Overview
Evry Centre CAECE is a wastewater treatment plant serving Évry, France, with a population equivalent of 157,600. It operates under the EU Urban Waste Water Treatment Directive, ensuring compliance with secondary treatment standards.
Evry Centre CAECE is a wastewater treatment plant located in Évry, Essonne, within the Île-de-France region. Serving a population equivalent of 157,600, it is classified as a large agglomeration under EU regulations. The plant is situated in the metropolitan area of Paris, a densely populated urban region with significant industrial and residential wastewater demands. As a large agglomeration, the plant is required to meet the standards of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for all discharges and tertiary treatment in sensitive areas. The Seine River basin, where Évry is located, is designated as a sensitive area due to eutrophication risks, necessitating advanced nutrient removal. The plant's treatment processes are designed to comply with these stringent requirements, protecting water quality in the downstream environment. The treated effluent from Evry Centre CAECE is discharged into the Seine River, which flows through Paris and eventually into the English Channel. The Seine supports diverse aquatic life and is a critical resource for drinking water, recreation, and agriculture. The plant plays a vital role in maintaining the ecological health of the river and its estuary, reducing nutrient loads and preventing algal blooms.
Environmental context
Evry Centre CAECE discharges into the Seine River, which flows through the Paris metropolitan area and into the Seine Bay, part of the English Channel. The Seine basin is a sensitive area under the EU Urban Waste Water Treatment Directive, requiring nutrient removal to prevent eutrophication. The river supports a variety of fish species and is an important migratory corridor for eels and salmon. Downstream, the estuary provides critical habitat for birds and marine life, making effective wastewater treatment essential for regional biodiversity.
Frequently asked questions
Evry Centre CAECE is located in Évry, Essonne, in the Île-de-France region of France, approximately 30 kilometers south of Paris.
The plant serves a population equivalent of 157,600, classifying it as a large agglomeration under EU regulations.
The treated effluent is discharged into the Seine River, which flows through Paris and into the English Channel.
As a large agglomeration serving over 150,000 people, the plant must comply with the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment and, in sensitive areas like the Seine basin, tertiary treatment for nutrient removal.
In France, plants of this scale typically employ activated sludge processes with biological nutrient removal to meet stringent discharge standards for nitrogen and phosphorus, as required by the EU directive for sensitive areas.
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