CADILLAC Wastewater Treatment Plant, Béguey, Nouvelle-Aquitaine, France

The CADILLAC wastewater treatment plant is located in Béguey, within the Gironde department of Nouvelle-Aquitaine, France. It serves a population of approximately 3,402 residents, classifying it as a small to medium agglomeration under French regulations. The plant is situated near the Garonne River, which flows through the region and ultimately reaches the Atlantic Ocean. The facility provides advanced treatment, which goes beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 3,500 m³/day and a current discharge volume of 606.91 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The advanced treatment likely includes nutrient removal to protect sensitive water bodies. The treated effluent is discharged into the local watershed, which drains into the Garonne River and eventually the Gironde estuary and the Bay of Biscay. This region supports diverse aquatic life and is important for migratory fish species. The plant's advanced treatment helps minimize nutrient loading and protects downstream ecosystems.

The plant discharges into the Garonne River basin, which flows through southwestern France to the Gironde estuary and the Atlantic Ocean. The Garonne supports diverse aquatic habitats, including spawning grounds for migratory fish such as Atlantic salmon and European eel. Advanced treatment at this facility reduces nutrient pollution, helping to maintain water quality in the estuary and coastal zone.