ETE SUL LONDRINA Wastewater Treatment Plant, Londrina, Paraná, Brazil

ETE SUL LONDRINA is a major wastewater treatment facility located in the Jardim Piza neighborhood of Londrina, in the state of Paraná, Brazil. Serving an estimated population of 172,968, it is classified as a large agglomeration under Brazilian sanitation standards, which require robust treatment infrastructure to protect public health and the environment. Brazil's wastewater treatment framework is governed by the National Environmental Council (CONAMA) and the National Water Agency (ANA), with state-level environmental agencies overseeing permits and compliance. For plants of this scale, secondary treatment is typically mandated, with nutrient removal increasingly required in sensitive watersheds. The plant's operational details, including specific treatment processes and discharge volume, are part of the municipal sanitation plan managed by the local water utility. The treated effluent from ETE SUL LONDRINA is discharged into local water bodies that ultimately drain into the Paraná River basin, one of South America's most significant river systems. The Paraná River flows southward through Brazil, Paraguay, and Argentina before emptying into the Río de la Plata estuary. This downstream environment supports diverse aquatic ecosystems and provides water for agriculture, industry, and drinking water for millions of people.

The plant's discharge contributes to the Paraná River basin, which drains into the Río de la Plata estuary. This watershed supports ecologically sensitive wetlands and floodplains that provide critical habitat for migratory birds and aquatic species. The region's subtropical climate and agricultural land use make nutrient management a key concern for downstream water quality.