https://scholars.lib.ntu.edu.tw/handle/123456789/63928
標題: | 軟粒子之固液分離─子計畫五:粒子與膜材間之作用對微過濾效能之影響 Effect of particle-membrane interaction on microfiltration |
作者: | 王大銘 | 關鍵字: | 微過濾;結垢現象;蛋白質;濾速衰減;microfiltration;fouling;protein;flux decline | 公開日期: | 30-十月-2000 | 出版社: | 臺北市:國立臺灣大學化學工程學系暨研究所 | 摘要: | 在微過濾程序中,由蛋白質粒子 與膜材間的交互作用所引發的結垢 現象,是影響過濾效能的主因。本研 究採用牛血清蛋白與蝕刻性 polycarbonate 微孔膜,進行恆壓過 濾,藉以探討蛋白質過濾的結垢現 象。經由濾速分析,阻力分佈分析, 掃瞄式電子顯微鏡(SEM ),及原子 力電子顯微鏡(AFM )等實驗,可發 現結垢產生的過程是由蛋白質聚集 體在濾膜孔口附近進行架橋作用產 生阻塞,之後轉為外部的濾餅過濾, 並引發蛋白質單體的沈積,導致過濾 阻力大幅提昇。阻力的來源可分為兩 部份,一部份是蛋白質聚集體吸附於 膜面上所產生的不可逆阻力;另一部 份則是由蛋白質單體沈積以及蛋白 質濾餅受壓縮所產生的可逆阻力。過 濾初期時,由不可逆阻力主導總阻 力,到了後期時,則由可逆阻力主 導。此外,蛋白質濃度、過濾壓差及 pH 值等操作變數對濾速衰減及阻力 分佈的影響亦是研究的重點。 Protein fouling, initiated by the interaction between proteins and mem-branes, is the major reason for the decline of filtration flux in microfiltration. In this project, experiments were performed with bovine serum albumin and track-etched polycarbonate membranes to evaluate how fouling affects the microfiltration process. On basis of the measurement of filtration flux and resistance distribution, and the analyses of SEM and AFM, it can be found that the fouling process is initiated by the adsorption of BSA aggregates near the membrane pores, and an external cake then forms which is composed of BSA monomers and aggregates. The analysis suggests that the irreversible adsorption of BSA aggregates and the reversible adsorption of monomers are two major mechanisms for fouling. In the beginning of filtration, the adsorption of BSA aggregates is the dominant mechanism for fouling. And in the later period of filtration, the adsorption of BSA monomers and the compression of the external cake are responsible for the growth of resistance. In addition, the effects of operation variables, such as protein concentration, pressure difference, and pH values, on flux decline and resistance distribution have also been investigated. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/9240 | 其他識別: | 892214E002012 | Rights: | 國立臺灣大學化學工程學系暨研究所 |
顯示於: | 化學工程學系 |
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892214E002012.pdf | 1.04 MB | Adobe PDF | 檢視/開啟 |
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