Ion Exchange Membranes for Water Treatment

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Applications".

Deadline for manuscript submissions: closed (15 May 2019)

Special Issue Editor


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Guest Editor
Ben-Gurion University of the Negev, Zuckerberg Institute for Water Research, Sede Boker Campus, Israel
Interests: electrically driven membrane separations, electrodialysis, capacitive deionization, ion exchange membranes, transport phenomena in pressure driven membranes for water treatment, fouling and scaling mechanisms of membranes, membrane characterization by electrochemical methods

Special Issue Information

Dear Colleagues,

Ion exchange membranes (IEMs) were first used in 1890 by Maigrot and Sabates in their pioneering study on the electrocally driven demineralization of sugar syrup. During the first half of the 20th century, this was followed by the first modeling of these membranes by Michaelis, who studied the properties of collodion membranes, the develpoment of the Donnan exclusion theory, the preparation of synthetic polymeric ion selective membranes, and the introduction of the electrodialysis (ED) stack with multiple cell pairs. Since then, the use of IEMs was extended to many applications including water treatment (desalination, separation between charged and non-charged species, selective removal of ions and more) by ED and membrane capacitive deionization (MCDI), energy generation devices such as Reverse ED, fuel cells, and different kinds of batteries. They are widely used today in the chemical industry for, e.g., metathesis, acid-base production (with bipolar IEMs), and ultrapure water preparation (by electrodeionization), and in the chlor-alkali industry. Selective and specially designed IEMs are used in different sensing devices.

This Special Issue will focus on recent developments in the field of ion exchange membranes and new insights gained in our understanding of their physico-chemical and transport properties. In particular, we seek contributions associated with water treatment using ion exchange membranes, according to the themes listed below.

  • bipolar membranes
  • characterization
  • chemical and physical stability
  • Donnan dialysis
  • diffusion dialysis
  • electrodeionization
  • electrodialysis
  • membrane capacitive deionization
  • modeling
  • new polymeric matrices for ion exchange membranes
  • organic/inorganic composite ion exchange membranes
  • scaling, fouling, and biofouling of ion exchange membranes
  • shock electrodialysis
  • selective/functionalized ion exchange membranes
  • transport phenomena

Prof. Dr. Yoram Oren
Guest Editor

Manuscript Submission Information

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Published Papers (1 paper)

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Research

19 pages, 5186 KiB  
Article
Numerical Estimation of Limiting Current Density by Focusing on Mass Transfer within Porous Spacers in an Electro-Dialysis
by Yoshihiko Sano, Kosuke Fukagawa and Fujio Kuwahara
Membranes 2019, 9(7), 75; https://doi.org/10.3390/membranes9070075 - 28 Jun 2019
Cited by 3 | Viewed by 3040
Abstract
Estimating and increasing limiting current density (LCD) levels is of fundamental importance for the development of electrodialysis (ED) systems, and it is becoming clear that the use of porous spacers can significantly increase such LCD levels. In this study, a three-dimensional numerical simulation [...] Read more.
Estimating and increasing limiting current density (LCD) levels is of fundamental importance for the development of electrodialysis (ED) systems, and it is becoming clear that the use of porous spacers can significantly increase such LCD levels. In this study, a three-dimensional numerical simulation was proposed for evaluating the mass transfer within a porous spacer unit cell and for estimating LCD levels. It was found that our proposed method is effective for estimating the minimum value of an LCD, which is a significant factor related to the safe operation of ED systems. Furthermore, it was found that increasing the minimum effective Sherwood number provides a key to increasing LCD levels. Porous spacer design guidelines were proposed based on the numerical simulation results, after which a new spacer was introduced, designed according to those guidelines. It was found that flow disturbances on the membrane caused by porous spacer structures can lead to increases in effective Sherwood numbers and that LCD levels could be increased by eliminating the flow stagnation behind the structures on the membrane. The LCD of our new spacer was found to be higher than that of the spacers with the highest LCD levels in use at present. Therefore, we can conclude that the proposed design guidelines are effective for increasing LCD levels. Full article
(This article belongs to the Special Issue Ion Exchange Membranes for Water Treatment)
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