軟膠體之壓縮及微過濾機構之研究

淡江大學機構典藏 > 工學院 > 化學工程與材料工程學系暨研究所 > 會議論文 > Item 987654321/79326

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題名:	軟膠體之壓縮及微過濾機構之研究
其他題名:	Studies on mechanisms of compression and microfiltration of soft particles
作者:	黃國楨;Hwang, K .J.;王雅婷;Wang, Y.T.
貢獻者:	淡江大學化學工程與材料工程學系
關鍵詞:	微過濾;軟膠體;濾餅性質;濾餅壓縮;microfiltration;soft colloids;cake property;cake compression
日期:	2008-09
上傳時間:	2012-12-03 22:06:11 (UTC+8)
出版者:	臺北市：行政院國家科學委員會
摘要:	本研究旨在探討軟膠體粒子之微過濾機構及壓縮性質。本研究採用三種不同分子量(70 kDa ' 500 kDa 及 2000 kDa) 的葡聚酵分別與過錳酸鉀交聯成葡聚醣-二氧化錳(Dextran-MrlO2)之多孔性軟膠體，此種膠體粒子會在受到壓縮後變形，並擠壓出內部水分。實驗結果發現，此三種不同之軟膠體雖有相近的粒徑分佈、介達電位及密度，但由於其機械強度及壓縮性質導致其過港、行為有顯著之差異;當葡聚醣分子量越大，粒子的壓縮變形越快達穩定，且由於葡聚醣分子量大的粒子越快壓縮成緻密層(skin layer) ，故其過濾、速度會最慢，而掃流速度增加，粒子所受的剪切力增加，但不同時間下粒子的壓密程度不同，導致擬穩定;在遠不會隨著增加。此外，本研究利用J慮、面上粒子之力平衡解析，探討操作條件對濾餅成長的影響，發現葡聚醣分子量越大，粒子的附著機率越小，導致初始濾餅易壓縮地越緻密，故粒子成長厚度越簿，阻力越大。The mechanisms of compression and microfiltration of soft particles are studied. Different kinds of Dextran-MnO gel particles are prepared depending on 2 different molecular weights of dextran (70, 500 and 2000 kDa). The porous soft particles are filtered in "dead-end" and "cross-flow" microfiltration, respectively. Although the mean sizes, zeta potentials and densities of these particles are almost the same, their filtration characteristics are far different due to their mechanical strengths and compressibility. The deformation and compression of particles may reach the pseudo-steady state more quickly for the particles constructed with higher molecular weight of dextran. The quicker skin-layer formation leads to a lower filtration rate. Although the shear stress acting on the membrane surface increases with increasing cross-flow velocity, whether the pseudo-steady filtration rate will be increased or not is dependent on the cake compression course. Moreover, the probabilities of particle deposition on the membrane surface under various conditions are estimated based on a force balance model. An increase in the molecular weight of dextran causes the cake compression to be more serious and the filtration rate to be lower.
關聯:	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)
顯示於類別:	[化學工程與材料工程學系暨研究所] 會議論文

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