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Identification and Quantification of Chemical Forms of Cu and Zn in MSWI Ashes Using XANES
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. Lund University, Sweden.ORCID iD: 0000-0001-8650-4741
Lund University, Sweden.
RISE Research Institutes of Sweden, Built Environment, Energy and Resources.ORCID iD: 0000-0002-7850-9910
Chalmers University of Technology, Sweden.
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2020 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 34, no 11, p. 14505-14514Article in journal (Refereed) Published
Abstract [en]

Incineration is in many countries a common treatment method for municipal solid waste, and utilization of the ash residues has attracted significant interest. The bottom ash is best suited as a secondary construction material, whereas the fly ash is being investigated as a secondary raw material for recovery of, for example, Zn, Cu, and salts. For both types of application, knowledge about the chemical speciation of Zn and Cu in the ashes is valuable. The present work focuses on identifying and quantifying the chemical species of Zn and Cu in 12 samples of fly ash and bottom ash from three waste-to-energy plants using X-ray absorption near edge structure (XANES). The XANES spectra of the ash samples showed similar distinctive features, and both in the bottom and fly ash samples, the same chemical forms were identified but in various ratios. Cu and Zn occurred in several chemical forms, with typically 5-7 forms present in the same sample. For Cu, the XANES spectra of the fly ash samples were nearly identical, indicating very similar chemical speciation (same chemical forms and similar ratios). Cu was found to exist in various oxide, hydroxide, chloride, silicate, and metallic forms. The most commonly occurring Zn compounds were the aluminate, ferrite, silicate, and oxide along with chloride, basic carbonate (hydrozincite), and occasionally metallic forms, probably alloyed with Cu in brass. Cu occurred in different oxidation states from zero to +II, with a higher prevalence of the lower oxidation states in bottom ash than in fly ash. Zn occurred mainly in oxidation state +II in all ashes analyzed. Finally, we showed that during outdoor storage of bottom ash, levels of Cu and Zn hydroxycarbonates were increased compared to fresh bottom ash. This carbonate formation aims to make Cu and Zn less leachable.

Place, publisher, year, edition, pages
American Chemical Society , 2020. Vol. 34, no 11, p. 14505-14514
Keywords [en]
Ash handling, Ashes, Chemical speciation, Chlorine compounds, Fly ash, Municipal solid waste, Oxidation, Raw materials, Secondary recovery, Silicates, Sodium Aluminate, Waste incineration, Waste treatment, X ray absorption, X ray absorption near edge structure spectroscopy, Zinc compounds, Carbonate formations, Chemical forms, Chemical species, Oxidation state, Secondary Raw Materials, Treatment methods, Waste-to-energy plants, X-ray absorption near-edge structure, Copper compounds
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-51302DOI: 10.1021/acs.energyfuels.0c02226Scopus ID: 2-s2.0-85097964230OAI: oai:DiVA.org:ri-51302DiVA, id: diva2:1516793
Note

Funding details: Stiftelsen för Miljöstrategisk Forskning; Funding details: VINNOVA; Funding details: Vetenskapsrådet, VR; Funding text 1: The authors would like to thank Vinnova (the Sweden’s Innovation Agency), Avfall Sverige (the Swedish Waste Association), Energiforsk−Askprogrammet, VR (the Swedish Research Council), and MISTRA (the Swedish Foundation for strategic Environmental Research) for financial support. Furthermore, Prof. Ellery Ingall, Georgia Tech - Earth & Atmospheric Sciences, for the contributions of samples of zinc silicates, Henric Lassesson, IVL Swedish Environmental Research Institute, and Shun Yu, RISE, for helping out at the beam, are gratefully acknowledged, as well as contributions from E.ON, Fortum Waste Solutions AB, NOAH AS, Sysav Utveckling AB, and STENA Recycling AB.

Available from: 2021-01-12 Created: 2021-01-12 Last updated: 2023-05-25Bibliographically approved

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Rissler, JennyDahl, JonasEdo, Mar

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