MELISEY Wastewater Treatment Plant, Mélisey, Bourgogne-Franche-Comté, France

MELISEY is a wastewater treatment plant located in Mélisey, a commune in the Haute-Saône department of Bourgogne-Franche-Comté, France. The plant serves a population of approximately 2,033 and is part of the region's municipal wastewater infrastructure. It operates under French regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant employs advanced treatment processes, which go beyond the secondary treatment standard required for agglomerations of this size under the directive. Its designed capacity is 2,800 m³ per day, with an average discharge volume of 362.68 m³ per day, indicating ample reserve capacity for future growth or peak flows. The treated effluent is discharged into local watercourses that ultimately drain into the Saône River basin, a major tributary of the Rhône. This contributes to the protection of downstream aquatic ecosystems and supports water quality in the Rhône-Mediterranean watershed.

The plant discharges into the local watershed, which is part of the Saône River basin. The Saône flows south to join the Rhône near Lyon, eventually reaching the Mediterranean Sea. The region supports diverse aquatic life, including fish species such as brown trout and grayling, and the plant's advanced treatment helps maintain water quality in this ecologically sensitive area.