逆洗與通氣對管式薄膜過濾蛋白質溶液濾速增進之探討

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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:	鄭東文;Cheng, Tung-wen;鄭運馨;Cheng, Yun-hsin
Contributors:	淡江大學化學工程與材料工程學系
Keywords:	薄膜過濾;逆洗;通氣;結垢;Membrane filtraton;BSA;Back washing;Gas-sparging;Fouling
Date:	2008
Issue Date:	2012-12-03 23:30:08 (UTC+8)
Publisher:	臺北市：行政院國家科學委員會
Abstract:	本研究以掃流式無機薄膜過濾系統探討在不同操作方法及操作參數下之蛋白質溶液過濾行為與結垢現象，實驗溶液為BSA，操作參數有透膜壓差、濃度、pH值、液體速度、氣體速度及逆洗頻率等。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港、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 粒子吸附於且其面，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。In this study, the inorganic membranes were employed in a cross-flow filitration system to discuss the flux and fouling behavior of protein solutions under various solution properties and operating parameters to search the manner for increasing the flux. BSA was selected as the testing solution and the operating parameters such as transmembrane pressure, solution concentration, pH value, liquid velocity, air velocity and back washing frequency. 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%.
Relation:	2008年輸送現象及其應用研討會論文摘要集 ( 2008 Symposium of transport phenomena and applications abstract book)
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Proceeding

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