Overview
OLONZAC wastewater treatment plant serves Olonzac, Occitanie, France. It provides advanced treatment for a population of 1,900 with a designed capacity of 2,500 m³/day.
The OLONZAC wastewater treatment plant is located in Olonzac, a commune in the Hérault department of Occitanie, southern France. It serves a population of approximately 1,900 residents, reflecting its role as a small-scale municipal facility in a rural setting. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity of 2,500 m³/day accommodates current flows, with a reported discharge volume of 338.96 m³/day indicating operational headroom. Treated effluent is discharged into the local watershed, which ultimately drains into the Mediterranean Sea via the Aude River system. The plant's advanced treatment helps protect downstream water quality in this ecologically sensitive region, supporting aquatic life and recreational uses.
Environmental context
The plant discharges into the Aude River basin, which flows into the Mediterranean Sea near Narbonne. This coastal region supports diverse marine and freshwater ecosystems, including seagrass meadows and fish spawning grounds. Advanced treatment reduces nutrient loads, mitigating eutrophication risks in the sensitive lagoon environments of the Languedoc coast.
Frequently asked questions
The plant is located at Chemin des Arques, Olonzac, in the Hérault department of Occitanie, southern France.
The plant serves approximately 1,900 residents in the commune of Olonzac and surrounding areas.
The plant provides advanced treatment, which includes nutrient removal beyond secondary treatment standards.
Under the EU UWWTD, agglomerations under 2,000 population equivalent require appropriate treatment. OLONZAC's advanced treatment exceeds the directive's minimum requirements for its size.
The plant has a designed capacity of 2,500 m³ per day, with a current discharge volume of about 339 m³ per day.
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