The effect of spontaneous gas expansion and mobilization on the aqueous-phase concentrations above a dense non-aqueous phase liquid pool

Mumford, Kevin G.; Smith, James E.; Dickson, S. E.

doi:10.1016/j.advwatres.2010.02.002

Cited by 25 publications

(39 citation statements)

References 38 publications

(108 reference statements)

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“…Slow horizontal flow and transport in the capillary fringe can allow n-alkane degradation products to outgas with limited interaction with the rest of the plume. Lab-scale experiments have demonstrated discontinuous gas phase mobilization through a DNAPL pool, which generated significant concentrations of the gas compound above the pool [Mumford et al, 2010]. A recent study in a natural asphalt lake reported anaerobic microbes in miniscule water droplets entrapped in oil, providing field evidence for oil degrading apart from the bulk aqueous environment [Meckenstock et al, 2014].…”

Section: 1002/2015wr016964mentioning

confidence: 99%

Reactive transport modeling of geochemical controls on secondary water quality impacts at a crude oil spill site near Bemidji, MN

Bekins

Cozzarelli

et al. 2015

Water Resources Research

131

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Anaerobic biodegradation of organic amendments and contaminants in aquifers can trigger secondary water quality impacts that impair groundwater resources. Reactive transport models help elucidate how diverse geochemical reactions control the spatiotemporal evolution of these impacts. Using extensive monitoring data from a crude oil spill site near Bemidji, Minnesota (USA), we implemented a comprehensive model that simulates secondary plumes of depleted dissolved O 2 and elevated concentrations of Mn 21 , Fe 21 , CH 4 , and Ca 21 over a two-dimensional cross section for 30 years following the spill. The model produces observed changes by representing multiple oil constituents and coupled carbonate and hydroxide chemistry. The model includes reactions with carbonates and Fe and Mn mineral phases, outgassing of CH 4 and CO 2 gas phases, and sorption of Fe, Mn, and H 1 . Model results demonstrate that most of the carbon loss from the oil (70%) occurs through direct outgassing from the oil source zone, greatly limiting the amount of CH 4 cycled down-gradient. The vast majority of reduced Fe is strongly attenuated on sediments, with most (91%) in the sorbed form in the model. Ferrous carbonates constitute a small fraction of the reduced Fe in simulations, but may be important for furthering the reduction of ferric oxides. The combined effect of concomitant redox reactions, sorption, and dissolved CO 2 inputs from source-zone degradation successfully reproduced observed pH. The model demonstrates that secondary water quality impacts may depend strongly on organic carbon properties, and impacts may decrease due to sorption and direct outgassing from the source zone.

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Section: 1002/2015wr016964mentioning

confidence: 99%

Reactive transport modeling of geochemical controls on secondary water quality impacts at a crude oil spill site near Bemidji, MN

Bekins

Cozzarelli

et al. 2015

Water Resources Research

131

View full text Add to dashboard Cite

show abstract

“…In addition, MIP differs from IP because the sites represent a sub-region of the medium (as opposed to an individual pore) and they can be occupied by multiple fluids (Kueper & McWhorter, 1992). Similar to Mumford et al (2010), this study used the capillary pressure -saturation relationship (equation 4.22), to model the occurrence of two fluids (water and gas) within one site.…”

Section: Numerical Modeling Of Bubble Movementmentioning

confidence: 99%

“…However, the gas movement module which used the MIP algorithm, within the combined ETM/MIP model, was called upon only once the gas saturation exceeded the critical gas saturation (S gcr ). This value, taken to be 0.3 (Mumford et al, 2010), represented the gas saturation that a block needed to reach in order for the gas in one block to be connected to the gas in an adjacent block. Any grid block with a gas saturation over S gcr could be included in a multi-block cluster and able to mobilize, fragment, or expand.…”

Section: Numerical Modeling Of Bubble Movementmentioning

confidence: 99%

“…These concentrations were used in the mass transport module, where the aqueous mass was transported according to the advection-dispersion equation. The gas movement module identified gas clusters and determined whether the bubbles mobilized or expanded using a MIP algorithm, as described by Mumford et al (2010). Equilibrium calculations were performed after each mass transport and gas movement step.…”

Section: Numerical Modeling Of Bubble Movementmentioning

confidence: 99%

“…The simulations presented below were completed by combining the two-dimensional electro-thermal model (ETM) discussed above and a macroscopic invasion percolation (MIP) model. The MIP technique is based on the model of Mumford et al (2010) and modified for non-isothermal conditions. Therefore, the model applied the same assumptions as Mumford et al, (listed below) as well as those related to a heated subsurface:…”

Section: Numerical Modeling Of Bubble Movementmentioning

confidence: 99%

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In Situ Thermal Remediation of DNAPL Source Zones

Johnson¹,

Tratnyek²,

Sleep³

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Report Documentation PageForm Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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Modification of a 3D printer to create geologically realistic heterogeneous sand packs

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Mumford

Mullins

et al. 2022

Vadose Zone Journal

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There is a need to develop more accessible approaches to generate geologically realistic microheterogeneous structures in quasi‐two‐dimensional flow cells for use in light transmission experiments. In addition to automating the packing procedure to increase repeatability, such approaches would allow multiple researchers to investigate multiphase flow through similar heterogeneities across time and space. In this study, a three‐dimensional (3D) printer was modified to accommodate a sand‐filled hopper and used to create replicate packs that were similar to one another and to those produced in previous studies using a different apparatus. Replicate gas (CH4) injections were also used to assess the reproducibility of gas distributions in these replicate packs. Macroscopic features of the sand packs (bed height, number and location of laminae) and gas distributions (trapped gas volume, maximum gas width) were reproducible, but local‐scale features of the gas distribution (gas pathway, ganglia‐to‐pool ratio) were more variable.

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The effect of spontaneous gas expansion and mobilization on the aqueous-phase concentrations above a dense non-aqueous phase liquid pool

Cited by 25 publications

References 38 publications

Reactive transport modeling of geochemical controls on secondary water quality impacts at a crude oil spill site near Bemidji, MN

Reactive transport modeling of geochemical controls on secondary water quality impacts at a crude oil spill site near Bemidji, MN

In Situ Thermal Remediation of DNAPL Source Zones

Modification of a 3D printer to create geologically realistic heterogeneous sand packs

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