ETE Rio de Contas - Secondary Wastewater Treatment Plant in Rio de Contas, Bahia, Brazil

ETE Rio de Contas is a municipal wastewater treatment plant located in the Vermelhão area of Rio de Contas, a town in the state of Bahia, Brazil. The plant serves a population of approximately 2,765 residents, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard biological process required under Brazilian regulations (CONAMA resolutions) for urban wastewater. This level of treatment removes organic matter and suspended solids, ensuring the effluent meets basic quality standards before discharge. The treated effluent is released into the local water system, which ultimately drains into the Rio de Contas basin. This river flows through the semi-arid interior of Bahia before reaching the Atlantic Ocean. The plant plays a key role in protecting downstream water quality, particularly for communities and ecosystems that depend on the river for water supply and agriculture.

The plant discharges into the Rio de Contas watershed, a river system that flows through the Caatinga biome, a unique semi-arid ecosystem in northeastern Brazil. The river eventually reaches the Atlantic Ocean near the city of Itacaré. The Caatinga is characterized by seasonal droughts and high biodiversity, making water quality management critical for sustaining aquatic life and local livelihoods. The plant's secondary treatment helps reduce organic pollution and nutrient loading, which is important for preventing eutrophication in downstream water bodies.