Journal ArticleDOI
Flow Characteristics in Cocurrent Upflow Bubble Column Dispersed with Micro-Bubbles
Yoshiyuki Bando,Takashi Yoshimatsu,Wenji Luo,Yufei Wang,Keiji Yasuda,Masaaki Nakamura,Yasuhiro Funato,Masataka Oshima +7 more
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TLDR
In this article, a micro-bubble generator was installed at the bottom of the column, and for comparison the sintered glass gas sparger was set at the lower part of column.Abstract:
The flow characteristics and decomposition performance in the cocurrent upflow bubble column dispersed with micro-bubbles were experimentally examined. A micro-bubble generator was installed at the bottom of the column, and for comparison the sintered glass gas sparger was set at the lower part of the column.When milli-bubbles coexist with dispersed micro-bubbles, micro-bubbles disappear. This is considered because micro-bubbles are absorbed into the wake of milli-bubbles. The volumetric mass transfer coefficient is higher for micro-bubbles than for milli-bubbles, but the mass transfer coefficient is much lower for the former than for the latter. The apparent decomposition rate constant strongly depends on the volumetric coefficient. When the volumetric coefficient is higher, the rate constant of micro-bubbles is higher than that of milli-bubbles.read more
Citations
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Microbubble-aided water and wastewater purification: a review
TL;DR: In this paper, the authors analyzed the properties of microbubbles from the perspective of appli- cation, and the correlations to predict the volumetric mass transfer coef- ficient have been presented.
Journal ArticleDOI
Enhanced free-radical generation by shrinking microbubbles using a copper catalyst.
TL;DR: In this article, copper was found to enhance the generation of hydroxyl radicals from collapsing oxygen microbubbles under acidic conditions through electron-spin-resonance spectroscopy analysis, which greatly increase the potential of the microbubble-collapse technique for use in the field of wastewater treatment.
Journal ArticleDOI
Degradation of phenol by the collapse of microbubbles.
TL;DR: It is verified that collapsing air microbubbles lead to the decomposition of phenol, a common pollutant, and it is suggested that hydroxyl radicals play an important role in the phenol decomposition process.
Journal ArticleDOI
The role of interface in microbubble ozonation of aromatic compounds
TL;DR: It is found that microbubbles decomposition of pollutants was markedly more efficient than conventional bubbles in terms of ozone consumption and shed light on the mechanism of interfacial reaction in microbubble ozonation.
Journal ArticleDOI
Oxidation of Dimethyl Sulfoxide in Aqueous Solution Using Microbubbles
Pan Li,Hideki Tsuge,Keiko Itoh +2 more
TL;DR: In this article, an ozone microbubble generator was used to increase ozone transfer efficiency in the aqueous solution of DMSO-containing wastewater in semiconductor manufacturing industry.
References
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Journal ArticleDOI
The continuous phase heat and mass transfer properties of dispersions
P.H. Calderbank,M.B. Moo-Young +1 more
TL;DR: In this paper, the authors measured the interfacial area in gas-liquid dispersions and correlated the data with other published data for heat and mass transfer in liquid-liquid and solid-gas dispersions in which the dispersed phases are free to move under the action of gravity.
Journal ArticleDOI
Bubble Size, Interfacial Area, and Liquid-Phase Mass Transfer Coefficient in Bubble Columns
Kiyomi Akita,Fumitake Yoshida +1 more
Journal ArticleDOI
Ozone Transfer in a New Gas-Induced Contactor with Microbubbles
Pan Li,Hideki Tsuge +1 more
TL;DR: In this article, a new microbubble generation system was developed and applied to an ozone contactor, and its characteristics were investigated in a semi-batch bubble column at different gas and water flow rates.