Overview
SAINT GILLES 35 is an advanced wastewater treatment plant in Saint-Gilles, Bretagne, France, serving 4,100 people. It discharges 731.43 m³/day of treated water, with a designed capacity of 3,500 m³/day.
SAINT GILLES 35 is an advanced wastewater treatment plant located in Saint-Gilles, a commune in the Ille-et-Vilaine department of Bretagne, France. The plant serves a population of approximately 4,100 residents, reflecting its role in managing municipal wastewater for this small agglomeration within the Rennes metropolitan area. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity is 3,500 m³/day, and it currently discharges an average of 731.43 m³/day of treated effluent, indicating significant spare capacity. As a French facility, it operates under national regulations transposing EU directives, with permits issued by the local water agency (Agence de l'Eau Loire-Bretagne). The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Vilaine River and the Rance estuary. The plant's advanced treatment helps protect the sensitive aquatic ecosystems of the Brittany region, including the Rance estuary and the Bay of Mont-Saint-Michel, which support diverse marine life and migratory bird populations.
Environmental context
The plant discharges into the Vilaine River basin, which flows into the Atlantic Ocean via the Rance estuary. This coastal region supports diverse aquatic life, including migratory fish species such as Atlantic salmon and sea trout. The advanced treatment level helps minimize nutrient loading and protects the ecological integrity of the downstream estuary and marine environment.
Frequently asked questions
SAINT GILLES 35 is located at Le Haut Vivier, Saint-Gilles, in the Ille-et-Vilaine department of Bretagne, France. It serves the Saint-Gilles commune within the Rennes metropolitan area.
The plant serves approximately 4,100 people, classifying it as a small agglomeration under EU classification. It is designed to handle a capacity of 3,500 m³/day.
The plant discharges treated effluent into the local watershed, which flows into the Vilaine River basin and ultimately reaches the Atlantic Ocean via the Rance estuary. The advanced treatment ensures high-quality effluent.
As a French plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations over 2,000 people. The plant's advanced treatment exceeds this standard.
For small agglomerations (2,000-10,000 people) in France, secondary treatment is the minimum requirement under EU directives. Many plants, like SAINT GILLES 35, implement advanced treatment to better protect sensitive receiving waters.
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