Overview
Strangnas Avloppsreningsverk serves Strängnäs, Sweden, treating wastewater for approximately 26,000 people. The plant operates under Sweden's implementation of the EU Urban Waste Water Treatment Directive.
Strangnas Avloppsreningsverk is the municipal wastewater treatment plant for Strängnäs, a city in Södermanland County, Sweden. The plant serves a population of approximately 26,128, placing it in the medium agglomeration category under EU classification. As a Swedish plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant's designed capacity is 1.00 (likely in thousand cubic meters per day or similar unit), indicating adequate infrastructure for the served population. The plant discharges treated effluent into the local watershed, which ultimately drains into Lake Mälaren, Sweden's third-largest lake. Lake Mälaren is a vital freshwater resource and supports diverse aquatic ecosystems. The plant's operations contribute to protecting the lake's water quality and the broader Baltic Sea catchment area.
Environmental context
The plant's treated effluent enters the local drainage network that flows into Lake Mälaren, a large freshwater lake in eastern Sweden. Lake Mälaren drains into the Baltic Sea via Stockholm's archipelago. The lake supports important fisheries and serves as a drinking water source for millions. Protecting its water quality through effective wastewater treatment is critical for both ecological health and human use.
Frequently asked questions
The plant is located at Gorsingeholmsvägen in the Ulvhäll area of Strängnäs, Södermanland County, Sweden.
The plant serves approximately 26,128 people, classifying it as a medium-sized agglomeration under EU standards.
The plant discharges treated effluent into the local watershed, which flows into Lake Mälaren and eventually reaches the Baltic Sea.
As a Swedish plant serving over 10,000 people, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment and, in sensitive areas, tertiary treatment to protect water bodies.
In Sweden, plants of this scale typically employ secondary biological treatment, often with nutrient removal to meet strict discharge limits, especially when discharging into sensitive waters like Lake Mälaren.
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