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Membrane Water Treatment
  Volume 1, Number 2, April 2010 , pages 159-169

Dialysis in parallel-flow rectangular membrane modules with external reflux for improved performance
Ho-Ming Yeh, Tung-Wen Cheng and Kuan-Hung Chen

    The effect of external recycle on the performance of dialysis in countercurrent-flow rectangular membrane modules was investigated both theoretically and experimentally. Theoretical analysis of mass transfer in parallel-flow device with and without recycle is analogous to heat transfer in parallel-flow heat exchangers. Experiments were carried out with the use of a microporous membrane to dialyze urea aqueous solution by pure water. In contrast to a device with recycle, improvement in mass transfer is achievable if parallel-flow dialysis is operated in a device of same size with recycle which provides the increase of fluid velocity, resulting in reduction of mass-transfer resistance, especially for rather low feed volume rate.
Key Words
    dialysis; external recycle; parallel flow.
Ho-Ming Yeh, Tung-Wen Cheng and Kuan-Hung Chen; Department of Chemical and Materials Engineering, Tamkang University, Tamsui, Taipei 25137, Taiwan

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