عنوان مقاله [English]
In this article, the degradation efficiencies of UV/TiO2, UV/H2O2, and UV/O3 processes are compared in the removal of Acid Red 14 which is the most commonly used dye in the textile industry. Results show UV/TiO2 recorded a degradation efficiency of above 90% in 30 minutes (pH=3, [Dye]=40mg/L, [TiO2]=400mg/L), UV/H2O2 degraded 75mg/L of dye (a degradation efficiency of more than 90%) in 160 minutes, and the efficiency of UV/O3 was above 95% in only 15 minutes using an ozone concentration of 0.9gr/h ([Dye]=250mg/L, pH=9). Judging on their high efficiencies, the use of these processes is recommended for the treatment of textile effluents. It may be noted, however, that the two processes of UV/H2O2 and UV/O3 are effective in both dye degradation and COD removal, but UV/O3 is costly and needs especial equipment. UV/TiO2 is not effective in COD removal and requires the post-treatment separation of nano-particles (using a centrifuge or sedimentation process). Thus, the UV/H2O2 process seems to be the easiest and most effective process in the treatment of textile effluent due to its simplicity and effective COD removal in a short time.
10. <http://mimt.gov.ir>. (Aug. 2013)
11. Rasoulifard, H., Doust Mohamdi, S., Heidary, A., and Farhangina, E. (2011). “Degradation of Acid Red 14 by silver ion-catalyzed peroxy-disulfate oxidation in an aqueous solution.” Turkish J. of Eng. Env. Sci., 35,
12. Delnavaz, M. (2011). “Photo catalysis of wastewater containing phenol mediated by Nano TiO2 fixed to concrete surface.” Ph.D. Thesis of Civil and Environmental Engineering, Tarbiat Modares University, Tehran. (In Persian)
13. Tizaoui, C., Bouselmi, L., Mansouri, L., and Ghrabi, A. (2007). “Landfill leachate treatment with ozone and ozone/hydrogen peroxide systems.” J. of Hazardous Materials, 140, 316-324.
14. Gao, M., Zeng, Z., Sun, B., Zou, H., Chen, J., and Shao, L. (2012). “Ozonation of azo dye Acid Red 14 in a micro-porous tube-in-tube micro channel reactor: Decolorization and mechanism.” J. of Chemosphere,
15. Yu, C., Wu, C., Ho, T.J., of and Hong, P. (2010). “Decolorization of C.I. Reactive Black 5 in UV/TiO2, UV/oxidant and UV/TiO2/oxidant systems: A comparative study.” Chemical Engineering Journal, 158, 578-583.
16. Aleboyeh , A., Olya, M., and Aleboyeh, H. (2008). “Electrical energy determination for an azo dye decolorization and mineralization by UV/H2O2 advanced oxidation process.” Chemical Engineering Journal, 137, 518-524.
17. Pillai, K., Kwon, T., and Moon, I. (2009). “Degradation of wastewater from terephthalic acid manufacturing process by ozonation catalyzed with Fe2+, H2O2 and UV light: Direct versus indirect ozonation reactions.” J. of Applied Catalysis B: Environmental, 91, 319-328.
18. Kurniawan, T., Lo, W., and Chan, G. (2006). “Radicals-catalyzed oxidation reactions for degradation of recalcitrant compounds from landfill leachate.” Chemical Engineering Journal, 125, 35-57.
19. Liu , C., Hsieh, Y., Lai, P., Li, C., and Kao C. (2006). “Photo-degradation treatment of azo dye wastewater by UV/TiO2 process.” J. of Dyes and Pigments, 68 ,191-195.
20. Shu, H., and Hsieh, W. (2006). “Treatment of dye manufacturing plant effluent using an annular UV/H2O2 reactor with multi-UV lamps.” J. of Separation and Purification Technology, 51, 379-386.
21. Elmorsi, T., Riyad, Y., Mohamed, Z., and Abd El Bary, H. (2010) “Decolorization of mordant Red 73 azo dye in water using H2O2/UV and photo-fenton treatment.” J. of Hazardous Materials, 174, 352-358.
22. Guyer, G., and Ince, N. (2004). “Individual and combined effects of ultrasound, ozone and UV irradiation: A case study with textile dyes.” J. of Ultrasonics, 42, 603-609.
23. Bansal, P., Singh, D., and Sud, D. (2010). “Photo catalytic degradation of azo dye in aqueous TiO2 suspension: Reaction pathway and identification of intermediates products by LC/MS.” J. of Separation and Purification Technology, 72, 357-365.
24. Chang, M., Chung, C., Chern, J., and Chen, T. (2010). “Dye decomposition kinetics by UV/H2O2: Initial rate analysis by effective kinetic modeling methodology.” J. of Chemical Engineering Science, 65, 135-140.
25. Turhan, K., and Turgut, Z. (2009). “De-colorization of direct dye in textile wastewater by ozonation in a semi-batch bubble column reactor.” J. of Desalination, 242, 256-263.
26. Song, S., Xu, X., Xu, L., He, Z., Ying, H., Chen, J., and Yan, B. (2008). “Mineralization of C.I. Reactive Yellow 145 in aqueous solution by ultraviolet- enhanced ozonation.” J. of Ind. Eng. Chem. Res, 47, 1386-1391.