Haga Avloppsreningsverk Surahammar - Advanced Wastewater Treatment in Västmanland, Sweden

Haga Avloppsreningsverk is a municipal wastewater treatment plant located in Surahammar, Västmanlands län, Sweden. The plant serves a population of approximately 4,312 residents, classifying it as a small to medium agglomeration under Swedish and EU regulations. Its advanced treatment level ensures high-quality effluent suitable for discharge into sensitive environments. The plant operates with a designed capacity of 9,500 cubic meters per day and currently treats an average daily flow of 676.90 cubic meters, indicating significant spare capacity. As a Swedish facility, it adheres to the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations over 2,000 population equivalent and tertiary treatment in sensitive areas. The advanced treatment likely includes nutrient removal to protect downstream water bodies. The treated effluent is discharged into the local watershed, which ultimately drains into the Baltic Sea via the Kolbäcksån river system and Lake Mälaren. The Baltic Sea is a brackish water body sensitive to eutrophication, making nutrient removal critical. The plant's location within 50 km of the coast underscores its role in protecting this ecologically significant marine environment.

The plant discharges into the Kolbäcksån river system, which flows into Lake Mälaren, Sweden's third-largest lake, and eventually reaches the Baltic Sea. The Baltic Sea is a semi-enclosed brackish sea highly sensitive to nutrient pollution, where excess nitrogen and phosphorus cause algal blooms and oxygen depletion. Advanced treatment at this plant helps mitigate eutrophication risks in this ecologically fragile water body.