ETE ARARAS SANTA MARIANA - Secondary Wastewater Treatment in Santa Mariana, Paraná

ETE ARARAS SANTA MARIANA is a wastewater treatment plant located in Santa Mariana, within the state of Paraná, Brazil. The facility serves a population of approximately 4,426 people, classifying it as a small-scale municipal treatment operation in the southern region of the country. The plant provides secondary treatment, which is the standard biological treatment stage that removes organic matter and suspended solids. Under Brazilian regulations (CONAMA resolutions and the National Water Resources Policy), secondary treatment is typically required for inland discharges to protect water quality. The treated effluent is discharged into local water bodies that ultimately drain into the Paraná River basin, one of South America's major river systems. This basin supports diverse aquatic ecosystems and is important for regional water supply and agriculture. The plant's operation helps reduce nutrient and organic pollution loads, contributing to the ecological health of downstream waters.

The plant discharges into the Paraná River basin, which flows through southern Brazil and into the Río de la Plata estuary. This watershed supports diverse aquatic life, including migratory fish species, and is ecologically sensitive due to agricultural runoff and urban pressures. The secondary treatment provided helps mitigate nutrient enrichment and organic pollution in the receiving waters.