PREMANON2 Wastewater Treatment Plant, Prémanon, France

PREMANON2 is an advanced wastewater treatment plant located in Prémanon, a commune in the Jura department of Bourgogne-Franche-Comté, France. The plant serves a population of 2,600 and has a designed capacity of 5,100 m³/day, with a current discharge volume of 463.84 m³/day. It is situated inland, more than 10 km from the coast, and operates under French regulations transposing the EU Urban Waste Water Treatment Directive. As an advanced treatment facility, PREMANON2 goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants in sensitive areas or those discharging into ecologically valuable water bodies. The plant's capacity utilization is low, indicating it has room to accommodate future growth or seasonal variations in flow. The treated effluent from PREMANON2 is discharged into the local watershed, which ultimately drains into the Rhône River basin via the Bienne River and the Ain River. This region is known for its karst landscapes and rich biodiversity, including protected fish species and aquatic habitats. The advanced treatment helps protect downstream water quality in the Rhône and its delta.

PREMANON2 discharges into the local watershed that feeds the Bienne River, a tributary of the Ain River, which flows into the Rhône River. The Rhône eventually reaches the Mediterranean Sea. The Jura region is characterized by limestone geology and sensitive aquatic ecosystems, including populations of European bullhead and brook lamprey. Advanced treatment at this plant helps reduce nutrient loading and protects downstream water quality in the Rhône basin.