운전압력의 순환변화에 따른 알루미나 현탁액의 정밀여과 오염특성 (Fouling Characteristics of Microfiltration Membrane by Alumina Colloidal Suspension under a Cyclic Variation in TMP)

서지정보

· 발행기관 : 한국수처리학회
· 수록지 정보 : 한국수처리학회지 / 20권 / 1호 / 51 ~ 61페이지
· 저자명 : 남석태, 한명진

초록

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 0.5 kgf/cm2 to 2.0 kgf/cm2 along with time elapses and then was reduced to 0.5 kgf/cm2 reversely. Cross flow microfiltration module with the capillary PE membrane of nominal pore size of 0.24 and 0.34 ㎛ was used in the experiment. Fouling experiments were performed at 20℃ and at a constant flow rate of 12 L/hr. 200 and 1000 ppm Al2O3 colloidal suspensions were prepared by mixing 1.0 and 0.6 ㎛ Al2O3 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 0.5kgf/cm2, 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.

영어초록

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 0.5 kgf/cm2 to 2.0 kgf/cm2 along with time elapses and then was reduced to 0.5 kgf/cm2 reversely. Cross flow microfiltration module with the capillary PE membrane of nominal pore size of 0.24 and 0.34 ㎛ was used in the experiment. Fouling experiments were performed at 20℃ and at a constant flow rate of 12 L/hr. 200 and 1000 ppm Al2O3 colloidal suspensions were prepared by mixing 1.0 and 0.6 ㎛ Al2O3 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 0.5kgf/cm2, 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.

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