ETE PINHAO TANGUA - Secondary Wastewater Treatment Plant in Tanguá, Rio de Janeiro, Brazil

ETE PINHAO TANGUA is a wastewater treatment plant located in Tanguá, within the Rio de Janeiro metropolitan region of Brazil. The facility serves a population of approximately 1,250 residents, classifying it as a small-scale municipal treatment operation. Its location in the Região Sudeste places it within a densely populated and economically active area of the country. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids from wastewater. In Brazil, such facilities are regulated under the National Environmental Council (CONAMA) resolutions and state-level environmental agencies, which set discharge standards for water quality. For a plant of this size, secondary treatment meets typical requirements for inland discharge, though more stringent tertiary treatment may be needed for sensitive receiving waters. The treated effluent is discharged into local water bodies that ultimately drain into the Atlantic Ocean via the Guanabara Bay watershed. This region supports diverse aquatic ecosystems and is important for local fisheries and recreation. The plant's operation helps reduce nutrient and pollutant loads, contributing to the protection of downstream water quality and the health of the coastal environment.

The plant discharges into the Guanabara Bay basin, which flows into the Atlantic Ocean. This watershed is ecologically sensitive, supporting mangroves, estuaries, and marine habitats that are vital for fish spawning and migratory birds. Nutrient pollution from untreated or poorly treated wastewater can lead to eutrophication and algal blooms, so the plant's secondary treatment plays a key role in maintaining water quality in this coastal ecosystem.