Overview
Sandhamn Avloppsanläggning is an advanced wastewater treatment plant serving 1,513 people in Sandhamn, Sweden. It discharges 237.51 m³/day of treated effluent into the Baltic Sea coastal zone.
Sandhamn Avloppsanläggning is a municipal wastewater treatment facility located on the island of Sandhamn in the Stockholm archipelago, Sweden. The plant serves a small population of 1,513 residents and operates with a designed capacity of 3,000 m³/day, indicating it is sized for seasonal tourist influx typical of coastal communities. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC). For small agglomerations in sensitive coastal areas like the Baltic Sea, advanced treatment helps reduce nutrient loads that contribute to eutrophication. The plant's discharge volume of 237.51 m³/day is well within its capacity. Treated effluent is discharged into the Baltic Sea, a semi-enclosed brackish sea with limited water exchange, making it highly sensitive to nutrient pollution. The Stockholm archipelago supports diverse marine life and is an important recreational and ecological area. The plant's advanced treatment helps protect this fragile coastal environment from excessive nitrogen and phosphorus inputs.
Environmental context
The plant discharges into the Baltic Sea, specifically the Stockholm archipelago, which is part of the greater Baltic Sea basin. The Baltic Sea is a brackish water body with limited tidal exchange, making it vulnerable to eutrophication from nutrient runoff. The archipelago provides critical habitat for fish, birds, and aquatic plants, and supports local tourism and fishing. Advanced treatment at this plant helps reduce nutrient loading, contributing to the health of this sensitive coastal ecosystem.
Frequently asked questions
Sandhamn Avloppsanläggning is located on Trovillevägen in Sandhamn, Värmdö kommun, Stockholm County, Sweden. It serves the island community of Sandhamn in the Stockholm archipelago.
The plant serves a population of 1,513 residents. Its designed capacity of 3,000 m³/day suggests it also accommodates seasonal visitors, as Sandhamn is a popular tourist destination.
The plant discharges treated effluent into the Baltic Sea via the Stockholm archipelago. The advanced treatment process removes nutrients and pollutants before release, helping to protect the sensitive coastal marine environment.
As a Swedish plant serving fewer than 2,000 people, it falls under the EU Urban Waste Water Treatment Directive (91/271/EEC) which requires appropriate treatment for small agglomerations. Being in a coastal area sensitive to eutrophication, the plant's advanced treatment exceeds the minimum secondary treatment standard.
In Sweden, small wastewater treatment plants serving around 1,500 people typically employ mechanical, biological, and chemical treatment steps to meet national discharge standards. For coastal plants in the Baltic Sea region, advanced treatment including phosphorus removal is common to combat eutrophication.
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