TP 904 of Uudenkaupungin kt Wastewater Treatment Plant, Uusikaupunki, Finland

TP 904 of Uudenkaupungin kt is a municipal wastewater treatment plant located in Uusikaupunki, a town in the Varsinais-Suomi region of southwestern Finland. The plant serves a population of approximately 31,000 people, placing it in the medium agglomeration category under Finnish and EU regulations. As a Finnish wastewater treatment facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are sensitive to eutrophication. The plant's designed capacity is 1.00 (likely in thousand cubic meters per day or similar units), indicating its scale. The treated effluent from the plant is discharged into the local watershed, which ultimately drains into the Archipelago Sea, part of the Baltic Sea. The Baltic Sea is a brackish water body with limited water exchange, making it sensitive to nutrient pollution. The plant's operations contribute to protecting the coastal and marine environment from excessive nutrient loads.

The plant discharges into the local watershed that flows into the Archipelago Sea, a part of the Baltic Sea. The Baltic Sea is a semi-enclosed, brackish sea with limited water exchange, making it highly sensitive to eutrophication from nutrient inputs. The region supports diverse aquatic life and is an important area for fish spawning and migratory birds. Protecting this environment requires effective wastewater treatment to reduce nitrogen and phosphorus loads.