生活垃圾填埋场垂直防渗浆材的试验研究

Test and research of vertical anti-seepage slurry for domestic waste landfill site

为研制出一种低渗透系数并对污染物有一定吸附阻滞作用的浆材,用于城市生活垃圾填埋场渗滤液防渗工程。通过正交试验优选出了以膨润土为主的浆材配合比：膨润土20%~30%、水泥15%~25%、粉煤灰20%~25%、纯碱1.0%~1.4%、稀释剂FCLS加量0.35%~0.75%,余之为水。该浆材结石率大于99.6%,固结体28 d渗透系数小于0.8×10-7 cm/s,无侧限抗压强度小于2.0 MPa,浆材固结体对CODCr、BOD5、铵态氮和磷的吸附阻滞率达到了82%以上,对Hg、Pb等重金属离子阻滞率在99%以上。所研制的浆材固结体渗透系数低,对渗滤液中污染物的吸附阻滞作用好,抗压强度和脆性抵,塑性和韧性好,与垃圾填埋场的地基变形相协调。

In order to develop one kind of slurry with low permeability coefficient and certain adsorption and block to pollutants in leachate,it is used in anti-seepage engineering of leachate for domestic waste landfill site.Through the orthogonal experiment,the selected optimal formula of the slurry with a bentonite base are：Bentonite 20%~30%,cement 15%~25%,fly ash 20%~25%,Na2CO3 1.0%~1.4%,diluent FCLS 0.35%~ 0.75%,and etcaeteras is water.This slurry has a concretion stone ratio of greater than 99.6%,concretion body 28 day coefficient of permeability of less than 0.8×10-7 cm/s,compressive strength of less than 2.0 MPa.The slurry concretion body＇s hindered CODCr,BOD5、NH4-N and phosphorus adsorption rates reach upper 82%,block rate reach upper 99% to Hg,Pb and other heavy metal ions.The slurry concretion body＇s permeability coefficient is low,and its adsorbed or blocked function to landfill site leachate is very well,meanwhile,it has considered reducing the compressive strength and brittleness of the concretion body,enabling it to have certain plasticity and toughness adapted for the distortion of the base for domestic waste landfill site.