Quy trình vận hành nhà máy xử lý nước thải Volume 2a EN

TABLE OF CONTENTS I INTRODUCTION II DESCRIPTION III OVERALL PROCESS DESCRIPTION IV GENERAL CONTROL SYSTEM AND OPERATION V MAINTENANCE OF SEWAGE TREATMENT PLANT VI PLANT LAYOUT & PIPING V

TABLE OF CONTENTS

I) INTRODUCTION

II) DESCRIPTION

III) OVERALL PROCESS DESCRIPTION

IV) GENERAL CONTROL SYSTEM AND OPERATION

V) MAINTENANCE OF SEWAGE TREATMENT PLANT

VI) PLANT LAYOUT & PIPING

VII) HAYDRAUILC PROFILE

VIII) PLANT LEVEL

IX) DETAILED DESIGN DATA AND UNIT EFFICIANCY

1 LIQUID STREAM

1.1 RIVERINTAKEWORKS

1.1.1 General Description:

1.1.2 Intake Works Equipment

1.1.3 Intake Works Instruments

1.1.4 P&I Diagram

1.1.5 Process Description

1.1.6 CONTROL PHILOSOPHY

1.1.7 Equipment description, Operation, and Maintenance

1.1.7.1 Debris Removal System Trash rake

1.2.2 Intake Chamber Equipment

1.2.3 Intake Chamber Instrumentation

1.2.4 Intake Structure P&I Diagram

1.2.7 CONTROL PHILOSOPHY

1.2.8 Intake Structure Equipments Description, Operation, and Maintenance 1.2.8.1 Penstocks

1.2.8.2 Mechanical Screen Description, Operation & Maintenance

1.2.8.3 SPIRAL PRESS CONVEYOR

1.2.9 Intake Structure Check List

1.3 KIMNGUUGRITCHAMBER

1.3.6.3 KN Grit Chamber Penstocks

1.4 SETRIVERGRITCHAMBERS

1.4.1 Set River Grit Chamber General Description

1.4.2 Set River Grit Chamber Equipment

1.4.3 Set River Grit Chamber P&I Diagram

1.4.7 Grit Chamber Checklist

1.5 KIMNGUUCOARSESCREEN

1.5.1 Kim Nguu Coarse Screen General Description

1.5.2 Kim Nguu Coarse Screen Equipment

1.5.3 Kim Nguu Coarse Screen Instruments

1.5.4 Kim Nguu Coarse Screen P&ID Diagram

1.5.5 Process Descrrription

1.5.6 Control Philosophy

1.5.7 Equipment Description, Operation, and Maintenance

1.5.7.1 Mechanical Coarse Screen

1.5.7.2 Penstocks

1.5.7.3 Conveyor

1.6 KIMNGUUEMERGENCYBYPASSSCREENS

1.6.1 Bypass Screen P&ID Diagram

1.6.2 PROCESS DESCRIPTION

1.6.3 CONTROL PHILOSOPHY

1.7 SETRIVERCOARSESCREENS

1.7.1 Set River Coarse Screen General Description

1.7.2 Set River Coarse Screen Equipment

1.7.3 Set River Coarse Screen Instruments

1.7.4 Set River P&I Diagram

1.7.5 Process Description

1.7.6 Control Philosophy

1.7.7 Equipment Description, Operation, and Maintenance

1.7.7.1 Mechanical Coarse Screen

1.7.7.2 Penstocks

1.7.7.3 Conveyor

1.8 SETEMERGENCYBYPASSSCREEN

1.8.1 Set River P&I Diagram

1.8.2 PROCESS DESCRIPTION

1.8.3 Control Philosophy

1.9 KIMNGUURIVERMAININLETPUMPINGSTATION

1.9.1 Kim Nguu Main Inlet Pumping Station General Description

1.9.2 KN Main Inlet Pump Station Equipment

1.9.3 KN Main Inlet Pump Station Instrument

1.9.4 KN Main Inlet Pump Station P&ID Diagram

1.9.5 KN Main Inlet Pump Station Process Description

1.9.6 KN Main Inlet Pump Station Control Philosophy

1.9.7 KN Main Inlet Pump Station Equipment Description, Operation, & Maintenance 1.9.7.1 ABS Submersible Sewage Pumps

1.10 SETRIVERMAININLETPUMPINGSTATION

1.10.1 Set River Main Inlet Pumping Station General Description

1.10.2 Set River Main Inlet Pump Station Equipment

1.10.3 Set River Main Inlet Pump Station Instrument

1.10.4 Set River Main Inlet Pump Station P&I Diagram

1.10.5 Set River Main Inlet Pump Station Process Description

1.10.6 Set River Main Inlet Pump Station Control Philosophy

1.10.7 Set River Main Inlet Pump Station Equipment Description, Operation, & Maintenance 1.10.7.1 ABS Submersible Sewage Pumps

1.10.7.2 Penstocks

1.10.8 Main Inlet Pump Station Check List

1.11.1 Preliminary Treatment Works General Description

1.11.2 Equipment

1.11.3 Fine Screen Instruments

1.11.4 Fine Screen P&I Diagram

1.11.5 Fine Screen Process Description

1.11.6 Fine Screen Control Philosophy

1.11.7 Fine Screen Equipment Description, Operation, and Maintenance

1.11.7.1 Bromet Fine Screen

1.11.7.2 Penstocks

1.11.7.3 Conveyor

1.11.8 Fine Screen Checklist

1.12 EMERGENCY BYPASS SCREEN

1.12.1 P&I Diagram

1.12.2 Process Description

1.13.1 Grit Grease removal General Description

1.13.2 Grit Grease removal Equipment

1.13.3 Grit Grease removal Instrument

1.13.4 Grit Grease removal P&I Diagram

1.13.5 Grit Grease removal Process Description

1.13.6 Grit Grease removal Control Philosophy

1.13.7 Grit Grease removal Equipment Description, Operation, and Maintenance 1.13.7.1 Travelling Bridge Scraper

1.13.8 Grit Grease Channel Checklist

1.14 GRITREMOVALPUMPS

1.14.1 General Description

1.14.2 Grit Removal Pumps Equipment

1.14.3 Grit Removal Pumps Instrument

1.14.4 Grit Removal Pumps P&I Diagram

1.14.5 Grit Removal Pumps Process Description

1.14.6 Grit Removal Pumps Control Philosophy

1.14.7 Grit Removal Pumps Equipment Description, Operation, and Maintenance 1.14.8 Grit Pumps and Classifiers Checklist

1.15 PRELIMINARYTREATMENTWORKSGRITCLASSIFIER

1.15.1 Grit Classifier General Description

1.15.2 Grit Classifier Equipment

1.15.3 Grit Classifier Instrument

1.15.4 Grit Classifier P&I Diagram

1.15.5 Grit Classifier Process Description

1.15.6 Grit Classifier Control Philosophy

1.15.7 Grit Classifier Equipment

1.15.7.1 Grit Classifiers

1.16 GRIT/GREASEREMOVALTANKAIRBLOWERS

1.16.1 General Description

1.16.2 Air Blowers Equipment

1.16.3 Air Blowers Instruments

1.16.4 Air Blowers P&I Diagram

1.16.5 Air Blowers Process Description

1.16.6 Air Blowers Control Philosophy

1.16.7 Air Blowers Equipment Description, Operation, and Maintenance

1.16.8 Grit Grease Air Blowers Checklist

1.17.1 General Description

1.17.2 Equipment Inventory of a SBR Basin

1.17.4 SBR P&I Diagram

1.17.5 SBR Process Description

1.17.6 SBR CONTROL PHILOSOPHY

1.17.7 SBR Equipments Description, Operation, and Maintenance

1.17.7.1 WAS & RAS Pumps

1.17.7.2 Surface Skimming Decanters

1.17.8 SBR Basins Checklists

1.18 SBRAIRBLOWERS

1.18.1 General Description

1.18.2 Air Blowers Equipments

1.18.3 Air Blowers Instruments

1.18.4 Air Blowers P&I Diagram

1.18.5 Air Blowers Process Description

1.19.2 Cooling System Equipment

1.19.3 Cooling System P&I Diagram

1.19.4 Cooling System Process Description

1.20.7 EQUIPMENT DESCRIPTION OPERATION & MAINTENANCE

 Brief about the general process, and detailed design data

II) DESCRIPTION

The Yen So Sewage Treatment Plant is located in Hoang Mai district, about 6km south of Hanoi, Vietnam The influents derive from two 'River' sources, which are currently used as open sewer culverts that are also subject to storm water flows The flow is screened, degritted and degreased prior to sequencing batch reactor activated sludge technology followed by UV and membrane treatments for proportions of the SBR treated flows SBR flows are discharged to the Kim Nguu River, while UV disinfected effluents are discharged to the Yen So lakes Membrane treated SBR effluent is for works reuse

Yen So Treatment Plant consist of

1

2

1,2& 3 Yen So Sludge Stream Layout

Yen So Support Structures

III) OVERALL PROCESS DESCRIPTION

The project is for the design and build of a new Sewage Treatment Plant (STP) at Yen So Park located in Hanoi, Vietnam The proposed new treatment works comprise of new river debris removal systems, grit chambers, 25mm coarse screens, main inlet pumping stations, 6mm fine screens, grit and grease removal tanks, sequential batch reactor (SBR) basins, UV disinfection units, tertiary filtration plant, filtrate treatment plant , sludge storage facilities, gravity belt thickeners, sludge digesters, gas holders, centrifuge dewaterers, odour removal systems, polyelectrolyte dosing systems, carbon dosing system and alkalinity dosing system

The Sewage Treatment Plant at Yen So Park receives flows from Kim Nguu River, Set River and the future sewerage network from the Yen So development The works is designed to treat a maximum of 200,000 m3/ day with a peak hourly flowrate of 2.1 times this The flow to treatment passes through river intake screens mounted in the riverbank; three for Kim Nguu and two for Set Screenings are collected and disposed of in skips Each screen is isolated by wall mounted actuated penstocks After river screening, the flow passes to two sets of two number grit chambers Grit is removed and is classified prior

to disposal to skips for removal The liquor from the grit classifiers is returned to the common inlet channel and each grit chamber is isolated by wall-mounted penstocks

After grit removal, the flow is piped to the main inlet pumping stations where it passes through the

25mm coarse screens The Kim Nguu river flow passes through three parallel screens and Set river flow through two The Kim Nguu flow will in future be augmented by a further flow from the Yen So development Each screen is channel mounted and completed with actuated isolation penstocks and emergency bypass hand raked screens

After coarse screening, each river stream is pumped via dedicated main inlet pumping stations (MIPS) to the combined 6mm fine screening stage Kim Nguu and Set pump stations each comprise of 6 No fixed speed submersible pumps operating on 4 No duty and 2 No standby configuration

The combined fine screen process includes 4 parallel channel mounted 6mm screens and an emergency bypass hand raked screen Each screen is isolated by actuated penstocks The screenings are transferred to

a skip for disposal

Following fine screening, the combined flow passes to a grit/ grease removal stage There are four grit/ grease removal tanks Grit is removed from the front hopper of the tank by dedicated grit pumps and pumped to 2 No grit classifiers Grit is disposed via skip and effluent drained to the Kim Nguu main inlet pump station Grease is floated by air to the surface of the tank and removed by scraper to an outlet hopper for removal by skip The air is introduced to the base on the tank via a common header supplied

by four number air blowers

After the grit/ grease removal tanks, the flow gravitates to the sequential batch reactor (SBR) basins There are eight treatment basins operating in two modules The SBR basins in each module treat sewage

Each SBR undergoes a treatment cycle that consists of the fill, react, settle and decant sequences During the fill sequence, the SBR basin is filled with untreated sewage Once the SBR basin is filled, aeration commences which is known as the react sequence After the treatment process is complete, the aeration is stopped and biomass will be allowed to settle to the bottom of the tanks (settle sequence) When the biomass has settled, a layer of clear treated water at the top of the SBR basin is removed by two decanters during the decant sequence

Each SBR module has 6 No air blowers, operating in a 4 No duty and 2 No standby configurations Excess biomass from each of the SBR basins is removed during the settle sequence by 2 No waste activated sludge (WAS) pumps and directed to the sludge holding tanks Return activated sludge (RAS) is returned to the bioselectors for simultaneous nitrification denitrification and enhanced biological phosphorus removal by 2 No RAS pumps A carbon dosing system and alkalinity dosing system is provided and doses upstream of the SBR basins for adjustment of influent

Effluent from the SBR basins is channelled into UV disinfection units and the remaining treated effluent from the SBR basins is discharged back into the Kim Nguu River After UV disinfection, 3,000m3/ d of the treated effluent undergoes tertiary treatment before being recycled for plant usage Tertiary treatment comprises of 2 No hollow fibre membrane filtration (HFMS) units operating in parallel The remaining water after UV disinfection shall be discharged directly into Yen So Lake

Sludge holding tanks are provided to store the SBR waste sludge From the sludge holding tanks, the sludge is transferred to 4 No gravity belt thickeners that are employed for sludge thickening Sludge is fed into a static flocculator tank by means of 6 No thickener feed progressive cavity pumps (4 duty/ 2 standby) Polymer is dosed into the sludge prior to the thickeners to flocculate fine particles Filtrate from the sludge thickeners will flow to the Kim Nguu main inlet pump station

From the sludge thickeners, the thickened sludge is stored in the 2 No thickened sludge storage tanks to allow continuous flow to the sludge digesters A macerator is installed in each thickened sludge holding tank outlet to macerate any solids left in the sludge before being fed to the sludge digester The thickened sludge is fed to 2 No anaerobic digesters to reduce the thickened sludge volatile suspended solids content The gas generated by the digesters is stored in 2 No double membrane type gas holders Part of the gas use to mix the sludge in the digesters, part of it used to heat the digester sludge and the remaining gas shall be flared off

The digested sludge gravitate to the 2 No digested sludge storage tanks Digested sludge feed to 4 No centrifuge dewaterers to dewater the digested sludge via 6 No fixed speed progressive cavity dewaterer feed pumps (4 duty/2 standby) The sludge cake is conveyed to sludge storage area where transferred to skips for disposal off site Centrate from the dewatering units flow to the works liquor tank Polymer is dosed into the sludge prior to the dewaterers to flocculate fine particles to increase dewatering efficiency

The polyelectrolyte dosing system is designed to accept powder supply Powdered dry polyelectrolyte is stored in big bags and is transferred to a hopper The hopper discharges into the powder feeder that feeds the polymer mixing tank Service water from the service water booster pumps is added to the polymer

mixing tank to make up the polyelectrolyte solution Polyelectrolyte solution is drawn from the storage tank by 4 No dosing pumps and is dosed into each thickener feed pump delivery There are separate polyelectrolyte dosing systems provided for both the thickening and dewatering plant

Filtrate from sludge dewatering centrifuges gravitates into the filtrate holding tank before being fed to the FSBRs A bypass is provided from this holding tank back to manhole MH26B from where filtrate could

be returned directly to the main SBR process in case that the FSBRs are only partially or not operational during maintenance activities, or in case that the influent sewage and operational conditions do not require utilisation of the FSBRs

Potentially odorous air is drawn from the main inlet pumping stations, coarse screens, 6mm screens, grit and grease removal tanks, grit handling plant, works liquor tank, sludge holding tanks, sludge thickening units, thickened sludge holding tank, digested sludge storage tank, sludge dewatering units, collection skip for Kim Nguu and Set River debris removal to 4 No odour control facilities

IV) GENERAL CONTROL SYSTEM AND OPERATION

The treatment works is designed to run with minimum of operator intervention

The control system is based around a series of Programmable Logic Controllers (PLC's) working in conjunction with their associated Motor Control Centres (MCC‘s), local control panels (if applicable) and field instrumentation, and supervised by a Supervisory Control And Data Acquisition system (SCADA)

All data required for continuous monitoring of the plant will be made available to the operator via a telemetry link

DEFINITIONS

Unless otherwise stated, the following definitions shall apply throughout this section of manual:

I Automatic Control Mode

The operation of individual items or groups of equipment in Automated control mode will be by a works PLC, or specific control equipment in the field, without the need for operator intervention

II Manual Control Mode

The operation of individual items of equipment in MANUAL control mode will be via a works PLC, specific control equipment or by operator intervention from a suitable interface e.g a panel mounted operator interface or Human Machine Interface (HMI) system

All specific automated sequences associated with the equipment will be inhibited

III Hand Control Mode

The operation of individual items of equipment in HAND control mode will be via operator intervention from a relevant MCC or local control panel All control of the equipment via any works PLC or specific control based on field instrumentation will be inhibited

All specific automated sequences associated with equipment will be inhibited

When in HAND control mode equipment can be controlled in REMOTE HAND control mode or LOCAL HAND control mode (where applicable)

a Remote Hand Control Mode

The operation of individual items of equipment in REMOTE HAND control mode will be via operator intervention from a relevant MCC or local control panel All control of the equipment via any works PLC, or specific control equipment in the field, will be disabled All specific automated sequences associated with the equipment will be inhibited

b Local Hand Control Mode

The operation of individual items of equipment in LOCAL HAND control mode will be via operator intervention at or immediately adjacent to the equipment All control of the equipment via any works PLC, specific control equipment in the field, relevant MCC or local control panel will be disabled All specific automated sequences associated with the equipment will be inhibited

Prevent normal operation by means of software interlock

Software interlocks normally operate in automatic control mode only In this mode the PLC prevents control of the unit according to the automatic control sequence Hardwired control can override this condition

V Permit

Allow normal operation by removal of software interlock

In this mode, PLC controls the unit according to the automatic control sequence Hardwired control can override this condition

VI Disable

Prevent operation by means of hardwired interlock

The interlock normally prevents operation in all modes (Specific exceptions will be detailed in the relevant section.)

VII Enable

Allow normal operation by removal of hardwired interlock

Manual reset may be required before Enable signal allows restart of equipment (Details will be provided in the relevant section.)

VIII General

Unless otherwise stated, the following will apply as general principles:

a Under normal operation, the treatment works will be controlled via the

PLC(s) and can be monitored from the HMI

b All analogue flow, level, pressure and quality instruments will give a

continuous display at the control panel In addition all analogue flow meters will provide an integrated total

c All alarm conditions will be displayed at the HMI or local control panel

where provided

d All motor drive hardwired failures e.g overload trip, pump seal failure

etc., will be alarmed at the relevant MCC Motor drive failures generated

by software will be alarmed at the HMI

f Selector switches at the works MCCs will allow all motor drives to be designated as operating in ―AUTO" control mode, " HAND" control mode or OFF

If a switch designates "AUTO" control mode then all operation of the respective motor will be controlled via the PLC

When the selector is switched into "HAND" control mode then the respective motor will be controlled from the respective MCC The motor speed of variable speed drives can be adjusted by the operator at the relevant MCC using a potentiometer All control via the PLC will be disabled

If a switch designates OFF then all operation of the respective motor will

be disabled, and the motor isolated from all PLC and MCC control

g All motorised valve actuators will have the facility to be designated as operating in

" AUTO" control mode, " LOCAL" control mode at the actuator or REMOTE control mode at the HMI

If "AUTO" control mode is selected then all operation of the respective actuator will be controlled via the PLC

If "LOCAL" control mode is selected then the actuator will be controlled from the actuator All control via the PLC will be disabled

h A duty to standby change-over will occur upon failure of the duty

equipment if the respective duty and standby mode selector switches at the MCC are both designated in ―AUTO control mode If either or both the duty and standby equipment mode selector switches at the MCC are not designated in AUTO control mode, then the changeover will be inhibited and an alarm raised at the PLC

i Rotating or electric motor driven process equipment will be supplied with emergency stop push buttons, where applicable, which are operative in all control modes All emergency stop push buttons will be the "stay-put" type requiring to be reset by hand

j Hardwired interlocks will override control in all modes Hardwired trips will be manually reset by individual push-buttons at the respective MCC

k On failure of any control instrument, the PLC will use the last known value for control purposes and an alarm raised at the PLC, unless stated

otherwise

V) MAINTENANCE OF SEWAGE TREATMENT PLANT

Preventative Maintenance

Routine inspection and maintenance is important in preventing breakdown and help to prolong the service life of the equipment and improve the downtime of the plant It can also identify malfunctions in the preliminary stages and reduce the repair to the minimum Preventative maintenance involves the servicing, repair or replacement of items subject to normal wear and tear on a scheduled basis

Owing to the varied time, conditions and circumstances of equipment usage, it is impossible to set the equipments and periods for regular inspection and maintenance However, as a guide it is recommended

to perform periodic maintenance according to the schedule reproduced below Others may be added when adverse or unusual service conditions exist These schedules are only for guidance – where if these differ

in any aspect from the Manufacturer‘s recommendations, the latter shall take precedence

For safety reason, but only properly trained personnel who familiarize themselves with the equipment must carry out maintenance and repair

Systematic routine and records should be kept on the equipment which contains at least the following, among others:

 Complete equipment data

 List of spare parts

 Service records (including dates and results of routine inspections and repairs)

 Lubrication data, including types of lubricants used and the maintenance cycle Always use lubricants as recommended by the manufacturer

Breakdown Maintenance

Breakdown maintenance is undertaken "on demand" when an equipment can no longer be operated The Breakdown Maintenance has two components:

1 Defect or malfunction covered within the defects liability period :

 Defective or Insufficient Design;

 Defective Materials;

 Defective Installation / Workmanship;

 Inadequate Maintenance

2 Defect or malfunction other than that described above For example:

 Exposed pipework or fittings damaged in automobile accidents;

 Generator failure as a result of coolant or lubricant not having been checked and topped up;

 Force Majeure

In addition to the normal contractual obligation to rectify defective work, replace defective materials, and correct design insufficiencies, a procedure will be implemented to enable the probable cause of a problem

to be investigated and the cost of rectification to be properly allocated

In the first instance, the contractor will attend to site and assess the extent of damage and necessary repairs Items of a minor nature (not requiring major parts replacement) will be repaired under the terms

of the contract and a full report submitted to the Contractor's Operations & Maintenance Manager

Items of a major nature, and for which stand-by facilities are available, will, after initial investigation by the Contractor, be subjected to a joint inspection by representatives of the Contractor, the Operating Agency, the Equipment Supplier and the Installation Sub Contractor, where appropriate

At this joint inspection, the circumstances surrounding the problem will be fully examined and the probable cause or causes identified and agreed The party or parties deemed responsible will themselves arrange for the necessary repair work to be carried out or will request the Contractor to undertake this work on their behalf and at their cost

Should the parties to the joint inspection be unable to agree on the probable cause of the problem, the Contractor will issue instructions for the repair work to be undertaken on an interim basis The party or parties instructed to execute the repair work will forthwith carry out such work and will keep full and detailed records of the resources used Within 28 days of repairs being instructed, the Contractor will, with the full cooperation and agreement of all parties involved, prepare a fully detailed report on the repair works and submit this to the Employer for his decision

* Only qualified personnels are allowed to carry out maintenance works Please read manufacturer‘s manual thoroughly prior to any maintenance works

Items Supplied by the Operating Agency

All capital or consumable items which are not associated with the maintenance of Mechanical and Electrical and Chemical Equipment supplied under the Contract are to be provided and where appropriate, fitted or installed by the Operating Agency including, but not limited to:

 Water Treatment / Disinfection Chemicals

 Topping Up of Filtration Media

 Water for Disinfection / Flushing / Testing

 Power (electricity)

 Petrol, Diesel and Lubrication Oil

 Grease

 Gear/Lubrication oil

 Air /Fuel / Oil filters

 Transformer lubricating oil / gases

 Silica gel

 Mechanical seal

 Oil seal, seal and O-ring

 Pump diaphragm, damper and rubber bellow

 Sealed bearings

 Rubber coupling

 Drive belts

 Chlorine Connecting Tubing

 Chlorine leak detector sensor

 On-line Analyzer sensors

 Lead gasket

 Ammonia solution

 Refrigerant for air-conditioning unit

 Laboratory Chemicals / Reagent

 Light Bulbs / Fluorescent Tubes and starters

 Fuses / MCB

 Wear Pads/Shoes for Sludge Scraper

 Wear & Tear Items

 Paint

 Items necessary for the maintenance of Infrastructure:

 (Structures, Chambers, Buildings, Roads, Drains, Embankments, Fences etc.)

VI) PLANT LAYOUT & PIPING

item Description No Diameter

VII) HYDRAULIC PROFILE

Yen So Park STP is located in Hanoi, Vietnam It is to be constructed as part of the JICA Hanoi Sewerage Master Plan It is proposed the sewage treatment works treats the river water from the Kim Nguu River at 125,000 m³/d and Set River at 65,000m³/d and an additional 10,000m³/d from sewer connections These rivers are heavily polluted by the sewage which drains directly from Hanoi City

Yen So Park STP will consist of a river intake system in the River Set and River Kim Nguu From each intake system the flow gravitates to the main inlet pumping station

The flow is then pumped to preliminary treatment which consists of 3 Duty/1 standby fine screens with an emergency bypass manual bar screen, and 3 duty/1 standby grit grease removal tanks

From here the flow enters by gravity a sequencing batch reactor plant, consisting of 2 No.Modules each consisting of 4 No.SBR basins

133,000m³/d (67,000m³/d initially) of the treated flow will to gravitate to a UV system consisting of 4 Duty UV units and then discharge to Yen So Lake 1 (Pond), south of the site The remaining effluent from the SBR plant will gravitate to a discharge point in the Kim Nguu Canal to the west of the site

3,000m³/d of the UV treated flow is pumped to a membrane treatment plant for further treatment so it can then be recycled back into the plant for any water use requirements

and feed to SBRs

5.03 m³/s

1.539 m³/s

Starting top water levels

Effluent (non UV treated) discharges from the sewage treatment works to the Kim Nguu River to the east

of the site

TWL in Kim Nguu River = 5.7 mAD

Effluent (UV treated) discharges from the sewage treatment works to the pond to the south of the site TWL in Pond = 4.5 Mad

SBR Effluent Channel to River

Flows up to 133,000 m³/d pass to the UV plant (67,000 m³/d initially) and any excess flow passes directly

to the River

Straight line losses from SBR effluent channel to the River

Discharge from the SBR plant to the River passes through two culverts due to the high flow rate

Total losses from SBR effluent channel exit to the River

Penstock from SBR effluent channel to the River

The maximum allowable TWL in the SBR effluent

channel

6.230 mAD

UV disinfection outlet to Yen So Lake I (Pond)

133,000m³/d of the main flow from the SBR plant is directed to a UV disinfection plant A proportion of the treated water from the UV disinfection plant gravitates to a pumping station where is pumped to a membrane plant for treatment to be recycled back into the sewage treatment plant The remaining treated effluent from the UV plant gravitates to south of the site to enter Yen So Lake I (Pond)

Straight line losses from UV outlet to the Pond

When membrane feed pumps are running,

Flow to discharge to the Pond from the UV plant 1.539 m³/s

VIII) PLANT LEVEL

IX) DETAILED DESIGN DATA AND UNIT EFFICIANCY

Table1 Design flows and loads

100 : 12 : 2.4

2.0 1.2 6.7 1.3

100 : 15 : 4.0

3.2 1.4 1.7 1.1

100 : 60 : 8 Design temperature (ºC) 24

Table 2 Discharge standards

-

-

- mg/l mg/l No./ml No./l

5

0 – 1 None None 6.5 – 8.5

< 20

< 3

0 – 10

0 - 1

Table 4 Effluent discharge standards according to QCVN 24:2009 / BTNMT

5 Total Oil & Grease

 Mineral oil & grease

 Animal- vegetable Fat & Oil

i-

mg/l mg/l

1 LIQUID STREAM

1.1.1 General Description:

Inlet Works

Influent is taken directly from the Set and Upper Kim Nguu rivers, and in the future from piped sewers from the Yen So development project The inlet structures consist of a main inlet pump station and two separate river intake works

Each river intake works is comprised of:

 Debris removal system

 Radial gates to ensure flow into works

 Intake screens @ 50mm

 Coarse grit separation and classification

The debris removal system consists of a floating boom and screen for removing floating debris Screened water will gravitate into the river intakes

Each of the intake works have multiple intake channels and mechanically raked coarse screens, as well as

a grit removal system

Combined influent sewage gravitate to the works, pass through a second set of screens, and be pumped to the preliminary treatment facilities for screening, grit and grease removal

Set Trash rake

Table Flows to intake structures

*From sewer network

NB According to specifications, the same volumes pump from the rivers regardless of the season Weir gates ensure a constant river level throughout the year

for Kim Nguu River

Max compacted volume produce

for Set River

1.1.2 Intake Works Equipment

Kim Nguu River Trash

Conveyor

Kim Nguu River Radial Weir

1.1.3 Intake Works Instruments

Kim Nguu Debris Removal System

Differential Level Transmitter

Set Debris Removal System

Differential Level Transmitter

1.1.4 Intake Works P&I Diagram

Reference P&I Diagram: YS/STP/DRG/IW/P&I/0001, Kim Nguu and Set River Debris Removal System

AMENDMENTS

PROJECT:

YEN SO PARK DEVELOPMENT

COPYRIGHT PROTECTED ALL RIGHT RESERVED

No part of this drawing may be reproduced, stored in a retrieval system or transmitted in any form or by any other means, electronic, mechanical, photocopy, recording or otherwise without prior permission from the Engineer

6-02A Prime Centre Building,

53 Quang Trung Street, Hai Ba Trung District, Hanoi, VIETNAM.

47400 Petaling Jaya, Selangor Darul Ehsan.

Tel : 03-7729 8094; Fax : 03-7722 4988

Selangor Darul Ehsan

Tel : 03-8943 3366; Fax : 03-8943 2691 / 03-8942 4105

SPECIALIST SUB-CONTRACTOR:

REI - BIWATER CONSORTIUM SDN BHD

Kampung Baru, 50300 Kuala Lumpur, Malaysia Main Office : Rumah Rohas, No 61, Jalan Raja Abdullah, Eng Office : Wisma Biwater, Plaza Damansara, 9 Medan Setia 1, Bukit Damansara, Tel : +603-2697 3900; Fax : +603-2697 0900

50490 Kuala Lumpur, Malaysia Tel : +603-2095 4366 , Fax :+603-2095 3616

FARRER CONSULTING LTD

Heywood, Lancashire, Biwater Place, Gregge Street, OL10 2DX, England.

http://www.farrerconsulting.com Tel : +44-1706-626258; Fax : +44-1706-626294

RBC DESIGN CONSULTANT:

REI- iB ter Co nsor tium Sdn Bhd

P & I DIAGRAM OF KIM NGUU AND SET RIVER DEBRIS REMOVAL SYSTEM

F17074

YS/STP/DRG/IW/P&I/0001 C0

NTS GM

12/10/09 FW

Date REJECTED, REVISE AS INDICATED AND RESUBMIT

APPROVED, SUBJECT TO INCORPORATION OF COMMENTS APPROVED, SUBJECT TO AREA'S OF HOLD NOT FOR CONSTRUCTION, AS NOTED APPROVED, ISSUE FOR CONSTRUCTION CODE 2

For and on behalf of Approved by CODE 5 CODE 3

AS BUILT/CERTIFIED

CODE 1 APPROVAL STATUS

12/10/09

1.1.5 Intake Works Process Description

The Sewage Treatment Plant (STP) at Yen So Park receives flows from both the Kim Nguu and Set rivers Each river intake system is protected by a log boom and debris removal system to prevent any floating debris entering the inlet works

The trapped debris is directed towards a diversion channel mounted on the side of the riverbank The debris is removed by a mechanical 50mm screen which is cleared by a motor driven rake (M 01005,

M 01006) based on timer The debris is deposited into a skip via a screenings conveyor (M 01007, M 01008) The Kim Nguu debris removal area is connected to odour control unit 3 The Set debris removal area is connected to odour control unit 4 The debris removal systems are isolated by stop logs (V01009, V01010, V01011, and V01012)

The level in the river is maintained by two sets of 2 No radial weir gates mounted downstream of the log boom and a level transmitter (LT01003, LT01004) The radial weir gates are isolated by stop logs

1.1.6 Intake Works Control Philosophy

o AUTOMATIC CONTROLLED OPERATIONS

The raking mechanism (M 01005, M 01006) will be initiated based on timer The raking mechanism will continue to operate for a pre-set time (T3.1) and will then stop The raking mechanism is stopped when the screen is taken offline

When the raking arms are in operation, the arms rake the screenings trapped in front of the screen and convey them to the top of the screen The screenings is wipe off the arms and drop into a chute where they enter a trash conveyor The trash conveyor (M 01007, M 01008) starts and stops when the raking mechanism starts and stops The trash conveyor runs for a pre-set time (T3.3) after the raking mechanism has stopped

The river radial weir gates and the level transmitters (LT01003, LT01004) control the level of the river The level transmitters will indicate whether the radial gates need to be raised or closed to achieve level set point on the river level The level of the river can be found by the look tables shown below:

The level of the river is controlled by the river radial weir gates and the level transmitters (LT01003, LT01004) The level transmitters will indicate whether the radial gates need to be raised or closed to achieve level set point on the river level The level of the river can be found by tables shown below:

o MANUAL CONTROL MODE

A clean of the screen may be initiated manually from SCADA control

The level of the river is adjustable from SCADA control The level will be set at

commissioning stage

o HAND CONTROL MODE

Inch forward and inch reverse pushbuttons are provided for maintenance and inspection purposes and to remove blockages from the trash conveyor

o PLANT FAILURE ACTIONS

As detailed in section 1V, VIII

1.1.7 Trash Rake Equipment description, Operation, and Maintenance

1.1.7.1 Debris Removal System Trash rake

a) Description & Operation

Trash rake with stationery rake having a rake sliding on a bar screen measuring 5.2/5.9/6.73 m (Steel board included)

The wastes discharged using a shovel situated in the forearm extremity sweeping the bar screen penetrating between the bars with teeth

During this operation, the wastes are discharged in mechanical (belt conveyor) deposits them in a wastes bucket (skip)