粉煤灰对垃圾填埋场黄土垫层的改性试验

通过击实、渗透试验得到粉煤灰改性-黄土的最佳配比为10%。对压实黄土和压实粉煤灰改性-黄土,分别用清水和渗滤液进行室内渗透试验,结果表明:渗滤液在压实粉煤灰改性黄土中的渗透系数≤1.0×10-7cm/s,在压实黄土中的渗透系数≤1.0×10-5cm/s,前者可作为填埋场防渗垫层,后者可作为填埋场防渗保护垫层。对COD、NH3-N的去除效果前者优于后者。

A TEST OF FLY-ASH MODIFIED LOESS OF LANDFILL LINER MATERIAL

It has been found that the better fly-ash modified loess liner could be achieved while fly-ash filling rate is 10% by the compacting and permeability tests. Two laboratory permeability tests have been done for tap water and leachate infiltration, respectively. One was for the compacted loess, and the other for the compacted fly-ash modified loess. The findings indicated that the permeability of leachate in the compacted fly-ash modified loess could be less than 1.0×10~(-7)cm/s, and also less than 1.0×10; 5 cm/s when in compacted loess. The former can be used as the landfill liner,and the latter the landfill protective liner. Furthermore, the removal efficiency of COD and NH_3-N of the former was better than that of the latter.