BECHEREL Wastewater Treatment Plant, Longaulnay, Bretagne, France

The BECHEREL wastewater treatment plant is located in Longaulnay, a commune in the Ille-et-Vilaine department of Bretagne, France. It serves a population of approximately 3,300 residents, placing it within the small agglomeration category under French and EU regulations. The plant is situated inland, more than 10 kilometers from the coast, and its operations are part of the regional water management infrastructure. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 4,000 cubic meters per day and an average daily discharge of 588.71 cubic meters, the facility operates well below its capacity, indicating room for future growth or seasonal variability. The treatment level ensures high-quality effluent suitable for discharge into sensitive environments. The treated effluent from BECHEREL is discharged into local watercourses that eventually drain into the Rance River basin and the English Channel. The region's watershed supports diverse aquatic life and is important for both ecological balance and human activities such as fishing and recreation. The plant's advanced treatment helps protect downstream water quality and the coastal marine environment.

The BECHEREL plant discharges into local streams that flow into the Rance River, which empties into the English Channel near Saint-Malo. The Rance estuary is an ecologically sensitive area supporting migratory fish species and diverse birdlife. The advanced treatment level helps minimize nutrient loading and protects the downstream coastal ecosystem from eutrophication.