Ruhr Oil GmbH is performing the civil construction of a wastewater treatment plant (WTP) at the Horst site of the 120,000BBL/d Gelsenkirchen Refinery, which is in Germany's North-Rhine Westphalia state.

Ruhr Oil GmbH is a 50:50 joint venture between Deutsche BP (Bochum, Germany) and Petróleos de Venezuela S.A. (PDVSA), Venezuela's state-owned oil company. In September, Gelsenwasser AG (Gelsenkirchen) and Hager + Elsässer GmbH (Stuttgart, Germany) signed an agreement for the design, supply, installation, and start-up operation of the new WTP.

The project is expected to be completed by the fourth quarter of 2010. The turnkey USD 30 million project consists of the construction of a new central wastewater treatment plant to process 700 cum per hour of production wastewater and rainwater. AWS GmbH (Gelsenkirchen), Gelsenwasser's subsidiary, will operate the plant for 15 years. The plant will perform multiple physical pre-purification processes and a complete biological clarification stage, as well as an energy-conserving and thermally regenerative exhaust treatment system.

For that task, Ruhr Oil GmbH selected Gelsenwasser AG, which holds the main contract for the erection and operation of the wastewater treatment plant. Gelsenwasser AG assigned the Germany-based company Hager + Elsässer GmbH for the construction of the plant.