Overview
Kungsängens Reningsverk serves Västerås, Sweden, treating wastewater for approximately 139,000 people. The plant discharges into Lake Mälaren, a major freshwater source, and operates under EU regulations.
Kungsängens Reningsverk is the primary wastewater treatment plant for Västerås, a city in Västmanland County, Sweden, situated on the shore of Lake Mälaren. Serving a population of around 139,000, the plant is a key component of the region's municipal infrastructure. The facility is located within 50 km of the coast, though its discharge flows into the lake system rather than directly to the sea. As a large agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC), the plant is expected to provide at least secondary treatment, with tertiary treatment required if discharging into sensitive areas. Lake Mälaren is a significant freshwater body that supplies drinking water to Stockholm and supports diverse aquatic life, making advanced treatment essential for protecting water quality. The plant's treated effluent enters Lake Mälaren, which drains via the Norrström river into the Baltic Sea. This connection links the facility to the broader Baltic Sea ecosystem, where nutrient loading from wastewater can contribute to eutrophication. Effective treatment at Kungsängens Reningsverk helps mitigate this risk, supporting both local and downstream environmental health.
Environmental context
Kungsängens Reningsverk discharges into Lake Mälaren, Sweden's third-largest lake, which flows through the Norrström river system into the Baltic Sea. The lake is a critical drinking water reservoir for millions and supports rich biodiversity, including fish species like pike and perch. Nutrient reduction from the plant is vital to prevent algal blooms in the Baltic Sea, a region already stressed by eutrophication.
Frequently asked questions
Kungsängens Reningsverk is located in Västerås, Sweden, on the shore of Lake Mälaren in Västmanland County.
The plant serves approximately 139,000 people, classifying it as a large agglomeration under EU regulations.
Treated wastewater from the plant is discharged into Lake Mälaren, which flows via the Norrström river into the Baltic Sea.
As a Swedish plant serving over 100,000 people, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment and potentially tertiary treatment for sensitive areas like Lake Mälaren.
In Sweden, plants of this scale typically provide mechanical, biological, and chemical treatment (tertiary) to meet stringent nutrient removal standards, especially when discharging into lakes or the Baltic Sea.
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