ETE Ribeirao Sarandi Wastewater Treatment Plant, Marialva, Paraná, Brazil

ETE Ribeirao Sarandi is a municipal wastewater treatment plant located in Marialva, within the state of Paraná, Brazil. The facility serves a population of around 9,131 people, classifying it as a small to medium agglomeration under Brazilian wastewater management frameworks. The plant provides secondary treatment, which is the standard biological treatment stage required for most urban wastewater in Brazil. The plant's discharge volume of 845.90 indicates ongoing operational activity. Brazilian regulations, aligned with national environmental standards, mandate secondary treatment for communities of this size to reduce organic pollutants and protect water quality. 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 plays a key role in safeguarding downstream aquatic ecosystems, including rivers and streams that support diverse freshwater species and agricultural activities in the region.

The plant discharges into the Paraná River basin, a major South American watershed that drains into the Río de la Plata estuary. This basin supports diverse aquatic life and is important for regional water supply and agriculture. The secondary treatment helps reduce nutrient and organic loads, protecting downstream water quality and ecological balance.