Geochemically structural characteristics of municipal solid waste incineration fly ash particles and mineralogical surface conversions by chelate treatment

Environmental Science and Pollution Research International
Hiroki KitamuraFumitake Takahashi

Abstract

Leaching behaviors of heavy metals contained in municipal solid waste incineration (MSWI) fly ash have been studied well. However, micro-characteristics of MSWI fly ash particles are still uncertain and might be non-negligible to describe their leaching behaviors. Therefore, this study investigated micro-characteristics of MSWI fly ash particles, especially their structural properties and impacts of chelate treatment on surface characteristics. According to SEM observations, raw fly ash particles could be categorized into four types based on their shapes. Because chelate treatment changed the surface of fly ash particles dramatically owing to secondary mineral formations like ettringite, two more types could be categorized for chelate-treated fly ash particles. Acid extraction experiments suggest that fly ash particles, tested in this study, consist of Si-base insoluble core structure, Al/Ca/Si-base semi-soluble matrices inside the body, and KCl/NaCl-base soluble aggregates on the surface. Scanning electron microscope (SEM) observations of the same fly ash particles during twice moistening treatments showed that KCl/NaCl moved under wet condition and concentrated at different places on the particle surface. However, element mob...Continue Reading

References

Sep 15, 2004·Journal of Hazardous Materials·Alessandra Polettini, Raffaella Pomi
Jul 15, 2006·Journal of Hazardous Materials·Feng-Yim Chang, Ming-Yen Wey
Jun 28, 2008·Journal of Hazardous Materials·Jiri HyksThomas H Christensen
Nov 16, 2010·Journal of Hazardous Materials·C LamprisC R Cheeseman

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Citations

Aug 3, 2016·Environmental Science and Pollution Research International·Aiyoub AbbaspourBora Cetin
Aug 10, 2019·Environmental Science and Pollution Research International·Lizhi TongQing Hu
May 14, 2018·Environmental Science and Pollution Research International·Hiroki KitamuraFumitake Takahashi
Jul 20, 2019·Environmental Science and Pollution Research International·Thittaya Ngamsang, Monthira Yuttitham
Apr 6, 2021·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Huan WangRongyan Zhang

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