OS w Szczyglowicach Wastewater Treatment Plant, Knurów, Silesian Voivodeship

OS w Szczyglowicach is a secondary wastewater treatment plant located in the Szczyglowice district of Knurów, in the Silesian Voivodeship of southern Poland. The plant serves a population of 4,260 and is part of the municipal wastewater infrastructure for the Knurów area, a city within the Górnośląsko-Zagłębiowska Metropolia (Upper Silesian-Zagłębie Metropolis). The plant provides secondary treatment, which typically involves biological processes to remove organic matter and suspended solids. With a designed capacity of 8,200 m³/day and an actual discharge volume of 607.41 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. As a Polish facility, it operates under national regulations that transpose the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size (2,000-10,000 population equivalent). The treated effluent is discharged into local watercourses that ultimately drain into the Oder River basin, which flows northward to the Baltic Sea. The plant's operation helps protect the local watershed from untreated sewage, supporting water quality in the region's rivers and contributing to the ecological health of the Baltic Sea catchment area.

The plant discharges into the local drainage network within the Oder River basin, which flows through southwestern Poland and into the Baltic Sea via the Szczecin Lagoon. The region is part of the Upper Silesian industrial area, where water quality is influenced by both municipal and industrial discharges. Secondary treatment reduces organic pollutants and suspended solids, helping to maintain the ecological balance of receiving streams and supporting downstream aquatic life in the Oder River system.