Leaching characteristics of heavy metals during cement stabilization of fly ash from municipal solid waste incinerators  

作　　者：Shunwen LIANG Jianguo JIANG Yan ZHANG Xin XU 

机构地区：[1]Environment and Sanitary Management Department,Shenzhen 518001,China [2]Department of Environment Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Frontiers of Environmental Science & Engineering》2008年第3期358-363,共6页环境科学与工程前沿（英文）

基　　金：This work was supported by the National High Technology Research and Development Program of China(863 Program)(Grant No.20002AA644010);the Key Technologies Research and Development Program of the Tenth Five-Year Plan of China(Grant No.2003BA604A-11-07).

摘　　要：The leaching characteristics of heavy metals in products of cement stabilization of fly ash from a municipal solid waste incinerator were investigated in this paper.The stabilization of heavy metals such as Cd,Pb,Cu,and Zn in fly ash from such incinerators was examined through the national standard method in China based on the following factors:additive quantity of cement and Na_(2)S,curing time,and pH of leaching liquor.The results showed that as more additives were used,less heavy metals were leached except for Pb,which is sensitive to pH of the leachate,and the worse effect was observed for Cd.The mass ratio of cement to fly ash=10% is the most appropriate parameter according to the national standard method.When the hydration of cement was basically finished,stabilization of heavy metals did not vary after curing for 1 d.The mixtures of cement and fly ash had excellent adaptability to environmental pH.The pH of leachate was maintained at 7 when pH of leaching liquor varied from 3 to 11.

关 键 词：municipal solid waste(MSW) fly ash heavy metal solidification and stabilization CEMENT 

分 类 号：X70[环境科学与工程—环境工程]