Miejska Oczyszczalnia Sciekow w Sulejowie - Municipal Wastewater Treatment Plant in Sulejów, Poland

Miejska Oczyszczalnia Sciekow w Sulejowie is a municipal wastewater treatment plant located in Sulejów, in the łódzkie voivodeship of central Poland. It serves a population of around 10,682, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant is situated near the Pilica River, a key watercourse in the region. Under the EU UWWTD, agglomerations of this scale are required to provide secondary treatment (biological treatment) as a minimum standard. Polish national regulations transpose these requirements, and the plant is expected to meet effluent quality standards for biochemical oxygen demand, chemical oxygen demand, and suspended solids. Typical facilities of this size employ activated sludge or similar biological processes. The plant discharges treated wastewater into the Pilica River, which flows northward to join the Vistula River near Warsaw. The Vistula ultimately drains into the Baltic Sea. The Pilica River supports diverse aquatic life and is an important ecological corridor in central Poland. The plant's operations contribute to protecting water quality in this river system and the downstream Baltic Sea environment.

The plant discharges into the Pilica River, a tributary of the Vistula River, which flows into the Baltic Sea. The Pilica River supports diverse aquatic ecosystems, including fish species such as barbel and chub, and provides habitat for waterbirds. The surrounding area includes forested and agricultural land, making the river important for both biodiversity and local water resources.