城市垃圾焚烧炉渣重金属含量特征及其资源化利用途径

Heavy Metal Determination and Beneficial Comprehensive Utilization of Municipal Waste Incinerator Reside

利用原子吸收光谱仪测定城市垃圾不同粒径焚烧底渣中重金属的含量,并分析了其资源化利用途径。研究结果表明,粒径小于5mm的底渣是主要成分,占整个底渣的59.42%。底渣中重金属的含量差别较大,其中Zn、Cr和Cu的含量明显高于其他重金属含量,而Cd含量最低。底渣中重金属的含量都远远超过土壤环境保护标准(GB15618-1995)及当地土壤背景值。不同粒径底渣中重金属有较大差异,其中Cr、Zn、Cd和Ni在小粒径中含量较高,而Cu和Pb在各类粒径中含量分布不明显。

The content of heavy metals （ Cu, Cr, Cd, Pb, Zn and Ni ） was determined by Atomic absorption spectrophotometer （ AAS ） and their distributions were analyzed in various waste incineration slags. The results showed that the particle size less than 5mm were a major component in the slag, which were about 59.42% in all the incineration slags. The content of heavy metals was different in the incineration slags. The content of heavy metals Zn, Cr and Cu were significantly higher than that of other heavy metals and that of Pb was in second, followed by Ni, and that of Cd was in the least. The contents of these heavy metals were higher than that of the soil environmental quality standards （ GB15618-1995 ） and the background values in soil of Guangdong. The distribution of heavy metals in different particles of the slag were very different, in which the content of Cr, Zn, Cd and Ni were higher in the small particle sizes, but that of Cu and Pb was not obvious in various particles.