垃圾焚烧飞灰浸出特性及固化试验的研究  

Study on leaching properties and immobilization of municipal solid waste incineration fly ash

作　　者：周敏[1] 杨家宽[1] 肖明丹[1] 张杜杜[1] 何宝平[1] 肖波[1] 

机构地区：[1]华中科技大学环境科学与工程学院,武汉430074

出　　处：《环境工程学报》2007年第2期119-123,共5页Chinese Journal of Environmental Engineering

基　　金：华中科技大学研究生基金资助项目(Z0325)

摘　　要：垃圾焚烧飞灰残留有重金属元素和二恶英等物质而被认为是危险废物,必须对之进行稳定化处理。通过试验研究分析了国内首家自主开发成功的广东省东莞市某回转窑垃圾焚烧发电厂垃圾焚烧飞灰的化学成分及矿物组成,研究了飞灰的浸出毒性,考察了水泥固化焚烧飞灰的效果,并与熔融/玻璃固化进行了比较。研究表明,该焚烧飞灰中重金属Cd的浸出毒性严重超标,并且随pH值的减小而增大,水泥固化效果随龄期的增大而更加显著。熔融/玻璃固化的效果优于水泥固化,但其经济性有待提高。Municipal solid waste incineration（MSWI） fly ash contains many heavy metals and dioxins,so it is regarded as hazardous waste and should be stabilized before disposal. Fly ash samples have been obtained from a incineration power plant in Dongguan City of Guangdong Province,which is the first solid waste power plant with the rotary kiln process developed by itself in China. The chemical compositions and crystal components of fly ash samples were analyzed. The leaching properties of MSWI fly ash were studied. The effect of immobilization of cement on MSWI fly ash was investigated, and compared with the effect of melting and glass solidification. The results show that the leaching toxicity of Cd in MSWI fly ash is higher than the standard,and increases with the decreases of the pH of leachate. The effect of immobilization of cement on MSWI fly ash gets better with the increase of the age. The effect of melting and solidification is better than immobilization of cement, but the cost of melting method needs to be reduced.

关 键 词：垃圾 焚烧 飞灰 重金属 浸出毒性 水泥 玻璃固化 

分 类 号：X705[环境科学与工程—环境工程] TQ172.9[化学工程—水泥工业]