ETE Esmeralda Wastewater Treatment Plant, Porto Alegre, Rio Grande do Sul

ETE Esmeralda is a wastewater treatment plant located in the Lomba do Pinheiro neighborhood of Porto Alegre, the capital of Rio Grande do Sul state in southern Brazil. The plant serves a small population of 1,942 residents, reflecting its role in a localized community within the larger metropolitan region. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. Under Brazil's national environmental regulations, secondary treatment is required for most urban wastewater discharges. The plant's daily discharge volume is 518.40 cubic meters, indicating a modest operational scale consistent with its small service population. The treated effluent from ETE Esmeralda ultimately reaches the Guaíba River, which flows into the Lagoa dos Patos, one of the largest coastal lagoons in South America. This water body supports diverse aquatic life and is important for local fisheries and recreation. The plant's proximity to the coast (within 10 km) means its discharge contributes to the broader watershed health of the Patos Lagoon estuary.

ETE Esmeralda discharges into the Guaíba River, which drains into the Lagoa dos Patos, a large coastal lagoon connected to the Atlantic Ocean. The lagoon is an ecologically sensitive area that supports diverse aquatic species and serves as a critical habitat for migratory birds. The plant's secondary treatment helps reduce organic pollution, protecting downstream water quality in this important estuarine environment.