Rzgow Wastewater Treatment Plant, Biskupice, Poland

The Rzgow wastewater treatment plant is located in Biskupice, within the gmina Grodziec in the wielkopolskie province of Poland. It serves a small agglomeration of 1,330 people, reflecting the rural character of the area. The plant is part of Poland's municipal wastewater infrastructure, which operates under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the minimum standard required under the EU directive for discharges into freshwater bodies from agglomerations of this size. Its designed capacity of 1,300 m³/day and current discharge volume of 189.64 m³/day indicate that the plant operates well below its capacity, allowing room for future growth or seasonal variations. 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 performance relevant to the ecological health of the Baltic Sea region. Proper treatment helps reduce nutrient loads and protect downstream aquatic ecosystems.

The plant discharges into local streams that feed into the Warta River, a key tributary of the Oder River. The Oder flows into the Baltic Sea, a semi-enclosed sea sensitive to eutrophication from nutrient pollution. The plant's secondary treatment helps reduce organic load and nutrients, supporting the ecological balance of the downstream water bodies and the Baltic Sea.