SUPERBOS w Rybnej Wastewater Treatment Plant, Jeziorowice, Poland

SUPERBOS w Rybnej is a municipal wastewater treatment plant located in Jeziorowice, within the gmina Żarnowiec in województwo śląskie, Poland. The plant serves a population of around 6,482 and has a designed capacity of 12,000 m³/day, with an average discharge volume of 924.23 m³/day. 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. Under this directive, secondary treatment is mandatory for populations above 2,000, and the plant's capacity suggests it can accommodate future growth. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows 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 downstream aquatic habitats.

The plant discharges into the Vistula River basin, which flows northward through Poland and empties into the Baltic Sea. This watershed supports diverse aquatic life and is an important migratory corridor for fish species. The secondary treatment process helps reduce organic load and nutrients, mitigating eutrophication risks in the Baltic Sea.