摘要
采用pH为5.5的醋酸-醋酸钠缓冲溶液作为浸提液,建立飞灰固化体的动态/半动态浸出实验,研究填埋场渗滤液导排系统正常和淤堵时飞灰固化体的长期浸出行为。结果表明:动态和半动态实验中Pb、Zn、Cr、Cd的浸出过程均受扩散控制,但动态浸出的延续时间更长,半动态浸出的重金属浓度及总量更高。在飞灰填埋处置过程中,应保持渗滤液导排系统畅通,避免发生堵塞;此外,还应关注飞灰固化体长期浸出的环境影响。
The semi-dynamic and dynamic leaching tests of fly ash solidified body,in which the acetic acid-sodium acetate buffer solution with pH=5.5 was used as extracting liquid,were conducted to study the leaching behavior of solidified body,during the normal and silting of landfill leachate system.The results showed that the leaching process of Pb,Zn,Cr and Cd in dynamic and semi-dynamic experiments were controlled by diffusion,and the leaching process of dynamic was longer than semi-dynamic,while the concentration and total amount of heavy metals was significantly higher in semi-dynamic test.Therefore,the leachate drainage system should be kept clear to avoid clogging in disposal process of fly ash.In addition,the environmental impact of long-term leaching of fly ash solidified body should also be concerned.
作者
李清毅
宋凯
何亮
牟陈亚
骆成杰
王飞
刘建
LI Qing-yi;SONG Kai;HE Liang;MOU Chen-ya;LUO Cheng-jie;WANG Fei;LIU Jian(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China;State-province Joint Engineering Laboratory of Spatial Information Technology for High-Speed Railway Safety,Chengdu 610031,China)
出处
《环境工程》
CAS
CSCD
北大核心
2019年第11期149-154,共6页
Environmental Engineering
基金
国家自然科学基金项目(41602241,U1734205)
关键词
飞灰固化体
重金属
动态浸出
半动态浸出
共处置
fly ash solidified body
heavy metal
dynamic leaching
semi-dynamic leaching
co-disposal
