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Application of Microbial Culture and Rhamnolipid for Improving the Sedimentation of Oil Sand Tailings | OMICS International | Abstract
ISSN: 2155-6199

Journal of Bioremediation & Biodegradation
Open Access

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Research Article

Application of Microbial Culture and Rhamnolipid for Improving the Sedimentation of Oil Sand Tailings

Soroor Javan Roshtkhari and Catherine N Mulligan*

Civil and Environmental Engineering, Concordia University, Montreal, Québec, Canada

*Corresponding Author:
Catherine N Mulligan
Civil and Environmental Engineering
Concordia University, Montreal, Québec, Canada
Tel: 5148482424 extn. 7925
E-mail: [email protected]

Received date: April 13, 2016; Accepted date: June 30, 2016; Published date: July 01, 2016

Citation: Roshtkhari SJ, Mulligan CN(2016) Application of Microbial Culture and Rhamnolipid for Improving the Sedimentation of Oil Sand Tailings. J Bioremed Biodeg 7:358. doi:10.4172/2155-6199.1000358

Copyright: © 2016 Roshtkhari SJ, et al. This is an open-a ccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Densification of oil sand tailings deposited in the tailing ponds and recovering water from them are two major challenges in the oil sands surface mining industry. A small increase in the tailings settlement rate (which normally is very slow) can improve the densification of tailings and significantly reduce water consumption and the volume of the tailing ponds. In this work, the objective was to evaluate the role of a mixed culture of two microbial strains isolated from weathered oil and rhamnolipid (JBR 425) together with these strains in the sedimentation of fine tailing particles. It has been found that a mixed culture of two microbial strains isolated from weathered oil increased the sedimentation. Rhamnolipid (0.5%) together with these two microbial strains at 15°C ± 2°C showed significant increases in sedimentation (by a factor of 5.1), the concentration of larger particles (by a factor of 2.63), the particle mean diameter (by a factor of 2.70) and flocculation in the tailings samples compared to the control while the zeta potential is still negative. This means that the mechanism of flocculation is probably due to increasing the hydrophobicity of the particles, interaction of biosurfactant and high molecular weight microbial organic compounds through a bridging mechanism with clay particles. This work shows the potential of using rhamnolipid and microbial culture in order to increase the oil sand sedimentation through flocculation and microbial activity in a more environmentally friendly densification process.

Keywords

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Citations : 6613

Journal of Bioremediation & Biodegradation received 6613 citations as per Google Scholar report

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