| Abstract |
| This study investigated the permeation behavior of A1203 colloids on regenerated cellulose microfiltration membrane. To examine the effect of operation variation on permeation behavior, operating pressure was increased from 0.29 bar to 1.18 bar along with time and then was reduced to 0.29 bar reversely, Cross flow microfiltration module with the capillary PE membrane of nominal pore size of 0.20 and 0.45ion was used in the experiment. Fouling experiments were performed at 20t and at a constant flow rate of 24 L/hr. 200 and 1000 mg/L A1203 colloidal suspensions were prepared by mixing 1.0 and 0.61111 A1203 particles with pure water. The membrane permeate flux at the same operating pressure was dependent on the pressure control type, increasing and decreasing, a hysteresis behavior which is interpreted as an irreversible compression of the cake deposited on the membrane, Cake resistance was measured as a function of the trans membrane pressure in the permeation. And flux decline caused by compaction was observed in the increasing pressure cycle. Permeate resistance and its rate of increase was higher in the decreasing pressure cycle than in the increasing pressure cycle because of the cake deposited on the membrane during the pressure increasing stage, For the membrane with 0.4511n pore size, the resistance increased slowly than that with 0.20/Ill. Permeate resistance of the suspension with 1 .0/all Al203 particles was less than that of the 0.6/In A1203 particles. Flux decline for the both cycles was governed by the cake filtration and the pressure reduction did not decrease the cake thickness. |
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| Key Words |
| Regenerated Cellulose, microfiltration, membrane, suspension, cyclic TMP |
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