Overview
Le Bois Noir wastewater treatment plant serves Landerneau, France, in the Bretagne region. It treats wastewater for approximately 29,000 people and is located near the Élorn River.
Le Bois Noir is a wastewater treatment plant located in Landerneau, within the Bretagne region of France. The facility serves a population of approximately 29,000 residents, making it a medium-sized agglomeration under European Union classification. The plant is situated near the Élorn River, which flows through the town and ultimately reaches the Atlantic Ocean. As a French wastewater treatment facility, Le Bois Noir operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas. The plant's designed capacity is 1.00 cubic meters per day, indicating a relatively small facility. The treated effluent from Le Bois Noir is discharged into the Élorn River, which flows into the Rade de Brest, a large natural harbor on the Atlantic coast. This water body supports diverse aquatic life and is an important ecological corridor for migratory fish species. The plant's location within 50 kilometers of the coast underscores the importance of effective treatment to protect marine water quality.
Environmental context
Le Bois Noir discharges treated wastewater into the Élorn River, which flows into the Rade de Brest, a coastal estuary on the Atlantic Ocean. The Rade de Brest supports diverse marine life, including shellfish beds and migratory fish such as salmon and sea trout. Protecting this downstream environment requires effective nutrient removal to prevent eutrophication in the coastal zone.
Frequently asked questions
Le Bois Noir is located in Landerneau, in the Bretagne region of France, near the Élorn River.
The plant serves approximately 29,000 people, classifying it as a medium-sized agglomeration under EU standards.
Treated effluent from Le Bois Noir is discharged into the Élorn River, which flows into the Rade de Brest and eventually the Atlantic Ocean.
As a French plant, Le Bois Noir operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size and potentially tertiary treatment if the receiving waters are sensitive.
Under the EU Urban Waste Water Treatment Directive, plants serving 29,000 people typically require secondary treatment (biological treatment) as a minimum, with additional nutrient removal if discharging into sensitive areas.
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