ETE Monjolinho Wastewater Treatment Plant, São Carlos, São Paulo, Brazil

ETE Monjolinho is a municipal wastewater treatment plant located in São Carlos, São Paulo, Brazil. The plant serves an estimated population of 193,886 people, making it a large agglomeration under Brazilian wastewater management standards. It is situated in the southeastern region of Brazil, an area characterized by a subtropical climate and significant urban and industrial development. As a large-scale treatment facility, ETE Monjolinho is expected to comply with Brazilian national regulations, including CONAMA Resolution 430/2011 and state-level standards from CETESB, which mandate appropriate treatment levels to protect water quality. Plants of this scale typically employ secondary or advanced treatment to meet effluent standards for discharge into local water bodies. The plant discharges treated effluent into the Monjolinho River, a tributary of the Jacaré-Guaçu River, which flows into the Tietê River basin. The Tietê River ultimately drains into the Paraná River system, one of South America's major river basins. The receiving waters support diverse aquatic life and are important for regional water supply and agriculture, making effective treatment essential for environmental protection.

The plant discharges into the Monjolinho River, which flows into the Jacaré-Guaçu River, a tributary of the Tietê River. The Tietê River basin is a major waterway in São Paulo state, ultimately draining into the Paraná River system. The downstream environment includes reservoirs and rivers that support aquatic biodiversity and are used for water supply, irrigation, and recreation. Effective wastewater treatment is critical to prevent nutrient pollution and protect these water resources.