SA Water Centre for Water Management and Reuse, University of South Australia, Adelaide, SA 5095, Australia.
J Hazard Mater. 2012 Apr 30;213-214:491-7. doi: 10.1016/j.jhazmat.2012.02.036. Epub 2012 Feb 21.
Capacitive deionisation (CDI) has many advantages over other desalination technologies due to its low energy consumption, less environmental pollution and low fouling potential. The objectives of this study are to investigate the effect of operational conditions on the CDI electrosorption efficiency and energy consumption, to identify ion selectivity in multi-ionic solutions and to probe the effect of dissolved reactive silica on the treatment efficiency. A series of laboratory scale experiments were conducted using a CDI unit with activated carbon electrodes. The electrosorption removal efficiency was inversely related to solution temperature, initial total dissolved salts (TDS) concentration and the applied flow rate. CDI energy consumption (kWh/m(3)) is directly related to the TDS concentration and inversely related to the flow rate. The kinetics analysis indicated that the electrosorption followed pseudo-first-order kinetics model. Ion selectivity on activated carbon electrodes followed the order of Fe(3+)>Ca(2+)>Mg(2+)>Na(+) for cations and SO(4)(2-)>Br(-)>Cl(-)>F(-)>NO(3)(-) for anions. It was found that the dissolved silica was not removed by CDI; no silica fouling was found. The deterioration of activated carbon electrodes was not observed at any time during experiment.
电容去离子（CDI）因其低能耗、低环境污染和低结垢潜力而优于其他脱盐技术。本研究的目的是研究操作条件对 CDI 电吸附效率和能耗的影响，确定多离子溶液中的离子选择性，并探讨溶解反应性硅对处理效率的影响。使用带有活性炭电极的 CDI 装置进行了一系列实验室规模的实验。电吸附去除效率与溶液温度、初始总溶解盐（TDS）浓度和施加的流速成反比。CDI 能耗（kWh/m3）与 TDS 浓度成正比，与流速成反比。动力学分析表明，电吸附遵循准一级动力学模型。活性炭电极上的离子选择性顺序为阳离子 Fe(3+)>Ca(2+)>Mg(2+)>Na(+)，阴离子 SO(4)(2-)>Br(-)>Cl(-)>F(-)>NO(3)(-)。发现 CDI 不能去除溶解的硅；没有发现硅结垢。在实验过程中的任何时候都没有观察到活性炭电极的恶化。
