UNISLAW Wastewater Treatment Plant, Raciniewo, Poland

The UNISLAW wastewater treatment plant is located in Raciniewo, within the gmina Unisław in the kujawsko-pomorskie province of Poland. It serves a population of approximately 2,505 people, 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 discharges into freshwater and estuaries from agglomerations of this size. The plant's designed capacity is 6,070 m³/day, with an actual discharge volume of 357.17 m³/day, indicating significant spare capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin and then into the Baltic Sea. The plant plays a key role in protecting the region's surface waters from nutrient pollution and supporting the ecological health of the downstream aquatic environment.

The plant discharges into the Vistula River basin, which flows northward into the Baltic Sea. The region's watershed supports diverse aquatic life and is part of a larger ecosystem that includes coastal lagoons and wetlands. Effective wastewater treatment is critical to prevent eutrophication in the Baltic Sea, a semi-enclosed sea sensitive to nutrient inputs.