PIOLENC Wastewater Treatment Plant, Piolenc, Provence-Alpes-Côte d'Azur

The PIOLENC wastewater treatment plant is located in Piolenc, a commune in the Vaucluse department of Provence-Alpes-Côte d'Azur, France. It serves a population of approximately 4,700 residents, classifying it as a small to medium agglomeration under EU regulations. The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size discharging into freshwater. The designed capacity is 5,200 m³/day, and the current discharge volume is 838.47 m³/day, indicating operational headroom. Treated effluent is discharged into the local watershed, which ultimately drains into the Rhône River, a major European waterway flowing into the Mediterranean Sea. The plant plays a key role in protecting the Rhône basin and downstream coastal ecosystems from nutrient pollution.

The plant discharges into the Rhône River basin, which flows southward through Provence and into the Mediterranean Sea near the Camargue delta. This region supports diverse aquatic life and migratory fish species. The Rhône is a major source of freshwater for the Mediterranean, and nutrient management is critical to prevent eutrophication in coastal waters.