ETE BATISTA BOTELHO - Secondary Wastewater Treatment Plant in Óleo, São Paulo

ETE BATISTA BOTELHO is a wastewater treatment plant located in Óleo, a municipality in the state of São Paulo, Brazil. The plant serves a small population of 255 residents, reflecting its role in a rural or small-town setting. It operates under Brazil's national environmental regulations, which mandate secondary treatment for communities of this scale to protect water quality. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. Secondary treatment is the minimum requirement under Brazilian Resolution CONAMA 430/2011 for wastewater discharge into freshwater bodies. The plant's discharge volume is 38.70 m³/day, indicating a modest operational scale. The treated effluent is discharged into local watercourses that drain into the Paranapanema River basin, a major tributary of the Paraná River system. This basin supports diverse aquatic ecosystems and is important for regional water supply and agriculture. The plant's operation helps protect downstream water quality in this ecologically significant watershed.

The plant discharges into streams that flow into the Paranapanema River, which eventually joins the Paraná River and drains into the Río de la Plata estuary. The Paranapanema basin supports diverse aquatic life, including migratory fish species, and is a critical water resource for agriculture and communities in São Paulo state. Proper wastewater treatment is essential to prevent nutrient pollution and maintain ecological balance in this sensitive freshwater system.