Öregrunds Avloppsreningsverk - Advanced Wastewater Treatment in Öregrund, Sweden

Öregrunds Avloppsreningsverk is a municipal wastewater treatment facility located in Öregrund, a coastal town in Östhammars kommun, Uppsala län, Sweden. The plant serves a population of around 1,448 residents, reflecting its role in a small community. It operates with advanced treatment processes, ensuring high-quality effluent before discharge. As an advanced treatment plant, Öregrunds Avloppsreningsverk meets stringent Swedish and EU standards for wastewater treatment. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), smaller agglomerations like Öregrund are required to provide appropriate treatment, and the advanced level here indicates effective removal of nutrients and pollutants. The plant's designed capacity is 3,900 m³/day, with a current discharge volume of 227.31 m³/day, suggesting ample capacity for future growth. The treated effluent is discharged into the Baltic Sea via local coastal waters. The Baltic Sea is a sensitive brackish environment with limited water exchange, making nutrient removal critical to prevent eutrophication. The plant's advanced treatment helps protect this ecologically important sea, supporting marine life and water quality in the region.

Öregrunds Avloppsreningsverk discharges treated wastewater into the Baltic Sea, a semi-enclosed brackish sea with high ecological sensitivity. The Baltic Sea suffers from eutrophication due to nutrient inputs, and advanced treatment at this plant helps reduce nitrogen and phosphorus loads. The local coastal waters support diverse aquatic life, including fish spawning grounds and migratory bird habitats. Protecting this environment is vital for the region's biodiversity and recreational use.