Kattastrands avloppsreningsver - Härnösand Municipal Wastewater Treatment Plant

Kattastrands avloppsreningsver is a municipal wastewater treatment plant located in Kattastrand, Härnösand, within Härnösands domkyrkodistrikt, Västernorrlands län, Sweden. The plant serves a population of about 22,984, classifying it as a medium-sized agglomeration under EU standards. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), Sweden requires secondary treatment for discharges to freshwater and estuaries from 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 treated effluent from the plant is discharged into the surrounding environment, ultimately reaching the Baltic Sea via local waterways. The plant plays a key role in protecting the coastal waters of the Gulf of Bothnia from nutrient pollution and other contaminants, supporting aquatic life and recreational uses.

The plant is located within 50 km of the coast, discharging into the Gulf of Bothnia, a brackish sea arm of the Baltic Sea. This region supports diverse marine life, including fish stocks and migratory birds. Nutrient removal is critical to prevent eutrophication, a major concern in the Baltic Sea. The plant's operations help maintain water quality in local streams and the coastal zone.