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    Title: 生物懸浮液的通氣掃流微過濾之探討
    Other Titles: A study on gas-sparging cross-flow microfiltration of bio-suspension
    Authors: 許指恩;Hsu, Chin-en
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    黃國楨;Hwang, Kuo-jen
    Keywords: 掃流微過濾;濾餅性質;通氣;生物分離;cross-flow microfiltration;cake property;Gas-sparging;bio-separation
    Date: 2007
    Issue Date: 2010-01-11 05:38:48 (UTC+8)
    Abstract: 本研究旨在研究生物懸浮液的通氣掃流微過濾之影響,並探討對操作條件對,例如氣體之流量、過濾壓差、液體速度,濾速、濾餅性質及濾面上剪切力之影響。實驗中使用平均孔徑為0.1μm的醋酸纖維膜過濾平均粒徑為4.7μm之酵母菌粒子。實驗結果顯示,隨通氣量越大時,作用於濾面上剪切力也越大,濾餅量顯著減少,但是也會導致濾餅平均過濾比阻增加;綜合濾餅量與過濾比阻兩個因素,濾餅阻力會隨著通氣量之增加而增加,導致濾速下降。故平均過濾比阻是影響濾速與過濾阻力的主要因素。掃流速度越快對擬穩定率速能夠提升,但超過0.3m/s反而會下降。過濾壓差增加並不能對穩定濾速有顯著的提昇。本研究並利用多相流理論算出膜面上剪切力,並與實驗值比較,發現理論值需要經由修正才能符合實驗結果。而氣體流量對該修正因子之影響較小,液體速度則影響較大,因此將修正係數與液體速度回歸成一個關係式。
    The gas-sparging cross-flow microfiltration of bio-suspension is studied. The effects of operating conditions, such as liquid velocity, gas velocity and filtration pressure, on the filtration rate, cake properties, shear stress acting on the membrane surface are discussed. A filter membrane made of mixed cellulose ester with a mean pore size of 0.1μm is used for filtering 4.7μm yeast cells . An increase in gas flow rate leads the shear stress on the membrane surface and the average specific filtration resistance of cake to increase ,but the cake mass to decrease. To take these factors into consideration, the overall filtration resistance is increased and the filtration rate is decreased with the increasing the flow rate of sparging gas. In addition ,the filtration rate increases with the increase of liquid velocity under low velocity range. When liquid velocity exceeds 0.3 m/s, a contrary tendency is obtained. This is because the cake structure becomes more compact. Since the average specific filtration resistance of cake plays the major role in determining filtration resistance to operate under low liquid velocity range can enhance the filtration rate .Comparing the data of shear stress estimated by theory and measured in experiments, a correction factor should be taken into account.
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Thesis

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