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Open AccessArticle

Release of Trace Elements from Bottom Ash from Hazardous Waste Incinerators

1
Department of Earth and Environmental Sciences, KU Leuven, 3001 Leuven, Belgium
2
Faculty of Environment, University of Science Vietnam National University Ho Chi Minh City, Ho Chi Minh City 700000, Vietnam
3
Center for Economics and Corporate sustainability, KU Leuven, Brussels B-1000, Belgium
*
Author to whom correspondence should be addressed.
Recycling 2018, 3(3), 36; https://doi.org/10.3390/recycling3030036
Received: 11 July 2018 / Revised: 5 August 2018 / Accepted: 9 August 2018 / Published: 14 August 2018
(This article belongs to the Special Issue Waste Management Practices in Developing Countries)
Bottom ash is the major by-product of waste incineration and can contain trace elements (As, Cd, Co, Cu, Cr, Mo, Ni, Pb, and Zn) with concentrations up to thousands of mg·k−1. In this study, a combination of different extractions and leaching tests (i.e., CH3COOH and ammonium-EDTA (Ethylenediaminetetraacetic acid) extractions and pHstat leaching tests) was used to investigate the potential release of trace elements from bottom ash samples derived from hazardous waste incineration plants. Although large variations have been found in the release of trace elements by different extractions, in general, the highest concentrations of most trace elements (except As and Mo) were released with the CH3COOH extraction, whereas the release of As and Mo was highest with the ammonium-EDTA extraction. Kinetics of element release upon acidification based on a pHstat leaching test at pH 4 could be related to the solid-phase speciation of some selected trace elements. The relatively high-potential mobility and elevated total concentrations of some trace elements imply a threat to the environment if these bottom ashes are not treated properly. Results of the present study may be useful to develop potential treatment strategies to remove contaminants and eventually recover metals from bottom ash. View Full-Text
Keywords: bottom ash; hazardous waste; kinetic release; potential mobility; trace elements; waste management bottom ash; hazardous waste; kinetic release; potential mobility; trace elements; waste management
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Dung, T.T.T.; Vassilieva, E.; Swennen, R.; Cappuyns, V. Release of Trace Elements from Bottom Ash from Hazardous Waste Incinerators. Recycling 2018, 3, 36.

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