Overview
GUEMENE PENFAO 1 Callac is a secondary treatment plant serving 2,300 people in Guémené-Penfao, Pays de la Loire, France. It discharges treated wastewater into the local watershed, ultimately flowing to the Atlantic Ocean.
GUEMENE PENFAO 1 Callac is a municipal wastewater treatment plant located in Guémené-Penfao, a commune in the Loire-Atlantique department of Pays de la Loire, France. The plant serves a population of approximately 2,300 and is situated inland, more than 10 km from the coast but within 50 km. As a secondary treatment facility, the plant meets the standard requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for populations between 2,000 and 10,000 in normal areas, which this plant fulfills. Its designed capacity is 2,250 m³/day, with a current discharge volume of 410.32 m³/day, indicating ample reserve capacity. The treated effluent is discharged into local watercourses that drain into the Vilaine River basin, eventually reaching the Atlantic Ocean. The plant plays a key role in protecting the region's water quality, supporting aquatic life in the downstream rivers and contributing to the ecological health of the coastal zone.
Environmental context
The plant discharges into the local watershed, which is part of the Vilaine River basin. The Vilaine flows into the Atlantic Ocean at the Morbihan coast, an area known for its diverse marine and estuarine ecosystems. The region supports migratory fish species and important bird habitats along the coastal wetlands. Effective treatment at this plant helps reduce nutrient loads and protect downstream water quality.
Frequently asked questions
The plant is located at D 15, Bellevue, Le Bas Guémé, Guémené-Penfao, in the Loire-Atlantique department of Pays de la Loire, France.
The plant serves a population of approximately 2,300 people in the Guémené-Penfao area.
The treated wastewater is discharged into local watercourses that are part of the Vilaine River basin, which flows into the Atlantic Ocean.
The plant provides secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive for agglomerations of this size.
In France, wastewater treatment plants operate under the EU Urban Waste Water Treatment Directive (91/271/EEC), transposed into national law. For agglomerations between 2,000 and 10,000 population equivalent, secondary treatment is mandatory unless the receiving waters are designated as sensitive areas.
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