Oczyszczalnia sciekow w Krosnie - Wastewater Treatment Plant in Krosno, Poland

Oczyszczalnia sciekow w Krosnie is a municipal wastewater treatment plant located in Krosnie, a city in the Podkarpackie Voivodeship of southeastern Poland. Serving an estimated population of 87,145, the plant is classified as a medium agglomeration under EU regulations, which require secondary treatment as a minimum standard. As a facility in Poland, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary biological treatment for agglomerations of this size. For plants serving between 10,000 and 150,000 population equivalent, the directive requires compliance with effluent quality standards for biochemical oxygen demand, chemical oxygen demand, and suspended solids. The plant's treatment process is designed to meet these regulatory requirements, ensuring that discharged water meets environmental quality standards. The treated effluent from the plant is discharged into the local water system, which ultimately drains into the Wisłok River, a tributary of the San River, and then into the Vistula River before reaching the Baltic Sea. This downstream chain highlights the plant's role in protecting the Vistula basin and the Baltic Sea from nutrient pollution, which is a key environmental concern in the region.

The plant discharges into the Wisłok River, which flows into the San River, a major tributary of the Vistula River. The Vistula basin is ecologically significant, supporting diverse aquatic life and providing habitat for migratory fish species. The Baltic Sea, as the ultimate receiving water body, is sensitive to nutrient enrichment, making effective wastewater treatment crucial for reducing eutrophication risks.