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• W4200213613 abstract "Base Mine Lake (BML) was the first commercial-scale demonstration oil sands pit lake established in northern Alberta, Canada. Recent studies indicate that ebullition enhances internal mass loading of dissolved constituents during settlement and dewatering of methanogenic fluid fine tailings (FFT) below the overlying water cap. Here, we describe results of integrated field measurements and numerical modelling to (i) determine potential for ebullition and enhanced mixing within BML, and (ii) assess impacts on chemical mass transport across the tailings-water interface. We observed sharp increases in [CH4(aq)] with depth from <0.1 mg L-1 immediately above the interface to >60 mg L-1 over the upper 1.5 to 3.0 m of FTT. Thermodynamic modelling revealed that maximum [CH4(aq)] values represent 60 to 80% of theoretical saturation, and corresponding total dissolved gas pressures approach or exceed fluid pressures. These findings supported integration of enhanced mixing into one-dimensional (1-D) advective-dispersive transport models, which substantially improved upon previous simulations of conservative tracer (i.e., Cl-) profiles and chemical mass fluxes. The models revealed a positive relationship between CH4(aq) saturation and enhanced mixing, showing that ebullition enhances internal mass loading. This information has potential to inform ongoing assessments of pit lake performance and support improved closure and reclamation planning at oil sands mines." @default.
• W4200213613 created "2021-12-31" @default.
• W4200213613 creator A5035996687 @default.
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• W4200213613 date "2022-02-01" @default.
• W4200213613 modified "2023-10-18" @default.
• W4200213613 title "Ebullition enhances chemical mass transport across the tailings-water interface of oil sands pit lakes" @default.
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• W4200213613 doi "https://doi.org/10.1016/j.jconhyd.2021.103938" @default.
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