Oczyszczalnia Ścieków w Kołaczkowie - Secondary Wastewater Treatment in Wielkopolskie, Poland

Oczyszczalnia Ścieków w Kołaczkowie is a municipal wastewater treatment plant located in Kołaczkowo, a village in the Wielkopolskie region of Poland. The plant serves a population of 1,210, classifying it as a small agglomeration under Polish and EU regulations. It operates with a designed capacity of 2,300 m³/day and currently treats an average daily flow of 172.53 m³/day. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. As a small plant in an inland area, it is not subject to more stringent tertiary treatment requirements unless the receiving water body is designated as sensitive. The treated effluent is discharged into local watercourses that ultimately drain into the Warta River basin, a major tributary of the Oder River, which flows into the Baltic Sea. The plant plays a key role in protecting local surface water quality and supporting the ecological health of the region's rivers and streams.

The plant discharges into the Warta River basin, which flows through central Poland and joins the Oder River near the German border. The Oder then empties into the Baltic Sea via the Szczecin Lagoon. The local watershed supports diverse aquatic life and is important for migratory fish species. The region's agricultural landscape means nutrient removal is critical to prevent eutrophication in downstream waters.