Kalix avr Wastewater Treatment Plant, Kalix, Sweden

Kalix avr is a wastewater treatment plant located in Kalix, a town in Norrbotten County, northern Sweden. The plant serves a population of about 11,056 people, placing it in the medium agglomeration category under Swedish and EU regulations. As a Swedish plant, Kalix avr 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 thousand cubic meters per day or similar unit), and it is situated near the coast, which may necessitate additional considerations for nutrient removal to protect the Baltic Sea. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Gulf of Bothnia, a sensitive brackish sea environment. The region supports diverse aquatic life and is an important area for migratory fish species. Proper treatment helps reduce nutrient loading and protects the coastal ecosystem.

Kalix avr discharges into the Kalix River system, which flows into the Gulf of Bothnia, a northern arm of the Baltic Sea. The Baltic Sea is a semi-enclosed, brackish water body with limited water exchange, making it highly sensitive to nutrient pollution. The plant's location within 50 km of the coast means its effluent can influence coastal water quality, affecting local fisheries and biodiversity.