Boras avloppsreningsverk Gasslosa, Borås

Overview

Boras avloppsreningsverk Gasslosa is a municipal wastewater treatment plant serving Borås, Sweden. It handles a population equivalent of approximately 110,000 under the EU Urban Waste Water Treatment Directive.

Boras avloppsreningsverk Gasslosa is a municipal wastewater treatment facility located in Borås, Västra Götaland County, Sweden. The plant serves a population equivalent of approximately 110,000, classifying it as a large 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 discharges to freshwater and estuaries. For agglomerations of this scale, the directive also mandates more advanced treatment if the receiving waters are sensitive to eutrophication. The plant's treated effluent is discharged into the local water system, which ultimately drains into the Kattegat via the Viskan River. This river supports diverse aquatic life and is an important migratory corridor for fish species. Proper treatment helps protect the downstream marine environment from nutrient pollution.

Environmental context

The plant discharges into the Viskan River basin, which flows through southwestern Sweden into the Kattegat, a marginal sea of the North Atlantic. The Kattegat is ecologically sensitive, supporting diverse marine life and important fisheries. Nutrient loading from wastewater can contribute to algal blooms and oxygen depletion, making advanced treatment crucial for protecting this coastal ecosystem.

Frequently asked questions

The plant is located at Gässlösavägen in Borås, Västra Götaland County, Sweden.

The plant serves a population equivalent of approximately 110,000, classifying it as a large agglomeration under EU regulations.

The treated effluent is discharged into the local water system, which flows into the Viskan River and eventually reaches the Kattegat.

As a Swedish plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which sets treatment standards based on population size and receiving water sensitivity.

Under the EU UWWTD, plants serving over 100,000 people in sensitive areas require tertiary treatment to remove nutrients like nitrogen and phosphorus. Even in non-sensitive areas, secondary treatment is mandatory.