Overview
STEP de GRAND BOIS is a secondary treatment plant serving Saint-Pierre, La Réunion, France. It treats wastewater for approximately 2,106 people with a designed capacity of 1,667 m³/day.
STEP de GRAND BOIS is a municipal wastewater treatment plant located in the Grands-Bois district of Saint-Pierre, on the island of La Réunion, an overseas department of France. The plant serves a population of approximately 2,106 residents, reflecting its role in managing domestic wastewater for a small community within the urban area of Saint-Pierre. The plant provides secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological oxidation and sedimentation to reduce organic matter and suspended solids. The plant has a designed capacity of 1,667 m³/day, with a current discharge volume of 375.71 m³/day, indicating operational headroom. The treated effluent is discharged into the local watershed, which ultimately drains into the Indian Ocean. La Réunion's tropical climate and mountainous terrain create sensitive coastal ecosystems, including coral reefs and lagoons, that benefit from proper wastewater treatment to prevent nutrient pollution and protect marine biodiversity.
Environmental context
The plant discharges into the drainage network of southern La Réunion, which flows into the Indian Ocean. The island's coastal waters support diverse marine life, including coral reefs and seagrass beds, which are sensitive to nutrient enrichment and pollution. Effective secondary treatment helps mitigate impacts on these ecosystems, preserving water quality for recreational use and aquatic habitats.
Frequently asked questions
STEP de GRAND BOIS is located in the Grands-Bois district of Saint-Pierre, on the island of La Réunion, an overseas department of France. The address is near the Pump Track and BMX Race track on Avenue du Général de Gaulle.
The plant serves approximately 2,106 people, making it a small agglomeration under the EU Urban Waste Water Treatment Directive.
The treated effluent is discharged into the local watershed, which ultimately flows into the Indian Ocean. The plant's secondary treatment process reduces organic matter and suspended solids before discharge.
As a French plant in an EU overseas department, STEP de GRAND BOIS operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size.
For small agglomerations in France, secondary treatment is standard, often using activated sludge or biological filters. The EU directive mandates secondary treatment for all discharges from agglomerations above 2,000 population equivalent.
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