ETE Santo Antonio 2 Wastewater Treatment Plant, Cuiabá, Mato Grosso, Brazil

ETE Santo Antonio 2 is a wastewater treatment plant located in the Parque Geórgia neighborhood of Cuiabá, the capital of Mato Grosso state in Brazil. The plant serves a small population of 372 residents, reflecting its role in a localized area of the city. The plant provides secondary treatment, which is the standard biological treatment required under Brazilian regulations (CONAMA resolutions) for municipal wastewater. This level of treatment significantly reduces organic matter and suspended solids before discharge. The treated effluent is discharged into the Cuiabá River basin, which flows through the Pantanal region, one of the world's largest tropical wetlands. The plant's operation helps protect downstream water quality in this ecologically sensitive area, supporting aquatic life and local communities that depend on the river.

The plant discharges into the Cuiabá River, a tributary of the Paraguay River, which flows through the Pantanal, a vast floodplain ecosystem. The Pantanal supports diverse aquatic species, including fish, caimans, and migratory birds. Proper treatment is essential to prevent nutrient pollution and maintain the ecological balance of this globally important wetland.