Kazimierz Biskupi Wastewater Treatment Plant, Osiecza Pierwsza, Wielkopolskie, Poland

The Kazimierz Biskupi wastewater treatment plant is located in Osiecza Pierwsza, within the gmina Rzgów of koniński powiat in województwo wielkopolskie, Poland. It serves a population of 4,304 and has a designed capacity of 13,500 m³/day, indicating it is sized to accommodate future growth or seasonal variations. The plant provides secondary treatment, which is the standard biological treatment required under 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, ensuring compliance with EU effluent standards before discharge. The treated effluent is discharged into local watercourses that ultimately drain into the Warta River basin, a major tributary of the Oder River. The Oder flows into the Baltic Sea, making the plant's operations important for protecting downstream aquatic ecosystems and the sensitive Baltic marine environment.

The plant discharges into local streams that feed into the Warta River, a key tributary of the Oder River. The Oder basin supports diverse aquatic life and is an important migratory corridor for fish species. The Baltic Sea, as the final receiving water body, is sensitive to nutrient pollution, making effective wastewater treatment crucial for preventing eutrophication and maintaining ecological balance.