eproc.punjab.gov.pkeproc.punjab.gov.pk/biddingdocuments/50484956/4850/...2018-02-201. the water and...

THESE DOCUMENTS ARE ONLY FOR STUDY PURPOSE. FOR PARTICIPATION, BIDDING DOCUMENTS MAY BE PURCHASED FROM THE

OFFICE OF P&D WASA FAISALABAD PAKISTAN.

WASA Faisalabad Government of the Punjab Operation and Maintenance of New Jhal 10 MGD Water Treatment Plant

January 2018 Page 1

1. LETTER OF INVITATION TO BID

Invitation No.: ________WASA/ Faisalabad Pakistan dated _____________

Company and Address………………………………………………………………………………

..................................................................................................................................................

Dear,

1. The Water and Sanitation Agency, (FDA) Faisalabad intends to invite proposals to

provide the services: “Operation and Maintenance of New Jhal 10 MGD Water

Treatment Plant ”. Further details of the services to be provided are included in the

Terms of Reference, and Draft Agreement forming part of these Bid Documents.

2. This Request for Proposal (RFP) will be provided only to those

firms/companies/authorized representatives who have experience in installation,

operation and maintenance of WTP (operated through SCADA system) for which

the bidder shall have to provide all documentary evidence mentioned in “Invitation

for Bids” published and circulated through various forums.

3. The firm (bidder) will be selected under the prescribed procedure, described in the

bidding documents (RFP attached), in accordance with the laws of the Islamic

Republic of Pakistan.

4. The bidder shall be bound to comply with all rules & regulations and laws of Islamic

Republic of Pakistan.

5. In case of any dispute, arbitration laws will be applicable and decision of Pakistan

Court will be final.

6. The RFP includes the following documents:

• Section 1: Letter of Invitation

• Section 2: Instructions to Bidders (including Data Sheet)

• Section 3: Terms of Reference

• Section 4: Preamble to the Bills of Quantities

• Section 5: Bills of Quantities

• Section 6: General Conditions of Contract

• Section 7: Particular Conditions of Contract

• Section 8: Standard Forms


January 2018 Page 2

• Section 9: Operation & Maintenance Manual

• Section 10: As Built Drawings of Water Treatment Plant

7. A Pre-Bid meeting will be held on 17th February 2018 at WASA main office.

Deputy Director (P&D) WASA Faisalabad WASA main Office Near Allied Hospital Jail road Faisalabad Islamic Republic of Pakistan Tel.: + 92 41 921 0058 Fax: + 92 41 921 0054 Email: [email protected]

[email protected]

Yours Sincerely,

Deputy Director (P&D) Water and Sanitation Agency Faisalabad

mailto:[email protected]



January 2018 Page 3

Qualification / Selection Criteria

1.1 ELIGIBILITY CRITERIA

a) Bidder should provide accurate information on any litigation or arbitration

resulting from contracts completed or under its execution over the last five (5)

years from 2012 to 2017. A consistent history of awards against the Applicant

or any partner of a joint venture may result in failure of the application.

b) Bidder should provide Bid security @ 2% of the bid cost.

1.2 FINANCIAL QUALIFICATION OF THE BIDDER

a) The audited balance sheets, acceptable to the Employer, for the last three

(3) years shall be submitted and must demonstrate a minimum turnover of

750 Million per year. If deemed necessary, the Employer shall have the

authority to make inquiries with the Bidder’s bankers.

1.3 GENERAL QUALIFICATION / REQUIREMENT OF THE BIDDER

a) The operator should be registered with Pakistan Engineering Council in

Category at least C3, preferably operator in O3 category of PEC.

b) The contractor should have worked on minimum three projects as operator in

any Water or Waste Water Treatment Plants in Pakistan or abroad during last

10 years.

c) The contractor / operator should have construction experience of minimum 3

Water or Waste Water Treatment Plants of minimum 5 MGD each & have

operating experience for three years during last 10 years.

d) The operator should have experience to operate SCADA enabled water

treatment plant.

e) The operator should be able to bring along expertise of two foreign experts

who have relevant experience of plant operation.

1.4 PERSONNEL QUALIFICATION OF THE BIDDER

The Bidder shall supply general information on the management structure of the

project, and shall make provision for suitably qualified personnel to fill the key

positions, as needed, during contract implementation. The key personnel for this

purpose may include:


January 2018 Page 4

Sr. No Key Personnel Qualification Minimum

Experience

Minimum Experience In Similar

Field

Nos. Of Personnel

Foreign Local

1. Foreign Expert M.Sc Engg PHE/Mech or B.Sc. with min. 20 years

experience since graduation. 15 10 1 -

2. Expert WTP Specialist on part time retainer B.Sc in Elect/Mech 20 10 1 -

3. Plant Manager M.Sc Engg PHE/Mech or B.Sc. with min 20 years

experience since graduation. 15 10 - 1

4. Shift Engineer B.Sc. Electrical or Mechanical 5 2 - 3

5. Electrical Engineer B.Sc. Electrical 5 2 - 1

6. Mechanical Engineer B.Sc. Mechanical 5 2 - 1

7. SCADA Engineer B.Sc. Elect/Mech 5 3 - 1

8. Instrument Engineer B.Sc.

Elect/Electronics/Mechatronics 5 2 - 1

9. Laboratory Specialist B.Sc Chemical Engineering /

M.Sc. Microbiologist 5 2 - 3

10. Safety Engineer B.Sc. Engineering with

certification of NABOSH 5 2 - 1

11. Plant Operator DAE (Elect./ Mech.) 10 2 - 3

12. Elect. & Instrumentation Technician DAE Elect./ Electronics 10 2 - 3


January 2018 Page 5

2. INSTRUCTIONS TO BIDDERS

2. INSTRUCTIONS TO BIDDERS .................................................................................................................... 5

Preamble ............................................................................................................................................................ 6

1 Introduction ............................................................................................................................................... 6

2 Clarification and Amendment of RFP Documents .................................................................................... 9

3 Preparation of Proposals ........................................................................................................................ 10

4 Submission, Receipt and Opening of Proposals ..................................................................................... 11

5 Proposal Evaluation ................................................................................................................................ 12

6 Negotiations ............................................................................................................................................ 12

7 Award of Contract ................................................................................................................................... 12

8 Confidentiality ......................................................................................................................................... 13

9 Proposal Evaluation Procedure .............................................................................................................. 13

10 Data Sheet .............................................................................................................................................. 16


January 2018 Page 6

Preamble (a) “Client” means the Agency (WASA-FSD) with which the selected Contractor signs

the Contract for the Services.

(b) “Contract” means the contract signed by the Parties and all the attached

documents listed in the ‘Letter of Invitation to Bid’

(c) “Operator” means the agency that may provide or provides the Services to the

Client under the Contract.

(d) “Data Sheet” means such part of the Instructions to Tenderers used to reflect

specific conditions.

(e) “Day” means calendar day.

(f) “Instructions to Tenderers” (Section 2 of the RFP) means the document which

provides shortlisted Tenderers with all information needed to prepare their

Proposals.

(g) “LOI” (Section 1 of the RFP) means the Letter of Invitation being sent by the Client

to the shortlisted Tenderers.

(h) “Proposal” means technical & financial proposal to be submitted by Tenderers in

the form of Section 5 ;Bill of Quantities’ of this RFP

(i) “RFP” means the Request for Proposal to be prepared by the Client for the

selection of Contractors.

(j) “Services” means the work to be performed by the Operator pursuant to the

Contract.

(k) “Sub-Contractor” means any person or entity with whom the operator subcontracts

any part of the Services.

(l) “Terms of Reference” (TOR) means the document included in the RFP as Section

3 which explains the objectives, scope of work, activities, tasks to be performed,

respective responsibilities of the Client and the Contractor, and water quantity and

quality.

1 Introduction 1.1 The Client named in the Data Sheet will select an operating firm (the

Operator) from those listed in the Letter of Invitation, in accordance with the

method of selection specified in sections 9 and 10 of the ‘Instructions to

Tenderers’ the Data Sheet.


January 2018 Page 7

1.2 Tenderers are invited to submit a Proposal for contracting services required

for the assignment named in the Data Sheet. The Proposal will be the basis

for contract negotiations and ultimately for a signed contract with the

selected Operator.

1.3 Tenderers should familiarize themselves with local conditions and take them

into account in preparing their Proposals. Pre-bid meeting will be arranged

and the date for such pre-bid meeting is detailed in the Data Sheet.

1.4 The Client will timely provide at no cost to the Tenderers the inputs and

facilities specified in the Data Sheet, assist the firm in obtaining any licenses

and permits needed to carry out the services, and make available relevant

project data and reports.

1.5 Tenderers shall bear all costs associated with the preparation and

submission of their proposals and contract negotiation. The Client is not

bound to accept any proposal, and reserves the right to annul the selection

process at any time prior to Contract award, without thereby incurring any

liability to the Tenderers.

1.6 Conflict of Interest

Tenderers should provide professional, objective, and impartial advice and at

all times hold the Client’s interests paramount, strictly avoid conflicts with

other assignments or their own corporate interests and act without any

consideration for future work.

1.6.1 Without limitation on the generality of the foregoing, Tenderers, and any of

their affiliates, shall be considered to have a conflict of interest under any

circumstances set forth below:

(i) Conflicting Activities

A firm that has been engaged by the Client to provide goods, works or

services other than contracting services for a project, and any of its

affiliates, shall be disqualified from providing contracting services

related to those goods, works or services, where those services may

cause actual or potentially adverse interests of both parties and are

potentially at odds with the best interests of the Client.

(ii) Conflicting Relationships

A Tenderer (including its Personnel and Sub-Contractors) that has a

business or family relationship with a member of the Client’s staff who

is directly involved in any part of (i) the preparation of the Terms of

Reference of the assignment, (ii) the selection process for such

assignment, or (iii) the services for the assignment, may not be

awarded a Contract, unless the conflict stemming from this

relationship has been resolved in a manner acceptable to the Client

throughout the selection process and the execution of the Contract.


January 2018 Page 8

1.6.2 Tenderers have an obligation to disclose any situation of actual or potential

conflict that impacts their capacity to serve the best interest of their Client, or

that may reasonably be perceived as having this effect. Failure to disclose

said situations may lead to the disqualification of the Tenderer or the

termination of its Contract.

1.6.3 No agency or current employees of the Client shall work as Operators under

their own ministries, departments or agencies. Recruiting former government

employees of the Client to work for their former ministries, departments or

agencies is acceptable provided no conflict of interest exists. When the

Operator nominates any government employee as Personnel in their

Proposal, such Personnel must have written certification from their

government or employer confirming that they are on leave without pay from

their official position and allowed to work full-time outside of their previous

official position. Such certification shall be provided to the Client by the

Tenderer as part of his Proposal.

1.6.4 Unfair Advantage

If a short-listed Tenderer could derive a competitive advantage from having

provided contracting services related to the assignment in question, the

Client shall make available to all short-listed Tenderers together with this

RFP all information that would in that respect give such Tenderer any

competitive advantage over competing Tenderers.

1.7 Fraud and Corruption

It is the policy to require that Tenderers and their agents (whether declared

or not), personnel, sub-contractors, sub-consultants, service providers and

suppliers, under financed contracts, observe the highest standard of ethics

during the selection and execution of such contracts. In pursuance of this

policy:

(a) It is defined, for the purposes of this provision, the terms set forth below

as follows:

(i) “corrupt practice” is the offering, giving, receiving or soliciting,

directly or indirectly, of anything of value to influence improperly

the actions of another party;

(ii) “fraudulent practice” is any omission, including

misrepresentation, that knowingly or recklessly misleads, or

attempts to mislead, a party to obtain financial or other benefit or

to avoid an obligation;

(iii) “collusive practices” is an arrangement between two or more

parties designed to achieve an improper purpose, including to

influence improperly the actions of another party;


January 2018 Page 9

(iv) “coercive practices” is impairing or harming, or threatening to

impair or harm, directly or indirectly, any party or the property of

the party to influence improperly the actions of a party;

(v) “obstructive practice”

a. Deliberately destroying, falsifying, altering or concealing of

evidence material to the investigation or making false

statements to investigators in order to materially impede an

investigation into allegations of a corrupt, fraudulent,

coercive, or collusive practice; and / or threatening,

harassing, or intimidating any party to prevent it from

disclosing its knowledge of matters relevant to the

investigation or from pursuing the investigation, or

b. Acts intended to materially impede the exercise of inspection

and audit rights.

(b) Will reject a proposal for award if it determines that the Tenderer

recommended for award has, directly or through an agent, engaged in

corrupt, fraudulent, collusive, coercive, or obstructive practices in

competing for the contract in question.

1.8 Only One Proposal

Tenderers may only submit one proposal. If a Tenderer submits or

participates in more than one proposal, such proposals shall be disqualified.

However, this does not limit the participation of the same Sub-Contractor,

including individual experts, to more than one proposal.

1.9 Proposal Validity

The Data Sheet indicates how long the Tenderers’ Proposals must remain

valid after the submission date. During this period, the Client will make its

best effort to complete negotiations within this period. Should the need arise;

however, the Client may request Tenderers to extend the validity period of

their proposals. Tenderers who do not agree have the right to refuse to

extend the validity of their Proposals.

2 Clarification and Amendment of RFP Documents 2.1 Tenderers may request a clarification of any of the RFP documents up to the

number of days indicated in the Data Sheet before the proposal submission

date. Any request for clarification must be sent in writing, or by standard

electronic means to the Client’s address indicated in the Data Sheet. The

Client will respond in writing, or by standard electronic means and will send

written copies of the response (including an explanation of the query but

without identifying the source of inquiry) to all Tenderers. Should the Client

deem it necessary to amend the RFP as a result of a clarification, it shall do

so following the procedure under para. 2.2.


January 2018 Page 10

2.2 At any time before the submission of Proposals, the Client may amend the

RFP by issuing an addendum in writing or by standard electronic means.

The addendum shall be sent to all Tenderers and will be binding on them.

Tenderers shall acknowledge receipt of all amendments. To give Tenderers

reasonable time in which to take an amendment into account in their

Proposals the Client may, if the amendment is substantial, extend the

deadline for the submission of Proposals.

3 Preparation of Proposals 3.1 The Proposal (see para. 1.2), as well as all related correspondence

exchanged by the Tenderers and the Client, shall be written in the

language(s) specified in the Data Sheet.

3.2 In preparing their Proposal, Tenderers are expected to examine in detail the

documents comprising the RFP. Material deficiencies in providing the

information requested may result in rejection of a Proposal.

3.3 While preparing their Proposal, Tenderers must give particular attention to

the following:

(a) If a Tenderer considers that it may enhance its expertise for the

assignment by associating with other Operators in a joint venture or

other relationship, it may associate with other firm(s). In case of a

joint venture, all partners shall be jointly and severally liable and shall

indicate who will act as the leader of the joint venture.

(b) The number of months for the assignment shall be shown in the Data

Sheet.

(c) Language

Documents to be issued by the Tenderers as part of this assignment

must be in the language specified in the Reference Paragraph 3.1 of

the Data Sheet.

3.4 Taxes

Tax, social security taxes or any other levies in Pakistan must be included in

the price given.



3.5 Documents to be Submitted with Bid

The following documents shall be submitted by all Bidders with their Bids for the

Project:

1/ Administrative documents

• Letter of Invitation

• Tender Security, in accordance with the hereunder Form of Tender Security

• Letter of Tender and Appendix to Tender

2/ Qualification/Selection Criteria

• Eligibility, Financial and General and Technical Qualification Criteria justification and documentation, as per the Qualification/Selection Criteria detailed in Section 9 of ‘Instructions to Tenderers’ and Chapter-VI of PPRA Rule, 2014)

3/ Bill of Quantities

• Schedule of Prices in accordance with Section 5 of the RFP.

4 Submission, Receipt and Opening of Proposals 4.1 Procedure for open competitive bidding:

Single stage two envelope (technical & financial) as PPRA Rules 2014)

4.1.1 The bid shall comprise a single package.

4.1.2 The proposals of bids shall be opened publicly at a time, date and venue

announced and communicated to the bidders in advance.

4.1.3 The proposal of bids found technically non-responsive / not qualifying the

passing marks i.e., 70%, the financial bid shall be returned un-opened to the

respective bidders.

4.1.4 After technical evaluation, the financial bid found to be the lowest evaluated

price shall be accepted.

4.2 The original proposal shall contain no interlineations or overwriting, except

as necessary to correct errors made by the Tenderers themselves. The

person who signed the proposal must initial such corrections.

4.3 An authorized representative of the Tenderer shall initial all pages of the

original proposal. The authorization shall be in the form of a written power of

attorney accompanying the Proposal or in any other form demonstrating that

the representative has been duly authorized to sign.



4.4 The Proposal shall be marked “Original” and “Copy” as appropriate and shall

be sent to the address referred to and in the number of copies referred to in

the Data Sheet.

4.5 The original and all copies of the Proposal shall be placed in a sealed

envelope. This envelope shall bear the submission address, reference

number and title of the Project, and be clearly marked “Do Not Open, Except

In The Presence Of The Official Appointed Before.

4.6 The Proposal must be sent to the address indicated in the Data Sheet and

received by the Client not later than the time and date indicated in the Data

Sheet, or any extension to this date in accordance with para. 2.2. Any

proposal received by the Client after the deadline for submission shall be

returned unopened.

4.7 The Client shall open the Proposals on the time and date as specified in the

Data Sheet. The Tenderers are welcome to attend the opening of the

Proposals.

5 Proposal Evaluation 5.1 From the time the proposals are opened to the time the contract is awarded,

the Tenderers should not contact the Client on any matter related to its

Proposal. Any effort by the Tenderers to influence the Client in the

examination, evaluation, ranking of Proposals, and recommendation for

award of Contract may result in the rejection of the Tenderers Proposal.

6 Negotiations 6.1 Contract Negotiations will be held at the date and address indicated in the

Data Sheet. Representatives conducting negotiations on behalf of the

Tenderer must have written authority to negotiate and conclude a Contract.

6.2 Conclusion of the Negotiations

Negotiations will conclude with a review of the draft Contract. To complete

negotiations the Client and the Tenderer will initial the agreed Contract. If

negotiations fail, the client will invite the Tenderer whose Proposal was

ranked second in order to negotiate a Contract.

7 Award of Contract 7.1 After completing contract negotiations, the Client shall award the Contract to

the selected Operator and promptly notify all Tenderers who have submitted

Proposals.



8 Confidentiality Information relating to evaluation of Proposals and recommendations concerning

awards shall not be disclosed to the Tenderers who submitted the Proposals or to

other persons not officially concerned with the process, until the announcement of the

award of the Contract. The undue use by any Tenderer of confidential information

related to the process may result in the rejection of its Proposal.

9 Proposal Evaluation Procedure The evaluation procedure to be utilised in the identification and determination of the

positioning of the Bidders shall be as per the table below, accordingly the bidder are

required to give all these details in the Technical Proposals.

Ref. Requirement as Firm Evaluation System

A. Eligible Bidders

A.1 Written Power of Attorney of the signatory to the Original Bid and the Contract.

Pass / Fail

A.2 PEC License in C3 / O3 Pass / Fail

A.3 Bank Guarantee. Pass / Fail

A.4 The Applicant should provide accurate information on any litigation or arbitration resulting from contracts completed or under its execution over the past five (5) years.

Pass / Fail

B. Financial Capacity

B.1 The audited balance sheet acceptable to the Employer, for the past three (3) years demonstrating a minimum turnover of PKR 750 Million per year or equivalent must be submitted.

Pass / Fail

B.2 The Bidder shall provide evidence that it has access to, or has available, liquid assets of PKR 01 Billion

Pass / Fail



C. Experience

C.1 Bidder shall provide evidence that it has completed successfully Three Water/Waste Water Projects, minimum value each project PKR 500 Million, for last 10 years.

15 points (5 points per ref.)

C.2 Bidder shall provide evidence

that it has carried out three

Operation and Maintenance

Water / Waste water Projects

each with a water output

minimum 5 MGD, for last 10

years.

15 points (5 points per ref.)

C.3 The Operator shall have to

provide two evidences for

operation & maintenance of

NRW equipments, linked to

SCADA.

10 Points (5 points per ref.)

D. Personnel

Qualifications and experience

of key personnel as necessary

depending on operational

requirements

General Experience

Relevant Experience

D.1 Foreign Expert with Water, NRW

and General Project Experience

15 10 08 points

D.2 WTP Specialist on part time

retainer

20 10 07 points

D.3 Plant Manager with Water

Project Experience

15 10 05 points

D.4 SCADA Engineer 5 2 05 points

D.5 Instrument Engineer 5 3 05 points

D.6 Elect. / Mech. Engineer 5 2 05 points

D.7 Safety Engineer 5 3 05 points



E. Quality of Technical Offer

E.1

Management Plan, Work Plan & staffing schedule required for Operation and Maintenance of the WTP.

08 Points (4 points

each)

F. Standard of Training

F.1 Training plan for Pakistani employees and workers in management, operation and maintenance of works and equipment.

10 points

G. HSE Plan

G.1 Health, Safety & Environment Plans for operation & maintenance of plant

02 points

Total Number of Points Available 100

points

Minimum Points Requirement for Pass 70 points



10 Data Sheet Paragraph Reference Description

1.1 Name of the Client: Water and Sanitation Agency WASA Faisalabad Method of Selection: Single Stage – Two Envelope Procedure (Technical & Financial)

1.2 Type of Proposal: Technical & Financial Proposals Name of the Assignment: Operation and Maintenance of New Jhal 10 MGD WTP

1.3 A Pre-Bid Meeting will be held: Yes (17th Feb 2018) 1.4 The Client will provide the following inputs and facilities: The Client will provide all

available documentation and necessary reports 1.9 Proposals must remain valid 60 days from the submission date 2.0 Proposals shall be submitted at the following address:

Dy. Director P&D (Contract section) Head Office Opposite Allied Hospital Faisalabad Islamic Republic of Pakistan Tel.: + 92 41 921 0058 Fax: + 92 41 921 0054 Email: [email protected] [email protected]

2.1 Clarifications may be requested not later than 14 days before the submission date The address for requesting clarifications is: Dy. Managing Director (Engg.) Head Office Opposite Allied Hospital Faisalabad Islamic Republic of Pakistan Tel.: + 92 41 921 0246 Fax: + 92 41 921 0054 Email: [email protected] [email protected]

3.1 Proposals shall be submitted in the following language: English 3.3 (b) The contract period of the works is: 24 months (which may be extended with mutual

consent & terms and conditions) Training is a specific component of this assignment: Yes

3.4 Amounts payable by the Client to the operator under the contract to be subject to local taxation: Yes

4.5 Bidder must submit the Original plus Three (3) copies of the Proposal 4.6 The Proposal submission address is: As stated in Clause 2.0 above

Proposals must be submitted not later than the following date and time: On or before 1200 hours on 22/02/2018

6.1 Expected date and address for contract negotiations: 24/03/2018 Address: As stated in clause 2.1 above

7.1 Expected date for commencement of services:31/03/2018 (afternoon)







3. TERMS OF REFERENCE

1.0 INTRODUCTION The Government of the Islamic Republic of Pakistan received a loan from the

Government of the French Republic towards the cost of the “Extension of Water

Resources for Faisalabad City Phase 1”. This project is now completed and WASA

now wishes to Outsource the operation and Maintenance of this facility for a 3 year

initial period with option to renew for a further 3 years.

2.0 BACKGROUND Faisalabad is the third largest city of Pakistan with an estimated population of three

million and a projected population growth rate of approximately 3.7%. It has emerged

as an industrial city dominated by the textile industry, with a total annual export worth

of US$7 billion. It is located on an almost flat terrain, only 0.05% of slope, of the

alluvial plain with no natural drain in the city. The Rakh Branch Canal passes through

the city dividing it into two distinct zones, eastern and western. The ground water of

the city is brackish. A very limited quantity of potable water is available as seepage of

the canal water. Surface Water Treatment Plants have been used to provide treated

canal water to the city in limited quantities. The major supply, approximately 90%, is

derived from tubewells installed in the Chenab Wellfield located approximately 35 km

from the city. However, this involves multi-stage pumping which only serves to

increase the operation and maintenance cost of the water supply system.

The city was first provided with potable water in 1903 and the water works were

augmented over the years, including the supply of filtered water in 1939. After

independence, the growth of the population along with the development of the

industries continued at a fast pace, whereas efforts were made by the authorities to

supplement the facilities were not able to cope with the expansion.

To assess the long term requirements of the city, a Master Plan was prepared in the

years 1975 - 76 for a period of 25 years with the financial assistance of the Asian

Development Bank. It was proposed to be implemented in five distinct phases.

Following this, WASA had the original Master Plan updated in 1993 for the next 25

years up to the horizon year 2018, with the financial assistance of the World Bank.

Under this Master Plan, the Greater Faisalabad Project was proposed to be

implemented in three phases. Phase 2 actually covered the immediate improvement /

development needs of the water supply, up to the year 2000.



The present installed capacity is 110 MGD (including the addition of 15 MGD from the

French Project) against a current water demand of 170 MGD for a population of

approximately three million, although the actual coverage rate is projected to be

somewhere between 50% and 75%. This demand is currently 160 MGD in 2017.

Following completion of the ongoing Annual Development Plan Schemes, the demand

and supply gap in 2017 is 50 MGD.

3.0 BENEFITS OF THE PROJECT The benefits considered to be attributable to WASA Faisalabad as a consequence of

the implementation of Outsourcing the Operation and Management of the WTP are as

follows:

• Un-interrupted water supply for the citizens

• The trouble free / smooth operation of WTP

• WTP will be operated by a Specialist Operator

• WASA staff can obtain on job training / experience by Technology Transfer.

• Service delivery will be improved resultantly increase in the revenue.



4.0 RAW WATER QUALITY FROM RAKH BRANCH CANAL The quality parameter of the raw water from the Rakh Branch Canal are as indicated in the table

below:

TIME 4:30 P.M. 7:30 A.M.

pH 7.25 7.50

Conductivity (µS) 180 177

TDS (mg/l) 135 133

SO4 35.13 29.68

Cl 16.34 14.70

Ca 31.54 24.47

Mg 2.46 7.59

CO3 NIL NIL

HCO3 60.41 24.41

OH NIL NIL

NO3 14.70 13.40

Turbidity NTU Average 385 227

Fe (mg/l) 0.35 0.39

TRACE ELEMENTS : WHO STANDARS CANAL WATER VALUES

Ammonium < 40 < 0.010

Lead < 0.5 < 0.010

Nickel < 1 < 0.02

Copper < 1 < 0.002

Barrium < 1.5 < 0.001

Arsenic < 1 < 0.005

Cynide < 2 < 0.002

Mercury < 0.01 < 0.001

Cadmium < 0.1 < 0.002

Flouride < 20 < 0.14

Chromium < 1 < 0.01



5.0 NEW JHAL WATER TREATMENT PLANT OUTPUT WATER QUALITY

The required quality for Treated Water produced by the plant is the quality defined in

the "Guidelines for Drinking Water quality – Recommendations" of the World Health

Organization (WHO) 1984.

The table hereafter, in the column “PROJECT” gives the treated water quality to

respect by the Operation and Management Contractor. The column “WHO” gives the

treated water quality as for the WHO.

PARAMETER UNIT WHO PROJECT

pH - 6-8.5 6.7 to 8.2

Electrical Conductivity µS/cm N.S. 350-400

True Colour TCU Colourless Colourless

Turbidity NTU Less than 5 Less than 01

Total suspended Solids mg/l N.S. N.S.

Total dissolved Solids mg/l < 1000 200-350

Free Chlorine mg/l < 1 0.5 to 0.7

Sodium mg/l 200 40 – 50

Calcium mg/l 90 30 – 40

Magnesium mg/l 30 15 – 20

Chlorides mg/l 250 40 – 50

Carbonates mg/l N.S NIL

Bicarbonates mg/l N.S 60 – 70

Total Hardness mg/l < 500 150 – 200

Total Coliforms No./100 ml 0 0

Faecal Coliforms No./100 ml 0 0



6.0 PROJECT COMPONENTS

a) The project comprises the Operation and Management of the new Jhal 10 MGD

Water Treatment Plants constructed under a French Government Loan located

near Novelty Bridge as plan:-

10 MGD is run into a Raw Water tank under gravity from the Rakh Branch Canal through an automatic

screen to prevent debris from entering the tank. 3 No 1000 Cum/Hr pumps then force the incoming

canal water into the Distribution Chamber of the plant which is elevated approximately 5m above canal

water level. Then the water splits into two parallel treatment lines.

Solutions of Aluminium Sulphate, Sodium Hydroxide (Lime) and Anionic Polymer is added to the raw

water in the Coagulation Tanks and mixed in the Flocculation Tanks from where it passes to the

Lamella filter tanks. Here suspended solids settle to the bottom of the tank. The water partially cleaned



passes to two banks of rapid sand filters each bank comprises four tanks. After passing through the

rapid sand filters the water passes through a chlorine contact tank for disinfection before passing to a

water storage tank and then to the outlet pumping station. In the outlet pumping station 3No 1000

cum/hr pumps send the water into WASA’s existing Arterial Main on Sammundri Road.

The whole process in managed by a SCADA system which is automatic. A 1000Kva Standby

Generator is included.

The chemicals are stored dry in a Reagent Building and introduced into 4 mixing tanks with

mechanical stirrers and potable water then pumped to the Coagulation Section under control of dosing

pumps managed by the SCADA system.

Chlorine Gas cylinders are located in the Chlorine Building and the gas is mixed with potable water as

supervised by the SCADA system and pumped to the Contact Tank located directly under the Rapid

Sand Filters. There is an automatic chlorine recovery system in case of any leaks in the Chlorine

Building where the escaped gas is drawn through a Neutralisation Tower filled with Sodium Hydroxide

(Caustic Soda) to render it harmless.

The rapid sand filters are automatically washed with high pressure air and water as they become

progressively blocked with suspended particles managed by the SCADA system.

The sludge from the base of the lamella filters and the rapid sand filters released during washing is

collected in a recovery tank where it is pumped into a settlement tank whereby the thickened sludge is

pumped to one of eight sludge drying beds and the water released is pumped by to the distribution

chamber to mix with the incoming canal water.

There is a Collection Pit where all overflow water is collected and pumped back into to the Canal.

Water quality of the incoming water, temperature, pH, turbidity is automatically monitored at various

points in the treatment process as is the potable water leaving the plant.

There is an Administration Block which also houses the outlet pumping station in a basement, the

main electrical switch rooms, transformer on the public supply and the generator. Additionally it

houses the plant laboratory where manual tests may be performed in addition to the automated water

quality sensors.

b) Water Lagoon

There are water lagoons (capacity 32 MGD) for the storage of Raw water during the scheduled / un-

scheduled canal closure. Its proper functioning / operation will also be the prime responsibility of

the operator.



LIST OF EQUIPMENT (WTP)

Sr. # Description of Equipment/Material Qty

A. RAW WATER BUILDING

1. Penstock (1230 mm x 2250 mm) manually operated 2 No.

2. Automatic Fine Screen (complete unit) 1No.

3. Raw Water Pumps Flow 997m3/hr 11.5 m Head (PG) with 55 KW Vertical Induction Motor Complete with soft start motor control cabinet and auto operation facility with SCADA

3Sets

4. NRV 400mm 3 No.

5. Sound Trap 2 No.

6. Flow Meter 600 mm 1 No.

7.

Hoist with Mono Rail

(2 Ton) (1 Ton)

1 No. 1 No.

8. Mixer 3.3 KW 2 No.

9. UPS 900 W 1 No.

B. DISTRIBUTION CHAMBER

1. Penstock Gate 800 mm x 800 mm (Manually Operated) 2 No.

C. COAGULATION SECTION

1. Drainage Valve 150mm SS 4 No.

2. Agitator 1.5 KW Motor 51rpm 1.5 kw gear 1 Set

3. Auto Transmitter pH 1 Set

4. Auto Transmitter Turbidity 1 Set

5. Proximity Switch 2 No.

D. FLOCCULATION SECTION

1. Motor 1.5 KW, Gear 10 rpm 2 Sets

2. Transmitter pH + Temperature 2 No.


E. LAMELLA CLARIFIER

1. Complete Unit 2 No.

2. Sludge Extraction Valve (Air Pinch) 150 mm

Auto Manual

24 No. 4 No.

F. CLEAR WATER CHANNEL

1. Auto Transmitter for pH + Temperature, Turbidity 2 Sets



G. SAND FILTERS

1. Penstock 1000 x 600 8 No.

2. Bernard Motor 0.5 KW (Gear 100 rpm) 8 No.

3. Panels for Motor Control MCC 21-24 8 Units


5. Flow Meter for measuring flow of air 1 No.

6. Motor Control Unit 2 No.

7. Blower & Compressor 1 Set

H. FILTER GALLERY

1. Backwash Flow Meter 400 mm 1 No.

2. Auto Butterfly Valve

400 mm 250 mm 200 mm

8 No. 8 No. 16 No.

3. Manual Valve

50 mm 8 No.

4. Siphon Complete Unit 1 No.

5. Plasticization Tank 1 No.

6. Transducer 8 No.


I. BACKWASH PUMPING UNIT

1. Pumps KSB 452m3/hr 12.9 m head Motor 30 KW 3 Sets

2. NRV 300mm 3 No.

3. Butterfly Valve Auto 300 mm 3 No.

4. Pump 36m3/hr with motor 2.2KW 1450 rpm 3 Sets

5. NRW 150 mm 2 No.

6. Butterfly Valve 150 mm 2 No.

7. Motive Pump. Flow 6.25m3/hr

Head 89.9m 3KW Motor 2 Sets

8. Booster Pump Flow 3.9m3/hr

Head 42.5 m 1.5 KW Motor 2 Sets

9. Water Hammering System 1 No.

10. Backwash Transmitter 1 No.

J. REAGENT BUILDING (RE)

1. Mixer for Chemical (ALSO4) 2 No.



2. Dosing Pump (ALSO4) 2 No.

3. Dosing Pump (Lime) 2 No.

4. Polymer Dosing Pumps 2 No.

5. Sludge Thickening Pumps 4 No.

6. Polymer Dosing Unit 1 No.

7. Motor Driven Fork Lifter

Motor 24 Volt DC, 1200 Kg Capacity 1 No.

8. Manual Hydraulic Fork Lifter 2500 Kg 1 No.

9. MCC for Reagent Building and Chlorination Building complete unit SCADA Operated 1 Unit

10. UPS 900 Watt 1 No.

11. Hoist with Mono Rail 0.5 Ton 1 No.

K. CHLORINATION BUILDING

1. Gas Chlorination Complete Unit with Auto Control Dosing System complete with neutralization system 1 Unit

2. Gas Cylinder 1000 Kg 9 No.

3. Mono Rail with Hoist 2 Ton 1 No.

L. RECOVERY TANK (RT)

1. Penstock 600 x 1000 mm 3 Nos.

2. Mixer 5.5 KW 3 No.

3. Pumps 7.5 KW (KSB) 6 No.

4. Winches for Pump and Agitators 4 No.

5. Water Pump 2 No

6. Sludge Pump 2 No.

7. Winch 2 No.

8. 3-Phase Pneumatic Valve

65mm 24 No.

9. Motor Control Cabinet (MCC-4)

M. COLLECTION PIT BUILDING (CP)

1. KSB Pump with 40 KW Motor 2 No.

2. Crane 1 Ton 1 No.

3. Level Transmitter 1 No.

LAB

1. Equipment for Lab as per list attached



For continuous automatic monitoring units Cl2 Analyzer Treated Water Turbidity Meter pH Meter

1 No. 1 No. 1 No.

N. PUMPING STATION PS)

1. Pump (PG) Horizontal Centrifugal 997m3/hr, 35m Head 128 KW Motor with soft starter complete set 3 No.

2. Water Meter 600 mm 1 No.

3.

Mono Rail with Hoist

2 Ton 1.5 Ton

1 No. 1 No.

GENERATOR

1. Diesel engine driven generator 1000 KVAalong with auto charge over switch, can also be operated through SCADA. 1 Unit

c) Non-Revenue Water (NRW)

The city has been zoned hydraulically into 16 District Meter Zones (DMZ) and further sub-divided into

a total of 90 District Meter Areas (DMA) by fitting valves for zoning so that each zone can be

hydraulically isolated as required. The 6 zones are completely connected & monitored through SCADA

whereas the rest are partially monitored. The water flow into each zone is measured with bulk meters

and pressures controlled by Pressure Regulating Valves (PRV). Pressure is also monitored. The data

for pressure and discharge is then transmitted to a central SCADA system located in the new Jhal

Water Treatment Plant. The operator is responsible for operation & maintenance of all the installed

equipments under the NRW component of the project, in the water network of the city.



LIST OF EQUIPMENT (NRW)

Sr. No. Equipment Description Nos.

1 Electromagnetic Bulk Flow meter ‘Endress and Hauser’300mm Diameter battery operated

16 Nos

2 Electromagnetic Bulk Flow meter ‘Endress and Hauser’250 mm Diameter battery operated

16 Nos

3 Electromagnetic Bulk Flow meter ‘Endress and Hauser’200 mm Diameter battery operated

17 Nos

4 Insertion Flow meters ‘Ultraflux’ 3 Nos

5 Data Loggers ‘Sofrel’ LS42 with pressure sensor. 60 Nos

6 Pressure Regulating Valves Cla-Val 250mm – 300mm

42 Nos

7 Topkapi SCADA system 1 No



7.0 HYDRAULIC PROFILE, LAYOUT AND PROCESS DIAGRAM WTP



8. PROVIDED BY OPERATOR• To supply the un-interrupted water for the citizens

• All staff required to operate the plant up to 24 hours a day 365 days a year.

• 10 MGD of water meeting the requirements of “section 5” of this TOR based on 24 hour a day working.

• To operate the plant as per “Operation Manual” approved by the Consultant / Artelia.

• To operate the plant in the light of “HSE Plan” provided by the Client.

• Cleaning of all tanks and structures as specified in Operation and Maintenance Manual

• Availability / maintaining an inventory of all critical spares in his warehouse (accessible

to the Client), in advance at least 6-Months, during the course of the O&M period.

• Equipment Maintenance including preventative maintenance including all Spares and

Replacement equipment, after the expiry of defect liability period i.e., 14th December

2018.

• All Lubricants and filters for equipment

• During defect liability period (from 15th December 2017 to 14th December 2018) the

operator will inform / request the client at least 02-months prior to usage of any spare

parts with proper justification on need base and recent historical facts.

• The Contractor shall provide the list of spare parts along with complete details i.e.

specifications, part nos., name of manufacturer / supplier, contact of supplier & country

of origin.

• Payment of spare parts (to be used after defect liability period) shall be made on

production of original invoices.

• Contractor shall be solely responsible for running the site laboratory and maintaining

good water quality as per WHO guidelines.

• Professional Indemnity Insurance.

• Insurance for staff, workers and 3rd Parties against injury claims.

• Performance Bond

• Gardening within the boundary of the WTP plant.

• Dry sludge disposal within 10 Km of WTP on land provided by the Client.

• Manage the material store i.e Chemical section and Spare Parts section and

maintaining the spares in good health. The responsibility of any damage /loss shall lie

upon contractor.

• Maintaining fool proof security system at WTP.

• Keeping the site clean.



• Maintaining the NRW system, meant for water distribution network for the city.

• Any un-foreseen item which is necessary required for the smooth functioning of the

new Jhal WTP.

• Besides preventive maintenance, the annual maintenance will be done during the

annual canal closure schedule (i.e., in January).

9. PROVIDED BY WASA• Provision of Materials

All chemicals necessary for the operation of the plant as included in the

‘Operation Manual’ to achieve potable water, which may include:-

Aluminium Sulphate

Calcium Hydroxide (Lime)

Required approval for transportation of Chlorine Gas.

Chlorine gas including certification of storage cylinders as local

regulation.

Payment of water cost to Irrigation Department.

Sodium Hypochlorite

Sodium Hydroxide (Caustic Soda)

Cationic Polymer (Polyacrylamide cationic)

• Fuel for the generator.

• Electrical Power.

• HSE Plan

• Air Conditioned Furnished Office (01) for Operator including electrical power,

and water supply.

• Hand over WTP and NRW SCADA control room and system and take over

after successful completion of the O&M contract

• WASA will write a letter to District Authorities and local Emergency Services

to ensure that if any incidents occur in the canal upstream of the WTP intake

instructions can be passed immediately to the O&M Operator.

• Land within 10 Km radius of WTP for disposal of dried sludge from the WTP

WASA will use its best efforts to assure an adequate continuous supply of

water from the Rakh Branch Canal estimated at a maximum of 10 MGD. It is

accepted that the Rakh Branch Canal closes for a few weeks every winter for

maintenance and the Storage Lagoon which is part of the French Project will

be filled immediately before the canal closure to permit operation of the plant

during that period.



10. REPORTING REQUIRMENTSThe Operator shall prepare and submit the following reports to WASA.

Description Target

Base period:

Weekly operational report Two (2) days after the end of each week

Monthly operational report One (1) week after the end of each month

Bi-annually operational report 30 days after end of 6 month of operation

Annual operational report 30 days after end of each year of operation

All reports will be submitted in English. All documents will be submitted in both

editable electronic form and hard copies. The format of the Report shall be as set out

in the Draft Agreement.

The electronic copies of all working files shall be submitted by the Contractor in the

most recent WINDOWS based MS-Office software including WORD for text; EXCEL

for data tables and charts; appropriate MS-Office programs for exhibits; and

POWERPOINT for presentations. The O&M Operator shall also submit the reports in

PDF printable version.

WASA Faisalabad Government of the Punjab Operation and Maintenance of Jhal 10 MGD Water Treatment Plant

January 2018

6. STANDARD FORMS

• Form of Bid Security (Bank Guarantee) • Form of Contract Agreement • Form of Performance Security (Bank Guarantee/Insurance Bond) • Form of Bank Guarantee for Advance Payment


January 2018

FORM OF BID SECURITY (Bank Guarantee)

Guarantee No._____________________

Executed on _____________________ Expiry date _____________________

Name of Guarantor (Bank) with address: _________________________________________ (Scheduled Bank in Pakistan) Name of Principal (Bidder) with address: ________________________________________ _______________________________________________________________________ Penal Sum of Security (express in words and figures):_______________________________ _______________________________________________________________________ Bid Reference No._________________ Date of Bid Opening_________________________ KNOW ALL MEN BY THESE PRESENTS, that in pursuance of the terms of the Bid and at the request of the said Principal, we the Guarantor above-named are held and firmly bound unto the __________________________________, (hereinafter called the “Owner”) in the sum stated above, for the payment of which sum well and truly to be made, we bind ourselves, our heirs, executors, administrators and successors, jointly and severally, firmly by these presents. THE CONDITION OF THIS OBLIGATION IS SUCH, that whereas the Principal has submitted the accompanying Bid numbered dated as above for ________________________________________ (Particulars of Bid) to the said Owner; and WHEREAS, the Owner has required as a condition for considering the said Bid that the Principal furnishes a Bid Security in the above said sum to the Owner, conditioned as under:

(1) that the Bid Security shall remain valid for a period 28 days beyond the period of validity of the Bid;

(2) that in the event of;

(a) the Principal withdraws his Bid during the period of validity of Bid, or

(b) the Principal does not accept the correction of his Bid Price, pursuant to Sub-Clause 24.2 of Instructions to Bidders, or

(c) failure of the successful bidder to

(i) furnish the required Performance Security, in accordance with Clause 34 of Instructions to Bidders, or

(ii) sign the proposed Contract Agreement, in accordance with Clause 35 of Instructions to Bidders,


January 2018

then the entire sum be paid immediately to the said Owner as liquidated damages and not as penalty for the successful bidder's failure to perform.

NOW THEREFORE, if the successful bidder shall, within the period specified therefor, on the prescribed form presented to him for signature enter into a formal Contract with the said Owner in accordance with his Bid as accepted and furnish within twenty eight (28) days of his being requested to do so, a Performance Security with good and sufficient surety , as may be required, upon the form prescribed by the said Owner for the faithful performance and proper fulfilment of the said Contract or in the event of non-withdrawal of the said Bid within the time specified for its validity then this obligation shall be void and of no effect, but otherwise to remain in full force and effect. PROVIDED THAT the Guarantor shall forthwith pay to the Owner the said sum stated above upon first written demand of the Owner without cavil or argument and without requiring the Owner to prove or to show grounds or reasons for such demand notice of which shall be sent by the Owner by registered post duly addressed to the Guarantor at its address given above. PROVIDED ALSO THAT the Owner shall be the sole and final judge for deciding whether the Principal has duly performed his obligations to sign the Contract Agreement and to furnish the requisite Performance Security within the time stated above, or has defaulted in fulfilling said requirements and the Guarantor shall pay without objection the sum stated above upon first written demand from the Owner forthwith and without any reference to the Principal or any other person. IN WITNESS WHEREOF, the above bounden Guarantor has executed the instrument under its seal on the date indicated above, the name and seal of the Guarantor being hereto affixed and these presents duly signed by its undersigned representative pursuant to authority of its governing body.

Guarantor (Bank) Witness: Signature 1. Name Title Corporate Secretary (Seal) 2. (Name, Title & Address) Corporate Guarantor (Seal)


January 2018

FORM OF CONTRACT AGREEMENT

This OPERATION AND MAINTENANCE AGREEMENT (hereinafter called the "Agreement") is made and entered into the _____ day of _______________(month) 20_____ by and between _[Legal name, form and country of Project Owner] (hereinafter called the "Owner"), and _[Legal name, form and country of O&M firm] (hereinafter called the "Operator"). WHEREAS, Owner owns a __[Description of Project] , [Name of Project] (“Project”) and desires to contract for operation, maintenance and management of the Project, WHEREAS, Operator provides operation, maintenance and management services for Projects and has agreed to provide those services for the Project on the terms and conditions set forth in this Agreement, NOW this Agreement witnesseth as follows: 1. In this Agreement words and expressions shall have the same meanings as are

respectively assigned to them in the Conditions of Contract hereinafter referred to. 2. The following documents after incorporating addenda, if any except those parts

relating to Instructions to Bidders shall be deemed to form and be read and construed as part of this Agreement, viz:

(a) The Contract Agreement; (b) The Letter of Award; (c) The completed Form of Bid;

(d) The Particular Conditions of Contract; (e) The General Conditions of Contract; (f) The priced Schedule of Prices; (g) Completed Appendices to Bid ;

(i) The Specifications-Technical and Special Provisions (h) The Drawings;

(i) any other

3. In Consideration________________Operator Covenants________________ _____________________________________________________________

4. The Owner hereby covenants ______________________________________ ________________________________________________________________________


January 2018

IN WITNESS WHEREOF the parties hereto have caused this Agreement to be executed on the day, month and year first before written in accordance with their respective laws.. [Legal Name of Owner ] By: Witness:

------------------------------------ ---------------------------

Name: Name: Title: Address: Seal: [Legal Name of Operator] By: Witness:

------------------------------------- --------------------------- Name: Name:

Title: Address: Seal:


January 2018

FORM OF PERFORMANCE SECURITY

(Bank Guarantee/ Insurance Bond)

Guarantee No._____________________ Executed on _____________________ Expiry date _____________________

Name of Guarantor (Bank/Approved Insurance Company) with address:_________________________________________ Name of Principal (Contractor) with address: ______________________________________ ___________________________________________________________________________ Penal Sum of Security (express in words and figures) _______________________________ ___________________________________________________________________________ Letter of Acceptance No. ________________________________Dated ______________

KNOW ALL MEN BY THESE PRESENTS, that in pursuance of the terms of the Bidding Documents and above said Letter of Acceptance (hereinafter called the Documents) and at the request of the said Principal we, the Guarantor above named, are held and firmly bound unto the __________________________________________________ (hereinafter called the “Owner”) in the penal sum of the amount stated above for the payment of which sum well and truly to be made to the said Owner, we bind ourselves, our heirs, executors, administrators and successors, jointly and severally, firmly by these presents. THE CONDITION OF THIS OBLIGATION IS SUCH, that whereas the Principal has accepted the Owner's above said Letter of Acceptance for _________ __________________________________ (Name of Contract) for the _______________ _______________________________ (Name of Project).

NOW THEREFORE, if the Principal (Contractor) shall well and truly perform and fulfill all the undertakings, covenants, terms and conditions of the said Documents during the original terms of the said Documents and any extensions thereof that may be granted by the Owner, with or without notice to the Guarantor, which notice is, hereby, waived and shall also well and truly perform and fulfill all the undertakings, covenants terms and conditions of the Contract and of any and all modifications of said Documents that may hereafter be made, notice of which modifications to the Guarantor being hereby waived, then, this obligation to be void; otherwise to remain in full force and virtue till all requirements of Sub-Clause 8.7, Project Condition at End of Term,, , of Conditions of Contract are fulfilled.

Our total liability under this Guarantee is limited to the sum stated above and it is a condition of any liability attaching to us under this Guarantee that the claim for payment in writing shall be received by us within the validity period of this Guarantee, failing which we shall be discharged of our liability, if any, under this Guarantee.


January 2018

We, ____________________________________ (the Guarantor), waiving all objections and defences under the Contract, do hereby irrevocably and independently guarantee to pay to the Owner without delay upon the Owner's first written demand without cavil or arguments and without requiring the Owner to prove or to show grounds or reasons for such demand any sum or sums up to the amount stated above, against the Owner's written declaration that the Principal has refused or failed to perform the obligations under the Contract which payment will be effected by the Guarantor to Owner’s designated Bank & Account Number.

PROVIDED ALSO THAT the Owner shall be the sole and final judge for deciding whether the Principal (Contractor) has duly performed his obligations under the Contract or has defaulted in fulfilling said obligations and the Guarantor shall pay without objection any sum or sums up to the amount stated above upon first written demand from the Owner forthwith and without any reference to the Principal or any other person.

IN WITNESS WHEREOF, the above-bounden Guarantor has executed this Instrument under its seal on the date indicated above, the name and corporate seal of the Guarantor being hereto affixed and these presents duly signed by its undersigned representative, pursuant to authority of its governing body.

__________________________ Guarantor (Bank/Approved Insurance Co.) Witness: 1. _______________________ Signature _______________ _______________________ Name __________________ Corporate Secretary (Seal) Title ___________________ 2. _______________________ _______________________ _______________________ Name, Title & Address Corporate Guarantor (Seal)


January 2018

FORM OF BANK GUARANTEE FOR ADVANCE PAYMENT

Guarantee No.________________

Executed on________________ Expiry date ________________

WHEREAS _________________________________________________ (hereinafter called the Owner) has entered into a Contract for _____________________________ ________________________________________________________________________ _______________________________________________ (Particulars of Contract), with ___________________________________________________________________ ________________________________ (hereinafter called the Contractor). AND WHEREAS the Owner has agreed to given advance to the Contractor, at the Contractor’s request, an amount of _________________________________ (Rs.___________________) which amount shall be advanced to the Contractor as per provisions of the Contract. AND WHEREAS the Owner has asked the Contractor to furnish Guarantee to secure advance payment for performance of his obligations under the said Contract. AND WHEREAS __________________________________________________ (Bank) (hereinafter called the Guarantor) at the request of the Contractor and in consideration of the Owner agreeing to make the above advance to the Contractor, has agreed to furnish the said Guarantee. NOW THEREFORE the Guarantor hereby guarantees that the Contractor shall use the advance for the purpose of above mentioned Contract and if he fails, and commits default in fulfillment of any of his obligations for which the advance payment is made, the Guarantor shall be liable to the Owner for payment not exceeding the aforementioned amount. Notice in writing of any default, of which the Owner shall be the sole and final judge, as aforesaid, on the part of the Contractor, shall be given by the Owner to the Guarantor, and on such first written demand payment shall be made by the Guarantor of all sums then due under this Guarantee without any reference to the Contractor and without any objection. This guarantee shall come into force as soon as the advance payment has been credited to the account of the Contractor. This guarantee shall expire not later than ______________________________________ by which date we must have received any claims by registered letter, telegram, telex or telefax. It is understood that you will return this Guarantee to us on expiry or after settlement of the total amount to be claimed hereunder.


January 2018

_______________ Guarantor (Bank) Witness: 1. _______________________ Signature _______________ _______________________ Name __________________ Corporate Secretary (Seal) Title ___________________ 2. _______________________ _______________________ _______________________ Name, Title & Address Corporate Guarantor (Seal)

WTP OF FAISALABAD CITY

8VINCI CONSTRUCTION GRANDS PROJETS VPKOO1-VGP-00-PR-MAN-001-0 1 / 130

OPERATION & MAINTENANCE MANUAL

GOVERNMENT OF THE PUNJAB HOUSING, URBAN DEVELOPMENT AND PHE DEPARTMENT WATER AND SANITATION AGENCY, FDA, FAISALABAD

WASA Warehouse New Jhal Water Treatment Plant Samundri road Near Novelty Bridge

EXTENSION OF WATER RESOURCES FOR FAISALABAD CITY

OPERATION AND MAINTENANCE MANUAL

Engineer’s approval stamp (WASA):

Consultant’s approval stamp (ARTELIA)

5

4

3

2

1

0 2015 -11 -20 FI WGO WGO

Rev. Date Status Drawn Checked Validated Comments/Modifications

Project number

Issuer Location Trade Document Type

Sequential N°

Rev Index

Scale

Document number

WASA Warehouse New Jhal Water Treatment Plant Samundri road Near Novelty Bridge

0 0 P R M A N 0 0 0 VPK001 _ - - - V G P - 1

N/A


VINCI CONSTRUCTION GRANDS PROJETS VPKOO1-VGP-00-PR-MAN-001-0 2/ 130


EXTENSION OF WATER RESOURCES

FOR FAISALABAD CITY

WATER AND SANITATION AGENCY – FDA - FAISALABAD

William GODWIN


VPK001-VGP-00-PR-MAN-001-0 OCTOBER 2015




TABLE OF CONTENTS

1. INTRODUCTION ....................................................................................................................................... 7

2. GENERAL DESCRIPTION ............................................................................................................................ 8

2.1. PURPOSE OF THIS DOCUMENT ........................................................................................................................... 8

2.2. PRELIMINARY ................................................................................................................................................ 9

2.2.1. Definitions and Acronyms........................................................................................................................ 9

2.2.2. Design of the Water Treatment Plant ..................................................................................................... 9

3. PROCESS PHILOSOPHY PRINCIPLES ........................................................................................................ 12

3.1. MAINS STEPS PROCESS DESCRIPTION ................................................................................................................ 12

3.2. RAW WATER CANAL INTAKE ............................................................................................................................ 12

3.3. COAGULATION ............................................................................................................................................. 13

3.4. FLOCCULATION ............................................................................................................................................ 14

WTP HYDRAULIC PROFILE ........................................................................................................................................ 15

3.5. DECANTATION ............................................................................................................................................. 15

3.6. FILTRATION ................................................................................................................................................. 16

3.7. DISINFECTION .............................................................................................................................................. 17

3.8. SLUDGE DEHYDRATION ................................................................................................................................. 18

3.9. COLLECTION PIT ........................................................................................................................................... 19

3.10. WTP AIR AND WATER UTILITY’S..................................................................................................................... 20

4. WTP PROCESS FUNCTIONNAL DESCRIPTION .......................................................................................... 21

4.1. LIST OF INSTRUMENTS AND MEASURING RANGES ................................................................................................ 21

4.2. LIST OF EQUIPMENTS AND MAIN TECHNICAL CHARACTERISTICS .............................................................................. 23

4.2.1. AUTOMATIC PERMUTATION OF EQUIPMENTS ..................................................................................................... 24

4.3. TANK DIMENSIONAL AND SPECIFICATIONS ......................................................................................................... 24

4.4. RAW WATER INTAKE AND SCREENING ............................................................................................................... 27

4.5. RAW WATER TANK........................................................................................................................................ 28

4.6. RAW WATER PUMPING STATION ...................................................................................................................... 28

4.7. RAW WATER PUMPS DISCHARGE ISOLATION VALVES ............................................................................................ 29

4.8. RAW WATER ELECTROMAGNETIC FLOW METER ................................................................................................... 29

4.9. SUPERNATANT ELECTROMAGNETIC FLOW METER ................................................................................................ 29

4.10. DISTRIBUTION CHAMBER ............................................................................................................................... 30

4.11. COAGULATION – FLOCCULATION - CLARIFICATION .............................................................................................. 30

4.11.1. Compressed air service .......................................................................................................................... 32

4.12. FILTRATION UNIT .......................................................................................................................................... 33

4.12.1. Filter flow regulation ............................................................................................................................. 33

4.12.2. Filtration valves manifold description ................................................................................................... 35

4.12.3. Filter washing cycles .............................................................................................................................. 36

4.12.4. Filtered water tank ................................................................................................................................ 38

4.12.5. Backwash Air blower ............................................................................................................................. 38

4.12.6. Backwash water pumps ........................................................................................................................ 39

4.12.7. Backwash water flow meter .................................................................................................................. 39

4.12.8. Service water pumps ............................................................................................................................. 39

4.12.9. Motive water pumps ............................................................................................................................. 40

4.13. Disinfection water tank ......................................................................................................................... 41

4.13.1. Service water booster pumps ................................................................................................................ 41

4.14. TREATED WATER .......................................................................................................................................... 42




4.14.1. Treated water tank ................................................................................................................................ 42

4.14.2. Treated water pumping ......................................................................................................................... 42

4.14.3. Treated water pumps discharge relief-pressure sustaining valve ......................................................... 43

4.14.4. Treated water flow meter ..................................................................................................................... 44

4.15. SLUDGE EXTRACTION .................................................................................................................................... 44

4.15.1. Sludge extraction from clarifiers ........................................................................................................... 45

4.15.2. Sludge production from filters backwashes .......................................................................................... 46

4.15.3. Sludge recovery tanks process description ............................................................................................ 47

4.15.4. Sludge settling tanks ............................................................................................................................. 48

4.15.5. Sludge extraction from settling tanks process description .................................................................... 48

4.15.6. Sludge pit pumps process description ................................................................................................... 50

4.15.7. Supernatant pit pumps process description .......................................................................................... 50

4.16. SLUDGE DEHYDRATION .................................................................................................................................. 51

4.16.1. Sludge drying beds process description ................................................................................................. 52

4.16.2. Dried sludge removal............................................................................................................................. 53

4.17. COLLECTION PIT ........................................................................................................................................... 53

5. CHEMICAL REAGENTS PROCESS DESCRIPTION ....................................................................................... 54

5.1. Aluminium sulphate .............................................................................................................................. 55

5.1.1. Aluminium sulphate dosing pumps characteristics ............................................................................... 55

5.1.2. Aluminium sulphate tanks solution preparation ................................................................................... 55

5.1.3. Control the aluminium sulphate solution concentration ....................................................................... 56

5.1.4. Calculates the dosing pump injection flow rate .................................................................................... 56

5.1.5. AL2 mixing and dosing process control description............................................................................... 56

5.2. Lime milk ............................................................................................................................................... 58

5.2.1. Lime milk pumps characteristics ........................................................................................................... 58

5.2.2. Lime milk tank solution preparation ..................................................................................................... 58

5.2.3. Control the lime milk concentration ...................................................................................................... 59

5.2.4. Lime milk dosing rate ............................................................................................................................ 59

5.2.5. Lime of milk pumps process control description .................................................................................... 60

5.3. Chlorine gas ........................................................................................................................................... 61

5.3.1. Handling chlorine gas cylinders – safety advices .................................................................................. 61

5.3.2. Chlorine bio-chemical disinfection principle .......................................................................................... 63

5.3.3. Break-point allows to calculates the chlorine gas dosing rate .............................................................. 64

5.3.4. Chlorine gas storage building, dosing, neutralization room, and chlorine gas leak detection .............. 65

5.3.5. Chlorine gas dosing regulation description ........................................................................................... 65

5.3.6. Chlorine gas dosing and injection principle ........................................................................................... 66

5.3.7. Chlorine gas dosing equipments description ......................................................................................... 68

5.4. Caustic soda .......................................................................................................................................... 71

5.4.1. Chlorine gas neutralization tower chemical process description .......................................................... 71

5.4.2. Caustic soda neutralization tank solution concentration ...................................................................... 72

5.4.3. Cl2 gas neutralization process description ............................................................................................ 73

5.5. Polymer ................................................................................................................................................. 74

5.5.1. Polymer equipments .............................................................................................................................. 74

5.5.2. Polymer flocculation dosing pumps characteristics .............................................................................. 74

5.5.3. Polymer sludge conditioning dosing pumps characteristics .................................................................. 75

5.5.4. Polymer solution preparation ................................................................................................................ 76

5.5.5. Calculates the dosing rate ..................................................................................................................... 78

5.5.6. Adjustments of the water dilution ......................................................................................................... 78

5.6. Estimation of the annual consumption of reagents on the WTP ........................................................... 78




6. WATER ANALYSIS ................................................................................................................................... 79

6.1. WTP ONSITE WATER ANALYSES ....................................................................................................................... 79

6.2. EXTERNAL LABORATORY ANALYSIS ................................................................................................................... 79

6.3. WTP CURRENT ANALYSIS DESCRIPTIONS ........................................................................................................... 80

7. ELECTRICAL POWER PLANT SUPPLY ....................................................................................................... 82

7.1. POWER SUPPLY 1 AND ELECTRICAL NETWORK .................................................................................................... 82

7.2. GENERATOR - POWER SUPPLY SOURCE 2 ........................................................................................................... 83

7.3. POWER BALANCE ......................................................................................................................................... 84

7.4. 230VAC UNINTERUPTIBLE POWER SUPPLY ...................................................................................................... 84

8. WTP OPERATION INSTRUCTIONS ........................................................................................................... 85

8.1. DAILY OPERATIONS ....................................................................................................................................... 85

8.2. OPERATIONS LOGBOOK & WTP ADJUSTMENTS .................................................................................................. 86

8.3. Select 1 + 2 Lines of treatment .............................................................................................................. 86

8.4. START / STOP THE PLANT ............................................................................................................................... 87

8.4.1. Standard start up procedure ................................................................................................................. 87

8.4.2. AUTOMATIC START ....................................................................................................................................... 88

8.4.3. AUTOMATIC STOP ........................................................................................................................................ 88

8.4.4. MANUAL MODE ........................................................................................................................................... 89

9. CONTROL COMMAND FROM PLC SUPERVISION ..................................................................................... 95

9.1. AUTOMATIC SCREEN MONITORING .................................................................................................................. 95

9.2. RAW WATER PUMPING MONITORING ............................................................................................................... 95

9.3. COAGULATION – FLOCCULATION - CLARIFICATION MONITORING ............................................................................ 95

9.4. FILTRATION AND WASHING MONITORING .......................................................................................................... 95

9.5. FILTERED WATER PUMPING MONITORING .......................................................................................................... 95

9.6. TREATED WATER DISTRIBUTION MONITORING .................................................................................................... 95

9.7. COLLECTION PIT MONITORING ........................................................................................................................ 95

9.8. COAGULATION CHEMICAL TREATMENT MONITORING ........................................................................................... 95

9.9. POLYMER CHEMICAL TREATMENT MONITORING .................................................................................................. 95

9.10. LIME CHEMICAL TREATMENT MONITORING ........................................................................................................ 95

9.11. DISINFECTION CHEMICAL TREATMENT MONITORING ............................................................................................ 95

9.12. CHLORINE GAS NEUTRALIZATION MONITORING ................................................................................................... 95

9.13. CLARIFIER SLUDGE SEQUENCES OF EXTRACTION MONITORING ................................................................................ 95

9.14. SETTLING TANKS SLUDGE SEQUENCES OF EXTRACTION MONITORING ....................................................................... 95

9.15. DRYING BED FILLING AND EMPTYING MONITORING .............................................................................................. 95

10. WTP MAINTENANCE INSTRUCTIONS ...................................................................................................... 96

Existing hazards and safety procedures ................................................................................................................ 96

10.1. Automatic screening.............................................................................................................................. 97

10.2. TANKS AND MIXERS ...................................................................................................................................... 97

10.2.1. LIME MILK TANKS ................................................................................................................................. 97

10.3. LAMELLAR CLARIFIER ..................................................................................................................................... 97

10.4. FILTERS ...................................................................................................................................................... 98

10.5. Pumps – air blower - compressor .......................................................................................................... 98

10.6. Chlorine ................................................................................................................................................. 99

10.7. POLYMER PREPARATION .............................................................................................................................. 100

10.8. DRYING BEDS ............................................................................................................................................ 100

10.9. INSTRUMENTATION .................................................................................................................................... 101




10.10. ELECTRICAL CABINETS .......................................................................................................................... 102

11. TROUBLE SHOOTING CHART ................................................................................................................ 103

11.1. BAD CLARIFICATION .................................................................................................................................... 103

11.2. SHORT FILTRATION CYCLES ........................................................................................................................... 103

11.3. LOSS OF SAND MEDIUM ............................................................................................................................... 103

11.4. FILTERED WATER BAD QUALITY ...................................................................................................................... 104

11.5. EXCESSIVE VOLUME OF SLUDGE ..................................................................................................................... 104

11.6. AIR SERVICE ALARM .................................................................................................................................... 104

11.7. CL2 GAS ALARM ......................................................................................................................................... 104

11.8. WTP PRODUCTION SHUT DOWN ................................................................................................................... 104

11.9. 104

11.10. .............................................................................................................................................................. 104

11.11. LIST OF ALARMS ................................................................................................................................. 104

12. JAR TEST .............................................................................................................................................. 105

12.1. JAR TEST TRIAL PURPOSE .............................................................................................................................. 105

12.1.1. Jar test trials using chemical solutions ................................................................................................ 105

12.1.2. Aluminium sulphate solutions ............................................................................................................. 107

12.1.3. Lime of milk solutions .......................................................................................................................... 108

12.1.4. Cationic polymer solution .................................................................................................................... 109

12.1.5. Anionic polymer solution ..................................................................................................................... 110

12.1.6. Chlorine solutions ................................................................................................................................ 111

12.2. JAR TEST TRIALS ..................................................................................................................................... 112

12.2.1. Jar test trials data sheet ...................................................................................................................... 112

12.2.2. Jar test procedure ................................................................................................................................ 114

12.2.3. PH of flocculation ................................................................................................................................ 115

12.3. WATER CHLORINATION DEMAND ................................................................................................................... 116

12.3.1. Purpose ................................................................................................................................................ 116

12.3.2. Requested equipments ........................................................................................................................ 116

12.3.3. Preparation of solution ........................................................................................................................ 116

12.3.4. Disinfection dosing rate ....................................................................................................................... 116

13. ANNEXES ............................................................................................................................................. 117

13.1. DS - ANALOGICAL INSTRUMENTS .................................................................................................................. 117

13.2. DS - LOGICAL INSTRUMENTS ........................................................................................................................ 117

13.3. DS - PUMPS.............................................................................................................................................. 117

13.4. DS - AIR UTILITIES ...................................................................................................................................... 117

13.5. DS - MIXERS ............................................................................................................................................. 117

13.6. DS – VSD’S ............................................................................................................................................. 117

13.7. DS - VALVES ............................................................................................................................................. 117




1. INTRODUCTION

This manual provides the "Operating Instructions" of the new water purification plant of Faisalabad city.

The drinking water treatment plant consists of a Unit capacity of average 2000 m3/h. The performances

of this plant are used to meet the standards of the Code of Health (WHO); according to compliance with

appropriate treatment rates as much as the raw water characteristics do not undergo major change.

This manual presents the different equipments, describes the characteristics and conditions of functioning, as well as the safety conditions, and provides the trouble shooting chart and the maintenance instructions of the major equipments installed. In addition, a final section relative with the chemistry of water, details the basic principles of experimental protocols for determining the optimal water treatment dosing rates. This manual bears the operating instructions issued by the suppliers of equipment which are included in

the suppliers documentation includes in the workbook.

It is imperative to follow the instructions detailed in this manual and the technical specification data

sheets of the workbook.

The WTP operations should be performed by trained and skilled staff, which carefully read and

understood these instructions.

VINCI is not responsible for the possible consequences of non-compliance with instructions in this

manual as well as the instructions and recommendations provided in the supplier’s technical

documentations.




2. GENERAL DESCRIPTION

2.1. Purpose of this document

This operating manual is intended to guide the operator to the exploitation and the production of daily

drinking water.

This document synthesizes the equipment technical data’s provided by the suppliers in the Technical

transmitted workbook. It is imperative to follow the detailed instructions given in this manual as well as

the equipments supplier’s technical documentations.

This document is not an exhaustive presentation of all actions to achieve, but it brings together the important steps for the proper use of the treatment plant. The physical and chemical principles met in this unit are presented in this document.

In addition and for a good understanding please refer to the followings:

The Process drawings (VPK001-DTE-ST-PR-DWG-001 to 014 at the latest index), The functional analysis (VPK001-ACT-00-ELEC-FAL-207-at the latest index) The automation operation manual (VPK001-DTE-00-PR-TEN-008 at the latest index) The supervision screen operation manual (VPK001-ACT-00-ELEC-MAN-209 at the latest index) The supplier technical documentations The suppliers equipments and instruments operation and maintenance recommendations

Important Recall: In case of none ordinary situation and/or operator’s misunderstood situation, activity should CEASE and team leader immediately informed. Before any starting, verify that the corresponding electrical and hydraulic circuits including manual and automatic valves are in the good positions Before any handling/using of chemical reagent or electro-mechanical apparatus please consult the dedicated MSDS and/or technical data sheets and safety data sheets. In case of faults or any intervention, always refer to the vendor instructions. Electrical circuit breakers logging must always be carried out before any maintenance on electrical equipments. Wearing personal protective equipment is mandatory for any works




2.2. Preliminary

2.2.1. Definitions and Acronyms

In order to avoid any confusion, definitions of the main used words in this manual are given here under; RW- Raw Water: water from canal inlet plant Supernatant: water issued from WPT processing and blended with raw water Conditioned Water: raw water conditioned with chemical in coagulation tank (polymer not included) FLW- Flocculated Water: water outlet the flocculation tanks CW- Clarified Water: water outlet the lamellar clarifiers CE- Concrete canal: clarified water distribution canal to filters FW- Filtered Water: water outlet the rapid gravity sand filters FWT – filtered water tank DWT – disinfection water tank TW- Treated Water: filtered and disinfected water for the distribution to the WASA city network TWT – treated water tank SW- Service Water: filtered water used to SWB- Service water booster: disinfected water used to: MW- Motive water: Water pumping dedicated for the chlorine injection RCE- Remnant chlorine effect: allows treated water to keep away from biologic contamination SCADA – Supervisory Control and Data Acquisition PLC – Programmable logic controller / supervision MSB – Main Switch Board MCC – Motor Control Command CP – Collection pit ST – Sludge settling tank

2.2.2. Design of the Water Treatment Plant

The WTP is designed to reinforce the drinking water production capacity of Faisalabad city. Parameters of treated water are the followings: The treated water quality here under described is dependant of the raw water quality inlet plant.

New JHAL WTP Inlet Outlet average maxi Unit

Design capacity 10.5 10 MGD 47,856 45,456 m3/h Operating condition 24 24 H Nominal flow rate 1,994 1,894 m3/h Turbidity 250 1.0 230 686 NTU pH 6.5-8.5 Colour ≤15 u Aluminium 0.2 mg/l Escherichia coli absence Coli forms thermo tolerant absence




PLANT GENERAL OVERVIEW

Raw water intake RW 0,050m screening RW automatic 0,010m fine screening RW pumping x3 RW electromagnetic flow meter Supernatant electromagnetic flow meter Distribution tank x1 + on line Ph & turbidity analysers Coagulation tank x2 with coagulant injection’s Flocculation tank x2 with polymer injection’s + on line pH analysers Flocculation pH adjustment using lime milk if necessary Lamellar clarifier x4 CW channel with + on line Ph & turbidity analysers CW pH correction / mineralization using lime milk if necessary Rapid gravity sand filter x8 FW mineralization using lime milk according with calcium-carbonates equilibrium Filtered water tank + Backwash pump X3 + Service water pump X2 + booster pump x2) Disinfection tank + motive pump x2 Treated water tank + on line Cl2 & Ph & turbidity analysers TW pump x3 + TW electromagnetic flow meter + pressure regulation valve TW distribution to the city network

Backwash water and sludge extraction

Backwash water + BKW electromagnetic flow meter Collection of backwashed water from the sand filters Collection of extracted sludge from clarifiers Daily capacity of storage in Recovery tanks x3 Sludge settling tanks x3 Supernatant pit pump x2 (recycling of Backwash Water)

Steps of the sludge treatment

Automatic sludge extraction from settling tanks Sludge pit pump x2 (to drying beds) Sludge drying beds x8

Water overflows

Clarified water channel Overflow Filtered water tank Overflow Treated water tank Overflow Supernatant pit Overflow Collection pit pump x2 to canal

Chemical buildings

Storage and solution preparation of Aluminium sulphate + Lime milk + polymer Storage and dosing of chlorine gas + chlorine gas leak neutralization workshop

Administrative building

On site laboratory and PLC control room


8VINCI CONSTRUCTION GRANDS PROJETS VPKOO1-VGP-00-PR-MAN-001-0 11 / 130





3. PROCESS PHILOSOPHY PRINCIPLES

3.1. Mains steps process description On this unit we use the following physical / chemical and bio-chemical principles;

Step 1: Raw water intake – Water on line analyse

Step 2: Coagulation - Flocculation – Decantation

Step 3: Filtration - Mineralization

Step 4: Disinfection

Step 5: Distribution- Water on line analyse

Step 6: Sludge treatment – dehydration

3.2. Raw water canal intake Raw water intake hydraulic profile

Water from canal gravidity enters into the plant passing through two selective sieves in order to retain materials greater than 0,050m and 0,010m that water could be carry on. Materials greater than 0,010m will be extracted by an auto screen to a dedicated skip. Screened water flows into the raw water tanks equipped with 3x997 m3/h pumps. Raw water is counted by an electromagnetic flow meter before to enter into the coagulation tanks.




3.3. Coagulation In liquid media and more particularly aqueous media, organic and inorganic materials are present in dissolved and solid form. These two forms are distinguished by the size of the particles. Dissolved compounds are:

Inorganic compounds, ions and/or organic compounds of low molecular weight with a particle size of at most 10 -3 µm;

Soluble organic compounds of high molecular weight, such as proteins or polymers, with a slightly larger particle size of between 10 -3 and 10 -2 µm.

Solid compounds are:

Colloids with a particle size of between about 10 -2 and 1 µm;

Solids in suspension with a particle size of more than 1 µm. Coagulation leads to destabilize the suspended solids (SS) and colloids to promote their

agglomeration

The colloids destabilization depends of two types of active forces; (VA): Attractive force of Vander-Waals linked with the geometrical structure and form of colloids therefore with the water medium. (VR): Repulsive electrostatic force linked with the colloids surface electrical charges The total energy of colloids is: E = VA + VR (ES): Energy of colloids suspension stability To allow the destabilization of the suspension, it’s necessary to neutralize VR. It’s the focus of Coagulation effect

Destabilization of colloids suspension When metallic aluminium salts are injected into water at a calculated dose, a fast reaction of colloids precipitation will occur. It is the coagulation. The coagulation optimal corresponds with a minimal Zeta potential;




Zeta potential Colloids and SS contents are generally electrically negative charged and together repulsing. To neutralize these charges, we add cationic ions which create an energetic layer that isolate particle. In our plant, at pH comprising between 6, 5 to 8, 5 the Aluminium sulphate provides cationic charges which reduce the zeta potential. The coagulation is effective when zeta potential is neutralized. It is important do not overdosing coagulant and inverse the zeta potential, so the colloids are going to destabilize again. We perform the JAR TEST trials in Lab in order to define the good dosing rate of coagulant. Lime addition may be necessary to adjust the pH if this is below the coagulation pH (below 6.5).

3.4. Flocculation

Flocculation is the destabilization of a hydrophobic colloidal suspension by bonding between colloidal particles using long polymer chains. This requires the use of polymers with a high molecular weight (greater than 1 million) and takes place in two main steps: flock initiation and flock growth. The agglomeration of colloids and suspended solids requires a slow stirring to bring together the flocks formed by coagulation. The pH of the solution has a direct effect on the behaviour of the polymer chains. It can also have other effects: Adjusting the pH of the solution allows metal hydroxides to be precipitated, and these may directly interfere with flocculation, for example by capturing the colloids. Hydrolysis, and therefore the ionic charge of the polymer, depends on the pH. Strongly anionic polymers are very effective in basic medium, but their performance is not as good in acid medium because the carboxylate/carboxylic functional groups do not dissociate in such a medium. The temperature of the solution directly influences the kinetics of the reactions involved and the activity of the colloids. Thus, lowering the temperature reduces flocculation. Influence of the organic nature of the suspension A final important factor regarding the suspension is its organic nature. In general, the more organic the nature of the suspension is the greater the cationicity of the polymer is effective. Conversely, anionic polymers are more effective in inorganic solutions.




WTP hydraulic profile

3.5. Decantation Decantation is the step of separating the flocks formed during the previous steps from water. The lamellar plates improve the decanter’s available surface and the flocks are settling into the truncated cones at the bottom, then the sludge is regularly and automatically extracted from the decanters. Characteristics of flocks SEPARATION CHARACTERISTICS OF THE FLOCKS

SEDIMENTATION DENSE, STRONG, LARGE, UNIFORM SHAPE, MINIMAL POROSITY

FILTRATION POROUS, STRONG, PERMEABLE

Major operating parameters to maintain;

Continuous and stable flow Constant elevation speed (Hazen speed) Sludge extraction sequences in correspondence with water turbidity and TSS contents




3.6. Filtration Suspended solids in water passing through filters medium are retained within the sand medium particles interstices, over the greater part of the sand medium high. The retention of solids and organics contents causes a gradual blockage of the interstices. This phenomenon induces the "clogging of the filter." Quality and flow of water passing through an excessively clogged filter strong decline due to "puncture" of the filter. The different phases of clogging of a filter are illustrated below:

P2: loss of charge maximal acceptable a: loss of charge evolution in time b: turbidity evolution in time

c: temporary leak of TSS at the restart of filtration d: filter puncture point e: turbidity acceptable limit point

Before the filter puncture point is reached which is controlled by the sand medium loss of charge constant survey, an automatic backwash demand shall be required by the Programmable Logic Controller WTP monitoring. Frequency of backwashes cycles depends mainly on the water TSS concentration, on the flow rate, and as well as the particles sizing and the porosity of the sand medium. During the backwashing cycle phases, the filter is isolated from the production. Washing is performed with air and water at the counter sense. Backwash water concentrated with sludge is sent to recovery tanks to undergo a treatment before to be partially returned to upstream plant. At the end of backwashing the filter automatically return to a new cycle of production.

Loss of charge in a filter (in cm)

Turbidity of filtered water

Time

Time




3.7. Disinfection Some micro-organisms in the water are pathogenic, means they are harmful to humans. Among these organisms there are viruses, bacteria’s and parasites. Disinfection is the oxidative destruction of these organisms in the water. The dosing of chlorine at the break point is adjusted to allow the oxidation of the mineral and organic parts of nitrogen. It also allows the elimination of chlorine + amines compounds responsible for bad taste and to precisely determinate the water residual free chlorine dosing-rate. The dosing of chlorine at the break point allows to disinfect water and to get a free chlorine residual concentration that prevents organic to grow in the tanks and in the distribution pipe network. Chlorination circuit diagram




3.8. Sludge Dehydration Sludge treatment principle

The sludge treatment including six (6) main steps; I -Sludge flow rate and volume management using 3 recovery tanks equipped with pumps and mixers II - Sludge thickness step performed using 3 settling tanks associated with a polymer injection III - Return of water to upstream WTP via 1 supernatant pit equipped with 2 pumps IIII – Transfer of sludge using 1 sludge pit equipped with 2 pumps V – Sludge dehydration VI - Sludge removal from plant The use of polymer offers to sludge dehydration optimising duration times as follow:

o It reduces the duration time of water/sludge separation in the drying beds. o It reduces the duration time for the crevices drought to appear in the drying beds.

(This will takes 2 to 3 days instead of 1 week without polymer conditioning) and thus allows to reduce impact of rainy days on the sludge’s dehydration. (Crevices drought increases the draining capacity of rainfall water passing through medium beds).

Sludge treatment hydraulic profile

Recovery tanks Produced backwash water from filtration unit and sludge from clarification are routed into the recovery tanks before conditioning and recycling. It is the first step of reducing the volume of sludge to be treated. Settling tanks Discharged muddy water from recovery tanks to settling tanks is kept in residence adjustable time, in order to give sludge time to settle to the bottom and increasing thickness while the supernatant is spilling out from ST to supernatant pit pumps.




The thickness increasing by static decantation is helped by an appropriate polymer injection dosing rate. Muddy water concentration in the recovery tanks is expected about 6 - 7 g/l. Drying beds

Drying beds allows to directly obtaining, by filtration / draining, under gravidity pressure, and according with favourable meteorological conditions, important sludge dryness. Drying phase is linked to the climatology and more particularly to the rainfall. The design of the drying surfaces is (8 x 675 m² drying beds) to allow a sludge dryness of a minimum 11 % up to …40%. It is important to remark that, under dry climate (< 600mm / year), 40% sludge dryness can be reached. Sludge drying bed drawing

3.9. Collection pit Collection pit is the final step for waste water routing on the plant. From this, water shall be returned to the canal downstream the RW canal intake.




3.10. WTP Air and Water Utility’s Without suppressed air and compressed air it is not possible to produce water. Air utilities are supplied on site by the following equipments;

o Two (2) air blowers are dedicated for the filter backwashing o One (1) double air compressor is providing air for the pneumatic valves opening/closing o One (1) air dryer for the removal of water from atmospheric air

Without service waters workshops it is not possible to produce water. Service water pumping workshops are indispensable for the WTP to produce water Water utilities are supplied on site by the plant itself so as a part of the water production. According with the different uses of service water four (4) circuits are supplying water at specifics flow rates and working pressures to separated circuits.

o Service water o Service water booster o Motive water o Backwash water




4. WTP PROCESS FUNCTIONNAL DESCRIPTION

4.1. List of instruments and measuring ranges

Tag number Analogical Flow-meter ND mm mini maxi Unit

CB-FIT-100 Supernatant flow-meter 200 0 300 m3/h CB-FIT-101 Raw water flow-meter inlet WTP 600 0 2500 m3/h HO-FIT-001 Backwash filter water flow-meter 400 0 1500 m3/h TW-FIT-001 Treated water flow-meter outlet WTP 600 0 3000 m3/h

Tag number Analogical Ultrasonic level mini maxi Unit

RW-LT-001 Raw water screen in/out differential level 0 cm RW-LT-002 Raw water pumping tank level 0 470 cm HO-LT-001 Filtered water tank level 0 250 cm AC-LT-001 Treated water tank level 0 500 cm CP-LT-001 Collection pit water level 0 400 cm

Tag number Analogical Water analyzer mini maxi Unit

CB-AIT-100 Raw water pH 2 12 _ CB-AIT-101 Raw water turbidity 0 1000 NTU CC-AIT-100 Coagulated water pH file 1 2 12 _ CC-AIT-300 Coagulated water pH file 2 2 12 _ CD-AIT-101 Clarified water pH 2 12 _ CD-AIT-102 Clarified water turbidity 0 50 NTU AC-AIT-001 Treated water turbidity 0 10 NTU AC-AIT-002 Treated water pH 2 12 _ AC-AIT-003 Treated water Cl2 free concentration 0 5 ppm Cl2

Tag number Analogical process control mini maxi Unit

HE-PIT-001 Air blower discharge pressure 0 1 bar HE-TIT-001 Air blower room temperature 0 100 °C TW-PIT-001 Treated water discharge pressure control 0 6 bar GE-LT-001 Polymer solution tank level 0 60 cm

Process control equipments and measuring ranges

Tag number Pressure & flow process control mini maxi Unit

CB-VA-103 Raw water inlet WTP 0 1994 m3/h HF-PI-002 Compressed air pressure control 4.0 6 bar HD-PSH-003 SW - water discharge high pressure 0.5 1.5 bar HD-FI-007 SW - Aluminium tanks filling water flow control 0 10000 l/h HD-FI-008 SW - Lime tanks filling water flow control 0 10000 l/h HD-CD-002 SWB – polymer dilution water cartridge filter HD-FI-001 HD-VA-002 HD-VD-004 GE-VM-005

SWB - Flock tank 1 polymer dilution flow control SWB - Flock tank 1 dilution water valve control SWB - Flock tank 1 dilution pressure valve control SWB - Flock tank 1 injection pressure valve control

0 2500 l/h




HD-FI-002 HD-VA-003 HD-VD-005 GE-VM-006

SWB - Flock tank 2 polymer dilution flow control SWB - Flock tank 2 dilution water valve control SWB - Flock tank 2 dilution pressure valve control SWB - Flock tank 2 injection pressure valve control

0 2500 l/h


SWB - ST 1 polymer dilution flow control SWB - ST 1 dilution water valve control SWB - ST 1 dilution pressure valve control SWB - ST 1 injection pressure valve control

0 250 l/h



0 250 l/h



0 250 l/h

HD-CD-001 HD-FI-006 HD-VD-003

SWB – Polymer POLYDOS 412 water cartridge filter SWB – Polymer POLYDOS 412 water flow control SWB – polymer POLYDOS 412 water pressure control

0

800

l/h

HO-FI-002 HO-VD-001 HO-EV-001

MW - Water flow control MW - water pressure control valve MW - water valve control

0 6000 l/h

TW-VC-001 Discharge relief pressure & flow regulation valve 2 3 bar

Tag number Chlorine gas process control mini maxi Unit

GL-II-001 Cl2 storage room gas leak detection 0 10 ppm Cl2 GL-II-002 CL2 in water dosing regulation analyzer 0 5 ppm Cl2 GL-II-003 Cl2 dosing room gas leak detection 0 10 ppm Cl2 GL-II-004 CL2 change over equipment vacuum pressure -0 -1 bar GL-WE-001 CL2 file 1 drums weight 0 4000 kG GL-WE-002 CL2 file 2 drums weight 0 4000 KG GL-VA-001 CL2 file 1 drums isolation valve Close Open GL-VA-002 CL2 file 2 drums isolation valve Close Open GL-VA-008 CL2 gas dosing regulation valve 0 100 % open GL-FI-001 CL2 gas flow meter 0.5 10 kg/h HO-FI-002 Water of chlorine flow control 3000 6000 l/h GL-PRV-001 new GL2 gas file 1 pressure regulation valve 1.5 2 KG GL-PRV-002 new GL2 gas file 2 pressure regulation valve 1.5 2 KG GL-TT-001 CL2 storage room temperature controller 15 45 °C CL2 gas cylinder weight 700 1600 KG CL2 gas cylinder internal pressure 0 20 bar

Tag number CL2 Neutralization Process control qty m3/h WCm kW V Hz VSD

GL-CN-005 Cl2 gas extraction fan 1 2000 0.2 4 400 50 No GL-PC-001 Soda circulating pump 1 8 8.5 2.2 400 50 No




4.2. List of equipments and main technical characteristics

AUTOSCREEN PACKAGE

Tag number description qty m3/h sieving kW V Hz VSD RW-SF-001 Automatic fine screen 1 2997 10mm 400 50 Y RW-ZB-001 Waste discharge skip 2

WATER PUMPING

Tag number description qty m3/h WCm kW V Hz VSD RW-PC-001/2/3 RW submersible pumps 3 994 11.5 55 400 50 Y HD-PC-001/2 Service water booster pump 2 3,90 42.5 1.1 400 50 No HD-PC-003/4 Service water pump 2 36 10 2.2 400 50 No HO-PC-001/2/3 BKW filter pump 3 458 12.9 30 400 50 Y HO-PC-004/5 Motive water pump 2 6.35 89.8 3 400 50 No TW-PC-001/2/3 Treated water pump 3 947 35 128 400 50 Y HE-PC-001 Pumping room sump pit pump 1 10 8 0.7 230 50 No CP-PC-001/2 Collection pit pump 2 997 10.2 40 400 50 Y EB-PC-100 to 301 RT submersible pumps 6 110 8.2 7.5 400 50 No ED-PC-102/103 Supernatant pit pump 2 100 11 5.5 400 50 No

SLUDGE PUMPING

Tag number description qty m3/h WCm kW V Hz VSD ED-PC-100/101 Sludge pit pump 2 100 4.5 2.6 400 50 No

MIXER

Tag number description qty m3/h kW V Hz VSD CB-AA-100/300 Coagulation tanks 2 1.5 400 50 No CC-AA-100/300 Flocculation tanks 2 1.1 400 50 Y GR-AA-100/200 Lime tanks 2 1.5 400 50 No GB-AA-100/200 Aluminium tanks 2 1.5 400 50 No EB-AA-100/200/300 Recovery tanks 3 5.5 400 50 No

CHEMICAL PUMPING

Tag number description qty m3/h WCm kW V Hz VSD GR-PC-001/2 Lime milk circulating pump 2 3 40 1.5 400 50 No GB-PV-100/200 Aluminium to coagulation 2 0.525 30 0.6 400 50 Y GE-PV-001/2 Polymer to flocculation 2 0.249 30 0.6 400 50 Y GH-PV-001/2/3 Polymer to sludge treatment 3 0.052 80 0.2 400 50 No

AIR UTILITY’S

Tag number description qty m3/h WCm kW V Hz VSD HE-CA-001/2 Air blower 2 2500 5.8 75 400 50 Y HF-CC-001/2 Air compressor 2 30 100 4 400 50 No HF-RV-001 Air compressed tank 1 _ 160 _ _ _ _ HF-SV-001 Capacitive drain valve 1 _ 160 _ 230 50 No HF-ZP-002 Air dryer 1 33 150 0.5 230 50 No




4.2.1. Automatic permutation of equipments

Running motors, pumps, air blowers, compressors etc… are automatically permutated at each start/stop in order to equilibrate the working time of all the installed equipments including spares. In case of the selected pump doesn’t start the following pump available shall start

4.3. Tank dimensional and specifications

Tanks water positive security floating levels management

LSH LSL LSLL

0 1 1

1 0 0

WATER TANKS DIMENSIONNAL & WATER LEVEL CONTROL

Tag number description qty m3 ID(m) m² H(m) W(m) L(m) RW Raw Water Tank 1 285 _ 60 4.75 6 10 RW-LSH-001 level adjustment 1 4.75 RW-LSL-001 Level adjustment 1 2.5 DC Distribution chamber 1 53.3 _ 20 2.61 6.8 3 CB Coagulation tank 2 27.6 _ 10.6 2.61 3.4 3.25 CC Flocculation tank 2 382 _ 67.8 5.63 7.75 8.75 CD Lamellar clarifier 4 280.6 _ 63.9 4.39 5.5 13.1 CE CW distribution canal 1 CE-LSH-100 Level adjustment 1 0.6 FI Gravity Sand Filter 8 87.5 _ 45.8 1.91 4.0 8.66 HO Filtered Water Tank 1 416 _ 161 2.5 22.12 7.29 HO-LSH-001 Level adjustment 1 2.4 HO-LSL-001 Level adjustment 1 0.5 HO Disinfection tank 1 1012 _ 440 2.3 22.12 19.9 HO-LSL-002 Level adjustment 1 0.5 AC Treated Water Tank 1 5655 40 1257 4.5 _ _ AC-LSH-001 Level adjustment 1 4.5 AC-LSL-001 Level adjustment 1 1.0 CP Collection pit 1 56.55 6 28.3 5.0 _ _ CP-LSH-001 Level adjustment 1 3.0 CP-LSL-001 Level adjustment 1 0.7

CLARIFIER 1-2-3-4 – SLUDGE EXTRACTION VALVES

Tag number description qty ND kW V Hz VSD CD-VA-100 to 105 Sludge valves clarifier 1 6 150 0.5 230 50 No CD-VA-200 to 205 Sludge valves clarifier 2 6 150 0.5 230 50 No CD-VA-300 to 305 Sludge valves clarifier 3 6 150 0.5 230 50 No CD-VA-400 to 405 Sludge valves clarifier 4 6 150 0.5 230 50 No




SLUDGE RECYCLING TANKS DIMENSIONNAL

Tag number description qty m3 ID(m) m² H(m) W(m) L(m) EB Recovery tank 3 474 _ 225 4.3 11 20.5 EB-LSH-100/200/300 Adjusted elevations 3 2.0 EB-LSL-100/200/300 Adjusted elevations 3 1.2 EB-LSLL-100/200/300 Adjusted elevations 3 0.5 ED Settling tank 3 300 _ 114 2.65 11 10.5 EG Drying bed 8 1080 _ 675 1.6 15 45 ED Sludge pit 1 12 _ 5.3 2.25 1.9 2.8 ED-LSH-101 Adjusted elevations 1 1.6 ED-LSL-101 Adjusted elevations 1 0.8 ED Supernatant pit 1 12 _ 5.3 2.25 1.9 2.8 ED-LSH-102 Adjusted elevations 1 1.6 ED-LSL-102 Adjusted elevations 1 0.8

SETTLING TANK 1-2-3-4 – SLUDGE EXTRACTION VALVES

Tag number description qty ND kW V Hz VSD ED-VA-100 to 160 Sludge valves ST 1 7 65 0.5 230 50 No ED-VA-200 to 260 Sludge valves ST 2 7 65 0.5 230 50 No ED-VA-300 to 360 Sludge valves ST 3 7 65 0.5 230 50 No

CHEMICAL TANKS DIMENSIONNAL & LIQUID LEVEL CONTROL

Tag number description qty m3 ID(m) m² H(m) W(m) L(m) GL-RV-001 Neutralization tank 1 11.6 _ 8.3 1.4 2.6 3.2 GL-LSL-001 Adjusted elevations 1 0.5 GL-LAL-001 Adjusted elevations 1 1.1 GL-DC-001 Neutralization tower 1 2.82 1.20 1.1 3.88 _ _ GR Lime milk tank 2 19.8 _ 9.0 3.3 3.0 3.0 GR-LSHH-101/201 Adjusted elevations 2 2.7 GR-LSH-101/201 Adjusted elevations 2 2.5 GR-LSL-101/201 Adjusted elevations 2 0.5 GB Al2 sulphate tank 2 15.4 _ 7.0 3.3 2.6 2.6 GB-LSHH-101/201 Adjusted elevations 2 2.7 GB-LSH-101/201 Adjusted elevations 2 2.5 GB-LSL-101/201 Adjusted elevations 2 0.5 GE Polymer volume total 1 1.308 _ 2.3 .60 1.2 1.93 GE Polymer maturation 2 0.450 _ .75 .60 1.2 .625 GE Polymer pumping 1 0.408 _ .81 .50 1.2 .680

TROLLEY & HOIST

Electrical description qty KG kW V Hz VSD GL-TP-002+003 CL2 storage room 1 2000 400 50 No GL-TP-004 Hoist lifting weight controller 1 2000 GB-TP-102 RB mobile Forklift 1 Manual description qty KG Lifting chain shackle RW-TP-001/2/3/4 RW pumping room 2 yes yes GR-TP-001+002 Reagent Building 1




GB-TP-100 RB mobile hoist 1 EB-TP-100/200/300 Recovery tanks pumps 3 ED-TP-107+103 Recovery tanks mixers 1 ED-TP-106+101 Sludge + supernatant pit 1 HO-TP-001/2/3/4 Filtered water tank 2 TW-TP-001/2 TW pumping room 1 CP-TP-001 Collection pit 1

FAN AIR EXTRACTION

Tag number description qty m3/h kW V Hz VSD RW-CN-00 RW pumping station 1 400 50 No RW-YS-001 Air filter 1 CE-CN-001 Filters gallery 1 400 50 No HE-CN-001 Air blower room 1 400 50 No HE-YS-001 Air filter 1 GB-CN-001/2 Reagent building 2 400 50 No GL-CN-001 Cl2 Neutralization room 1 400 50 No GL-CN-002 Cl2 dosing room 1 400 50 No GL-CN-003/4 Cl2 storage room 2 400 50 No TW-CN-001 TW pumping station 1 400 50 No




4.4. Raw water intake and screening

(Refer to doc n°: VPK001 DTE IN CW DWG 008 5) (See page 11 & 12: Raw water intake hydraulic profile) Manual raw water 0,050m gross screening The Raw Water from canal gravidity inlet to WTP. The first treatment consists to a gross screening that allows to separates contents greater than 50mm from water This is a mechanical separation that requires manual operating and maintenance works. The removal of retained wastes and maintenance of sieve is the role of the WTP operations. The 0,050m gross screen is located in the canal intake chamber outside of the WTP site perimeter (closed to the canal). It is equipped with a manual penstock DN800. WTP operations are responsible of the opening/closing and maintenance of this valve. Automatic 0,010m raw water fine screening

(Supplier: FB PROCEDES – model: 2010 VARIA) (Refer to doc n°: VPK001 VCG RW PR DWG 011 2) (See mains characteristics of equipments pages 20 to 25 of this document) (Local cabinet MCC1) After the 0,050m gross screening, raw water goes through a second fine screen that allows to separate contents greater than 0.01m from water. This is an automatic and mechanical separation. Waste discharges are collected in a dedicated skip and the removal of retained wastes and maintenance of sieve are under the surveying of the WTP operations. The 0,010m automatic fine screen is located in the Raw Water Pumping Building. It is a full autonomous package which is equipped with its own electrical cabinet. Four different functioning modes are available as here under describes; Mode 1 – (local cabinet switch position on “DIST” - PLC monitoring) Remote start of the automatic screening controlled by clock time and by the upstream/downstream grid water level differential measure given by one (1) Ultrasonic instrument (ref: RW-LT-001). (Supplier: E&H model: PROSONIC S FMU90 + FDU91) Mode 2 - (local cabinet switch position on “LOCAL”) Screening cycles monitored by internal clock timer in the supplier electrical cabinet. Mode 3 - (local cabinet switch position on “MANU”) Screening using the Up and down buttons located on screen side panel. Mode 4 - (local cabinet switch position on “0”) Automatic screening not working in manual as well as in automatic




4.5. Raw water tank

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RW PR DWG 011 2) (Local cabinet MCC1) Screened raw water is gravidity routed to a 285m3 tank volume at constant level of water in production cause it is supplying from canal which is normally providing much more than 2000m3/h. RWT is equipped with:

o 1 RW-LSL-001 and 1 RW-LSH-001 (supplier: BAMO) o 1 RW-LT-002 analogical level (Supplier: E&H model: PROSONIC S FMU90 + FDU91)

4.6. Raw water pumping station

(Supplier : Peme Gourdin – type: PVMF 100-270/2) (See characteristics of equipments pages 20 to 26 of this document) (Local cabinet MCC1) One (1) air extraction fan (RW-CN-001) + air filtration (RW-YS-001) are installed Three (3) pumps vertical columns type are installed in the RWT Pumps are functioning in automatic including permutation of pumps. 1 or 2 in duty – 1 waiting Three different functioning modes are available as here under describes; Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of the pumping is authorized by raw water level thresholds on Ultrasonic analogical signal (RW-LT-002) and enslaved by: RW-LSL-001 and/or CP-LSH-001 and/or TW-LSH-001 stop pump Mode 2 - (local cabinet switch position on “MANU”) Manual start/stop from local cabinet of the pumping is enslaved by the switch level position RW-LSL-001 (RW-LSH-001 providing signalisation to SCADA) Mode 3 - (local cabinet switch position on “O”) Pumping not working in manual as well as in automatic Raw water level in tank slightly varies because it is linked to the canal which is normally providing much more than 2000m3/h. Strong water level variation into RW tank must attract the operations survey and requires a quick intervention from them thus this means:

o Problem occurs on fine automatic screen and screen grid water passing through is reduced o Problem occurs on gross primary screen and screen grid water passing through is reduced o Penstock valves upstream screenings are closed o Canal water delivery problem – Water production is stopped!




4.7. Raw water pumps discharge isolation valves

Two (2) of the installed pumps (RW-PC001/2) discharge piping are equipped with each own manual isolation valve (RW-VM-003/4) ND400. RW-PC-003 discharge piping is equipped with 2 automatic valves (not cabled) that can be manually open/close. (RW-VA-005/6) ND400. RW-VA-006 is installed and waiting for the future WTP phase-2 extension. The inlet WTP flow rate of raw water is adjusted to 997m3/h +/- 1m3/h for each RW pump in duty and manually adjustable by (RW-VM-003/04) and (RW-VA-005). Except for operation or maintenance reasons (RW-VM-003); (RW-VM-004) and (RW-VA-005) are always kept open to allow the good routing of water to the inlet plant according with the automatic start/stop of the 3 installed pumps monitored by the SCADA. Further on the common piping discharge are installed the (RW-VM-010) and (RW-VV-001). This is an automatic air degassing device which is also kept open. Outside the RW building and still on the piping discharge routing, in a dedicated valve chamber, is installed the (CB-VA-103) (not cabled). This valve is equipped with its steering wheel and must be as well kept open. It has been designed for the isolation of the circuit in case of dismantling of the installed electromagnetic flow meter (CB-FIT-101) DN600. A manual valve (CB-VM-103) is designed for the draining of the circuit and must be kept closed. The inlet WTP flow rate of raw water is adjusted to 997m3/h +/- 1m3/h for each RW pump in duty and manually adjustable by (RW-VM-003/004/005).

4.8. Raw water electromagnetic flow meter

(Supplier: E&H – model PROMAG 10W8H) (Local cabinet MCC2) (See characteristics of instruments pages 20 to 26 of this document) The inlet raw water nominal flow rate is designed for 1994m3/h with 2 pumps in duty and with 2 coagulation lines in production. The (CB-FIT-101) is surveying the flow in continue and delivers 2 electric signals to the SCADA:

o Raw water continuous flow rate in m3/h o Electrics impulse for each counted 1m3 for the inlet volume totalizing

4.9. Supernatant electromagnetic flow meter

(Supplier: E&H – model PROMAG 10L2H) (Local cabinet MCC2) (See characteristics of instruments pages 20 to 26 of this document) The inlet supernatant nominal flow rate is designed for 100m3/h with 1 pump in duty and with 1 or 2 coagulation lines in production. The (CB-FIT-100) is surveying the flow in continue and delivers 2 electric signals to the SCADA:

o Supernatant continuous flow rate in m3/h o Electrics impulse for each counted 1m3 for the inlet volume totalizing




4.10. Distribution chamber

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE ST PR DWG 001 3) (Local cabinet MCC2) No name is given to this tank on PID, it is located before the 2 coagulation tanks and it is designed to receive the raw water pumps discharge and the supernatant blending. It allows the distribution of water to 1 or 2 lines of treatment. Two (2) manual penstocks are installed and allow the isolation of 1 or 2 lines.

o CB-GA&VB-101 and CB-GA&VB-301. (Supplier: FORNES) It is the responsibility of the operations to open/close these valves according with the WTP management directives. These valves are always kept open in normal operation. At this step RW analysis are performed on line and in continues by installed instruments;

o CB-AIT-100 as pH analyser (E&H _ model Liquisys M CPM253 + Orbisint CPS11D) o CB-AIT-101 as turbidity analyser (E&H _ model Liquisys M CUM253 + Turbimax-W CUS31)

Instruments are delivering water analysis outcomes to the SCADA.

4.11. Coagulation – Flocculation - Clarification

(See characteristics of tanks and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE ST PR DWG 001 3) (Local cabinet MCC2) Coagulation – Flocculation – Clarification Treatment phase comprising two (2) lines that can works together or separately. Each line of production comprising:

o 1 coagulation tank so a total of 2 coagulation tanks o 1 flocculation tank so a total of 2 flocculation tanks o 2 lamellar clarifiers so a total of 4 lamellar clarifiers

Raw water enters WTP always gravidity follows the same way:

o A – Distribution chamber Where RW + Supernatant are blended Contact time 1.60mn at 2000m3/h Elevation speed 98.0m/h

pH analyser assembling Turbidity analyser assembling 1 Main pipe with floor mounting 1 Main pipe with floor mounting 2 Transmitter 2 Transmitter 3 weather protection cover 3 weather protection cover 4 transverse pipe with fasteners 4 cross clamp assembling 5 Hook and loop cable ties 5 transverse pipe 6 chain A CYA112 assembling with immersion pipe 7 Flexdip assembly




o B – Coagulation tanks : CB-GA-100 line 1 & CB-GA-300 line 2 Where Aluminium is injected Contact time 1.66mn at 2000m3/h Elevation speed 95.0m/h

Coagulation tanks are equipped with: - 2 mixers CB-AA-100 & CB-AA-300

Rotation speed 51rpm (Supplier: MERSEN model AV/LC 1500/1.5/51/88.9)

o C – Flocculation tanks Where Polymer + lime (if necessary) are injected and pH analysed Contact time 22.0mn at 2000m3/h Elevation speed 14.8m/h Flocculation tanks are equipped with: - 2 mixers CC-AA-100 & CC-AA-300

Rotation speed 12rpm (Supplier: MERSEN model AV/LC 3800/1.1/10/168.3)

- 2 pH analyser CC-AIT-100 & CC-AIT-300 (Supplier: E&H _ model Liquisys M CPM253 + Orbisint CPS11D)

o D – Lamellar clarifiers

Where separation of sludge from water and water clarification are performed

Four (4) clarifiers are designed for a flow rate of 2000m3/h with the followings hydraulic Characteristics of each clarifier: Operating conditions 24h/day Contact time 33.7mn at 2000m3/h Raw water flow rate 500m3/h Settling surface 64m² Effective settling surface 255.6m² Apparent Hazen speed 7.8m/h True Hazen speed 0.41m/h Lamellar surface 3984m² Lamellar plate number 2846 (Supplier: Finaxo type: wavy plate for lamellar clarifier)




Water collector 5 Water collector ND 250 Sludge collector number 6 Sludge collector ND 150mm Sludge extraction electric valve 6 (Supplier: AKO innovations –model MO-07 310 HN) Sludge extraction valve Pinch valves (Supplier: AKO innovations -model V/VF) Water High 4.50m

Sludge extraction cycle is automatic with temporized and regularly intervals. Time OFF and time ON are operation adjustable according with the lab water trials tests outcomes and according with the RW turbidity

o Turbidity ratio adjustable by selection of the turbidity referential o Time OFF extraction cycles is adjustable in minutes (range: 60mn) o Time ON extraction cycles is adjustable in seconds (range: 3600s)

4.11.1. Compressed air service

(See characteristics of Air service and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE FI PR DWG 010 3) (Supplier: AIRWCO – model Creyssensac Duplex BH 11500A and DW7 (Local cabinet MCC2) Compressed air is used as energy to close/open the pneumatic sludge extraction valves. Air compressed working pressure is set at 4.0 bar - 6 bar. Automatic start/stop according with set low and high pressures Automatic water drain capacitive valve Compressed air discharge temp max 50°C Refrigeration air dyer Compressed air production is a full autonomous package It is electrically supplied from MCC2 by switched ON a dedicated breaker Refrigeration air dryer is a full autonomous package It is electrically supplied from MCC2 by switched ON a dedicated breaker Compressed air discharge circuit pressure is surveyed by HF-PT-001;

o HF-PSL-002 service air low pressure o HF-PSH-002 service air high pressure o HF-IC-001 compressor fault

Pressure information’s are monitored by the SCADA as alarms

Alarm on service air requires an immediate intervention from operations! In order to avoid that all clarifiers + settling tanks sludge extraction valves opening simultaneously. Flow rate and volume of extracted sludge shall exceed the capacity of WTP recycling sludge so sludge will over flows from pipe routing circuit and spill out on the plant…




4.12. Filtration unit

(See characteristics of filters and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE FI PR DWG 002 3) (Local cabinet MCC2) Filtration is designed;

o To the elimination of the flocks escaped from the sedimentation / clarification stage, o To produce filtered water with the required turbidity of drinking water

After 24h filtration time, filter will clog. Filters are washed when the differential pressure between clarified water inlet and filtered water outlet reached 0.25bar. The filters are successively automatically washed. Characteristics of each filter: Number of installed filter 8 Number of nozzles per filter 2 382 Sand medium mass 90T Sand medium volume 53m3

Sand medium height 1.25m Sand medium nominal effective size 0.97mm Gravel height 0.1m Sand height 1.15m Surface of filtration 45.8m² Average water height on filter medium 1m Filtration speed 5.1m/h Maximum speed when 1 filter’s washing 5.9m/h Theoretical time for 1 filter clogs 24h up to 48h

4.12.1. Filter flow regulation

CONSTANT FILTER FLOW BY CLOGGING COMPENSATION The water level in the filter is constant or varies little; The constant filter flow rate, regardless of the grading of filter clogging, is ensured by a floating regulator placed at the exit of each of them, which acts as level regulator, with a preliminary equal distribution. This regulator creates an auxiliary loss of load, important when the filter is clean, and which vanishes when the filter is completely clogged, the regulator compensates the clogging of the filtering bed. REGULATING BY SIPHON (Supplier: PROMECA) The concentric siphon and its partialization box compound allow realizing the level regulation of which the partialization box is the water detection and water level regulator. SIPHON It consists of two concentric tubes, the flow taking place from the inner tube to the outer tube. If we introduces air in the siphon upper part, this air is driven by the water in the downstream tube where the density of the air-water mixture is lowered, thus reducing the vacuum to the siphon neck.




Without air of partialization, the vacuum at the siphon neck is equal to the pressure drop of the downstream arm, to the drop of water height "H" between the water surface of the filter and the water surface in the downstream basin restitution. With partialization by air, that vacuum is reduced to the height "h 1" equal to the product of "H" multiply by the density of the water - air blending. The difference H - h 1 = h 2 represents the pressure drop creates by supplied air. If h1 represents the pressure drop of clean filter due to the passage of flow to be filtered through the filter bed, the floor and the filtered water drainage pipe up to the neck of the siphon; h 2 represents the Clogging available height up of the filter bed. So just to introduce when filter is clean, a sufficient amount of air to create a pressure drop h 2 and , as and when the filter bed will become clogged , it is sufficient to reduce the airflow up to cancel up to increase h1 up to H. PARTIALIZATION BOX (Supplier: PROMECA) It (B) allows introducing air at the neck of siphon for the flow rate regulation it is schematic represented by a check valve (C) suspended to a spring (D) that is clipped to point (F). At constant flow, (F) is fixed. The filter clogs gradually; its flow decreases, which results to decreasing the density of the water - air blending, thus the vacuum hl at neck and in the partialization box. Opened section and hence the air flow rate are reduced under the action of the spring; the density of the water-air blending is increased, determining a height h1 greater than that which existed before clogging ; so the amount of air introduced into the siphon decreases. When the filter is completely clogged, air do not still penetrates: the filter delivers under maximum geometric fall H.

If you do not wash at this point, its flow rate will begin to decline. The partialization box thus allows automatic compensation of clogging. It also regulates the filter flow rate to filter total flow; indeed, it is sufficient that the rating point F is connected at flotation of the floater in the box. An increase of the flow corresponds to an elevation of the point F and to the reduction of the amount of air that goes to the siphon. The pressure drop h 2 decreases, resulting in increasing flow discharged through the siphon.




VACUOMETER INDICATES THE PRESSURE DROP (supplier: AIRINDEX model: VG14CR) If we place a vacuum gauge to the neck of the siphon we are measuring the vacuum hl representing the pressure drop through the filter and its piping. STARTING THE SIPHON To prevent filter at the starting that the flow rate suddenly increases until the water level in the partialization box reaches its normal level, it is sufficient to provide a gradual shift of point F or an auxiliary air inlet going vanishing.

4.12.2. Filtration valves manifold description

FILTER 1 – PROCESS CONTROL VALVES

Automatic description qty ND kW V Hz VSD CE-VA-104 Clarified water inlet 1 _ 0.5 400 50 No CE-VA-100 Filtered water outlet 1 250 400 50 No CE-VA-101 Backwash water inlet 1 400 400 50 No CE-VA-103 Scour air inlet 1 200 400 50 No CE-VA-102 Scour air vent 1 40 400 50 No Manual CE-VM-102 Siphon chamber drain 1 50 CE-VM-103 PB air inlet floating valve 1 50 CE-VM-104 PB water inlet 1 40 CE-VM-105 PB drain 1 20 CE-VM-106 Siphon neck air inlet isolation 1 50 CE-VM-107 Filter drain 1 150




4.12.3. Filter washing cycles

Washing filter sequences general information’s

o Step 1: Air backwash o Step 2: Air and water backwash o Step 3: Water backwash o Step 4: Progressive reestablishment of filtration water

Filters are washing using filtered water from WTP

Filters in washing demand are classified in the order of clogging

Filters are washing one by one successively

The filtration unit is designed to maintain nominal flow with seven (7) filters on duty when one filter

washing.

All other facilities are in production in AUTO mode.

Washing filter sequences description When clogged a filter is registered by the SCADA that will select it for automatic washing demand, and according to the waiting list order the following steps invariably take place:

o Hydraulic isolation of filter from production Conditions: CE-VA-100 and CE-VA-104 close

o Hydraulic configuration for air washing (step 1) Conditions: CE-VA-103 opened

o Automatic start of 1 air blower Conditions: CE-VA-103 opened

o Hydraulic conditions for air washing + BCKW low flow (step 2) Conditions: CE-VA-101 opened

o Automatic start of 1 BCKW pump Conditions: CE-VA-101 opened

o Stopping air blower (end of step 2) Progress: simultaneously closing CE-VA-103 and opening CE-VA-102

o Automatic start of the second BCKW pump (step 3) Conditions: CE-VA-102 ; CE-VA-103 closes and CE-VA-101 open

o Reestablishment of filter in production (end of step 3) Process acting simultaneously: - stopping the 2 BCKW pumps - closing CE-VA-101

o Progressive filter production (step 4) Conditions: - CE-VA-100 and CE-VA-104 open - Reestablishment of the production level water in partialization box

At the end of all the backwash sequences the filter is clean and level of water above the sand medium progressively return to its level of production, monitored by the floater in partialization box that should be open in order to let air get into the siphon that allows the water level regulation.




Table of backwash sequences water flow rates, durations and volumes

FILTER BACWASH SEQUENCES COMMISSIONING ADJUSTMENTS

STEP 1 – AIR BACKWASH Air duration (adjustable range 0 to 6) 6 mn Air flow rate 2 500 m3/h Air velocity 54.5 m/h Air volume 250 m3 STEP 2 – AIR + WATER LOW FLOW Duration (adjustable range 0 to 6) 6 mn Air flow rate 2 500 m3/h Water flow rate 366 m3/h Water velocity 8 m/h Water volume 37 m3 STEP 3 – WATER BACKWASH Duration (adjustable range 0 to 12) 8 to 12 mn Water flow rate 916 m3/h Water velocity 20 m/h Water volume 183 m3 STEP 4 – PROGRESSIVE REESTABISHMENT OF FILTRATION WATER Duration (adjustable range 0 to 6) 6 mn

FILTER BACKWASH WASTE WATER VOLUME

Maximum produced backwash waste water 220 m3

Table of the filter valves positions in production and in backwash O = open; C = close Sequence CE-VA

100 CE-VA

101 CE-VA

102 CE-VA

103 CE-VA

104 CE-VM

102 CE-VM

103 CE-VM

104 CE-VM

105 CE-VM

106 CE-VM

107

Air backwash C C C O C C O O C O C

Air + water bckw C O C O C C O O C O C

Water bckw C O C C C C O O C O C

production O C C C O C O O C O C

Table of the filter air blowers and pumps positions in production and in backwash R = run; S = stop Sequence Air blower 1 Air blower 2 BKW pump 1 BKW pump 2

Air backwash R S S S

Air + water bckw R S R S

Water backwash S S R R

production S S S S




4.12.4. Filtered water tank

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Local cabinet MCC2) Filtered water is directed first to a 400m3 tank from where water escape by spilling out of a concrete weir that maintain it at constant full level of water during production. It is a designed reserve of service water for the multiples uses and commodities on the plant as well as the needs of water for the miscellaneous maintenance works and chemical solutions to be prepare before the restarting of the production etc. Groups of pumps connected to the filtered tank:

o 3x 458m/h backwash water pumps o 2 x 36m3/h service water pumps o 2 x 6m3/h motive water pumps

4.12.5. Backwash Air blower

(See characteristics of installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Supplier: Ingersoll Rand air solutions HIBON model SF3.26 PC) (Local cabinet MCC2) 2 x 2500m3/h backwash air are used for the filters backwashing 1 on duty 1 on spare Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of the air blower cycles authorized by the reporting of the good position of switches limits valves positions (Supplier: SOCLA)

o Mode 2 - (local cabinet switch position on “MANU”) Manual start/stop of the air blower authorized by the reporting of the good position of switches limits valves positions

o Mode 3 - (local cabinet switch position on “O”) Air blower not working in manual as well as in automatic




4.12.6. Backwash water pumps

(See characteristics of installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Supplier: KSB - model: ETANORM RG 200-250) (Local cabinet MCC2) 3 x 458m3/h backwash water pumps are used for the filters backwashing 1 and 2 on duty 1 on spare Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of the pumping is authorized by the Filtered water level delivered by one (1) Ultrasonic instruments (HO-LT-001) (Supplier: E&H model: PROSONIC S FMU90 + FDU91) and enslaved by the FWT floating switches level position (HO-LSL / LSH-001) (Supplier: BAMO) Also by the reporting of the good position of switches limits valves positions (Supplier: SOCLA)

o Mode 2 - (local cabinet switch position on “MANU”) Manual start/stop from local cabinet of the pumping controlled and enslaved by the installed switches level position (HO-LSL / LSH-001) Also by the reporting of the good position of switches limits valves positions (Supplier: SOCLA)

o Mode 3 - (local cabinet switch position on “O”) Pumping not working in manual as well as in automatic

4.12.7. Backwash water flow meter

(See characteristics of installed instruments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Supplier: E&H model: PROMAG 10W4H) (Local cabinet MCC2) Backwash water maximum flow rate is designed for 996m3/h with 2 pumps in duty. The (HO-FIT-001) is surveying the flow in continue and delivers 2 electric signals to the SCADA:

o Backwash water continuous flow rate in m3/h o Electrics impulse of each counted 1m3 for the volume totalizing

4.12.8. Service water pumps

(See characteristics of installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Supplier: KSB - model: ETN 065-050-200-GGXA) (Local cabinet MCC2) 2 x 36m3/h service water pumps are designed to supply the filtered water distribution network. Service water is used for:

o The aluminium sulphate tanks 1&2 water filling o The lime of milk tanks 1&2 water filling o The neutralization tank water filling o The service water distribution network on the plant o The service water distribution to administrative building




Three different functioning modes are available as here under describes 1 on duty 1 on spare

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) PLC remote starting of pumping is enslaved by the FWT floating switches level position (HO-LSL / LSH-001) (Supplier: BAMO) The Filtered water level is reading by one (1) Ultrasonic instrument (HO-LT-001) (Supplier: E&H model: PROSONIC S FMU90 + FDU91) Automatic stop of the pumping TO BE DEFINED DURING COMMISSIONING A service water discharge high pressure signal is given by HD-PSH-003 and temporized and stops the pumping after few minutes

o Mode 2 - (local cabinet switch position on “MANU”)

Manual start/stop from local cabinet of the pumping controlled and enslaved by the installed switches level position (HO-LSL-001 / LSH-001)


4.12.9. Motive water pumps

(See characteristics of installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Supplier: KSB - model: MOVITEC V F006/12) (Local cabinet MCC2) The 2 x 6.35m3/h is designed for the water chlorine disinfection/regulation single use. This pumping workshop is critical for the good functioning of entire chlorination dosing and regulation system… so it requires a strong watchfulness from operations. Working pressure is controlled by HO-VD-001 – 0 to 6barg (supplier: Working flow rate is reading by HO-FI-002 – 0 to 6000L/H (supplier: BAMO model: Rotametre) Motive water discharge flow is authorized by HO-EV-001 (supplier: ASCO - model: 2/2 238) Three different functioning modes are available as here under describes 1 on duty 1 on spare

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of pumping is authorized by the Filtered water level delivered by one (1) Ultrasonic instruments (HO-LT-001) (Supplier: E&H model: PROSONIC S FMU90 + FDU91) and enslaved by the FWT floating switches level position (HO-LSL-001 / LSH-001) (Supplier: BAMO) Also depending on the electric valve (HO-EV-001) is open first by SCADA

o Mode 2 - (local cabinet switch position on “MANU”) Manual start/stop from local cabinet of the pumping controlled and enslaved the installed switches level position (HO-LSL / LSH-001)





4.13. Disinfection water tank

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Local cabinet MCC2) Water spilling out from FWT directly enters into the disinfection tank where is injected the concentrated water of chlorine use for the disinfection of the filtered water. 1000m3 DWT volume is designed to provide chlorine in water sufficient contact time for the organic compounds to be oxidized corresponding to the chlorine break point acting. DWT working volume is constant at full level and water flow outlet from tank by spilling out a dedicated overflow. DWT is equipped with:

o Internal compartmentalization that allow better dispatching of chlorine in water o SS overflow ND 600mm at level 182.89m o HO-LSL-002 for the protection of service water booster pumping lake of water (supplier: BAMO)

4.13.1. Service water booster pumps

(See characteristics of installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Supplier: KSB - model: SUPRESS ECO SE.2B H 4 2 6 C) (Local cabinet MCC2) Service water booster pumps skid is a full autonomous package It is electrically supplied from MCC2 by switched ON a dedicated breaker It’s an automatic start/stop functioning controlled by enclosed low and high pressure analogical transmitter and enslaved by the HO-LSL-002 low water level is not reached. 2 x 3.90m3/h service water booster pumps are designed to supply the disinfected water distribution network. Service water booster is used for:

o Safety showers dispatched in Reagent and chlorine building (supplier: Orchidis) o The Polymer POLYDOS 412 ECO water filling (supplier: Grundfos) o The polymer injection flocculation water dilution and polymer injection sludge water dilution o The GL-II-002 free chlorine in water analyser housing module

This pumping workshop is critical for the good functioning of entire chlorination dosing and regulation system… so it requires a strong watchfulness from operations. Working water discharge pressure can be adjusted at 4 to5 barg




4.14. Treated water

(Refer to doc n°: VPK001 DTE WT PR DWG 003 8)

Disinfected water from DWT is directly routed to the treated water tank that is designed to provide a 5000m3 duty storage volume. The water production flow rate and water discharging flow rate can be slightly different. The treated water tank can therefore be emptied or filled gradually. It is the prerogative of the operations of monitoring and adjusting the flow rates of production and distribution. The TWT volume capacity offer 2h: 30m maximum time of water distribution at nominal 1900m3/h flow rate after stopping the water production. Treated drinking water quality must meet the standards of the Code of Health (WHO) before to be discharged into the city network and it is the duty of the on site laboratory to perform the water analysis and to provide the water analysis outcomes at any time. These treated water analyses can be regularly performed and certified by an external and official laboratory

4.14.1. Treated water tank

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 003 8) (Local cabinet MSB) TWT characteristics and equipments 1 tank of 5 665m3 total volume 1 Stainless steel overflows ND 900mm 1 Stainless steel common suction pipe with strainer ND 900 1 AC-LSL-001 and 1 AC-LSH-001 (supplier: BAMO) 1 AC-LT-001 analogical level (Supplier: E&H model: PROSONIC S FMU90 + FDU91)

4.14.2. Treated water pumping

(See characteristics of equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 012 2) (Supplier: Peme Gourdin – model: KL 250-400) (Local cabinet MSB) Treated water is pumped from the bottom of TWT via a water suction and discharge piping manifold comprising:

o 3 ND500 butterfly manual valves at the suction of pumps (supplier: SOCLA) o 3 ND400 flange adaptations (supplier: o 3 ND400 single swing check valves at the discharge of pumps (supplier: APEF – model AX) o 3 ND400butterfly manual valves at the discharge of pumps (supplier: SOCLA) o 1 ND600 TW-PT-001 discharge working pressure transmitter (supplier: E&H model o 1 TW-FIT-001 (supplier: E&H model: PROMAG 10W6H) o 1 ND600 TW-VC-001 (supplier: CLA-VAL France) o 1 ND600 TW-VM-007 (supplier: SOCLA)




3 x 947m3/h treated water pumps are designed to supply the city water distribution network. Three different functioning modes are available as here under describes In manual as well as in automatic modes two (2) pumps cannot be started at the same time for reasons of possible mechanical stress and water flow and pressure regulation stabilisation time. VINCI commissioning recommends giving five (5) minutes gap time between two (2) starting of pump. 1 or 2 on duty 1 on spare

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of pumping is authorized by the treated water level thresholds on Ultrasonic analogical signal AC-LT-001 and enslaved by: AC-LSL-001 stop pump AC-PIT-001 stop pump


Manual start/stop from local cabinet of the pumping controlled and enslaved by: AC-LSL-001 stop pump & AC-PIT-001 stop pump

o Mode 3 - (local cabinet switch position on “O”)

Pumping not working in manual as well as in automatic

4.14.3. Treated water pumps discharge relief-pressure sustaining valve

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 012 2) (Supplier: CLA-VAL France - model: G1E 50-701 / KCOSX ND600 NP10) The 1900m3/h filling flow rate of drinking water cannot allow maintaining a required a regular positive pressure into the Faisalabad city water network that can induces morbid and damaging results for the pumping station. No positive counter pressure at the discharge of pumps induce the pumps rotation speed increase up to its hydraulic curve designed functioning point and shall enter into over speed that will result the pumps cavitations phenomena then the mechanical and irreversible damages on the pump centrifuge wheel. Further more during over speed rotation of pumps, thermodynamic energy is transferred to the water molecular quantum structural equilibrium that will demand to be dissipated otherwise in case of instantaneous pumps stopping without the integrated motor rotation speed ramp down driving (I.e. when electrical supply power trips…) this energy will be transferred into mechanical energy resulting to the possible destruction of some mechanical weak structural enclosed element of the pipe circuit… it’s the “HYDRAULIC RAM STROKE”! So that is demonstrates that treated water pump discharge pressure and flow regulation is a critical parameter that requires the attentive watchfulness of operations. According with here above described risks, it has been designed to insert a hydraulic system that allows sustaining a dynamic positive pumps discharge pressure regulation by the TW-VC-001 control of the downstream pressure in the city network. With the Respective losses of load for the following flows:

947 m3/h 0.3mWC

1894 m3/h 1.0mWC

2841 m3/h 2.4mWC




4.14.4. Treated water flow meter

(See characteristics of installed instruments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE WT PR DWG 012 2) (Supplier: E&H model: PROMAG 10W6H) (Local cabinet MSB) Treated water maximum flow rate is designed for 1900m3/h with 2 pumps in duty. The (AC-FIT-001) is surveying the flow in continue and delivers 2 electric signals to the SCADA:

o treated water continuous flow rate in m3/h o Electrics impulse of each counted 1m3 for the volume totalizing

4.15. Sludge extraction

Production of drinking water induces production of sludge due to the separation of mineral and organics TSS from water… Volume of sludge has been evaluates to about 23,000kg/d representing 3,200m3/d. This calculation is based on a RW turbidity of 230 NTU It has been also estimates that turbidity could increase up to about 700NTU due to the climate variable conditions met along one year in Faisalabad; Volume of sludge based on a turbidity of 700 NTU is 67,000kg/d representing 7,800m3/d. Table of daily sampled RW analysis outcomes and correlated curves of Turbidity / Temp / Average NTU during the year 2012 in Faisalabad

0

5

10

15

20

25

30

35

40

0

100

200

300

400

500

600

700

800

Turbidity (NTU)

Température

11 Moy. mobile sur pér. (Turbidity (NTU))




Rakh branch canal water near Jhal Khanuana – 9 months of water analysis outcomes synthesis

Outcomes analysis Turbidity NTU

Temperature °C

Conductivity µS/cm

pH TH mg/l

HCO3

mg/l AVERAGE 228 28 219 8 132 119

MAXIMUM 686 36.2 372 8.2 164 192

MINIMUM 7.07 15.3 148 6.51 88 80

Origins and volumes of sludge to be treated are from different water treatment workshops of WTP as described in followings 4.15.1 and 4.15.2

4.15.1. Sludge extraction from clarifiers

(Refer to doc n°: VPK001 DTE ST PR DWG 001 3 + VPK001 DTE FI PR DWG 010 3) (See characteristics of equipments pages 20 to 26 of this document) (Local cabinet MCC2) Sludge is extracted from clarifiers by an internal pipe network that suctions sludge from the bottom and on all the surface of clarifiers then gravidity and periodically several times per hour, the sludge is extracted to outside of clarifiers then routed to the recovery tanks. Each clarifier is equipped with its own and independent extraction system comprising:

o 6 stainless steel (SS) ND150 extraction pipe sludge collectors o 6 pneumatic valves for extraction (Supplier: AKO innovations – model VF150.3X) o 6 3/2 ways solenoid valves (Supplier: AKO innovations – model Airtec BM01) o 5.0 barg compressed air supply

Volume of sludge to extract is variable according with the clarified water turbidity and linked with the efficiency of the flocculation (chap 3.3). RW Turbidity indicates us the quantity of sludge that canal water is carrying into WTP and thus the clarified water turbidity indicates us the settled quantity of sludge to be extracted per hour. According to RW turbidly the Sludge extraction is monitored from the PLC as follow:

o Set the RW NTU referential value = 250 (adjustable by operator) o Divided by CB-AIT-101 RW NTU = 250 (analyzer reading) o give a NTU ratio = 1

For each clarifier

o 1 time OFF (adjustable time range 0-60mn) o 1 time ON (adjustable time range 0-1999s)

Automatic sludge extraction is calculated as follow:

o Set Time OFF (time range 0-60mn) = 15.0 T.OFF corrected x NTU ratio = cycle of extraction/hr = every 15x1 = 15mn Calculated cycles per hour = 4 cycles /hr

o Set Time ON (time range 0-1999sec) = 15.0 Each of the 6 valves shall be successively 15.0s opened during 1 cycle T.ON x cycles/hr = 60sec open time / hr

Sludge extraction calculated flow rate per ND150 valve 93L/s ND150 pneumatic valve Opening/Closing time at 2.5barg 7s / 4s Compressed air HF-PSL-002 must be ok




Estimation of the 4 clarifiers sludge production according with RW turbidity

Raw water turbidity

Clarified water turbidity

RW m3/h

Sludge m3/h

Sludge KG/h

Sludge KG/d

RW % vol

Sludge Kg/m3

Sludge m3/d

200 10 1994 110 823 19 755 5.5 7.48 250 10 1994 140 1 023 24 555 7.0 7.31 300 10 1994 170 1 223 29 355 8.5 7.20 350 10 1994 200 1 423 34 155 10.0 7.12 400 10 1994 230 1 623 38 995 11.5 7.05 450 10 1994 255 1 823 43 753 12.8 7.15 500 10 1994 280 2 023 48 550 14.0 7.25 550 10 1994 310 2 223 53 350 15.5 7.17 600 10 1994 340 2 423 58 150 17.1 7.12 650 10 1994 370 2 623 62 950 18.6 7.09 700 10 1994 400 2 823 67 750 20.1 7.06

4.15.2. Sludge production from filters backwashes

(See characteristics of filters and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE FI PR DWG 002 3) (Local cabinet MCC2) From the filtration unit, sludge volume production per day is corresponding with number of filters

backwashing per day. It is mainly linked to the water clarification efficiency, clarified water flow rate,

filtration backwashing efficiency, filtration speed, filter loss of load, etc...

At nominal conditions, (RW = 1994m3/h – 230NTU – ph 6.5 to 8.5 – temp not mentioned) It is estimates four (4) filters backwashing per day.

Estimation of the sludge production by filtration unit according with filter backwashing number

Backwashing filters per day

Filtered water turbidity

CW m3/h

Sludge m3/d

Sludge Hr/d

Sludge KG/d

RW % vol

Sludge Kg/m3

4 1 1 827 894 1.95 807 1.9 0.91 5 1 1 827 1 145 2.50 808 2.4 0.71 6 1 1 827 1 374 3.00 808 2.9 0.58 7 1 1 827 1 603 3.50 808 3.3 0.50 8 1 1 827 1 832 4.00 808 3.8 0.44

Over 5 filters washing demands per day indicates that the filtration unit functioning exceeds normal efficiency and requires that the causes of this to be investigated from operations. All the raw water and water clarification’s and filtration’s parameters to be checked and confirmed!




4.15.3. Sludge recovery tanks process description

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RT PR DWG 004 3) (Local cabinet MCC4) Three (3) recovery tanks are designed to receive the regular sludge extractions from clarifiers and the peak volumes of waste water from filters backwashes that requires temporary buffer volume storage. Recovery tank is immerged mixers equipped in order to maintain sludge suspension in water at this step

of the sludge recycling.

3 x 475m3 tanks are designed for the temporary storage of wastes of the WTP and each one equipped with:

o 2 x 110m3/h immerged pumps (supplier: KSB – model: KRTF 100/250/74UG-S) o 1 x 2225m3/h immerged mixers (supplier: XYLEM – model: FLYGT SR 4650) o 3 floating level contactors (supplier: BAMO – model: NIVOSTOP SG2) o 3 lifting gibbets for mixers (supplier FLYGT – model: 320-600KG) o 1 mobile lifting gibbet + 3 lifting davits for pumps (supplier FLYGT – 320-600KG)

Three different pumping modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of pumping is authorized by the RT water level enslaved by the RT floating switches level positions. - EB-LSLL-100 / 200 / 300 pump stop / run - EB-LSL-100 / 200 / 300 mixer stop/run - EB-LSH-100 / 200 / 300 signalization level too high


Manual start/stop from local cabinet of the pumping controlled and depending on the installed switches level position EB-LSLL-100 / 200 / 300


Three different mixing modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of mixing is authorized by the RT water level enslaved by the RT floating switches level positions. - EB-LSLL-100 / 200 / 300 pump stop / run - EB-LSL-100 / 200 / 300 mixer stop/run - EB-LSH-100 / 200 / 300 signalization liquid level in tank too high


Manual start/stop from local cabinet of the pumping controlled and enslaved by the installed switches level position EB-LSL-100 / 200 / 300






Estimation of total volume of sludge collected into the recovery tanks per day RW 1 994 m3/h 47 856 m3/d RW turbidity

CW turbidity

clarifier m3/d

clarifier KG/d

4 Filters m3/d

4 Filters KG/d

RT total m3/d

RT total KG/d

RW % vol

RT kg/m3

200 10 2 650 19 755 894 808 3 544 20 571 7.4 5.80 250 10 24 555 894 808 4 250 25 358 8.9 5.96 300 10 29 355 894 808 4 955 30 145 10.4 6.08 350 10 34 155 894 808 5 661 34 932 11.8 6.17 400 10 38 995 894 808 6 131 39 718 12.8 6.47 450 10 43 753 894 808 6 837 44 505 14.3 6.51 500 10 48 550 894 808 7 543 49 292 15.8 6.53 550 10 53 350 894 808 8 013 54 079 16.7 6.75 600 10 58 150 894 808 8 954 58 866 18.7 6.57 650 10 62 950 894 808 9 424 63 653 19.7 6.75 700 10 9 236 67 750 894 808 10 130 68 440 21.2 6.76

4.15.4. Sludge settling tanks

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RT PR DWG 004 3) (Local cabinet MCC4) Tanks are designed to give time for sludge thickness. Polymer at determinate dosing rate by onsite laboratory is injected at this step of the sludge treatment in order optimising the sludge separation from water and at the step ahead optimising the sludge dehydration in drying beds. Settling time should not exceed 3hrs Under the effect of gravity a reducing volume of the sludge of 2 to 4 times is expected. So the concentration will can be increased from 7g/l minimum up to 025g/l. That means an initial volume of sludge’s divided by 62 or 3. 3 x 300m3 settling tanks (ST) are designed for the sludge thickness Each ST is equipped with its own and independent extraction system comprising:

o 7 PVC/stainless steel (SS) ND65 extraction pipe sludge collectors o 7 pneumatic valves for extraction (AKO innovations – model VF065.3X.33.3LA) o 7 3/2 ways solenoid valves (Supplier: AKO innovations – model Airtec BM01) o 5.0 barg compressed air supply

4.15.5. Sludge extraction from settling tanks process description

Sludge is extracted from ST by a pipe network that suctions sludge at the bottom and on all the surface of ST then gravidity and periodically and several times per hour is routed to the sludge pit Total volume of sludge to be extracted comprising volume of extracted sludge from clarifiers added with the filters backwash water volumes per day. Total volume is variable according with the raw water turbidity and number of filter backwashing.




According to RT pumps run/stop the Sludge extraction is monitored from the PLC as follow: Note: At contrary from the clarifiers sludge extraction… On the Settling Tanks all the 7 pneumatic valves shall open together. For each one of the 3 settling tank in association with its RT sludge extractions are controlled by:

o 1 Time STstart (Cycle extraction start adjustable time range 0-240mn) (Timer start when RT pump (EB-PC-xxx) start run = waiting time before extraction start)

o 1 Time STstop (Cycle extraction stop adjustable time range 0-240mn) (Timer start when RT pump (EB-PC-xxx) stop run = waiting time before extraction stop)

o 1 Time OFF (Sludge extraction time OFF adjustable time range 0-60mn) (Sludge extraction time OFF)

o 1 Time ON (Sludge extraction time ON adjustable time range 0-1999s) (Sludge extraction time ON)

For example; Automatic sludge extraction is calculated as follow: It is the role of the operations associated with Lab, to sample sludge from ST and to perform SVI analysis (see chapter 6 in this document). According with the SVI outcomes + ST normally working number and including the sludge pit pump flow rate, the time of cycle duration per hour, and time OFF and time ON per cycle shall be adjusted.

o Set T.STstart 100mn o Set T.STstop 100mn

o Set T.OFF 7.5mn Calculated cycles per hour 8 cycles per hour – per ST

o Set T.ON -1 ST working) 120sec -2 ST working 60sec -3 ST working 40sec

Sludge extraction flow rate theoretical per one ND65 valve 14.6 L/s ND65 pneumatic valve Opening/Closing time at 2.5barg 1s / 1s Compressed air HF-PSL-002 must be ok Estimation of total volume of sludge routed to the sludge pit per day according to sludge thickness. RW 1 994 m3/h 47 856 m3/d RW NTU

CW NTU

RT total KG/d

RT total m3/d

Sludge kg/m3

Sludge m3/d

Pump hr/d

Sludge kg/m3

Sludge m3/d

Pump hr/d

Supernatant m3/d

200 10 20 571 3 544 15 1 371 13.8 20 1 028 10.3 2 173 2 516 250 10 25 358 4 250 15 1 691 16.9 20 1 267 12.7 2 559 2 983 300 10 30 145 4 955 15 2 009 20.1 20 1 507 15.1 2 946 3 448 350 10 34 932 5 661 15 2 328 23.3 20 1 746 17.5 3 333 3 915 400 10 39 718 6 131 15 2 647 26.5 20 1 985 19.9 3 484 4 146 450 10 44 505 6 837 15 20 2 225 22.3 4 509 4 612 500 10 49 292 7 543 15 20 2 464 24.7 5 215 5 318 550 10 54 079 8 013 15 20 5 685 5 788 600 10 58 866 8 954 15 20 6 626 6729 650 10 63 653 9 424 15 20 7 096 7 199 700 10 68 440 10 130 15 20 7 802 7 905




4.15.6. Sludge pit pumps process description

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RT PR DWG 004 3) (Local cabinet MCC4) One (1) sludge pit is designed to receive the regular sludge extractions from sludge ST’S. Pumped sludge is discharged to the drying beds. 1 x 12m3 sludge pit is designed to pump 15 to 20g/l thickness sludge Sludge pit pump is equipped with:

o 2 x100m3/h immerged pumps (supplier: KSB – model: AMAREX ND100-220/034ULG-S) o 2 floating level switches (supplier: BAMO – model: NIVOSTOP SG2) o 1 lifting gibbets for pumps (supplier FLYGT – model: 320-600KG)

2 x 100m3/h pumps are designed to reject sludge to drying beds. 1 on duty 1 on spare Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of pumping is enslaved by the sludge pit floating switches level position ED-LSL-101 stop pump and/or CP-LSH-001 ED-LSH-101 start pump


Manual start/stop from local cabinet of the pumping controlled enslaved by the installed switches level position ED-LSL-101



4.15.7. Supernatant pit pumps process description

(See characteristics of tank and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RT PR DWG 004 3) (Local cabinet MCC4) One (1) supernatant pit pumps is designed to partially return recycled water to upstream plant. At WTP nominal flow rate and turbidity it has been designed a water loss ≤ 7%. The water recycling is dimensioned to reach this performance. 1 x 12m3 supernatant pit is equipped with:

o 2 x100m3/h immerged pumps (supplier: KSB – model: AMAREX KRTE 80-250/54UG-S) o 2 floating level switches (supplier: BAMO – model: NIVOSTOP SG2) o 1 lifting gibbets for pumps (supplier FLYGT – model: 320-600KG) o 1 stainless steel overflow ND400




2 x 100m3/h pumps are designed to return recycled water to the WTP upstream the coagulation step. 1 on duty 1 on spare Estimation of total volume of recycled supernatant per day according to recycled sludge RW 1 994 m3/h 47 856 m3/d RW NTU

CW NTU

RT total KG/d

RT total m3/d

RW % vol

Sludge m3/d

Sludge m3/d

Supernatant m3/d

Supernatant reject m3/d

Supernatant recycle % vol

200 10 20 571 3 544 7.4 1 371 1 028 2 173 2 516 0 116 4.54 5.01 250 10 25 358 4 250 8.9 1 691 1 267 2 559 2 983 159 583 5.01 5.01 300 10 30 145 4 955 10.4 2 009 1 507 2 946 3 448 546 1 048 5.01 5.01 350 10 34 932 5 661 11.8 2 328 1 746 3 333 3 915 933 1 515 5.01 5.01 400 10 39 718 6 131 12.8 2 647 1 985 3 484 4 146 1 084 1 476 5.01 5.01 450 10 44 505 6 837 14.3 2 225 4 509 4 612 2 109 2 212 5.01 5.01 500 10 49 292 7 543 15.8 2 464 5 215 5 318 2 815 2 738 5.01 5.01 550 10 54 079 8 013 16.7 5 685 5 788 3 285 3 388 5.01 5.01 600 10 58 866 8 954 18.7 6 626 6729 4 226 4 329 5.01 5.01 650 10 63 653 9 424 19.7 7 096 7 199 4 696 4 799 5.01 5.01 700 10 68 440 10 130 21.2 7 802 7 905 5 402 7 665 5.01 5.01

Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of pumping is enslaved by the supernatant pit floating switches level ED-LSL-102 stop pump and/or CP-LSH-001 ED-LSH-102 start pump


Manual start/stop from local cabinet of the pumping controlled and enslaved the installed switches level position ED-LSL-102



4.16. Sludge dehydration

(See characteristics of drying beds and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE DB PR DWG 005 3) The drying bed is applicable to sunny countries on a permeable soil. It allows to directly obtaining by simple filtration and gravidity pressure a high dryness performances according to local climate conditions. The drying bed is operated according to the following principle: the sludge is spread on the surface of the bed layers. The water from the sludge is mainly eliminated by drainage and evaporation. Figure of one drying bed in pause phase

Drought crevices




4.16.1. Sludge drying beds process description

Designed configuration is a serial of 8 rectangular beds .The bottom of beds is equipped with a PVC piping network within the gravel for drainage of water and the whole is covered by a layer of sand. Sand beds are designed to allow manual removal of dried sludge

o A river sand minimum 15cm high o A 4-8mm gravel sizing minimum 50cm high o A 15-20mm gravel sizing minimum 50cm high o A bottom draining Pipe network PVC ND200 & ND80 o A geo-textile membrane o A blinding concrete construction bottom with slope 2%

Drying beds dimensional and filling schedule management

o Length 45m o Width 15m o Depth 1.5m o Surface 675m² o Total volume 1 000m3

Sludge drying beds operating procedure described here under is based on the capacity of 1 drying bed to collect 1 day of sludge volume production at normal conditions. Drying beds management can change due to the variable quality of the sludge’s, so sludge must be regularly sampled and analyzed by lab and results recorded into a dedicated data’s logbook GLOBAL WORKING SCHEDULE OF DRYING BEDS TRAINS PERIODS TURNOVER Period A Drying beds train-A n° 1; 2; 3; 4 in duty during 40 days Drying beds train-B n° 5; 6; 7; 8 in pause during 40 days for sludge’s drying and removal Period B Drying beds train-B n° 5; 6; 7; 8 in duty during 40 days Drying beds train-A n° 1; 2; 3; 4 in pause during 40 days for sludge’s drying and removal INDIVIDUAL MONITORING OF DRYING BEDS TURNOVER 1st day - Drying bed n°1 filling and draining during 1 day

Then drying bed n°1 draining/evaporating during three days 2nd day - Drying bed n°2 filling and draining during 1 day Then drying bed n°2 draining/evaporating during three days 3rd day - Drying bed n°3 filling and draining during 1 day Then drying bed n°3 draining/evaporating during three days 4th day - Drying bed n°4 filling and draining during 1 day Then drying bed n°4 draining/evaporating during three days After 10 fillings, train-A beds is left in pause and train-B beds is filling After 10 fillings, train-B beds is left in pause and train-A beds is filling again… and so on…




Calculation of estimated sludge volumes balance

o 12hr to 18hr per day filling time of 1 drying bed m3/d x 00.0 kg/m3 o Estimated draining volume the 1st day m3 o Estimated volume remaining in bed the 1st day m3 x kg/m3 o Estimated draining volume per week m3 o Estimated draining volume per day m3/d o Estimated draining volume per m² L/d/m² o Estimated draining flow per m² (ref: 0.5 l/h/m²) L/h/m² o Estimated sludge remaining in bed the 1st week kg/m3

4.16.2. Dried sludge removal

Removal of dried sludge from beds is organized and realized under the control of WASA in charge of the

global operations and owner of the WTP.

4.17. Collection pit

(See characteristics of CP and installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE FI PR DWG 013 3) (Supplier: KSB – model: KRTK 300-400 406UG-S) (Local cabinet MSB) The WTP water wastes are routed to the collection pit equipped with 2 x 997m3/h immerged pumps. Collection pit is equipped with:

o 2 ND400 knife manual valves at the discharge of pumps (supplier: ) o 2 ND400 check ball valve (supplier: APEF) o 2 ND400 flange adaptations (supplier: o 1 CP-LT-001 US transmitter (supplier: E&H) o 2 CP-LSL-001 & CP-LSH-001 floating levels contactors (supplier: Bamo)

2 x 947m3/h pumps are designed to reject waste water to the city canal downstream RW intakes. 1 or 2 on duty 1 on spare Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of pumping is authorized by the CP water level delivered by one (1) Ultrasonic instruments (CP-LT-001) (Supplier: E&H model: PROSONIC S FMU90 + FDU91) and enslaved by the CP floating switches level position (CP-LSL-001 / LSH-001) (Supplier: BAMO)


Manual start/stop from local cabinet of the pumping controlled and enslaved by the installed switches level position (CP-LSL-001 / LSH-001)


Note to operations: The WTP production is depending on the good functioning of CP pumping




5. CHEMICAL REAGENTS PROCESS DESCRIPTION

CHEMICAL HAZARDS (see safety procedures described chap 12: WTP Maintenance instructions)

Chemical hazards handling chemical reagent presents burn and toxic hazard to the operator. ACCORDING TO THE PRESENT RISKS the port of the PPI

(Personal protective equipment) is mandatory for any operation on chemicals A chemist must determinate the chemical treatments dosing rates to ensure the quality of the treated water. Once are known the dosing rates of each reagents, water diluted solutions must be prepared in the reagent tanks following the described procedures in this document. The reagents used on the WTP are as follows: Aluminium sulphate RW coagulation Calcium hydroxide RW pH correction Polymer RW flocculation Caustic soda Cl2 gas leakage neutralization chlorine gas TW disinfection To avoid blockages in the pipes it is recommended do not exceed the following nominal concentrations: Aluminium sulphate 200 g / l Lime milk 50 g / l Polymer 3.5 g / l as stock solution

0.2 g / l as diluted solution

(See characteristics of chemical tanks and equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RE PR DWG 006 3) (Refer to doc n°: VPK001 DTE RE PR DWG 007 4) (Local cabinet MCC3)

PRINCIPLE OF PREPARATION OF THE CHEMICAL ALUMINIUM & LIME TANKS SOLUTIONS

N° Aluminium sulphate & Lime milk Actions / verifications

1

Fill the emptied tank with service water from Low level (LSL) up to high level (LSH)

o Open the tank dedicated filling water manual valve o Set the filling water flow rate at 10m3/h o Check visual level on transparent PVC pipe o Check tank mixer is started o Stop filling water o Confirm level reached on electrical front panel

2

Add the quantity of associated chemical reagent bags according with the WTP lab instructions

o This operation is manual under the control and managing of the LAB technician

3

Give time to the reagent complete dilution into solution before tank change over

o Check visual level on transparent PVC pipe o Check no water spilling out from overflow o Confirm level reached on electrical front panel o Aluminium sulphate dilution time 60mn o Lime of milk dilution time 60mn

4 Chemical reagent solution’s ready o 60 mn mixing the solution




5.1. Aluminium sulphate

(See characteristics of Aluminium workshop and equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE RE PR DWG 006 3) (Local cabinet MCC3) Determining the dosage of aluminium sulphate is the role of the site laboratory which regularly performs jar test trials as described in this document. Once is known the dosing rate we can set the appropriate adjustment of dosing pumps.

5.1.1. Aluminium sulphate dosing pumps characteristics

(Supplier: Grundfos – model: DMX 525/3 double head) (Local cabinet MCC3) Number of dosing pump 2 x (double head) Adjustable flow rate per head 0 to 525 L/h Adjustable stroke rate 0 to 100% Maximum working pressure 3.0 barg Pump VSD adjustment 50 Hz Concentration of reagent solution 200 g/l Calculation of Aluminium sulphate dosing flow rates according with dosing rates

Aluminium dosing rate

g/m3

Raw water inlet flow rate

m3/h

Injection flow rate

L/h

Injection flow rate

L/d

Aluminium weight

kg/h

Aluminium weight

kg/d

Pump stroke rate

0-100%

AL2 tank change over

days

20.0 1994 199 4 790 39.9 957.1 19% 3.01 25.0 1994 249 5 980 49.9 1 196.4 24% 2.46 30.0 1994 299 7 180 59.8 1 435.7 28% 2.05 35.0 1994 349 8 370 69.8 1 675.0 33% 1.76 40.0 1994 399 9 570 79.8 1 914.2 38% 1.54 45.0 1994 449 10 770 89.7 2 153.5 43% 1.36 50.0 1994 499 11 960 99.7 2 392.8 48% 1.23 55.0 1994 548 13 160 109.7 2 632.1 52% 1.12 60.0 1994 598 14 360 119.6 2 871.4 57% 1.03 70.0 1994 698 16 750 139.6 3 349.9 67% 0.9

5.1.2. Aluminium sulphate tanks solution preparation

Preparation of the solution is manual under the LAB control and managing Pour the chemical reagent bags contents into the tank avoiding bags or part of bags going into tank. When dissolution of chemical is complete, stops the mixing. Tank is ready to be suctioned. Commercial Aluminium sulphate tanks solution preparation calculation Number of tank 2 Concentration of solution desired expressed in Al2 (SO4)3, 18 H2O 200 g/L Surface of tank 7.02 m² Duty water High of tank 2.10 m Duty volume of tank 14 750 L Total volume of tank 18 954 L Weight of reagent required 2 950 kg Weight of one reagent packing bag 25 kg Required number of bags for the preparation 118 bags




5.1.3. Control the aluminium sulphate solution concentration

When aluminium sulphate dissolution is complete (after 1 hr mixing time) it’s necessary to control the concentration to confirm that water treatment dosing rate and injection flow rate will be according with the LAB specifications. We recommend using density meter range 1000 to 1200 For this purpose here under see the following chemical information’s:

ALUMINIUM SULPHATE - AL2(SO4)3.18H2O unit

Supplier Zibo Guangzheng Aspect White crystal Odour None Use Coagulation Bulk density 1.20 Kg/dcm3 Technical concentration 15 - 17 % Packing 25 kg Solubility in water 650 g/l Potential health effects Refer to MSDS Specific gravity 1.69

ALUMINIUM SULPHATE - AL2(SO4)3.18H2O Density Concentration at 15°C unit

1025 50 g/l 1037 75 g/l 1050 100 g/l 1075 150 g/l 1100 200 g/l 1108 218 g/l

5.1.4. Calculates the dosing pump injection flow rate

Raw water coagulation treatment dosing rate is determinates by the LAB jar testing on site. According with the dosing rate we calculate the dosing pump injection flow rate as follow:

5.1.5. AL2 mixing and dosing process control description

Each of the two installed dosing pumps is equipped with 2 dosing heads that allow running 1 pump and to inject coagulant into the 2 coagulation tanks at RW nominal flow rate. Each head flow rate can be set separately by adjusting its stroke cadence rate by rotating a cursor 0% to 100% range located in front the dosing pumps. (When pump is running only) Each pump is equipped with a Variable Speed Drive located within the MCC3 cabinet.




2 x 2x525 L/h dosing pumps are designed to inject coagulant into coagulation tanks 1 & 2 1 on duty 1 on spare Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of dosing is authorized by the AL2 tanks solution levels delivered by 3 floating switches level position (Supplier: BAMO) - GB-LSL-101 / 201 pump stop / run - GB-LSH-101 / 201 mixer stop/run - GB-LSHH-101 / 201 signalization liquid level in tank too high


Manual start/stop from local cabinet of the dosing pump controlled and enslaved by the installed switches level position GB-LSL-101 / 201

o Mode 3 - (local cabinet switch position on “O”) Dosing pump not working in manual as well as in automatic

PSV are installed at the dosing pumps discharge set at: 2.0 barg (Supplier: Grundfos – code: 96295911) CPV are installed at the local injection point set at: 0.5 barg (Supplier: Grundfos – code: ) Hydropneumatic accumulators are installed at the dosing pump discharge (Supplier: Hydracar) 1 vertical axis mixers is designed for the mixing of aluminium solution into each tank 1 on duty during preparation then stops. (Supplier: MERSEN – model: AV/LC 1000-/1.5/103/60.3) (Local cabinet MCC3) Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of mixing is authorized by the AL2 tanks solution levels delivered by 3 floating switches level position (Supplier: BAMO) - GB-LSL-101 / 201 pump stop / run - GB-LSH-101 / 201 mixer stop/run (1.2m from tank bottom) - GB-LSHH-101 / 201 signalization liquid level in tank too high


Manual start/stop from local cabinet of the mixer enslaved to GB-LSH-101 / 201

o Mode 3 - (local cabinet switch position on “O”) Mixing not working in manual as well as in automatic




5.2. Lime milk

(See characteristics of Lime workshop and equipments pages 20 to 25 of this document) (Refer to doc n°: VPK001 DTE FI PR DWG 007 3) (Local cabinet MCC3) Aluminium sulphate is an acidic pH product that can causes the water medium pH decreasing and can make the water medium chemically aggressive. The pH correction is then made by injecting lime milk that is a basic pH product and causes the pH rising; More generally, it is used as pH and/or calcium-carbonate equilibrium correction Determining the dosage of lime milk is the role of the site laboratory which regularly performs jar test trials as described in this document. Once is known the appropriate treatment dosing rate, the adjustment of injection flow rate allows obtaining the desired quantities as well as optimum treatment efficiency. On our plant 3 lime milk injection points have been selected to offer 3 different water correction demands;

o correction of water pH of coagulation-flocculation o correction of clarified water pH o correction of filtered water pH (calcium-carbonate equilibrium)

5.2.1. Lime milk pumps characteristics

(Supplier: SEEPEX _ model: BN 5-12) (Local cabinet MCC3) Properly speaking it’s not dosing pump but progressive cavity recirculation pumps. Number of dosing pump 2 Pump flow rate 3.0 m3/h Adjustable stroke rate 0 to 100% Maximum working pressure 4.0 barg Concentration of lime milk solution 30 g/l

5.2.2. Lime milk tank solution preparation

Preparation of the solution is manual under the LAB control and management. Pour the chemical reagent bags contents into the tank taking care that bags or part of bags not going into tank. After 1 hour mixing solution is complete, lime milk is ready to be used Lime milk tanks solution preparation calculation Number of tank 2 Concentration of solution expressed in Ca (OH)2 30 g/L Surface of tank 9.00 m² Duty water High of tank 2.10 m Duty volume of tank 18.9 m3 Total volume of tank 25.2 m3 Weight of reagent required 567 kg Weight of one lime packing bag 25 kg Required number of bags for the preparation 23 bags




5.2.3. Control the lime milk concentration

When lime milk solution is complete (after 1 hr mixing time) it’s necessary to control the concentration to confirm it is according with the LAB specifications. We recommend using density meter range 1000 to 1100 For this purpose here under see the following chemical information’s:

CALCIUM DI-HYDROXYDE – CA (OH)2 unit

Supplier : Daim Fertilizer & Chemicals Aspect White powder Odour None Use pH correction –

Mineralization -

Bulk density 2.3-2.4 Kg/dcm3 Technical concentration 95 % Packing 25 kg Solubility in water 1.65 at 20°C g/l Potential health effects Refer to MSDS Specific gravity

CALCIUM DI-HYDROXYDE – CA (OH)2 Density Concentration at 15°C unit

1007 7.5 g/l 1014 16.5 g/l 1020 25 g/l 1028 35 g/l 1036 45 g/l 1040 50 g/l 1050 65 g/l 1060 75 g/l 1075 94 g/l 1085 105 g/l

5.2.4. Lime milk dosing rate

(Supplier: E&H– model: model Liquisys M CPM253 + Orbisint CPS11D) (Local cabinet MCC3) The expected WTP pH of flocculation optimum values comprise from 6.5 to 7.5, under and above have negative impact on the flocculation as well as on the aluminium salts chemical precipitation. If HF-PSL-002 is ok Injection of calcium hydroxide in water is enslaved by 3 on site pH analyser as follow. CC-AIT-100 pH of flocculation line 1 control of GR-VA-004 to inlet coagulation tank 1 CC-AIT-300 ph of flocculation line 2 control of GR-VA-003 to inlet coagulation tank 2 CD-AIT-101 pH of Clarified water control of GR-VA-001 to inlet filtration CD-AIT-101 pH of Clarified water control of GR-VA-002 to outlet filtration Each valve is associated with: 1 opening and closure timer – adjustable range time 0 to 1999sec 1 adjustable time delay and step – adjustable range time 0 to 100sec




5.2.5. Lime of milk pumps process control description

2 x 3000 L/h pumps are designed for the circulation of lime milk and its injection in 4 different steps of the water treatment. 1 on duty 1 on spare Lime of milk is always circulating in a loop circuit from tank to tank and need compressed air service to open/close the lime milk pneumatic injection valves. Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of dosing is authorized by the AL2 tanks solution levels delivered by 3 floating switches level position (Supplier: BAMO) - GR-LSL-101 / 201 pump stop / run - GR-LSH-101 / 201 mixer stop/run - GR-LSHH-101 / 201 signalization liquid level in tank too high


Manual start/stop from local cabinet of the dosing pump controlled and enslaved by the installed switches level position GB-LSL-101 / 201

o Mode 3 - (local cabinet switch position on “O”) Dosing pump not working in manual as well as in automatic

1 vertical axis mixers is designed for the mixing of lime milk into each tank 1 on permanence duty (Supplier: MERSEN – model: AV/LC 1300-/1.5/65/60.3) (Local cabinet MCC3) Three different functioning modes are available as here under describes

o Mode 1 – (local cabinet switch position on “AUTO” – PLC monitoring) Automatic start/stop of mixing is authorized by the lime tank levels given by 3 floating switches (Supplier: BAMO) - GR-LSL-101 / 201 pump stop / run - GR-LSH-101 / 201 mixer stop/run (1.7m from tank bottom) - GR-LSHH-101 / 201 signalization liquid level in tank too high


Manual start/stop from local cabinet of the mixing enslaved to GR-LSH-101 / 201

o Mode 3 - (local cabinet switch position on “O”) Mixing not working in manual as well as in automatic




5.3. Chlorine gas

(See characteristics of Chlorine trade and chlorine equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE CL PR DWG 009 5) (Local cabinet MCC3)

This reagent allows the disinfection of water and thus the removal of micro-organisms. It is also necessary to maintain a minimum free chlorine concentration in the distribution network. Determining the dosage of this reagent is the role of the onsite laboratory which regularly performs the "Chlorine break-point". Once is known the chlorine dosing rate, adjusting the injection flow rate allows to obtain the efficiency treatment. Free chlorine concentration in treated water is continuously analyzed by two online chlorine analyzers at 2 different steps of the disinfection

o AC-AIT-003 Treated water outlet plant free chlorine analyzer o GL-II-002 Disinfected water outlet tank free chlorine analyser

Effects of chlorine Gas on human health 1 to 4 ppm Minimum level detectable by smell 3 to 4 ppm causes Irritation of nose, throat and eyes. 15 to + ppm causes Inflammation of eyes and respiratory system; Coughing and chest pain;

Nausea and vomiting; Prolonged exposure dangerous to life (30 60 minutes) 40 to 60 ppm causes health serious injury 100 to +ppm Human collapse and death

5.3.1. Handling chlorine gas cylinders – safety advices

Properties of chlorine Chlorine is a gas liquefied under pressure with a pungent smell. It is heavier than air, soluble in water and non flammable. It is toxic when inhaled and it irritates eyes and the respiratory tract. Chlorine reacts with the moisture in the air to form hydrochloric-acid, which can then cause excessive corrosion. Instruction Only instructed staff should handle gas cylinders containing chlorine. Instruction should be repeated at least once a year and should be based on the operating instructions.

LETHAL SUBSTANCE WARNING




Storing chlorine cylinders When chlorine cylinders are stored, the valve cap nut should be attached securely together with a suitable seal and the protecting cap screwed on. Filled and empty gas cylinders should be stored separately. To prevent dangerous heating of the chlorine cylinders, they should be kept out of direct sunlight and should be stored at a distance of more than 0.6 m away from radiators. Furthermore, the technical regulations on compressed gases (TRG 280) and the Lined Safety Advice 21 on» Storing gas cylinders» should be observed. Handling chlorine cylinders Chlorine cylinders should not be thrown and should be protected to prevent them from falling over. Chlorine cylinders should be connected in an adapted position so that only gaseous chlorine can be delivered - unless the equipment is designed for the delivery of liquid chlorine. Chlorine cylinder valves Valves on chlorine cylinders should be operated by hand and without the use of force. The valves of filled or empty chlorine cylinders should always be closed securely with the correct cap nut (embossed with chlorine or Cl2) and a suitable seal. Precautions during delivery of chlorine (The following precautions are listed as examples.) Technical precautions: • Ventilate chlorine rooms adequately. • Use only suitable and tested chlorine gas equipment. • Use only approved gas warning equipment and water spraying equipment (external operation). • Ensure that there are short escape routes into the open. (Escape doors must open outwards.) • Renew the connection seal every time the chlorine cylinders are exchanged. Organizational precautions: • Mark all equipment and rooms to indicate that chlorine is present. • Display and observe the operating instructions in accordance with the regulations on hazardous substances. Also display an alarm plan. • Ensure that filled and empty cylinders are definitely separate. • Make available emergency protecting caps for the valve region of chlorine cylinders. • Use ammonia for example to test chlorine equipment for leaks. Personal precautions: • When exchanging chlorine cylinders, use a suitable breathing mask with filter (Perform vacuum and pressure tests wearing a breathing mask.) • Do not store opened breathing filter for longer than 6 months Sealed breathing filters can be stored until the storage date expires. • Use suitable protective gloves and shoes Procedure in the case of a chlorine leak • Proceed according to alarm plan. • Inform a second person. • If the leaking chlorine gas cannot be controlled using the water spray equipment, call the fire brigade immediately and inform them that chlorine gas is leaking. • If the chlorine concentration is above the maximum workplace concentration level (0.5 ppm), use suitable compressed air breathing apparatus and a protective chemical suit. The protection equipment mentioned in 6 above is not sufficient.




First aid • Persons who have inhaled chlorine gas require immediate medical attention. • Taking care not to endanger themselves, rescuers should move injured persons to a site with fresh air. Should the injured persons not be breathing, artificial respiration is necessary. Otherwise, they should be made to inhale nebulae dexamethasone. • If chlorine comes into contact with eyes or skin, it should be rinsed off immediately with plenty of water and a doctor should be consulted. • Contaminated clothing should be removed immediately.

5.3.2. Chlorine bio-chemical disinfection principle

Chlorine is the disinfection agent currently used to destroy pathogenic organism that may exist in lake water discharges

Figure 1: Pathogenic organism

It is a powerful anti-bacterial and strong corrosive agent. When mixing with water it form hypochlorite acid, a strong disinfection agent. Disinfection is a necessary activity to ensure a safe water supply. However, chlorine is recognized as a dangerous chemical having potential impact on human health and safety as well as on the environment. Chlorine kills pathogens such as bacteria and viruses by breaking the molecular internal chemical bonds. Chlorine compounds can exchange atoms with other compounds, such as enzymes in bacteria and other cells. When enzymes and chlorine come in contact, one or more of the hydrogen atoms in the molecule are replaced by chlorine. This causes the molecular to change of shape or collapses. When enzymes do not function properly, the cell or bacteria will die. When free chlorine is added to the process, it takes various forms in relation with the pH and water quality. Here under is description of different chemical forms of chlorine inducing different disinfecting capability. Chlorine add in water forms Hypochlorous acid (HOCl = High disinfection power) Cl2 + H2O -> HOCl + H+ + Cl- Depending on the medium pH value, Hypochlorous acid change to hypochlorite ion; (OCl- = low disinfection power) Cl2 + 2H2O -> HOCl + H3O + Cl- HOCl + H2O -> H3O + Cl- This is due to chlorine and oxygen atoms: OCl- -> Cl- + O

Hypochlorous acid decrease when pH increases

pH HOCl OCl- 6 95% 5%

7,5 50% 50% 8 20% 5%

Both substances have very distinctive behaviours; o Hypochlorous acid (HOCl) is more reactive and is a stronger disinfectant than hypochlorite. o Hypochlorous acid is split into hydrochloric acid (HCl) and oxygen atom (O). The oxygen atom is

a powerful disinfectant. The disinfecting power of chlorine in water is based on the oxidising power of the free oxygen atoms and on chlorine substitution reactions. Optimal effect of chlorine for disinfection will occur when the




water pH is between 5.5 and 7.5. Hypochlorous acid (HOCl) reacts faster than hypochlorite ions (OCl-) and it is 80-100% more effective. Chloramines effect Chloramines (monochloramine) are an inorganic compound with the formula NH2Cl. Generating odor and flavours of the water when chlorine is used as a disinfectant. When ammonia is present in water Hypochlorous acid HOCl will react to form three types of chloramines depending on the pH, temperature, and reaction time:

o Monochloramine is formed at pH range from 7 to 8.5. Ammonia + Hypochlorous acid monochloramine + water

Monochloramine is more present when the pH is above 8. o Dichloramine is formed at pH 3 to 7

Monochloramine + Hypochlorous acid dichloramine + water

o Trichloramine is more present when the pH is below 4.5 (producing a very foul odor) Dichloramine + Hypochlorous acid Trichloramine + water

Chloramines are an effective disinfectant against bacteria but not against viruses. It is necessary to prevent the chloramines formation and create some other stronger disinfectant forms by adding more CL2 in water. Free chlorine reacts with the chloramines in order to produce hydrogen ion, water, and nitrogen gas. Concerning the monochloramine, the following reaction occurs:

2 2 22NH Cl HOCl N 6HCl H O

Therefore, adding free chlorine reduces the chloramines concentration in the disinfection process as follow: I – chlorine is reduced into chloride form II – chloramines are formed III- destruction of chloramines converted into nitrogen gas that degassing (break-point) IV – zone of free chlorine residual available for disinfection

5.3.3. Break-point allows to calculates the chlorine gas dosing rate

The international term "breakpoint" has the advantage of being concise and vivid. The ordinate low point of the curve is showing the residual contents of free chlorine. And at the abscissa (amount of added chlorine), the point from which appears a residual content of "free chlorine." The first part of the curve corresponds to the formation of mono, Di and Trichloramine. Their destruction demands to add total chlorine. Second part of curve shows that total chlorine concentration is decreasing to break-point cited above and from which all added chlorine becomes free chlorine available for the disinfection. Vertical gap between total chlorine dosing in abscissa and the break-point corresponds to the presence of trichloramines non reducible by chlorine. Excessive chlorine dose reflects a very bad quality of the RW. The breaking point is therefore even lower than the water impurities are oxidized by chlorine. This curve shows that it must add chlorine to reduce the content of chloramines.

3 2 2NH HOCl NH Cl H O

2 2 2NH Cl HOCl NHCl H O

2 3 2NHCl HOCl NCl H O




Trichloramines are removable by aeration of the water. The reactions leading to the breakpoint demand 1 minute… up to 3 hours ... depending on the nitrogen water contents to be oxidized, its concentration, the pH and the temperature of water. It is this knowledge that determines the importance of the contact time. So it is important to carefully analyze each of these parameters. The breakpoint consumes 8 to 10 times by chlorine, the amount of nitrogen to destroy. The break point research must be performed away from sun light for best results.

5.3.4. Chlorine gas storage building, dosing, neutralization room, and chlorine gas leak detection

5.3.5. Chlorine gas dosing regulation description

(See characteristics of Chlorine installed equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE CL PR DWG 009 5) (Local cabinet MCC3) Dosing and concentration of Cl2 gas into motive water is depending of the raw water variable quality, (NTU; pH; temperature; TSS contents…) this is regularly controlled by the lab performing the water chlorination demand (break point). Once is known the free chlorine dosing rate in g/m3 it is the role of the lab technician to adjust the

chlorine dosing set point (expressed in mg/l) on GL-II-002 Cl2 free chlorine in water analyser/regulation

located in the chlorine dosing room.

It would be an utopian to believe that there is a few or no chlorine gas leaks in facilities production of drinking water. Indeed, it is not uncommon that a small cloud of chlorine gas is present when connecting a container. In fact, it was during this operation that it is most possible that worker is exposed to chlorine. In RE building and dosing room is installed 2 permanents Cl2 gas leak detection including 4 Cl2 detection probes allowing the gas detection within 4 distinct areas. Detection level 1 set point set at 2.0ppm Detection level 2 set point set at 3.0ppm




Two (2) free chlorine analysers at different places and at 2 different times after the chlorine injection point are installed as follow: (See characteristics of tanks and equipments pages 20 to 26 of this document)

o Cl2 injection point outlet of filtered water tank Time 0

o GL-II-002 analyzer of Cl2 free at the outlet of the disinfection tank Time 0 + 60mn at 1 000m3/h Time 0 + 30mn at 2 000m3/h Adjustment of the residual free chlorine set point (SP) Chlorine dosing rate regulation

o AC-AIT-103 analyzer of Cl2 free in treated water outlet the plant Time 0 + 400mn at 1 000M3/h Time 0 + 200mn at 2 000m3/h

Chlorine gas dosing expressed in kg/h according with Break-point and filtered water flow rate

Chlorine demand - mg/l 1000m3/h 2000m3/h

0 0 kg/h 0 kg/h 2 2 kg/h 4 kg/h 4 4 kg/h 8 kg/h 6 6 kg/h 12 kg/h 8 8 kg/h 16 kg/h

10 10 kg/h 20 kg/h

5.3.6. Chlorine gas dosing and injection principle

The water disinfection is performed using chlorine supplied by twin 2x1000kg cylinders of liquefied chlorine gas pressurized at 19barg. Once cylinders valves and auxiliary manual valves opened, the chlorine manifold tanks are filled with gas pressurized at possible 20barg (cylinder 100% full) upstream the installed full vacuum metering gas unit. Attention: In connecting the drums, it shall be ensured that the gas port is connected, and not the liquid chlorine port, if no evaporator is employed. The drum is marked with a transverse stripe on the front end face. It shall be positioned in the support in such a way that this marking stripe is horizontal. The upper connecting port is employed for withdrawing chlorine gas; New sealing elements shall always be employed for connecting the piping and valves. The flexible copper connecting lines shall be inserted with great care into the threaded unions with cutting ring. Upper connecting port for chlorine gas Colour mark Lower connecting port for liquid chlorine




The full vacuum gas metering unit has been designed in such a way that the chlorine gas is initially shut off at the intake valve. Chlorine gas can flow at the desired rate only if a vacuum is generated at the injector after opening the motive water supply line. The vacuum causes a pressure difference in the unit with respect to the atmosphere; The action of this pressure difference on a diaphragm opens the intake valve. The flow rate of chlorine is adjusted by means of the control valve on the flow meter sight glass. The chlorine gas is drawn by suction through the back pressure regulator, which compensates for fluctuations in the injector suction rate, and is dissolved in the motive water there. The chlorine solution then flows to the injection site and is added to the water being treated Chlorine dosing flow rate (kg/h) is controlled by control valve, controlled by the controller for free chlorine (7). The already chlorinated water is measured. Faulty metering due varying suction capacity of the ejector is corrected by the controller. Therefore no back-pressure regulator is required for this type of installation. Automatic metering Normally the control valve does not require any service during operation. A routine visual check is, however, recommended. The withdrawal of one cylinder of chlorine gas is defined in the norm as 1% of the volume of the cylinder. With a tank of 1 000 kg, the withdrawal of one cylinder of chlorine gas is 10 kg/h. When the temperature in the room decreases, there is a risk of hoarfrost on the equipment. This risk of hoarfrost increases with the quantity of chlorine gas to be extracted from one cylinder. So, based on theirs experiences, suppliers limit the quantity of chlorine gas to be extracted from one tank in a given temperature. For an extraction of 6,3 kg/h (chlorine gas for 10 MGD), the minimum temperature recommended by the supplier is 10 °C. In order to avoid this risk of hoarfrost, two solutions are possible: - increase the temperature in the room, - decrease the quantity of chlorine gas to be extracted from one tank. Two solutions have been selected: - Heating belts have been installed at the outlet of chlorine cylinders, - Each chlorinator of the chlorination system will be connected to two tanks.




5.3.7. Chlorine gas dosing equipments description

The automatic dosing of Cl2 gas is performed by the prominent regulation system comprising the following and specific instruments that require a very particular attention from operations. GL-BR-001 (Supplier: Prominent – model J/23122256) Vacuum hydro injector Model Standard Ejector for back pressure of up to 8 barg. Material PVC, PN16 Design Suction of ejector is determined by the water pressure behind & front of Ejector Water connection PVC-threaded union dia. 40 mm / DN32 Gas connection G 2’’ Max. Suction power 20 kg/h Cl2 Max. Backpressure 8 bars 1 Ejector non-return valves without back pressure regulator – J/23222262 Ejector non-return valves prevent water from entering vacuum chlorinators; if the motive water supply to the ejector is switched off or fails. Vacuum breakers prevent undesired chlorination due to siphoning Water pressure max. 16 bar Temperature max. 35 °C Materials PVC / FPM Max. Capacity 15 kg Cl2/h Ejector connection G 2’’ Gas connection 12/16 PE tubing 1 Pressure reducing valve G 1"1/4 – J/22913622 Application to set the optimum ejector inlet pressure in the case of fluctuating inlet

pressure in the ejector line with solenoid valve to switch the ejector ON / OFF Material brass, PVC Reduced pressure 1.5...6 bar (higher pressure levels upon request) Max. Inlet pressure 16 barg Equipped with Shutoff valve, pressure reducer with strainer and pressure gauge 0...10 bar,

solenoid valve 230 V, 50-60 Hz Connection for water supply: G 1 1/4 F - Water supply: 6 m3/h max GL-VA-008 (Supplier: Prominent – model Sauter J/20700035) Automatic CL2 gas dosing control valve Model 4…20 mA (24 VAC) Technical datas 4…20 mA 24 VAC Power supply 24 V 50/60 Hz Input signal 4…20 mA Capacity 0,5 …10 kg/h Transit time 120 s Position feedback 0…620 mV Protection class IP 55 Ambient temperature 0…50 °C

The GL-VA-008 control valve is electrically adjustable PVC valve that dosing chlorine gas under vacuum. It allows a continuous and proportional dosing rate of the gaseous chlorine actuated by a servomotor controlled by a 4-20 mA loop signal sent by GL-II-002. The chlorine gas flow rate is proportional to the setting value. The valve can be manually in open position to allow the manual dosing.




GL-FI-001 (Supplier: Prominent – model J/25100019) Flow meter sight glass range is 0…10 kg/h

Used for the accurate and continuous adjustment of the chlorine dosing rate. Cl2 gas dosing rate is manually adjusted with a needle valve. The graduated measuring glass length is 300 mm. GL-II-002 (Supplier: Prominent – model DACA 10 Free chlorine in water analyser and Cl2 concentration regulation Flow housing module (Supplier: Prominent – model DGMA 301T000) GL-II-002 includes a probes measuring chamber 1 Chlorine sensor CLE 3.1 mA - 5 ppm Measured variable free chlorine (Hypochlorous acid HOCI) with large proportions of bound chlorine; to detect bound chlorine using D2CA and Sensor for Total Chlorine type CTE 1-mA Reference method DPD1 pH range 5.5 …8.0 Temperature 5 …45 °C Max. Pressure 1.0 bar Measuring range 0.01…5 mg/l Intake flow 30…60 l/h Supply voltage 16…24 V DC (two-wire technology) Output signal 4…20 mA ≈measuring range Measuring and control equipment Measuring principle amperometric, 2 electrodes, diaphragm-covered GL-VA-005 (Supplier: Prominent – model C 7522) Chlorine gas cylinders change-over equipped with negative pressure gauge It is an automatic source changeover of chlorine gas under vacuum. Chlorine metering facilities are designed with two chlorine units (cylinder batteries). It allows for the automated operation of the system 24/24. The inverter is required for the automatic switching on the reserve battery. The inverter is equipped with a microprocessor activated by the control unit which also allows manual operation and a drawing off cylinder units display and a vacuum indicator contact and two taps to motorized ball valves, in case disengage able emergency. The two chlorine cylinders are used simultaneously to cover high need of chlorine. GL-VA-003 & GL-VA-004 (Supplier: Prominent – model C 2525-V) Vacuum regulation equipped with chlorine positive pressure gauge C 2525 V Pre-regulator of vacuum up to 25 kg Cl2 / h It is mounted on a wall panel and a safety pressure safety valve is integrated in the device




GL-VA-001 & 002 (Supplier: Prominent – model J/22300062) Motor ball valves for chlorine line 1&2 installation isolation These automatic closing/opening valves are enslaved to the gas leaks detector. They are closing in case of leak only in order to isolate the Cl2 cylinders from circuit. GL-SV-001 & 002 + GL-HA-003 & 006 (Supplier: Prominent – model Liquid/gas separator chamber equipped with its electric heater belt The smallest loss of energy instantly causes the appearance of liquid chlorine. Such energy loss is recognized when for example the temperature of the downstream pipes of the chlorine cylinders is smaller than the liquid chlorine present in cylinders. It is important to know that this condition can occur at any temperature. The here above mentioned loss of energy can be offset by energy input from a heating unit Cl2 pressure reducer Generally, pressure reducers are used to prevent re-liquefaction of chlorine, to avoid damaging PVC parts. They reduce the pressure until the re-liquefaction of chlorine in the downstream pipe is not possible except at negative temperature well below 0 ° C. These temperatures are not allowed in the technical building for chlorination. The elemental liquid chlorine does not attack non-alloyed steel. But it attacks the PVC, which loses its original shape. As the chlorine metering devices are made of PVC, it is essential to avoid PVC parts are in contact with liquid chlorine Attention Do not confuse the liquid chlorine with chlorine gas dissolved in water. Indeed, the chlorine solution in water is well tolerated by the PVC. If the saturated chlorine gas taken from the gas tanks retain its gaseous state, no problem, but in some thermal conditions, chlorine gas condenses again it will result damage may be caused in facilities and equipment downstream. The pressure reducer reduces the pressure until the re-liquefaction of chlorine in the line downstream only possible well below 0 ° C. The advantage is that the pressure downstream reducer need not be constant, and its absolute height is not important; Indeed, it is important only that this pressure is clearly lower than the pressure in the liquid chlorine cylinders. The pressure reducer is set to work from 1.5 to 2.5 barg. Cylinders weighing balances The actual content of a chlorine cylinder can only be defined in determining the weigh of it. The residual content of a cylinder is crucial for the continuous dosing without interruption. Cylinders weighing systems allow, in addition to placing the cylinders in a secure position, indicate the chlorine content on an installed analogical display apparatus.




4 Chlorine manifold for tanks (1000 kg) – J/22501024 Basic version without angle and auxiliary valves, without dripleg 8 Assembly kit for flange DN25 – J/38712 4 Auxiliary Valves (isolating valves) – J/22338698 Connection cylinder/tank: BSW 1 1/4" (DIN 4676) Application Cylinder and tank auxiliary valves are connected to the cylinder

or tank valve of the pressure container. when the cylinder is exchanged, cylinder and auxiliary valves are closed and thus prevent residual chlorine gas from emerging and humidity from entering the chlorine gas installation. Model slowly opening angle valve with gland sealing Connections Tank connection with union nut or Yoke Outlet of valve G 5/8 Male with connection to flexible connecting pipe Materials Base body: Bronze Spindle Monel Gland PTFE Gasket special PTFE

5.4. Caustic soda

(See characteristics of Cl2 neutralization and installed equipments pages 20 to 25 of this document) (Refer to doc n°: VPK001 DTE FI PR DWG 009 3) (Local cabinet MCC3)

5.4.1. Chlorine gas neutralization tower chemical process description

Sodium hydroxide (NaOH or caustic soda) is used to neutralize the chlorine as per the following reaction:

NaOH + Cl2 --> NaOCl + HCl

HCl + NaOH --> NaCl + H2O

2NaOH + Cl2 -> Na Cl + NaOCl + H2O + Heat

Therefore no chlorine gas is relieved in the environment as Caustic Soda reacts with the chlorine and

creates:

sodium chloride (NaCl),

sodium hypochlorite (NaCLO)

water (H2O)

NaOH solution absorbs carbon dioxide from air, and crystallizes at low temperature. To minimise crystallisation the recommended concentration of the caustic soda solution is 20%.




5.4.2. Caustic soda neutralization tank solution concentration

(See characteristics of neutralization equipments pages 20 to 26 of this document) (Refer to doc n°: VPK001 DTE CL PR DWG 009 5) (Local cabinet MCC3)

Les lésions peuvent être cutanées, oculaires, digestives ou respiratoires. Preparation of the solution is manual under the LAB control and managing. Fill tank up to Pour the liquid buckets contents into the tank avoiding bucket going into tank. When dissolution of chemical is complete, stops the circulation pump. Tank is ready for operation Commercial Caustic soda tank solution preparation calculation Number of tank 1 Concentration of solution desired expressed in NaOH 185 g/L Surface of tank 8.3 m² Duty water High of tank 1.1 m Duty volume of tank 9 000 L Total volume of tank 11 600 L Weight of reagent required 1 665 kg Volume of one caustic soda jerry-cans 30 L Weigh of one caustic soda jerry-can 36.0 kg Weigh of technical product in one jerry-can Required number of jerry-cans for the solution preparation 47 Volume of poured caustic soda into neutralization tank 1 400 L Corresponding liquid level in the tank 0.20 m Control the caustic soda solution preparation When caustic soda dissolution is complete (after 1 hr mixing time) it’s necessary to control the concentration to confirm that Cl2 gas neutralization dosing will be according with the LAB specifications. We recommend using density meter range 1000 to 1200 For this purpose here under see the following chemical information’s:

CAUSTIC SODA liquid form NA(OH) unit

Supplier SITARA chemicals industries Aspect Clear viscous liquid Odour None Use Cl2 neutralization Bulk density 1.20 Kg/dcm3 Technical concentration 50 % Packing plastic drum 30 kg Solubility in water 715 g/l Potential health effects Refer to MSDS Specific gravity 1.50 to 1.60

CORROSIVE BASIC SUBSTANCE WARNING




CAUSTIC SODA liquid form NA(OH) Density Concentration at 15°C unit

1100 99 g/l 1120 121 g/l 1140 143 g/l 1160 167 g/l 1180 191 g/l 1200 216 g/l

The dissolution of the sodium hydroxide in water may be accompanied by an exothermal reaction

5.4.3. Cl2 gas neutralization process description

Cl2 gas detection level 1 set at 2.00ppm Cl2 gas detection level 2 set at 3.00ppm Chlorine gas leakage in chlorine storage room or in dosing room is sucked by a vacuum fan to the bottom of a neutralization tower. Neutralization solution is pumped from the neutralization tank to the top of neutralization tower. After contact with chlorine in the tower, neutralization solution is collected by gravity from the bottom of the tower to the neutralization tank. The neutralisation solution is a sodium hydroxide solution to transform gaseous chlorine into sodium hypochlorite Continuous leakage monitoring is realized by two leakage detectors: one in the chlorine storage room and the other in the dosing room. Neutralisation solution is prepared in neutralisation tank to be able to neutralize chlorine leakage at any time. When chlorine leakage is detected, the suction fan and the recirculation pump are started to suck and neutralise gaseous chlorine. Operator has to find and close the leakage using safety equipments and following procedure. The control of neutralisation unit is realised in local electric cabinet to stay available in case of PLC fault. The ventilation rate is calculated based on 10 m3/h/m2 of building to which is added the volume of chlorine to be absorbed in one hour. The quantity of chlorine to be absorbed being 420 kg / h and the maximum density being 2.94, the volume of chlorine to be absorbed in one hour is a maximum of 143 m3.




5.5. Polymer

(See characteristics of Polymer trade and installed equipments pages 20 to 25 of this document) (Refer to doc n°: VPK001 DTE RE PR DWG 008 4) (Local cabinet MCC3) On our WTP the polymer is used for two (2) purposes here under described: 1 – The RW flocculation 2 – The sludge thickness and dehydration

5.5.1. Polymer equipments

The polymer chemical product is supplied to the WTP storage building under powder form and 25kg packing. It will be transformed into a 3% to 5% maximum concentrated solution in order to be pumped and injected using dosing pumps and according with the selected dosing rates resulting of the jar test trials.

1 polymer preparation skid for the 2 purposes

Determining the dosage of polymer is the role of the site laboratory which regularly performs jar test trials as described in this document. Once is known the dosing rate we can set the appropriate adjustment of dosing pumps.

5.5.2. Polymer flocculation dosing pumps characteristics

(Supplier: Grundfos – model: DMX 249/3 - double head) (Local cabinet MCC3) Number of dosing pump 2 x (double head) Adjustable flow rate per head 0 to 249 L/h Adjustable stroke rate 0 to 100% Maximum working pressure 3.0 barg Pump VSD adjustment 50 Hz Concentration of polymer solution 4.0 g/l Calculation of polymer dosing flow rates according with dosing rates and 47 856m3/d

Polymer dosing rate

g/m3

Raw water inlet flow rate

m3/h

Injection flow rate

L/h

Injection flow rate

L/d

Polymer weight

kg/h

Polymer weight

kg/d

Pump stroke rate

0-100%

0.1 1994 50 1 200 0.2 4.8 10% 0.2 1994 100 2 390 0.4 9.6 20% 0.3 1994 150 3 590 0.6 14.4 30% 0.4 1994 199 4 790 0.8 19.1 40% 0.5 1994 249 5 980 1.0 23.9 50% 0.6 1994 299 7 180 1.2 28.7 60% 0.7 1994 349 8 370 1.4 33.5 70% 0.8 1994 399 9 570 1.6 38.3 80% 0.9 1994 449 10 770 1.8 43.1 90% 1.0 1994 499 11 960 2.0 47.9 100%

According with the dosing pumps characteristics and with 1.0g/m3 as it is the maximum designed dosing rate, the polymer solution shall be concentrated at 4.0g/l




5.5.3. Polymer sludge conditioning dosing pumps characteristics

(Supplier: Grundfos – model: DMX 52-8 single head) (Local cabinet MCC3) Number of dosing pump 4 x (single head) Adjustable flow rate 0 to 52 L/h Adjustable stroke rate 0 to 100% Maximum working pressure 8.0 barg Pump VSD adjustment 50 Hz Concentration of polymer solution 4.0 g/l Calculation of polymer dosing flow rates according with dosing rates & 3 544m3/d sludge flow

Polymer dosing rate

g/m3

Sludge flow rate m3/h

Injection flow rate

L/h

Polymer weight

kg/h

Working time h/d

Injection flow rate

L/d

Polymer weight

kg/d

Pump stroke rate

0-100%

1.0 100 25 0.10 24 600 2.40 48% 200 50 0.20 18 1 200 4.80 48% 300 75 0.30 12 1 800 7.20 48%

1.5 100 37 0.15 24 888 3.55 72% 200 75 0.30 18 1 776 7.10 72% 300 112 0.45 12 2 664 10.65 72%

2.0 100 50 0.20 24 1 200 4.80 96% 200 100 0.40 18 2 400 9.60 96% 300 150 0.60 12 3 600 14.40 96%

2.5 100 62 0.25 24 1 488 5.95 120% 200 124 0.50 18 2 976 11.90 120% 300 186 0.75 12 4 464 17.85 120%

Calculation of polymer dosing flow according to 15g/l sludge thickness and RW turbidity

RW turbidity

Sludge volume m3/d

Dosing working

time h/d

Injection flow rate

L/h

Injection flow rate

L/d

Polymer weight

kg/h

Polymer weight

kg/d

Pump stroke rate

0-100%

200 3 544 18 250 4 250 21 300 4 955 350 5 661 400 6 131 450 6 837 500 7 543 550 8 013 600 8 954 650 9 424 700 10 130

Note: (refer to page 49) Maximum capacity of recycling the sludge from RT to drying bed: 40T/d and 6100m3/d at 7.0kg/m3 Estimation of total volume of sludge routed to the sludge pit per day according to sludge thickness. RW NTU

CW NTU

RT total KG/d

RT total m3/d

Sludge kg/m3

Sludge m3/d

Pump hr/d

Sludge kg/m3

Sludge m3/d

Pump hr/d

Supernatant m3/d

350 10 34 932 5 661 15 2 328 23.3 20 1 746 17.5 3 333 3 915 400 10 39 718 6 131 15 2 647 26.5 20 1 985 19.9 3 484 4 146 450 10 44 505 6 837 15 20 2 225 22.3 4 509 4 612 500 10 49 292 7 543 15 20 2 464 24.7 5 215 5 318




5.5.4. Polymer solution preparation

(Supplier: Grundfos – model: POLYDOS 412 ECO) (Local cabinet MCC3) Polydos 412A is a fully automatic system for the continuous preparation of polymer solutions. The polymer is diluted with water in a concentration set at the control panel. The maturing time of a polymer solution depends on the extraction quantity and the capacity of the Polydos system. Polydos 412 ECO is requiring to be filled with Polymer powder and 3barg minimum water pressure. The preparation is under the LAB control and managing Pour the 25kg chemical powder bag contents into the hopper for powder avoiding part of bag going into tank. Characteristics of POLYDOS 412ECO 1000 - Preparation output 1000L/h - Maturating period 45mn mini - Adjusted low of supply water 2000L/h - Adjusted pressure of supply water 1 to 2barg - Polymer granulate dispensing output 24kg/h max - Liquid polymer dispensing output 10 - 50 L/h - Concentration of the solution 0.1% to 0.5% - B 1252mm - L 2200mm - h.1 766mm - hopper for powder capacity 100L Through flow principle Polydos systems prepare a polyelectrolyte solution in a container divided into 3 chambers. Preparation, maturity and extraction take place in a continuous process. The solution freshly prepared in the first chamber flows via the partitioning wall between 1st and 2nd chamber into the maturing chamber and forces the matured solution into the third chamber. Slight solution mixing could take place due to the forcing. This means that not the fully matured solution could arrive in the extraction chamber. Process description After switching on the power supply (turn on main switch), PLC and display carry out a warm-up test and the PLC automatically switches on the RUN mode. Since the corresponding process parameters for the dispensing, solution concentration etc. have not yet been entered, the alert flashes on the display. The fault will disappear once all preparations for commissioning are completed and the acknowledgement is carried out. Automatic operation There are important requirements for error-free system operation. The system should be set up and installed according to instructions. It is indispensable to set the operating parameters and calibrate the dispensing units with precision. Operation of the system is permitted for trained persons only, who are familiar with the system. At the same time, the operating personnel's task is primarily restricted to filling the reserve funnel with dry substance, changing the delivery cask, eliminating faults in the event of breakdown and maintenance




work on the system. Furthermore, the personnel is responsible for checking processes regularly and that all system parts function properly. - Unbolt the main switch on the switching cabinet. - Pour in dry substance. - Open water apparatus shut-off valve. - If necessary, acknowledge or eliminate all breakdowns.

- Press to launch automatic operation. The report: Polydos: AUTO appears on the display. The polymer dissolution process runs according to the diagram in 5.2. All processes are monitored and checked by the controls. Always refer to the vendor instructions before any intervention. Process parameters Conc.: 0.40 % Enter the desired concentration of the finished solution in %. The input range is min. 0.1% and max. 0.5%. DL TD: 0.0 kg/h Enter the calculated dispensing output of the dry substance dispenser in kg/h. This value is of no significance for the Polydos 460ECO system. DL FPP: 0.0 l/h Enter the calculated dispensing output of the liquid polymer pump (concentrate pump) in l/h. FP conc.: 0.00 % Enter concentration of the parent solution in %. FI++ H2O: 0 l/h Maximum permitted water through flow. This value is calculated by the controls, depending on the entered dispensing output of the dry substance dispenser and the concentration of the solution / dispensing output of the concentrate pump, the concentration of the parent solution and the concentration of the finished solution. If the actual through flow exceeds this threshold, the system, in automatic mode, switches off on a time delay. F--H2O: 0 l/h Minimum permitted water through flow. This value should not be lower than the system's output. If the through flow falls short of this threshold, the system, in automatic mode, switches off on a time delay. LSHH: 0 % Filling status threshold overflow. If the filling status reaches or exceeds this value, the controls switch off the preparation process on a time delay. The collective fault is issued. Time delay: 3 sec. LSH: 0 % Filling status threshold for MAX. If the filling status reaches or exceeds this value, the controls stop the preparation process on a time delay. Time delay: 3 sec. LSL: 0 % Filling status threshold for MIN. If the filling status reaches or falls short of this value, the controls launch the preparation process. Time delay: 3 sec. LSLL: 0 % Filling status threshold for dry run. If the filling status reaches or falls short of this value, the controls launch the preparation process and issues the collective fault report on a time delay. Time delay: 3 sec.




LI X: 0 Displays the analogue value of the filling status in digital form. The ultra sonic sensor measures the distance between the sensor head and the solution surface. This value is then processed in the PLC and shown as the filling status on the display. The zero point (W) must be set or checked in order to guarantee correct evaluation. LI W: 0 The 3rd chamber must be empty. X is the digital value of the distance between the sensor gauging head and the container bottom. Compare the W value with the X value. The W value must be higher than the X value by about 200. If that is not the case, change the W value. Add the number 200 to the W value and enter the calculated value in the W field. This causes the zero point to be set a bit deeper than the container bottom in order to avoid potential calculation errors or PLC memory overrun. Function: TD ( 0 ) Dry polymer preparation FP ( 1 ) Liquid polymer preparation Software-enabled switching between the system’s preparation possibilities using dry substance or liquid polymer. The switching is not possible with Polydos 460ECO systems. For Polydos 412ECO systems it is also necessary to switch the switch at the front on the door of the switching cabinet to the correct / corresponding mode.

5.5.5. Calculates the dosing rate

Raw water flocculation treatment dosing rate is determinates by the LAB jar testing on site. According with the dosing rate we calculate the dosing pump injection flow rate as follow:

5.5.6. Adjustments of the water dilution

5.6. Estimation of the annual consumption of reagents on the WTP




6. WATER ANALYSIS (See characteristics of installed instruments pages 11 & 20 to 26 of this document) A human drinking water should not run direct or indirect risks for health. The water quality should be guaranteed to the consumer. Drinking water analyse comprising 3 main categories of parameters as follow; Physic-chemical parameters of water; They are characteristics of the water such as pH, temperature, etc. These characteristics are related to the natural structure of the water. Microbiological parameters; the water should be free of pathogenic bacteria and viruses. Organoleptic parameters; These parameters include colour, transparency, flavour and odor of the water. However these criteria have no direct health value. Water may be cloudy, coloured or have a particular smell and still be drinkable.

6.1. WTP onsite water analyses Online Water analyzers are installed on plant continuously providing water parameters to SCADA. These parameters are indispensable for the plant water production operations.

RW - pH, turbidity, temperature, TDS

Flocculation - pH, temperature

CW - ph, turbidity, temperature, TDS

Disinfected water - Cl2 free

TW - pH, turbidity, temperature, TDS, Cl2 free One WTP onsite laboratory is basically equipped to perform the following analyses;

6 beakers jar test

pH, Temperature, Turbidity, Conductivity, dissolved oxygen, TDS, colour,

Free and total chlorine in water

Silica range 0.2 to 50ppm

TH.ca range 2.0 to 60°f

TH.total range 1.0 to 60°f

TAC range 2.0 to 240 °f

6.2. External laboratory analysis Periodically samples of treated water shall send to an external and official governmental laboratory in order to perform WTP contradictory and complementary water analyses. This procedure is legal and obligatory.




6.3. WTP current analysis descriptions TSS This is the organic and mineral total suspension in water. It is measured by filtration and match with the pollution solid. TSS is expressed in mg / l (milligrams per liter) Dry matter Is TSS heated at a temperature of 105 ° C then measured. Dried matter is expressed in mg / l. SLUDGE MLVSS The volatile suspended solids is TSS that can be volatilized at a temperature of 550 ° C. The MLVSS correspond to organic matter. MLVSS is expressed in mg / l. PH It is the acidic or basic potential of a solution. The pH scale ranges from 0 to 14, pH neutrality is 7. There is no unit for pH It is noted from 0 to 14 Nitrogen N There are 5 forms of nitrogen • Organic nitrogen, constituting the living vegetal or animal cells. • Ammonia NH4 (decomposition residual of organic nitrogen) • Nitrite NO2 always in a few quantities due to their unstable form • Nitrate NO3 stable form, Its presence in water present a nuisance by promoting an excessive growth of algae in water (eutrophication). • Nitrogen gas N2 present in the air (70% N2 for 20% oxygen). Slightly soluble in water its amount is expressed in mg / l (milligrams per litter). The RH2-or red-ox potential of electronification Red-ox potential measures the reducing or oxidizing degree of water medium expressed in mV. A negative potential indicates that the solution acts as a reducing agent. Dissolved oxygen <1 mg / l A positive value indicates that the solution acts as an oxidant. Dissolved oxygen> 1 mg / l TOC it is the carbon organic contents in water by measuring CO2 contents after complete oxidation. O2 Oxygen in water allows the process of oxidation of organic matter, but this decomposition depletes oxygen in the aquatic environment. Oxygenation of the water first comes from the contact of its surface with the atmosphere. It is favoured by the whirlpool, waterfalls and water temperature. Solubility of oxygen varies with temperature: at 5 ° C: dissolved oxygen maximum 12.3 mg / l at 10 ° C: 10.9 mg / l at 15 ° C: 9.7 mg / l at 20 ° C: 8.8 mg / l at 25 ° C: 8.1 mg / l at 30 ° C: 7.5 mg / l at 35 ° C: 6.9 mg / l at 40 ° C: 6.4 mg / l




Conductivity This is a measure of the ability of a solution to allow the passage of an electric current. This ability depends on the water-soluble salts contents and on the temperature. Conductivity measurement in the laboratory is used to firstly, establish the degree of mineralization and assess the concentration of dissolved minerals in water. However this measure is used in the focus to detect pollution than the other parameters have not highlighted (case of heavy metals dissolved in water for example), or also to confirm an opinion. The unit of measurement is: μ Siemens/cm or ohm/cm Turbidity It is a parameter which varies with colloidal compounds (size <1μm) and humic acids (degradation of plant) as pollution that cloud the water. The resistance that water opposes to passage of light gives a value expressed in NTU NTU <5 = clear water NTU <30 = slightly turbid water NTU> 50 = Cloudy water. Major turbidity causes a reduction in transparency of water KH Alkalinity informs that water contents strong bases and carbonates. Its analysis is performed using phenolphthalein which turns from colourless to pink-fuchsia at pH 8.2. Alkalinity is expressed in French degrees (° f). °f = 3.4 1 mg/l of hydroxide ion-OH = 6.0 mg/l of CO32-carbonate ion = 12.2 mg/l of hydrogen ion / bicarbonate HCO3- Total alkalinity total alkalinity is used to measure the hydroxides; carbonates and bicarbonates contents in water it is expressed in french degree (° f). By adding the sampled water with an acid, we obtain a primary value that represents the alkalinity corresponding to a pH of 8.2 (phenolphthalein turn). At this point all the hydroxides and carbonates are neutralized; continuing the acid dosage up to pH 4.4 we led to a second point of neutralization (curve of methyl orange). It will then allow knowing all of initially presence of hydroxides, carbonates and bicarbonates. Total hardness TH Expresses the permanent hardness of water, it is also an indicator of mineralization in water. It is mainly due to calcium and magnesium ions contents. The hardness is expressed as ppm CaCO3 or in French degree: ° f (Not to be confused with the symbol ° F, degree Fahrenheit). 1 french degree corresponds to: - 4.0 milligrams of calcium per litter of water - 2.4 milligrams of magnesium per litter of water. Sludge Volume Index It measures the ability of a concentrated sludge

of 1g/l to settle, the ability to separate from liquid

phase under the action of gravidity.




7. ELECTRICAL POWER PLANT SUPPLY

7.1. Power supply 1 and electrical network

(Refer to the VPKOO1 ACT OO ELEC FAL 207 D FUNCTIONNAL ANALYSES)

Electrical hazards

Works inducing electrical hazards must be performed by skilled personnel. The wearing of personal protective equipment is mandatory:

The electric consignment is essential before any work on the equipment. When first starting the cabinet is off and it is necessary to supply and switch on all breakers. This requires opening the cabinet and must be performed by authorized personnel.

7.1.1. Electrical network architecture

7.1.2. Installed power

Nominal power supply installed 1000KVA Neutral arrangement NTC Power voltage 400VAC Secondary power voltage 230VAC Control command & signalisation power voltage 24VDC




7.1.3. Cabinets locations

(See characteristics of equipments pages 11 & 20 to 26 of this document) The WTP comprising five (5) main buildings including its own electrical cabinet, and each of them is dedicated to a specific phase of treatment as follow:

o Main switch board & all the buildings cabinets supplied by MSB o Raw water building supplied by MCC1 o Clarifiers & Filter building supplied by MCC2 o Reagent & chlorine building supplied by MCC3 o Sludge recovery tanks MCC4

.

7.1.4. Area’s emergency stops

Note: When switched ON the emergency stop button stops all electromechanical equipment in area Once the button is switched OFF SCADA must be acknowledged by pressing the "RESET" button in front door of each cabinet. Warning! After reset all electromechanical equipment in auto mode can start up again at any time.

7.2. Generator - power supply source 2

(Supplier: PRAMAC – model: GSW1120M – 2014MC194) One Generator - 400 V – 1013 KVA is connected to the MSB source inverter

Automatic Start when Main powers supply trips

Automatic Stop when Main power supply re-established Electrical and mechanical characteristics An alternator (MECCALTE ECO 43 1L) coupled to a (MTU 16V2000 G65) diesel engine

PRP-Prime power 1013.00KVA 810.00KWe

LTP-Limited time power 1115.00KVA 892.00KWe

Nominal voltage 400V - 3x1 phases + neutral

Power factor 0.8

Maximum current power 1611.00A

Nominal rotating speed 1500rpm

Cooling type water

Aspiration turbo

Fuel consumption at 100% of PRP 197L/h (specific consumption: 198g/KWh) at 75% of PRP 149L/h at 50% of PRP --------

Battery starter voltage 24V – 2 batteries 12V 220Ah

Manual oil drain pump

Automatic fuel tank transfer pump 230VAC – 58 L/mn




Fuel tank (Supplier: CHAPLAIN SAS – model: HEMERY DP) The Generator is linked to a 10 000L fuel tank providing 60hrs of autonomy at 75% RPR load. Fuel tank characteristics

Fuel tank double wall with detector ok leak

Full capacity 10 000L

Metallic cradle

Limiter of filling

Tube of inhalation

Symmetric join

event

Leak detector (Supplier: Self Climate – model LAG 2000)

Fuel level transmitter (Supplier: INTERMESURES– model: JE 1002S)

7.3. Power balance

(Refer to the VPKOO1 ACT OO ELEC FAL 207 D FUNCTIONNAL ANALYSES) (Refer to the VPK001-ACT-00-ELEC-CAL-203-B_Power balance)

7.4. 230VAC Uninteruptible Power Supply

UPS electrical characteristics

UPS (Supplier: EATON)

reference Drawing ref

qty Power W

VAC In/out

Hz Amp out

Battery installed

Ah

EX 2200 RT MSB 1 1980 230 50/60 9.6 6x12V 7 9SX 5000I RT3U MCC2 1 4500 230 50/60 21 EX 1000 MCC1/3/4 3 900 230 50/60 4.3 3x12V 7 Card-MS MDCC relay 5

UPS functioning description

UPS are installed in each main five (5) cabinets in order to temporary maintain the electrical cabinets control circuits command, instrumentation and SCADA system under 230VAC voltage when the city supply power fails and till the generator automatically start. This allows all the cabinets general circuit breakers do not trips and so allow operation’s to restart the WPT production from PLC supervision without general resetting when supply power is recovered. For this to be efficient, all the UPS internal cabinet xxQ2 commutation switches must sets in position 1. Three (3) positions are available: 1= UPS 1+2= UPS + NORMAL in parallel 2= BY-PASS UPS UPS capacity / working time: UPS are designed to maintain voltage power on SCADA control command

during 0.5 up to 1 hour.




8. WTP OPERATION INSTRUCTIONS

The WTP operations management as well as operations works should be performed by trained and experienced staff, which carefully read and understood these instructions. VINCI is not responsible for the possible consequences of non-compliance with instructions in this manual.

8.1. Daily operations

The following operations must be performed daily and recorded in the logbook;

Remaining levels, volumes and also the density of the chemical reagents solutions

Always prepare 1 stand-by tank of new chemical solution ready to be used

Number of daily filter’s backwashing

checks and maintenance of the online water quality analyzers

Recording of daily WTP operating parameters…; - Water in/out flow rates and volumes - Water and sludge tanks levels - Pumps discharge working pressures - Water dilutions flow rates and adjustments - Control of the day before consumed reagents - Control of the free chlorine in water concentration in CL2 dosing room - Check motive water flow rate is well adjusted at less 5m3/h up to 6m3/h - Check vacuum pressure indicated on the cylinders change-over - Check the Cl2 dosing flow rate in kg/h - Control of the free chlorine in water concentration in treated water - Working times counters of each running equipments - Motor gear boxes oil levels and grease - Automatic screen water level differential - Rejected wastes quantity in auto-screen skip - Checks on sludge drying beds levels and sludge volume in dehydration - Sample dehydrated sludge for the dried percentage test - Check vacuum pressure gauges on every filter - Check pH & NTU of raw water - Check pH of flocculation - Check pH & NTU of clarified water - Check adjusted flow rates of the dosing pumps - Counting of stored chemical reagents bags - Check all the electromagnetic flow meter water volume totalizes - Visual aspect of clarified water above lamellar plates - Visual aspect of clarified water aspect on sand filters - Compressed air pressure - Air leakage or sludge leakage on clarifiers and ST’S sludge extraction valves - Water service booster pressure - Motive water pressure

Attentive checks on plant water leakages or whatever anomaly

Sampling water & sludge for the lab daily water and sludge analyses (pH; NTU, Cl2 etc…)

Cleaning of the plant….




8.2. Operations logbook & WTP adjustments

For proper WTP production the following operations must be daily planned and realized,

Fill and keep update the operation’s logbook

Ensure the filling of chemical tanks solutions

Check that washing the filters is regularly performed

Check that routine maintenance operations are regularly performed

In addition, check weekly chemical parameters with laboratory performed tests. All the parameters of the station's history registered by SCADA can be viewed at CURVES page of the control panel. It is also possible to view the running time of the motors of equipment and valves. All maintenance and incidents must be recorded in the logbook. The clarifiers sludge extraction’s setting is made to obtain the best concentration of the sludge without clogging up the unit. Extraction Time ON should not be too large: 10 to 20 seconds are sufficient. It is repeated every 10 to 60 minutes, depending on Flow rate, NTU & MES of raw water. In case of strong turbidity, the time between two extractions is automatically adjusted but the operator will control that time do not be less than 5 minutes so as not to disrupt the clarifier functioning. At the contrary too spaced extractions may clog the unit.

8.3. Select 1 + 2 Lines of treatment

Before starting the WTP water treatment and production it is imperative to check that the valves are in the correct position and to visually inspect all equipment is in good condition. The unit is divided into 2 lines of treatment (for 10 MGD) with a possible extension at 3 lines (15 MGD). The water treatment plant is designed to work with two identical lines in parallel. For maintenance or operating reason’s, on GD, in automatic mode, the operator can stop one of the two lines (possible future extension at 3 lines) in production In that case, all the dedicated equipments’ of the stopped line are automatically stopped by PLC Associated equipments are step by step: hereafter described: Coagulation, flocculation, lamellar clarifiers, and chemicals injections and dilutions As well as the sludge extraction of corresponding lamellar clarifiers




8.4. Start / stop the plant

8.4.1. Standard start up procedure

The SCADA requires a standard start up procedure of Initial conditions for starting the plant production on 1 line or 2 lines

No 400V fault

No general emergency stop

No defect of 230V

No defect of 24V and no WAGO communication fault

No PLC Security communication fault.

No High level (LSH) detector (CP-LSH-001) in the collection pit.

No very low level (LSL) in the raw water tank (RW-LSL-001)

No very low level in the treated water tank (AC-LT-001 – US Level SPLSL) or (AC-LSL-001)

At least seven filters available.

No switch in manual mode for the following workshops: Pre-treatment, Coagulation, Flocculation, Lamellar Clarifiers, Backwash, Aluminium sulphate, Polymer, Lime and chlorination.

No emergency stop at the following workshops: Pre-treatment, Coagulation, Flocculation and Lamellar Clarifiers

Aluminium sulphate workshop available [= At least one pump available and no emergency stop] and Remote control of the injection “On-line” or Remote control “Off-line”

Polymer workshop available [= At least one pump available and no emergency stop] and Remote control of the injection “On-line” or Remote control “Off-line”

Lime workshop available [= At least one pump available and no emergency stop] and Remote control of the injection “On-line» or Remote control “Off-line”

Chlorination workshop available [= At least one water booster pump available and one Chlorine cylinder not empty]

Compressed Air workshop available (No low pressure HF-PSL-0012)

The PLC will consider the plant in production when Raw water flow rate is (CB-FIT-101) over 100 m3/h (threshold adjustable parameter)

These start-up conditions activate the equipments of the following workshops;

Chlorination service water

Chlorination injection

Aluminium sulphate workshop,

Polymer injection

Lime injection

Coagulation

Flocculation

Clarification

Filtration




8.4.2. Automatic start

This mode is recommended as it is the current operation mode of the station The water plant turns on automatically when a threshold level in the treated water tank is reached and stops when the high level is reached or the pressure at the discharge of treated water pumps reaches 3.0 barg; Withdrawing of treated water from treated water tank is enslaved to the water level. The treated water pumps stop when the low level in the tank is reached and restart at medium level The water production is controlled by a minimum flow rate set: Reagent dosing pumps are enslaved to the raw water minimum flow rate This means that they start when the raw water starts and will stop when it stops. The chlorine injection A lack of chlorine gas (simultaneous low level in the two cylinders) or a fault leads to an automatic shutdown of the plant and generates an alarm. The mixers of the lime milk solution’s tanks running continuously. The mixers of aluminium sulphate solution’s tanks are not required continuously A mixing time of 60 minutes will be enough to obtain a good dilution and thorough mixing. Low levels security in the reagents tanks prevent the functioning without water of mixers and dosing pumps. The sludge extraction from the decanters is automated by a time OFF time ON adjustable timers monitoring the electric and pneumatic valves. The filters loss of charge control is performed by the pressure drop measuring gauges installed at the output of the filters. When the pressure drop reaches 2.5 mWC, filters shall be automatically and successively washed following the SCADA washing program

8.4.3. Automatic stop

STANDARD SHUT DOWN PROCEDURE The conditions to run the plant will no longer be valid for the PLC for the (Line 1 or Line 2 or 2 lines) if;

400V fault

General emergency stop

230V fault

24V fault or WAGO communication fault with emergency back-up

Filtered water tank in line & High level detected (AC-LSH-001)

Backwash water tank in line & High level detected (HO-LSH-001)

Any switch on MANUAL position for a workshop (after a time of 15 sec.)

Any switch on MANUAL position for a workshop (after a time of 15 sec.)

Fault on chlorination in order do not send no disinfected water in the treated water tank.

High level in collection pit

High level in the treated water tank (AC-LT-001 – US Level SPLSH) or (AC-LSH-001).




The loss of one of the above permanent condition will lead to shut down the following equipment/workshops

Chlorination service water Chlorination injection Aluminium sulphate workshop, Polymer injection Lime injection Coagulation Flocculation Clarification Filters During a prolonged stopping of production, longer than one week, it is necessary to do the following operations: - Emptying and cleaning of the raw water tank - Emptying and cleaning of the decanters, particularly the sludge settling compartment, to prevent the sludge fermentation and filling decanters with raw water without coagulant as well as flocculent. - The mixing of the lime milk must be maintained otherwise it will be emptied. This product decanting easily, flush the pipes and dosing pumps injection’s circuits using service water. - Polymer solution cannot be conserved longer than one week. It must be drained as well - Wash the filters - Emptying and cleaning of the recovery tanks and sludge settling tanks -

When restart, it will be necessary to wash the filters and to check the filtration’s parameters and to perform up the sanitary water analyses

8.4.4. Manual mode

This mode is mainly reserved for maintenance operations and is used to start equipment individually. This mode is totally managed by the operations team’s lead and under its responsibility.




CAUSES – EFFECTS CHART EFFECT CAUSES

WATER PUMPING STATIONS CTL- COMMAND RAW WATER CW

FWT TREATED WATER CP

PLC

R

EMO

TE C

ON

TRO

L

PLC

A

UTO

M

OD

E

MA

UA

L

LOC

AL

MO

DE

PLC

T

IME

ON

/ O

FF

PR

OX

IMIY

SWIT

CH

EMER

GN

CY

S

TOP

RW

-LT

-00

1

SP

-DIF

F-LS

H

RW

-LT

-00

1

SP

-DIF

F-LS

L

RW

-LT

-00

2

RW

-LSL

-00

1

RW

-LSH

-00

1

CB

-FIT

-10

1

SP

-FSL

L <

10

0

CB

-FIT

-00

1

SP

-FSL

p1

< 8

00

CB

-FIT

-00

1

SP

-FSL

.p2

<1

80

0

CE-

LSH

-00

1

HO

-LT

-00

1

HO

-LSL

-00

1

HO

-LSH

-00

1

HO

-PSH

-00

1

HO

-FSL

-00

2

< 5

.0m

3/h

HO

-LSL

-00

2

AC

-LT

-00

1

SP

-LSL

AC

-LT

-00

1

SP

-LSL

p1

AC

-LT

-00

1

SP

-LSL

p2

AC

-LT

-00

1

SP

-LSH

AC

-LSL

-00

1

AC

-LSH

-00

1

AC

-PIT

-00

1

SP

-PSL

AC

-PIT

-00

1

SP

-PSH

AC

-FIT

-00

1

SP

-FSL

L

AC

-FIT

-00

1

SP

-FSL

.P1

< 8

00

AC

-FIT

-00

1

SP

-FSL

.P2

< 1

80

0

CP

-LT

-00

1

S

P-L

SL

CP

-LT

-00

1

S

P-L

SH

CP

-LSL

-00

1

CP

-LSH

-00

1

GL-

WE-

00

1/2

e

mp

ty

RW-SF-001 Auto screen START – STOP X X X X-X X X X

RW-PC-001 RW pump START – STOP X X X X X X * X X X X

RW-PC-002 START – STOP X X X X X * X X X X X

RW-PC-003 START – STOP X X X X X * * X X X X

HD-PC-001 SWB pump START – STOP X X X X X X

HD-PC-002 START – STOP X X X X X X

HD-PC-003 SW pump START – STOP X X X X X X X

HD-PC-004 START – STOP X X X X X X X

HO-PC-001 BKW pump START – STOP X X X X X X X

HO-PC-002 START – STOP X X X X X X X

HO-PC-003 START – STOP X X X X X X X

HO-PC-004 MW pump START – STOP X X X X X X X X

HO-PC-005 START – STOP X X X X X X X X

TW-PC-001 TW pump START – STOP X X X X X X * X X X X *

TW-PC-002 START – STOP X X X X X * X X X X * X

TW-PC-003 START – STOP X X X X X * * X X X * *

HE-PC-001 Sump pump START – STOP X X X

CP-PC-001 CP pump START – STOP X X X X X

CP-PC-002 START - STOP X X X X X X

*- Due to the automatic permutation starting & stopping conditions can act to each pump





SLUDGE PROCESS & PUMPING STATIONS CTL- COMMAND RECOVERY TANKS SP WP CP

PLC

R

EMO

TE C

ON

TRO

L

PLC

A

UTO

M

OD

E

MA

UA

L

LOC

AL

MO

DE

PLC

T

IME

ON

/ O

FF

PR

OX

IMIY

SWIT

CH

EMER

GN

CY

S

TOP

CB

-LSL

L-1

00

CB

-LSL

-10

0

CB

-LSH

-10

0

CB

-LSL

L-2

00

CB

-LSL

-20

0

CB

-LSH

-20

0

CB

-LSL

L-3

00

CB

-LSL

-30

0

CB

-LSH

-30

0

EB-P

C-1

00

ST

OP

EB-P

C-1

01

ST

OP

EB-P

C-2

00

ST

OP

EB-P

C-2

01

ST

OP

EB-P

C-3

00

ST

OP

EB-P

C-3

01

ST

OP

ED-L

SL-1

01

ED-L

SH-1

01

ED-L

SL-1

02

ED-L

SH-1

02

CB

-FIT

-10

0

CP

-LSL

-00

1

CP

-LSH

-00

1

CB

-FIT

-10

1

SP

-FSL

L <

10

0

CB

-AIT

-10

1

RW

NTU

GL-

WE-

00

1/2

e

mp

ty

ED-PC-100 Sludge pump START – STOP X X X X X X X X

ED-PC-101 START – STOP X X X X X X X X

ED-PC-102 Supernatant pump START – STOP X X X X X X X X

ED-PC-103 START – STOP X X X X X X X X

EB-AA-100 RT mixer START – STOP X X X X X X

EB-AA-200 START – STOP X X X X X X

EB-AA-300 START – STOP X X X X X X

EB-PC-100 RT PUMP START – STOP X X X X X X X X X

EB-PC-101 START – STOP X X X X X X X X X





CD-VA-100 to 105 Sludge extraction clarifier 1 OPEN - CLOSE X X X X-X X X X X K

CD-VA-200 to 205 Sludge extraction clarifier 2 OPEN – CLOSE X X X X-X X X X X K



ED-VA-100 to 160 Sludge extraction ST1 OPEN – CLOSE X X X X-X X X X X

ED-VA-200 to 260 Sludge extraction ST2 OPEN – CLOSE X X X X-X X X X X

ED-VA-300 to 360 Sludge extraction ST3 OPEN - CLOSE X X X X-X X X X X

*- Due to the automatic permutation starting & stopping conditions can act to each pump





CHEMICAL PROCESS & PUMPING STATIONS CTL- COMMAND ALUMINIUM TANKS LIME MILK TANKS POLYMER CP

PLC

R

EMO

TE C

ON

TRO

L

PLC

A

UTO

M

OD

E

MA

UA

L

LOC

AL

MO

DE

PLC

T

IME

ON

/ O

FF

PR

OX

IMIY

SWIT

CH

EMER

GN

CY

S

TOP

GB

-LSL

-10

1

GB

-LSH

-10

1

GB

-LSH

H-1

01

GB

-LSL

-20

1

GB

-LSH

-20

1

GB

-LSH

H-2

01

GR

-LSL

-10

1

GR

-LSH

-10

1

GR

-LSH

H-1

01

GR

-LSL

-20

1

GR

-LSH

-20

1

GR

-LSH

H-2

01

GE-

LSL-

00

1

GE-

LSH

-00

1

GE-

LSH

H-0

01

CC

-AIT

-10

0

ph

co

ag 1

CC

-AIT

-30

0

pH

co

ag 2

CD

-AIT

-10

1

pH

CW

CP

-LSL

-00

1

CP

-LSH

-00

1

CB

-FIT

-10

1

SP

-FSL

L <

10

0

GL-

WE-

00

1/2

e

mp

ty

CB-AA-100 Coag mixer file 1 START – STOP X X X X X

CB-AA-300 Coag mixer file 2 START – STOP X X X X X

CC-AA-100 Flock mixer file 1 START – STOP X X X X X

CC-AA-300 Flock mixer file 2 START – STOP X X X X X

GR-AA-100 Lime mixer tank 1 START – STOP X X X X X X

GR-AA-200 Lime mixer tank 2 START – STOP X X X X X X

GB-AA-100 Al2 mixer tank 1 START – STOP X X X X-X X X X

GB-AA-200 Al2 mixer tank 2 START – STOP X X X X-X X X X

GR-PC-001 Lime milk pump START – STOP X X X X X X

GR-PC-002 START – STOP X X X X X X

GB-PV-100 Al2 dosing pump START – STOP X X X X X X

GB-PV-200 START – STOP X X X X X X

GE-PV-001 Polymer to coag 1&2 START – STOP X X X X X X

GE-PV-002 START – STOP X X X X X X

GH-PV-001 Polymer to ST1 START – STOP X X X X X X



GH-PV-004 Polymer spare START – STOP X X X X X X

HD-VA-002 Water dilution to Flock 1 OPEN - CLOSE X X X X

HD-VA-003 Water dilution to Flock 2 OPEN – CLOSE X X X X

HD-VA-004 Water dilution to ST1 OPEN – CLOSE X X X X



GR-vA-001 Lime injection to inlet FI OPEN – CLOSE X X X X

GR-vA-002 Lime injection to outlet FI OPEN – CLOSE X X X X

GR-vA-003 Lime injection to Flock 2 OPEN – CLOSE X X X X

GR-vA-004 Lime injection to Flock 1 OPEN - CLOSE





CHLORINE PROCESS CTL- COMMAND CL2 PROCESS CONTROL CP

PLC

R

EMO

TE C

ON

TRO

L

PLC

A

UTO

M

OD

E

MA

UA

L

LOC

AL

MO

DE

PLC

T

IME

ON

/ O

FF

PR

OX

IMIY

SWIT

CH

EMER

GN

CY

ST

OP

GL-

II-0

02

C

l2 S

P <

2.0

mg/

l

GL-

II-0

02

C

l2 S

P >

3.0

mg/

l

HO

-FSL

-00

2

< 5

.0m

3/h

GL-

II-0

01

S

P 1

> 2

.0p

pm

GL-

II-0

01

S

P 2

> 4

.0p

pm

GL-

II-0

03

S

P 1

> 2

.0p

pm

GL-

II-0

03

S

P 2

> 4

.0p

pm

CP

-LSL

-00

1

CP

-LSH

-001

CB

-FIT

-10

1

SP

-FSL

L <

10

0

GL-

WE-

001

/2

em

pty

GB-CN-001 Air fan RE building START - STOP X X X X X

GB-CN-002 START – STOP X X X X-X X X

GL-CN-001 Air fan Neutral room START – STOP X X X X-X X X X X

GL-CN-002 Air fan dosing room START – STOP X X X X-X X X X X X X

GL-CN-003 Air fan Cl2 storage START – STOP X X X X-X X X X X X X

GL-CN-004 START – STOP X X X X-X X X X X X X

GL-CN-005 Cl2 gas fan extract START – STOP X X X X X X X

GL-PC-001 NaOH pump neutral START – STOP X X X X X X X

GL-VA-001 Cl2 drums file 1 isolation OPEN – CLOSE X X X X

GL-VA-002 Cl2 drums file 2 isolation OPEN – CLOSE X X X X

GL-VA-006 Cl2 drums file 1 on duty OPEN – CLOSE X X

GL-VA-007 Cl2 drums file 2 on duty OPEN – CLOSE X X

GL-VA-008 Cl2 dosing valve OPEN - CLOSE X X X X

GL-HA-003 Electrical heater belt evaporator file1 START – STOP X X

GL-HA-006 Electrical heater belt evaporator file2 START – STOP X X

HO-EV-001 Motive water valve OPEN - CLOSE X X X X

HO-PC-004/5 Motive water pumps START – STOP X X X X X X

GL-UK-001/2 Horn tower alarm START – STOP X X X

GL-UG-001/2 Lighting tower alarm START – STOP X X X X X





PROCESS UTILTIES CTL- COMMAND BCKW HF HE CP

PLC

R

EMO

TE C

ON

TRO

L

PLC

A

UTO

M

OD

E

MA

UA

L

LOC

AL

MO

DE

PLC

T

IME

ON

/ O

FF

PR

OX

IMIY

SWIT

CH

EMER

GN

CY

ST

OP

CE-

VA

-10

3 t

o 8

03

CP

-LSL

-00

1

CP

-LSH

-001

CB

-FIT

-10

1

SP

-FSL

L <

10

0

GL-

WE-

001

/2

em

pty

HE-CA-001 Air blower START - STOP X X X X X X X X

HE-CA-002 START – STOP X X X X X X X X

HF-CC-001 Air compressor START - STOP X X X X X

HF-CC-002 START - STOP X X X X X

HF-VA-004 Comp Air drain valve START - STOP X X X X-X X X

HF-ZP-002 Comp Air dryer START – STOP X X X X X

RW-CN-00 Air fan RW pumping START – STOP X X X X-X X X

CE-CN-001 Air fan FI gallery START – STOP X X X X-X X X

HE-CN-001 Air fan blower room START – STOP X X X X-X X X

TW-CN-001 Air fan TW pumping START - STOP X X X X-X X X




9. CONTROL COMMAND FROM PLC SUPERVISION

9.1. Automatic screen monitoring

9.2. Raw water pumping monitoring

9.3. Coagulation – flocculation - clarification monitoring

9.4. Filtration and washing monitoring

9.5. Filtered water pumping monitoring

9.6. Treated water distribution monitoring

9.7. Collection pit monitoring

9.8. Coagulation chemical treatment monitoring

9.9. Polymer chemical treatment monitoring

9.10. Lime chemical treatment monitoring

9.11. Disinfection chemical treatment monitoring

9.12. Chlorine gas neutralization monitoring

9.13. Clarifier sludge sequences of extraction monitoring

9.14. Settling tanks sludge sequences of extraction monitoring

9.15. Drying bed filling and emptying monitoring




10. WTP MAINTENANCE INSTRUCTIONS This is a synthesis of the instructions of the installed supplier’s equipments. It could not be a

substitute of the supplier’s instructions. Furthermore any maintenance or replacement of parts must

be validated by the technical specifications of the suppliers. Prior to any intervention on electro-

mechanical equipment, circuit breaker must be switched OFF and recorded in the logbook. Every

maintenance operation must be recorded in the logbook tracking.

Existing hazards and safety procedures

The wearing of personal protective equipment is required to perform maintenance on WTP. Note: wearing the harness is required when there is risk of falling, particularly for the maintenance of ducts and tanks. Whenever there is presence of raw water, the H2S sensor must be worn for maintenance. Respect for logging procedures on-site is also mandatory.

.

Mechanical hazards To avoid the risk of mechanical, during the commissioning phase, operation and maintenance, wearing personal protective equipment is mandatory.

Fall and drowning hazards Working on a WTP presents a risk of drowning in case of reckless behaviour; it is strictly forbidden to climb over man railings. Operation and maintenance workers must be experienced and be aware on the risk corresponding to their activities.

Chemical hazards Handling chemical reagents presents burn hazard to the operator. ACCORDING TO THE PRESENT RISKS the port of the PPI (Personal protective equipment) is mandatory for any operation on chemicals.

Electrical hazards

In case of faults or any intervention, always refer to the vendor instructions. Electrical circuit breakers logging must always be carried out before any maintenance on electrical equipments.




10.1. Automatic screening

An automatic bar screen is a machine for holding bulky materials and waste of all types carried by raw water. Wastes are retained by a grid and automatically cleaned by a bucket that collects the solids and discharges them directly into a hopper. This allows optimum screening in all circumstances, with low or high flow rates. Maintenance works consist to remove the wastes and to keep clean the workshop

10.2. Tanks and Mixers

Regularly check that the noise and vibration levels are "normal", and that the electrical parameters (voltage, current and possible isolation of windings) are constant. Clean and check the mixer’s propellers. Empty and clean the tanks periodically. The operator will ensure that tanks are kept clean and in good conditions Tanks operations Frequency

Raw water tank First month Empty and cleaning

Raw water tank 6 months Empty and cleaning

Recovery tanks First month Empty and cleaning

Recovery tanks 6 months Empty and cleaning

Settling tanks First month Empty and cleaning

Settling tanks 6 months Empty and cleaning

Sludge pit monthly Empty and cleaning

Supernatant pit 6 months Empty and cleaning

Filtered water tank 6 months Empty and cleaning

Disinfection tank First month Empty and cleaning

Disinfection tank yearly Empty and cleaning

Treated water tank First month Empty and cleaning

Treated water tank yearly Empty and cleaning

Aluminium sulphate tanks 6 months Empty and cleaning

Lime milk tanks 2 weeks Empty and cleaning

10.2.1. Lime milk tanks

Complete emptying of the tanks 1 time per month. Clean tanks and pipe circuits Lime milk injection The lime milk injection circuit must be regularly flushed with service water (1 time a day) and more again after any prolonged shutdown of the lime milk pumps

10.3. Lamellar clarifier

Lamellar plate: Periodically check the lamellar modules (one per month) and clean them if necessary, using a jet after lowering the water level. Warning: Use low pressure water and Provide a hose DN25 approximately (3-6 m3 / h). Adjust the power of the water jet to avoid damaging the modules, water temperature below 60 ° C, do not use solvents. Clarifiers tanks: Empty and clean the clarifier periodically (every six months). The operator shall ensure that special interior and exterior paints are kept in good condition




10.4. Filters

The maintenance operations consist of: Replacement of the seals of defective valves, Checking the status of gauges and replace if necessary After washing, during normal restart filters, verify that the initial pressure drop (with clean sand) is reached again. A pressure drop increase is indicative of insufficient washing. In this case, check the water and air flow rates; if correct lengthen the air blower + water washing sequences. Once a year, check the height and condition of the sand bed; the presence of a hole or a dent may be caused by a faulty nozzle. Filter bottom check procedure once a year: Drain the filter by opening the drain valve and open the access hatch. In accordance with safety procedures (particularly those applying in confined spaces), check the approximate amount of materials present under the floor and put aside all the collected materials. Using a water jet clean the filter bottom until the complete elimination of any trace of materials. Note: An excessive volume of material is synonymous broken nozzle. Remove sand and replace it. During a log stop of the filtration, we can make a filter draining, if we want to remove the sand for example. However, it is imperative that the filter remains full of water during a stop (short or long) to avoid the formation of a plug of mud very difficult to remove during a restart.

10.5. Pumps – air blower - compressor

Pump: Operating pressure of water pumps must never be less than 0.5 barg to avoid a risk of cavitations. The pressure can be read on the gauge and no air must inlet in suction pipe. Regularly check that the noise and vibration level of the pumps are "normal" and that the electrical parameters (voltage, current and possible isolation of windings) are constant. Control the mechanical seals. It should not be any leaks. Excessive vibrations and noises level is often due to a defective bearing; replace if necessary. Always refer to the vendor instructions before any intervention. Dosing pumps: Regularly check that the noise and vibration levels are "normal" and that the electrical parameters (voltage, current and possible isolation of windings) are constant. Every 3 months: Clean foot valve and valve boxes Cleaning the injection pipe Every 6 months: Control of the dosing flow rate at 100%, 75%, 50% and 25% and verify that the rates are corresponding to the characteristics of the pump. Every year: Preventive maintenance recommends the following change wearing parts: if necessary change the membrane and seals damaged Always refer to the vendor instructions before any intervention. Air compressor: Grease the motor bearings every 1000 working hours or every 2 years . Always refer to the vendor instructions before any intervention.




Air blower: More frequent maintenance may be required if the blower is operated continuously at the extremes of its performances or environment limits. If necessary adjust the maintenance plan according to your experience. Air blower operations Frequency Refer to the supplier section

Check the belt tension First 30mn

Check conditions of the belts First 24h

Check oil levels weekly

Check inlet filter is not blocked weekly

Drain and replace the pump oil First 200h – 2 weeks

Check conditions and tension of drive belts 1000h – 6 weeks

Check the enclosure air vents are not blocked 1000h – 6 weeks

Test the pressure relief valve 1000h – 6 weeks

If discharge temp > 120°C drain & replace blower oil 4000h – 6 months

Grease the drive belt tension rod 8000h - yearly

Check the drive pulleys for wear 8000h - yearly

Drain & replace the blower oil 8000h – yearly

Replace the filter cartridges yearly

Inspect the non return valve yearly

Replace drive belts yearly

Inspect acoustic foam yearly

Replace pump bearings and seals and gaskets 3 years

Always refer to the vendor instructions before any intervention. Pumps operations Frequency Refer to the supplier section

Greasing of bearing 2-6 months

Coupling lubrication 3 months

Vibrating inspection 3 months

Mechanical seal – braided inspection weekly

Always refer to the vendor instructions before any intervention.

10.6. Chlorine

Control of access to chlorine building All chlorination facilities shall be kept locked unless personnel are located within the facility. The Responsible Manager shall ensure than no person shall enter a chlorination facility without an Authorized operator or Person for that facility first ensuring a safe working environment exists within the chlorination facility. The Responsible Manager shall ensure only trained and competent personnel carry out work in the chlorination facility which affect the disinfection process or involves the chlorination equipment. In addition, the authorized operator shall ensure that no untrained personnel are present in the chlorination facility when work is being carried out which will, or may, result in the release of chlorine gas. The Responsible Manager shall ensure a suitable induction process is in place for people entering a chlorination plant who do not have experience with chlorination facilities and/or who are not personally known to site staff (first entry for that site). The objective of this induction process is to ensure those entering are made aware of:

The potential danger of chlorine gas

The importance of not affecting the disinfection process.

The need to exit the facility immediately and raise the alarm should a chlorine leak occur.




In case of alarm mind to check the direction of the wind and to be in opposite direction Other specific issues considered necessary for inclusion, depending of the purpose for which entry is being granted Management should be designed to correspond to potential risks associated with a specific site and may be as simple as people reading a half page induction statement and then signing and dating a register or work permit. Those people intending to carry out maintenance work may require additional induction material covering issues such as work permits, physical layout of the facility and operating restrictions. The following requirements apply to personnel doors to any room in which chlorine is kept and which are within 15m of the chlorine containers, evaporators and chlorinators. Any hinged doors shall open outwards and be fitted with devices that can keep the door open when required. The door shall be kept open whenever personnel are inside. A sign indicating this requirement shall be placed outside the door, in such a position that it remains visible whether the door is open or closed.

10.7. Polymer preparation

10.8. Drying beds




10.9. Instrumentation

INSTRUMENT REFERENCE Periodicity MAINTENANCE WORKS DESCRIPTION Advices

Floating switch LSL or LSLL

level

Weekly Check the minimum water level required for stopping pumps & mixers

-50cm above pump suction point -30cm above mixer propeller

Floating switch LSH level Check the water level required for starting pumps & mixers

See page 20 to 26 of this document

Floating switch LSHH level Check the maximum water level allowed below the overflow elevation and/or the WTP standard start-up condition


All the floaters Check floaters are clean and that it’s up/down translation is free

Removes the blocking materials from floaters and from tank


US transmitter LSL threshold Weekly Check the minimum water level required for stopping pumps & mixers

-50cm above pump suction point -30cm above mixer propeller

US transmitter LSH threshold Check the water level required for starting pumps & mixers


US transmitter LSHH

threshold

Check the maximum water level allowed below the overflow elevation and/or the WTP standard start-up condition


All the US probes monthly Check US probes are clean Verify there is no gap between read level and true water level


PH analyzer weekly Get probe carefully out from water without remove it from suspension support and check it is clean

Clean the probe’s head with clear water and using soft tissue or sponge or paper towel

Check if ph value changing before and after probe cleaning

Reduces time between 2 cleanings

If ph value before/after cleaning not changing

Increases time between 2 cleanings

Check water pH value is 6.0 to 8.5 If not; performs a 2 points calibration

yearly pH probe replacement following the

E&H recommendation

Every 6 months or every year





Turbidity analyzer weekly Get probe carefully out from water without remove it from suspension support and check it is clean

Clean the probe’s head with clear water and using soft tissue or sponge or paper towel

Check if NTU value changing before and after probe cleaning

Reduces time between 2 cleanings

If NTU value before/after cleaning not changing

Increases time between 2 cleanings

Check water NTU value Mini 150 – Maxi 686

NTU probe replacement following

the E&H recommendation


Chlorine analyzer weekly

Cl2 probe replacement following the

Prominent recommendation

10.10. Electrical cabinets

Regular maintenance of electrical cabinets mainly is dusting with appropriate equipment. Dust can damage some electronic components and limit the aeration of electrical equipment. Once a year, it is recommended to check the tightness of all electrical connections. A poor tightening can lead to false contacts and even an overheating of connections can damage the material. If necessary, replace the electrical components failing. Any operation requiring the opening of the electrical cabinet must be carried out by authorized and skilled workers




11. TROUBLE SHOOTING CHART

11.1. Bad clarification

CAUSES REMED

Clarified water turbidity > 10 NTU

Check the RW turbidity (230 <NTU<600)

Check pH of flocculation (6.5 to 7.5)

Check aluminium sulphate dosing rate

Check polymer dosing rate

Check lime of milk dosing rate

Check sludge extraction adjustments

Sludge from bottom rise to surface Proceed to a manual sludge extraction

Proceed to a new sludge extraction setting

11.2. Short filtration cycles

CAUSES REMED

TSS concentration too high in clarified water Check the RW turbidity (230 <NTU<600)

Check pH of flocculation (6.5 to 7.5)

Perform a new jar test trial on RW

Check sludge extraction adjustments

Confirm polymer injection dosing rate

Bad washing of filters Check filtration backwash cycles adjustment

Proceed to 1 or several extra filter backwash

11.3. Loss of sand medium

CAUSES REMED

Filter floor nozzle damaged Observe the sand medium surface; if you can see a hole in sand… that means 1 or several nozzles are damaged

Remove sand from filter

Check floor and change damaged nozzles

Perform an air blowing test

Refill sand into filter

Perform an extra backwash

Final check and reinstate filter in production




11.4. Filtered water bad quality CAUSES REMED

11.5. Excessive volume of sludge CAUSES REMED

11.6. Air service alarm

11.7. Cl2 gas alarm

11.8. WTP production shut down

11.9.

11.10.

11.11. List of alarms

All of the incidents generating an alarm are registered by SCADA and are viewable on the PLC screen.




12. JAR TEST

12.1. Jar test trial purpose

As basic as the jar test may be, it remains one of the best methods of assessing and optimizing the various processes and options available for treatment of potable and other types of water. Properly done, it can provide a great deal of information during all phases of a treatment system's development - initial process screening and development, equipment sizing, operational optimization, and evaluation of potential alternative treatment methodologies. All this can be achieved at relatively little cost, and without the need for a great deal of high-tech knowledge and expertise.

12.1.1. Jar test trials using chemical solutions

Before performing the JAR TESTS we prepare solutions at different concentrations using the commercial chemical reagents stocked in the WTP warehouse. Lab solutions are prepared and diluted with deionised or distilled water. Lab solutions are prepared from commercial products used in the operations. The solution’s concentrations are determinates by the lab operator in accordance with the volumes of Jar test beakers and with the selected water sample volume used for the trial tests. In general we dilute commercial products at 1% and 1‰ in order to facilitate the dosing dilutions and calculations. In our plant we are stocking the followings products that will be used for the jar test trials: Aluminium sulphate – Al2 (SO4)

3.18H2O Supplier: Aspect: White Crystal Odor: none Caution: Yes (causes serious eye damage) Use: Water coagulation Bulk density: 1,2 Solubility in water 650 g/l at 10°C Technical product: AL2O3 concentrated at 17 à 18% Packaging: bag 25kg CALCIUM DI-HYDROXYDE – Ca (OH)2 Supplier: Aspect: White powder Odor: none Caution: Yes (handle with care) Use: Water flocculation / pH correction / mineralization Bulk density: 1.0 Solubility in water 1.65 g/l at 20°C Technical product: Ca concentrated at 95% Packaging: bag 25kg




CALCIUM HYPOCHLORITE – Ca (ClO)2 Supplier: Aspect: White powder Odour: strong and toxic / hazardous gases caution: yes (causes burns, etc ...) Use: Disinfection operations Bulk density: 1.0 Solubility in water 40 g/L at 15°C Technical product: 66% minimum Packaging: 25kg barrel

POLYMER – FLOPAM FO 4115 (Cationic) Supplier: SNF FLOERGER Aspect: White powder Odour: none Caution: Yes (handle with care / viscous) Use: Water and sludge flocculation Bulk density: 1.0 Solubility in water 5 g/l maximum Technical product: Polyacrylamide cationic very high molecular weight Packaging: bag 25kg POLYMER – FLOPAM AN 910 (anionic) Supplier: SNF FLOERGER Aspect: White powder Odour: none Caution: Yes (handle with care / viscous) Use: Water and sludge flocculation Bulk density: 1.0 Solubility in water 5 g/l maximum Technical product: Polyacrylamide anionic Packaging: bag 25kg




12.1.2. Aluminium sulphate solutions

Aluminium sulphate – Al2 (SO4)

3.18H2O

Lab stock solution 100 g/L Diluted solution used for the tests 10 g/L

A - Stock 250ml solution preparation (100 g/l)

Weigh 25 g of aluminium sulphate crystals to introduce into a screw cap 250 ml bottle

Fill with distilled water until the liquid level reaches the 250 ml graduation

Close the test tube and mix thoroughly until complete dissolution of crystals (If we have enough time, we can let the crystals dissolve, and when crystals are very few, stirred to complete the dissolution and mixing).

We thus obtain a stock solution at 100 g/L that we can keep safe 5 to 6 months away from the light.

B - Prepare a 50ml diluted solution for the trial tests (10 g/l)

Pipettes 5 ml of the stock solution and inject it in a erlenmeyer volume 250 ml


Close the erlenmeyer and mix thoroughly during 4 to 5 minutes

This solution must be prepared just before starting the jar tests.

So according with injected volume of solution into 1 litter volume of sampled water to test we

can define the treatment dosing rates as follow:

injected ml volume of 10.0 g/l solution Water treatment dosing rate as g/m3

0.5 ml 5.00 g/m3

0.6 ml 6.00 g/m3

0.7 ml 7.00 g/m3

0.8 ml 8.00 g/m3

0.9 ml 9.00 g/m3

1.0 ml 10.0 g/m3

2.0 ml 20.0 g/m3

3.0 ml 30.0 g/m3

4.0 ml 40.0 g/m3

5.0 ml 50.0 g/m3




12.1.3. Lime of milk solutions

Calcium di-hydroxide – Ca (OH)

2



Weigh 5 g of lime crystals to introduce into a screw cap 250 ml bottle


Close the test tube and mix thoroughly until complete dissolution of crystals

We thus obtain a stock solution at 20 g/L that we can keep safe 3 to 4 weeks away from the light.

Whenever you wish to use lime milk, strongly shakes the bottle before pipettes lime of milk.


Pipettes 12.5 ml of the stock solution and inject it in a erlenmeyer volume 250 ml


Close the test tube and mix thoroughly during 4 to 5 minutes






0.5 ml 2.50 g/m3

0.6 ml 3.00 g/m3

0.7 ml 3.50 g/m3

0.8 ml 4.00 g/m3

0.9 ml 4.50 g/m3

1.0 ml 5.00 g/m3

2.0 ml 10.0 g/m3

3.0 ml 15.0 g/m3

4.0 ml 20.0 g/m3

5.0 ml 25.0 g/m3

10.0 ml 50.00 g/m3




12.1.4. Cationic polymer solution

Polymer cationic


A - Stock 100ml solution preparation (3.0 g/l)

Weigh 0.3 g of cationic polymer powder to introduce into a screw cap 100 ml bottle


Mix thoroughly 20 to 30 minutes until complete dissolution of powder traces

We thus obtain a stock solution at 3.0 g/L that we can keep safe 1 week away from the light.

B - Prepare a 25ml diluted solution for the trial tests (1.0 g/l)

Pipettes 8.33ml of the stock solution and inject it in a erlenmeyer volume 50 ml


Mix thoroughly during 15 minutes





0.1 ml 0.1 g/m3

0.2 ml 0.2 g/m3

0.3 ml 0.3 g/m3

0.4 ml 0.4 g/m3

0.5 ml 0.5 g/m3

0.6 ml 0.6 g/m3

0.7 ml 0.7 g/m3

0.8 ml 0.8 g/m3

0.9 ml 0.9 g/m3

1.0 ml 1.0 g/m3




12.1.5. Anionic polymer solution

Polymer anionic


A - Stock 100ml solution preparation (3.0 g/l)

Weigh 0.3 g of anionic polymer powder to introduce into a screw cap 100 ml bottle


Mix thoroughly 20 to 30 minutes until complete dissolution of powder traces

We thus obtain a stock solution at 3.0 g/L that we can keep safe 1 week away from the light.

B - Prepare a 25ml diluted solution for the trial tests (1.0 g/l)

Pipettes 8.33ml of the stock solution and inject it in a erlenmeyer volume 50 ml


Mix thoroughly during 15 minutes





0.1 ml 0.1 g/m3

0.2 ml 0.2 g/m3

0.3 ml 0.3 g/m3

0.4 ml 0.4 g/m3

0.5 ml 0.5 g/m3

0.6 ml 0.6 g/m3

0.7 ml 0.7 g/m3

0.8 ml 0.8 g/m3

0.9 ml 0.9 g/m3

1.0 ml 1.0 g/m3




12.1.6. Chlorine solutions

Calcium hypochlorite – Ca (ClO)

2



Weigh 5 g of chlorine powder form to introduce into a screw cap 250 ml bottle


Close the test tube and mix thoroughly until complete dissolution of crystals

We thus obtain a stock solution at 20 g/L that we can keep safe 1 week away from the light.



Pipettes 5 ml of the stock solution and inject it in a erlenmeyer volume 250 ml


Close the test tube and mix thoroughly during 4 to 5 minutes





0.5 ml 0.5 g/m3

0.6 ml 0.6 g/m3

0.7 ml 0.7 g/m3

0.8 ml 0.8 g/m3

0.9 ml 0.9 g/m3

1.0 ml 1.0 g/m3

2.0 ml 2.0 g/m3

3.0 ml 3.0 g/m3

4.0 ml 4.0 g/m3

5.0 ml 5.0 g/m3

10.0 ml 10.00 g/m3




12.2. JAR TEST TRIALS

Prepare your test by checking the followings devices are available:

1 jar laboratory test allowing mixing at the same speed, 6 x 1 liter beakers

6 x 1 litter beakers

Electronic balance multipurpose 0 to 2100g readability 1,0 mg

Glass volumetric pipettes 1,0; 2.0; 5,0; 10; 50 ML

Manual pipette filler

Variable Micropipette & accessories 5 to 200 – 200 to 1000 – 1000 to 5000 µL

Syrup density meter 1000 to 1100 g & 1000 to 1200 g

Flask Erlenmeyer 100; 250; 500 ML

Graduated beaker low wall 100; 250; 400 ML

Graduated cylinder 500; 1000 ML

Screw cap bottle 100; 250; 500 ML

Thermometer 0 – 100°

Digital timer / Clock

Spatula single spoon

Magnetic stirrer

Magnetic Stir bar PTFE

1 turbidity analyzer

1 pH analyzer

1 free chlorine analyzer

Jar test trial data sheet

Paper towel

Trash can for laboratory dumps

PPE / glasses / gloves / etc.

First aid box

12.2.1. Jar test trials data sheet

If you please, here is a jar test trial data sheet model for recording the proceedings and outcomes of the tests




12.2.2. Jar test procedure

Steps 1, 2, 3 4, (possibility to sample up to 3 different water quality from different sampling points) Sample 10L of water to be analyzed into a bucket or jerry can Perform pH, NTU, °C, µS/cm, TSS, TAC, TA, TH, density, TDS… on sampled water and records. Shake the water and pour 1L into each beaker Place the beakers in the jar test and move down the stirring beakers then switch on stirrers and run at fast speed Step 5, (coagulation) Confirm if you are using ml or µl pipette volume injection Step 6, Inject and record how many ml or µl you injected into each one of beaker Start stirring set at high speed 150 to 200 rpm Start backward counter time 2.0 mn Step 7, Note name of reagent and solution concentration is used Note the set stirring high speed 150 to 200 rpm Note the set backward counter time 2.0 mn After 2.0mn stirring mixers stop Note the pH of water in each one of beaker Note elapsed time to flocks appears Step 8, (flocculation test 1) Confirm if you are using ml or µl pipette volume injection Step 9, Inject and record how many ml or µl you injected into each one of beaker Start stirring set at high speed 20 to 40 rpm Start backward counter time 20.0 mn Step 10, Note name of reagent and solution concentration is used Note the set stirring high speed 20 to 40 rpm Note the set backward counter time 20.0 mn After 20.0mn stirring mixers stop Note the pH of water in each one of beaker Step 11, (flocculation adjuvant test 2) Confirm if you are using ml or µl pipette volume injection Step 12, Inject and record how many ml or µl you injected into each one of beaker Start stirring set at high speed 20 to 40 rpm Start backward counter time 20.0 mn Step 13, Note name of reagent and solution concentration is used Note the set stirring high speed 20 to 40 rpm Note the set backward counter time 20.0 mn After 20.0mn stirring mixers stop Note the pH of water in each one of beaker Step 14, (not used in our process)




Grading system To give a comparative dimension to the test results we will use this scoring grid below:

scoring flocculation clarification

0 no flocculation no clarification 2 Opalescent flocks Poor clarification 4 Small flocks Trouble water 6 Average flock Good clarification 8 Good flocculation Clear water

10 Very good flocculation excellent

Step 15, (end of stirring - step of sludge settling) Move up the stirring beakers and start backward counter time 30.0 mn Note volume of separated sludge after 10mn settling Step 16, Note volume of separated sludge after 20mn settling Step 17, Note the best score of flocculation & clarification you give to each one of beaker Note volume of separated sludge after 30mn settling Step 18, Note which number of the beaker/treatment you select Step 19, Performs water analyses on all the beakers Step 20, Notes your observations

12.2.3. PH of flocculation

In order to ensure the aluminium salts coagulation efficiency and to avoid that the aluminium salts

dissolved contents concentration in treated water is over to 0.2ppm it is necessary to maintain the

flocculated /clarified water pH comprising from 6.5 to 8.0.

As long as this target is not reached, so repeat the test selecting different combinations and/or dosing of the selected reagents. And if necessary; select another type of polymer (anionic or cationic at different molecular weight)




12.3. Water chlorination demand

12.3.1. Purpose

It is the determination of the chlorine dosing rate it is necessary to inject into the filtered water in order to achieve optimum disinfecting of treated water distributed to the network.

12.3.2. Requested equipments

6x 1L flasks with caps

1 x10ml graduated pipette

1 x25ml graduated pipette

1 x1000ml graduated cylinder

2 x200ml colored glass bottles with caps

12.3.3. Preparation of solution

Before to perform the "chlorine test" it is prepared a diluted chlorine solution concentrated at 1 g / L. The diluted solution will be prepared using clean water virtually free of organic materials contents or using commercial drinking mineral water bottle. Stock solutions of 20.0g / L chlorine concentration can be kept one month away from light within colored glass bottle. The calcium hypochlorite used for the "chlorine test" is the commercial product

12.3.4. Disinfection dosing rate

Use a series of six bottles of 1000ml. Fill with water to be tested Use the diluted solution at 1 g /L and using a 10 ml graduated pipette injecting increasing doses of total chlorine into each one of the 6 flasks

1.0ml into the flask N° 1 so 1.0 mg/l

2.0ml into the flask N° 2 so 2.0 mg/l 3.0ml into the flask N° 3 so 3.0 mg/l 4.0ml into the flask N° 4 so 4.0 mg/l 5.0ml into the flask N° 5 so 5.0 mg/l 6.0ml into the flask N° 6 so 6.0 mg/l

Close the 6 flaks with caps and shake the flasks then place them away from light and at a constant temperature. After 15 mn, measure the free chlorine concentration in water remaining. After 2.0 hrs, measure the free chlorine concentration in water remaining. The selected dose is the one in which the content of free chlorine concentration is 1.5 to 3.0 mg / l. If the required dosage isn’t reached, so repeat the test injecting larger total chlorine doses.




13. ANNEXES

13.1. DS - Analogical instruments

13.2. DS - Logical instruments

13.3. DS - Pumps

13.4. DS - Air utilities

13.5. DS - Mixers

13.6. DS – VSD’S

13.7. DS - Valves