ETE CONTENDA Wastewater Treatment Plant, Araucária, Paraná, Brazil

ETE CONTENDA is a municipal wastewater treatment facility located in Araucária, within the metropolitan region of Curitiba, Paraná, Brazil. The plant serves a population of around 6,444 residents, classifying it as a small-scale treatment facility under Brazilian regulatory frameworks. The plant provides secondary treatment, a standard level required by Brazilian environmental regulations (CONAMA resolutions) for inland discharges. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring compliance with national effluent quality standards before discharge. Treated wastewater from ETE CONTENDA is discharged into local water bodies that drain into the Iguaçu River, a major watercourse in southern Brazil. The Iguaçu River flows westward to the Iguaçu Falls and eventually joins the Paraná River, supporting diverse aquatic ecosystems and providing water for downstream communities.

The plant discharges into the Iguaçu River basin, which flows through the Atlantic Forest biome, a biodiversity hotspot. The Iguaçu River is ecologically significant, supporting species such as the neotropical otter and various migratory fish. Downstream, the river feeds the Iguaçu Falls and ultimately the Paraná River, which drains into the Río de la Plata estuary. Protecting water quality in this basin is critical for maintaining regional aquatic habitats and human water uses.