ETE VILA AZUL Wastewater Treatment Plant, Araguaína, Tocantins, Brazil

ETE VILA AZUL is a municipal wastewater treatment plant located in the Vila Azul neighborhood of Araguaína, in the state of Tocantins, northern Brazil. The plant serves a population of approximately 6,287 residents, placing it in the small-agglomeration category under Brazilian regulatory frameworks. The plant provides secondary treatment, which is the standard level required by Brazilian environmental legislation (CONAMA resolutions) for most inland communities of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids before discharge. The plant processes an average of 501.12 cubic meters of wastewater per day. The treated effluent is discharged into local water bodies that ultimately drain into the Tocantins River basin, a major Amazon tributary. The plant plays a key role in protecting downstream water quality and aquatic ecosystems in the Araguaína region, supporting both environmental health and public sanitation.

The plant discharges into the Tocantins River basin, which flows northward into the Amazon River delta and the Atlantic Ocean. This watershed supports diverse aquatic life, including fish species important for local fisheries. The secondary treatment provided by ETE VILA AZUL helps reduce nutrient and organic pollution loads, mitigating eutrophication risks in downstream rivers and reservoirs.