Theix Lanfloy Wastewater Treatment Plant, Theix-Noyalo, Brittany, France

Theix Lanfloy is a wastewater treatment plant located in Theix-Noyalo, within the Morbihan department of Brittany, France. The facility serves a population of approximately 3,068 and operates under the regulatory framework of the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which sets standards for wastewater collection and treatment in agglomerations. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 2,500 cubic meters per day and an average discharge volume of 547 cubic meters per day, the plant operates well within its capacity. For small agglomerations like this, secondary treatment is the required level under the EU directive, ensuring compliance with environmental standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Gulf of Morbihan, a semi-enclosed marine inlet of the Bay of Biscay. The Gulf of Morbihan is an ecologically sensitive area that supports diverse aquatic life, including seagrass beds and migratory bird populations. The plant's coastal location necessitates careful management to protect the marine environment.

The treated effluent from Theix Lanfloy flows into the local watercourses that drain into the Gulf of Morbihan, a coastal basin connected to the Bay of Biscay and the Atlantic Ocean. The Gulf of Morbihan is an ecologically important area characterized by rich biodiversity, including extensive seagrass meadows and nursery habitats for fish. The plant's proximity to the coast (within 10 km) means that its discharge can directly influence the marine environment, making effective treatment essential to prevent nutrient enrichment and protect sensitive ecosystems.