Overview
PARIS Seine centre is a major wastewater treatment plant serving over 1 million people in Colombes, Île-de-France, France. It treats wastewater from the Paris metropolitan area before discharging into the Seine River.
PARIS Seine centre is a large wastewater treatment plant located in Colombes, a northwestern suburb of Paris, in the Île-de-France region of France. The plant serves a population of approximately 1,018,480 people, making it one of the largest treatment facilities in the Paris metropolitan area. It plays a critical role in managing the wastewater generated by the densely populated urban and suburban zones of the French capital. As a major agglomeration exceeding 150,000 population equivalent, the plant operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which mandates advanced treatment (tertiary) for sensitive areas like the Seine River basin. The Seine is a designated sensitive area due to eutrophication risks, requiring nutrient removal (nitrogen and phosphorus) in addition to secondary biological treatment. The treated effluent is discharged into the Seine River, which flows through Paris and eventually into the English Channel via the Seine estuary. The Seine basin supports diverse aquatic life and is an important ecological corridor for migratory fish species. The plant's operations are crucial for maintaining water quality in the Seine, especially downstream of Paris, where the river passes through agricultural and industrial areas before reaching the coast.
Environmental context
The plant discharges into the Seine River, which flows northwest through Paris and the Île-de-France region before reaching the Seine estuary and the English Channel. The Seine basin is a sensitive ecosystem subject to eutrophication from nutrient pollution, requiring advanced treatment to reduce nitrogen and phosphorus loads. Downstream, the river supports diverse aquatic habitats and is a key migratory route for Atlantic salmon and eels. The estuary and coastal waters are important for marine biodiversity and commercial fisheries.
Frequently asked questions
PARIS Seine centre is located in Colombes, a northwestern suburb of Paris, in the Île-de-France region of France. The address is Chemin de Halage, 92700 Colombes.
The treated effluent from PARIS Seine centre is discharged into the Seine River, which flows through Paris and eventually reaches the English Channel via the Seine estuary.
PARIS Seine centre protects the Seine River and its downstream ecosystems, including the Seine estuary and the coastal waters of the English Channel.
As a plant serving over 150,000 population equivalent, PARIS Seine centre is classified as a 'large agglomeration' under the EU Urban Waste Water Treatment Directive (91/271/EEC). It is required to provide tertiary treatment, including nutrient removal, because the Seine River is a sensitive area prone to eutrophication.
For large agglomerations in France, typical treatment includes primary settling, activated sludge biological treatment with nitrogen and phosphorus removal, and sometimes tertiary filtration or disinfection. This meets the requirements of the EU Urban Waste Water Treatment Directive for sensitive areas.
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