Changes of Fly Ash Properties during Aging
Publication: Journal of Environmental Engineering
Volume 141, Issue 5
Abstract
Aging of refuse-derived fuel (RDF) fly ashes was investigated in a long-term laboratory experiment. Aging affected the chemical stability of RDF fly ash in terms of leaching behavior, ANC, and mineralogical transformations. The design of experiment model evaluation showed that the use of RDF ashes in a top cover liner construction has the following advantages: most of the investigated hazardous elements like Pb, Cl, Cr, Cu, etc., will not be released from the ashes, and their buffer capacity will increase with time. However, aging has the disadvantage that leaching of Zn and is likely to increase. The multivariate data analysis of the coefficients of variation did not reveal any systematic errors in the performance of the experiment. However, batch leaching test not always reflect the real situation in the landfill top cover environment.
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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, and Professor Dr. Suraya Heuss-Assbichler and Dr. Frank Söllner for the possibility to visit Ludwig Maximilian University of Munich and helping to analyze ash samples with scanning electron microscopy.
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 5 • May 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 2, 2013
Accepted: Sep 12, 2014
Published online: Nov 4, 2014
Discussion open until: Apr 4, 2015
Published in print: May 1, 2015
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