ETE Barreto Wastewater Treatment Plant, Niterói, Rio de Janeiro, Brazil

ETE Barreto is a wastewater treatment plant located in the Barreto neighborhood of Niterói, in the state of Rio de Janeiro, Brazil. The plant serves a population of around 14,588 residents, contributing to the sanitation infrastructure of the Região Metropolitana do Rio de Janeiro. As a plant in Brazil, ETE Barreto is subject to the country's environmental regulations, including CONAMA resolutions and state-level water quality standards. For a plant serving this population size, secondary treatment is typically required to meet effluent standards before discharge. The plant's treated effluent is discharged into the local watershed, which ultimately drains into Guanabara Bay, a large coastal bay in southeastern Brazil. Guanabara Bay supports diverse aquatic life and is an important ecological and economic resource for the region.

The treated wastewater from ETE Barreto flows into the local drainage network and eventually reaches Guanabara Bay, a major estuarine system in Rio de Janeiro state. Guanabara Bay supports mangrove forests, fish populations, and migratory birds, but faces environmental pressures from urbanization and industrial activities. Proper treatment at plants like ETE Barreto is crucial for maintaining water quality in the bay.