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Received March 31, 2004
Accepted December 20, 2004
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Mass Transfer Characteristics and Overall Mass Transfer Coefficient in the Ozone Contactor
School of Environmental Science, Catholic University of Pusan, Busan 609-757, Korea 1Department of Chemistry, Pusan National University, Busan 609-735, Korea
jarhim@korea.com
Korean Journal of Chemical Engineering, March 2005, 22(2), 201-207(7), 10.1007/BF02701485
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Abstract
The overall mass transfer coefficient kLa, F in the flow characteristics was determined by the measurement of the diffusivity of ozone, density of aqueous solution, and viscosity. However, the measured values kLa, F in the range of 0.0096-0.0622 min-1 show large changes in hydraulic retention time, and the dissolved ozone concentration CL, F presented under 0.1 mg/l is lower than the dissolved ozone observed. The overall mass transfer coefficient kLa,M in the ozone decomposition was determined by measurement of the equilibrium dissolved ozone, overall decomposition rate constant, and overall Henry’s law constant. The measured values kLa, M are in the range of 0.0441-0.0749 min-1, and they present small changes depending on the hydraulic retention time. Furthermore, the measured dissolved ozone concentration CL,M presents a larger value than the CL, F. Then, the kLa,M is selected as an input overall mass transfer coefficient to predict the dissolved ozone requirement in the ozone contactor.
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References
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Lee JE, Choi WS, Lee JK, Korean J. Chem. Eng., 20, 943 (2003)
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Sotelo JL, Beltran FJ, Benitez FJ, Beltran-Heredia J, Water Res., 23, 1239 (1989)
Yoon JH, Decomposition of Microcystin-LR by Ozonation in Cylindrical Reactor, Ph. D. Dissertation, Pusan National University (1999)
Yoon JH, Rhim JA, Kim YT, Park TJ, Kim DY, Korean Society of Env. Eng. J., 21, 711 (1999)
Zhou H, Smith D, Water Res., 34, 909 (2000)
