Stenungsunds avloppsreningsverk - Municipal Wastewater Treatment Plant in Stenungsund, Sweden

Stenungsunds avloppsreningsverk is a municipal wastewater treatment plant located in Lillhammar, Stenungsund, within Västra Götalands län, Sweden. It serves a population of approximately 19,449 people, placing it in the medium agglomeration category under Swedish and EU regulations. As a Swedish plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day or similar unit), indicating it is sized to handle the local wastewater load. The plant's treated effluent is discharged into the local water system, which ultimately drains into the Kattegat, a part of the North Sea. This coastal discharge area supports diverse marine life and is an important ecological zone. The plant plays a key role in protecting the local aquatic environment from nutrient pollution and pathogens.

The plant discharges into the local watershed that flows into the Kattegat, a sea area between Sweden and Denmark. The Kattegat is a productive marine environment supporting fish, seabirds, and benthic communities. Nutrient inputs from wastewater must be carefully managed to prevent eutrophication, which can lead to algal blooms and oxygen depletion in coastal waters.