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Permanent link (DOI): https://doi.org/10.7939/R3JS9HG8H

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Diluted MFT Settling by Ozonation; A Mechanistic Study Open Access

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Other title
Subject/Keyword
MFT, Ozonation, Water Chemistry, Perticle settlement
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Tumpa,Fahmida H
Supervisor and department
Dr. Leonidas Perez Estrada,Civil & Environmental Engineering
Dr. Yang Liu, Civil & Environmental Engineering
Examining committee member and department
Dr. Yang Liu, Civil & Environmental Engineering
Dr. Leonidas Perez Estrada,Civil & Environmental Engineering
Dr. Mohamed Gamal El Din, Civil & Environmental Engineering (chair)
Dr. Zaher Hashisho, Civil & Environmental Engineering
Department
Department of Civil and Environmental Engineering
Specialization
Environmental Science
Date accepted
2014-07-09T11:23:57Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
The oil sands tailings generated after bitumen extraction are permanently contained in lake-size ponds. Primarily the tailings ponds are used to settle the solid particles so the cap water could be recycle back to the extraction operations, while the tailings with higher concentration of suspended particles, like Mature Fine Tailings (MFT), need to be treated by other means. Different methods have been developed to accelerate the dewatering of MFT, such the use of different polymers and gypsum. Chemical treatments like ozonation could treat diluted MFT to release the trapped water, as a novel method for the settlement of MFT particles and recovery of water. Ozonation of MFT led to a substantial pH change (from 8.4 to ≤ 4.0) that helped the fine particle to be settled. Formation of small organic acids after the oxidation process led to this pH drop. The objective of this research was to study the substantial pH change during the ozonation of diluted MFT, and its possible correlation to MFT particle settlement. During the ozone treatment an increment in the concentration of ions was observed, as well as the formation of carboxylic bonds on the surface of MFT particles, and the release of humic acids to form metal humate complexes. The increment on conductivity, salinity, and ionic strength during the ozone treatment suggested that the drop of the pH could influence the settlement mechanism. Changes on the particle surface properties improve the settlement of particles and led to the release of trapped water. It was concluded that changes in particle conformation and suspension caused by a drop in the pH were major factors in MFT aggregation.
Language
English
DOI
doi:10.7939/R3JS9HG8H
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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