Overview
CESSON SEVIGNE 1 is a municipal wastewater treatment plant in Cesson-Sévigné, Brittany, France, serving approximately 18,500 people. It operates under the EU Urban Waste Water Treatment Directive.
CESSON SEVIGNE 1 is a municipal wastewater treatment plant located in Cesson-Sévigné, a suburb of Rennes in the Brittany region of France. The plant serves a population of around 18,500, placing it in the medium agglomeration category under EU regulations. As a French facility, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas. The plant's treatment processes are designed to meet these regulatory standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Vilaine River and then into the Atlantic Ocean. The plant plays a key role in protecting the water quality of the Vilaine basin and the downstream marine environment, supporting aquatic life and recreational uses.
Environmental context
The plant discharges into the Vilaine River basin, which flows into the Atlantic Ocean via the Bay of Biscay. This watershed supports diverse aquatic ecosystems and is important for regional biodiversity. The plant's operations help maintain water quality in this ecologically sensitive area, reducing nutrient loads that could otherwise contribute to eutrophication in coastal waters.
Frequently asked questions
CESSON SEVIGNE 1 is located in Cesson-Sévigné, a commune in the Ille-et-Vilaine department of Brittany, France. It serves the northeastern suburbs of Rennes.
The plant serves approximately 18,500 people, classifying it as a medium-sized agglomeration under EU wastewater treatment regulations.
The treated effluent is discharged into the local watershed, which flows into the Vilaine River and eventually reaches the Atlantic Ocean. The discharge is regulated to protect water quality.
The plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. French authorities enforce compliance through national permits.
Under the EU UWWTD, plants serving between 10,000 and 100,000 population equivalent typically require secondary treatment. In sensitive areas, additional nutrient removal may be mandated.
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