ETE I 3 BRESSAN - Secondary Wastewater Treatment Plant in Toledo, Paraná, Brazil

ETE I 3 BRESSAN is a municipal wastewater treatment plant located in the Jardim Bressan neighborhood of Toledo, in the state of Paraná, Brazil. The plant serves a population of approximately 3,127 residents, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard biological process required by Brazilian regulations (CONAMA resolutions) for most urban wastewater. Secondary treatment typically involves biological degradation of organic matter followed by sedimentation. The plant treats an average daily flow of 374.11 m³, reflecting its capacity to handle the local community's wastewater. The treated effluent is discharged into local water bodies that eventually drain into the Paraná River basin, one of South America's major river systems. The Paraná River flows southward through Brazil, Paraguay, and Argentina before emptying into the Río de la Plata estuary. The plant's operation helps protect downstream water quality and aquatic ecosystems in this ecologically significant watershed.

The plant discharges into the Paraná River basin, which flows through the Atlantic Forest and Cerrado biomes before reaching the Río de la Plata estuary. This watershed supports diverse aquatic life, including migratory fish species. The secondary treatment reduces organic pollution, helping to maintain water quality in downstream rivers and reservoirs that supply drinking water and support agriculture.