S reactivity of an oil sands composite tailings deposit undergoing reclamation wetland construction

Reid, Michelle; Warren, Lesley A.

doi:10.1016/j.jenvman.2015.10.014

Cited by 19 publications

(15 citation statements)

References 17 publications

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“…As described elsewhere (Reid and Warren, 2016), solid CT samples were collected from depth via coring of the CT deposit at the adjacent Kingfisher Fen site ( Figure 1). The Kingfisher site overlies the same CT deposit as the Sandhill fen, but was accessible to drilling as the proposed second test of the dry reclamation approach at this site had not yet been initiated.…”

Section: Solid Ct Sample Collectionmentioning

confidence: 99%

“…Upon collection, biofilm units were sealed inside sterile Whirlpak bags and kept on ice until they could be frozen and stored at -20 °C. Detailed descriptions of the aqueous geochemistry of each compartment have been previous reported in Reid and Warren (2016).…”

Section: Biofilm Unit Collectionmentioning

confidence: 99%

“…Water samples that corresponded to the biofilm unit deployments were collected for DOC analysis in Sept 2013 and June 2014 using polyethylene tubing and an inertial lift (Waterra) pump system. Samples were collected and analyzed as per Reid and Warren (2016). Briefly, wells were purged of ~3x well volume before collecting sample water into precombusted glass bottles.…”

Section: Bulk Analyses: Dissolved Organic Carbon (Doc) Total Organicmentioning

confidence: 99%

“…Hot water extraction of sand removes 88-95 % of bitumen (Masliyah et al, 2004) and the residual bitumen organic carbon present in CT is highly recalcitrant, so that microbial sulphate reduction was assumed to be limited by access to labile organic carbon. However, the observation of H 2 S generation raised the question whether introduction of younger, relatively more labile organic carbon from the developing wetland was stimulating microbial sulphate reduction within the system (Reid and Warren, 2016). The objectives of the current study were to elucidate the carbon sources being utilized by the in situ microbial communities within the fen/CT system.…”

Section: Introductionmentioning

confidence: 99%

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Elucidating carbon sources driving microbial metabolism during oil sands reclamation

Bradford

Ziolkowski

Goad

et al. 2017

Journal of Environmental Management

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Microbial communities play key roles in remediation and reclamation of contaminated environments via biogeochemical cycling of organic and inorganic components. Understanding the trends in in situ microbial community abundance, metabolism and carbon sources is therefore a crucial component of effective site management. The focus of this study was to use radiocarbon analysis to elucidate the carbon sources driving microbial metabolism within the first pilot wetland reclamation project in the Alberta oil sands region where the observation of HS had indicated the occurrence of microbial sulphate reduction. The reclamation project involved construction of a three compartment system consisting of a freshwater wetland on top of a sand cap overlying a composite tailings (CT) deposit. Radiocarbon analysis demonstrated that both dissolved and sediment associated organic carbon associated with the deepest compartments (the CT and sand cap) was primarily fossil (ΔC = -769 to -955‰) while organic carbon in the overlying peat was hundreds to thousands of years old (ΔC = -250 to -350‰). Radiocarbon contents of sediment associated microbial phospholipid fatty acids (PLFA) were consistent with the sediment bulk organic carbon pools (Peat: ΔC = -257‰; Sand cap ΔC = -805‰) indicating that these microbes were using sediment associated carbon. In contrast, microbial PLFA grown on biofilm units installed in wells within the deepest compartments contained much more modern carbon that the associated bulk carbon pools. This implied that the transfer of relatively more modern carbon was stimulating the microbial community at depth within the system. Correlation between cellular abundance estimates based on PLFA concentrations and the ΔC indicated that the utilization of this more modern carbon was stimulating the microbial community at depth. These results highlight the importance of understanding the occurrence and potential outcomes of the introduction of relatively bioavailable carbon to mine wastes in order to predict and manage the performance of reclamation strategies.

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Section: Solid Ct Sample Collectionmentioning

confidence: 99%

Section: Biofilm Unit Collectionmentioning

confidence: 99%

Section: Bulk Analyses: Dissolved Organic Carbon (Doc) Total Organicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elucidating carbon sources driving microbial metabolism during oil sands reclamation

Bradford

Ziolkowski

Goad

et al. 2017

Journal of Environmental Management

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“…1). These intermediate sulfur species have implications in both chemical and microbial processes and could impact the treatment approaches for soured reservoirs (Hissner et al 1999;O'Reilly et al 2001;Tang et al 2009;Warren et al 2008;Reid and Warren 2016). The reduced forms of sulfur appear in various oxidation-reduction (redox) reactions and can react with each other in the aqueous solution influencing the souring/scaling process.…”

Section: Introductionmentioning

confidence: 99%

Reservoir souring: sulfur chemistry in offshore oil and gas reservoir fluids

Basafa

Hawboldt

2018

J Petrol Explor Prod Technol

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The injection of sulfate-containing seawater into an oil reservoir, for maintaining the reservoir pressure, can promote the growth of sulfate reducing bacteria and archaea near the injection wells, leading to the formation of sulfides such as hydrogen sulfide. However, intermediate sulfur species with different valence states, such as polythionates and polysulfides have been detected in several produced water samples, likely a result of phase partitioning, and chemical and microbial reactions. These sulfur species could affect the microbial communities (e.g., microbially influenced corrosion) and will impact the efficiency of souring mitigation methods. In addition, the presence of these sulfur species can result in operational, environmental, and treatment problems. Therefore, development and implementation of souring control strategies during production cycle of oil and gas reservoirs require identifying the origins, reactivity, and the partitioning behaviour of these compounds. This paper presents an overview of the known mechanisms responsible for reservoir souring and then focuses on the chemical reactions and sulfur species associated with production and consumption of hydrogen sulfide. In this work we highlight complexity of the sulfur chemistry and that the assumption that all the sulfate is reduced to hydrogen sulfide can lead to inappropriate souring management methods. The paper also reviews the detection and analysis methods used for sulfur compounds. The review demonstrates that there is a gap in the current souring models and methods due to the exclusion of key sulfur compounds and challenges in identifying and quantifying these compounds with respect to speed of analysis and sample stability.

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Design of ionic liquids for dewatering stable solid/liquid complex slurries

et al. 2021

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Exploitation of mineable oil sands in Canada has thus far produced over 50 km 2 of tailings in ponds where the fine solids remain suspended for years, even decades. These ponds represent a major liability and environmental burden for operating companies, with their dewatering critical to their remediation. In this work, we used the chemistry of the tailing pond constituents to design an ionic liquid (IL) for dewatering the mature fine tailings (MFT), taking advantage of the ability to introduce unique and different functionalities into each ion of the IL. We chose a class of protic ILs whose ions will interact with the solids while rejecting water. As an example, octylammonium oleate can be used to remove more than 70% of the water from MFT. The nature of the ILs makes their use amenable to a variety of large-scale separation techniques allowing engineering versatility in the design of the final process.

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S reactivity of an oil sands composite tailings deposit undergoing reclamation wetland construction

Cited by 19 publications

References 17 publications

Elucidating carbon sources driving microbial metabolism during oil sands reclamation

Elucidating carbon sources driving microbial metabolism during oil sands reclamation

Reservoir souring: sulfur chemistry in offshore oil and gas reservoir fluids

Design of ionic liquids for dewatering stable solid/liquid complex slurries

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