Overview
Tonsberg renseanlegg serves Tønsberg, Norway, treating wastewater for approximately 138,000 people. The plant is located near the coast and operates under Norway's implementation of the EU Urban Waste Water Treatment Directive.
Tonsberg renseanlegg is a municipal wastewater treatment plant serving the city of Tønsberg in Vestfold, Norway. With a population served of around 138,000, it is classified as a large agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant is situated at Vallø, Tolvsrød, near the Oslofjord. As a Norwegian facility, the plant must comply with national regulations that transpose the EU UWWTD. For agglomerations over 100,000 population equivalent, the directive requires secondary treatment or equivalent, and more advanced treatment if discharging into sensitive areas. The designed capacity is reported as 1.00 (likely in cubic meters per second or similar unit), indicating a substantial infrastructure. The plant's treated effluent is discharged into the Oslofjord, a fjord that connects to the Skagerrak and ultimately the North Sea. The Oslofjord is an ecologically important water body supporting diverse marine life, including fish, crustaceans, and seabirds. The plant plays a key role in protecting the fjord's water quality from nutrient loading and pollutants.
Environmental context
Tonsberg renseanlegg discharges treated wastewater into the Oslofjord, a major fjord on Norway's southeast coast. The Oslofjord flows into the Skagerrak strait and then the North Sea. This coastal environment supports diverse marine ecosystems, including kelp forests, fish spawning grounds, and migratory bird populations. Nutrient inputs from wastewater can contribute to eutrophication, making advanced treatment important for preserving water quality in the fjord.
Frequently asked questions
Tonsberg renseanlegg is located at 8A, Carl 15 gate, Vallø, Tolvsrød, Tønsberg, Vestfold, Norway, near the Oslofjord.
The plant serves approximately 138,224 people, classifying it as a large agglomeration under the EU Urban Waste Water Treatment Directive.
The treated effluent is discharged into the Oslofjord, which flows into the Skagerrak and then the North Sea.
As a Norwegian plant, it operates under national regulations implementing the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for large agglomerations and advanced treatment in sensitive areas.
Plants of this scale in Norway typically provide at least secondary biological treatment, and often include nutrient removal (nitrogen and phosphorus) to protect sensitive coastal waters like the Oslofjord.
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