ETE Tanquinho Wastewater Treatment Plant - Piracicaba, São Paulo, Brazil

ETE Tanquinho is a municipal wastewater treatment plant located in the Guamium district of Piracicaba, in the state of São Paulo, Brazil. It serves a small population of 541 residents, reflecting its role in a localized community within the broader Piracicaba metropolitan region. The plant provides secondary treatment, which is the standard biological treatment level required for most urban wastewater in Brazil under federal CONAMA regulations. Secondary treatment typically involves biological degradation of organic matter, reducing biochemical oxygen demand and suspended solids before discharge. The treated effluent is released into the local watershed, which ultimately drains into the Piracicaba River, a key tributary of the Tietê River basin. This river system flows through São Paulo state and eventually reaches the Paraná River basin, supporting diverse aquatic life and agricultural water use downstream.

The plant discharges into the Piracicaba River basin, part of the larger Tietê River watershed that drains into the Paraná River and eventually the Río de la Plata estuary. This region supports diverse freshwater ecosystems and is important for regional water supply and agriculture. The secondary treatment helps protect downstream water quality in this ecologically sensitive basin.