Overview
Nordre Follo renseanlegg is a wastewater treatment plant serving 43,000 people in Vinterbro, Norway. It operates under Norway's implementation of the EU Urban Waste Water Treatment Directive.
Nordre Follo renseanlegg is a municipal wastewater treatment plant located in Vinterbro, within the Ås municipality of Akershus, Norway. Serving a population of 43,000, the plant is part of the region's critical water infrastructure, handling domestic wastewater from the surrounding communities. Its location near the Oslofjord places it in a sensitive coastal environment where nutrient removal is essential to prevent eutrophication. As a Norwegian plant, it operates under national regulations that transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations serving between 10,000 and 100,000 people, the directive requires secondary treatment as a minimum, with more stringent tertiary treatment in sensitive areas. The Oslofjord is designated as a sensitive area under this directive, meaning the plant is expected to achieve nutrient removal (nitrogen and phosphorus) to protect the fjord's ecological health. The treated effluent from Nordre Follo renseanlegg discharges into the Oslofjord, a major fjord system that connects to the Skagerrak and ultimately the North Sea. The fjord supports diverse marine life, including fish, shellfish, and seabirds, and is an important recreational and economic resource for the region. Proper treatment at this plant helps maintain water quality in the fjord, reducing the risk of algal blooms and oxygen depletion.
Environmental context
The plant discharges into the Oslofjord, a deep fjord that flows into the Skagerrak and then the North Sea. The Oslofjord is a sensitive marine ecosystem that experiences seasonal stratification and limited water exchange, making it vulnerable to nutrient pollution. Effective nutrient removal at the plant helps protect the fjord's biodiversity, including its fish populations and benthic habitats, and supports recreational uses such as swimming and fishing.
Frequently asked questions
Nordre Follo renseanlegg is located in Vinterbro, within the municipality of Ås in Akershus, Norway. Its address is Høyungsletta, Vinterbro, 1415.
The plant serves a population of approximately 43,000 people, making it a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive.
The treated effluent from the plant is discharged into the Oslofjord, a coastal fjord that connects to the Skagerrak and the North Sea.
As a Norwegian plant, it operates under national regulations that implement the EU Urban Waste Water Treatment Directive (91/271/EEC). For its population size, secondary treatment is required, and due to the sensitive nature of the Oslofjord, nutrient removal is also mandated.
Plants of this scale in Norway typically employ secondary biological treatment followed by nutrient removal, especially when discharging into sensitive coastal waters like the Oslofjord. This often includes activated sludge processes with nitrogen and phosphorus removal.
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