ARGENTRE ETRELLES Wastewater Treatment Plant, Étrelles, Bretagne

ARGENTRE ETRELLES is a wastewater treatment plant located in Étrelles, a commune in the Ille-et-Vilaine department of Bretagne, France. The plant serves a population of 5,550 and is situated inland, away from coastal areas. 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant's designed capacity is 9,500 m³/day, and it currently discharges 990.11 m³/day, indicating significant spare capacity. The treated effluent is discharged into local watercourses that are part of the Vilaine River basin. The Vilaine River flows into the Atlantic Ocean via the Bay of Biscay. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the region, which is important for agriculture and biodiversity.

The plant discharges into the Vilaine River basin, which drains into the Atlantic Ocean. The Vilaine River supports diverse aquatic life and is an important water resource for the region. Advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in downstream waters and the coastal zone.