Project: Improving the efficiency of the wastewater treatment plant
In 2018, the Taskila wastewater treatment plant was expanded by an MBR membrane filter plant to enhance nitrogen removal. As part of the plant, KSB's Sewatec pumps were selected as recovery sludge pumps that pump activated sludge into the aeration tank. By keeping the activated sludge at a certain concentration, the nitrogen removal in the aeration tank is improved.
Customer: Oulun Vesi
Oulun Vesi is the municipal enterprise whose task is to provide water supply, sewage disposal and sewage treatment services to local residents and businesses of the city of Oulu in Northern Finland. Oulun Vesi has two wastewater treatment plants. The majority of wastewater is treated at the Taskila treatment plant, which is the largest wastewater treatment plant in Northern Finland. The wastewater of the neighboring municipalities Muhos, Utajärvi and Ii is also treated in Taskila. In 2019, approximately 17.8 million cubic meters of municipal wastewater was treated at the Taskila wastewater treatment plant. About 30% of the incoming wastewater was treated in the new MBR membrane filter plant.
Challenge: Pumping energy-efficiently and minimizing the risk of clogging
An important selection criterion for the pumps was energy efficiency, low life cycle costs and the lowest possible risk of clogging.
Solution: Sewatec pumps with D-impellers
KSB Finland offered six Sewatec pumps with D-impellers. i.e. with open diagonal single-vane impellers, because this impeller type preserves the structure of the activated sludge much better compared to other types of impellers.
All pumps are running at the Taskila plant in Oulu and Oulun Vesi has been satisfied with pumps’ operation.
Location: Oulu, Finland
Products used: 6 pcs Sewatec pumps