MORMANT Wastewater Treatment Plant, Aubepierre-Ozouer-le-Repos, France

MORMANT is an advanced wastewater treatment plant located in Aubepierre-Ozouer-le-Repos, in the Seine-et-Marne department of France. It serves a population of 3,600 people, reflecting a small to medium agglomeration under French and EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the broader water management infrastructure in the Île-de-France region. 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. With a designed capacity of 6,000 m³/day and an actual discharge volume of 642.23 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. The advanced treatment level ensures high-quality effluent, reducing nutrient loads and protecting receiving water bodies. The treated effluent from MORMANT is discharged into local watercourses that eventually drain into the Seine River basin. The Seine flows through Paris and into the English Channel, supporting diverse aquatic life and providing water for agriculture and industry. The plant's advanced treatment helps maintain water quality in this ecologically sensitive region, which is subject to EU regulations on nutrient reduction and water quality standards.

The plant discharges into local streams that are part of the Seine River basin. The Seine flows through the Paris metropolitan area and eventually reaches the English Channel, supporting a variety of fish species and migratory birds. The region's water bodies are subject to eutrophication risks from nutrient pollution, making advanced treatment crucial for protecting downstream ecosystems and meeting EU Water Framework Directive goals.