Relationship between Cake Structure and Membrane Pore Size in Crossflow Filtration of Microbial Cell Suspension Containing Fine Particles
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概要
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The structural change of a filter cake and its effect on permeation flux in crossflow filtration of a suspension containing particles different in size were studied. A suspension containing yeast cells (5 μm in average diameter) and polystyrene latex particles (0.5 μm) with different compositions was used as a model. The change in the structure of the filter cake formed on the membrane surface was observed by using a scanning electron microscope. When the pore size was smaller than the latex particle size, a yeast cell layer containing latex particles was formed on the membrane at the initial stage of filtration. Then, the yeast cell layer was replaced by the latex particle layer. The increase of the circulation flow rate decreased the amount of the filter cake to increase the permeation flux in this case. On the other hand, when the membrane pore size was larger than the latex particle size, a yeast cell layer was first formed on the membrane surface followed by deposition of latex particles on it. The permeation flux was relatively higher than the former case. However, the permeation flux slightly increased with the increase of the circulation flow rate although the weight of the filter cake decreased in the latter case. Thus, a small amount of the latex particles in the cell suspension considerably decreased the permeation flux in crossflow filtration of the suspension. In addition the dependence of the permeation flux on the circulation flow rate was proved to be different whether the small particles were smaller than the membrane pores. These findings including the structure of the filter cakes will be helpful to understand the permeation behaviors in the crossflow filtration of microbial broths which usually contain small particles.
- 社団法人 化学工学会の論文
- 2001-12-01
著者
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Tanaka Takaaki
Department of Materials Science and Technology, Niigata University
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Taniguchi Masayuki
Department Of Materials Science And Technology Niigata University
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Nakanishi Kazuhiro
Department Of Anesthesia Nippon Medical School
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Nagano Tetsuya
Department Of Bioscience And Biotechnology Okayama University
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Taniguchi Masayuki
Department Of Cardiology Jikei University School Of Medicine Daisan Hospital
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Tanaka Takaaki
Department Of Geoscience Joetsu University Of Education
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YAMAGIWA Yoshinobu
Department of Bioscience and Biotechnology, Okayama University
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Tanaka Takaaki
Department Of Biotechnology Faculty Of Engineering Okayama University
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Yamagiwa Yoshinobu
Department Of Bioscience And Biotechnology Okayama University
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Nakanishi Kazuhiro
Deparment Of Food Science And Technology Faculty Of Agriculture Kyoto University
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Nakanishi Kazuhiro
Department Of Bioscience And Biotechnology Okayama University
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Tanaka Takaaki
Department Of Bioscience & Biotechnology Faculty Of Engineering Okayama University
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