Treatment of Reactive Dyeing Wastewater by Different Advanced Oxidation Processes

This study makes investigation the effectives of the photo-Fenton's reagents in treatment of reactive dyeing wastewater under different operational conditions, such as, different concentrations of reactive azo dye C.I.Reactive Red 12 ( RR12 ), hydrogen peroxide [H2O2]concentrations and[Fe2+],[ Fe3+] concentrations. Oxidation by photo- Fenton and photo- Fenton-like reactions is an economically feasible process for degradation of a variety of hazardous pollutants in wastewater from dyeing and printing industries. Results indicated that by increasing the initial concentration of H2O2 , Fe2+and Fe3+ ,the rate of ( RR 12) decolorization was enhanced; however, the rate of ( RR12) decolorization decreased with an increase in the initial concentration of RR 12. The decolorization rate of reactive dye in the presence of various advanced oxidation processes ( AOPs ) obeyed the following order : photo- Fenton > photo- Fenton-like > UV/H2O2 and the color removal was found also to depend on dye structure.

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