流动性电极电容去离子技术的脱盐性能研究

摘要

为改进传统静态电容去离子技术(CDI)的脱盐性能,组装了流动性电极电容去离子系统(FCDI),并分别以活性炭80(AC80)和纳米洋葱炭(CNOs)制备电极浆液,考察在不同电压、盐溶液流速、盐浓度等条件下FCDI的脱盐效果.实验结果表明,AC80制备的电极浆液脱盐性能优于CNOs,FCDI的脱盐率随电压的增加而增大,随盐溶液流速的增加而减小,当以AC80制备电极浆液,电压为1.4 V,盐溶液进水质量浓度为100 mg/L,流速为2.5 mL/min,进料室盐溶液流速与阴阳电极室中电极浆料流速比为1∶2∶2时,FCDI的脱盐率达70.38%.在最佳运行条件下构建二级串联FCDI模组,其对100 mg/L盐溶液的脱盐率达82.63%,随着盐浓度的增大,二级串联FCDI模组的脱盐率随之降低,但脱盐速率及比吸附量逐渐增加,导致脱盐比能耗降低.%In order to improve the electro-adsorption capacity of the traditional static capacitive deionization method,the fluid-electrode capacitive deionization (FCDI) system was assembled.The AC80 and nano-onion charcoal (CNOs) was applied to prepare fluid electrode slurry respectively,and the effects of different operating parameters such as voltage,slution flow rate and salinity on the desalting efficiency of FCDI were researched.The results showed that the desalination performance of AC80 fluid electrode slurry was superior to that of CNOs fluid electrode slurry.The desalination rate of FCDI was increased with the increasing voltage,while,the desalination rate decreased with the increasing flow velocity of saline solution.When the FCDI operated with AC80 fluid electrode slurry,the voltage was 1.4 V,the flow velocity of saline solution was 2.5 mL/min,influent concentration was 100 mg/L,the flow rate ratio of salt solution in the feed chamber to electrode slurry in the cathode and anode chamber was 1∶2∶2,desalination rate could reached to 70.38%.Two-stage FCDI was established and operated uner the optimal condition,the desalination rate increased to 82.63% for 100 mg/L saline solution.With the increase of salt concentration,the desalination rate of two-stage FCDI was decreased,while the specific adsorption capacity was increased,which resulting in lower specific energy consumption for two-stage FCDI.