Overview
Himmerfjardsverket in Sibble, Sweden serves 270,500 people. The plant operates under EU Urban Waste Water Treatment Directive 91/271/EEC, requiring advanced treatment for large agglomerations discharging into sensitive coastal areas.
Himmerfjardsverket is a major wastewater treatment plant located in Sibble, within Botkyrka municipality, Stockholm County, Sweden. Serving a population equivalent of 270,500, it is classified as a large agglomeration under EU regulations. The plant is situated near the Baltic Sea coast, approximately 50 km south of Stockholm. As a large-scale facility, Himmerfjardsverket is subject to stringent treatment requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations over 150,000 population equivalent discharging into sensitive areas like the Baltic Sea, the directive mandates tertiary treatment including nutrient removal. The plant's scale and coastal location imply advanced treatment to reduce nitrogen and phosphorus loads. The treated effluent from Himmerfjardsverket discharges into Himmerfjarden, a bay of the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it highly sensitive to eutrophication from nutrient inputs. The plant plays a critical role in protecting the coastal ecosystem by reducing nutrient pollution, supporting marine biodiversity and water quality in the Stockholm archipelago.
Environmental context
Himmerfjardsverket discharges into Himmerfjarden, a bay connected to the Baltic Sea via the Stockholm archipelago. The Baltic Sea is a brackish water body with a long residence time, making it vulnerable to nutrient enrichment. The plant's advanced treatment helps mitigate eutrophication, which can cause algal blooms and oxygen depletion in bottom waters, affecting fish populations and overall ecosystem health.
Frequently asked questions
Himmerfjardsverket is located in Sibble, Botkyrka municipality, Stockholm County, Sweden, near the Baltic Sea coast.
The plant serves a population equivalent of 270,500, classifying it as a large agglomeration under EU regulations.
The treated effluent is discharged into Himmerfjarden, a bay of the Baltic Sea, contributing to the protection of the sensitive coastal ecosystem.
As a large agglomeration (>150,000 PE) discharging into a sensitive area (Baltic Sea), the plant is required to meet tertiary treatment standards under the EU Urban Waste Water Treatment Directive (91/271/EEC), including nutrient removal.
In Sweden, large wastewater plants serving over 150,000 people typically employ advanced treatment with biological nutrient removal (nitrogen and phosphorus) to meet strict discharge limits, especially when discharging into the Baltic Sea.
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