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Leaching from solid waste incineration ashes used in cement-treated base layers for pavements

Cai, Z.; Bager, Dirch H.; Christensen, T.H.

Authors

Dirch H. Bager

T.H. Christensen



Abstract

Waste incineration bottom ash and treated flue gas cleaning products mixed with 2.5% of cement (50 kg/m 3) were tested in the laboratory in terms of compressive strength and tank leaching tests over a 64-day period. Although the material displayed lower mechanical strength than a reference concrete, the strength still was sufficient for use as a base layer for roads. The metal content in the incineration-residue-based specimens was up to 100 times higher than in the reference concrete, suggesting that the mixed waste incineration residue should be used only for dedicated purposes. The leaching of Cl and Na was increased by a factor of 20-100 from the incineration-residue-based specimens as compared to the reference, while the leaching of K, Ca and SO 4 was increased by a factor of 2-10. The leaching of heavy metals was also higher from the incineration-residue-based specimens than from the reference with respect to Cu (50 times), Cd, Pb and Zn (5 times), but not with respect to Cr and Ni. The leaching curves did only allow for a closer evaluation of the leaching process in a few cases. The physical retention of the constituents seemed to be the same in the reference as in the incineration-residue-based specimens. Heavy metal leaching was limited by enhanced chemical retention in the incineration-residue-specimens as compared to the reference. Since no quality criteria in terms of leaching from a monolithic material are currently available, the leaching issue must be evaluated case by case.

Citation

Cai, Z., Bager, D. H., & Christensen, T. (2004). Leaching from solid waste incineration ashes used in cement-treated base layers for pavements. Waste Management, 24(6), 603-612. https://doi.org/10.1016/j.wasman.2004.01.010

Journal Article Type Article
Acceptance Date Jan 26, 2004
Online Publication Date Apr 9, 2004
Publication Date Jun 1, 2004
Deposit Date Apr 24, 2020
Journal Waste Management
Print ISSN 0956-053X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 24
Issue 6
Pages 603-612
DOI https://doi.org/10.1016/j.wasman.2004.01.010
Keywords Waste Management and Disposal
Public URL http://researchrepository.napier.ac.uk/Output/2655240