Study on the basic characteristics of MSWI fly ash in northern China

DOI

10.2991/mmme-16.2016.112How to use a DOI?

Keywords

fly ash; basic characteristics; heavy metals; leaching toxicity; speciation

Abstract

Fly ash sample collected from a facility which treat urban waste with combustion, the major physio-chemical features of which were studied including chemical composition; the heavy-metal content, speciation as well as leaching toxicity; surface morphology analysis and composition within the mineralogical phase using XRF, ICP, SEM and XRD. Results from the experiments indicate that the primary elements contained in the fly ash are Cl, K, Na, S, Ca and Si, and Zn, Pb and Cu all belong to the category of primary heavy metals. Crystalline phase's analysis demonstrated that the fly ash is primarily composed of some soluble salts like KCl, NaCl and some crystals as SiO2 and CaSO4. In terms of morphology of the fly ash, it is irregular, along with aggrega-tion of both amorphous structures and polycrystalline. This structure makes the fly ash strong adsorption ca-pacity on heavy metals, dioxin and other pollutants. The leaching toxities of all the observed elements of Zn, Cu, Pb, Ni, Cd have all exceeded the limits of Landfill Waste Requirement in China (GB16889-2008) and the leachate concentration realated to Pb, Zn, Cd have also exceeded the limitation of Chinese Identification Standard for Hazardous Wastes (GB5085.3-2007). According to the results of sequential extraction, high mo-bililty of Cd, Pb and Zn has been discovered in this research. Consequently, this could pose a threat to the sur-roundings when MSWI fly ash is landfilled or reutilized.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jianguo Zhou
AU  - Shuguang Zhang
AU  - Ping Li
PY  - 2016/10
DA  - 2016/10
TI  - Study on the basic characteristics of MSWI fly ash in northern China
BT  - Proceedings of the 2016 4th International Conference on Mechanical Materials and Manufacturing Engineering
PB  - Atlantis Press
SP  - 482
EP  - 486
SN  - 2352-5401
UR  - https://doi.org/10.2991/mmme-16.2016.112
DO  - 10.2991/mmme-16.2016.112
ID  - Zhou2016/10
ER  -