ASSERAC Pont Berin Wastewater Treatment Plant, Pont d'Armes, France

ASSERAC Pont Berin is a municipal wastewater treatment plant located in Pont d'Armes, within the commune of Assérac in the Pays de la Loire region of western France. The plant serves a population of approximately 2,000 residents and has a designed capacity of 4,000 m³/day, currently treating an average daily flow of 356.80 m³/day. The plant provides secondary treatment, which is the minimum 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 before discharge. The plant operates under the French regulatory framework, which implements the EU directive through national legislation and permits issued by the local water agency. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Vilaine River estuary or nearby coastal waters. The plant's proximity to the coast (within 10 km) means its discharge can influence the sensitive marine environment of the Bay of Biscay, which supports diverse aquatic life and important fisheries.

The plant discharges into the coastal watershed of the Bay of Biscay, a productive marine ecosystem that supports commercial fisheries and migratory bird populations. The receiving waters are part of the larger Atlantic Ocean basin, where nutrient inputs from treated wastewater can affect water quality and marine habitats. The area's tidal dynamics and proximity to the coast require careful management of effluent to protect sensitive coastal ecosystems.