1992 Volume 39 Issue 12 Pages 1061-1068
Surface-modified glass microfiltration membranes treated with two types of silane coupling agents (γ-APS, PFS) were applied to cross-flow filtration of beer, in order to prevent the membrane fouling. The effect of surface-modification of membrane on the permeating flux was examined, and the following results were obtained. The γ-APS-treated membrane and the PFS-treated membrane caused zeta-potential of membranes in beer, plus and minus, respectively, compared to the untreated membrane. But the blocking of membrane pore was assumed in PFS treatment. At the feed velocity of 0.5ms-1, the steady-state flux was constant, not affected by the membrane potential, on the other hand, at the feed velocity of 2.5ms-1, the steady-state flux increased with a decrease of the membrane potential. As the PFS-treated membrane was able to prevent the membrane fouling by yeast at the feed velocity of 2.5ms-1, the cake layer resistance of PFS-treated membrane was approximately 16% of that of the untreated membrane. As the result, the steady-state flux was about twice as much as that of the unteated membrane.
