ETE Coronel Macedo Wastewater Treatment Plant, Coronel Macedo, São Paulo

ETE Coronel Macedo is a wastewater treatment plant located in Coronel Macedo, a municipality in the state of São Paulo, Brazil. The plant provides secondary treatment for a population of about 3,394 residents, making it a small-scale facility serving the local community. As a secondary treatment plant, ETE Coronel Macedo employs biological processes to remove organic matter and suspended solids from wastewater. The plant discharges an average of 372.96 cubic meters of treated effluent daily. In Brazil, wastewater treatment plants are regulated under federal environmental laws, including CONAMA resolutions, and state-level agencies such as CETESB in São Paulo oversee permitting and compliance. The treated effluent from the plant is discharged into a local watercourse, which eventually drains into the Paranapanema River basin, a major tributary of the Paraná River. The Paraná River system flows into the Río de la Plata estuary, supporting diverse aquatic ecosystems and providing water for agriculture and urban areas downstream.

The plant's discharge enters a small stream within the Paranapanema River basin, which flows into the Paraná River and ultimately reaches the Río de la Plata estuary. This watershed supports important aquatic habitats and is used for irrigation and drinking water supply. The region's subtropical climate and agricultural land use mean that nutrient loading from wastewater can contribute to eutrophication in downstream water bodies if not properly managed.