摘要
以粉质粘土(SC)作为母土,通过柔性壁渗透试验和静平衡吸附试验分别研究了不同配比的土-膨润土(SB)及活性炭-土-膨润土(ASB)在不同渗滤液工况下的渗透性能及吸附性能。结果表明,将Pb(NO3)2溶液作为渗液,单元体渗透性能随Pb2+浓度增大而逐渐增强,且渗液浓度相同时SB渗透系数随膨润土掺量增加呈大幅降低后趋于平稳趋势。膨润土和活性炭的掺入可有效增强材料的吸附性能,随渗液浓度的增加,SC、SB及ASB对Pb2+的吸附容量变大,且ASB较SC及SB吸附容量差值逐渐变大。综合防渗及地下水质量标准提出了满足修复重金属污染场地阻隔材料的基准配比,研究结果可为重金属污染场地的修复与治理提供参考。
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.
作者
杨梦传
张志红
虞璐
王劲楠
YANG Mengchuan;ZHANG Zhihong;YU Lu;WANG Jinnan(The Key Laboratory of Urban Security and Disaster Engineering,Beijing University of Technology,Beijing 100124,China;Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)
出处
《环境保护科学》
CAS
2024年第1期104-109,共6页
Environmental Protection Science
基金
国家重点研发计划项目(2019YFC1803702)。
