Orle Wastewater Treatment Plant | Orle, Poland | Secondary Treatment

The Orle wastewater treatment plant is located in Orle, a village in the Pomeranian Voivodeship of northern Poland. Serving a population of 730, this facility is part of the municipal infrastructure managed by the local gmina (Liniewo). The plant provides secondary treatment, which is the standard biological treatment required for small agglomerations under Polish and EU regulations. With a designed capacity of 4,990 cubic meters per day, the plant treats an average daily flow of 104.09 cubic meters, indicating significant reserve capacity. As a facility in Poland, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for all agglomerations above 2,000 population equivalent. For smaller communities like Orle, appropriate treatment is still required to protect local water quality. The treated effluent is discharged into a local watercourse that eventually drains into the Baltic Sea via the Vistula River basin. The region's lakes and rivers support diverse aquatic life and are important for recreation and fishing. Proper wastewater treatment helps maintain the ecological health of these water bodies and the downstream Baltic Sea ecosystem.

The plant discharges into a small stream that flows into the Wierzyca River, a tributary of the Vistula River, which ultimately reaches the Baltic Sea. The local watershed includes numerous lakes and wetlands that support diverse aquatic species and migratory birds. The Baltic Sea is a semi-enclosed sea sensitive to nutrient pollution, making effective nutrient removal in wastewater treatment crucial for preventing eutrophication.