Bordeaux Canejan Bourg Wastewater Treatment Plant, Canéjan, France

Bordeaux Canejan Bourg is an advanced wastewater treatment plant located in Canéjan, a commune in the Gironde department of Nouvelle-Aquitaine, southwestern France. The plant serves a population of approximately 3,714 residents and is part of the municipal wastewater infrastructure for the Bordeaux metropolitan area. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 4,250 m³/day and a current discharge volume of 662.57 m³/day, the facility operates well within its capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations of this size are required to provide secondary treatment, but Bordeaux Canejan Bourg exceeds these standards with its advanced treatment level. The treated effluent is discharged into the local watershed, which ultimately drains into the Garonne River and then the Gironde estuary, a major ecological zone on the Atlantic coast. The plant's advanced treatment helps protect the sensitive estuarine environment and supports water quality in the region.

The plant discharges into the Garonne River basin, which flows into the Gironde estuary, the largest estuary in Europe. This estuary is a critical habitat for migratory fish such as salmon and sturgeon, and supports diverse aquatic life. The advanced treatment at Bordeaux Canejan Bourg reduces nutrient loads, helping to prevent eutrophication in the downstream coastal waters of the Bay of Biscay.