Systematic study of the formation and chemical/mineral composition of waste-to-energy (WTE) fly ash

Waste-to-Energy (WTE) power plants combust post-recycling municipal solid waste (MSW). WTE fly ash (FA) is the air pollution control (APC) residue and is classified as hazardous waste. A systematic study was conducted on the formation, chemical/mineral composition of FA, and the leachability of heav...

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Bibliographic Details
Published in:Materials chemistry and physics 2023-01, Vol.293, p.126849, Article 126849
Main Authors: Tian, Yixi, Themelis, Nickolas J., Bourtsalas, A.C.(Thanos), Kawashima, Shiho, Gorokhovich, Yuri
Format: Article
Language:English
Subjects:
Characterization
Fly ash
Leachability
Mineralogy
Waste-to-energy (WTE)
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Summary:Waste-to-Energy (WTE) power plants combust post-recycling municipal solid waste (MSW). WTE fly ash (FA) is the air pollution control (APC) residue and is classified as hazardous waste. A systematic study was conducted on the formation, chemical/mineral composition of FA, and the leachability of heavy metals. The impacts of two moisture conditions on FA were examined: high-moisture process (semi-dry scrubbing in high water environment; water was added in the ash processing stream), and low-moisture process (spray dryer and circulating dry scrubbing; with no water addition in the ash processing stream). A methodology was established that included the formation of FA particles from two sources (furnace and formed in the scrubber of the APC system) and estimated the empirical formulae for the FA constituents, based on the chemical composition (ICP, XRF, ion chromatography, TGA) and XRD quantification. The dominant species are CaO (40%), Cl (15%), SO3 (8%), CO2 (8%). The crystalline phases (45–50%) consisted of: hydroxides (
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2022.126849