LANGUIDIC Coet Megan Wastewater Treatment Plant, Languidic, Bretagne

LANGUIDIC Coet Megan is an advanced wastewater treatment plant located in Languidic, in the Bretagne region of France. The plant serves a population of approximately 3,385 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU directive for agglomerations of this size. With a designed capacity of 6,000 m³/day, the plant operates well within its capacity, treating an average daily volume of 603.88 m³. This advanced treatment ensures high-quality effluent suitable for discharge into sensitive environments. The treated wastewater is discharged into local water bodies that eventually drain into the Atlantic Ocean via the Blavet River and the Bay of Biscay. The plant plays a crucial role in protecting the region's aquatic ecosystems, including the nearby Ria d'Étel, a coastal estuary that supports diverse marine life and is an important area for migratory birds.

The plant discharges into the Blavet River watershed, which flows into the Atlantic Ocean through the Bay of Biscay. The downstream environment includes the Ria d'Étel, a coastal estuary known for its rich biodiversity and as a nursery for fish species. Advanced treatment at this plant helps minimize nutrient loading and protects the sensitive coastal ecosystem from eutrophication.