Membrane and Water Treatment

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Effects of ring number and baffled-ring distances on ultrafiltration in the tubular membrane inserted concentrically with a ring rod

  • Yeh, Ho-Ming (Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University) ;
  • Ho, Chii-Dong (Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University) ;
  • Li, Cha-Hsin (Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University)
  • Received : 2011.05.19
  • Accepted : 2011.01.06
  • Published : 2012.01.25
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Abstract

The permeate flux declination along an ultrafilter membrane is due mainly to the concentration-polarization resistance increment and the decline in transmembrane pressure. It was found in previous works that the concentration polarization resistance could be reduced in a ring-rod tubular membrane ultrafilter using the turbulent behavior. In the present study, the performance was further improved by properly and gradually decreasing the baffled-ring distance along the cross-flow channel coupled with properly adjusting the number of baffled rings. This theoretical analysis is based on the mass and momentum balances as well as the application of the resistance-in-series model. The correlation predictions are confirmed with the experimental results for dextran T500 aqueous solution ultrafiltration.

Keywords

References

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