ETE Cajazeiras VII Wastewater Treatment Plant, Salvador, Bahia

ETE Cajazeiras VII is a municipal wastewater treatment plant located in Salvador, the capital of Bahia state in northeastern Brazil. The plant serves a population of approximately 3,462 residents within the Cajazeiras neighborhood, operating as part of the city's sanitation infrastructure to manage domestic sewage. The plant provides secondary treatment, which involves biological processes to reduce organic matter and suspended solids. Secondary treatment is the standard required by Brazilian regulations (CONAMA resolutions) for most urban wastewater. The plant discharges an average of 374.14 m³ of treated effluent per day. The treated effluent from ETE Cajazeiras VII ultimately reaches the Atlantic Ocean via local drainage channels and the Bay of All Saints (Baía de Todos os Santos), one of Brazil's largest coastal bays. This water body supports diverse marine life and is an important ecological and economic resource for the region, including fisheries and tourism. Proper treatment helps protect water quality in this sensitive coastal environment.

The plant discharges into the drainage network of Salvador, which flows into the Bay of All Saints (Baía de Todos os Santos), a large tropical estuary connected to the Atlantic Ocean. This bay supports mangrove ecosystems, seagrass beds, and coral reefs, providing habitat for fish, crustaceans, and migratory birds. Effective wastewater treatment is critical to prevent nutrient pollution and maintain water quality in this ecologically productive coastal system.