DUCLAIR Wastewater Treatment Plant, Duclair, Normandie, France

DUCLAIR is a wastewater treatment plant located in Duclair, a commune in the Seine-Maritime department of Normandie, France. The plant serves a population of approximately 2,700 people, classifying it as a small agglomeration under French and EU regulations. It is situated near the Seine River, which flows through the region and ultimately reaches the English Channel. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 4,000 m³/day, with an actual discharge volume of 481.68 m³/day, indicating significant spare capacity. As a French facility, it operates under national regulations transposing EU directives, with permits issued by the local water agency (Agence de l'Eau). The treated effluent is discharged into the local watershed, which drains into the Seine River. The Seine is a major waterway that flows through Paris and into the English Channel, supporting diverse aquatic life and serving as a critical resource for agriculture, industry, and recreation. The advanced treatment helps protect the Seine's water quality and downstream ecosystems, including the Seine Estuary and the Baie de Seine.

The plant discharges into the Seine River basin, which flows through Normandie and into the English Channel. The Seine Estuary is an ecologically sensitive area that supports migratory fish species and diverse bird populations. Advanced treatment at this plant helps reduce nutrient and pollutant loads, contributing to the health of the downstream marine environment.