Knivsta avloppsreningsverk - Knivsta Municipal Wastewater Treatment Plant, Sweden

Knivsta avloppsreningsverk is a municipal wastewater treatment plant located in Knivsta, Uppsala County, Sweden. The plant serves a population of approximately 11,088, classifying it as a medium-sized agglomeration under EU regulations. As a Swedish 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 thousands of cubic meters per day or similar unit), indicating its scale. The treated effluent from the plant is discharged into local water bodies that ultimately drain into the Baltic Sea. The plant plays a crucial role in protecting downstream aquatic ecosystems and the Baltic Sea from nutrient pollution and other contaminants. Its operation supports Sweden's commitment to reducing eutrophication in the Baltic Sea region.

The plant discharges into local streams that flow into the Baltic Sea via the Norrström drainage basin. The Baltic Sea is a semi-enclosed brackish sea highly sensitive to nutrient inputs, which can cause algal blooms and hypoxia. The plant's treatment helps mitigate eutrophication in this ecologically important water body, which supports diverse marine life and is a critical migratory corridor for fish and birds.