TILLY SUR SEULLES Wastewater Treatment Plant, Normandy, France

TILLY SUR SEULLES is a wastewater treatment plant located in Tilly-sur-Seulles, a commune in the Calvados department of Normandy, France. The plant serves a population of approximately 5,463 people, placing it in the small-to-medium agglomeration category under French regulations. It is situated near the Seulles River, which flows through the region and into the English Channel. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant has a designed capacity of 4,000 cubic meters per day and currently treats an average daily volume of about 975 cubic meters, indicating ample reserve capacity. Treated effluent from the plant is discharged into the Seulles River, a coastal river that flows into the English Channel near Courseulles-sur-Mer. The river supports diverse aquatic life and is part of the regional drainage network. The plant's advanced treatment helps protect the downstream environment, including the Bay of the Seine, which is ecologically sensitive and supports fisheries and marine habitats.

The plant discharges into the Seulles River, which flows approximately 30 kilometers to the English Channel. The river supports a variety of freshwater species and is part of the larger Seine Bay ecosystem, which is important for migratory birds and marine life. Advanced treatment at the plant reduces nutrient loading, helping to prevent eutrophication in the coastal waters of the English Channel.