BOISSISE LE ROI Wastewater Treatment Plant, Boissise-le-Roi, France

The BOISSISE LE ROI wastewater treatment plant is located in Boissise-le-Roi, a commune in the Seine-et-Marne department of north-central France. The facility serves a population of approximately 3,445 residents and is situated along the Seine River, reflecting its role in managing municipal wastewater for this suburban community near Melun. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 8,000 cubic meters per day and a current discharge volume of about 615 cubic meters per day, the facility operates well within its capacity, ensuring effective treatment and compliance with French water quality standards. The treated effluent is discharged into the Seine River, which flows through Paris and eventually into the English Channel. The plant's advanced treatment helps protect the Seine's water quality, supporting aquatic life and downstream uses such as recreation and drinking water production. Its location in the Seine basin underscores its importance in maintaining the ecological health of this major European waterway.

The plant discharges into the Seine River, which flows northwest through Paris and the Normandy region before emptying into the English Channel at Le Havre. The Seine basin supports diverse aquatic ecosystems, including fish species such as salmon and eel, and provides habitat for migratory birds. Advanced treatment at this plant helps reduce nutrient loads and pollutants, mitigating eutrophication risks in the river and its estuary.