Factors Influencing Chemical and Mineralogical Changes in RDF Fly Ashes during Aging
Publication: Journal of Environmental Engineering
Volume 140, Issue 3
Abstract
The effects of aging should be considered for reliable long-term assessments of the environmental risks of the use of refuse-derived-fuel (RDF) fly ash as landfill top cover liner material. Mineral transformations that occur in RDF fly ash, and the effects of selected factors on these transformations, were studied on compacted fly ash specimens in an accelerated aging experiment using a reduced factorial design. Carbon dioxide concentration, temperature, relative air humidity, time, and the quality of added water were varied in six factor combinations. Acid neutralization capacity and leaching behavior were analyzed after four different periods of time. The results were evaluated with multivariate data analysis. A significant change in the acid neutralization capacity, a decrease in leaching of Ba, Ca, , Cr, Cu, Pb, K, and Na, and an increase in solubility of Mg, Si, Zn, and could be attributed to different aging conditions.
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Acknowledgments
The authors wish to thank the Swedish Research Council Formas and the landfill operator Telge Återvinning AB for financial support. Special thanks are directed to Dr. Gustav Tham for support; Igor Travar for valuable help with sampling and preparing the fly ash samples; Ulla-Britt Uvemo and the students Elin Andersson and Jaana Ekblom for help in the laboratory; Prof. T. Shimaoka for help in analyzing our samples at the SPring-8 facility (Japan) with high-energy synchrotron radiation powder X-ray diffraction; and Assoc. Prof. Jurate Kumpiene for her valuable comments. The authors acknowledge D. C. McMurry for language editing.
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Published In
Journal of Environmental Engineering
Volume 140 • Issue 3 • March 2014
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© 2013 American Society of Civil Engineers.
History
Received: Jan 29, 2013
Accepted: Oct 25, 2013
Published online: Dec 12, 2013
Published in print: Mar 1, 2014
Discussion open until: May 12, 2014
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