ETE Sertanópolis Wastewater Treatment Plant, Sertanópolis, Paraná, Brazil

ETE Sertanópolis is a municipal wastewater treatment plant located in Sertanópolis, within the state of Paraná in southern Brazil. The facility serves a population of approximately 8,551 residents, classifying it as a small to medium-sized agglomeration under Brazilian sanitation standards. The plant provides secondary treatment, which is the standard biological process required for urban wastewater in Brazil under CONAMA Resolution 430/2011 and the National Basic Sanitation Plan (PLANSAB). Secondary treatment typically involves biological degradation of organic matter, reducing biochemical oxygen demand (BOD) and suspended solids before discharge. The treated effluent is discharged into local water bodies within the Paraná River basin, which ultimately flows into the Río de la Plata estuary. The plant's operation helps protect downstream aquatic ecosystems and supports water quality in the region's agricultural and urban areas.

The plant discharges into the Paraná River basin, a major South American watershed that drains into the Río de la Plata and the Atlantic Ocean. This basin supports diverse aquatic life, including migratory fish species, and provides water for irrigation and drinking. The secondary treatment reduces organic pollutants, helping to maintain ecological balance in the receiving waters.