Success Story

Design, construction and operation of a turnkey wastewater treatment plant - Eskişehir, Turkey

Client
General Directorate of Eskişehir Water and Sewerage Administration (ESKI), Turkey
Project
Design and construction of a turnkey wastewater treatment plant
Status
08/2010
Completed

Design, Construction and operation

The population of the city of Eskişehir is currently 520,000. The first stage of the municipal wastewater treatment plant (WWTP) was completed in 1999 for a capacity of 234,000 PE (population equivalent). This is too small and designed only for the removal of BOD (biochemical oxygen demand) and suspended solids. Quite apart from its inadequate capacity, it thus failed to meet the effluent discharge criteria of the EU directive. Under the leadership of PWT, the PWT/Alke consortium extended and modernised the wastewater treatment plant (WWTP) on behalf of the Eskişehir Water and Sewerage Administration (ESKI).

PWT Solution

On completion of the extension, the WWTP now has a capacity of 650,000 PE. The extension of the plant is designed for the removal of nitrogen and phosphorus and fully meets the effluent discharge criteria of Directive 91/271/EEC.

The contract awarded to the consortium also includes the turnkey construction of a complete sludge treatment plant by anaerobic digestion and heat and power cogeneration from the biogas produced. The electricity generated covers the complete electrical energy consumption of the whole wastewater treatment plant. Therefore, the extension and modernization of the plant represents not only a major step in the reduction of the discharge of pollutants into the water courses, but also a significant improvement in the economics of the operation of the plant. Operation of the plant until smooth operation and handover to the operator.

Pumping station
Energy production from biogas
Mechanical pretreatment
Anaerobic sludge stabilisation

Scheme Sewage treatment plant Eskişehir

Advantages

The design and construction of the wastewater treatment plant facilitates a:

  • Reduction of the discharge of pollutants into the water courses.
  • Significant improvement in the economics of the operation of the plant.

The conversion of the resulting biogas into electricity enables:

  • Compliance with EU limit values
  • Nearly self-sufficient operation of the WWTP through biogas conversion into electricity
  • Economical operation due to the resulting savings in electricity

Technical data

Plant size
650,000 PE
Population equivalent:
Raw water intake
765,000 m3/d
Daily inflow Qd
8,000 m3/h
Peak dry weather flow Qt
8,000 m3/h
Peak wet weather flow Qm
Incoming freight
40.5 t/d
BOD5
111 t/d
COD
47 t/d
TS
6.2 t/d
TKN
1.7 t/d
Ptot
Effluent Discharge Criteria
25 mg/l
BOD5
90 mg/l
COD
25 mg/l
TS
10 mg/l
TN
1 mg/l
Ptot
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