DEVECEY BONNAY Wastewater Treatment Plant, Voray-sur-l'Ognon, France

DEVECEY BONNAY is an advanced wastewater treatment plant located in Voray-sur-l'Ognon, in the Bourgogne-Franche-Comté region of France. The plant serves a population of approximately 2,700 people, classifying it as a small agglomeration under EU regulations. It is situated in the Ognon River valley, near the city of Vesoul. 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The designed capacity is 4,667 cubic meters per day, with a current discharge volume of 481.68 cubic meters per day, indicating ample reserve capacity. The treated effluent is discharged into the Ognon River, a tributary of the Saône River, which flows into the Rhône and eventually the Mediterranean Sea. The plant plays a key role in maintaining water quality in the Ognon watershed, supporting aquatic life and downstream ecosystems. Its advanced treatment helps reduce nutrient loading, which is critical for preventing eutrophication in the Rhône basin.

The plant discharges into the Ognon River, a tributary of the Saône River, which flows into the Rhône River and ultimately the Mediterranean Sea. The Ognon watershed supports diverse aquatic habitats and is important for regional biodiversity. Advanced treatment at this plant helps control nutrient pollution, protecting downstream water quality in the Saône and Rhône rivers, which are ecologically sensitive and support fisheries and recreation.