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《Environmental Science & Technology》 2012-05
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Decolorization of Textile Dyeing Wastewater by Ozonation in Multi-phase Flow Condition

YANG Li-ping1,WANG Dong1,ZHANG Shuo1,CHEN Zhi-hua1,YAO Dong-mei1,WU Wei2(1.School of Environment,Dalian University of Technology,Dalian 116024,China; 2.Qingdao Golden Source Environmental Engineering Co.Ltd,Qingdao 266555,China)  
A bench scale experiment was conducted in purpose to investigate decolorization of dyeing wastewater by ozonation in the condition of multi-phase flow,for which a solution of MB(Methylene Blue) prepared as simulated dyeing wastewater was treated through the advanced oxidation process including adsorption of activated carbon and ozonation.The influences of activated carbon,buffered pH and the hydroxyl radical scavenger on decoloriztion were studied and the results indicated that MB decolorization fit the pseudo-first-order kinetic equation;that catalytic action existed in the phase-interface could promote the decolorization;and that decolorizing rate increased with the rise of buffered pH value and the addition of sufficient hydroxyl radical scavenger(0.003 mol/L) into a strong alkaline buffer system(pH=12.7) presented the fact indicating the advantage of HCO3-over t-butanol in terms of capturing of hydroxyl radicals and furthermore,decolorization rate in this condition was still higher than that in acidic condition of pH 2.5 because of the limited capacity of the radical scavenger in controlling the path of hydroxyl radicals.
【Fund】: 国家自然科学基金项目(10172026)
【CateGory Index】: X703
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