Influence of Feed-Electrode Concentration Differences in Flow-Electrode Systems for Capacitive Deionization
Influence of Feed-Electrode Concentration Differences in Flow-Electrode Systems for Capacitive Deionization
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DOI：
10.1021/acs.iecr.8b01626
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发表时间：
2018-06
影响因子：
4.2
通讯作者：
Daniel Moreno;M. Hatzell
中科院分区：
文献类型：
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作者：
Daniel Moreno;M. Hatzell
归因于流动电极电容去离子系统的常见性能指标可以根据操作模式和初始系统条件而显著变化。通过改变流动电解质离子强度，诸如平均盐吸附率和能量消耗的性能值可以变化多达51%和55%。这种周期与周期之间的变化部分是由于电导率（欧姆）的变化，但也是由于竞争性运输过程的引入。扩散输运可以提高或降低脱盐和能量回收的速度，从而在报告的数值中产生更大程度的误差。在这里，我们提出了一个无量纲比比较扩散和电迁移为基础的运输来衡量性能稳定性。当进料离子强度与流动电极离子强度不匹配时，不稳定的系统性能最突出。在这种情况下，扩散与电迁移传输的比率达到最大值。Conversel...
The common performance metrics ascribed to flow electrode capacitive deionization systems can vary significantly depending on the mode of operation and initial system conditions. Through varying the flow electrolyte ionic strength, performance values such as average salt adsorption rate and energy consumption can vary by as much as 51 and 55%. This variability from cycle to cycle is in part due to changes in the electrical conductivity (ohmic) but is also due to the introduction of competing transport processes. Diffusive transport can enhance or diminish the rate of desalination and energy recovery, creating a larger degree of error in reported values. Here, we propose a dimensionless ratio comparing diffusion and electromigration-based transport to measure performance stability. Unstable system performance is most prominent when the feed ionic strength does not match the flow electrode ionic strength. In this scenario, the ratio of the diffusion to electromigration transport reached a maximum. Conversel...