Fluctuation of dissolved heavy metal concentrations in the leachate from anaerobic digestion of municipal solid waste in commercial scale landfill bioreactors: the effect of pH and associated mechanisms

Xie, S., Ma, Y., Strong, P. J. and Clarke, W. P. (2015) Fluctuation of dissolved heavy metal concentrations in the leachate from anaerobic digestion of municipal solid waste in commercial scale landfill bioreactors: the effect of pH and associated mechanisms. Journal of Hazardous Materials, 299 577-583. doi:10.1016/j.jhazmat.2015.07.065

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Author Xie, S.
Ma, Y.
Strong, P. J.
Clarke, W. P.
Title Fluctuation of dissolved heavy metal concentrations in the leachate from anaerobic digestion of municipal solid waste in commercial scale landfill bioreactors: the effect of pH and associated mechanisms
Journal name Journal of Hazardous Materials   Check publisher's open access policy
ISSN 0304-3894
1873-3336
Publication date 2015-12-15
Sub-type Article (original research)
DOI 10.1016/j.jhazmat.2015.07.065
Open Access Status File (Author Post-print)
Volume 299
Start page 577
End page 583
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Abstract Heavy metals present in landfill leachate have infrequently been related to complete anaerobic degradation municipal solid waste (MSW) due to discrete ages of deposited MSW layers and leachate channelling in landfills. In this study, anaerobic digestion of MSW was performed in two enclosed 1000 tonne bioreactors using a unique flood and drain process. Leachates were characterised in terms of pH, soluble chemical oxygen demand, volatile fatty acids (VFAs), ammonium nitrogen and heavy metals over the entire course. All parameters, including the pH, fluctuated during acidogenesis, acetogenesis and methanogenesis, which strongly impacted on the dynamics of dissolved heavy metal concentrations. The simulation of dissolution and precipitation processes indicated that metal sulphide precipitation was not a factor as metal concentrations exceeded solubility limits. The correlation of pH and dissolved heavy metal concentrations indicated that other, or combinatorial, mechanisms were involved at the homogenisation conditions within the bioreactors. Besides the dissolution and precipitation process, the main processes most likely involved in metal distributions were adsorption (Zn, Cu, Ni, Pb and Cd), complexation (Cr) or combinations of both process (As and Co).
Keyword Anaerobic digestion
Flood and drain
Heavy metal
Landfill bioreactor
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
School of Chemical Engineering Publications
Official 2016 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 6 times in Scopus Article | Citations
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Created: Wed, 29 Jul 2015, 15:42:18 EST by Sihuang Xie on behalf of School of Civil Engineering