Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74646
Title: Removal of metallic Al and Al/Zn alloys in MSWI bottom ash by alkaline treatment
Authors: Xuan, D 
Poon, CS 
Keywords: Alkali-silica effect
Alkaline treatment
Heavy metals
Incineration bottom ash
Metallic Al and alloy
Issue Date: 2018
Publisher: Elsevier
Source: Journal of hazardous materials, 2018, v. 344, p. 73-80 How to cite?
Journal: Journal of hazardous materials 
Abstract: In order to reduce the leaching of pollutants and remove the Al and Zn/Al alloy from municipal solid waste incineration bottom ash (MSWIBA), an optimized alkaline pre-treatment procedure was developed in this study. The influences of alkaline conditions on the removal rate of Al and Zn/Al alloy were investigated, including [OH]− concentration, temperature, particle size, liquid/solid ratio and treatment duration. The experimental results showed that the optimized alkaline pre-treatment conditions to efficiently remove the Al and Zn/Al alloy was by using a minimum of 1.0 mol/l [OH]−, at 55 °C and with a minimal liquid/solid ratio of 5. The removal rate of Al and Zn/Al alloy followed an S-shape curve, in which the slow beginning stage was attributed to the protection of the oxidation layer and the quenched product around the Al and Al/Zn alloy. After 3 h of the optimized alkaline pre-treatment, the leaching of Cr, Cu, Pb and Zn of the treated MSWIBA was reduced by more than 90% of that of the original MSWIBA. The alkali-silica reaction test further indicated that the expansion of concrete prepared with the pre-treated MSWIBA was significantly reduced and there was no macro-crack or spalling damage on the surface of the tested specimens.
URI: http://hdl.handle.net/10397/74646
ISSN: 0304-3894
EISSN: 1873-3336
DOI: 10.1016/j.jhazmat.2017.10.002
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