Alvim avlopsanlegg - Sarpsborg Wastewater Treatment Plant, Norway

Alvim avlopsanlegg is a municipal wastewater treatment plant located in Sarpsborg, Østfold, Norway. Serving a population equivalent of 62,058, the plant is a key component of the region's sanitation infrastructure, handling wastewater from the urban area and surrounding communities. As a Norwegian facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which Norway implements through its national regulations. For agglomerations of this size (over 50,000 population equivalent), the directive requires secondary treatment as a minimum, with tertiary treatment in sensitive areas. The plant's designed capacity is 1.00 (likely in million cubic meters per year or similar unit), indicating its scale. The plant's treated effluent is discharged into the Glomma River, Norway's longest river, which flows through Sarpsborg and into the Skagerrak strait near Fredrikstad. The Glomma river basin supports diverse aquatic life and is an important ecological corridor. The discharge contributes to the nutrient load in the river and ultimately the marine environment, making treatment quality critical for downstream water quality.

The plant discharges into the Glomma River, which flows southward through Østfold county and empties into the Skagerrak at Fredrikstad. The Glomma basin is Norway's largest river system, supporting salmon and sea trout populations. The river's estuary is ecologically sensitive, providing habitat for migratory birds and marine species. Nutrient inputs from wastewater treatment must be managed to prevent eutrophication in the coastal waters.