ETE Cajazeiras Mossoró - Wastewater Treatment Plant in Mossoró, Rio Grande do Norte

ETE Cajazeiras Mossoró is a wastewater treatment plant located in Mossoró, a city in the state of Rio Grande do Norte, Brazil. The plant serves a population of approximately 62,620 residents, placing it in the medium agglomeration category for Brazilian wastewater infrastructure. Brazil's wastewater treatment standards are governed by CONAMA Resolution 430/2011 and the National Water Resources Policy. For plants serving populations of this scale, secondary treatment is typically required to reduce organic load and suspended solids before discharge. The plant discharges into the local watershed, which ultimately drains into the Atlantic Ocean via the Apodi-Mossoró River system. This region is part of the semi-arid Northeast of Brazil, where water resources are critical for both human consumption and ecosystem health. Proper treatment helps protect downstream water quality and supports aquatic life in the river basin.

The plant is located in the Apodi-Mossoró River basin, which flows through the semi-arid Caatinga biome before reaching the Atlantic Ocean near the city of Areia Branca. This region supports diverse aquatic and terrestrial species adapted to seasonal rainfall patterns. The river provides water for irrigation, livestock, and domestic use, making effective wastewater treatment essential to prevent eutrophication and maintain water quality for downstream communities and coastal ecosystems.