Boujan-sur-Libron Wastewater Treatment Plant, Occitanie, France

The Boujan-sur-Libron wastewater treatment plant is located in the commune of Boujan-sur-Libron, near Béziers in the Hérault department of Occitanie, southern France. It serves a population of approximately 4,300 people, classifying it as a small to medium agglomeration under French and EU regulations. The plant operates with advanced treatment, which goes beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity is 5,000 m³ per day, with an average discharge volume of 767 m³ per day, indicating ample reserve capacity. The treated effluent is discharged into the local watershed, which ultimately drains to the Mediterranean Sea via the Orb River and coastal lagoons. The plant's proximity to the coast (within 10 km) means its discharge can influence nearshore water quality and marine ecosystems, making advanced treatment particularly important for nutrient removal and environmental protection.

The plant discharges into the Libron River, a coastal stream that flows into the Mediterranean Sea near the Orb Delta. This area supports diverse aquatic life and is part of a region with sensitive marine habitats, including seagrass meadows and nursery grounds for fish. The advanced treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in the coastal zone.