Nernst-Planck transport theory for (reverse) electrodialysis: III. Optimal membrane thickness for enhanced process performance

被引:70
作者
Tedesco, M. [1 ]
Hamelers, H. V. M. [1 ]
Biesheuvel, P. M. [1 ]
机构
[1] Wetsus, European Ctr Excellence Sustainable Water Technol, Oostergoweg 9, NL-8911 MA Leeuwarden, Netherlands
关键词
Ion exchange membrane; Membrane thickness; Nernst-Planck equation; Co-ion leakage; ION-EXCHANGE MEMBRANES; DESALINATION; DEIONIZATION; EFFICIENCY; PROSPECTS; MODEL;
D O I
10.1016/j.memsci.2018.07.090
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The effect of the thickness of ion exchange membranes has been investigated for electrodialysis (ED) and reverse electrodialysis (RED), both experimentally and through theoretical modeling. By developing a two-dimensional model based on Nernst-Planck theory, we theoretically find that reducing the membrane thickness benefits process performance only until a certain value, below which performance drops. For ED, an optimum thickness can be identified in the range of 10-20 mu m, while for RED the maximum power density is found for membranes that are three times as thick. Model calculations compare well with experimental data collected with a series of homogeneous membranes with the same chemical composition and a thickness in the range of 10-100 mu m. Our results show that the classical picture that membranes should be as thin as possible (as long as they remain pinhole-free and structurally stable) is insufficient, and must be replaced by a more accurate theoretical framework.
引用
收藏
页码:480 / 487
页数:8
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