Success Story

Construction and operation of large scale wastewater treatment plant for a population of 2 million in Ambarli, Turkey

Istanbul Su ve Kanalizasyon Idaresi (ISKI), Istanbul, Turkey
Turnkey erection of a wastewater treatment plant Installation of process control technology, Turnkey design, engineering and programming including instrumentation, control and automation (ICA) and mechanical engineering, 5 years operation

Project Presentation

The Istanbul metropolitan municipality, with its 18 million inhabitants, is committed to resolving its pollution challenges in order to protect the Marmara Sea from further contamination. To solve this problem, the Istanbul Water and Sewerage Administration (ISKI) awarded the contract to a consortium, led by PWT, for a turnkey construction of one of the largest and most modern wastewater treatment plants in Europe.

Planning, turnkey construction and five-year operation of a wastewater treatment plant in Istanbul

The turnkey plant built by the consortium includes full biological treatment of the sewage with biological phosphorous removal and extended nitrogen removal. At the first stage, the plant is sized for a population equivalent of 2 million and treats 400,000 m³ of sewage per day.

A future extension has already been considered in the design of the plant.
The treated effluent is discharged into the Marmara Sea. Primary and surplus sludge is digested, mechanically dewatered and dried up to 95 %. Biogas from the sludge digestion is co-generated in turbines respectively used for heating purposes. The biogas produced during digestion is converted into electricity via gas turbines or used for heating purposes. The investment volume of the entire plant amounted to 118 million euros.

Pumping station
Energy production from biogas
Mechanical pretreatment
Anaerobic sludge stabilisation
Mechanical sludge treatment

Waste Water Treatment Plant Ambali, Turkey


The design and construction of a  WWTP permit:

  • A future expansion of the treatment capacity
  • The implementation of anaerobic sludge digestion, biogas heat and power generation
  • Biological phoshorous and nitrogen removal
  • Mechanical dewatering in the drying plant
  • Advanced exhaust air purification using ozone
  • Process water production with ultrafiltration

Technical data

Plant size
2,000,000 PE
Population equivalent:
Raw water intake
400.000 m3/d
Daily inflow Qd
21.700 m3/h
Dry weather flow Qt
46.800 m3/h
Combined sewage inflow Qm
120 t/d
240 t/d
200 t/d
24 t/d
3.2 t/d
Effluent Discharge Criteria
25 mg/l
125 mg/l
35 mg/l
10 mg/l
35 mg/l
35 mg/l
Waste Water Quantity
400.000 m3/d
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