隔离材料对复合污染物的运移阻滞效应研究

Study on the migration blocking effect of isolation barrier on composite pollutants

为了解复合污染物在隔离屏障中的运移情况,以膨润土、硅藻土、粉煤灰为隔离材料,通过柱模拟试验得到扩散曲线,分析得出:单一污染条件下,苯酚的扩散速度大于铅的扩散速度。随着污染物浓度增加,扩散系数也会增大。膨润土对铅的吸附效果最佳,硅藻土对苯酚的吸附效果最佳;复合污染条件下,加入硅藻土可明显降低苯酚的扩散系数,加入粉煤灰可明显降低铅的扩散系数;对比单一污染物,复合污染条件下污染物的扩散系数增大,对铅的扩散影响更明显。

In order to understand the migration of composite pollutants in the isolation barrier,bentonite,diatomite and fly ash were used as isolation materials to obtain the diffusion curves through the column simulation test.The analysis showed that the diffusion velocity of phenol was higher than that of lead under the single pollutant condition.The diffusion coefficient increases with the increase of pollutant concentration.Bentonite has the best adsorption effect on lead and diatomite has the best adsorption effect on phenol.Under the combined pollution condition,adding diatomite can obviously reduce the diffusion coefficient of phenol,and adding fly ash can obviously reduce the diffusion coefficient of lead.Compared with that with a single pollutant,the diffusion coefficient of composite pollutants increases,and the diffusion effect of lead is more obvious.The findings are of great significance to practical applications.