Characterization of gas transfer and mixing in a bubble column equipped with a rubber membrane diffuser

被引:0
|
作者
Poulsen, BR [1 ]
Iversen, JJL [1 ]
机构
[1] Odense Univ, Inst Biochem, DK-5230 Odense M, Denmark
关键词
bioreactor; elastic sparger; bubble size; oxygen transfer efficiency; characteristic mixing time; wrinkled bubbles;
D O I
10.1002/(SICI)1097-0290(19980620)58:6<633::AID-BIT9>3.0.CO;2-J
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Gas transfer and mixing were characterized in a 32-L bubble column reactor equipped with a commercially available rubber membrane diffuser. The performance of the membrane diffuser indicates that the slits in the membrane are best described as holes with elastic lids, acting as valves cutting off bubbles from the gas stream. The membrane diffuser thus functions as a one-way valve preventing backflow of liquid. Our design of the bottom plate of the reactor enabled us to optimize the aeration by changing the tension of the membrane. We thereby achieved mass transfer coefficients higher than those previously reported in bubble columns. A strong dependence of mass transfer on gas holdup and bubble size was indicated by estimates based on these two variables. The microalga, Rhodomonas sp., sensitive to chemical and physical stress, was maintained for 8 months in continuous culture with a productivity identical to cultures grown in stirred tank reactors. (C) 1998 John Wiley & Sons, Inc.
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页码:633 / 641
页数:9
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