城市垃圾焚烧飞灰中Pb、Cd、Zn去除工艺研究  

Study on Removal Process of Pb,Cd and Zn in Municipal Solid Waste Incineration Flying Ash

作　　者：王申申[1] 蹇丽[1] 高小健[1] 盛妤[1] 杨啟秀 

机构地区：[1]海南医学院热带医学与检验医学院,海南海口571199

出　　处：《安徽农业科学》2015年第30期195-198,共4页Journal of Anhui Agricultural Sciences

基　　金：国家大学生创新创业训练计划项目(201211810079);海南医学院创新性实验项目(HYCX201311)

摘　　要：[目的]研究HCl和Na2EDTA对城市生活垃圾焚烧飞灰中Pb、Cd和Zn的浸洗效果及工艺。[方法]针对海口市生活垃圾焚烧飞灰,研究HCl和Na2EDTA两种不同浸洗剂对飞灰中重金属的浸洗效果,并对浸洗前后飞灰中重金属形态的变化进行了分析。[结果]HCl对3种重金属都有较好的浸洗效果,去除效果为Cd>Zn>Pb。Na2EDTA对Pb和Cd的浸洗效果较好,对Zn的去除率远低于其他2种重金属。HCl对飞灰浸洗的适宜条件:室温下浓度为0.8 mol/L,液固比为10,淋洗时间为180 min。Na2EDTA对飞灰浸洗的适宜条件:室温下浓度为0.05 mol/L,液固比为15,淋洗时间为360 min。浸洗后飞灰中3种重金属可交换态和碳酸盐结合态的比例减小,残渣态的比例显著增大,飞灰的稳定性增加。[结论]该研究可为飞灰的处理处置及资源化利用提供科学依据。[ Objective ] The research aimed to study removal effects and processes of Pb, Cd and Zn in municipal solid waste incineration fly- ing ash by using HCl and Na2 EDTA as the leaching agents. [ Method ] For Haikou solid waste incineration flying ash, leaching effects of heavy metals in flying ash by using HCl and Na2EDTA as the leaching agents were studied. Form change of heavy metal in flying ash before and after leaching was analyzed. [ Result] HCl had better leaching effects on the three kinds of heavy metals, and removing effect sequence was Cd 〉 Zn 〉 Pb. Leaching effects of Ph and Cd were better by Na2EDTA, while Zn removal rate was far lower than the other two heavy metals. Suit- able conditions of flying ash leaching by HCl were as below： 0. 8 mol/L at room temperature, 10 of liquid/solid ratio and 180 rain of leaching time. Suitable conditions of flying ash leaching by Na2 EDTA were as below ： 0.05 mol/L at room temperature, 15 of liquid/solid ratio and 360 min of leaching time. After leaching, the proportions of exchangeable state and carbonate bound state for the three kinds of heavy metals re- duced, while the proportion of residue state increased significantly, and stability of flying ash increased. [ Conclusion ] The research could pro- vide scientific basis for processing and resource utilization of flying ash.

关 键 词：飞灰 重金属 HCL Na2EDTA 去除率 

分 类 号：S181.3[农业科学—农业基础科学]