Nowy Korczyn Wastewater Treatment Plant, Grotniki Duże, Poland

The Nowy Korczyn wastewater treatment plant is located in Grotniki Duże, within the gmina of Nowy Korczyn in the świętokrzyskie province of Poland. It serves a small population of 326 residents, reflecting its role in a rural community. The plant provides secondary treatment, which is the standard level required under Polish regulations for small agglomerations. As a secondary treatment facility, the plant uses biological processes to reduce organic matter and suspended solids. Its designed capacity of 3,439 m³/day is significantly larger than the current discharge volume of 46.48 m³/day, indicating ample headroom for future growth or seasonal variations. The plant operates under Poland's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for all agglomerations above 2,000 population equivalent, though smaller plants like this one are also expected to meet appropriate standards. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward to the Baltic Sea. The plant's operation helps protect the region's surface waters from nutrient pollution and supports the ecological health of the downstream aquatic environment.

The plant discharges into the local catchment of the Nida River, a tributary of the Vistula River. The Vistula flows through central Poland and empties into the Baltic Sea via the Gdańsk Bay. The downstream waters support diverse aquatic life and are part of an important migratory corridor for fish species. The plant's secondary treatment reduces organic load and nutrients, helping to prevent eutrophication in the Baltic Sea.