Książ Wielkopolski Wastewater Treatment Plant - Secondary Treatment, Warta Basin

The Książ Wielkopolski wastewater treatment plant is located in the town of Książ Wielkopolski, within the powiat śremski of województwo wielkopolskie, Poland. It serves a population of 2,877, classifying it as a small agglomeration under Polish and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The facility has a designed capacity of 3,940 m³/day and currently treats an average daily flow of 410.22 m³/day, indicating significant spare capacity. Treated effluent is discharged into local surface waters, which ultimately drain into the Warta River basin, a major tributary of the Oder River. The Oder flows into the Baltic Sea, making this plant part of a larger transboundary water system that supports diverse aquatic ecosystems and is subject to international cooperation under the Oder River Basin management plans.

The plant discharges into the Warta River catchment, which flows into the Oder River and then to the Baltic Sea. This watershed supports diverse aquatic life, including fish species such as pike and perch, and is an important ecological corridor in western Poland. The region's agricultural landscape means nutrient removal is critical to prevent eutrophication downstream.