MARNAY NOUVELLE Wastewater Treatment Plant, Marnay, France

MARNAY NOUVELLE is an advanced wastewater treatment plant located in Marnay, a commune in the Haute-Saône department of Bourgogne-Franche-Comté, France. Serving a population of 2,174, the plant is designed to handle a capacity of 3,333 m³/day, with a current discharge volume of 387.84 m³/day. As an advanced treatment facility, it provides a higher level of pollutant removal than secondary treatment, ensuring compliance with stringent environmental standards. The plant operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment for agglomerations of this size. For small agglomerations like Marnay (under 10,000 population equivalent), the directive mandates secondary treatment, but the plant's advanced status indicates it goes beyond this baseline, likely incorporating nutrient removal or other tertiary processes to protect sensitive receiving waters. The treated effluent from MARNAY NOUVELLE is discharged into local waterways that ultimately drain into the Saône River, a major tributary of the Rhône. The Rhône flows into the Mediterranean Sea, making the plant's performance critical for downstream water quality. The advanced treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in the Rhône delta and coastal zones.

The plant discharges into the local watershed of the Ognon River, a tributary of the Saône River. The Saône joins the Rhône near Lyon, and the Rhône flows into the Mediterranean Sea via the Camargue delta. This downstream chain supports diverse aquatic ecosystems, including fish spawning grounds and migratory bird habitats. Advanced treatment at MARNAY NOUVELLE helps minimize nutrient and pollutant loads, protecting these ecologically sensitive areas from eutrophication and contamination.