Correlation equation for evaluating energy consumption and process performance of brackish water desalination by electrodialysis
Correlation equation for evaluating energy consumption and process performance of brackish water desalination by electrodialysis
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DOI：
10.1016/j.desal.2021.115089
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发表时间：
2021-08
期刊：
影响因子：
9.9
通讯作者：
Li Wang;Sohum K. Patel;M. Elimelech
中科院分区：
文献类型：
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作者：
Li Wang;Sohum K. Patel;M. Elimelech
电渗析（艾德）是一种电驱动的脱盐技术，其依赖于离子通过离子交换膜的选择性输送。虽然已经开发了几种方法来模拟和评估艾德的性能，机械离子传输模型，严格解决基本能斯特-普朗克方程，仍然是最可靠的和利用。然而，所涉及的运输现象的复杂性，防止这种模式的解析解，和数值解可以是令人望而却步的密集。在这里，我们使用的等效电路模拟推导出一个简单的相关方程，预测的高能量性能的艾德的苦咸水淡化。具体地，我们的相关方程预测了对于给定的生产率、一组脱盐参数（即，进料盐度、盐去除、水回收）和系统性质。的相关方程表现出鲁棒性在预测的比能耗在很宽的操作参数范围内，表现出良好的协议与能斯特-普朗克离子传输模型和文献报道的实验数据。此外，我们使用开发的相关方程，以显示的生产率上的比能耗的依赖关系，突出的热力学能量效率和脱盐率的艾德过程之间的权衡。总体而言，我们开发的相关方程提供了一个方便的替代计算密集型的机制模型的性能分析的艾德过程。
Electrodialysis (ED) is an electro-driven desalination technology that relies on the selective transport of ions through ion exchange membranes. Though several approaches have been developed to model and evaluate the performance of ED, mechanistic ion-transport models, which rigorously solve the fundamental Nernst-Planck equation, remain some of the most reliable and utilized. However, complexity of the involved transport phenomena prevents analytical solutions of such models, and numerical solutions can be prohibitively intensive. Here, we use an equivalent circuit analogue to derive a simple correlation equation that predicts the energetic performance of ED for brackish water desalination. Specifically, our correlation equation predicts the specific energy consumption of ED for a given productivity, set of desalination parameters (i.e., feed salinity, salt removal, water recovery), and system properties. The correlation equation demonstrates robustness in predicting the specific energy consumption across a wide range of operational parameters, showing excellent agreement with a Nernst-Planck ion-transport model and literature-reported experimental data. Furthermore, we use the developed correlation equation to show the dependence of the specific energy consumption on the productivity, highlighting the tradeoff between the thermodynamic energy efficiency and desalination rate of the ED process. Overall, our developed correlation equation provides a convenient alternative to computationally intensive mechanistic models for performance analysis of the ED process.