ETE Sao Silvestre Jacarei - Secondary Wastewater Treatment in Jacarei, Sao Paulo

ETE Sao Silvestre Jacarei is a municipal wastewater treatment plant located in the Vila Garcia neighborhood of Jacarei, Sao Paulo, Brazil. The plant serves a population of 7,393 residents, classifying it as a small agglomeration under Brazilian wastewater management frameworks. It operates within the Regiao Metropolitana do Vale do Paraiba e Litoral Norte, an industrialized and densely populated region. The plant provides secondary treatment, which is the standard biological process required for most urban wastewater in Brazil under federal CONAMA resolutions. Secondary treatment typically involves biological oxidation and sedimentation, reducing organic matter and suspended solids before discharge. The plant treats an average daily flow of 647.00 cubic meters, reflecting its capacity to handle the local community's wastewater load. The treated effluent is discharged into local watercourses that ultimately drain into the Paraiba do Sul River, one of Brazil's most important rivers, supplying water to millions downstream. The Paraiba do Sul basin supports diverse aquatic ecosystems and is a critical water source for agriculture, industry, and drinking water. By providing secondary treatment, the plant helps protect this vital watershed from nutrient pollution and pathogens, contributing to regional environmental health.

The plant discharges into tributaries of the Paraiba do Sul River, which flows through the Vale do Paraiba region before reaching the Atlantic Ocean near Campos dos Goytacazes. The river basin is ecologically significant, supporting diverse fish species and riparian forests. Downstream, the river supplies water to major cities and agricultural areas, making pollution control essential. The plant's secondary treatment reduces organic load and suspended solids, helping maintain water quality in this sensitive watershed.