ARV Rimforsa Wastewater Treatment Plant, Rimforsa, Sweden

ARV Rimforsa is a wastewater treatment facility located in Rimforsa, Kinda Municipality, Östergötland County, Sweden. The plant serves a population of approximately 2,754 residents and is part of the municipal infrastructure managed by the local authority. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 4,000 m³/day and an average discharge volume of 432.33 m³/day, the facility operates well within its capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), Sweden requires advanced treatment for plants serving agglomerations over 10,000 population equivalent in sensitive areas; for smaller plants like ARV Rimforsa, secondary treatment is typically sufficient, but the advanced level indicates a higher environmental standard. The treated effluent is discharged into local watercourses that eventually drain into the Baltic Sea. The plant plays a key role in protecting the region's lakes and rivers from nutrient pollution, supporting aquatic ecosystems and recreational water quality in the Kinda Canal system.

ARV Rimforsa discharges treated wastewater into local streams that flow into the Stångån River and ultimately into the Baltic Sea via the Motala Ström system. The Baltic Sea is a brackish, semi-enclosed sea sensitive to eutrophication from nutrient inputs. The plant's advanced treatment helps reduce nitrogen and phosphorus loads, protecting downstream lakes and coastal waters from algal blooms and oxygen depletion.