Overview
Lerdals ARV is a municipal wastewater treatment plant serving Rättvik, Sweden. It treats wastewater from approximately 7,500 people in Dalarna County.
Lerdals ARV is a wastewater treatment plant located in Rättvik, a town in Dalarna County, Sweden. The plant serves a population of approximately 7,473 people, making it a medium-sized facility within the Swedish municipal wastewater infrastructure. It is situated in a region known for its lakes and forests, near the shore of Lake Siljan. As a Swedish wastewater treatment plant, Lerdals ARV operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which sets standards for collection, treatment, and discharge of urban wastewater. For agglomerations of this size (between 2,000 and 10,000 population equivalent), the directive requires secondary treatment or equivalent. Swedish regulations also mandate nutrient removal in sensitive areas, which includes many inland waters. The plant's treated effluent is discharged into the local watershed, which ultimately drains into Lake Siljan, one of Sweden's largest and most iconic lakes. Lake Siljan is a significant recreational and ecological resource, supporting diverse aquatic life and serving as a drinking water source for surrounding communities. The plant plays a crucial role in protecting this sensitive lake ecosystem from nutrient pollution and other contaminants.
Environmental context
Lerdals ARV discharges into the catchment of Lake Siljan, a large oligotrophic lake in Dalarna County. Lake Siljan is fed by several rivers and streams and drains via the Dalälven River into the Baltic Sea. The lake supports a diverse fish population, including Arctic char and brown trout, and is an important site for recreation and tourism. Protecting water quality in this watershed is critical to maintaining the lake's ecological health and its role as a regional water resource.
Frequently asked questions
Lerdals ARV is located in Rättvik, a town in Dalarna County, Sweden. The plant is situated near the shore of Lake Siljan.
Lerdals ARV serves approximately 7,473 people, classifying it as a medium-sized agglomeration under EU wastewater directives.
The treated wastewater from Lerdals ARV is discharged into the local watershed, which flows into Lake Siljan. From there, water eventually reaches the Baltic Sea via the Dalälven River.
As a Swedish plant, Lerdals ARV operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of its size. Swedish national regulations also enforce nutrient removal to protect sensitive inland waters like Lake Siljan.
For agglomerations between 2,000 and 10,000 population equivalent, the EU UWWTD mandates secondary treatment. In Sweden, many such plants also incorporate phosphorus removal to meet stringent limits for inland lakes and rivers.
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