DESCARTES Ruton Wastewater Treatment Plant, Descartes, France

DESCARTES Ruton is a wastewater treatment plant located in Descartes, a commune in the Indre-et-Loire department of the Centre-Val de Loire region, France. The plant serves a population of approximately 4,697 and has a designed capacity of 5,830 cubic meters per day, with an average discharge volume of 837.94 cubic meters per day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), France requires advanced (tertiary) treatment for discharges into sensitive areas, which is consistent with the plant's treatment level. The plant's scale places it in the small-to-medium agglomeration category, for which secondary treatment is the minimum standard, but the advanced level indicates a higher environmental protection requirement. The treated effluent is discharged into the local watershed, which ultimately drains into the Loire River basin. The Loire is one of France's major rivers, flowing into the Atlantic Ocean. The plant's advanced treatment helps protect the ecological quality of the receiving waters, supporting aquatic life and downstream uses such as drinking water supply and recreation.

The plant discharges into the Creuse River, a tributary of the Vienne River, which joins the Loire River before reaching the Atlantic Ocean. The Loire basin is ecologically significant, supporting diverse fish species and migratory birds. Advanced treatment at this plant helps reduce nutrient loading, protecting downstream water quality in a region known for its agricultural activity and sensitive aquatic habitats.