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The influence of polymeric membrane gas spargers on hydrodynamics and mass transfer in bubble column bioreactors
- 作者:Gossaye Tirunehe ; B. Norddahl
- 关键词:Bubble column ; Membrane sparger ; Bubble size distribution ; Interfacial area ; Overall mass transfer coefficient
- 刊名:Bioprocess and Biosystems Engineering
- 出版年:2016
- 出版时间:April 2016
- 年:2016
- 卷:39
- 期:4
- 页码:613-626
- 全文大小:1,504 KB
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- 作者单位:Gossaye Tirunehe (1)
B. Norddahl (1)
1. Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Campusvej 55, 5230, Odense M, Denmark
- 刊物类别:Chemistry and Materials Science
- 刊物主题:Chemistry
Biotechnology Industrial Chemistry and Chemical Engineering Industrial and Production Engineering Waste Management and Waste Technology Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution Food Science
- 出版者:Springer Berlin / Heidelberg
- ISSN:1615-7605
文摘
Gas sparging performances of a flat sheet and tubular polymeric membranes were investigated in 3.1 m bubble column bioreactor operated in a semi batch mode. Air–water and air–CMC (Carboxymethyl cellulose) solutions of 0.5, 0.75 and 1.0 % w/w were used as interacting gas–liquid mediums. CMC solutions were employed in the study to simulate rheological properties of bioreactor broth. Gas holdup, bubble size distribution, interfacial area and gas–liquid mass transfer were studied in the homogeneous bubbly flow hydrodynamic regime with superficial gas velocity (U G) range of 0.0004–0.0025 m/s. The study indicated that the tubular membrane sparger produced the highest gas holdup and densely populated fine bubbles with narrow size distribution. An increase in liquid viscosity promoted a shift in bubble size distribution to large stable bubbles and smaller specific interfacial area. The tubular membrane sparger achieved greater interfacial area and an enhanced overall mass transfer coefficient (K La) by a factor of 1.2–1.9 compared to the flat sheet membrane.
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