可渗透反应墙过滤区堵塞情况研究

Study on Clogging in Filtration Area of Permeable Reactive Barrier

采用柱体过滤实验,模拟可渗透反应墙原位处理酸性矿井废水过滤区堵塞的过程。通过改变过滤材料配比、进水悬浊液浓度、水力停留时间,测定出水悬浊液浓度及渗透速率的变化,系统研究了这3个变量对过滤区堵塞的影响。结果表明:滤料配比石英砂∶陶粒为1∶0和2∶1时,孔隙率下降最小,分别下降了26.8%、23.5%;综合分析出水处理效果及柱体孔隙率的下降规律,确定进水浓度为150 mg/L、水力停留时间为12 h为最佳实验条件。

Filtration exPeriments in column to simulate the clogging in filtration area in in-situ treating acid mine drainage using Permeable reactive barrier（ PRB）were ProPosed. The effects of Filter mate-rial ratio,the susPension concentration in influent and the hydraulic retention time（ HRT）on the clogging in filtration area were investigated by measuring susPension liquid and infiltration rate of ef-fluent. The results indicates the Porosities decreases by 26. 8% and 23. 5% resPectively with the filter material quartz sand and ceramsite ratio of 1：0 and 2：1 and considering the efficiency and descending law of Porosity in column and the influent of 150 mg/L and HRT of 12 h are oPtimal in the Present ex-Periment.