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pH Dependence of Phosphorus Speciation and Transport in Flow-Electrode Capacitive Deionization

机译：磷形状化的pH依赖性和流动电极电容去离子的运输

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摘要

Electrochemical processes such as capacitive deionization have shown great promise for salt removal and nutrient recovery, but their effectiveness on phosphate removal was lower than other charged ions. This study hypothesized that the speciation and transport behaviors of phosphate ions are highly influenced by electrolyte pH, and it used experimental and modeling approaches to elucidate such impacts in flow-electrode capacitive deionization (FCDI) cells. Phosphate removal was investigated in either constant current (CC) or constant voltage (CV) charging mode with pH ranged from 5 to 9 in the feed solution. Results showed that the average P removal rate increased from 20.8 (CC mode) and 16.8 mg/min (CV mode) at pH 9 to 38.3 (CC mode) and 34.3 mg/min (CV mode) at pH 5 (84-104% in improvement), respectively. Correspondingly, the energy consumption reduced from 1.04 kWh/kg P at pH 9 to 0.59 kWh/kg P at pH 5 (42.9-56.1% in saving). Such benefits were attributed to the shift in dominant P-species from HPO_4~(2-) to H_2PO_4~-. Conversely, high-electrolyte pH (pH = ll) for flow-electrode led to ～74.8% higher phosphate recovery during discharge compared with pH 5, which was associated with the higher distribution of phosphate ions in the electrolyte versus on the flow-electrodes due to surface charge change. These results improved our understanding in ion distribution and migration and indicate that solution pH is critical for operating FCDI reactors. It shed lights on the best practices on electrochemical phosphate removal and recovery.
机译：电化学灭菌等电化学方法表现出盐去除和营养回收的许多希望，但它们对磷酸盐去除的有效性低于其他带电离子。这项研究假设磷酸盐离子的物种和运输行为受电解质pH的高度影响，并且使用实验和建模方法来阐明流动电极电容去离子（FCDI）细胞的这种影响。在恒定电流（CC）或恒定电压（CV）充电模式中研究了磷酸盐去除，PH在进料溶液中的5至9中。结果表明，在pH 9至38.3（CC模式）和34.3mg / min（CV模式）下，平均P去除速率从20.8（CC模式）和16.8mg / min（CV模式）增加到pH5的34.3mg / min（CV模式）（84-104％）在改进）分别。相应地，在pH5至0.59kWh / kg p的pH 5下的1.04 kWh / kg p减少了从1.04 kwh / kg p的能量消耗（节省42.9-56.1％）。这种益处归因于HPO_4〜（2-）到HPO_4〜（2-）的显性P型转变为HPO_4PO_4〜 - 。相反，与pH 5相比，流动电极的高电解质pH（pH = L1）在放电期间磷酸盐率高〜74.8％，这与电解质与由于所致的电解质相反的磷离子的较高分布相关表面电荷变化。这些结果改善了我们在离子分布和迁移中的理解，并表明溶液pH对于操作FCDI反应器至关重要。它在电化学磷酸盐去除和恢复的最佳实践中阐明。

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  • 来源
    《Environmental Science & Technology》 |2020年第14期|9116-9123|共8页
  • 作者

    Yanhong Bian; Xi Chen; Zhiyong Jason Ren;

  • 作者单位

    Department of Civil and Environmental Engineering and the Andlinger Center for Energy and the Environment Princeton University Princeton New Jersey 08544 United States;

    Department of Civil and Environmental Engineering and the Andlinger Center for Energy and the Environment Princeton University Princeton New Jersey 08544 United States;

    Department of Civil and Environmental Engineering and the Andlinger Center for Energy and the Environment Princeton University Princeton New Jersey 08544 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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