Jamno Wastewater Treatment Plant, Koszalin, Poland

Jamno is a former wastewater treatment plant located in Koszalin, in the West Pomeranian Voivodeship of Poland. The plant served a population of approximately 230,000, classifying it as a large agglomeration under Polish and EU regulations. The facility is now closed, and its operational history reflects the region's wastewater management infrastructure. As a large agglomeration, the plant would have been subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment or more stringent treatment for discharges to sensitive areas. The designed capacity of the plant was 1.00 (likely in thousands of cubic meters per day), indicating a substantial facility. The closure suggests that wastewater treatment for Koszalin has been consolidated or upgraded elsewhere. The plant is located near the Baltic Sea coast, within 50 km of the shoreline. The area drains into the Baltic Sea via rivers such as the Dzierżęcinka or other coastal streams. The Baltic Sea is a sensitive marine environment, and discharges from large agglomerations require careful management to prevent eutrophication and protect aquatic life.

The plant is situated in the coastal region of West Pomerania, with drainage likely flowing into the Baltic Sea via local rivers such as the Dzierżęcinka or directly through coastal outfalls. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it vulnerable to nutrient pollution. Discharges from large agglomerations like Koszalin must meet stringent standards to protect marine ecosystems, including reducing nitrogen and phosphorus loads that can cause algal blooms and hypoxia.