SAINT MEEN 1 Wastewater Treatment Plant - Saint-Méen-le-Grand, Bretagne, France

SAINT MEEN 1 is a municipal wastewater treatment plant located in Saint-Méen-le-Grand, a commune in the Ille-et-Vilaine department of Bretagne, France. The plant serves a population of approximately 4,000 people, reflecting its role in managing wastewater for this small agglomeration. 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 standard 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 designed capacity is 5,000 m³/day, with a current discharge volume of 713.59 m³/day, indicating operational headroom. The treated effluent is discharged into the local watershed, which ultimately drains into the English Channel via the Rance River basin. The region's water bodies support diverse aquatic life and are important for both ecological balance and human use. Advanced treatment helps minimize nutrient loading and protects downstream water quality.

The plant discharges into the local catchment that feeds the Rance River, which flows northward into the English Channel. This coastal watershed supports diverse aquatic habitats and is important for migratory fish species. Advanced treatment reduces nutrient pollution, helping to prevent eutrophication in the sensitive estuarine and coastal waters of the region.