ARV KISA Wastewater Treatment Plant, Kisa, Sweden

ARV KISA is an advanced wastewater treatment plant located in Kisa, Kinda municipality, Östergötland County, Sweden. The facility serves a population of approximately 5,355 people and is designed to handle up to 8,000 m³ of wastewater per day, with an average daily discharge of 840.63 m³. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As a Swedish facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for discharges into sensitive areas. For a medium-sized agglomeration like Kisa, this ensures high environmental protection standards. The treated effluent is discharged into local watercourses that eventually drain into the Baltic Sea via the Motala Ström river system. The Baltic Sea is a sensitive brackish water body with eutrophication challenges, making nutrient removal at plants like ARV KISA critical for reducing nitrogen and phosphorus loads and protecting marine ecosystems.

ARV KISA discharges treated wastewater into local streams that flow into the Motala Ström river system, which ultimately reaches the Baltic Sea. The Baltic Sea is a semi-enclosed brackish sea highly sensitive to nutrient pollution, particularly nitrogen and phosphorus, which cause algal blooms and oxygen depletion. The advanced treatment at this plant helps mitigate these impacts by removing nutrients before discharge, supporting the health of downstream aquatic habitats and the broader marine environment.