Pleyben Ar Vernig Wastewater Treatment Plant, Pleyben, Bretagne

Pleyben Ar Vernig is an advanced wastewater treatment plant located in Pleyben, a commune in the Finistère department of Bretagne, France. The plant serves a population of approximately 3,500 residents, reflecting its role as a medium-sized facility for a rural community. It operates under the French regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. The plant employs advanced treatment processes, ensuring a high level of pollutant removal beyond secondary standards. With a designed capacity of 4,000 m³/day and an average discharge volume of 624.39 m³/day, the facility operates well within its capacity, indicating robust infrastructure for current demand. Advanced treatment typically includes nutrient removal, which is critical for protecting sensitive water bodies. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Aulne River and the Bay of Brest. This coastal region supports diverse aquatic ecosystems, including migratory fish species. The plant's advanced treatment helps minimize nutrient loading and protects downstream water quality in this ecologically sensitive area.

The plant discharges into the Aulne River basin, which flows into the Bay of Brest, a large marine inlet on the Atlantic coast of Brittany. The bay is an important ecological area supporting diverse marine life, including seagrass beds and shellfish populations. Advanced treatment at the plant reduces nutrient inputs, helping to prevent eutrophication in the coastal waters.