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Process flow diagram

Keppel Seghers Engineering (Qatar Doha Office)

7th Floor Al Jassim Commercial Tower

C-Ring Road Suhaim Bin Hamad Street

PO Box 37069, Doha

State of Qatar

Tel: +974 44430 365

Fax: +974 44430 340

Email: i nfo_qatar@keppelseghers.com

Keppel Seghers Pte Ltd

1 HarbourFront Avenue

#05-05 Keppel Bay Tower

Singapore 098632

Tel: +65 6278 1800

Fax: +65 6278 0777

Email: info_singapore@keppelseghers.com

Website: www.keppelseghers.com

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Centralised air extraction system and odour treatment facilities using chemical scrubbersOdourControl

LiquidStream

SolidsStream

Excess Stormwater Overflow

High-gradereclaimed watersupply fornon-potableuse

Preliminary Treatment-Stepscreens

-Vortex degritters

Tertiary Treatment-Advanced membranefiltration

-Ultraviolet technologies

Pelletsto landfillorused as soil conditioners

SludgeTreatment-Dried sludgeof upto 90% solids minimises landfillvolume

-Dried sludgecan beused as soilconditioners

ThickeningCentrifuge

 AerobicDigestor

DewateringCentrifuge

Common StorageSilo

ThermalDryer

SludgeStorage

TSEBalancing

Tank

UVdisinfection

RO(future

provision)

UltraFiltration

GMFChlorineContactTank

Cl2 dosing

IncomingWastewater

FineScreen

GritSeparator Bioreactor

an ax ae

Return ActivatedSludge

IncomingSludge(from other SewageTreatmentWorks)

Surplus ActivatedSludge

Clarifier

Lagoons(for >14 days

storage)

StormwaterStorage

Secondary Treatment-Anaerobic-anoxic-aerobic

 process configuration

-Biological nutrientremoval

  Technical data 

Location Umm SalalMohammed

  Area 4km x 4km

  Capacity 439,000m3 /day (peak flow)

  TYPE OF PROCESS

  AREA UNIT OPERATION TECHNOLOGY

Preliminary Fine screens Step screens

  Grit separators Vortex degritters

  Secondary Biologicaltreatment Anaerobic - Anoxic - Aerobic

  Secondary clarifier Settling

  Tertiary Granular media filters Dualmedia filtration

  Membrane filtration Ultrafiltration

  Disinfection UV

  So li d t re at men t Sl ud ge di ges ti on A ero bi c d ige st io n

  Thickening and dewatering Centrifuge

  Wet sludge treatment Sludge drying

TYPICAL EFFLUENT QUALITY PLANT ODOUREMISSIONREQUIREMENT

  pH 6-9 H2S 10 ppb (at plant site boundary)

  TN < 10 mg / l Odour Unit (OU) 1.5 OU / m3 (at buffer zone boundary)

AmmoniacalNitrogen <1 mg / l

  TP <2 mg / l

  BOD5 <5 mg / l

  TSS 0.1 mg / l

  Turbidity 0.1 NTU

DRIEDSLUDGE STANDARD

  DrySolids Content 90% DS

  FaecalColiform Density <1000 MPN/ g.ds

  Salmonella sp Density <3 MPN/ 4g.ds

  Product Size 3-6 mm diameter

Keppel SeghersKeppel Seghers is a leading provider of

comprehensive environmental solutions,

and provides consultancy, design and

engineering, technology development,

construction, operation and maintenance

of plants and facilities, as well as investments

in large-scale environmental projects.

Keppel Seghers’ advanced technology solutions

address a wide spectrum of environmental

issues for both solid waste and water.

To date, Keppel Seghers has executed morethan 100 waste-to-energy projects and more

than 350 water and wastewater projects in

more than 25 countries worldwide.

Keppel Seghers is a wholly-owned subsidiary

of the Keppel Infrastructure group, which is

a division of Keppel Corporation Limited, a

leading company listed on the Singapore Exchange.

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Keppel Seghers, the environmental arm of

Keppel Infrastructure, is privileged to partner

the Public Works Authority of Qatar to develop

Doha North Sewage Treatment Works (Doha

North STW). This landmark project is the largest

greeneld wastewater treatment, water reuse

and sludge treatment plant in Qatar and the

Middle East.

With a peak design capacity to treat wastewater

of up to 439,000 cubic metres per day, Doha

North STW will serve a projected population of

over 900,000. This modern facility will feature

advanced biological treatment processes as well

as membrane and ultra-violet technologies to

produce high quality reclaimed water for reuse.

The facility will also be equipped with thermal

drying processes to treat wastewater sludge to

international standards for safe disposal.

Doha North Sewage Treatment Worksat a glance

Peak capacity of439,000 cubicmetres per day

Serves a populationof over 900,000

Keppel Seghers will design and build Doha North

STW, and subsequently operate the works for a

period of 10 years.

Doha North STW achieves several “rsts”:

• rst wastewater treatment facility in Qatar

to use advanced membrane and ultraviolet

treatment technologies to reclaim high quality

water for non-potable purposes;

• rst facility with a comprehensive odour

control system to minimise the impact on

the surrounding environment;

• rst facility equipped with modern sludge

treatment processes to receive and treat

sludge generated from not just Doha North

STW but all other sewage treatment works

in Qatar;

• the 4km-by-4km buer zone surrounding

Doha North STW will be carefully landscaped.

First of its kind

Doha North SewageTreatment Works 

Qatar 

The wastewater at Doha North Sewage Treatment Works undergoes advanced biological treatment before membrane andultra-violet treatment to produce high quality reclaimed water.