Lumio Wastewater Treatment Plant, Sant'Ambroggio, Corsica | Secondary Treatment

The Lumio wastewater treatment plant is located in Sant'Ambroggio, a coastal area in the commune of Lumio, Haute-Corse, Corsica, France. It serves a population of approximately 3,632 people, classifying it as a small agglomeration under EU regulations. The plant provides secondary treatment, which is the minimum required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into coastal waters. With a designed capacity of 6,000 cubic meters per day and an actual discharge volume of about 648 cubic meters per day, the plant operates well below its capacity, indicating room for future growth. As a coastal facility within 10 km of the Mediterranean Sea, the plant's secondary treatment level aligns with EU standards for sensitive areas, though tertiary treatment may be required if the receiving waters are designated as sensitive. The treated effluent is discharged into the coastal waters of the Mediterranean Sea, which supports diverse marine life and is an important ecological and economic resource for Corsica. The plant plays a key role in protecting the local marine environment from untreated wastewater, contributing to the preservation of water quality in the Gulf of Calvi and surrounding areas.

The plant discharges treated wastewater into the Mediterranean Sea near the Gulf of Calvi, a coastal area known for its clear waters and marine biodiversity. The receiving waters support seagrass meadows and fish nurseries, making them ecologically sensitive. The plant's secondary treatment helps reduce nutrient loads and organic pollution, protecting the local marine ecosystem and supporting tourism and fisheries in the region.