Les Ormes-sur-Voulzie Wastewater Treatment Plant - Advanced Treatment in Seine-et-Marne

The Les Ormes-sur-Voulzie wastewater treatment plant is located in the commune of Les Ormes-sur-Voulzie, in the Seine-et-Marne department of northern France. It serves a population of approximately 1,930 residents, placing it in the small agglomeration category under French and EU regulations. The plant employs advanced treatment processes, which go beyond the secondary treatment 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 of 344.31 m³/day, indicating ample reserve capacity. The treated effluent is discharged into the Voulzie River, a tributary of the Seine. The Seine basin supports diverse aquatic life and is an important ecological corridor in the Île-de-France region. The plant's advanced treatment helps protect downstream water quality in the Seine and ultimately the English Channel.

The plant discharges into the Voulzie River, which flows into the Seine River and eventually reaches the English Channel. The Seine basin is a densely populated and agriculturally intensive region, making nutrient removal critical to prevent eutrophication. The advanced treatment at this plant helps reduce the ecological impact on the river's aquatic ecosystems.