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Oil Sands Environmental Management Bibliography

The Cumulative Environmental Management Association (CEMA)partnered with the Oil Sands Research and Information Network (OSRIN) to create the new Oil Sands Environmental Management Bibliography, which includes documents relevant to the environmental management of oil sands development in Alberta. The majority of the documents focus on the mineable oil sands in the Athabasca deposit, though some documents relate to in-situ developments. This bibliography was last updated in November 2014.

Solar assisted method for recovery of bitumen from oil sand

Year of Publication: 2009

Abstract:
A novel concept for the recovery of bitumen from oil sands in a natural gas limited environment with and without CO2 constraints is presented. We suggest a feasible method for the recovery of unconventional oil in an environmentally friendly and sustainable way that has the potential of eliminating the need of natural gas as a process fuel. The proposed concept involves mid temperature steam generation for stimulating an oil sand formation. The steam is generated by utilizing solar radiation. The method uses the thermal mass of the oil sand formation to allow for cyclic steam injection during solar availability while still yielding continuous bitumen recovery. Feasibility assessments of the concept from both a thermodynamic and financial point of view are presented for a scenario of development in the Athabasca region in Alberta, Canada.

Solids transport in laminar open channel flow of non-Newtonian slurries

Authors Spelay, R. B.
Year of Publication: 2007

Abstract:
Thickened tailings production and disposal continue to grow in importance in the mining industry. In particular, the transport of oil sands tailings is of interest in this study. These tailings must be in a homogeneous state (non-segregating) during pipeline flow and subsequent discharge. Tailings are often transported in an open channel or flume. Slurries containing both clay and coarse sand particles typically exhibit non-Newtonian rheological behaviour. The prediction of the flow behaviour of these slurries is complicated by the limited research activity in this area. As a result, the underlying mechanisms of solids transport in these slurries are not well understood. To address this deficiency, experimental studies were conducted with kaolin clay slurries containing coarse sand in an open circular channel. A numerical model has been developed to predict the behaviour of coarse solid particles in laminar, open channel, non-Newtonian flows. The model involves the simultaneous solution of the Navier-Stokes equations and a scalar concentration equation describing the behaviour of coarse particles within the flow. The model uses the theory of shear-induced particle diffusion (Phillips et al., 1992) to provide a number of relationships to describe the diffusive flux of coarse particles within laminar flows. A sedimentation flux has been developed and incorporated into the Phillips et al. (1992) model to account for gravitational flux of particles within the flow. Previous researchers (Gillies et al., 1999) have shown that this is a significant mechanism of particle migration. The momentum and concentration partial differential equations have been solved numerically by applying the finite volume method. The differential equations are non-linear, stiff and tightly coupled which requires a novel means of analysis. Specific no-flux, no-slip and no-shear boundary conditions have been applied to the channel walls and free surface to produce simulated velocity and concentration distributions. The results show that the model is capable of predicting coarse particle settling in laminar, non-Newtonian, open channel flows. The results of the numerical simulations have been compared to the experimental results obtained in this study, as well as the experimental results of previous studies in the literature.

Solutions to the high costs of future water restrictions for new oil sands industry along the Athabasca River

Year of Publication: 2014

Abstract:
Limits on water diversions from the Athabasca River may affect the growing oil sands industry in the medium term. For new entrants, the costs of future water restrictions may be high due to the combination of a strict water conservation regulation, a profitable oil sector that relies on fresh water, and water allocation in order of licence seniority. Though river flows would, for the most part, be preserved and well within 90% of the flows recorded upstream of industry, the future value of water for oil production is estimated to be up to $80 per cubic metre in a single period (peak spot value, approx.), and $72,000 per megalitre if drawn annually as an ongoing, continuous demand (average marginal value in present terms). These results are based on certain model assumptions, including flows that are 10% less than the historic record, a simplified depiction of the production costs and revenues of oil producers, and no access to technologies that may reduce the cost of water restrictions. Using a medium-term (~2020) static demand scenario, a policy and two technologies to reduce the costs of water restrictions are assessed. A combined policy-technology response was found to be the most cost effective. As various technologies that lower costs are already planned or in use, further consideration of an efficient water allocation policy, such as water charges, that may reduce costs by providing incentives for efficiency and technology investment across all firms – not just new entrants – is recommended. In general, the results of this study indicate the importance of designing regulations that encourage conservation goals to be achieved at least cost. Future studies may consider the water diversion limits in the Athabasca River, including whether the costs of conservation are commensurate with the economic value of in-stream flows.

Solvent screening for non-aqueous extraction of Alberta oil sands

Year of Publication: 2013

Abstract:
Non-aqueous extraction of bitumen from oil sands has the potential to reduce fresh water demand of the extraction process and eliminate tailings ponds. In this study, different light hydrocarbon solvents, including aromatics, cycloalkanes, biologically derived solvents and mixtures of solvents were compared for extraction of bitumen from Alberta oil sands at room temperature and ambient pressure. The solvents are compared based on bitumen recovery, the amount of residual solvent in the extracted oil sands tailings and the content of fine solids in the extracted bitumen. The extraction experiments were carried out in a multistage process with agitation in rotary mixers and vibration sieving. The oil sands tailings were dried under ambient conditions, and their residual solvent contents were measured by a purge and trap system followed by gas chromatography. The elemental compositions of the extraction tailings were measured to calculate bitumen recovery. Supernatants from the extraction tests were centrifuged to separate and measure the contents of fine solid particles. Except for limonene and isoprene, the tested solvents showed good bitumen recoveries of around 95%. The solvent drying rates and residual solvent contents in the extracted oil sands tailings correlated to solvent vapour pressure. The contents of fine solids in the extracted bitumen (supernatant) were below 2.9% for all solvents except n-heptane-rich ones. Based on these findings, cyclohexane is the best candidate solvent for bitumen extraction, with 94.4% bitumen recovery, 5 mg of residual solvent per kilogram of extraction tailings and 1.4 wt% fine solids in the recovered bitumen.

Solving the puzzle: Environmental responsibility in oilsands development

Year of Publication: 2011

Abstract:
The Government of Alberta faces a narrow and critically important window of opportunity to raise the bar on oilsands development. While there are new plans and frameworks in development that strive to use a cumulative e ects management approach to balance economic development opportunities and social and environmental considerations, we question if the emphasis placed on these considerations is capable of achieving the environmental outcomes consistent with the expectations of Albertans and Canadians. It is time to set higher standards and improve the rules governing oilsands development.

Some chemical and physical properties of soil materials associated with the reclamation of mined tar sands areas

Year of Publication: 1974

Abstract:
This document consists of two tables providing chemical and physical properties of soil, peat, overburden, spent sand and lean tar sand from Syncrude and Suncor.

Some chemical and physical properties of tailings water from oil sands extraction plants

Year of Publication: 1979

Abstract:
We have carried out quantitative analyses of dissolved sodium, potassium, calcium, magnesium, chloride, carbonate, bicarbonate, ‘alkalinity’, sulphate, aluminum, iron, and silicon in tailings water from the GCOS tailings pond and from the Syncrude pilot plant. Surface tensions of these waters have been measured over a range of pH values, and effects of added Mg2+ and Ca2+ ions on surface tension have been investigated. Some similar measurements have been made on ‘synthetic pond water’. Infrared and proton n.m.r. measurements have been made on the organic material extracted from GCOS pondwater. This information on tailings water is relevant to the large accumulation of tailings that has become known as the ‘pondwater problem’ in connection with extraction of bitumen from mined Alberta oil sands.

Some methods for treating tar sands tailings: Part 1 - laboratory application of CO2 process and related testing of type "X" treatment

Authors
Year of Publication: 1973

Abstract:
This report concerns some methods whereby the liquid waste from plants using the Clark hot water process to extract bitumen from tar sands is rendered clean. This report describes some novel experiments on liquid tailings from the G. C. O. S. plant, which may lead to an economically feasible tailings treatment process. The majority of the said novel experiments consist basically of adding carbon dioxide to the tailings. After this treatment the fines in the tailings settle out leaving the water part of the tailings clean and with an environmentally acceptable pH value. In some variations of the carbon dioxide treatment method it is possible to recover some of the bitumen in the tailings. The non carbon dioxide experiments consist of simply adding a readily available compound to the tailings. In this case similar sedimentation results as with this report describes some novel experiments on liquid tailings from the G. C. O. S. plant, which may lead to an economically feasible tailings treatment process.

Some methods for treating tar sands tailings: Part 2 - Theory of CO2 process

Authors
Year of Publication: 1974

Abstract:
This remaining part of the report deals with the theoretical aspects of the reactions between carbon dioxide and tailings.

Sorption of cyclohexane on oil sands tailings

Authors Vagi, L.
Year of Publication: 2012

Abstract:
The use of solvents for extraction of bitumen is attractive because no wet tailings are produced. Studies have already shown that hydrocarbon solvents can achieve the same level of bitumen recovery as the current aqueous extraction method. However, solvent recovery must be very efficient to avoid environmental impact and economic feasibility. In order to scale up solvent extraction processes, the adsorption and desorption interactions with mineral surfaces must be quantified. In this study, cyclohexane adsorption and desorption behaviour on clay is characterized by sorption isotherms performed at constant pressure for temperatures from 20 to 40°C, partial pressures of cyclohexane in nitrogen gas up to 10 kPa, and sample sizes from 50 mg to 2000 mg. The average monolayer coverage was calculated to be 0.056 mmol/g for a 50 mg sample. The average enthalpy of sorption was calculated to be about 40 kJ/mol.

Sorption of naphthenic acids to soil minerals

Authors Marsh, W. P.
Year of Publication: 2006

Abstract:
The sorption of naphthenic acids on clays, soils and oil sands coke was examined using a batch sorption partitioning method. The influence of different clay minerals, exchangeable cation, salt content, organic content in the soil samples, and the pH of the solution on the sorption of naphthenic acids was determined. Experiments were conducted using both commercial naphthenic acids (Merichem) and extracted naphthenic acids originating from tailings pond water. The pH was determined to have the greatest influence with partitioning coefficients (KD) for clays ranging from 18 to 57 mL g-1 for pH 6, and 0 to 10 mL g-1 for pH 8. These results indicate high mobility of naphthenic acids in soil-water systems.

Spatial and temporal correlates of mass bird mortality in oil sands tailings ponds

Year of Publication: 2011

Abstract:
On October 25 and 26, 2010, 547 dead birds were recovered and recorded by operators in the oil sands region of Alberta. These deaths exceeded the occasional mortalities that are reported by operators in a typical year and resulted in an investigation by Alberta Environment.

Spatial and temporal distribution of ambient nitric acid and ammonia in the Athabasca oil sands region Alberta

Year of Publication: 2010

Abstract:
Monthly average ambient concentrations of gaseous nitric acid (HNO3) and ammonia (NH3) were monitored at the Athabasca Oils Sands Region (AOSR), Alberta, Canada, between May 2005 and September 2008. Generally, concentrations of both pollutants were elevated and highly variable in space and time. The highest atmospheric concentrations occurred in the vicinity of the major mining and oil extraction activities of Fort Murray and Fort McKay. Maximum monthly average concentrations of HNO3 decreased from >6 μg m–3 2005 and 2006 to <4 μg m–3 in 2007 and 2008. While the HNO3 summer seasonal averages in 2005 and 2006 approached ~2 μg m–3 at some sites, in the subsequent summers and during winter seasons it rarely exceeded 1 μg m–3 and no clear differences between summer and winter occurred. Concentrations of NH3 were elevated during the entire study and frequently reached 6 μg m–3. Generally, NH3 stayed higher in summer than in winter; the summer seasonal averages often exceeded 4 μg m–3 while those for winter only on two occasions were above 3 μg m–3. In summer 2008, an expansion of the area with elevated NH3 levels was observed extending to remote locations. Ammonia is of a much higher concern from a perspective of possible biological effects, because of its potential for direct toxic effect on lichens and its contribution to the elevated N dry deposition with possible negative consequences for forests and other ecosystems.

Spatial and temporal variation in sediment-associated microbial respiration in oil sands mine-affected wetlands of north-eastern Alberta Canada

Year of Publication: 2010

Abstract:
We measured whether carbon loss in the form of sediment-associated microbial respiration differed between unvegetated sediments of recently constructed oil sands process-affected (OSPM) and reference wetlands. Constituents of OSPM-wetlands (increased salinity, conductivity) were expected to influence respiration, increasing gas (methane and carbon dioxide) flux and sediment oxygen demands (SOD) compared to reference wetlands. However, OSPM-wetlands released 1/10th the methane of reference wetland sediments but did not differ in CO2 ebulition. Sediment oxygen demand (SOD) rates were twofold higher in OSPM than reference wetlands; chemical SOD exceeded biological SOD for both wetland classes (~90% of total SOD). OSPM-wetland sediments, likely have less microbial activity and more chemical oxidation than reference wetlands. Carbon accrual is necessary for reclaiming Alberta boreal wetlands. Low microbial activity may promote carbon sequestration within OSPM-wetlands but high chemical SOD may limit available oxygen for benthos respiration.

Spatial patterns of natural polycyclic aromatic hydrocarbons in sediment in the lower Athabasca River

Year of Publication: 2004

Abstract:
The Athabasca Oil Sands is one of the four natural oil sands deposits in Northern Alberta, Canada, and are by far the largest oil sand deposit in North America, covering an area of 46,000 km2. Sediment samples were collected from the bed and bank of several tributaries that have naturally occurring exposures of oil sand material. Oil sand deposited along the lower Athabasca River, more than 100 km downstream of naturally occurring oil sand exposures, were also sampled. The levels of alkylated polycyclic aromatic hydrocarbons (PAHs) in samples collected from these various locations ranged from not detected to almost 50 ppm. Using dibenzothiophene/chrysene (C2/D2 vs. C3/D3) double ratio plots, it is possible to approximate the relative degree of degradation or weathering of the PAHs from these various sediment deposits along the lower Athabasca River and its tributaries. Similarly a plot of dibenzothiophene/phenanthrene (D2/P2 vs. D3/P3) indicate the possible origins of the oil. A combination of these plots, D3/P3 vs. D3/C3, was particularly useful in identifying weathering characteristics of different sources of the oil. Comparison of alkylated PAH distributions between the lower Athabasca River and the tributaries show slight differences consistent with different petrogenic sources and/or different weathering patterns.

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