A new static mixer concept for enhanced desalination performance in flow-electrode capacitive deionization (FCDI) systems
A new static mixer concept for enhanced desalination performance in flow-electrode capacitive deionization (FCDI) systems
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DOI：
10.1016/j.desal.2023.116887
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发表时间：
2023-08
期刊：
影响因子：
9.9
通讯作者：
Jonathan C. Ehring;A. Mizrak;Lutfi Agartan;Bilen Aküzüm;E. C. Kumbur
中科院分区：
文献类型：
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作者：
Jonathan C. Ehring;A. Mizrak;Lutfi Agartan;Bilen Aküzüm;E. C. Kumbur
导电性差和泵送能量成本高是限制流动电极电容去离子（FCDI）系统脱盐性能的两个主要挑战。在这项研究中，我们解决了这些限制，利用低碳负荷悬浮液（≤2重量%）与水一样的粘度在一个新的静态混合器的设计，称为膜辅助静态混合器（MASM）。MASM通过使活性材料和集电器之间的电荷传输距离最小化来改善浆料的电导率，因为离子交换膜直接压靠集电器表面（即，零间隙流场）。活性材料的连续混合通过经由来自蠕动泵的压力波动控制膜的位移来实现。在1、3、5、10、15和25 mL min-1的不同流速和0.5、1和2 wt%活性炭（AC）下，对三种MASM流场几何形状进行了参数研究。性能最佳的流动配置（2 wt% AC和15 mL min−1）显示出4.424 μg NaCl cm−2s− 1的高盐去除率，总能耗为98.95 kJ mol−1。
Poor electrical conductivity and high pumping energy cost are two major challenges that limit the desalination performance of flow-electrode capacitive deionization (FCDI) systems. In this study, we address these limitations by utilizing low carbon loading suspensions (≤2 wt%) with water-like viscosity in a novel static mixer design, referred to as a membrane-assisted static mixer (MASM). MASMs improved the electrical conductivity of the slurry by minimizing the charge transport distances between the active material and current collector as the ion-exchange membrane was compressed directly against the current collector surface (i.e., zero-gap flow field). Continuous mixing of the active material was achieved by controlling the displacement of the membrane via pressure fluctuations from the peristaltic pumps. A parametric study of three MASM flow field geometries was performed at varying flow rates of 1, 3, 5, 10, 15 and 25 mL min−1and 0.5, 1, and 2 wt% activated carbon (AC). The best-performing flow configuration (2 wt% AC and 15 mL min−1) showed a high salt removal rate of 4.424 μg NaCl cm−2s−1with a total energy consumption of 98.95 kJ mol−1.