ETE Santana I Wastewater Treatment Plant, Piracicaba, São Paulo

ETE Santana I is a wastewater treatment plant located in the Santa Terezinha de Piracicaba district of Piracicaba, in the state of São Paulo, Brazil. It serves a small population of 157 people, reflecting its role in a localized community within the broader Piracicaba metropolitan region. The plant provides secondary treatment, which is the standard biological treatment process that removes organic matter and suspended solids. With a daily discharge volume of 35.00, the plant operates at a scale consistent with its small service population. Brazilian wastewater treatment regulations, such as CONAMA resolutions, set effluent quality standards that secondary treatment plants must meet to protect receiving water bodies. The treated effluent is discharged into local waterways that ultimately drain into the Piracicaba River basin, a tributary of the Tietê River. The Tietê River flows through São Paulo state and empties into the Paraná River basin, which is part of the larger La Plata Basin. This watershed supports diverse aquatic life and provides water for agriculture and urban use downstream.

The plant's discharge enters the Piracicaba River basin, which flows into the Tietê River, a major waterway in São Paulo state. The Tietê River eventually joins the Paraná River, part of the La Plata Basin, one of South America's largest watersheds. This river system supports diverse aquatic ecosystems and provides water for millions of people, making proper wastewater treatment critical to preventing nutrient pollution and maintaining water quality.