THOISSEY Mogneneins Wastewater Treatment Plant, Auvergne-Rhône-Alpes, France

THOISSEY Mogneneins is an advanced wastewater treatment plant located in Mogneneins, a commune in the Ain department of the Auvergne-Rhône-Alpes region in eastern France. The plant serves a population of approximately 2,812 residents and is part of the municipal wastewater infrastructure for the local community. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 8,000 m³/day and an actual discharge volume of 501.66 m³/day, the plant operates well below its capacity, indicating room for future growth. As a French facility, it operates under the national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment levels based on the size of the agglomeration and the sensitivity of the receiving environment. The treated effluent is discharged into the local watershed, which ultimately drains into the Saône River, a major tributary of the Rhône River. The Rhône flows into the Mediterranean Sea, making this plant part of a large and ecologically significant river basin. The advanced treatment helps protect downstream water quality and aquatic ecosystems in the Saône and Rhône rivers.

The plant discharges into the local watershed that feeds the Saône River, a major tributary of the Rhône River. The Rhône flows into the Mediterranean Sea, supporting diverse aquatic life and important migratory corridors. The advanced treatment level helps minimize nutrient loading and protects downstream water quality in this ecologically sensitive river system.