Trawniki Wastewater Treatment Plant, Trawniki-Kolonia, Poland

The Trawniki wastewater treatment plant is located in Trawniki-Kolonia, within the gmina Trawniki in województwo lubelskie, Poland. This facility serves a small agglomeration of 1,068 residents, reflecting the rural character of the region. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. The designed capacity is 2,000 m³/day, and the current discharge volume is 152.28 m³/day, indicating ample reserve capacity. The treated effluent is discharged into local watercourses that ultimately drain into the Wieprz River, a tributary of the Vistula River, which flows into the Baltic Sea. The plant plays a key role in protecting the local watershed and downstream aquatic ecosystems from nutrient pollution.

The plant discharges into the Wieprz River basin, which feeds into the Vistula River and eventually the Baltic Sea. The Baltic Sea is sensitive to eutrophication from nitrogen and phosphorus, making effective wastewater treatment critical. The surrounding Lubelskie region is characterized by agricultural land use, which can contribute diffuse nutrient loads; the plant's secondary treatment helps mitigate point-source pollution.