Overview
Arras St Laurent Blangy wastewater treatment plant serves over 104,000 people in Saint-Laurent-Blangy, Hauts-de-France, France. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of t
The Arras St Laurent Blangy wastewater treatment plant is located in Saint-Laurent-Blangy, a commune in the Pas-de-Calais department of Hauts-de-France, northern France. It serves a population of approximately 104,183, classifying it as a large agglomeration under EU regulations. The plant is part of the municipal wastewater infrastructure for the Arras urban area. As a facility serving over 100,000 people, it falls under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary biological treatment for all discharges from agglomerations of this size. In sensitive areas, tertiary treatment may also be mandated. The regulatory framework ensures a high standard of treatment. The plant discharges treated wastewater into the local water system, which ultimately drains into the Scarpe River and then the Scheldt basin, flowing toward the North Sea. This river system supports diverse aquatic life and is an important ecological corridor in the region. The plant's operation helps protect downstream water quality and the broader marine environment.
Environmental context
The plant's treated effluent enters the Scarpe River, a tributary of the Scheldt, which flows through northern France and Belgium before reaching the North Sea. This watershed supports a variety of freshwater species and is used for agriculture and recreation. The Scheldt estuary is an ecologically sensitive area that provides habitat for migratory birds and fish. Proper wastewater treatment is essential to prevent nutrient pollution and maintain water quality in this transboundary river basin.
Frequently asked questions
The plant is located in Saint-Laurent-Blangy, a commune in the Pas-de-Calais department of Hauts-de-France, northern France. It serves the Arras urban area.
The plant serves a population of approximately 104,183 people, classifying it as a large agglomeration under EU regulations.
The plant discharges treated wastewater into the Scarpe River, which flows into the Scheldt basin and eventually reaches the North Sea.
As a plant serving over 100,000 people, it is classified as a large agglomeration under the EU UWWTD (91/271/EEC), which requires secondary treatment and, in sensitive areas, tertiary treatment to protect water quality.
In France, plants of this scale typically employ secondary biological treatment, often with nutrient removal, to meet EU standards. Some may also include tertiary treatment if discharging into sensitive areas.
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