Station d'epuration du longeron - Advanced Wastewater Treatment in Sèvremoine, France

Station d'epuration du longeron is a wastewater treatment facility located in the commune of Sèvremoine, within the Maine-et-Loire department of the Pays de la Loire region in western France. The plant serves a population of 2,233 and has a designed capacity of 2,550 cubic meters per day, with an average discharge volume of 398.36 cubic meters per 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant operates under French regulations that implement the EU directive, overseen by the local water agency (Agence de l'Eau Loire-Bretagne). The treated effluent is discharged into the local watershed, which is part of the Loire River basin. The Loire River is one of France's longest rivers and flows into the Atlantic Ocean. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports the ecological health of the Loire basin, which is home to diverse species including migratory fish such as Atlantic salmon and European eel.

The plant discharges into a tributary of the Loire River, which flows through the Pays de la Loire region before reaching the Atlantic Ocean. The Loire basin supports a rich diversity of aquatic life, including migratory fish species. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream water quality and the ecological balance of the river and its estuary.