Hydrocarbon Exclusion from Ground Water during Freezing

Tumeo, Mark A.; Davidson, Bret

doi:10.1061/(asce)0733-9372(1993)119:4(715)

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…The LNAPL permeability decreases with increasing ice content, but does not reach zero ,,– . Further studies examined the spreadability of LNAPL on ice or snow ,, and the freeze-thaw behavior of organic solutes not involving NAPL – . A mass balance model of dissolved benzene in soil subject to freeze-thaw indicates that its concentration ahead of the freezing front can exceed its aqueous solubility .…”

Section: Introductionmentioning

confidence: 99%

Mobilization and Rupture of LNAPL Ganglia during Freeze-Thaw: Two-Dimensional Cell Experiments

Niven

Singh

2008

Environ. Sci. Technol.

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Experiments were conducted on dodecane at residual saturation (21-26%) in a two-dimensional water-saturated glass bead cell (0.5 mm diameter)--to simulate light nonaqueous phase liquid (LNAPL) trapped below the water table--subject to controlled freeze-thaw cycles. The experiments reveal substantial remobilization and rupture of LNAPL ganglia during freeze-thaw, especially during the first few cycles. This includes the detachment and upward mobilization of LNAPL from larger ganglia during upward propagation of the freezing front; the formation of numerous subsinglet ganglia during this transport process, and their entrapment in ice; and the coalescence of such small ganglia during thawing, to form larger singlets. Theoretical calculations suggest that the LNAPL redistribution is caused by large freezing-induced pressure gradients, of up to 6 orders of magnitude higher than the water-LNAPL interfacial (capillary) pressure. The findings have important implications for the understanding and remediation of LNAPLs in cold climate regions.

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Section: Introductionmentioning

confidence: 99%

Mobilization and Rupture of LNAPL Ganglia during Freeze-Thaw: Two-Dimensional Cell Experiments

Niven

Singh

2008

Environ. Sci. Technol.

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“…Several interesting laboratory studies have been conducted that show increases in PHC and organic solvent concentrations at the leading edge of a freezing front (Konrad and Seto 1991;Tumeo and Davidson 1993;Biggar and Neufeld 1996;Chuvilin andothers 2001a, 2001b). Konrad and Seto (1991) conducted one-dimensional freezing tests on a partially water-saturated clay sample contaminated with the miscible organic solvent 1-propanol.…”

Section: Introductionmentioning

confidence: 99%

“…Chuvilin andothers (2001a, 2001b) subjected mixtures of different types of compacted soils (sand, silt, and clay) containing PHC to top-down freezing and measured the resulting PHC distribution in the sample. Tumeo and Davidson (1993) used a saturated groundwater flow chamber to investigate the effects of freezing on exclusion of phenol from flowing groundwater. For the sand samples, these researchers believe that the PHC was displaced from pore spaces to the downward progressing freezing front.…”

Section: Introductionmentioning

confidence: 99%

“…These researchers speculate that the mechanism for diesel migration may be due to very small fissures (microchannels) formed in the soil during freezing resulting in capillary movement of the diesel. Tumeo and Davidson (1993) used a saturated groundwater flow chamber to investigate the effects of freezing on exclusion of phenol from flowing groundwater. Their tests differ from previously described studies in that the soil was saturated and phenol-contaminated water was flowing in response to an induced gradient.…”

Section: Introductionmentioning

confidence: 99%

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Equilibrium distribution of petroleum hydrocarbons in freezing ground

Barnes¹,

Wolfe

Filler³

2004

Polar Record

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Past documented laboratory measurements have shown movement of petroleum hydrocarbons to the freezing front in contaminated freezing soils. The mechanisms that are, in part, responsible for the increased contaminant concentration at the freezing front are illustrated in this study with a mass-balance model. Results from this quantitative analysis show that this concentration increase is due to exclusion of petroleum hydrocarbon from the crystalline ice structure and from physical displacement of liquid petroleum hydrocarbon from the pore space as water freezes and expands into ice. Consequences of this process in relation to contaminant migration in freezing soils through time are discussed.

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