ETE RIO DAS PEDRAS Wastewater Treatment Plant, Marilândia do Sul, Paraná

ETE RIO DAS PEDRAS is a wastewater treatment plant located in Marilândia do Sul, in the state of Paraná, Brazil. It serves a small population of 884 residents, reflecting its role as a local facility for the community. The plant is situated in the southern region of Brazil, an area characterized by its agricultural landscape and subtropical climate. The plant operates with secondary treatment, which is appropriate for its scale and aligns with Brazilian regulatory standards for smaller agglomerations. Under Brazil's National Environmental Council (CONAMA) resolutions, secondary treatment is typically required to reduce organic load and suspended solids before discharge. The plant processes an average daily flow of 86.40 m³, indicating consistent operation within its designed capacity. The treated effluent is discharged into a local water body, which eventually drains into the Tibagi River basin, a major tributary of the Paranapanema River. This river system flows into the Paraná River and ultimately reaches the Río de la Plata estuary. The plant's operation helps protect downstream aquatic ecosystems, including fish habitats and water quality for agricultural use in the region.

The plant discharges into a local stream that feeds into the Tibagi River, a key watercourse in Paraná. The Tibagi River flows into the Paranapanema River, which joins the Paraná River and drains into the Río de la Plata estuary. This watershed supports diverse aquatic life and is important for regional agriculture and water supply. The plant's secondary treatment reduces organic pollutants, helping to maintain water quality in this ecologically sensitive basin.