巨分子溶液恆壓過濾行為之探討

簡吟真

doi:10.6846/TKU.2007.00788

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巨分子溶液恆壓過濾行為之探討

Investigation on Filtration Behavior of Macromolecules Solutions in Dead-end Filtration

簡吟真 , Masters　　Advisor：鄭東文　　

繁體中文 DOI： 10.6846/TKU.2007.00788

恆壓過濾；濾速下降；蛋白質；攪拌； pH值； Dead-end filtration ； Flux decline ； Protein ； Stirred ； pH value

Abstract │ Reference (67) │ Altmetrics

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In this study, commercialized polymer membranes(1,000 and 5,000 Da MWCO, OMEGA) were employed in a dead-end filtration system to investigate the effect of operation conditions, solutions and membrane properties on filtration. The solution fluxes, resistance and solute rejection were discussed under various operating parameters such as transmembrane pressure, concentration, pH value, solution composition and stirred velocity. In addition, the calculated filtration resistance by using resistance-in-series model and the predicting flux of BSA solution using the osmotic pressure model had been discussed. 
For BSA and β-cyclodextrin binary solution, the rejection of β-cyclodextrin varies with the pH value, and the rejection with stirring increases. In the case of MWCO 5k membrane, the rejection of β-cyclodextrin is approximately 50% at pH=4.9 and near 10% at pH=10. This is due to the fact that the porosity of the polarization layer of BSA on the membrane surface varies with pH value. No matter 1k or 5k membrane but without stirring, the rejection of β-cyclodextrin is near zero；However, in the stirring system, the rejection of β-cyclodextrin by the 1k membrane is higher than 90%. The result indicates that, the cake property of BSA layer has significant influence on the rejection of β-cyclodextrin, and lead to reducing separation selectivity.
In osmotic pressure model, the trends of theoretical flux agree with experiment flux. At high transmembrane pressures, the theoretical flux apparently reached a plain, while the flux decline tendency was not obvious in the experiment. This is due to the shear stress caused by the stirring system can eliminate the concentration polarization layer of BSA effectively. The osmotic pressure model considers the osmotic pressure caused the concentration polarization layer but neglects the effect of membrane fouling on flux. Therefore, the theoretical flux is higher than the experimental data.

Reference ( 67 ) 〈TOP〉

Aimar, P., J. A. Howell, M. J. Clifton, and V. Sanchez, "Concentration polarization build-up in hollow fibers: A method of measurement and its modelling in ultrafiltration," J. Membr. Sci., 59 (1991) 81-99.
連結：
Bauser, H., H. Chmiel, N. Stroh, E. Walitza, "Control of concentration polarization and fouling of membranes in medica, food and biotechnical application", J. Membr. Sci., 27 (1986) 195-202.
連結：
Blanpain,P., J. Hermia, M. Lenoel, "Mechanisms governing permeate flux and protein rejection in the microfiltration of beer with a Cyclopore membrane", J. Mem. Sci., 84 (1993), 37-51.
連結：
Blatt, W.F., A. Dravid, A.S. Michales, L. Nelsen, "Solute polarization and cake formation in membrane ultrafiltration: causes, consequences, and control techniques", in: J.E. Filnn, ed., Membrane Science and Technology, Plenum Press, New York (1970) 47-91.
連結：
Bowen, W.R., A.W. Mohammad, "Diafiltration by nanofiltration: prediction and optimization", AIChE J., 44 (1998) 1799-1812.
連結：

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