Tolkmicko Wastewater Treatment Plant: Coastal Secondary Treatment in warmińsko-mazurskie, Poland

The Tolkmicko wastewater treatment plant is located in the town of Tolkmicko, in the warmińsko-mazurskie province of northern Poland. It serves a population of approximately 4,822 residents, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated near the Baltic Sea coast, within 10 km of the shoreline. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into coastal waters. Its designed capacity is 8,250 m³/day, and it currently treats an average of 687.54 m³/day, indicating significant spare capacity. The plant operates under Polish national regulations that implement EU directives, with permits issued by the regional water authority. Treated effluent from the plant is discharged into local watercourses that flow into the Baltic Sea, specifically the Vistula Lagoon or directly into the Gulf of Gdańsk. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. The plant's secondary treatment helps reduce organic load and nutrients, protecting the coastal ecosystem and supporting biodiversity in the region.

The plant discharges into the Baltic Sea basin, likely via the Vistula Lagoon or nearby coastal streams. The Baltic Sea is a sensitive brackish environment with slow water renewal, making it vulnerable to eutrophication from nutrient inputs. The plant's secondary treatment reduces biochemical oxygen demand and suspended solids, but nutrient removal may be limited unless tertiary treatment is applied. The coastal zone supports diverse aquatic life and is an important area for migratory birds and fish species.