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	Investigation of basic properties of fly ash from urban waste incinerators in China
	Jiang Jian-guo ; Xu Xin ; Wang Jun ; Yang Shi-jian ; Zhang Yan
	2010-05-10 ; 2010-05-10
关键词	urban waste incinerator fly ash heavy metals leaching toxicity BEHAVIOR Environmental Sciences
中文摘要	Basic properties of fly ash samples from different urban waste combustion facilities in China were analyzed using as X-ray fluorescence (XRF), scanning electron microscopy (SEM), X-ray diffraction (XRD). The leaching toxicity procedure and some factors influencing heavy metals distribution in fly ash were further investigated. Experimental results indicate that the fly ash structures are complex and its properties are variable. The results of XRF and SEM revealed. that the major elements (> 10000 mg/kg, listed in decreasing order of abundance) in fly ash are O, Ca, Cl, Si, S, K, Na, Al, Fe and Zn. These elements account for 93% to 97%, and the content of Cl ranges from 6.93% to 29.18%, while that of SiO2 does from 4.48% to 24.84%. The minor elements (1000 to 10000 mg/kg) include Cr, Cu and Pb. Primary heavy metals in fly ash include Zn, Pb, Cr, Cu etc. According to standard leaching test, heavy metal leaching levels vary from 0 to 163.10 mg/L (Pb) and from 0.049 to 164.90 mg/L (Zn), mostly exceeding the Chinese Identification Standard for hazardous wastes. Morphology of fly ash is irregular, with both amorphous structures and polycrystalline aggregates. Further research showed that heavy metals were volatilized at a high furnace temperature, condensed when cooling down during the post-furnace system and captured at air pollution control systems. Generally, heavy metals are mainly present in the forms of aerosol particulates or tiny particulates enriched on surfaces of fly ash particles. The properties of fly ash are greatly influenced by the treatment capacities of incinerators or the variation of waste retention time in chamber. Fly ash from combustors of larger capacities generally has higher contents of volatile component and higher leaching toxicity, while those of smaller capacities often produce fly ash containing higher levels of nonvolatile components and has lower toxicity. The content of heavy metals and leaching toxicity maybe have no convincing correlation, and high alkali content of CaO greatly contribute to leaching toxicity of heavy metal and acid neutralization capacity against acid rain.
语种	英语 ; 英语
出版者	SCIENCE CHINA PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23370]
专题	清华大学
推荐引用方式 GB/T 7714	Jiang Jian-guo,Xu Xin,Wang Jun,et al. Investigation of basic properties of fly ash from urban waste incinerators in China[J],2010, 2010.
APA	Jiang Jian-guo,Xu Xin,Wang Jun,Yang Shi-jian,&Zhang Yan.(2010).Investigation of basic properties of fly ash from urban waste incinerators in China..
MLA	Jiang Jian-guo,et al."Investigation of basic properties of fly ash from urban waste incinerators in China".(2010).

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