Bieliny Wastewater Treatment Plant - Secondary Treatment in Świętokrzyskie, Poland

The Bieliny wastewater treatment plant is located in the village of Bieliny, within the gmina of Bieliny in powiat kielecki, województwo świętokrzyskie, Poland. It serves a population of approximately 2,970, classifying it as a small agglomeration under Polish and EU regulations. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size discharging into freshwater. The plant's designed capacity is 6,715 m³/day, and it currently discharges 423.48 m³/day of treated wastewater, indicating significant spare capacity. The treated effluent is discharged into local watercourses that eventually drain into the Vistula River basin, which flows northward to 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 Vistula catchment.

The plant discharges into small streams within the Vistula River basin, which ultimately flows into the Baltic Sea. The region is characterized by agricultural land use and karst geology, making groundwater and surface water particularly sensitive to nutrient loading. The secondary treatment provided helps reduce organic matter and suspended solids, but without tertiary nutrient removal, some nitrogen and phosphorus may still reach downstream waters, contributing to eutrophication risks in the Baltic Sea.