基于活性炭纤维电极的无膜电去离子装置性能研究

Study on Performance of Membrane-Free Electrodeionization Device Based on Activated Carbon Fiber Electrodes

选用活性炭纤维作为电极材料,混合床树脂为离子交换剂,搭建一种无膜电去离子装置,探究树脂层高度、再生电压、再生流量对其性能的影响,并对装置的能耗、稳定性及电极的选择进行分析。结果表明,活性炭纤维电极应用于无膜电去离子装置提升了装置的吸附性能及再生性能,具有显著的优越性且电极性能稳定。无膜电去离子装置在树脂高度5 cm、再生电压250 V、再生体积流量45 m L/min的条件下运行较为适宜。550A-D113的混合离子交换树脂稳定性能良好,多个循环周期内未观察到树脂的颜色变化及阴阳树脂的分层现象,出水水质仍保持良好。经显微镜观察,虽长期使用后树脂表面形态有一定变化,但仍能满足装置运行使用需求。

Activated carbon fiber was used as electrode and mixed-bed resin was used as ion exchanger to construct membrane-free electrodeionization （MFEDI） device. The effects of resin layer height, regenerating voltage and regenerating flow rate on the performance were investigated, and the energy consumption, stability and electrodes selection of the device were analyzed. The results showed that, using activated carbon fiber electrode could improve the adsorption and regeneration ability of MFEDI devices, and the devices had prominent advantages and stable electrode performance. The optimal experiment conditions were as follows, the height of resin layers was 5 cm, the regenerating voltage was 250 V and volume flow rate in the regeneration step was 45 mL/min. 550A-D113 mixed-bed ion-exchange resins had good stability, the appearance of resin layers didn＇t change and effluent quality remained good during several operational cycles. Though the surface feature of resins had changed a little through microscopic examination, it could still meet the demand of operation.