ETE SAO SEBASTIAO 1 Wastewater Treatment Plant, Fraiburgo, Santa Catarina

ETE SAO SEBASTIAO 1 is a wastewater treatment plant located in Fraiburgo, within the state of Santa Catarina, Brazil. It serves a population of approximately 1,166 people, making it a small-scale facility in the region's sanitation infrastructure. The plant is situated in the southern part of Brazil, an area characterized by a subtropical climate and mixed agricultural and urban land use. The plant provides secondary treatment, which is a standard biological process that removes organic matter and suspended solids. Under Brazilian regulations, such as CONAMA Resolution 430/2011, secondary treatment is typically required for inland discharges to protect water quality. The plant's discharge volume is 216.00 m³/day, indicating a modest operational scale consistent with the small population served. The treated effluent is discharged into a local water body, contributing to the protection of downstream ecosystems. The plant plays a role in safeguarding the regional watershed, which ultimately drains into the Atlantic Ocean via the Uruguay River basin. By reducing pollutant loads, the facility helps maintain water quality for aquatic life and downstream communities.

The plant discharges into a local watercourse that is part of the Uruguay River basin, which flows through southern Brazil and Uruguay before reaching the Atlantic Ocean. The region supports diverse aquatic habitats and is important for migratory fish species. Effective treatment helps prevent eutrophication and protects downstream water quality in this ecologically sensitive watershed.