CHAVAGNES EN PAILLERS la Dederie Wastewater Treatment Plant, Vendée, France

CHAVAGNES EN PAILLERS la Dederie is a municipal wastewater treatment plant located in the commune of Chavagnes-en-Paillers, within the Vendée department of Pays de la Loire, France. The plant serves a population of 1,620 and has a designed capacity of 4,100 cubic meters per day, with an average daily discharge of 289 cubic meters. The plant provides secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring compliance with European effluent standards before discharge. The treated effluent is released into the local watershed, which ultimately drains into the Atlantic Ocean via the Vendée River system. The plant plays a key role in protecting the region's water quality, supporting downstream aquatic ecosystems and recreational uses of the river.

The plant discharges into the local watershed of the Vendée River, which flows into the Bay of Biscay (Atlantic Ocean). The downstream environment supports diverse aquatic life, including fish species such as Atlantic salmon and sea trout. The region's coastal waters are ecologically sensitive, and the plant's secondary treatment helps mitigate nutrient and organic pollution impacts on the river and marine ecosystems.