ETE Laranjeiras Castilho - Wastewater Treatment Plant in Castilho, São Paulo, Brazil

ETE Laranjeiras Castilho is a municipal wastewater treatment plant located in Castilho, within the state of São Paulo, Brazil. The facility serves a population of approximately 3,460 residents, classifying it as a small-scale treatment operation in the region. The plant employs secondary treatment processes, which involve biological degradation of organic matter. The plant's discharge volume of 432.00 cubic meters per day indicates its operational scale. Brazilian wastewater treatment plants are regulated under federal environmental standards, including CONAMA resolutions, which mandate appropriate treatment levels based on receiving water body sensitivity and population served. The treated effluent is discharged into local watercourses that ultimately drain into the Paraná River basin, one of South America's major river systems. This basin supports diverse aquatic ecosystems and provides water for agriculture, industry, and communities downstream. Proper treatment helps protect water quality in this ecologically significant watershed.

The plant's discharge enters local streams that flow into the Paraná River basin, a vast system draining into the Río de la Plata estuary. This watershed supports diverse aquatic life, including migratory fish species, and is important for regional water supply. The secondary treatment reduces organic pollutants, helping to maintain ecological balance in downstream environments.