Overview
Vannes Tohannic wastewater treatment plant serves Séné, France, with a population equivalent of 65,324. It is located in the Brittany region near the Gulf of Morbihan.
The Vannes Tohannic wastewater treatment plant is situated in Séné, a commune in the Morbihan department of Brittany, France. It serves a population equivalent of 65,324, classifying it as a medium-sized agglomeration under French and EU regulations. The plant is part of the wastewater infrastructure for the Vannes urban area, managed within the regional framework of Brittany. Under the EU Urban Waste Water Treatment Directive 91/271/EEC, agglomerations of this scale (between 10,000 and 100,000 population equivalent) are required to have secondary treatment as a minimum. In sensitive areas, such as those near coastal zones or eutrophication-prone water bodies, tertiary treatment may be mandated. It operates within this regulatory context. The plant discharges into the Gulf of Morbihan, a semi-enclosed sea that connects to the Atlantic Ocean. The Gulf is an ecologically rich area supporting diverse marine life, including seagrass beds and migratory bird populations. The plant's operations are critical to protecting this sensitive coastal ecosystem from nutrient pollution and other contaminants.
Environmental context
The Vannes Tohannic plant discharges into the Gulf of Morbihan, a coastal inlet of the Atlantic Ocean. The Gulf is a highly productive ecosystem with extensive seagrass meadows, mudflats, and salt marshes that support diverse aquatic life, including fish, shellfish, and migratory birds. Nutrient loading from wastewater can lead to eutrophication, so effective treatment is essential to maintain water quality and ecological balance in this semi-enclosed marine environment.
Frequently asked questions
The Vannes Tohannic plant is located in Séné, a commune in the Morbihan department of Brittany, France. Its address is Rue de Kerhuilieu, Kerhuilieu, Séné.
The plant serves a population equivalent of 65,324, which includes residential and commercial wastewater from the Vannes urban area.
The treated wastewater is discharged into the Gulf of Morbihan, a coastal inlet of the Atlantic Ocean. The plant's discharge location is near the coast, requiring careful management to protect the marine environment.
As a French plant serving over 10,000 population equivalent, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which mandates secondary treatment and, in sensitive coastal areas, may require tertiary treatment to reduce nutrients.
In France, plants of this scale typically employ secondary biological treatment (e. g. , activated sludge) and may include nutrient removal (nitrogen and phosphorus) if discharging into sensitive waters like the Gulf of Morbihan.
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