prescribed in the Development Policies for the Iron and Steel Industry is to “improve environmental protection and resource comprehensive utilization, save energy and reduce dissipation based on the concept of sustainable development and recycling economy. ” To maximally enhance the level of comprehensive utilization of gas, wastewater and solid waste, strive to achieve zero emissions and establish a recycling-type steel plant. The steel enterprise must develop technologies of reusing residual heat and energy to generate electricity.” The construction of the gas tank area effectively enables the collection of gases from blast furnace, converter and coke oven, reduces gas dissipation and provides high-quality energy source for industrial and commercial use.This project is an example of comprehensive recovery and utilization of gases, in line with the policy objectives set in Development Policies for the Iron and Steel Industry.

12. 1. 2 Analysis of Compliance to Local Industrial Policy Compliance to the Guangdong Outline of Environmental Protection Planning (2006-2020). Guangdong Outline of Environmental Protection Planning (2006-2020) prescribes that “the steel industry shall develop resource-saving technologies which reduce the gas emission by the sinter machine, recycle the waste gases, recycle the dusts and process and dispose the waste steel, to reduce energy and material dissipation, and decrease the emissions of pollutants such as sulfur dioxide and dusts”.Strengthen the technical alteration of the exiting enterprises, enforce cleaner production, and the newly built steel projects should attain an advanced level in cleaner production domestically. ” The purpose of the project is to collect and reuse gases in SGIS plant area, to provide clean energy source for the steel plant and the residents.It is conducive to raising the cleaner production level of the SGIS Group and to improving the overall air quality. This project complies with the prescriptions for the steel industry by the Guangdong Outline of Environmental Protection Planning (2006-2020).

12. 1. 3 Validity of land usage of the project Land occupied area of the project is 72600 m2, relevant land procurement procedures have been completed, see the Appendix. Red line of the land use is under work by the SGIS group and the local land resource department.

12. 2 Reasonability Analysis of Factory Location

12. 2. 1 Analysis of Layout Reasonability According to the general layout of SGIS, this Project shall be located on the north part of the company’s



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production area, with the rechanneled Meihua River on its north, the existing gas tank area on its west, the electric blast station of No. 6 blast furnace on its south, and the farm land and fish farm on its east. The location of the project complies with the internal planning of land use of SGIS.

12. 2. 2 Reasonability Analysis of the Overall Layout (1) The project site selection is consistent with the SISG land planning.The building layout and fire spacing meet relevant regulations in Code for Fire Protection Design of Buildings (GB 50016－2006),

Code for Design of Urban and Rural Gas Supply (GB 50028－2006) and Design Code for General Layout

and Transportation in Metallurgical Enterprise (YBJ 52－88). The distance for fire protection between gas tank and peripheral buildings shall satisfy relevant specifications in Code for Design of City Gas Engineering (GB 50028-2006). It can be seen from above that the plane layout and fire protection distance of the new-built buildings satisfy relevant design codes, and layout of fire compartments are arranged strictly as Code for Design of Building Fire Protection and Prevention (GB 50016-2006), which can guarantee safety operation of the gas tank area to a certain degree. (2) In consideration of the flood control requirement of Meihuahe River and its connection with peripheral roads, the five gas tanks and service shop will be arranged on bench of El. 66m, and the gas purification and pressurization facility and water treatment plant will be arranged on the bench of El.70m. The indoor and outdoor difference of the buildings is 0. 3m in datum mark. (3) Anti-seismic intensity in the project area is designed as 6.

12.2.3 Feasibility of Prevention Distance According to the prescriptions of the Technical Methods for Formulating Standards of Air Pollutants Emission (GB/T13201-91), when industrial enterprises are unable to release several hazardous gases, the prevention distance needed is calculated as the maximum value of Qc/Cm. According to the the engineering analysis, this EVA is carried out based on the disorganized emission of dusts. From the calculation, the desirable health protection distance is set at 200 meters. All the distances between nearest sensitive points and the main pollution facilities meet this requirement of this health protection distance. The location of SGIS, where the project is located, is as shown in Figure 2. 2-2.The requirements for the health and safety distances are met.



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13 Analysis of Economic gain and loss

The analysis on environment benefits and losses focuses on the nature of the project and the local conditions to determine environmental impact factors, and to give an overall economic assessment on the environmental impact within the scope affected by the project. According to theoretical development and many years of practical experience, it is impossible for any project to give an economic assessment on all the environmental impact factors.Therefore, the analysis on environment benefits and losses focuses on the main environmental impact factors to give an overall analysis and assessment on investment costs, economic benefits, social benefits and environmental benefits (performances), as well as the environmental impact cost / benefit ratio of the project.

13.1 Investment on Environmental Protection of the Project to be built

13. 1. 1 Main Measures of Environmental Protection (1) Measures of Waste Gas Disposal When the gas tank is in abnormal condition and need maintenance, a small amount of gas is released through a diffusing tube on top of the gas tank.The gas is composed mainly of CO, CO2, CH4, N2 etc. , and its dust concentration is less than 10mg/m3 which meets emission standards. (2) Measures of Wastewater Disposal Oily wastewater, phenol containing wastewater, naphthalene containing wastewater, the initial rain water and domestic wastewater are all discharged into the Coking Plant’s wastewater treatment plant for treatment to meet the standards prior to used as make-up water for blast furnace slag flushing water. Dusty wastewater mainly comes from electrostatic ash removal apparatus of converter gas tank; and it is discharged into No. 3 Steel Plant for treatment before entering turbid circulating water system for reuse. The clean sewage water of the project comes mainly from the spray cooling tower of the blast furnace gas tank, coke oven gas pressure booster stations, mixed gas booster stations, as well as ash-containing wastewater of converter gas tank body (as per data extrapolation, it can be discharged directly into the clean sewage system due to extremely small ash content), and enters the clean sewage water system of the plant for reuse. (3) Foresting Engineering Take full advantage of the open space in the gas tank area, green access on both sides of the roads and the surrounding areas; the green area accounts for 25%, totaling about 18,200m3.

13.1.2 Investment on Environmental Protection This project is environmental protection and energy saving project.The total investment is 344.52 million RMB, of which applies directly for environmental protection is about 1.1272 million RMB, accounting for 0.33% of the total investment. See Table 13. 1-1 for the detailed estimation of environmental protection investment.

Table 13. 1-1 Environmental protection investment of the project.

No. : Items of environmental protection investment.

Cost of the project (10,000 Yuan)

Proportion in the total investment on environmental protection: %

1 Wastewater treatment facility 58. 12 51. 56 2 Foresting 54. 6 48. 44 Total 112. 72 100. 0



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13. 2 Analysis of Overall Environment and Socioeconomic Performance of Project

13.2.1 Social Performance Analysis SGIS Songshan Co. , Ltd.increases investment and constructs the gas tank project in its production area, not only meeting the basic strategy for national steel industry development, but also having its unique advantages.Furthermore, the project can realize the safe supply and application of gases, and guarantees the balance between gas production and utilization. Upon completion of the project, it can not only add to the fiscal revenue of the area where it is, but promote the development of agriculture and forest in the surrounding areas, create job opportunities in the local area, and improve the living standard and quality of the peasants.During the operation period, the project provides 83 posts, which create a multitude of job opportunities for the superfluous labor and laid-off workers in the local area, and contribute to improving the living standard of the local people and to maintaining social prosperity and stability. Additionally, the project is of great significance on stabilizing the pipe network pressure, guaranteeing the balance between gas production and utilization, realizing the safe gas supply and application, reducing gas discharge, saving energy and protecting surrounding environment.

13.2.2 Analysis of environmental profit and loss (1) Analysis of environmental profit and loss The by-products, e. g.coke oven gas, blast furnace gas and converter gas produced during the production process in a steel enterprise, as a high-quality gas fuel, are the valuable energy for the enterprise. The project reduces the dispersing of gases into environment by recovering the coke oven gas, blast furnace gas and converter gas, protecting surrounding environment and saving energy, which has an important meaning for realizing the energy balance and energy saving in an enterprise. After the project is completed, an outdated 100,000 m3 blast furnace gas tank, 20,000 m3 civil coke oven gas tank and a coke oven gas pressurization station will be put out of running, thus such problems as aged device, high energy consumption and hidden trouble of safety etc.will be solved efficiently. The project design, taking the requirements of environmental protection into consideration, executing every environmental protection standards strictly, and using advanced, mature and credible process, reduces the discharge of pollutant thoroughly. Meanwhile, the advanced pollution prevention and control measures are taken practically in dealing with pollutants produced during the production process so as to yield a better environment profit . (2) Analysis of environmental profit and loss The discharge and density of air pollutants during the production process of this project can both meet the requirements of relevant standards. By estimation, the ambient air quality in assessment area after the project is implemented can still be maintained at the current level under normal conditions. The cooling water is recycled, the dedusting water is transferred to the wastewater treatment system of the converter, the phenol-cyanogen wastewater is sent to the water treatment system of coking plant, and the oily wastewater, civil wastewater and cleaning water for coke oven gas purification station device are treated by the plant uniformly; according to analysis, the water environment in the assessment area won’t be changed due to the implementation of the project. Several control measures are taken for noise source that the acoustic environment functions won’t be changed due to the implementation of the project. Therefore, the negative influences caused by the construction of the project to the surrounding environment are limited.

13.2.3 Economic Performance Analysis

13.2.3.1 Analysis of financial capability After the project is put into production, the total amount of annual average profit will be increased by 66. 96 million Yuan, the annual profit after tax will be 50. 22 million Yuan, the investment profit rate will be 19. 44%, the profit margin of the project after tax will be 19. 69%, the financial net present value will be 143.



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68 million Yuan and the investment recovery period will be 6. 18 years. All above indicate good financial profit prospects.

13.2.3.2 Profit of wastewater control It is planned to construct a new wastewater treatment system with a total investment of 581,200 Yuan, and the depreciation fund is 30,000 Yuan/year.

13.2.3.5 Comprehensive Performance Analysis According to the analysis above, the estimable project annual comprehensive profit is seen in Table 13. 2-1.

Table 13. 2-1 Analysis of annual comprehensive profit of the project (in 10 thousand Yuan) No. : Items Comprehensive benefit (10,000 Yuan) (+,-) 1 Annual profit +5022 2 Cost of wastewater treatment -3. 0 3 Total +5019

13. 3 Conclusion to the Analysis of Environmental and Economic Gain and Loss

The total investment of the project is 344.52 million RMB, in which the environment protection investment is approximately 1.11272 million RMB, accounting for 0.33% of the total project investment. Measurable environmental and economic performance produced is about 41. 738 million yuan, in the case of 10 years it will be 417. 38 million yuan. The performance/fee ratio is above 1, indicating the environmental and economic performance of this project is good. The environmental and economic performance of this project is a positive one, and the project itself is environmentally protective and energy saving. The implementation of the project, not only avoiding the dispersing of gas polluting the air environment, but also saving and recovering energy, reduces the discharge of various pollutants greatly and presents obvious environmental profits. In conclusion, the environmental protection investment of this project is reasonable, and the performance of environmental treatment is obvious. Therefore, from the perspective of environmental economy, this project is feasible.



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14 Engivorment Mangement and Monitoring Plan

To establish a sound environment management and monitoring system will facilitate the application of State and local environmental protection regulations and policies, effectively improve the environment quality in the area where SGIS is located, as well as rationally exploit environmental resources to serve both SGIS’s economic development and environmental protection.

14. 1 Responsibilities of Environment Management Organization

(1) Conscientiously implement environmental protection related laws, regulations and standards issued by the State or the local government.Assist SGIS’s top management to coordinate the company’s development with environmental protection activities. (2) Assist SGIS’s top management to establish the company’s environmental protection guidelines, environment management goals, index and plans, including monitoring plan etc. (3) Monitor the implementation of the company’s environment management plan, establish systems and policies related to environmental protection, collect environmental statistics, create pollution source archives, and make environment monitoring report, etc. (4) Supervise the operation and maintenance of environmental protection facilities to ensure normal and stable operation. (5) Organize environmental protection related education and training for staff responsible for company development. (6) Responsible for outside liaison regarding environment related affairs.For example, learn the issue and revision of environmental protection related government policies and regulations, and organize the implementation; responsible for environmental protection related liaison, explanation and reply; and coordinate company activities or measures involving public interests. (7) Make efforts to facilitate the establishment of environment management system as per ISO14000 Standard. (8) Carry out cleaner production audit to pollutant discharge enterprises established or run by the company.To those who fail the audit, suspend their pollutant discharge permits and take severe measures to ask for corrections in a fixed period of time.

14. 2 Environment Monitoring System

14. 2. 1 Introduction of SGIS Environment Monitoring Station The environment monitoring of SGIS Songshan Co. , Lt is mainly undertaken by SGIS Environment Monitoring Station. Currently, there are 20 monitors in the SGIS monitoring station.Among them, 6 are professionals, accounting for 30% of the total number of staff working in the station. The SGIS Monitoring Station is comprised of three departments – the general office, the atmospheric monitoring lab and the water quality monitoring lab.The atmospheric monitoring lab consists of three teams – the air, smoky dust (exhaust gas) and noise monitoring teams.The SGIS Monitoring Station has a 700m2 monitoring building with 98 sets of various monitoring apparatuses and data processing machines for water, gas, dregs and noise monitoring, including atomic absorption spectrophotometer, ultraviolet spectrophotometer, visible spectrometer, gas chromatograph, oil analyzer, fume tester, thermostatic and continuous air sampler, sound level meter and PC etc.The Station is also equipped with a monitoring car.The total value of equipment and apparatuses is approximate to 1 million yuan. The Station is capable of monitoring and analyzing 100 items, including water quality and wastewater quality, atmospheric environment quality and exhaust gas pollution source, environmental and equipment noise, soil, biology and solid wastes etc.



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14. 2. 2 Monitoring Range of SGIS Monitoring Station 1) Atmospheric Monitoring a Environment Quality Factors Natural dust fall content, TSP, SO2, NOX, BaP(sampling). b Atmospheric Parameters Atmospheric pressure, temperature, humidity, wind speed, wind direction. c Monitoring Frequency and Cycle

Dust fall (natural dust fall): with a monitoring period of 30±2 days, 12 months/year. TSP：

Lab analysis of continuous sampling – sample every other two days with 24±0. 5 hours continuous monitoring.Monitor 5-6 days/month, 12 months/year. SO2 NOX: Lab analysis of continuous sampling – 24±0. 5 hours continuous sampling every other day.Monitor 14-16 days/month, 12 months/year. CO: the monitoring period is the same as that for TSP, and the sampling frequency is 3 times/day. Bap: Same as TSP for living area.For production area, 5-6 days of monitoring in the first month of each quarter.Use one sheet of filter membrane per day to monitor 1. 5 hours in both the morning and the afternoon. 2) Wastewater Monitoring a Monitored items Mainly 44 items, including PH, SS, COD, Phenol, CN-,oil, S2-,Cu2+,Pb2+,Zn2+,As,F-,Cr6+,total Cr,HCO3

-,CO32-,OH-,Cl-,SO4

2-,total hardness, ammonia and flow rate. b Monitoring point Total 37 monitoring sites located at discharge outlets of individual factories, inlets and outlets of treating facilities for monitoring hospital sewage, water for production, domestic water and underground water. c Monitoring Frequency and Cycle Industry Wastewater and Hospital Sewage: Once/ten days, three 10-days/month, 12 months/year. Production water, civil water, underground water: once per half year (high water and low water periods). 3) Exhaust Gas Source Intensity Monitoring a Monitored items Mainly 25 items, including emission concentration and volume of smoky dust, fume, SO2,NOX,CO, sulphur content in fume, fume flow rate, velocity of flow, pressure, temperature and blackness etc. b Allocation of Monitoring Sites Set up monitoring sites at inlets and outlets of flues, the major pollution source, in individual factories. c Monitoring Frequency and Cycle Monitor once a month for smoky dust and smoke color, and once a year for dedusting efficiency. 4) Noise Monitoring a Noise within Factory Spots: SGIS and four points in east, south, west and north of all the manufacturing plants Monitoring period and frequency: once per quarter, 4 time per year. b Source strength Spots: according to Technical Specifications for Environmental Monitoring (Noise Section). c Monitoring period and frequency: once a year. Current Status and Future Plan The following aspects should be strengthened to better serve the need of environment monitoring: 1) Improve the equipment level in the monitoring station, and strengthen the implementation of updating

existing equipment and adding more. A Replace apparatuses and equipment that cannot satisfy the need of monitoring.



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New apparatuses needed are mainly advanced analysis apparatus and electronic analytical balance imported from abroad.Automatic atmospheric monitoring apparatus and precision sound level meter should be replaced.

B Improve sampling and measuring devices at the chief wastewater discharge outlet of SGIS, sample and measure at wastewater outlets of individual branch factories, and equip the outlets with automatic wastewater flow rate recorder.

2) Add one monitoring car. 3) Beef up the station with 5 to 6 more special technicians. 4) Establish automatic atmospheric environment monitoring station. 5) Equip sampling port at chief wastewater discharge outlet with automatic wastewater flow rate

measuring device. 6) Improve lab analysis conditions.

14. 3 Environmental management plan (1) Environmental Protection Management System SGIS implements an environmental protection management system which is “fully responsible by the general manager with graded and centralized management and individual responsibilities”. The general manager is fully responsible for the company’s environmental protection.Governing leaders are responsible for the environmental protection within their respective governing area.Leaders in individual branch factories (departments) are responsible for the environmental protection within their respective managing area. The Safety & Environmental Protection Department (SE Dept. ), the functional department in the company responsible for environmental protection, implements and supervises all environmental protection activities in the company, supervises the implementation of environmental protection activities within the governing area of individual functional departments, as well as makes related management regulations. (2) Function Plan of Environmental Protection Management Organization 1) Environmental Protection Related Functions of SE Dept. Guided by the general manager and the governing deputy general manager, the environmental protection related managerial functions implemented by SE Dept.are as follows: a. Implement State and local environmental protection guidelines, policies and regulations, so that the

company’s production and development are synchronous with environmental protection in planning, implementation and development.

b. Coordinate with planning department for environmental protection plan.Specify general tasks, goals, standards and requirements of environmental protection related management provisions, as well as translate planned goals into detailed index which will be implemented in individual factories.

c. Organize and coordinate the implementation of individual departments’ environmental protection activities set in the plan, which are within their respective managing area .

d. Coordinate the rational resource & energy exploitation between individual branch factories and related management departments to reduce and prevent environmental pollution and damage, creating a benign cycle for the company’s reproduction.

e. Coordinate with propaganda, education and law departments for the propaganda and education of environmental protection related laws and knowledge.

f. Examine, supervise and assess the implementation of environmental protection goals set in the plan, and take measures to solve the problems found.

2) Functions of Environmental Protection Supervision Department Major responsibilities: Supervise the implementation of environmental protection plan set by individual factories or departments.Implement related State environmental protection regulations for construction projects for the factories’ new, expansion and rebuilding projects.Strictly implement the “Environmental Impact Statement” system and the “three synchrony” system which realizes synchronous design,



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construction and use of main projects and pollution and other public nuisance prevention projects, so that the pollutant discharge meets State and local standards or design requirements after the projects are completed. Collect pollutant discharge fee to pollutant discharging units.According to Internal Pollutant Discharge Fee Collecting Provisions of Guangdong SGIS Group (Interim), excess pollutant discharge fee will be collected to those who discharge pollutants in excess. 3) Functions of Environmental Protection Technology Department Major responsibilities: Make monitoring plans and proposals.Carry out and organize environmental impact assessment and pollution source investigation. Study, make and revise various measures and regulations regarding monitoring quality. Make quality control flowchart.Organize technical training and exchange activities to improve lab monitors’ technical skills.Monitor and assess the quality of lab apparatuses.Check quality control process and deal with accidents and appeal or arbitration from the quality control process. Maintain normal operation of lab apparatuses.Responsible for repair, replacement and development of lab apparatuses, and archives management.Make supply plan of lab apparatuses and consumable like reagent.Implement modern lab management. Make plans for technical development, introduction and reform of integrated control of environmental pollution. 4) Functions of Central Monitoring Station Complete routine and special monitoring tasks.Implement quality control as per lab quality control requirements.Maintain apparatuses used in the station.Keep the lab clean and tidy. Collect and process lab data, submit reports and print documents, and manage environmental science technical data archives. 5) Functions of Environment Engineering Control Center Responsible for the development, introduction and reform of integrated control of environmental pollution technology and pollution source control technology.Make plans of and implement integrated control of environmental engineering program.Effectively carry out environmental management and supervision to reach the goal of reducing total volume of pollutants discharge. (4) Methods of Environment Management According to Environmental Protection Law of the People’s Republic of China and related regulations, SGIS implements a sound environment supervision management with eleven internal regulations issued, which are Provisions of Environmental Protection, Responsibility System of Environmental Protection, Management of Environmental Protection Facilities, Management of Pollution Prevention and Treatment Coordination of Environmental Protection Supervision, Economic Responsibility System of Reaching Environmental Protection Goals, Implementation of Interim Provisions of Integrated Resource Exploitation, Implementation of Environmental Protection Management of Construction Projects, Management of Environment Pollution and Malicious Events (Trial), Clean Factory Management of SGIS (Trial),and Internal Pollutant Discharge Fee Collecting Provisions of Guangdong SGIS Group (Interim).All these have fundamentally standardized the environment management methods, as well as people’s behavior in environmental protection.

14. 4 Suggestions on Strengthening Environment Management Current problems in SGIS’s environment management system.The current SGIS’s environment monitoring management system is capable of carrying out basic routine monitoring tasks as per State Environmental Protection Administration’s related regulations and the Implementing Rules of Steel Industry Environment Monitoring, and supervising environment management according to State Environmental Protection Law and SGIS’s environmental protection regulations and factory regulations. But, with the increased range of new expansion projects and increased monitoring projects and contents in SGIS, the prior environmental monitoring system can not meet the requirements of continuous expansion, so the assessment shall be taken for prior environmental monitoring system to establish the new plan for environmental management. Major problems in existing environment monitoring system and environment management system: a. The general equipment level of environment monitoring apparatuses is lower than that of other

domestic backbone enterprises. b. Outdated mobile monitoring equipment and lacking of vehicles result in low emergency dispatch

ability in environment monitoring. c. Low qualification of monitoring & maintenance staff and low configuration of apparatuses &



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equipment restrict the further development of environment monitoring and management. d. Complicated coordination among different environment supervision and management departments

makes uniform and high-efficient environment supervision and management difficult. (2) Suggestions on Future Strengthening of Environment Management a. Restructuring of Functional Departments Transform the former general department and environmental protection department into plan & dispatch department and environmental protection technology department.Add environment supervision department and environment engineering control center. The Environmental Monitoring Department takes charge of environmental monitoring and management; the Environmental Engineering Control Center is mainly in charge of the development, introduction and improvement of environmental pollution comprehensive control technology and pollution source control technology, and the formulation and application of environmental engineering comprehensive control plan; the Environmental Protection Technology Department takes charge of environmental protection technology development, environmental protection instrument development and quality control; the Central Monitoring Station, being set with data process center, is mainly in charge of monitoring data process and statistics, report submission and paper printing, environmental scientific and technical documentation and management etc. ; the other functional departments of Central Monitoring Station will be restructured as follows: the Comprehensive Sector is canceled and the Monitoring Quality Management Section is set up to be in charge of monitoring technology and monitoring quality management of environmental monitoring, and the function of quality control of prior Comprehensive Sector will be taken by the coordination between Monitoring Quality Management Section and Environmental Protection Technology Department.The Air Monitoring Room, Water Quality Monitoring Room and Environmental Noise Lab are set up, and the functions will be kept consistent with prior setup. b. Personnel Assignment of Environment Monitoring and Management Staff Staff at the Environment Monitoring Station: 4 for atmospheric monitoring, 3 for water quality monitoring, 2 for noise monitoring, 5 for pollution source monitoring,1 for monitoring quality management, 1 computer professional for data processing, and 3 for others; Environmental Protection Supervision Department: 1 for environment supervision, 1 for environment management, and 1 for others; 2 for environmental protection technology development, 1 for environmental protection apparatus development, 1 for quality control, and 1 for others; Environment Engineering Control Center: 2 for environment engineering, and 1 for others. c. Strengthening the Building of Environment Monitoring Station Replace apparatus and equipment that can no longer satisfy the needs of quality control with new ones according to the above mentioned requirements. d. Suggestions on Strengthening Environment Supervision Guided by the general manager, the SE Dept.is responsible for carrying out overall environment supervision. Establish position based responsibility system and environment supervision system, and supervise their implementation. Establish an environment monitoring management system with the director of SE Dept.as the responsibility taker. The director of SE Dept.is responsible for the environment monitoring quality and technology, as well as for reaching the factory’s total pollutant discharge volume control goal. The stationmaster of the monitoring station is responsible for environment monitoring technology and quality. Actively involve in the propaganda and education of environmental protection laws, policies and regulations to increase people’s environmental protection awareness. Actively involve in the development, introduction and reform of integrated control of environmental pollution technology and pollution source control technology to reduce pollution sources and discharge volume, so that the total pollutant discharge volume can reach the control goal. (3) Suggestions on Strengthening Environment Monitoring



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Suggestions are made according to the characteristics of the project: To implement monitoring once a month in Shanzibei Village near the tank region.The CO concentration shall be dynamically monitored to ensure the physical health of people there.



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15 Assessment Conclusions and Recommendations

SGIS plans to build a Gas Tank Project.The recycled energy deducting the operationally consumed energy, after being put into operation, shall reach a total of standard coal 1. 8316 million t/a. According to Development Policies on Steel Industry and Guidance Directory for Adjustment of Industrial Structures (2005 edition), the project belongs to the Type - Encouraged. 。

15. 1 Project overview The Gas Tank Project lies in the north of the SGIS production area, of which the Meihua River after diversion is in the north, the existing Gas Tank area in the west, electric blast station for 6 # blast furnace in the south, farm and rearing pond in the east, with a total area of 72,600 m2, the green land ratio counts for 25%, and the afforesting area is about 18,200 m3. The main facilities include one 300,000m3 blast furnace gas tank, two 80,000m3 converter gas tanks, one 100,000m3 coke oven gas tank for industrial use and one 30,000m3 coke oven gas tank for civil use, as well as gas purification and pressurization system and wastewater collection sump.Auxiliary facilities include converter gas electric dedusting equipment, gas mixing station, coke oven gas pressurization station, mixed gas pressurization station etc. Production wastewater of the Project is mainly collected by collection sump in the tank area and sent to phenol wastewater treatment field in Coking Plant or sewage treatment field of No. 3 Steel Plant for recycling instead of discharging. The total investment of this Project is 354,420,000 Yuan, of which 1,127,200 Yuan will directly be used on the environment protection, occupying 0. 33％ of the total investment.

After completion of the new gas tank, one old 100,000m3 blast furnace gas tank, one 20,000m3 coke oven gas tank for civil use and one coke oven gas pressurization station will be out of service.

15. 2 Engineering Analysis

15. 2. 1 Requirements for raw materials The blast furnace gas (~9. 5kPa, 200000Nm3/h) and the coke oven gas (~6kPa 80000Nm3/h) from the gas main pipe of the tank area shall, based on the flow proportion and heating value feedback, be mixed together to form gas mixture from blast furnace and coke oven (~4kPa,280000Nm3/h, 7527kJ/Nm3), and then delivered to the mixed gas pressurization station to has its pressure increased to 18kPa. The pressurized gas mixture from blast furnace and coke oven shall, based on the flow proportion and heating value feedback, be mixed together with the converter gas (~19kPa, 40000~75000Nm3/h, 7527kJ/Nm3) to form the gas mixture from blast furnace, coke oven and converter, and then supplied to the whole mixed gas users of the plant. Of different gases, the CO concentration is relevantly higher in blast furnace gas (26. 3%) and in converter gas (67. 5%).CDQ gas is mainly H2 (58. 2%), with water being saturated. After purification, such impurities as naphthalene, cyanide and sulfide in the gases have basically been shed. The supplemented water is 627071.25 m3/a, the total water amount for the project water circulation system is 340 m3/h (2978400 m3/a), circulating water amount is 334. 9 m3/h, the new supplemented water is 5. 1 m3/h, and the recycling rate is 98. 5 %.

15. 2. 2 Pollutant Discharge 15. 2. 2. 1 Air pollutant (1) Organized emission Base on The Approval Report of the New Gas Tank Area Project of the Shanguan Iron & Steel Group



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Limited Company of Guangdong Province by the Central Environmental Monitoring Station of Guangdong Province, we can know that: The blast furnace gas tank, industrial coke oven gas tank, civil coke oven gas tank and converter gas tank in the project do not emit waste gas under normal conditions.Only when there is gas leakage under abnormal conditions will gas be emitted via safe gas release pipe. Therefore, under normal conditions, there is no organized emission of waste gas from the project. (2) Fugitive emission As the POC dry gas tank in the project is designed to use sealing oil and the Wiggins gas tank to use rubber sealing ring, the piston is adjusted with the change of the gas volume.Thus there is no fugitive emission of waste gas from the gas tank body under normal working conditions. When gas comes in/out the tank via pipes/valves, fugitive emission of gas occurs at the pipe fittings and valves/when the pressuring machine is pressuring/when the gas mixing system is mixing gas. Survey of gas tanks in operation in SGIS as well as their throughput. The fugitive emission of gas from this project is 4.426kg/h, with a total amount of 38.772t/a. (3) Abnormal working conditions In case that the gas tank is abnormal or is under maintenance, there is a small amount of gas diffusing from the safe dispersing pipes at the top of gas tank. According to relevant files of SGIS, the gas is discharged once every six years with approximately 8.326 t/a, and the discharge duration of each time is about 30min.

15. 2. 2. 2 Water pollutants The wastewater generation volume is 602323.7m3/a, including:clean sewage of 25310m3/a, which is directly collected by the SGIS clean sewage system for recycling; and dusty wastewater of 525600 m3/a, which is collected and treated by the wastewater treatment station in No. 3 Steel Plant and treated for recycling in the turbid circulating waster system. Wastewater collected by the wastewater treatment plant of the coking plant is 51413.67 m3/a , including oily wastewater of 6307.2 m3/a, phenol containing wastewater of 36360.1 m3/a, naphthalene containing wastewater of 480m3/a, domestic wastewater of 6816.375 m3/a and initial rainwater (with oil) of 1450 m3/a, which is collected and treated by the phenol/cyanogens wastewater treatment station in the coking plant for recycling as the washing water for blast furnace residues. Wastewater in this project realizes zero discharge and no wastewater is discharged outside.

15. 2. 3 Solid Waste (1) Industrial solis wastes Adsorbent S1 changed in the industrial coke oven gas purification station is approximately 140t/time (changed one time in two years), including 50t/a of desulfurating agent, which is transferred to the coking plant for recycle, and approximately 90t/a of porcelain fills, CAN-110 and CAN-229, which is recycled by the manufacturer and not discharged outside. Adsorbent S1 changed in the civil coke oven gas purification station is approximately 75t/time (changed one time in two years), including 30t/a of desulfurating agent, which is transferred to the coking plant for recycle, and approximately 45t/a of porcelain fills, CAN-110 and CAN-229, which is recycled by the manufacturer and not discharged outside. (2) Domestic wastes The personnel quota in the tank area is 83, and the domestic waste produced amounts to 1. 6t/a. No environmental impact issues are generated from solid wastes in this project.

15. 2. 4 Noise The main noises generated in the gas tank area include mechanical noise and aerodynamic noise and the main noise sources are pressuring machines, dedusting fans, pumps and release devices of safety valves on tank release pipes.The strength of main noise sources without any noise control measures under normal conditions are more than 85dB(A), please refer to Table 3. 4-5.

15. 2. 3 Prevention and treatment measures for pollution



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15. 2. 3. 1 Prevention and treatment measures for water pollution In the tank area, sewerage catchments for collection of phenol containing wastewater, oily wastewater and dusty wastewater are established. After collection, the phenol containing wastewater of approx.50933. 68m3/a drains into the wastewater with cyanide phenol in coking plant, and is treated and qualified as make-up water for slag flushing water in the blast furnace, and is not drained outside. The dusty wastewater, about 525600m3/a, drains into the wastewater treatment plant of No. 3 Steel Plant, and is treated and qualified for recycling. The capacity of the Phenol-Cyanogen Wastewater Treatment Station is 2000m3/d, and a new Phenol-Cyanogen Wastewater Treatment Station with capacity of 2400m3/d will be built to meet the demand of 6m coke oven. The total amount of wastewater produced in #4 and #5 coke ovenss is 720m3/d, and the phenol-cyanogen wastewater produced in the 6m coke oven is expected to be 1008m3/d.The excessive capacity of the wastewater treatment station is 2400m3/d, while the wastewater discharged into the wastewater treatment plant in the coking plant from the tank area is 50933. 68t/a, i. e.appropriate 140t/d.Therefore, the wastewater treatment plant can treat the wastewater produced in the tank area. A2/O biological denitrogenation process is adopted for the wastewater treatment facilities. The wastewater after treatment could be up to Class standard of DB44/26-2001.

15. 2. 3. 2 Treatment measures for solid waste Industrial solid wastes generated from the project are recycled and not discharged outside. Domestic wastes from the staff in tank area are treated by the local sanitation sector.

15. 2. 3. 3 Noise treatment facilities For equipment type selection, various types of ventilators and pumps shall be selected low-noise products as much as possible. Individual foundations or vibration damping measures are established for the dust removal ventilators and pumps, and flexible connection modes are adopted among strong vibration equipment and pipelines to prevent the noise producing from vibration spreading outward. The acoustical treatments shall be carried out on the circulating fan, circulating air pipe, etc. The rational deployment is conducted utilizing factors of terrain, plant house, and direction of noise sources as well as noise absorbing function of afforesting plants when the general layout is carried out; the role of comprehensive treatment is fully taken account to management to reduce noise pollution. After the measures above are applied, the day and night noise values of factory boundary are predicted to be able to comply with the standard values class III of Standard for Noise at Boundary of Industrial Enterprises (GB12348-90).

15. 2. 4 Health Protection Zone The health protection distance of 6m Coking Plant may be taken as 200 meters according to calculation basing on GB/T13201-91The project is located within SGIS plant, without any sensitive point within the range of 200m around, which meets this requirement. The distances of the nearest sensitive points to the gas tank all meet the requirement for such health protection distance.

15. 3 Existing Baseline of the Environment (1) Existing baseline of ambient air In conclusion, in the assessment area, the 1# plant site complies with the Class III assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000), and the other monitoring locations all comply with the Class II assessment standard of Ambient Air Quality Standard (GB3095-96, revised in January 2000). In the assessment area, concentrations of NO2, SO2 and CO at all monitoring locations are lower than that of relevant standards regulated in the Ambient Air Quality Standard (GB3095-96, revised in January 2000). In the assessment area, the daily mean concentrations of PM10 and TSP are usually lower, and the concentration of particles in monitoring locations could comply with relevant assessment standard.



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Thereby, at present, the air quality of the assessment area is relevantly good, and can satisfy the corresponding functional requirements.

(2) Existing baseline of surface water environment All monitoring items but Fe and CODcr comply with the requirement of Class III standard of Environmental Quality Standard for Surface Water (GB3838-2002); Water quality is worsen for wastewater from SGIS in drainage section (2#), and monitoring items of CODcr, Pb, Zn, fluoride, T-P and Fe exceed the standard differently, and the water quality cannot meet the requirement of Class standard of Environmental Quality Standard for Surface Water (GB3838-2002); the section (3#) in front of the meeting of Meihua River and Maba River is farther from the outlets, but the water quality is not improved, which is resulted from that water from the upstream is in a less amount than that of discharged wastewater, especially the wastewater from Qujiang County and enterprises in downstream of Meihua River, which increases the pollutant quantity in river but with a weak dilution and degradation capacity, so degraded pollutants are less than the increased pollutants. Based on the monitoring result of the section (4#) in front of the meeting of Meihua River and Maba River, CODcr, Pb, T-P, BOD5, T-N and Fe in water from the upstream of Maba River all exceed the standard.Several items in section (5#) in front of the meeting of Beijaing River and Maba River exceed the standard. On the section before North River joins Maba River (5#), the monitored items of water quality all meet the requirements of Class IV standard of GB3838-2002 except iron; lightly polluted by iron; on the section after North River joins Maba River, all monitored items meet requirements of Class _ standard of GB3838-2002 except total nitrogen and iron. (3) Existing baseline of surface water environment Five groundwater monitoring points in the assessment all meet the requirement of Class III Standard of Environmental Quality Standard for Groundwater (GB/T14848-93),which indicates that the groundwater in the assessment area is in good condition.

(4) Existing baseline of the Environment The sensitive points being monitored in the project include Dayuantou Village, Shanzibei School, Xiaojiang Village and Laojiang Village.Class Standard of Ambient Noise Standard for Urban Area (GB3093-93) shall be executed with the exception of Laojiang Village, which is within the 300 m range of the plant boundary.As can be seen from the table, during daytime, all monitoring points meet relevant standard requirements; during night all monitoring points exceed the standard, among which the most serious one is in Shanzibei school, the maximum monitored value of which is 13.4 dB above the standard value. The plant boundary area belongs to industrial area, for which the Class III standard of Measuring Method of Environmental Noise of Urban Area (GB 3093-93) shall be executed. As learned from the monitoring result, during daytime, the noise level at all monitoring points meets the Class III standard of Measuring Method of Environmental Noise of Urban Area (GB 3093-93); during night, SGIS boundary reaches Class III standard. Boundary of gas tank area execute Class III standard of Ambient Noise Standard for Urban Area GB3093-93. The monitoring results show that noise level in daytime at all the monitoring points meets the standard. To sum up, acoustic environment of gas tank area meets Class III standard because the area around it are no construction.But in consideration of the future development of SGIS, it is suggested that relevant noise control measures still need to be taken. (5) Existing baseline of soil environment Monitoring on 1# rice soil of New Xiaojiang Village, 2# vegetable soil in New Xiaojiang Village, 3# vegetable soil in Songshanxia Village, 4# rice soil in Old Xiaojiang Village and 5# rice soil in upstream of Meihua River in this assessment, following the class II standard of Environmental Quality Standard for Soils (GB15618-95). Based on the above assessment results， cadmium at all the monitoring points exceeds the standard at 4. 5~7. 7 times; Mercury exceeds the standard in topsoil and subsoil at 1#, 3#, 4# and 5# monitoring points, and copper in topsoil at 3# monitoring point.

(6) Investigation and assessment of farm crop



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Three sampling points for farm crop are arranged in the assessment area. Samples are harvested crops in this area (vegetables, potatoes and coarse rice). Analysis items include Cu, Pb, Zn, Ca, Hg and As. Compared with relevant standards in National Hygienic Standards of Grains (GB2715-81), the investigation and analysis result of crops show that the As in crops is lower that the national standard, but Ca in 5# vegetables in upstream of Meihua River exceeds the standard.All crop samples are colory and with pure smell.In the assessment area, all farm crops are not polluted with heavy metals except that the 5# vegetables in upstream of Meihua River are polluted with Ca.

15. 4 Environmental Impact Prediction 15. 4. 1 Assessment of atmospheric effect We may simulate to forecast the gas tanks’ effect on the atmospheric environment in abnormal working conditions.The forecasting considers the following two situations: Simulate the worst situation of gas tanks in the abnormal situation.When all tanks are dispersing synchronously, how about the dispersed CO’s influence on the surrounding air? The worst situation of a single tank in the abnormal situation, how the converter gas tank, which disperses CO most, influences the surrounding atmospheric environment?

(1) All tanks disperse synchronously If all gas tanks discharge simultaneously, CO concentration in ambient environment will be increased rapidly. Impact value of average ground concentration of CO on each sensitive point increase obviously, the concentration values account for 182. 44~5. 27% of Class Ⅱ standard of ambient air quality, and account

for 214. 74~6. 57% of Class Ⅱ standard of ambient air quality after being added with the existing baseline values. All CO concentration values in Old Xiaojiang Village, Taiping Village, Liantang Village and Shanzibei exceed the Class Ⅱ standard value of 10mg/m3 (average value of an hour) specified in Ambient Air Quality Standard (GB3095-1996). The farthest estimated scope with over-standard values in various meteorological conditions is located within the range of about 3200m downward of the gas tanks in case of D 1. 5m/s. All CO concentration values of sensitive points exceed the value 3. 00mg/m3 (the value measured each time) specified in Maximum Allowable Concentration of Hazardous Substances in Atmosphere of Residential Areas (TJ36-79), but none of the values is higher than the limit values specified by Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002) and are far lower than the acute toxicity standard value, thus it will not cause casualty. Hence, if all gas tanks discharge simultaneously in abnormal working conditions, it will make not only obvious impact on the sensitive points but also significantly adverse impact on the ambient environment.

(2) Single converter gas tank disperses According to Table 6. 1-12, if a converter gas tank discharges in abnormal working conditions, CO concentration in ambient environment of this project will increase to some extent, impact value of average ground concentration of CO on each sensitive point increase obviously, the concentration values account for 66. 64%~2. 17% of Class Ⅱ standard of ambient air quality, and 98. 94~13. 7% of Class Ⅱ standard of ambient air quality after added with the existing baseline values. None of the values exceeds the Class Ⅱ standard 10mg/m3 (average value in an hour) of CO specified in Ambient Air Quality Standard (GB3095-1996). The farthest estimated scope with over-standard values in various meteorological conditions is located within the range of about 50m downward of the gas tanks in case of B 0. 5m/s.

Hence, all CO concentration values of the sensitive points are consistent with the Class Ⅱ standard value of 10mg/m3 regulated by Ambient Air Quality Standard (GB3095-1996). According to Table 6. 1-11, if one converter gas tank discharges, only CO concentration values in Laoxiaojiang and Shanzibei exceed the value of 3. 00mg/m3 (the value measured each time) regulated in Maximum Allowable Concentration of Hazardous Substances in Atmosphere of Residential Areas (TJ36-79), but none of the values is higher than the limit values regulated by Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002) and the values are far lower than the acute toxicity standard value.Thus, the CO discharged



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in this condition makes little impact on health of the residents and the concentration values are admissible. Hence, if a converter gas tank discharges in abnormal working conditions, it will make certain impact on the sensitive points, but the CO concentration value will not exceed the Class Ⅱ standard value of 10mg/m3 (average value of an hour) regulated by Ambient Air Quality Standard (GB3095-1996) and will not make obvious adverse impact on the ambient environment. So, that the situations in which all the tanks disperse synchronously should be avoided.Management and maintenances shall be improved, to ensure that only 1-2 tanks disperse abnormally every time.

15. 4. 2 Water environment impact assessment Water conservation is considered in design of this project and relevant measures have been taken, e. g.recycling based on quality, discharging the circulating water into clean sewage system for recycling, treating all the phenolic wastewater, oily wastewater and dusty wastewater for recycling. Electrostatic precipitators of converter require continuous water supply of 60m3/h during the process.All the drainage can be collected temporarily by the water gather tank in gas tank area for treating instead of being discharging into the Meihua River. “Zero discharge” of industrial wastewater is realized for this project.Major domestic wastewater can be recycled after being treated instead of being discharged.Hence, this project will not impact the environment water environment. In addition, SGIS is preparing to construct a wastewater treatment plant and the environmental impact assessment is in progress.After completion of the wastewater treatment plant, all the wastewater from the plant will be discharged after being treated in the wastewater treatment plant.Then, the pollution problem caused by direct drainage of domestic wastewater will be solved and the water quality of the Meihua River, the Maba River and the Beijiang River at the lower reach of discharge outlet will be improved obviously. Therefore, the wastewater generated by gas tanks has minor impact on the ambient environment.

15.4.3 Water environment impact assessment The boundary standard of the project shall comply with the specifications of Standard of Noise at Boundary of Industrial Enterprises (GB12348-90), that is to say, 65dB(A)in daytime and 55dB(A) in nighttime. According to Table 6. 3-3a and Table 6. 3-3b, after this project is put into operation, the impact of noise is relatively large at night before noise control measures are taken, while estimation values of all monitoring sites together with background values are consistent with X standard after control measures proposed in engineering analysis re taken.Hence, there will be no impact on the acoustic environment.

15.4.4 Solid waste impact analysis There will be no solid wastes generated during operation of this project, thus it will not make impact on the ambient environment. Domestic garbage of staff is disposed by local environmental sanitation administrative department.

15.4.5 Environmental risk assessment The storage and leakage capacities of blast furnace gas tank are maximum with lower emission height, which may affect the surroundings much more, so there is needs to only forecast the accident state of blast furnace gas tank; hydrogen, with a wider explosion scope of 4. 1-74. 2%, will easily cause fire and explosion even in the open conditions, so there is also a need to forecast the fire accidents caused by gas leakage of industrial coking oven.

(1) Fire explosion When gas tanks of industrial coking oven leak for 10min, 1052.45kg hydrogen of the leakage gases will form vapor clouds, of which the main component H2, (hydrogen) may cause fire and explosion when triggered by fire source. The damages include: 25.3 m of death radius, 62.3 m of burn radius (degree app:atomic absorption spectrophotometer), and properties of the field within about 55 m get damaged. Therefore, once there is any leakage from the gas tank, the fire and explosion accident could happen when there is any fire source with possible deadly hazards to the people within about 30m. Its injury radius could reach about 80m, which could have impacts on other gas tanks to some extent. Therefore, the people within 150m should be evacuated except the professional firemen. Water fog should



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be immediately sprayed over the gas leakage for dilution and absorption. The cooling treatment should be implemented for other surrounding gas tanks. The nearest environmental sensitive point for the project is Shanzibei Village, which will not be directly impacted.

(2) CO leakage To sum up, when there is any CO leakage accident, the worst meteorologic conditions will have certain impacts on the health of people within 1000m. The concentration might be higher than the limit value regulated in Occupational Exposure Limit for Hazardous Agents in the Workplace (GBZ2-2002) but without any consequent injury. And the duration is relatively short, which will normally dissipate within 15~20min. Therefore, the drill should be well carried out at peacetime. The prevention drill should be actively organized for the residents at the environmentally sensitive points within around 1000m such as Liantang Village, Shanzibei and Laozijiang. Once there is any leakage accident, to protect the public health, the residents at the three points shall be immediately evacuated. Based on gas leakage accident results and preventive measures accumulated for each year in the past, the assessment considers the environmental risk of this project is in the acceptable scope. 15.5 Cleaner production and mass loading control (1) Cleaner production By adopting engineering design, the project is capable of reusing circulating water by a rate of 98.5%, greatly improving the situation with generated pollutants and emissions compared to wet gas tank. Production wastewater is fully reused, and its emission is basically zero; as to air pollutants, the emissions are low and of mainly unorganized emissions. To sum up, through a cleaner production analysis on this project, the new dry gas tank (POC), and the Wiggins gas tank are at an advanced level domestically. It is recommended by this assessment to establish strict internal management rules and regulations, implement safe production guidance, make job training, execute post responsibility system, carry out cleaner production auditing as soon as possible, strengthen quality management, improve environmental management level, decrease pollutant discharge and increase the level of cleaner production further. (2) Mass loading control The blast furnace gas tank, industrial coke oven gas tank, civil coke oven gas tank and converter gas tank in the project do not emit waste gas under normal conditions. Only when there is gas leakage under abnormal conditions will gas be emitted via safe gas release pipe. The main composition of coal gas is CO, the emission of which in the gas tank area, when put into operation, is about 147.226t/a. Due to the absence of the corresponding total control index, in this assessment, there does not exist a total amount of air pollutants for the gas tank project. There will be zero wastewater discharge in the tank area after being put into operation, so the assessment considers that no total amount shall be applied for the gas tank area on water pollutants. 15.6 Industrial Policies Analysis and Rationality Analysis of Site Selection 15.6.1 Compliance with Industrial Policies The construction of the gas tank area is for the collection of blast furnace gas, coking oven gas and converter gas, and then is supplied consumers. Referring to the Code 40 Guidance Directory for Adjustment of Industrial Structures (National Development and Reform Commission, Fa Gai Wei Order No. 40) , it belongs to the –encouraged-type project. The construction of the gas tank area effectively enables the collection of gases from blast furnace, converter and coke oven, reduces gas dissipation and provides high-quality energy source for industrial and commercial use. This project is an example of comprehensive recovery and utilization of gases, in line with the policy objectives set in Development Policies for the Iron and Steel Industry. Comply with relevant requirements of the General Plan of Guangdong Provincial Environmental Protection (2006-2020). 15.6.2 Reasonable site selection The project site selection is consistent with the SISG land planning. The building layout and fire spacing

meet relevant regulations in Code for Fire Protection Design of Buildings (GB 50016－2006), Code for



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Design of Urban and Rural Gas Supply (GB 50028－2006) and Design Code for General Layout and

Transportation in Metallurgical Enterprise (YBJ 52－88). The distance for fire protection between gas tank and peripheral buildings shall satisfy relevant specifications in Code for Design of City Gas Engineering (GB 50028-2006). Flood control requirements of Meihua River and connection with the peripheral roads are taken into account on building layout and design. Earthquake-proof intensity is degree of six. 15.7 Public participation According to requirements of the Regulation for Public Participation in the Environmental Impact Assessment (Huan Fa 006 [No. 28]) and the Implementation opinion for public participation in environmental management of construction projects in Guangdong Province (Yue Huan [2007] No.99), three stages of public participation for this project have been conducted. Total 100 questionnaires were sent out in this investigation, and actually 97 valid questionnaires were recovered, of which effective recovery rate was 97%. According to the statistical result of the public participation survey form issued, generally, 64.9% of the respondents expressed support of the Project,, 27.8% of the respondents said it does not matter one way or another, 7.2% of the respondents clearly expressed opposition due to concerns over air, water pollution, traffic inconvenience and economic losses during construction of the Project. People who raise objections mostly are villagers of the surrounding area, and they do not have enough confidence on the Project, and are worried that the project may cause gas leakage affecting the health of neighboring residents. But after further communication as well as the commitments made by the owner, the people who opposed the Project are able to understand and support the implementation of the Project and its construction. So, if the Unit of the Project take measures on the “3 wastes” treatment in accordance with the requirements of environmental protection, meet emission standards, strictly implement the various management measures and safety precautions proposed by the EIA report, and reduce the impact on the life of the residents and on the environment following the completion of the Project, the majority of the public support the construction of the Project.

In conclusion, the proposed project complies with relevant national and local industrial policies; complies with the requirement of cleaner production and circulation economic; not changes the environmental function zone of the assessment areas in operation; the environmental risk is lower than that of the mean level of this industry and the public holds a supportive attitude to the project construction.

Based on the preconditions of that the construction party complies with the “three simultaneities” requirement of environmental protection, ensures the normal operation of environmental protection treatment facilities strictly, paies great attention to the environmental risk prevention and strictly implements relevant environmental protection measures proposed in this report, the construction of the proposed project is feasible in environmental protection.



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Appendix: 1. Shao Huan Han [2008] No.122, Letter on Opinions for Examination and Approval of Environmental

Impact Report of Gas Tank Engineering Construction Project of Guangdong SGIS Songshan Co., Ltd.;

2. Public notice of environmental evaluation results of this project; 3. Letter of attorney of the project; 4. Illustration on the nature of land used in the project.