ETE AJAPI Wastewater Treatment Plant, Rio Claro, São Paulo, Brazil

ETE AJAPI is a municipal wastewater treatment facility located in Rio Claro, within the state of São Paulo, Brazil. The plant serves a population of 4,265 residents, classifying it as a small-scale agglomeration under Brazilian wastewater management frameworks. It is situated inland, approximately 135 km from the coast, in the southeastern region of the country. The plant provides secondary treatment, which is the standard level required by Brazilian regulations (CONAMA Resolutions) for inland discharges to protect water quality. The facility processes an average daily flow of 864.00 cubic meters. As a secondary treatment plant, it removes organic matter and suspended solids, reducing the pollutant load before discharge. The treated effluent from ETE AJAPI is released into local streams that drain into the Corumbataí River basin, a tributary of the Piracicaba River. This river system flows into the Tietê River, which ultimately reaches the Paraná River basin. The plant plays a key role in safeguarding water quality in the Corumbataí watershed, which supports agricultural activities and provides drinking water for downstream communities.

The plant discharges into the Corumbataí River basin, part of the larger Piracicaba River watershed, which flows into the Tietê River and eventually the Paraná River basin. This region is ecologically significant, supporting diverse aquatic life and providing water for agriculture and urban use. The secondary treatment helps reduce nutrient and organic pollution, protecting downstream ecosystems from eutrophication and oxygen depletion.