Abries nouvelle STEU Wastewater Treatment Plant, Abriès-Ristolas, France

Abries nouvelle STEU is a municipal wastewater treatment plant located in Abriès-Ristolas, in the Hautes-Alpes department of Provence-Alpes-Côte d'Azur, France. The plant serves a population of approximately 3,033 and is designed with a capacity of 3,400 m³ per day. It provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. As a secondary treatment facility, the plant employs biological processes to reduce organic matter and suspended solids. The plant's discharge volume is reported at 541.08 m³ per day, indicating it operates well below its designed capacity. This suggests the plant has room for future growth or seasonal variations in flow. The treated effluent is discharged into the local watershed, which ultimately drains into the Durance River and then the Rhône River, flowing towards the Mediterranean Sea. The plant plays a key role in protecting the water quality of the alpine streams and rivers in the region, which support diverse aquatic life and are important for tourism and recreation.

The plant discharges into the local watershed that feeds the Durance River, a major tributary of the Rhône. The Rhône flows into the Mediterranean Sea. The region is characterized by alpine ecosystems and sensitive water bodies that require protection from nutrient pollution. Secondary treatment helps reduce organic load and protect downstream aquatic habitats.