ETE Cajazeiras XI Wastewater Treatment Plant, Salvador, Bahia

ETE Cajazeiras XI is a wastewater treatment plant located in the Cajazeiras neighborhood of Salvador, Bahia, Brazil. It serves a population of approximately 7,311 residents, making it a small-scale facility within the metropolitan region of Salvador. The plant provides secondary treatment, which is the standard biological treatment process required for municipal wastewater in Brazil under national regulations. The plant operates under Brazil's environmental framework, which mandates secondary treatment for urban agglomerations. With a discharge volume of 790.22 m³/day, the facility treats wastewater before releasing it into the local environment. As a coastal plant within 10 km of the Atlantic Ocean, it plays a critical role in protecting marine water quality. The treated effluent from ETE Cajazeiras XI ultimately drains into the Atlantic Ocean via local watercourses in the Salvador region. The coastal waters near Salvador support diverse marine life, including coral reefs and mangroves, making proper wastewater treatment essential for preserving these ecosystems and maintaining public health along the shoreline.

The plant discharges into the Atlantic Ocean via local drainage systems in the Salvador coastal area. The receiving waters are part of the Baía de Todos os Santos watershed, a large tropical bay that supports mangroves, seagrass beds, and coral reefs. Proper secondary treatment helps reduce nutrient and pathogen loads, protecting these sensitive coastal habitats and the fisheries that depend on them.