potential grey water quantification in newton residence...
TRANSCRIPT
FOREWORD
The 1st Young Scientist International Conference of Water Resources Development
and Environmental Protection 2015 (ICWRDEP 2015) Water Resources Engineering
Department, Faculty of Engineering, University of Brawijaya was conducted on 5 - 7 June
2015. The Conference was organized by Faculty of Engineering and collaborated with
International University of Malaya (UM), Universiti Sains Malaysia (USM) and Universiti
Tun Hussein Onn Malaysia (UTHM).
The participants of the Conference are about 60 participants come from more than 20
higher institutions, such as; Sepuluh Nopember Institute Of Technology, Surabaya (ITS),
Bandung Institute of Technology (ITB), Bogor Agricultural University (IPB), The University
of Lampung, Sriwijaya University, University of Muhammadiyah Malang (UMM),
University of Brawijaya (UB), Padjajaran University, State University of Malang (UM),
National Institute of Technology (ITENAS), Tidar university, State Polytechnic of Malang
(Politeknik Negeri Malang), Mulawarman University, State Polytechnic of Padang
(Politeknik Negeri Padang), Malang National Technology Institute (Institut Teknologi
Nasional Malang), BBWS Mesuji Sekampung, Bengkulu University, Diponegoro University
(UNDIP), Nusa Cendana University, Khairun University, Bantara University, University of
Jember, State Polytechnic of Samarinda (Politeknik Negeri Samarinda), UM (University of
Malaya), Universiti Sains Malaysia (USM) and Universiti Tun Hussein Onn Malaysia
(UTHM), and others, which reflect the importance water resources engineering development
and environmental protection.
The topics of conference are Environmental Engineering & Water Technology,
Integrated Water System & Governance and Water Science & Engineering. The conference
provide platform for researchers, engineers and academician to meet and share ideas,
achievement as well as experiences through the presentation of papers and discussion. These
events are important to promote and encourage the application of new concept of water
resources development and techniques to practitioners as well as enhancing the knowledge of
environmental protection with the current requirements of analysis, design and construction
of any engineering concept.
As Head of Water Resources Engineering Department, we would like to express our
deepest gratitude to the Rector University of Brawijaya, Keynote Speakers (Prof Satoru Oishi
& Prof Tsuyoshi Imai from Japan, Assoc. Prof Faridah Othman and Prof Amir Hamzah from
Malaysia), International Advisory Board members, organizing committee and also to all
participants.
We would like to express our deepest gratitude to the Faculty of Engineering
conducted such conference. This is the first International conference for the Department and
we expect that this is will become 2nd annual activity for our Department.
Malang, 5 June 2015
Ir. Mohammad Sholichin, MT., Ph.D
Head of Water Resources Engineering Department
Faculty of Engineering University of Brawijaya
Editorial Boards
Dr. Ery Suhartanto, ST.,MT. (University of Brawijaya)
Dr.Ir. Pitojo Tri Juwono, MT. (University of Brawijaya)
Anggara WWS, ST.,M.Tech. (University of Brawijaya)
Dr.Ir. Ussy Andawayanti, MS. (University of Brawijaya)
Fahmi Hidayat, ST.,MT. (Perum Jasa Tirta 1)
Gatot Eko Susilo, ST.,M.Eng.Env.,Ph.D (The University of Lampung)
Editorial Reviewers
Prof. Dr. Ir. Mohammad Bisri, MS. (University of Brawijaya)
Prof. Ir. Dr. Amir Hashim bin Mohd Kassim (UniversitiTun Hussein Onn Malaysia)
Prof. Tsuyoshi Imai (Yamaguchi University, Japan)
Prof. Dr. Ir. Suhardjono, M.Pd.Dipl.HE (University of Brawijaya)
Prof. Satoru Oishi (Kobe University, Japan)
Prof. Dr. Nor Azazi Zakaria (Universiti Sains Malaysia)
Dr.Ir. Rispiningtati, M.Eng. (University of Brawijaya)
Ir. Moh. Sholichin, MT.,Ph.D (University of Brawijaya)
Prof. Dr. Ir. Nadjaji Anwar, M.Sc (Sepuluh November Institute of Technology)
Ir. Dantje Kardana N, M.Sc.,Ph.D (Bandung Institute of Technology)
Dr.Eng. Tri Budi Prayogo, ST.,MT. (University of Brawijaya)
Dian Sisinggih,ST.,MT.,Ph.D (University of Brawijaya)
Ir. Abubakar Alwi, Ph.D (University of Tanjung Pura)
Dr. Eng. Andre Primantyo Hendrawan, ST.,MT. (University of Brawijaya)
Assoc. Prof. Dr. Faridahbinti Othman (Universiti Malaya)
Dr. Ir. Widandi Soetopo, M.Eng. (University of Brawijaya)
Dr. Eng. Donny Harisuseno, ST.,MT. (University of Brawijaya)
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Table of Content
Page
Foreword............................................................................................................................... i
Editorial Boards ..................................................................................................................iii
Editorial Reviewers .............................................................................................................iii
THEME 1 Environmental Engineering & Water Technology
Circulation Effect Of Coffee Wastewater Flow In Water Hyacinth
Phytoremediation ........................................................................................................... A-1
Elida Novita, Sri Wahyuningsih, Siswoyo Soekarno, Betty Siska Rukmawati
Potential Greywater Quantification For Reuse In Newton Residence Apartment
Bandung, Indonesia........................................................................................................ A-8
Dyah Asri Handayani Taroepratjeka, Yulianti Pratama, Devi Ayu Putrianti
Analyzing Water Quality Changes Due To Agriculture Activities In Seputih
Irrigation Area, Lampung Province, Indonesia .......................................................... A-15
Eka Desmawati, Rusdi Effendi, Yudha Mediawan, Gatot E. Susilo
Evaluation of Environmentally Friendly Flushing in Wlingi and Lodoyo
Reservoirs ..................................................................................................................... A-23
Fahmi Hidayat
Dynamic of Dissolved Oxygen At Inlet Zone Of Fish Cage Area In Cirata Reservoir,
West Java, Indonesia.................................................................................................... A-30
Fanny Novia, Priana Sudjono, Arief Sudrajat
Intensive Agriculture of Peat Land Areas To Reduce Carbon Emission And Fire
Prevention (A Case Study In Tanjung Jabung Timur Tidal Lowland Reclamation
Jambi) ........................................................................................................................... A-38
Momon Sodik Imanudin1, and R.H Susanto
The 1st Young Scientist International Conference of Water Resources Development and
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Mikro-Nano Activated Charcoal from Ricestraw as Adsorben Heavy Metals Leachate,
Case Studies on “TPA JATIBARANG”, Semarang Jawa Tengah ............................ A-49
Rizki Januarita, Anis Ulfa W.A, Azka Azizah, Hilma Muthi’ah
Determination of Water Quality Status at Karang Mumus River Samarinda,
Indonesia ...................................................................................................................... A-59
Sri lestari, Diana Arfiati, Aniek Masrevaniah, Moch. Sholichin
Efficiency Analysis of Cod And Bod Decline Wastewater Coffee On Phytoremediation
Process Using Water Hyacinth (Eichornia Crassipes (Mart.) Solms) ........................ A-62
Setyorini, Sri Wahyuningsih, Elida Novita
Green Roof: Vegetation Response towards Lead and Potassium............................... A-69
Khairul Rahmah Ayub, Aminuddin AB Ghani, Nor Azazi Zakaria
Water Content – Density Criteria of Bentonite – Fly Ash Mixtures for Compacted Soil
Liners ......................................................................................................................... A-77
Andre Primantyo Hendrawan, Dian Chandrasasi1, Runi Asmaranto, Anggara Wiyono Wit Saputra, Linda
Irnawati Gunawan, Zaenal Abidin
THEME 2 Integrated Water Systems & Governance
Experience in Rainwater Harvesting Application For Household Scale In Bandar
Lampung, Indonesia ...................................................................................................... B-1
Gatot Eko Susilo
Estimation of the Flood Using Data Modis to Support Integrated Water Resources
Management ................................................................................................................... B-9
Gusta Gunawan, Alex Surapati, Besperi
Alternative Selection for Water Resource Potential in Brantas Watershed
For The Development of Hydroelectric Power Plant .................................................. B-16
Deviany Kartika, Miftahul Arifin
Analysis Availability on the Clean Water Infrastructure at PDAM Ternate ............ B-23
Nani Nagu
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Rainfall Estimation Using Weather Radar and the Flood Simulation at Ciliwung
River Indonesia Analysis ............................................................................................. B-30
Ratih Indri Hapsari, Agus Suhardono, Reni Sulistyowati
Integrated Coastal Zone Management with Watershed Management Based On
Co-Management: A Case Study Porong River Along Sidoardjo-Pasuruan
Coastal Area ................................................................................................................. B-37
Rudianto
The Evaluation of Song Bajul Springs Potency For Resident’s Clean Water Supply
In Desa Pucanglaban Kecamatan Pucanglaban Kabupaten Tulungagung In
2015-2030 ...................................................................................................................... B-46
Sam Yudi Susilo, Hendra Agus
Flow Analysis On Pipe Distribution Network Using Differential Evolution Algorithm
(DE)............................................................................................................................... B-54
Sulianto
Hydroinformatics In Volumetric And Real Time Irrigation Discharge
Monitoring .................................................................................................................... B-63
Susi Hidayah, Aditya Prihantoko, and Irfan Sudono
Multiple Stacked Rule Curves For Reservoir Operation Of Medium Reservoir ...... B-71
Widandi Soetopo, Lily Montarcih Limantara, Suhardjono, Ussy Andawayanti, Rahmah Dara Lufira
Water Balance Analysis Due To the Human Live Requirements............................... B-76
Agus Suharyanto, Very Dermawan, Mustika Anggraeni, Pudyono , Kurniawan Sigit Wicaksono,
Diah Susilowati
Optimization System Network Providing Water Study Blitar District Of Kademangan
East Java Indonesia...................................................................................................... B-84
Rahmah Dara Lufira, Suwanto Marsudi, Jadfan Sidqi F., Evi Nur Cahya
Safety Inspection of Prijetan Dam ............................................................................... B-89
Runi Asmaranto
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Analysis of Conditions Changes In Sumi Dam Hydrology Parameters
Design ......................................................................................................................... B-100
Anggara WW. Saputra
THEME 3 Water Science & Engineering
Investigation of Marine Debris In Kuta Beach, Bali..................................................... C-1
Adli Attamimi, Noir P. Purba, Santi R.Anggraini, Syawaludin A. Harahap
Design of Marine Propulsion System Based On Structural Vibration......................... C-8
Asep Andi, Radite Praeko Agus Setiawan
Transmission and Wave Reflection on Double Submerged Breakwater ................... C-16
Bambang Surendro
Calibration of Measurement on Modelling Stepped Spillway .................................... C-24
Denik Sri Krisnayanti, Soehardjono, Moch.Sholichin, Very Dermawan, Nina B.Rustiati
Estimates of Time of Concentration in Rainfall, Runoff and Infiltration
Application ................................................................................................................... C-33
Dian Noorvy, Lily Montarcih, Donny Harisuseno
Comparing the Calculation Method of the Manning Roughness Coefficient in Open
Channels ....................................................................................................................... C-42
Hari Wibowo
Grouping Watersheds Through Hierarchical Clustering Approach ......................... C-53
Judi K. Nasjono, Mohammad Bisri, Agus Suharyanto, Dian Sisinggih
Study on the Effectivity of Decreasing Permeability and Increasing Shear Strength of
Sandy Beach Soil And River Soil By Using Exoplysaccharide Biopolymer ............... C-62
Emma Yuliani, Maytri Handayani, Ariska Desy Haryani
Heat Effect on Fluid Free Convection Flow Past A Porosity Sphere ......................... C-70
Mohamad Tafrikan, Basuki Widodo, Chairul Imron
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Incompressible and Steady Mixed Convection Flow Past Over a Sphere ................. C-78
Mohammad Ghani, Basuki Widodo, Chairul Imron
Viscoelastic Fluid Past a Flat Plate with the Effect of Magneto hydrodynamic ........ C-85
Putri Pradika Wanti, Basuki Widodo, Chairul Imron
Flow Measurement Under Sluice Gate Model ............................................................ C-94
Rustiati, N.B., Suhardjono, Rispiningtati, Dermawan, V., Krisnayanti, D.S
Kinetic Modeling of Domestic Wastewater (Greywater Type) Using Uasb
Reactor ........................................................................................................................ C-102
S. Syafrudin , P. Purwanto, S. Sudarno
An Imaging Technique for Identifying Flow Structure and Magnitude In
A Channel ................................................................................................................... C-113
Tommy E. Sutarto, Habir, S.S.N. Banjarsanti
The Numerical Solution Of Free Convection Flow of Visco-Elastic Fluid With Heat
Generation Past Over A Sphere ............................................................................... C-122
Wayan Rumite, Basuki Widodo, Chairul Imron
Assessment of Sedimentation Patterns and the Threat of Flooding due to Reclamation in
The Lamong Bay, Indonesia ...................................................................................... C-128
Mohammad Sholichin, Tri Budi Prayogo, Sebrian Mirdeklis Beselly Putra, Rini Wahyu Sayekti
Design Improvements To The Physical Model Test Spillway Of Mujur Dam In Lombok
Tengah Region............................................................................................................ C-145
Dian Chandrasasi , Dwi Priyantoro, Anggara WW. Saputra
Hydropower Plant using Pump storage at Cisokan Dam ......................................... C-151
Endang Purwati
Model Test of Physical Spillway In Lesti Dam, Malang District East Java ............. C-155
Heri Suprijanto, Janu Ismoyo, Sumiadi, Yuli Astuti
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A Network Rain Station in Reviewed of the Topography on Watershed Widas District
Nganjuk – East Java of Indonesia ............................................................................. C-163
Eri Prawati, Suhardjono, Lily Montarcih, Rispiningtati
Application of Design Charts for Determination of Landfill Liner’s Thickness ... C-170
Andre Primantyo Hendrawan, Anggara Wiyono Wit Saputra, Runi Asmaranto, Dian Chandrasasi, Hestina
Eviyanti, Zaenal Abidin
Environmental Engineering &
Water Technology
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Potential Greywater Quantification for Reuse in Newton
Residence Apartment Bandung, Indonesia
Dyah Asri Handayani TAROEPRATJEKA1*, Yulianti PRATAMA1, Devi Ayu PUTRIANTI1
1 Department of Environmental Engineering, Institut Teknologi Nasional (Itenas), Jl.
Penghulu K.H. Hasan Mustafa 23 Bandung, Indonesia *Corresponding author’s e-mail: [email protected] ABSTRACT Newton Residence Apartment is a 3-tower high-rise residential building located in Bandung, West Java, Indonesia. With the total number of 915 units and 47,472 m2 building area, covering 5,349 m2 of land, each tower consists of 22 to 36 floors. Total population of the building (including residents, employees, and visitors) is approximately 3, 245 people. The objective of this study is to determine whether greywater generated in this building could contribute a significant amount of water to reuse, thus reducing the quantity of clean water pumped from the deep well as the main source. Preliminary identification found that water generated from washbasin, floor drains from showers and faucets used for ablution, and air-conditioning (AC) condensate, as suitable sources as they fall into light greywater category. The result showed that the high-rise residential building has sufficient greywater quantity potential for reuse to cover all of the 69.72 m3/day toilets and urinals flushing requirements. Greywater reuse could contribute up to 22% of the building’s clean water quantity requirement, thus reducing the amount taken from the current source of deep well pumping, and save approximately Rp. 275,219,453.- per year of the current ground water tariff in Bandung. KEYWORDS Greywater reuse, AC-condensate recovery, quantification, high-rise residential buildings. INTRODUCTION The diminishing supplies of the earth’s freshwater leave no other choices for humankind than to use it wisely. One of means of water conservation is through water reuse, which can be done through greywater reuse for toilet flushing and landscape irrigation in high-rise residential buildings. To measure out the possibility, a quantitative study was done in Newton Residence Apartment Bandung, Indonesia. Greywater is a term used for wastewater discharges from residential buildings, excluding excreta and kitchen sinks. Discharges containing excreta, usually from toilets and urinals, are called blackwater. In order to maximize the potential quantity of greywater, the plumbing lines should be strictly separated from blackwater lines. Grey-water also requires separate treatment process before being reused for toilet flushing and fire-protection system. Newton Residence Apartment is a 3-tower high-rise residential building located in Jalan Terusan Buah Batu no. 5 Bandung, West Java, Indonesia. As part of Newton The Hybrid Park, the apartment units are located in tower A and B, while tower C functions as a hotel. Each tower has its own basement and roof-top floor with 22 to 36 floors, sharing a podium up to the first four floors, and low rise apartment units in the 5th and 6th floor. There were four
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types of unit in those towers: the one bedroom, 2-bedroom, 3-bedroom and studio, with total number of 915 units and building area of 47,472 m2, covering 5,349 m2 of land. Facilities in the building include a main lobby, offices, meeting rooms, prayer rooms (musholla), gym, spa, restaurants, mini market, and parking area. Total population of the building (including residents, employees, and visitors) is approximately 3, 245 people.
Figure 1. Artist’s Depiction of Newton The Hybrid Park (Picture courtesy of Margahayu
Land, 2014)
The objective of this study is to determine whether greywater generated in this building could contribute a significant amount of water to reuse, thus reducing the quantity of clean water that should be pumped from the main source, which is the deep well. The scope of the study is to identify and quantify potential greywater generation from applicable sources for reuse – after subsequent treatments - for toilet flushing and landscape irrigation. METHODS In Newton Residence Apartment Bandung, potential sources of greywater were identified. Population numbers of the building was determined according to the area and functions of spaces in the building based on the building’s plans and Neufert Architect’s Data (Neufert, 2002). The population were comprised of the building’s residents, employees, and visitors using plumbing facilities in the building. The clean water quantity requirement for the building was first calculated by referring to SNI-03-7065-2005 Plumbing System Planning Procedures (Tata Cara Perencanaan Sistem Plambing) (Badan Standardisasi Nasional, 2005), according to the building’s function and number of population. Another calculation of water use according to water-conserving plumbing fixture types then followed, with each plumbing fixtures’ water use per minute, time duration and typical number of usage per day took into account to determine the specific number of water being generated by each type of plumbing fixtures.
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After the clean water quantity has been determined, it was assumed that total wastewater discharge was 90% of clean water quantity, while the greywater’s discharge was 80.65% of all wastewater discharge (Komala, Primasari, Kirana, & Sari, 2012). The quantity of greywater from AC condensate was determined by “Condensate Calculator” (Wilcut & Fry, 2010) due to limited study of AC condensate quantity in Indonesia. The Condensate Calculator put into account the outdoor and indoor temperatures and relative humidity, the AC’s tonnage of system, percentage of outside air and produces the condensate’s quantity in gallons per minute, gallons per hour, and gallons per day. The results are then compared to published literatures of greywater researches for discussions. RESULTS AND DISCUSSIONS The identification of potential sources of greywater in Newton Residence Bandung found water generated from washbasin, floor drains from showers and faucets used for ablution, and air-conditioning (AC) condensate, as the suitable sources as they fall into light greywater category. Figure 2 shows the categories and sources of greywater.
Figure 2. Greywater sources and their constituents (Morel & Diener, 2005), (Noah, 2002), (Queensland Government, 2008) as cited in (Ghaitidak & Yadav, 2013). A study found that only buildings over approximately 9,280 m2 typically yield enough AC condensate to justify the expense of condensate recovery for either cooling towers or landscape (Guz, 2005). Based on that, Newton Residence Apartment with its 47,472 m2 building area was a suitable candidate for AC-condensate recovery. The clean water calculation, based on the population of 3,245 people, yielded a requirement of 691.92 m3/day. By comparison, clean water requirement calculation based on water-conserving plumbing fixtures gave the result of 157 m3/day, since this method doesn’t put into account the amount of water used for cooking, drinking, and other uses. The wastewater discharge calculated from water conserving plumbing fixtures was 141.30 m3/day, comprised of 113.96 m3/day greywater and 27.34 m3/day blackwater.
Greywater
Light Greywater Dark Greywater
Bathroom: Contains soaps,
shampoos, body care products, hair, body fats, lint, and traces
of urine.
Washbasin: Contains soaps,
toothpaste, body care products, shaving
waste, hair
Kitchen sinks: Contains food residues, high
amount of oil and fat, dish washing
detergents
Laundry: Contains soap,
bleaches, oils, paints, solvents, and non-
biodegradable fibers from clothing
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By using the assumption of outside air temperature of 32°C (89F) and relative humidity of 95%, indoor temperature of 25° (77F) and 58% relative humidity, tonnage of system based on 1 PK AC of 2.85 kW (0.8134 ton) and 17% outside air, the AC Condensate Calculator generated 4.75 gallons per day (17.98 L) for a single split Air Conditioner. There were 1,786 units of single split ACs in the building, thus producing 32.11 m3/day (5.89 GPM) of condensate. To ensure the calculation generated by the AC Condensate Calculator produced realistic results, field data was also obtained by collecting AC condensate from an operating single split AC in one of Newton Residence office buildings. The AC produced 40 L of condensate per day (Putrianti, 2015). In comparison, projects capturing air-conditioning condensate in San Antonio, USA, showed that 250 gallons (0. 946L) of condensate was generated each day by the downtown mall, and a central library produced 1GPM (0.06 L/s). Bahrain Airport Services in the Middle East uses 2.3 million gallons (8.7 million L) per year of condensate water for diverse purposes such as toilet flushing, washing, and landscape (Guz, 2005). The result of potential greywater discharge quantity and percentage according to the sources in Newton Residence Apartments is shown in Table 1.
Table 1. Potential Greywater Discharge and Percentage in Newton Residence Apartments
Source Greywater Discharge (m3/day) Percentage (%) Floor Drains (Showers) 93.99 62.33 Air-conditioning condensate 36.85 24.43 Washbasins 19.72 13.08 Floor Drains (Ablution Faucets) 0.25 0.17 Total 150.81 100
Figure 3. Distribution of Greywater Discharge Percentage
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The largest source of greywater discharge, according to Table 1 and Figure 3, was the shower floor drain, with 62.33% of total greywater discharge. Air-conditioning condensate was at the second place, with 24.43% of total discharge. The condensate was followed respectively by washbasins and floor drains from ablution faucets with 13.08% and 0.17% of total discharge. For comparison, a study in cities of Irbid, Rusaifa, and Zarqa in Jordan showed that the biggest contributors of greywater in those semi-arid climate cities were from sink water (50-64%), followed by shower water (22%-33%), and laundry water (15-20%) (Jamrah & Ayyash, 2008). Sink water in that study were coming from limited activities such as hand washing, ablution, tooth brushing, and hair washing, more related to activities being at washbasin in this study, instead of kitchen sink. These differences in greywater generation could be related to climate and customary differences. In Indonesia, due to the tropical climate, it is customary for each person to take showers twice a day. While in Jordan, with its semi-arid climate, people may not need to take showers as often as in Indonesia, and use the washbasin instead. In terms of water quality, air-conditioning condensate has favourable quality due the condensation process, where condensate-water is distilled, pure water when it forms on the condensate coils of an air handler. However, it can pick up bacterial contamination during formation and transport (Guz, 2005). The greywater, after being collected and treated, will be used for toilets and urinals flushing and for landscape irrigation. The quantity will reduce after treatment, although the lost amount still cannot be determined due to limited study on the subject. One of the recommended greywater treatment that has proven its effectiveness and suitability for over 10 years in multi-story buildings, was through a series of funnel-shaped sedimentation tanks with sludge-removing devices, followed by a vertical-flow sand filter with reed bed, or a multiple-stage rotary biological contactor (RBC), or alternatively a trickling filter, coupled to a clearing tank to remove the biomass. The treated water is then disinfected by UV before it stored in the service water tank. Similar to stormwater systems, light also has a negative effect on greywater system and therefore, service tanks should be protected against daylight (Nolde, 1999).
Table 2. Calculation of Toilet and Urinal Water Flushing Quantity Requirements in Newton Residence
Population Population Number
Toilet Flushing Water
Requirements (L/person/day)
Total (L/day)
Total Men Women Men Women Apartment residents 1.628 - 24 39.072 Hotel guests 910 - 24 21.840 Employee 257 129 128 12,4 14,4 3.442,8 Meeting Room visitors 362 181 181 12,4 14,4 4.850,8 Gym and Spa guests 40 20 20 4,8 9,6 288 Restaurant & Mini Market guests 48 24 24 4,8 4,8 230,4
Total Toilet and Urinal Water Flushing Quantity Requirement (Liter/day) 69.724 Total Toilet and Urinal Water Flushing Quantity Requirement (m3/day) 69,72
Source : (Putrianti, 2015)
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From calculation in Table 2, we could see that water quantity required for toilets and urinals flushing was 69.72 m3/day, or 46.23% from potential greywater generation. The remaining greywater discharge could serve as an alternative water supply for the building’s landscape irrigation, replacing the building’s main water source, in this case, a deep well. The greywater reuse will provide up to 22% of the 691.92 m3/day population-based clean water requirement. Greywater reuse will reduce the quantity of groundwater needed to be pumped out of the building’s deep well. This will be more beneficial for the environment, and with the current ground water tariff of Rp. 5,000/m3 in Bandung (Ramdani, 2014), greywater reuse in Newton Residences would save approximately Rp.754, 025. - per day or Rp. 275,219,453.- per year. The treated greywater quality should be periodically compared to applicable standards for regulatory compliance. Currently, there are still no standard that specifically addresses greywater quality for reuse in Indonesia. Up until then, PP 82/2001 on Water Quality Management and Pollution Control (Pemerintah Republik Indonesia, 2001) could fill in, with greywater falling into water quality standard Class IV (least stringent), referring to its application for plants irrigation. The greywater system should also be tested once under several different conditions (e.g. faecal contamination, application of household chemicals) before operation. Following installation, a qualified inspection should be made, in which a full compliance to standard-installation regulation takes place. The operation of non-registered and untested greywater systems is connected to a potential hygienic risk to the user and the drinking water network (Nolde, 1999). CONCLUSION The identification and quantification of greywater generation in Newton Residence Apartments has showed that:
• The high-rise residential building has sufficient greywater quantity potential for reuse to cover all of the 69.72 m3/day toilets and urinals flushing requirement, while the remaining discharge could further be used for landscape irrigation.
• Greywater reuse could contribute up to 22% of the building’s clean water quantity requirement, thus reducing the amount taken from the current source of deep well pumping and save approximately Rp. 275,219,453.- per year of the current ground water tariff in Bandung.
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Morel, A., & Diener, S. (2005). Greywater treatment on household level in developing countries- a state of the art review. Retrieved December 13, 2012, from http://www.susana.org/lang-en/ library?view=ccbktypeitem&type=2&id=1047.
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