PLERGUER Wastewater Treatment Plant, Plerguer, Bretagne, France

PLERGUER is a wastewater treatment plant located in Plerguer, a commune in the Ille-et-Vilaine department of Bretagne, France. The plant serves a population of approximately 2,600 and has a designed capacity of 4,300 m³/day, with a current discharge volume of 463.84 m³/day. It is situated near the coast, within 10 km of the shoreline. 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant's capacity utilization is low, indicating ample headroom for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the English Channel via the Rance River or nearby coastal waters. The region's coastal and estuarine environments are ecologically sensitive, supporting diverse marine life and migratory bird populations. The plant's advanced treatment helps minimize nutrient loading and protect water quality in this important coastal zone.

The plant discharges into the local watershed that feeds into the Rance River estuary and the English Channel. This coastal area supports diverse aquatic ecosystems, including seagrass beds and shellfish habitats, which are sensitive to nutrient pollution. Advanced treatment at PLERGUER reduces nitrogen and phosphorus loads, helping to prevent eutrophication and maintain water quality in downstream marine environments.