Overview
Mjondalen avlopsanlegg is a municipal wastewater treatment plant serving approximately 22,000 people in Mjøndalen, Norway. It operates under Norway's implementation of the EU Urban Waste Water Treatment Directive.
Mjondalen avlopsanlegg is a municipal wastewater treatment plant located in Mjøndalen, a town in the Buskerud region of Norway. The plant serves a population of approximately 22,000, classifying it as a medium-sized agglomeration under Norwegian and EU regulatory frameworks. Its location near the Drammen River places it within a significant watershed that drains into the Oslofjord. As a Norwegian plant, Mjondalen avlopsanlegg 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 requirements in sensitive areas. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day or similar unit), indicating a facility sized for its service population. The plant's treated effluent is discharged into the Drammen River system, which flows into the Drammensfjord, a branch of the Oslofjord. This fjord is an ecologically important marine environment that supports diverse aquatic life and is a key recreational and commercial waterway. Proper treatment helps protect water quality in the fjord, which is subject to nutrient enrichment concerns from urban and agricultural runoff.
Environmental context
The plant discharges into the Drammen River, which flows into the Drammensfjord and ultimately the Oslofjord. The Oslofjord is a semi-enclosed marine ecosystem that supports diverse fish populations, including cod and herring, and serves as an important migratory corridor for seabirds. Nutrient loading from wastewater can contribute to algal blooms and oxygen depletion in the fjord's deeper basins, making effective treatment critical for maintaining ecological balance.
Frequently asked questions
Mjondalen avlopsanlegg is located in Mjøndalen, a town in the Buskerud region of Norway, near the Drammen River.
The plant serves approximately 22,073 people, classifying it as a medium-sized agglomeration under Norwegian and EU regulatory frameworks.
The plant discharges treated effluent into the Drammen River system, which flows into the Drammensfjord and then the Oslofjord.
As a Norwegian plant, it operates under national regulations that implement the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size.
For agglomerations between 10,000 and 100,000 people, the EU UWWTD mandates secondary treatment as a minimum, with tertiary treatment required in sensitive areas like the Oslofjord.
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