SENS DE BRETAGNE Wastewater Treatment Plant, Sens-de-Bretagne, Bretagne

SENS DE BRETAGNE is a municipal wastewater treatment plant located in Sens-de-Bretagne, a commune in the Ille-et-Vilaine department of Bretagne, France. The plant serves a population of 4,560 and is situated inland, approximately 10-50 km from the coast. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides advanced treatment, which goes beyond the secondary treatment required by the EU directive for agglomerations of this size (2,000-10,000 population equivalent). Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant has a designed capacity of 3,000 m³/day and currently discharges 813.50 m³/day of treated wastewater. The treated effluent is discharged into local watercourses that drain toward the English Channel, likely via the Ille River or its tributaries. The region's watershed supports diverse aquatic life and is important for both ecological balance and agricultural water use. The advanced treatment level helps minimize nutrient loading and protects downstream estuarine and coastal ecosystems.

The plant discharges into the local watershed of the Ille-et-Vilaine region, which ultimately drains into the English Channel via the Rance River or similar coastal rivers. This area supports diverse aquatic habitats and is important for migratory fish species. The advanced treatment process reduces nutrient pollution, helping to prevent eutrophication in downstream estuaries and coastal zones.