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	Enhanced ozonation of simulated dyestuff wastewater by microbubbles
	Chu, Li-Bing ; Xing, Xin-Hui ; Yu, An-Feng ; Zhou, Yu-Nan ; Sun, Xu-Lin ; Jurcik, Benjamin
	2010-05-07 ; 2010-05-07
关键词	microbubbles ozonation mass transfer hydroxyl radical dyestuff wastewater STIRRED-TANK REACTOR AQUEOUS-SOLUTIONS MASS-TRANSFER AZO-DYE OZONE DEGRADATION Environmental Sciences
中文摘要	The ozonation of synthetic wastewater containing azo dye, CI Reactive Black 5, was investigated using a microbubble generator and a conventional bubble contactor. The microbubble generator produced a milky and high intensity microbubble solution in which the bubbles had a mean diameter of less than 58 pm and a numerical density of more than 2.9 x 104 counts ml(-1) at a gas flow rate of less than 0.5 1 min(-1). Compared with the bubble contactor, the total mass transfer coefficient was 1.8 times higher and the pseudo-first order rate constant was 3.2-3.6 times higher at the same initial dye concentration of 100 mg 1(-1), 230 mg 1-1 and 530 mg 1-1 in the proposed microbubble system. The amount of total organic carbon removed per g of ozone consumed was about 1.3 times higher in the microbubble system than in the bubble contactor. The test using tereptithalic acid as the chemical probe implied that more hydroxyl radicals were produced in the microbubble system, which contributed to the degradation of the dye molecules. The results suggested that in addition to the enhancement of mass transfer, microbubbles, which had higher inner pressure, could accelerate the formation of hydroxyl radicals and hence improve the oxidation of dye molecules. (C) 2007 Elsevier Ltd. All rights reserved.
语种	英语 ; 英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/17183]
专题	清华大学
推荐引用方式 GB/T 7714	Chu, Li-Bing,Xing, Xin-Hui,Yu, An-Feng,et al. Enhanced ozonation of simulated dyestuff wastewater by microbubbles[J],2010, 2010.
APA	Chu, Li-Bing,Xing, Xin-Hui,Yu, An-Feng,Zhou, Yu-Nan,Sun, Xu-Lin,&Jurcik, Benjamin.(2010).Enhanced ozonation of simulated dyestuff wastewater by microbubbles..
MLA	Chu, Li-Bing,et al."Enhanced ozonation of simulated dyestuff wastewater by microbubbles".(2010).

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