TP 906 of Vaasan kt Wastewater Treatment Plant, Vaasa, Finland

TP 906 of Vaasan kt is a municipal wastewater treatment plant located in Vaasa, a city on the west coast of Finland in the region of Österbotten. The plant serves a population of approximately 81,000, classifying it as a medium-to-large agglomeration under Finnish and EU regulations. As a Finnish plant, TP 906 operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Finland also enforces national standards for nutrient removal, particularly in sensitive coastal areas like the Gulf of Bothnia. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the local wastewater load. The treated effluent from TP 906 is discharged into the Gulf of Bothnia, a brackish sea that is part of the Baltic Sea. The Baltic Sea is highly sensitive to eutrophication from nutrient inputs, making effective wastewater treatment critical for protecting marine ecosystems. The plant's location within 50 km of the coast underscores its role in safeguarding coastal water quality.

The plant discharges into the Gulf of Bothnia, a northern extension of the Baltic Sea. This brackish water body is ecologically sensitive due to limited water exchange and high nutrient loads, which can lead to algal blooms and oxygen depletion. The surrounding coastal waters support diverse aquatic life, including fish species like herring and perch, and serve as important migratory routes for seabirds. Effective treatment at TP 906 helps reduce nutrient inputs that contribute to eutrophication in the Baltic Sea.