ROGNONAS Wastewater Treatment Plant, Rognonas, Provence-Alpes-Côte d'Azur

ROGNONAS is a wastewater treatment plant located in Rognonas, a commune in the Bouches-du-Rhône department of Provence-Alpes-Côte d'Azur, France. The plant serves a population of 4,629 and operates with secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. The plant has a designed capacity of 4167 m³/day and discharges a volume of 825.81 m³/day. As a facility in France, ROGNONAS operates under the national implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC). For a population of approximately 4,600, secondary treatment is typically sufficient unless the receiving waters are designated as sensitive areas, which would require more advanced treatment. The plant's capacity utilization is around 20%, indicating ample reserve capacity. The treated effluent from ROGNONAS is discharged into the local watershed, which ultimately drains into the Rhône River. The Rhône is a major European river that flows into the Mediterranean Sea. The plant plays a role in protecting the water quality of the Rhône basin and the downstream coastal environment, supporting aquatic life and reducing nutrient loads.

ROGNONAS discharges into the Rhône River basin, which flows southward through Provence and into the Mediterranean Sea near the Camargue delta. The Rhône is a major river supporting diverse aquatic ecosystems and is an important migratory corridor for fish. The plant's secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality in the Mediterranean coastal zone.