Overview
Bollnas ARV is a municipal wastewater treatment plant serving Bollnäs, Sweden. It treats wastewater from approximately 22,800 people under Sweden's implementation of the EU Urban Waste Water Treatment Directive.
Bollnas ARV is a municipal wastewater treatment plant located in Bollnäs, Gävleborgs län, Sweden. The facility serves a population of approximately 22,800, classifying it as a medium-sized agglomeration under EU regulations. The plant is situated inland, more than 50 km from the coast, and discharges into the local watershed. As a Swedish plant, Bollnas ARV operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. Sweden has implemented the directive through national legislation, and plants serving over 10,000 people must meet strict effluent standards. The treated effluent from Bollnas ARV is discharged into the local river system, which ultimately drains into the Baltic Sea via the Ljusnan River. The Baltic Sea is a sensitive marine environment with eutrophication concerns, making nutrient removal important. The plant's location inland helps protect coastal waters from direct pollution, but its discharge contributes to the overall nutrient load in the watershed.
Environmental context
Bollnas ARV discharges into the Ljusnan River, which flows southeast through Gävleborgs län and empties into the Baltic Sea near Söderhamn. The Baltic Sea is a brackish inland sea with limited water exchange, making it vulnerable to nutrient pollution. The Ljusnan River supports diverse aquatic life and is an important migratory corridor for fish species. The plant's nutrient removal performance is critical for reducing eutrophication risks in the downstream coastal zone.
Frequently asked questions
Bollnas ARV is located in Vik, Bollnäs, in Bollnäs kommun, Gävleborgs län, Sweden. The plant serves the city of Bollnäs and surrounding areas.
Bollnas ARV serves approximately 22,800 people, classifying it as a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive.
The treated wastewater from Bollnas ARV is discharged into the Ljusnan River, which flows into the Baltic Sea. The plant is located more than 50 km from the coast, so discharge is to inland freshwater.
Bollnas ARV operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), transposed into Swedish law. For agglomerations of this size, secondary treatment is required, with additional nutrient removal in sensitive areas like the Baltic Sea catchment.
In Sweden, plants serving over 10,000 people typically employ biological treatment with nutrient removal (nitrogen and phosphorus) to meet stringent discharge standards. This helps protect the Baltic Sea from eutrophication.
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