Abstract This paper focuses on electrodialysis (ED) desalination modeling of standard seawater and brackish water as a multi-component and equivalent NaCl solutions. Experimentally validated two-dimensional models are developed based on ions separation through a cell pair of ED. Nernst-Planck equation is integrated with Navier-Stokes equations to carry out modeling using the COMSOL program. The results show that the multi-component model is important for the selected brackish water separation, while it is not significant for the investigated seawater. NaCl model predicts a little higher (~1%) current density than the standard multi-component seawater while that is lower (~14%) for a multi-component brackish water, indicating that the cell pair resistant of multi-component brackish water is different from that of equivalent NaCl solution. Ionic concentration and flux (total, migrative, and diffusive) profiles for the standard seawater (Na+, Cl−, Mg2+, SO42−, K+, Ca2+, F−, Br−, and HCO3−), a multi-component brackish water (Na+, Cl−, Mg2+, SO42−, K+, Ca2+, F−, NO3−, and HCO3−), and equivalent NaCl solutions are represented and compared. This study recommends that the NaCl model could be used for the seawater ED model, while the multi-component ED model is preferred for brackish water. Since ED systems are highly recommended for brackish water, the multi-component ED-model is needed.

中文翻译：

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用多组分盐水模拟电渗析脱盐的意义

摘要 本文重点研究标准海水和微咸水作为多组分等价 NaCl 溶液的电渗析 (ED) 脱盐建模。实验验证的二维模型是基于通过 ED 细胞对进行的离子分离而开发的。Nernst-Planck 方程与 Navier-Stokes 方程相结合，使用 COMSOL 程序进行建模。结果表明，多组分模型对选定的苦咸水分离很重要，而对研究的海水不显着。NaCl 模型预测的电流密度比标准多组分海水略高 (~1%)，而多组分咸水则较低 (~14%)，表明多组分咸水的细胞对电阻为与等量的 NaCl 溶液不同。标准海水（Na+、Cl−、Mg2+、SO42−、K+、Ca2+、F−、Br− 和 HCO3−）、多组分微咸水（ Na+、Cl-、Mg2+、SO42-、K+、Ca2+、F-、NO3- 和 HCO3-) 和等效的 NaCl 溶液被表示和比较。本研究建议海水 ED 模型可使用 NaCl 模型，而微咸水优选多组分 ED 模型。由于 ED 系统强烈推荐用于微咸水，因此需要多组分 ED 模型。本研究建议海水 ED 模型可使用 NaCl 模型，而微咸水优选多组分 ED 模型。由于 ED 系统强烈推荐用于微咸水，因此需要多组分 ED 模型。本研究建议海水 ED 模型可使用 NaCl 模型，而微咸水优选多组分 ED 模型。由于 ED 系统强烈推荐用于微咸水，因此需要多组分 ED 模型。