<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>32</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Arkell, N.P.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Accelerated dewatering of oil sands tailings by microbially induced chemical changes</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">geotechnical properties</style></keyword><keyword><style  face="normal" font="default" size="100%">laboratory</style></keyword><keyword><style  face="normal" font="default" size="100%">microbiology</style></keyword><keyword><style  face="normal" font="default" size="100%">tailings</style></keyword><keyword><style  face="normal" font="default" size="100%">tailings treatment</style></keyword><keyword><style  face="normal" font="default" size="100%">UofA</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://hdl.handle.net/10402/era.29063</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">University of Alberta Department of Renewable Resources </style></publisher><pub-location><style face="normal" font="default" size="100%">Edmonton, AB </style></pub-location><pages><style face="normal" font="default" size="100%">122 pages </style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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. </style></abstract><custom2><style face="normal" font="default" size="100%">Alberta oil sands </style></custom2><custom3><style face="normal" font="default" size="100%">http://www.worldcat.org/oclc/819446287</style></custom3><custom4><style face="normal" font="default" size="100%">OSEMB</style></custom4></record></records></xml>