MOLLEGES Wastewater Treatment Plant, Mollégès, Provence-Alpes-Côte d'Azur

MOLLEGES is a wastewater treatment plant located in Mollégès, a commune in the Bouches-du-Rhône department of Provence-Alpes-Côte d'Azur, France. The plant serves a population of approximately 3,123 and has a designed capacity of 2,500 cubic meters per day, with an average discharge volume of 557.14 cubic meters per day. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the standard requirement under the EU directive for agglomerations of this size (between 2,000 and 10,000 population equivalent). Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's capacity utilization is well within its design limits, indicating operational efficiency. The treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea via the Rhône River delta. The region is part of the Camargue, a vast wetland area known for its ecological significance, supporting diverse bird species and aquatic life. The plant plays a key role in protecting this sensitive environment from nutrient pollution and pathogens.

The plant discharges into the local water system that flows into the Rhône River, which then reaches the Mediterranean Sea via the Camargue delta. The Camargue is a critical wetland ecosystem, supporting migratory birds, flamingos, and diverse aquatic species. Secondary treatment helps reduce organic load and nutrients, mitigating eutrophication risks in the downstream coastal environment.