ETE Pérola Negra Campo da Fumaça - Secondary Wastewater Treatment in Lauro de Freitas, Bahia

ETE Pérola Negra Campo da Fumaça is a municipal wastewater treatment plant located in Lauro de Freitas, a city in the metropolitan region of Salvador, Bahia, Brazil. The plant serves a population of approximately 28,236 people, placing it in the medium-agglomeration category under Brazilian sanitation standards. The plant provides secondary treatment, which is the minimum required by Brazilian regulations (CONAMA Resolution 430/2011) for most inland and coastal discharges. The plant operates under Brazil's national sanitation framework, which mandates compliance with effluent quality standards for biological oxygen demand and suspended solids. The treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the Baía de Todos os Santos, a large tropical bay. This coastal environment supports diverse marine life, including mangroves and coral reefs, making proper treatment essential for protecting downstream ecosystems.

The plant discharges into the Baía de Todos os Santos watershed, a major coastal bay in northeastern Brazil that flows into the Atlantic Ocean. This bay is ecologically sensitive, supporting mangroves, seagrass beds, and diverse fish and crustacean populations. The proximity to the coast (within 10 km) means that treated effluent can influence nearshore water quality, requiring effective secondary treatment to minimize nutrient and pathogen loads.