CERS Wastewater Treatment Plant, Villeneuve-lès-Béziers, Occitanie

CERS is a wastewater treatment plant located in Villeneuve-lès-Béziers, in the Occitanie region of southern France. The plant serves a population of approximately 3,100 people, placing it in the small agglomeration category under French and EU regulations. Its location near the Mediterranean coast influences its operational and environmental requirements. The plant employs advanced treatment processes, which go beyond the secondary treatment standard mandated by the EU Urban Waste Water Treatment Directive (91/271/EEC) for sensitive areas. With a designed capacity of 3,200 m³/day and a current discharge volume of 553.03 m³/day, the plant operates well within its capacity. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect receiving waters from eutrophication. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea. The coastal environment is ecologically sensitive, supporting diverse marine life and tourism. The plant's advanced treatment helps minimize nutrient and pollutant loads, safeguarding water quality in the region's lagoons and coastal zones.

The plant discharges into the local watershed that flows into the Mediterranean Sea near the Gulf of Lion. This coastal area supports seagrass meadows and marine biodiversity, and is a popular tourist destination. Advanced treatment reduces nutrient inputs, helping to prevent eutrophication in the sensitive coastal lagoon ecosystems.