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Permanent link (DOI): https://doi.org/10.7939/R35D8NP2C

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Understanding Two-step Polymer Flocculation of Oil Sands Tailings Open Access

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Other title
Subject/Keyword
Magnafloc
two-step flocculation
oil sands tailings
temperature responsive polymers
polymer flocculant
chitosan
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Lu, Qiuyi
Supervisor and department
Zeng, Hongbo (Chemical and Materials Engineering)
Liu, Yang (Civil and Environmental Engineering)
Examining committee member and department
Zeng, Hongbo (Chemical and Materials Engineering)
Liu, Yang (Civil and Environmental Engineering)
Luo, Jingli (Chemical and Materials Engineering)
Huang, Biao (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Chemical Engineering
Date accepted
2016-03-30T11:49:19Z
Graduation date
2016-06
Degree
Master of Science
Degree level
Master's
Abstract
In this study, a two-step flocculation method by combining anionic and cationic polymeric flocculants on the treatment of oil sands tailings was investigated. Compared to conventional flocculation by using a single anionic or cationic polymer, which has been a widely exploited procedure for flocculation of oil sands tailings and mineral tailings, the two-step flocculation with anionic Magnafloc 1011 (MF) and cationic chitosan showed an enhanced capacity in the treatment of oil sands tailings by improving the quality of released water, i.e. high clarity and low solid content, yet retaining a high settling efficiency. This improved flocculation performance is attributed to combined flocculation effects induced by bridging effect of the anionic polymer and charge neutralization of cationic polymer. The replacement of chitosan by a synthesized temperature responsive polymer, chitosan-g-PMEOMA (CgM), resulted in more water release and better consolidation. The CgM polymer chains adsorbed on solids at temperatures below the low critical solution temperature (LCST) become more hydrophobic at temperatures above LCST which results in particle aggregation by hydrophobic attraction. This work provides useful information and insights into the development of effective technologies for oil sands tailings treatment and settling of colloidal suspensions.
Language
English
DOI
doi:10.7939/R35D8NP2C
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
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