ETE CASAS DO METRo - Secondary Wastewater Treatment Plant in Salvador, Bahia

ETE CASAS DO METRo is a municipal wastewater treatment plant located in the Jardim Santo Inácio neighborhood of Salvador, Bahia, Brazil. The plant serves a small population of 501 people and operates with secondary treatment, which is the standard biological process for removing organic matter and suspended solids. As a facility in Brazil's Northeast region, it contributes to the sanitation infrastructure of the Salvador metropolitan area. The plant treats an average of 54.17 m³ of wastewater per day. Secondary treatment typically involves biological aeration and sedimentation. Under Brazilian regulations (CONAMA resolutions and the National Sanitation Plan), plants of this scale are expected to meet effluent standards for BOD, COD, and total suspended solids before discharge. The treated effluent is discharged into the local drainage system, which ultimately flows into the Atlantic Ocean via the Bay of All Saints (Baía de Todos os Santos). This bay is a large, ecologically important estuary that supports diverse marine life, including mangroves and fish nurseries. The plant's coastal proximity underscores the importance of effective treatment to protect coastal water quality.

The plant's discharge enters the drainage network of Salvador, which flows into the Bay of All Saints (Baía de Todos os Santos), a large tropical estuary on Brazil's northeastern coast. This bay is a critical habitat for mangroves, seagrasses, and marine species, and supports local fisheries. The plant's coastal location means that treated effluent must meet stringent standards to avoid nutrient enrichment and pathogen contamination in the sensitive marine environment.