ETE Redenção da Serra - Secondary Wastewater Treatment Plant in Redenção da Serra, São Paulo

ETE Redenção da Serra is a municipal wastewater treatment plant located in Redenção da Serra, a small town in the state of São Paulo, Brazil. The plant serves a population of 1,268 residents, reflecting its role in a small agglomeration. It is situated in the Paraíba do Sul river basin, an ecologically important region in southeastern Brazil. The plant provides secondary treatment, which is the standard level required under Brazilian regulations (CONAMA resolutions) for communities of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local watercourses that ultimately drain into the Paraíba do Sul River, a major river flowing through São Paulo and Rio de Janeiro states. This river supports diverse aquatic life and provides water for millions of people downstream. The plant's operation helps protect water quality in the region, particularly in the context of the Atlantic Forest biome, which is known for its high biodiversity and sensitive ecosystems.

The plant discharges into tributaries of the Paraíba do Sul River, which flows through the densely populated Vale do Paraíba region before reaching the Atlantic Ocean near Campos dos Goytacazes. The river supports important ecosystems, including remnants of the Atlantic Forest, and is a critical water source for agriculture, industry, and drinking water. The region's steep terrain and seasonal rainfall patterns can influence runoff and water quality, making effective wastewater treatment essential for maintaining ecological balance.