ETE PERNADA Wastewater Treatment Plant, Monte Santo do Tocantins, Tocantins, Brazil

ETE PERNADA is a wastewater treatment plant located in Monte Santo do Tocantins, within the Tocantins state of Brazil. It serves a population of approximately 3,199 people, classifying it as a small-scale municipal facility in the northern region of the country. The plant operates under Brazil's national environmental regulations, which mandate secondary treatment for urban wastewater to protect water quality. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a discharge volume of 349.03 m³/day, it manages the domestic wastewater from the local community. Secondary treatment aligns with typical requirements for small agglomerations in Brazil. The treated effluent is discharged into the local watershed, which ultimately drains into the Tocantins River basin. This river system is ecologically significant, supporting diverse aquatic life and providing water for communities downstream. The plant's operation helps reduce pollution loads in the region's waterways, contributing to the preservation of freshwater ecosystems in the Amazonian transition zone.

The plant discharges into the Tocantins River basin, a major tributary of the Amazon River system. The watershed supports a rich biodiversity, including fish species and riparian vegetation. Downstream, the water flows through the Tocantins-Araguaia basin, which is critical for local fisheries and water supply. The region's tropical climate and seasonal rainfall patterns influence the river's flow and dilution capacity, making consistent treatment important for maintaining ecological balance.