Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (4): 857-862.doi: 10.1016/j.cjche.2018.08.007

• Separation Science and Engineering • Previous Articles     Next Articles

Separation of mixed salts (Cl-/SO42-) by ED based on monovalent anion selective membranes

Jiefeng Pan1,2, Wei Zhang1, Huimin Ruan1, Jiangnan Shen1,2, Congjie Gao1,2   

  1. 1 Center for Membrane Separation and Water Science & Technology, Ocean College, Zhejiang University of Technology, Hangzhou 310014, China;
    2 Huzhou Institute of Collaborative Innovation Center for Membrane Separation and Water Treatment, Zhejiang University of Technology, 1366 Hongfeng Road, Huzhou 313000, China
  • Received:2018-03-27 Revised:2018-07-12 Online:2019-04-28 Published:2019-06-14
  • Contact: Jiangnan Shen
  • Supported by:
    Supported by the National Key Research and Development Plan (Nos. 2017YFC0403700 and 2017YFD0400604).

Abstract: The industrial products or wastewater rich in the mixed salts (Cl-/SO42-) not only causes the environmental damage, but also induces waste of resource. In this study, an ED stack with monovalent selective AEMs and conventional CEMs was employed to separate the Cl-and SO42- from simulated wastewater. The effect of current density and mass fraction percentage was investigated in order to optimize the experimental conditions during ED process. It was found that at a concentration ratio between NaCl and Na2SO4 of 95/5 (wt%/wt%) and a current density of 40 mA·cm-2, a current efficiency of 72%, an energy consumption of 1.6 kW·h·kg-1 NaCl and a Cl-/SO42- concentration (67.5/3.5 g·L-1) were obtained. Hence, it is appropriate and effective to separate Cl-and SO42- by ED using the monovalent selective AEMs.

Key words: Electrodialysis, Separation of the mixed salts, Monovalent selective AEMs, Ion separation