Lorrain Bourg Wastewater Treatment Plant, Le Lorrain, Martinique

Lorrain Bourg is a municipal wastewater treatment plant located in Le Lorrain, a commune on the Atlantic coast of Martinique, an overseas region of France. The plant serves a population of approximately 2,500 residents, reflecting a small-scale agglomeration typical of rural coastal communities in the Caribbean. The facility provides secondary treatment, which is the standard biological process required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for discharges into coastal waters. With a designed capacity of 2,000 m³/day and an average daily flow of about 445 m³, the plant operates well below its capacity, indicating room for future growth or seasonal variations. Treated effluent is discharged into the Atlantic Ocean via a coastal outfall. The surrounding marine environment supports coral reefs and seagrass beds, which are sensitive to nutrient loading. The plant's secondary treatment helps reduce organic pollutants, but advanced nutrient removal is not in place, which is common for small coastal plants in tropical island settings.

The plant discharges into the Atlantic Ocean near the northeastern coast of Martinique. The coastal waters in this area are part of the Caribbean Sea ecosystem, which supports diverse marine life including coral reefs and fish populations. Nutrient inputs from wastewater can contribute to eutrophication and algal blooms, potentially affecting nearshore habitats. The plant's secondary treatment reduces biochemical oxygen demand and suspended solids, but does not specifically target nitrogen or phosphorus removal.