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Membrane Water Treatment
  Volume 4, Number 3, July 2013 , pages 191-202
 open access

Dialysis with ultrafiltration through countercurrently parallel-flow membrane modules
Ho-Ming Yeh and Chien-Yu Chen

    The application of ultrafiltration operation to the dialysis in countercurrently parallel-flow rectangular membrane modules was investigated. The assumption of uniform ultrafiltration flux was made for operation with slight concentration polarization and declination of transmembrane pressure. Considerable improvement in mass transfer is achievable if the operation of ultrafiltration is applied, especially for the system with low mass transfer coefficient. The enhancement in separation efficiency is significantly increased with increasing ultrafiltration flux, as well as with increasing the volumetric flow rates. Furthermore, increasing the volumetric flow rate in retentate phase is more beneficial to mass transfer than increasing in dialysate phase.
Key Words
    mass transfer; dialysis; ultrafiltration; countercurrently parallel-flow; rectangular membrane module
Ho-Ming Yeh and Chien-Yu Chen: Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, Taipei County, 251, Taiwan

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