Barrier performance of activated carbon-soil-bentonite composite
Silty clay(SC)was used as the base soil,and the hydraulic conductivity and adsorption properties of soil-bentonite(SB)and activated carbon soil-bentonite(ASB)with different ratios under different leachate conditions were studied by flexible wall hydraulic conductivity test and static equilibrium adsorption test.The results showed that when Pb(NO3)2 solution was used as the percolate,the hydraulic conductivity of the unit increased gradually with the increase of Pb2+ concentration,and the hydraulic conductivity of SB decreased greatly with the increase of bentonite content and tended to be stable.The incorporation of bentonite and activated carbon could effectively enhance the adsorption performance of the material.With the increase of the concentration of the percolate,the adsorption capacity of SC,SB and ASB for Pb2+ increases,and the difference in adsorption capacity gradually increases.According to the comprehensive impervious performance and groundwater quality standard,the benchmark ratio of barrier materials to meet the remediation of heavy metal contaminated sites was proposed.The research results could provide a reference for the remediation and treatment of heavy metal contaminated sites.
cutoff wallssoil-bentoniteactivated carbonhydraulic conductivityadsorptionstandard ratio
国家科技期刊平台
NSTL
万方数据
维普
