Prahecq Wastewater Treatment Plant, Nouvelle-Aquitaine, France

The Prahecq wastewater treatment plant is located in the commune of Prahecq, within the Deux-Sèvres department of Nouvelle-Aquitaine, France. It serves a population of approximately 3,200 residents, making it a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated inland, away from coastal areas, and its operations are integrated into the regional water management framework. The facility employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant's designed capacity is 3,500 m³/day, with an average daily discharge of 573 m³, indicating ample reserve capacity for future growth. The treated effluent is discharged into local watercourses that ultimately drain into the Atlantic Ocean via the Sèvre Niortaise river basin. This region supports diverse aquatic life and is part of the larger Loire-Brittany basin. The advanced treatment helps minimize nutrient loading, protecting downstream ecosystems and maintaining water quality in the Marais Poitevin, an important wetland area.

The plant discharges into the Sèvre Niortaise river system, which flows through the Marais Poitevin wetland before reaching the Bay of Biscay in the Atlantic Ocean. The Marais Poitevin is a vast area of marshland and canals that supports rich biodiversity, including migratory birds and aquatic plants. Advanced treatment at Prahecq reduces nutrient pollution, helping to preserve this ecologically sensitive downstream environment.