ETE ARAPEI Wastewater Treatment Plant - Arapeí, São Paulo, Brazil

ETE ARAPEI is a municipal wastewater treatment facility located in Arapeí, within the state of São Paulo, Brazil. The plant serves a small community of approximately 1,471 residents, reflecting its role in managing domestic wastewater for this inland town in the Vale do Paraíba region. The plant provides secondary treatment, which is the standard biological treatment process that removes organic matter and suspended solids. The plant's discharge volume of 133.02 cubic meters per day aligns with the scale of the population served. In Brazil, wastewater treatment plants are regulated under federal and state environmental laws, with permits issued by agencies such as CETESB in São Paulo. The treated effluent is discharged into local water bodies that ultimately drain into the Paraíba do Sul River basin, a major river system in southeastern Brazil. This river flows through the Paraíba Valley and empties into the Atlantic Ocean near Campos dos Goytacazes. The plant's operation helps protect downstream water quality and aquatic ecosystems in this ecologically important region.

The plant discharges into the Paraíba do Sul River basin, which flows through the Vale do Paraíba region and drains into the Atlantic Ocean. This watershed supports diverse aquatic life and provides water for agriculture, industry, and drinking water for millions of people downstream. The secondary treatment process reduces organic pollutants, helping to maintain the ecological health of the river system.