ETE PARELHAS Wastewater Treatment Plant, Parelhas, Rio Grande do Norte, Brazil

ETE PARELHAS is a wastewater treatment plant located in Parelhas, a municipality in the state of Rio Grande do Norte, Brazil. The plant serves a population of approximately 14,647 people, placing it in the small to medium agglomeration category. It is situated in the semi-arid region of northeastern Brazil, where water resources are scarce and treatment is critical for public health and environmental protection. Brazil's wastewater treatment standards are governed by federal resolutions such as CONAMA 430/2011, which set effluent quality requirements for discharge into water bodies. For plants of this scale, secondary treatment is typically expected to reduce organic load and pathogens. The plant's location in a water-stressed region underscores the importance of effective treatment for water reuse and aquifer recharge. The treated effluent from ETE PARELHAS likely discharges into local watercourses that drain into the Piranhas-Açu River basin, eventually reaching the Atlantic Ocean. The region's semi-arid climate means that maintaining water quality in these intermittent rivers is vital for downstream communities and ecosystems, including the Apodi-Mossoró estuary.

The plant's discharge flows into the Piranhas-Açu River basin, which drains into the Atlantic Ocean via the Piranhas River. This basin supports diverse aquatic life and is an important water source for agriculture and human consumption in the semi-arid Northeast region. Proper treatment helps prevent eutrophication and protects downstream ecosystems, including mangroves and coastal habitats.