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Membrane Water Treatment   Volume 2, Number 2, April 2011, pages 75-89
DOI: https://doi.org/10.12989/mwt.2011.2.2.075
 
Dialysis in double-pass cross-flow rectangular membrane modules with external recycle for improved performance
Ho-Ming Yeh

 
Abstract     [Buy Article]
    The predicting equations for mass transfer rate in cross-flow rectangular dialyzers with double flow and recycle, have been derived by mass balances. The recycling operation has two conflicting effects. One is the desirable effect of the increase in fluid velocity, resulting in an increased mass transfer coefficient. The other is the undesirable effect of the reduction in concentration difference due to remixing, resulting in decreased mass-transfer driving force. In contrast a single-pass device without recycling, considerable improvement in mass transfer is achieved if the cross-flow rectangular dialyzer of same size is operated with double pass and external recycling. It is concluded that recycle can enhance mass transfer, especially for larger reflux ratio.
 
Key Words
    dialysis; external recycle; cross-flow; rectangular module; performance improved
 
Address
Energy and Opto-Electronic Materials Research Center,Department of Chemical and Materials Engineering,
Tamkang University Tamsui, Taipei County, Taiwan 251
 

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