ETE Salto Osório - Secondary Wastewater Treatment Plant in Quedas do Iguaçu, Paraná

ETE Salto Osório is a wastewater treatment plant located in Quedas do Iguaçu, in the state of Paraná, Brazil. It serves a small population of 771 residents, reflecting its role in a rural or small urban community. The plant is part of the regional infrastructure managed under Brazilian environmental regulations. The plant provides secondary treatment, which is the standard level required by Brazilian legislation (CONAMA resolutions) for most municipal wastewater. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant discharges an average of 101.09 m³/day of treated effluent. The treated wastewater is released into local water bodies that drain into the Iguaçu River basin, a major watershed in southern Brazil. The Iguaçu River flows westward and eventually joins the Paraná River, forming the border between Brazil and Argentina. The downstream environment supports diverse aquatic life and is ecologically sensitive, particularly near the Iguaçu National Park area.

The plant's effluent enters the local drainage network, which feeds into the Iguaçu River basin. The Iguaçu River is a major tributary of the Paraná River, one of South America's largest river systems. The downstream environment includes ecologically important areas that support diverse fish species and riparian habitats. Proper treatment is essential to protect water quality in this sensitive watershed.