垃圾填埋场防渗浆材对重金属污染物阻滞规律的实验研究

Experiment research of retardation rule of antiseepage slurry from waste landfill sites to heavy metal contamination

基于膨润土—粉煤灰—水泥(BFC)浆材和柔壁渗透仪,采用人工配制的重金属离子溶液对不同高度浆材结石体进行了渗滤试验,试验证明:由于渗滤沉积作用和吸附滞留作用,浆材结石体对Hg、As、Pb、Cr、Cd等重金属污染物的95%阻滞在开始渗滤的30 mm范围内,而且随着试样高度增加,对各种污染物的阻滞率基本呈现增大的趋势,并有一定的规律可循。

An infiltration test was conducted on slurry concretion samples of different height by using heavy metal ions solution based on self-developed bentonite-fly ash-cement（BFC）slurry and flexible wall permeameter.Test proves that as a result of the infiltration deposition and adsorption residence performance,95% retardation by slurry concretion happens in 30mm of initial infiltration to heavy metal contamination（Hg,As,Pb,Cr,Cd etc.）.Moreover,blocking rate for all contaminations presents an increasing trend along with the increase of the height of slurry concretion samples,which has a certain rule to follow.