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    Title: 逆洗與通氣對管式薄膜過濾蛋白質溶液濾速增進之探討
    Other Titles: Flux enhancement by backwashing and gas-sparging in tubular membrane filtration of protein solution
    Authors: 鄭運馨;Cheng, Yun-hsin
    Contributors: 淡江大學化學工程與材料工程學系碩士班
    鄭東文;Cheng, Tung-wen
    Keywords: 薄膜結垢;等電點;逆洗;通氣;Membrane fouling;Isoelectric point;Backwashing;Gas-sparging
    Date: 2008
    Issue Date: 2010-01-11 05:46:02 (UTC+8)
    Abstract: 本研究以掃流式無機薄膜過濾系統探討蛋白質溶液之過濾行為與結垢現象,並尋求提升濾速之操作方式。實驗溶液為BSA溶液,操作參數有透膜壓差、濃度、pH值、液體速度、氣體速度、逆洗頻率等,另也計算薄膜過濾之各項阻力,及以淨濾速比較不同操作方式之性能。
    實驗結果顯示,pH值為3時濾速最高、pH值為7時次之、pH值為4.9時濾速最低,由於濃度極化層的阻力與BSA之電性及形狀有關,pH值為3時BSA為帶狀且表面帶電,濃度極化層不易堆積,因此濾速最高,pH值為4.9時,BSA為球狀且表面不帶電,因此所形成之濃度極化層最緻密,使得濾速最低。而由不同操作方式之淨濾速分析可知,通氣為最佳的操作方式,逆洗會因清洗耗去的濾液量而使濾速低於一般過濾。通氣可移除濃度極化層,防止BSA粒子吸附於膜面,且不需耗費濾液清洗,因此具有最高的淨濾速, pH值為3時,通氣約可提高60%之濾速。
    Inorganic membranes were employed in a cross-flow filtration system for investigating the flux behavior and membrane fouling of BSA solutions. The operating parameters included transmembrane pressure, solution concentration, pH value, liquid velocity, air velocity and backwashing frequency. The filtration resistances were also evaluated and the net permeate flux was considered in order to compare the performances of various operation modes,
    For varying the pH, the experimental results show that the permeate flux is maximum at pH = 3 and is minimum at pH = 4.9. The BSA particle’s shape and surface charge were determined by the pH value. At pH = 3, the BSA molecules are linear with surface charge, the BSA polarization layer in the filtration has a loose structure results in a lower filtration resistance.. At pH = 4.9, a compact BSA polarization layer’s structure was formed due to the neutral and nearly spherical BSA molecues. Basing on the analysis of net permeate flux, the gas sparging method is better than the backwashing for flux enhancement. The gas sparging can effectively remove the polarization layer and reduce the BSA deposition on the membrane. Furthermore, no permeate is wasted for washing in gas sparging. At pH =3, the flux increment by gas sparging is up to 60%.
    Appears in Collections:[化學工程與材料工程學系暨研究所] 學位論文

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