ETE COAHB IV Wastewater Treatment Plant, Petrolina, Pernambuco, Brazil

ETE COAHB IV is a wastewater treatment plant located in Petrolina, Pernambuco, Brazil. The facility serves a population of approximately 25,852, placing it in the medium agglomeration category under Brazilian regulations. The plant is situated along Rodovia BR-407 in the Jardim Amazonas neighborhood. Brazil's wastewater treatment standards are governed by CONAMA Resolution 430/2011 and state-level environmental agencies. For plants of this scale, secondary treatment is typically required to meet effluent quality standards. The plant discharges into the São Francisco River basin, one of Brazil's most important water systems. The São Francisco River flows northeast through the semi-arid region of Pernambuco before reaching the Atlantic Ocean. This river supports diverse aquatic life and provides water for irrigation, drinking, and hydropower. Proper treatment is essential to protect downstream communities and ecosystems.

The plant is located in the São Francisco River basin, which drains the semi-arid region of Pernambuco and flows eastward to the Atlantic Ocean. The river supports a variety of fish species and is a critical water source for agriculture and human consumption. Downstream, the river passes through the Caatinga biome, a unique dry forest ecosystem that relies on seasonal flows. Effective wastewater treatment helps maintain water quality and ecological balance in this sensitive environment.