城市垃圾焚烧飞灰中重金属的形态及酸浸出性研究  

SPECIATION DISTRIBUTION AND ACID LEACHABILITY OF HEAVY METALS IN MUNICIPAL SOLID WASTE INCINERATION FLY ASH

作　　者：王涛[1] 刘廷凤[1] 高占啟[1] 孙成[1] 

机构地区：[1]污染控制与资源化研究国家重点实验室,南京大学环境学院,南京210093

出　　处：《环境化学》2007年第5期658-661,共4页Environmental Chemistry

基　　金：江苏省科技厅社会发展招标项目(BS2005002)

摘　　要：研究了城市垃圾焚烧飞灰中重金属形态在不同粒径上的分布,以及HNO3对飞灰中重金属的浸出性.结果表明:飞灰中重金属主要以残渣态存在,可交换离子态含量很少;易挥发性的重金属在较大粒径上有较高分布,亲石性重金属Cr和Ni的分布与粒径的相关性不大,在各粒径上的分布较均匀;飞灰中以碳酸盐结合态存在的重金属对酸不稳定,易被HNO3浸出,而残渣态部分对酸较稳定,不易被HNO3浸出.The speciation of heavy metals and their distribution in different particle sizes of municipal solid waste incinerator fly ash were studied, and their leaching behavior by HNO3 was also investigated. The results showed that the residual form was the main speciation for the heavy metals in fly ash, while ion exchangeable form could be negligible. Volatile heavy metals such as Cd, Pb and Zn had a high distribution in larger particles, but lithophilic heavy metals such as Cr and Ni existed homogeneously in the particles. Heavy metals associated with carbonates in fly ash were unstable to acid and could be leached out, whereas those existing in residual form were stable and could not be leached out easily by HNO3.

关 键 词：垃圾焚烧 飞灰 重金属 形态 酸浸出 

分 类 号：X132[环境科学与工程—环境科学]