ETE Engenheiro Gil Portugal Wastewater Treatment Plant, Volta Redonda, Rio de Janeiro

ETE Engenheiro Gil Portugal is a municipal wastewater treatment plant located in Volta Redonda, within the state of Rio de Janeiro, Brazil. The facility serves an estimated population of 67,834, placing it in the medium agglomeration category for Brazilian wastewater infrastructure. Brazil's wastewater treatment standards are governed by CONAMA Resolution 430/2011 and the National Water Resources Policy (Law 9. 433/1997). For plants of this scale, secondary treatment is typically required to reduce organic load and suspended solids before discharge. The plant's designed capacity is 1. 00 cubic meter per second, indicating a substantial infrastructure investment. The treated effluent is discharged into the Paraíba do Sul River basin, which flows through the Paraíba do Sul Valley and ultimately reaches the Atlantic Ocean near Campos dos Goytacazes. The river is a critical water source for the region, supporting agriculture, industry, and drinking water supplies for downstream communities.

The plant discharges into the Paraíba do Sul River, a major watercourse in southeastern Brazil that drains into the Atlantic Ocean. The river basin supports diverse aquatic ecosystems and provides water for millions of people. Downstream, the river flows through the Paraíba do Sul Valley, an area of ecological importance with riparian forests and wetlands that help filter pollutants and maintain water quality.