Overview
Villefranche-sur-Saône wastewater treatment plant serves over 108,000 people in Auvergne-Rhône-Alpes, France. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this scale.
The Villefranche-sur-Saône wastewater treatment plant is a major municipal facility located in the Auvergne-Rhône-Alpes region of eastern France. Serving a population of over 108,000, it is classified as a large agglomeration under EU regulations. The plant is situated near the Saône River, a key tributary of the Rhône, and plays a critical role in protecting the regional water environment. As a facility serving more than 100,000 people, it falls under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment, including nutrient removal, for discharges into sensitive areas. The plant's treatment processes are designed to meet stringent standards for biological oxygen demand, suspended solids, and nutrients, ensuring compliance with French and EU regulations. The treated effluent is discharged into the Saône River, which flows south to join the Rhône near Lyon. The Rhône then continues to the Mediterranean Sea. This discharge supports the ecological health of the Saône and Rhône rivers, which are important for aquatic biodiversity, including fish species such as the European eel and various migratory fish. The plant's operation is essential for maintaining water quality in this densely populated and agriculturally active region.
Environmental context
The plant discharges into the Saône River, a major tributary of the Rhône, which ultimately flows into the Mediterranean Sea. The Saône-Rhône corridor is an ecologically significant waterway supporting diverse aquatic life, including migratory fish species. The region's watershed is influenced by agricultural runoff and urban development, making the plant's nutrient removal critical to preventing eutrophication in downstream waters.
Frequently asked questions
The plant is located in Villefranche-sur-Saône, in the Auvergne-Rhône-Alpes region of eastern France, near the Saône River.
The plant serves a population of approximately 108,676 people, classifying it as a large agglomeration under EU regulations.
The treated effluent is discharged into the Saône River, which flows into the Rhône and eventually reaches the Mediterranean Sea.
As a French plant serving over 100,000 people, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment and, in sensitive areas, tertiary treatment for nutrient removal.
For large agglomerations in France, typical treatment includes primary sedimentation, biological secondary treatment (activated sludge), and often tertiary treatment for phosphorus and nitrogen removal to meet EU standards.
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