ETE Pavuna Wastewater Treatment Plant, Rio de Janeiro, Brazil

ETE Pavuna is a large-scale wastewater treatment plant located in the Vigário Geral neighborhood of Rio de Janeiro, Brazil. Serving a population of over 430,000, it is a key component of the city's sanitation infrastructure, situated in the densely populated metropolitan region. As a plant of this scale in Brazil, ETE Pavuna is subject to national regulations under CONAMA resolutions and state-level environmental licensing. For agglomerations serving more than 100,000 people, secondary treatment is typically required, and the plant's designed capacity of 1.00 cubic meters per second indicates substantial infrastructure. The plant discharges treated effluent into the Guanabara Bay watershed, a large coastal bay that receives multiple urban rivers. The bay supports diverse aquatic life and is an important ecological and economic resource for Rio de Janeiro, though it faces significant environmental pressures from urbanization.

ETE Pavuna discharges into the Guanabara Bay basin, which drains into the Atlantic Ocean. The bay is a semi-enclosed estuary that supports mangroves, fish, and bird species, and is a vital nursery for marine life. Urban runoff and industrial inputs have historically impacted water quality, making treatment plants like ETE Pavuna crucial for reducing pollutant loads and protecting downstream coastal ecosystems.