Overview
NANTES 1 Tougas is a major wastewater treatment plant in Saint-Herblain, France, serving over 500,000 people. It operates under the EU Urban Waste Water Treatment Directive, ensuring high environmental standards for the Loire-Atlantique region.
NANTES 1 Tougas is a large-scale wastewater treatment plant located in Saint-Herblain, within the Nantes metropolitan area in the Pays de la Loire region of France. Serving a population of over 500,000, it is a critical component of the region's sanitation infrastructure, handling wastewater from a densely populated urban and industrial zone. As a facility serving a population equivalent exceeding 150,000, NANTES 1 Tougas falls under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment (tertiary or nutrient removal) for discharges into sensitive areas. The plant's designed capacity is 1.00 unit, indicating its substantial scale. The regulatory framework ensures compliance with stringent effluent standards to protect receiving waters. The plant discharges treated wastewater into the Loire River, which flows through Nantes and eventually reaches the Atlantic Ocean near Saint-Nazaire. The Loire is a major European river with significant ecological value, supporting diverse aquatic life and serving as a migratory corridor for species such as Atlantic salmon and European eel. The plant's operations are crucial for maintaining water quality in this dynamic river system and the downstream estuarine environment.
Environmental context
NANTES 1 Tougas discharges into the Loire River, which flows westward through the Loire-Atlantique department and empties into the Bay of Biscay (Atlantic Ocean) via the Loire estuary. The estuary is a ecologically sensitive area that supports diverse habitats, including mudflats, salt marshes, and reed beds, which are vital for migratory birds and fish. The plant's nutrient removal performance is critical to prevent eutrophication in the coastal zone, where the river plume influences marine productivity.
Frequently asked questions
NANTES 1 Tougas is located in Saint-Herblain, a suburb of Nantes in the Loire-Atlantique department of the Pays de la Loire region, France. Its address is Quai Émile Cormerais, Zone Industrielle de la Loire, Bernardière, Saint-Herblain.
The plant serves a population of 504,517 people, making it a large agglomeration under the EU Urban Waste Water Treatment Directive.
The plant discharges treated effluent into the Loire River, which flows through Nantes and eventually reaches the Atlantic Ocean via the Loire estuary.
As a French plant serving over 150,000 people, NANTES 1 Tougas operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment (tertiary or nutrient removal) for discharges into sensitive areas like the Loire estuary.
For large agglomerations in France, the EU UWWTD mandates secondary treatment as a minimum, and often tertiary treatment (e. g. , nitrogen and phosphorus removal) is required to protect sensitive water bodies. Plants of this scale typically employ activated sludge processes with nutrient removal.
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