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Membrane Water Treatment
  Volume 3, Number 1, January 2012 , pages 63-76

Continuous ion-exchange membrane electrodialysis of mother liquid discharged from a salt-manufacturing plant and transport of Cl- ions and SO4 2- ions
Yoshinobu Tanaka, Hazime Uchino and Masayoshi Murakami

    The permeate flux declination along an ultrafilter membrane is due mainly to the concentrationpolarization 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.
Key Words
    ultrafiltration; tubular membrane; ring-rod insert; baffled-ring distance; proper ring number
Yoshinobu Tanaka : IEM Research. 1-46-3 Kamiya, Ushiki-shi, Ibaraki 300-1216, Japan
Hazime Uchino : Tokai University, College of Marine Science and Technology, 3-20-1 Orido, Shimizu-ku, Shizuoka-shi,
Shizuoka 424-8610, Japan
Masayoshi Murakami : Japan Fine Salt Co. Ltd., 3-3-3 Yako, Kawasaki-ku, Kawasaki-shi, Kanagawa 210-0863, Japan

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