电渗析技术在锰污染废水治理中的应用研究

Application of Electrodialysis Technology in Treatment of Mn Polluted Wastewater

文章设计并建造了一个中试规模的电渗析(ED)系统来处理被Mn污染的地下水,并研究了极限电流密度、线流速、施加电压和膜面积对ED系统处理效果的影响。考虑到所研究的合成地下水含盐量较低,需改进ED系统以提高电流利用率,并使ED系统可在低电压下用于饮用水生产。基于对极限电流密度的评估,线流速从0.74 cm/s增加到11 cm/s。含有14对离子交换膜的ED系统,运行60 min后所得稀溶液水质满足饮用水水质的标准。将离子交换膜增加到21对和42对时,对降低稀释液的电导率非常有效。通过比能耗评估了ED系统的运行成本,为1.065~1.2 kWh/m^(3)。

In this paper, a pilot-scale electrodialysis(ED) system was designed and built to treat groundwater polluted by Mn. The effects of the limiting current density, line flow rate, applied voltage and membrane area onthe treatment effect of ED system were studied. Considering the low salinity of the studied synthetic groundwater, the ED system needs to be improved to improve the current utilization and make the ED system available for drinking water production at low voltage. Based on the evaluation of the limiting current density, the linear flow velocity increased from 0.74 cm/s to 11 cm/s. The ED system containing 14 pairs of ion-exchange membranes, after running for 60 min, the water quality of the dilute solution obtained meets the drinking water quality standard. Increasing the ion exchange membrane to 21 and 42 pairs was very effective in reducing the conductivity of the diluent. The operating cost of the ED system was estimated by specific energy consumption and was 1.065~1.2 kWh/m^(3).