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).
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.