ETE Rodelas Wastewater Treatment Plant, Rodelas, Bahia, Brazil

ETE Rodelas is a municipal wastewater treatment plant located in Rodelas, a city in the state of Bahia, Brazil. The plant serves a population of 7,261 people, placing it in the small agglomeration category under Brazilian regulatory frameworks. It operates secondary treatment, which is the minimum standard required for most urban wastewater in Brazil under CONAMA Resolution 430/2011. The plant discharges 464.70 m³/day of treated wastewater. The plant's secondary treatment level aligns with typical requirements for communities of this size in Brazil. The regulatory framework for wastewater treatment in Brazil is established by the National Environment Council (CONAMA) and state environmental agencies, which set discharge standards for parameters such as BOD, COD, and nutrients. The treated effluent from ETE Rodelas ultimately reaches the São Francisco River basin, one of Brazil's most important water systems. The São Francisco River flows through the semi-arid Northeast region and supports diverse aquatic life, including endemic fish species. The river is a critical water source for agriculture, drinking water, and hydropower, making proper wastewater treatment essential for protecting downstream water quality and ecosystem health.

ETE Rodelas discharges into the São Francisco River basin, which drains into the Atlantic Ocean. The São Francisco River is a major watercourse in northeastern Brazil, supporting a variety of aquatic species including migratory fish and endemic catfish. The river's flow is regulated by dams, and its waters are used for irrigation and human consumption. Proper treatment at ETE Rodelas helps reduce nutrient and pathogen loads, protecting downstream aquatic habitats and water quality for communities along the river.