AUXERRE Appoigny Wastewater Treatment Plant, Appoigny, Bourgogne-Franche-Comté

AUXERRE Appoigny is a wastewater treatment plant located in Appoigny, a commune in the Yonne department of Bourgogne-Franche-Comté, France. Serving an estimated population of 76,511, the plant is a key component of the region's sanitation infrastructure, handling wastewater from the Auxerre metropolitan area. As a French facility serving over 15,000 population equivalent, the plant is classified as a 'large agglomeration' under the EU Urban Waste Water Treatment Directive (91/271/EEC). This directive mandates secondary biological treatment as a minimum, with tertiary treatment required if the receiving waters are designated as sensitive areas. The plant's treatment processes are designed to meet these stringent European standards. The treated effluent is discharged into the Yonne River, a major tributary of the Seine. The Yonne flows northward through Burgundy and joins the Seine near Montereau-Fault-Yonne, eventually reaching the English Channel via the Seine estuary. This connection underscores the plant's role in protecting downstream aquatic ecosystems and the broader Seine basin.

The plant discharges into the Yonne River, which flows into the Seine River and ultimately the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor. The Yonne River is subject to EU water quality standards, requiring advanced treatment to minimize nutrient loading and protect downstream habitats.