THEIX Le Grazo Wastewater Treatment Plant, Theix-Noyalo, Brittany

THEIX Le Grazo is a wastewater treatment plant located in Theix-Noyalo, in the Brittany region of France. The plant serves a population of approximately 1,924 and has a designed capacity of 2,100 m³/day, with an average daily discharge of 343.24 m³/day. Its advanced treatment level ensures high-quality effluent before discharge. As a facility in France, THEIX Le Grazo operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on population size and receiving water sensitivity. For agglomerations under 10,000 population equivalent, secondary treatment is typically required, but this plant provides advanced treatment, exceeding baseline standards. The plant is situated less than 10 km from the Atlantic coast, discharging into a coastal environment. The treated effluent ultimately reaches the Gulf of Morbihan, a semi-enclosed marine area that supports diverse aquatic life and is ecologically sensitive. The plant's advanced treatment helps protect this coastal ecosystem from nutrient pollution.

THEIX Le Grazo discharges into the coastal waters of the Gulf of Morbihan, a semi-enclosed bay on the Atlantic coast of Brittany. This marine environment supports seagrass beds, shellfish beds, and migratory bird populations. The plant's advanced treatment reduces nutrient loads, helping to prevent eutrophication in this ecologically sensitive coastal area.