Arradon Prat Cadic Wastewater Treatment Plant, Arradon, Brittany

The Arradon Prat Cadic wastewater treatment plant is located in Arradon, a coastal town in the Brittany region of northwestern France. The facility serves a population of approximately 5,320 residents, reflecting its role in managing municipal wastewater for this community within the Morbihan department. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 7,000 m³/day and an average discharge volume of 949.08 m³/day, the facility operates well within its capacity, ensuring effective treatment of incoming wastewater. The treated effluent is discharged into the local coastal environment, as the plant is situated within 10 km of the Atlantic coast. This proximity to the Gulf of Morbihan, a semi-enclosed marine basin known for its rich biodiversity and shellfish farming, underscores the importance of the plant's advanced treatment in protecting water quality and marine ecosystems.

The plant discharges into the Gulf of Morbihan, a coastal inlet of the Atlantic Ocean that supports diverse marine life, including seagrass beds and shellfish populations. The Gulf is an ecologically sensitive area where nutrient pollution can lead to eutrophication, making advanced treatment crucial for maintaining water quality and protecting downstream habitats.