Sevenans Wastewater Treatment Plant: Advanced Treatment in Bourgogne-Franche-Comté

The Sevenans wastewater treatment plant is located in the commune of Sevenans, within the Territoire-de-Belfort department of Bourgogne-Franche-Comté, France. It serves a population of approximately 3,241 residents, classifying it as a small agglomeration under French and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,600 m³/day and an average discharge volume of 578.19 m³/day, the facility operates well within its capacity, ensuring effective treatment of municipal wastewater. Treated effluent from the plant is discharged into local watercourses that ultimately drain into the Rhône basin, contributing to the water quality of the region. The advanced treatment helps protect downstream aquatic ecosystems and supports the ecological health of the Bourgogne-Franche-Comté area.

The plant discharges into the local watershed, which is part of the Rhône basin. The treated effluent flows into small streams that eventually reach the Saône River, a major tributary of the Rhône. This region supports diverse aquatic life, including fish species such as brown trout and European eel. The advanced treatment helps minimize nutrient loading and protects the ecological balance of these water bodies.