CHAUSSIN ASNANS nouvelle Wastewater Treatment Plant, Longwy-sur-le-Doubs, France

CHAUSSIN ASNANS nouvelle is an advanced wastewater treatment plant located in Longwy-sur-le-Doubs, in the Bourgogne-Franche-Comté region of France. The plant serves a population of 2,433 and has a designed capacity of 2,500 m³/day, with an average discharge volume of 434 m³/day. 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. This level of treatment is typically implemented in sensitive areas to reduce nutrient loads and protect receiving water bodies. The treated effluent is discharged into the local watershed, which ultimately drains into the Doubs River, a tributary of the Saône, and then into the Rhône River before reaching the Mediterranean Sea. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the region.

The plant discharges into the Doubs River basin, which flows through the Jura region and joins the Saône River near Verdun-sur-le-Doubs. The Saône then flows into the Rhône, which empties into the Mediterranean Sea. The watershed supports diverse aquatic life, including fish species such as brown trout and grayling, and is an important corridor for migratory birds. Advanced treatment at this plant helps reduce nutrient pollution, safeguarding water quality in this ecologically sensitive river system.