水洗磷酸盐预处理后飞灰中重金属的热稳定性  

Thermal Stability of Heavy Metals in MSWI Fly Ash Using Phosphate Via Water Washing Pretreatment

作　　者：仉博[1] 杨晓燕[1] 孙福成[1] 孙颖[1] 邹庐泉 蒲敏 洪瑞金 肖灿 王欢 李娜 钱光人[1] 

机构地区：[1]上海大学环境与化学工程学院,上海200072 [2]上海市城投环境投资有限公司,上海200336

出　　处：《建筑材料学报》2009年第2期181-185,189,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50808118;20677037)

摘　　要：探讨了磷酸盐对城市生活垃圾焚烧(MSMI)飞灰中重金属在常温下的稳定作用以及高温挥发抑制作用.结果表明,经水洗磷酸盐预处理后,常温下,飞灰中重金属Pb,Cd,Zn,Cr在毒性浸出程序(TCLP)中的浸出浓度低于美国EPA标准限值;高温下,飞灰中重金属Cd,Pb,Zn的挥发率分别由未处理参比样的97.2%,94.3%和79.3%降低至10.2%,23.5%,13.5%,均小于25%.Municipal solid waste incinerator（MSWI） fly ash can be used as raw material for cement.Before utilization the heavy metals and the chloride must be pretreated or stabilized to meet the standard of cement production.The thermal stability of heavy metal after MSWI fly ash was pretreated by phosphate via water washing was studied.The result demonstrates that the chloride concentration declines to 1% and the leaching of heavy metals complies with the TCLP standard.Meanwhile,the thermal stability of heavy metals is prominently enhanced.The evaporation ratios（by mass） of Cd,Pb and Zn of pretreated fly ash are 10.2%,23.5%,and 13.5% compared with that of 97.2%,94.3% and 79.3% for untreated fly ash.

关 键 词：垃圾焚烧(MSWI)飞灰 水洗 重金属 磷酸盐 热稳定性 

分 类 号：X705[环境科学与工程—环境工程]