SEIGNELAY Wastewater Treatment Plant, Seignelay, Bourgogne-Franche-Comté

The SEIGNELAY wastewater treatment plant is located in the commune of Seignelay, within the Yonne department of Bourgogne-Franche-Comté, France. It serves a population of approximately 1,426 residents and operates with a designed capacity of 2,400 cubic meters per day, with an average discharge volume of 254.4 m³/day. The plant provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to remove organic matter and suspended solids, ensuring compliance with European effluent standards. The treated wastewater is discharged into the local watershed, which ultimately drains into the Yonne River, a tributary of the Seine. The Seine River flows through Paris and into the English Channel, making the plant's operations important for downstream water quality and the ecological health of the Seine basin.

The SEIGNELAY plant discharges into the Yonne River basin, which feeds into the Seine River and eventually the English Channel. The Seine basin supports diverse aquatic life and is a critical water resource for the region. The plant's secondary treatment helps protect downstream ecosystems from organic pollution and nutrient loading, contributing to the overall health of the Seine estuary and coastal waters.