Numerical Analysis of Concentration Polarization for Spacer Configuration in Plate Type Membrane Module

평판형 분리막 모듈 내 스페이서 형태에 따른 농도분극에 관한 수치해석

  • Shin, Ho Chul (Department of Chemical Engineering, Seoul National Univ. of Technology & Science) ;
  • Chung, Kun Yong (Department of Chemical Engineering, Seoul National Univ. of Technology & Science)
  • 신호철 (서울과학기술대학교 화학공학과) ;
  • 정건용 (서울과학기술대학교 화학공학과)
  • Received : 2011.09.22
  • Accepted : 2011.10.26
  • Published : 2011.12.10

Abstract

As the spacer in the membrane module provide the channel space to flow the feed solution smoothly and induce the flow turbulence, it could help to reduce both the concentration polarization and to take the long-term operation of membrane modules with high permeate flux by mixing the accumulated contaminants on the membrane surface into the bulk solution. In this study, the concentration distribution in membrane module with respect to the spacers which have the cross-sectional shapes of circle, cross, diamond and hexagon, the angles of spacer configuration, solute rejection and permeate flux were interpreted and optimized numerically using the "COMSOL Multiphysics" software. The concentration on the membrane surface was kept the lowest level for the cross-shape among the above four types of spacers. Also the 30 degree spacer configuration was showed as the most efficient case. The concentrations on the membrane surface at the module outlet for without spacer and the cross shape with the 30 degree spacer configuration were 2.09 and 1.29 times higher than those at inlet, respectively. The reduction effect of concentration polarization increased rapidly as the permeate flux increased.

Keywords

plate membrane module;COMSOL;spacers;concentration polarization;permeate flux

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