MISSIRIAC Bief de Beaumont Wastewater Treatment Plant, Saint-Congard, Bretagne

MISSIRIAC Bief de Beaumont is a wastewater treatment plant located in Saint-Congard, in the Bretagne region of France. The plant serves a population of approximately 64,625 people, classifying it as a medium-to-large agglomeration under EU classification. It is situated near the Canal de Nantes à Brest, a historic waterway that connects the Loire River to the Atlantic coast. As a French plant serving over 10,000 population equivalent, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which mandates secondary treatment as a minimum standard. For agglomerations of this size, the directive also requires appropriate treatment to meet quality standards for receiving waters. The plant's designed capacity is 1. 00 (likely in thousands of cubic meters per day), indicating a facility sized for its service population. The plant discharges treated effluent into the local watershed, which ultimately drains into the Atlantic Ocean via the Vilaine River or the Gulf of Morbihan. The surrounding region includes sensitive coastal and estuarine environments that benefit from regulated wastewater treatment. Proper treatment helps protect aquatic ecosystems and supports water quality for recreational and economic activities in Bretagne.

The plant's treated effluent enters the local hydrographic network, likely flowing into the Oust River or a tributary of the Vilaine River, which drains into the Atlantic Ocean via the Morbihan Gulf. This coastal region supports diverse marine life, including seagrass beds and migratory fish species. The area is ecologically sensitive due to its estuarine habitats and proximity to the Gulf of Morbihan, a semi-enclosed sea with limited water exchange. Effective wastewater treatment is crucial to prevent nutrient enrichment and maintain water quality in these vulnerable coastal ecosystems.