垃圾填埋场PBFC防渗浆材吸附性能试验研究  

Experimental Study on Adsorption Property of PBFC Anti⁃seepage Slurry in Landfill

作　　者：代国忠[1] 盛炎民 李书进[1] 李雄威[1] 施维成[1] DAI Guozhong;SHENG Yanmin;LI Shujin;LI Xiongwei;SHI Weicheng(School of Civil Engineering and Architecture,Changzhou Institute of Technology,Changzhou 213032,China)

机构地区：[1]常州工学院土木建筑工程学院,江苏常州213032

出　　处：《防灾减灾工程学报》2021年第3期470-476,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51678083)资助。

摘　　要：以水泥‑膨润土为主要材料,以粉煤灰替代部分水泥,辅以碳酸钠,聚乙烯醇(PVA)等外掺剂制备一种低渗透性,对垃圾渗滤液具有较好吸附阻滞效果的防渗浆材(即PBFC防渗浆材)。通过该浆材的吸附阻滞试验及SEM微观分析探讨了其吸附阻滞作用机理。SEM图显示,掺入PVA可使水泥水化反应更充分,从而提高浆材吸附性能。PBFC防渗浆材的PVA掺量为1.5 g/L时,其渗透系数最低可达到0.7×10^(-8) cm/s。通过PBFC防渗浆材吸附阻滞作用的有效发挥,垃圾场渗滤液中部分有害成分的浓度达到了《城市生活垃圾填埋场污染控制标准》的要求,且PVA掺量为1.5 g/L时,渗滤液有害成分的浓度值降到最低,这与PVA对防渗浆材渗透系数的影响是一致的。PB‑FC防渗浆材对铅、汞等重金属离子的吸附阻滞率接近100%,满足生活垃圾填埋场的使用要求。A low permeability anti-seepage slurry material(PBFC anti-seepage slurry material)was prepared with cement-bentonite as the main material,fly ash as the substitute for part of cement,to‑gether with sodium carbonate,polyvinyl alcohol(PVA),and other admixtures,which has good ad‑sorption and retardation effect on landfill leachate.The adsorption and retardation mechanism of the slurry was discussed through adsorption and retardation tests and SEM micro-analysis.The SEM re‑sults show that adding PVA can make cement hydration reaction more sufficient,thus improving the adsorption performance of slurry.When the PVA content of PBFC anti-seepage slurry is 1.5 g/L,the permeability coefficient can be as low as 0.7×10^(-8) cm/s.Through the effective use of PBFC antiseepage slurry,the concentration of some harmful components in landfill leachate meets the require‑ment of Pollution Control Standard for Municipal Domestic Waste Landfill.When the content of PVA is 1.5 g/L,the concentration of harmful components in leachate decreases to the lowest level,which is consistent with the effect of PVA on the permeability coefficient of the anti-seepage slurry.The ad‑sorption retardation rate of the PBFC anti-seepage slurry to heavy metal ions,such as lead and mercury,is close to 100%,which meets the use requirements of domestic garbage landfills.

关 键 词：PBFC防渗浆材 渗透系数 聚乙烯醇(PVA) 吸附阻滞作用 

分 类 号：TU528.32[建筑科学—建筑技术科学]