ETE ISAAC POLITI Wastewater Treatment Plant - Agulhas Negras, Rio de Janeiro

ETE ISAAC POLITI is a wastewater treatment facility located in the Agulhas Negras district of Resende, within the state of Rio de Janeiro, Brazil. The plant serves a small community of 2,360 residents, providing secondary-level treatment to municipal wastewater. It is situated inland, away from coastal areas, and operates as part of the region's sanitation infrastructure. The plant employs secondary treatment processes, which typically involve biological degradation of organic matter followed by sedimentation. With a discharge volume of 372.00 cubic meters, the facility meets the basic treatment standards expected for small agglomerations under Brazilian environmental regulations. Brazil's National Environment Council (CONAMA) sets discharge standards that apply to all treatment plants, requiring compliance with parameters such as BOD, COD, and suspended solids. The treated effluent is discharged into a local water body that ultimately drains into the Paraíba do Sul River basin, a major river system in southeastern Brazil. The Paraíba do Sul flows through the states of São Paulo, Rio de Janeiro, and Minas Gerais before reaching the Atlantic Ocean near Campos dos Goytacazes. The river supports diverse aquatic life and provides water for agriculture, industry, and drinking water for millions of people downstream.

The plant discharges into a tributary of the Paraíba do Sul River, which flows through the densely populated and industrialized Paraíba Valley before emptying into the Atlantic Ocean. The river is ecologically important, supporting fish species and providing habitat for migratory birds. Downstream, the river's estuary and coastal zone are sensitive to nutrient inputs, making effective wastewater treatment critical for maintaining water quality and preventing eutrophication.