FILTRATION BEHAVIORS OF ROD-SHAPED BACTERIAL BROTHS IN UNSTEADY-STATE PHASE OF CROSS-FLOW FILTRATION

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Filtration behaviors in the unsteady-state phase of crossflow filtration of broths of <I>Bacillus subtilis</I>, <I>Escherichia coli</I>, and <I>Lactobacillus delbrueckii</I>, which are rod-shaped, were studied from the viewpoint of the changes in the specific resistance and in the structure of the microbial cake formed on the membrane surface. The permeation flux followed the cake filtration law at the initial stage of the crossflow filtration of the broths of <I>B. subtilis</I> and <I>E. coli</I>, where the cells deposited randomly on the membrane. In the case of the crossflow filtration of a <I>L. delbrueckii</I> broth, the period of random deposition was shorter. The specific resistance for the cake formed at the initial stage agreed with that measured in dead-end filtration. Then, the specific resistance started to increase in comparison with that measured in dead-end filtration due to shear-induced arrangement of the cells. The extent of the increase in specific resistance became higher and the time taken to start the cell arrangement became shorter with increasing circulation flow rate. The increase in specific resistance due to the shear-induced arrangement was more appreciable in the crossflow filtration of the broth of <I>L. delbrueckii</I> than that of <I>B. subtilis</I> and <I>E. coli</I>. The average permeation flux was increased considerably by applying periodical backwashing with appropriate time intervals. The permeation flux was well predicted by the cake filtration law, since the cells deposited in a way similar to that for dead-end filtration during a sufficiently short period of crossflow filtration in a backwashing mode.

収録刊行物

  • Journal of chemical engineering of Japan

    Journal of chemical engineering of Japan 29(6), 973-981, 1996-12-01

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10003815722
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    4109685
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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