Balsta Avloppsreningsverk - Råby Wastewater Treatment Plant, Sweden

Balsta Avloppsreningsverk is a municipal wastewater treatment plant located in Råby, Håbo kommun, Uppsala län, Sweden. It serves a population of approximately 30,437, classifying it as a medium-sized agglomeration under EU regulations. As a Swedish plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day or similar unit), indicating its scale. The plant's treated effluent is discharged into the local watershed, which ultimately drains into Lake Mälaren, Sweden's third-largest lake. Lake Mälaren is a vital freshwater resource and supports diverse aquatic life, including several fish species. The plant plays a key role in protecting this important water body from nutrient pollution.

The plant discharges into the local drainage network that flows into Lake Mälaren, a large freshwater lake that eventually connects to the Baltic Sea via Stockholm. Lake Mälaren provides drinking water for over two million people and supports a rich ecosystem, including pike, perch, and migratory fish. The plant's treatment helps control nutrient loads that could otherwise contribute to eutrophication in the lake and the Baltic Sea.