CEZY SAINT AUBIN Wastewater Treatment Plant, Saint-Aubin-sur-Yonne, Bourgogne-Franche-Comté

CEZY SAINT AUBIN is a wastewater treatment plant located in Saint-Aubin-sur-Yonne, a commune in the Yonne department of Bourgogne-Franche-Comté, France. The plant serves a population of about 3,250 people, classifying it as a small to medium agglomeration under French and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity is 3,500 m³/day, with an average daily discharge volume of approximately 580 m³, indicating ample reserve capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Yonne River, a major tributary of the Seine. This river system supports diverse aquatic life and is an important ecological corridor in the region. The plant's advanced treatment helps protect water quality in the Seine basin.

The plant discharges into the Yonne River basin, which flows into the Seine River and eventually reaches the English Channel. The Yonne River supports a variety of fish species and is part of a larger network of waterways that provide habitat for migratory birds and aquatic plants. The advanced treatment level helps reduce nutrient loading and protects downstream ecosystems.