Performance evaluation of combined O3/Fenton process on decolorization and COD removal of disperse blue 79 dye from aqueous solution.

Water plays a vital, essential and important role in our life fields. Nowadays, this natural resource became scare, making a fresh and availability is a major social and environmental concern. Dyes and synthetic dyes are the major industrial pollutants and water contaminants. The wastewater discharged contains various contaminants characterized by a high content of organic matter, additives, surfactants and dyes. Effluent streams which contain dyes within wastewater make it polluted, harmful, carcinogenic and environmentally problematic. However, combined advanced oxidation processes (AOPs) such as (O₃/H₂O₂/Fe²⁺) were used and applied in this study as a novel wastewater treatment to remove color (decolorization) and chemical oxygen demand (COD) from Disperse Blue 79 (DB79) within synthetic wastewater solution. The aim of this study was to evaluate the performance efficiency of combined AOPs and examine the effect of various operational parameters such as ozone mass flow rate, hydrogen peroxide to ferrous ions (H₂O₂/Fe²⁺) mole ratio and contact time on decolorization and COD removal efficiency. According to the results obtained revealed that 93% and 85% color and COD removal efficiency respectively achieved at optimum operating conditions are 288 mg/L h ozone mass flow rate, 33.53 mole ratio (H₂O₂/Fe²⁺) and 60 min contact time. Overall it can be established that O₃/H₂O₂/Fe²⁺ process plays an important role in obtaining good results and had better performance in color and COD removal. [ABSTRACT FROM AUTHOR]