Bysław Wastewater Treatment Plant, Teolog, Poland

The Bysław wastewater treatment plant is located in Teolog, a village in the Kuyavian-Pomeranian Voivodeship of Poland. It serves a population of approximately 4,049 people, placing it in the small-to-medium agglomeration category 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 agglomerations of this size. With a designed capacity of 5,200 m³/day and a current discharge volume of 577.32 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variability. The treated effluent is discharged into local watercourses that ultimately drain into the Baltic Sea via the Vistula River basin. The plant plays a key role in protecting the region's surface waters from nutrient pollution, supporting both local ecosystems and the broader environmental health of the Baltic Sea.

The Bysław plant discharges into small streams that feed into the Brda River, a tributary of the Vistula. The Vistula flows northward into the Baltic Sea, a semi-enclosed sea sensitive to eutrophication from nutrient inputs. The plant's secondary treatment helps reduce organic pollutants and nutrients, contributing to the protection of downstream aquatic habitats and the Baltic's ecological balance.