Abstract
The degradations characteristic of azo dye Reactive Green 19 (RG19) was investigated using advanced oxidation process (AOPs). It was evaluated based on colour and chemical oxygen demand (COD) removal. The effect of operational parameters such as initial dye concentration, initial dosage of hydrogen peroxide (H2O2), contact time, and pH was also being studied. The samples were treated by ozonation (O3) and peroxone O3/H2O2process. Advanced oxidation processes (AOPs) involve two stages of oxidation; firstly is the formation of strong oxidant and secondly the reaction of organic contaminants in water. In addition, the term advanced oxidation is referring to the processes in which oxidation of organic contaminants occurs primarily through reactions with hydroxyl radicals. There are several analyses that use to determine the efficiency of the treatment process, which are UV-Vis absorption spectra, COD, Fourier Transform Infrared (FT-IR), and pH. The results demonstrated that the ozone oxidation was efficient in decolourization and good in mineralization, based on the reduction of colour and COD. Additionally, results indicate that H2O2is able to perform better than ozonation in order to decolourize the dye wastewater with 0.5 mL H2O2/L dye dosage of H2O2at different initial concentration, initial pH, with contact time.
Highlights
The industrial wastewater pollution is a serious problem that impacts negatively on the environment especially water resources
In order to get the most suitable and economical process, it is important that appropriate contact time, H2O2 dosage, and pH are being determined
0.5 mL H2O2/L dye was selected as the optimum dosage and the dosage has been used to treat Reactive Green 19 (RG19) for higher concentration (300 and 500 mL H2O2/L dye COD Concentration (mg/L))
Summary
The industrial wastewater pollution is a serious problem that impacts negatively on the environment especially water resources. The biggest industrial wastewater comes from textile, leather, paper and other dying industries. The treatment of industrial wastewater poses significant problems in wastewater treatment industry. The AOPs have become the most promising procedures to treat dye-containing in terms of effective decolourization and degradation of the refractory pollutants [1]. Most AOPs are based on the generation of reactive species, hydroxyl radicals which degrade a broad range of organic pollutants quickly and non-selectively. The oxidation potential of hydroxyl radicals (2.80V) exceeds that of O3 (2.08V)
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