城市拆除和装修建筑垃圾重金属浸出特性分析

LEACHING CHARACTERISTICS OF HEAVY METALS FROM URBAN BUILDING-DEMOLITION AND RENOVATION WASTES

以建筑拆除和装修产生的垃圾为研究对象,对可能含有的重金属进行浸出特性研究。结果表明:1)部分建筑垃圾Cr、Pb、Zn含量超过常规土壤背景值,其中聚氯乙烯线管中Pb较背景值高出105倍;2)建筑垃圾中重金属在醋酸缓冲溶液下浸出效果更为显著,石膏板中As、混凝土中Pb与玻璃中Zn的浸出率分别达到34.16%、38.15%与38.21%,分别是硫酸硝酸体系下的12,89,24倍;3)实际场景模拟过程中,酸雨环境仅有Cr、Zn浸出,而生活垃圾渗滤液环境下多种重金属均有浸出,Zn的浸出率最高。

Taking the wastes from building-demolition and renovation as the study object, the leaching characteristics of potential heavy metals were studied. The results showed that: 1) the contents of Cr, Pb, and Zn in some building wastes exceeded the soil background values, especially the content of Pb in PVC tube was 105 times higher than the soil background value;2) the heavy metals in building wastes had a more significant leaching effect in acetic acid buffer solution, and leaching rates of As in gypsum, Pb in concrete and Zn in glass were 34.16%, 38.15%, and 38.21% respectively, which were 12, 89 and 24 times higher respectively than that in sulfuric-nitric acid solution;3) only Cr and Zn leached under the acid rain circumstance during actual scene simulation, while several heavy metals leached under domestic landfill leachate situations, with the leaching rate of Zn being the highest.