BEKKELAGET Sewage Treatment Plant Sludge Treatment Project in Oslo, Norway

Bekkelaget Sewage Treatment Plant is located in Oslo Fjord area, Norway. It is the second largest wastewater treatment plant in Norway, designed for 350,000 PE in the Oslo region and treating 120,000 tons of sewage per day. The sewage sludge is anaerobic treated at this plant. Digestion is carried out in two digesters with a total volume of 8,000 m³. The anaerobic digestate is used as fertilizer in surrounding farms, and the biogas produced is upgraded and used as vehicle fuel for urban buses.

As a turnkey contractor, Purac provided services such as process design, civil engineering, equipment supply, installation, commissioning and process guarantee, and has been contracting the operation to this day. The sewage treatment plant and part of the sludge treatment facilities of the project are built in rock caves, while the administrative building, factory, gas storage tanks and chemical warehouses are located outdoors outside the cave plant area. Therefore, high demands are placed on the coordination of the project's economy and environment, as well as the optimal configuration of the system.

This project help improves the environmental quality along the Oslo Fjord and played an important role in protecting the ecological environment of the Oslo Fjord.