MIREVAL Wastewater Treatment Plant, Mireval, Occitanie, France

The MIREVAL wastewater treatment plant is located in Mireval, a commune in the Hérault department of Occitanie, southern France. It serves a population of approximately 3,588 residents and operates with secondary treatment, which is standard for smaller agglomerations under French and EU regulations. With a designed capacity of 4,000 m³/day and an average discharge volume of 640.09 m³/day, the plant operates well below its capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, meeting the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations under 10,000 population equivalent. The plant is situated within 10 km of the Mediterranean coast, making its discharge potentially influential on coastal water quality. The treated effluent likely flows into local watercourses that drain into the Gulf of Lion, an area known for its marine biodiversity and tourism. The plant's proximity to the coast underscores the importance of effective treatment to protect sensitive marine environments.

The MIREVAL plant is located near the Mediterranean coast, within the drainage basin of the Gulf of Lion. Treated wastewater likely enters local streams or the coastal lagoon system of the Languedoc region, which supports diverse aquatic life including fish and bird species. The coastal zone is ecologically sensitive, with seagrass meadows and marine habitats that benefit from controlled nutrient inputs. Proper secondary treatment helps mitigate eutrophication risks in this semi-enclosed sea.