摘要
以水泥窑常用的替代燃料——生活垃圾和污泥为研究对象,分别测定了重金属As、Cd、Hg、Cu、Pb、Cr、Zn、Ni总量,Cd、Cu、Pb、Zn的形态分布及As、Cr的价态,结果表明:脱水污泥中,8种重金属含量由高到低的顺序为:Zn>Cu>Cr>Pb>Ni>Hg>As>Cd。三种垃圾筛上物中,8种重金属含量由高到低的依次顺序为:Zn>Cr>Cu>Ni>Pb>As>Hg>Cd。市政污泥中,Cd以酸提取态为主,占总量的45%以上;Pb 94%以残渣态存在;Cu以有机结合态为主,占63.16%;Zn以铁锰氧化态为主,占43.5%。三种垃圾筛上物中,Pb几乎没有酸可提取态和铁锰氧化态的存在,重金属Cd没有残渣态存在。原生垃圾中,重金属Zn酸可提取态占18.52%,而堆肥垃圾筛上物和矿化垃圾筛上物中,重金属Zn酸可提取态为1%以下,铁锰氧化态含量为75%左右。垃圾和污泥中,重金属Cr(Ⅲ)、Cr(Ⅵ)均未检出。
Municipal solid waste( MSW) and sewage sludge( SS) were regarded as main alternative fuels in cement kilns,heavy metals total contents of As,Cd,Hg,Cu,Pb,Cr,Zn,Ni and extractable forms of Cd,Cu,Pb and Zn and valence state of As and Cr in MSW and SS were measured. Results showed that in SS,descending order of 8 kinds of heavy metals total contents was Zn > Cu > Cr > Pb > Ni > Hg > As > Cd,in MSW was Zn > Cr > Cu > Ni > Pb> As > Hg > Cd. In SS,the main content of Cd was exchangeable fraction,accounting for more than 45%; of Pb was residual fraction,accounting for 94%; of Cu was oxidisable fraction,accounting for 43. 5%. But in MSW,Pb has few exchangeable fraction and oxidisable fraction,Cd has no residual fraction. In raw MSW,exchangeable fraction of Zn was 18. 52%,but in mineralized MSW and composting MSW,exchangeable fraction of Zn was below 1%.Heavy metals of Cr( Ⅲ) and Cr( Ⅵ) were not detected in both MSW and SS.
出处
《环境工程》
CAS
CSCD
北大核心
2013年第S1期573-576,共4页
Environmental Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB735803
2012CB724603)
关键词
生活垃圾
市政污泥
重金属
形态
价态
municipal solid waste(MSW)
sewage sludge(SS)
heavy metals
extractable forms
valence state
