Electrokinetic and chemical treatment of oil sands mature fine tailings: dewatering and strengthening-Reference-Cited by-同舟云学术

Electrokinetic and chemical treatment of oil sands mature fine tailings: dewatering and strengthening

Published:2020-08 Issue:3 Volume:173 Page:127-142
ISSN:1755-0750
Container-title:Proceedings of the Institution of Civil Engineers - Ground Improvement
language:en
Short-container-title:Proceedings of the Institution of Civil Engineers - Ground Improvement

Author:

Guo Yu¹^ORCID,Shang Julie Q.²,Lee Joon Kyu³,Wang Yixuan⁴

Affiliation:

1. Geotechnical Specialist, AECOM Canada Ltd, London, ON, Canada (corresponding author: )

2. Professor, Geotechnical Research Center, Department of Civil and Environmental Engineering, Western University, London, ON, Canada

3. Assistant Professor, Department of Civil Engineering, University of Seoul, Seoul, South Korea

4. Research Assistant, Geotechnical Research Center, Department of Civil and Environmental Engineering, Western University, London, ON, Canada

Abstract

Oil sands tailings have become a major challenge in Canada due to various geotechnical and environmental concerns. Mature fine tailings (MFT) typically contain 70% water and 30% silt- and clay-sized solids and have low hydraulic conductivities, which lead to difficulties in consolidation by nature. Electrokinetics (EK) has been proved to be effective at dewatering and strengthening oil sands tailings, but is only limited to the anode area. Further treatment is needed to improve the tailings around the cathode. Chemical stabilisation is a mature technique for ground improvement. However, there is limited information for the combined effects of EK and chemical treatment on high water content geomaterials such as MFT, slurry, sludge and so forth. This research study was carried out to evaluate the effects of combined EK and chemical treatment of MFT. Quicklime and Portland cement were selected as the chemical additives. The changes in water content, undrained shear strength, plasticity, pore-water pH and electrical conductivity and particle zeta potential after treatment were studied. It was found that the chemical treatment reduced the material property difference between the anode and cathode, whereas it reduced EK-induced water flow. Combined EK and chemical treatment of MFT may be beneficial at a low chemical dosage.

Publisher

Thomas Telford Ltd.

Subject

Mechanics of Materials,Soil Science,Geotechnical Engineering and Engineering Geology,Building and Construction

Link

https://www.icevirtuallibrary.com/doi/pdf/10.1680/jgrim.18.00069

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