Effects of Feed Component and Membrane Property on Cross-flow Ultrafiltration in Flat-Sheet Module

• Main Authors: Hsin-Pei Chou, 周欣霈
• Other Authors: Tung-Wen Cheng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/92170960245095107294

碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 96 === In this study, polymer membranes were employed in a cross-flow ultrafiltration system to investigate the effects of solution compositions and membrane properties on filtration. The solution fluxes, solute rejections and filtration resistances were discussed under various operating parameters such as liquid velocity, pH value and transmembrane pressure. Experimental results indicate that the difference in the hydrophobicity between the feed solution and membrane generates an exclusion force to retard the formation of fouling layer on the membrane surface. Such as the case of filtration of BSA solution by the RCA membrane, a high permeate flux is achieved due to the low fouling propensity. When the pH value is far away the BSA isoelectric point, the porosity of BSA deposited layer is high due to exclusion between the BSA molecules and results in high flux. In the binary solutes system, cause by the internal fouling of β-cyclodextrin, the flux of solution containing β-cyclodextrin is lower than that of pure BSA solution. On the other, BSA molecules have strong fouling propensity to PES membrane, the transmission of β-cyclodextrin is lowered due to the compact BSA deposited layer and becomes lower as the applied pressure increases that will reduce the separation selectivity.