循环式电渗析器在高盐水体脱盐中的特性研究  

Research on the High-salt Water Desalination by Batch Recirculation Electrodialysis

作　　者：包申旭[1] 张一敏[1] 丁晓涛[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070

出　　处：《武汉理工大学学报》2010年第5期84-87,共4页Journal of Wuhan University of Technology

基　　金：国家博士后科学基金(20080440967);"十一五"国家科技支撑计划(2007BAB15B02)

摘　　要：利用某国产离子交换膜组装的循环式电渗析器对高盐水体(35 000 mg/L)进行了脱盐试验。在恒定电压条件下,浓、淡水箱中水体的盐度在脱盐开始时变化较快,随着浓、淡水盐度差的增加,脱盐速率逐渐降低。55 V时将盐度为35 000 mg/L的水体脱盐到1 500 mg/L时的平均脱盐速率为20.7 mg/(Ls),而25 V时的平均脱盐速率只有6.8 mg/(Ls)。在不同电压条件下,膜堆电流随时间先上升后降低最后达到一恒定最小值。单位脱盐能耗随膜堆电压的降低而降低,25 V时的单位能耗约为55 V时的1/2。随着隔室流量的上升单次脱盐率下降,当隔室流量从450 L/h上升到900 L/h时,单次脱盐率从14.3%下降到8.7%。The high-salt water（35 000 mg/L） desalination by batch recirculation electrodialysis was studied in this paper.At constant voltage conditions,salinities of water in concentrate and dilute tank monotonously increase and decrease with desalination time,respectively.The average desalination rate at 55 V is 20.7 mg/（Ls） when salinities in dilute solution change from 35 000 mg/L to 1 500 mg/L,while it is only 6.8 mg/（Ls） at 25 V.The stack currents increase at the begining of desalination,then decrease markedly with time and reach minimum at the end.The specific electrical energy consumption decreases with the decline of voltage and it at 25 V is about half of that at 55 V.The desalination rate of one cycle is negatively related to the flow rate of compartments,which decreases from 14.3% to 8.7% when volumetric flow rate increases from 450 L/h to 900 L/h.

关 键 词：循环式电渗析器 高盐废水 脱盐 离子交换膜 

分 类 号：X756[环境科学与工程—环境工程]