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DOI : ,    Vol.20, No.1, 51 ~ 62, 2012
Title
Fouling Characteristics of Microfiltration Membrane by alumina Colloidal Suspension under a Cyclic Variation in TMP
남석태 Suk Tae Nam , 한명진 Myeong Jin Han
Abstract
This study investigated the fouling behavior of mirofiltration polyethylene (PE) membrane under the cyclic variations of transmembrane pressure(TMP). Al2O3 colloid suspensions was used as feed water. To examine the effect of operation variation on fouling, operating pressure was increased from 0.5kgt/cm2 to 2.0kgt/cm2 along with time elapses and then was reduced to 0.5 kgt/cm2 reversely. Cross flow microfiltration module with the capillary PE membrane of nominal pore size of 0.24 and 0.34um was used in the experiment. Fouling experiments were performed at 20℃ and at a constant flow rate of 12L/hr. 200 and 1000 ppm Al2O3 colloidal suspensions were prepared by mixing 1.0 and 0.6tm1 AI203 particles with pure water. Hysteresis was observed in the permeate flux over each pressure variation cycle. The permeate resistance and its rate of increase was higher in the backward pressure cylces than in the forward pressure cycles. At the initial period of filtration. fouling mechanism for the both cycles was governed by the cake filtration. The degree of fouling was higher in the backward pressure cycles compared with in the forward pressure cycles. and the ratio of cake filtration to the total fouling was higher than that of pore blocking. The ratio of component fouling was higher in the backward operation compared to in the forward cycles. Under the forward pressure cycle of 0.5kgtlcm2, the relative contributions of fouling mechanisms to the overall fouling were 15.8% for complete blocking. about 9.8% for cake filtration and 74.4% for cake filtration.
Key Words
membrane, microfiltration, colloidal suspension, fouling, cyclic
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