Dobrzany Wastewater Treatment Plant, Mogilica | Secondary Treatment, Poland

The Dobrzany wastewater treatment plant is located in Mogilica, a village in the West Pomeranian Voivodeship of northwestern Poland. It serves a population of 3,156 people, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from the Baltic coast, and treats municipal wastewater from the local community. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 1,900 m³/day and an actual discharge volume of 450 m³/day, the facility operates well below its capacity, indicating room for future growth. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local watercourses that eventually drain into the Oder River basin and then into the Baltic Sea. The plant plays a key role in protecting the region's surface waters from nutrient pollution, supporting aquatic life and downstream ecosystems. Its operation is subject to Polish environmental permits aligned with EU directives.

The Dobrzany plant discharges into small streams that flow into the Ina River, a tributary of the Oder River. The Oder River drains into the Szczecin Lagoon and then the Baltic Sea. This watershed supports diverse aquatic habitats and is ecologically sensitive to nutrient inputs. The plant's secondary treatment helps reduce organic and nutrient loads, protecting downstream water quality in the Baltic Sea catchment.