Fouling of Ion Exchange Membranes and Their Fouling Mitigation

이온교환막의 막오염 및 오염저감

  • 문승현 (광주과학기술원 환경공학과) ;
  • 이홍주 (광주과학기술원 환경공학과)
  • Published : 2002.06.01

Abstract

fouling phenomena of ion exchange membranes were reviewed for improved design and operation of electodialysis. The membrane fouling index for electrodialysis (EDMFI) was defined for the quantitative analysis of fouling potential as an analogy to the pressure-driven membrane process. fouling phenomena were compared in the electrodialysis experiments with inorganic foulant (silica sol) and organic foulants (humate and bovine serum albumin (BSA)), and their fouling potentials were analyzed using the fouling index. The comparison showed that the EDMFI could be used as a quantitative measure of the fouling tendency in electrodialysis processes. As a novel fouling mitigation method, square wave power was reported to be effective in electrodialysis with organic foulants. The square wave powers having the pulsed electric field enabled to reduce the membrane fouling significantly at an optimal frequency.

본 총설에서는 전기투석 공정의 운전과 설계 능력 향상을 위해 이온교환막의 막오염현상에 관한 연구를 조사하였다. 이온교환막의 막오염현상을 정량적으로 평가하기 위해 압력차를 구동력으로 하는 막공정의 막오염지수와 유사한 전기투석 막오염지수(EDMFI)를 정의하였다. 막오염현상은 무기오염원인 실리카졸과 유기 오염원인 휴믹산과 BSA를 함유한 전기 투석 실험 결과를 비교하여 연구되었다. 이 비교에서 EDMFI는 전기투석 공정의 막오염경향을 정량적인 척도로 유용하게 이용될 수 있음을 보여주었다. 새로운 오염저감 기술로 사각파 전원이 유효함이 유기 오염물을 포함한 전기투석 실험결과에서 보고되었다. 이펄스 형태의 사각파 전원은 최적주파수에서 막오염현상을 현저하게 감소시킬 수 있었다.

Keywords

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