AbstractDead end ultrafiltration of Bovine Serum Albumine (BSA) using a polymeric membrane has been studied. Membrane fouling for such fine biological product due to the formation of filter cake and adsorption of the proteinaceous solution is the major bottleneck for such separation process. The application of electric pulses has shown an effective means in cleaning the membrane and reducing the fouling rate for dead-end ultrafiltration of BSA. The flux is significantly increased by both electrophoretic motion of solutes away from the membrane surface and electro-osmosis occurring in the filter cake. An automated experimental rig equipped with data acquisition system has been developed to test the effectiveness and performance of such membrane cleaning. The improvement of flux becomes more pronounced with increasing electric field strength. The effects of other processing variables such as pulse interval, pulse duration, ionic strength of the electrolyte, pH of the solution and solution concentration were studied on this membrane cleaning technique. Data are analysed for its average flux, average cake concentration, average percentage of cake and water recovery for every cleaning condition. It is found out that the chemical and physical properties of the solution (pH and ionic strength of the electrolyte) have a great effect on this membrane cleaning method. Protein solution at pH 8 and 0.0 lM ionic strength of the electrolyte gave the best membrane cleaning performance. Shorter pulse interval and with relatively 10 seconds pulse duration are the optimum conditions on application of pulse to remove the filter cake from the membrane.
Iritani, E., Ohashi, K. and Murase, T.( 1992). Analysis of filtration mechanism of dead end electroultrafiltration for proteinaceous solutions. Chem. Eng. Jpn., 25, 383 -38
Henry, J.D., Lawler, C.H and Kuo, C.H.A. (1997). A solid/liquid separation process base on cross flow and electrofiltration. AlChE Journal, 23, 851-859
Yukawa, H., Shimura, K. and Suda, A. (1983). Cross flow electrofiltration for colloidal separation of protein. Journal Chem. Eng. Japan, 16, 305-310.
Bowen, W.R. and Turner, A.D ( 1984). Electrical separation processes. In J. Gregory (ed). Solid-liquid separation, Ellis Horwood : Chichester, 9-28.
Wakeman, R.J and Tarleton, E.S. (1987). Membrane fouling prevention in cross flow microfiltration by the use electric field. Chem. Eng. Sci., 42, 829-842.
Visvanathan, C. and Ben Aim.R, (1989). Application of particles and colloidal membrane fouling in cross flow microfiltrtaion. Sep.Sci. Technol., 24, 829-842.
Moulik, S.P. (1971). Physical aspects of electrofiltration. Environ. Sci. Technol., 5, 427-432.
Jagannadh, S.N and Muralidhara, H.S. (1996). Electrokinetics to control membrane fouling. Ind. Eng. Chem. Res., 35, 1133.
Wakeman, R.J (1986). Electrofiltration: Microfiltration plus electrophoresis. Chem. Eng., No. 426, 65-70.
Bowen, W.R. and Sabuni, H.A.M.( 1992). Pulsed electrokinetic cleaning of cellulose nitrate microfiltration membranes. Ind. Eng. Chem. Res., 31, 515.
Hunter, R.J.(1981). Zeta potential in colloid science. Academic Press, London.
Bowen, W.R. and Sabuni, H.A.M.(1991). Electrically enhanced membrane filtration at low cross-flow velocity. Ind. Eng. Chem. Res., 30, 1573-1579
Robin son, C.W., Siegal, M.H. Condime, A., Fee, C., Fahidy, T., and Glick,B.R.(1993). Pulsed Electric field cross-flow ultrafiltration of Bovine Serum Albumin. J. Membrane Sci., 80, 209.
Bowen, W.R. and Ahmad, A.L (1997). Pulsed elestrophoretic filter-cake release in dead-end membrane processes. AlChE Journal, 43, 959-970.
Wakeman, R.J. and Sabri, M.N.(1995). Utilising pulsed electric field in crossflow microfiltration of Titania suspensions. Trans. Inst. Chem. Eng., 73, 455.
Ahmad, A.L. (1997). Electrophoretic membrane cleaning in dead-end ultrafiltration processes. Regional Symposium On Chemical Engineering, 281-288, UTM, Johor Bharu.
Ahmad, A.L, Ibrahim, N. and Sazali, N. (2000). Pembersihan Membran Bagi Rawatan Air Sisa Menggunakan Denyutan Medan Elektrik. Persidangan Kebangsaan AWAM 99, Lumut.
Ahmad, A.L, Ariffin, N. and Joseph, A.(1999). Force balance model in electrophoretic dead-end membrane separation process. World Engineering Congress 99, Kuala Lumpur.
Wakeman, R.J. (1982). Effect of solid concentration and pH on electrofiltration.
Filt. Sep., 19, 316-319.
Le, M.S and Howe!, J.A. (1984). Ultrafiltration. Comprehensive Biotechnology, the principles, applications and regulations of biotechnology in industry, agriculture and medicine, 2, 238-409.