循环式电渗析器在高盐水体脱盐中的特性研究

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%。

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

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 w...