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Permanent link (DOI): https://doi.org/10.7939/R38S55

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Accelerated dewatering of oil sands tailings by microbially induced chemical changes Open Access

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Other title
Accelerated Dewatering of Oil Sands Tailings by Microbially Induced Chemical Changes
Subject/Keyword
Densification
Oil Sand Tailings
Chemistry
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Arkell, Nicholas P
Supervisor and department
Siddique, Tariq (Renewable Resources)
Examining committee member and department
Guigard, Selma (Civil and Environmental Engineering)
Gupta, Ranjender (Chemical and Materials Engineering)
Department
Department of Renewable Resources
Specialization
Land Reclamation and Remediation
Date accepted
2012-09-26T14:36:00Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
Processing of oil sands ores to extract bitumen generates large volumes of tailings which are deposited into large settling basins, where the solids settle by gravity over 3-4 years to become mature fine tailings (MFT). Methanogenesis has been correlated with increased water recovery from and densification of MFT. This phenomenon offers potential tailings management options, including biodensification, an accelerated dewatering process where the microbial community is stimulated by amending MFT with carbon-substrates. The chemistry of methanogenic accelerated dewatering was investigated with 2L and 50L settling columns of MFT amended with carbon-substrates to infer possible mechanisms. It was found that enhanced biogenic gas production induced chemical changes in MFT. The carbon-amended MFT had increased pore-water concentrations of HCO3-, Ca2+, Mg2+ and a lower pH. The pore-water chemistry affects the colloidal properties of the suspended clays in the MFT which leads to the accelerated settling of clay particles and dewatering of MFT.
Language
English
DOI
doi:10.7939/R38S55
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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