ETE ABC Wastewater Treatment Plant, São Paulo, Brazil

ETE ABC is a municipal wastewater treatment plant located in the Sacomã district of São Paulo, Brazil. It serves a population of approximately 149,263 residents, making it a medium-to-large agglomeration within the metropolitan region. The plant is situated in the southeastern region of Brazil, an area characterized by high urbanization and industrial activity. As a plant of this scale in Brazil, ETE ABC is subject to the National Environmental Council (CONAMA) resolutions, particularly CONAMA 430/2011, which sets effluent discharge standards. Plants serving populations over 100,000 typically employ secondary or advanced treatment to meet regulatory requirements. The designed capacity is reported as 1.00, though the unit is unspecified, indicating the plant's infrastructure is sized for significant throughput. The plant's treated effluent is discharged into the local drainage system, which ultimately flows into the Tietê River basin. The Tietê River is a major waterway in São Paulo state, flowing through the metropolitan region and eventually into the Paraná River system. This river supports diverse aquatic life and provides water for downstream communities, agriculture, and industry. Proper treatment at ETE ABC is critical to protecting water quality in this heavily urbanized watershed.

ETE ABC discharges into the Tietê River basin, which flows through the São Paulo metropolitan region and eventually joins the Paraná River, one of South America's major river systems. The Tietê River is ecologically significant, supporting fish populations and providing water for millions of people. However, urbanization and industrial activity have stressed water quality, making effective wastewater treatment essential to reduce nutrient loads and pollutants that can cause eutrophication and harm aquatic life downstream.