CAYENNE STADE VIDAL Wastewater Treatment Plant, Remire-Montjoly, French Guiana

CAYENNE STADE VIDAL is a wastewater treatment plant located in Remire-Montjoly, near Cayenne, in the French overseas department of French Guiana. The plant serves a small population of 700 people and is situated within 10 km of the Atlantic coast, reflecting the coastal nature of the region. The plant provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. With a designed capacity of 680 m³/day and an actual discharge volume of 124.88 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean. The coastal environment of French Guiana is ecologically sensitive, supporting mangrove forests and diverse marine life. The plant's secondary treatment helps reduce organic pollutants and protect the receiving waters from eutrophication and other impacts.

The plant discharges into the coastal watershed of French Guiana, which flows into the Atlantic Ocean. The region is characterized by extensive mangrove ecosystems and estuaries that serve as critical nursery habitats for fish and crustaceans. The secondary treatment process reduces biochemical oxygen demand and suspended solids, helping to maintain water quality in the sensitive coastal zone.