Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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A Study on Process Performances of Continuous Electrodeionization with a Bipolar Membrane for Water Softening and Electric Regeneration

바이폴라막을 이용한 연수용 전기탈이온의 공정 효율 및 전기적 재생에 관한 연구

  • Moon, Seung-Hyeon (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST)) ;
  • Hong, Min-Kyoung (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST)) ;
  • Han, Sang-Don (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST)) ;
  • Lee, Hong-Joo (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology(GIST))
  • 문승현 (광주과학기술원 환경공학과) ;
  • 홍민경 (광주과학기술원 환경공학과) ;
  • 한상돈 (광주과학기술원 환경공학과) ;
  • 이홍주 (광주과학기술원 환경공학과)
  • Published : 2007.09.30
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Abstract

CEDI-BPM(Continuous Electrodeionization-Bipolar Membrane) has advantages due to high ion permselectivity through ion exchange membranes and the production of $H^+$ and $OH^-$ ions on the bipolar membrane surfaces for regeneration of ion exchange resin during electrodeionization operation. In this study, hardness materials were removed by the CEDI-BPM without scale formation and the ion exchange resins were electrically regenerated during the operation. The adsorption characteristic of ion exchange resin surface, the influence of flow rate on the hardness removal and electric regeneration were investigated in the study. The removal efficiency of Ca was higher than that of Mg in the CEDI-BPM, which was related to the high adsorption capacity of Ca on the cation exchange resin. With increasing flow rate, the flux of Ca and Mg was enhanced by the permselectivity of a cation exchange membrane. In the electric regeneration of CEDI-BPM, it was shown that the regeneration efficiency was higher with a lower regeneration potential applied between cathode and anode.

바이폴라막을 이 용한 전기탈이온(Continuous Electrodeionization-Bipolar Membrane(CEDI-BPM))공정 은 이온교환막의 이온 선택적 투과를 통한 제거의 효율을 높이며, 바이폴라막에서 생성된 수소이온과 수산화이온이 이온교환수지를 전기적으로 재생하여 재생효율을 높일 수 있는 장점을 지니고 있다. 본 연구에서는 CEDI-BPM을 이용하여 경도물질을 제거하고 전기적 재생을 수행하였다. 이를 위하여 이온교환수지의 흡착 특성 및 유량의 변화에 따른 경도제거효율의 영향과 전기적 재생방법을 이용한 재생효율을 조사하였다. CEDI-BPM에서 Ca의 제거율이 Mg보다 높은 값을 보여주었는데, 이는 흡착실험에서 Ca의 높은 흡착능력과 관계가 있음을 보여주었다. 유량이 증가함에 따라 Ca과 Mg의 플럭스는 증가하는 경향을 보이는데, 양이온 교환막의 선택 투과가 경도물질의 제거에 더 큰 영향을 미치고 있음을 알 수 있다. CEDI-BPM의 전기적인 재생 실험결과 재생 전압을 낮게 유지할수록 높은 경도물질 제거효율 및 높은 플럭스를 보여 전기적 재생에 효율적으로 사용할 수 있음을 보여주었다.

Keywords

References

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