| Mobilization and entry of DNAPL pools into finer sand media by cosolvents: two-dimensional chamber studies. | |
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MedLine Citation:
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PMID: 12487414 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two-dimensional chamber studies were conducted to determine qualitative and quantitative performance of cosolvents targeted at pooled dense non-aqueous phase liquid (DNAPL) (perchlorethylene, PCE) residing above a fine-grain capillary barrier. Downward mobilization of DNAPL, up gradient along an overriding cosolvent front, was observed. This produced significant pooling above a fine-grain layer that in some cases lead to entry into the capillary barrier beneath. Entry pressure calculations using physical and hydrogeologic parameters provided an excellent prediction of breakthrough of DNAPL into the capillary barrier. Calculations predict approximately 0.5 m of DNAPL would be necessary to enter a Beit Netofa clay, under extreme cosolvent flooding conditions (100% ethanol). Gradient injection of cosolvent did not appear to provide any benefit suggesting a rapid decrease in interfacial tension (IFT) compared to the rate of DNAPL solubilization. Use of a partitioning alcohol (tertiary butyl alcohol, TBA) resulted in DNAPL swelling and reduced entry into the capillary barrier. However, the trapping of flushing solution, containing PCE, could potentially lead to longer remediation times. |
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Authors:
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Michael E Van Valkenburg; Michael D Annable |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of contaminant hydrology Volume: 59 ISSN: 0169-7722 ISO Abbreviation: J. Contam. Hydrol. Publication Date: 2002 Dec |
Date Detail:
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Created Date: 2002-12-18 Completed Date: 2003-03-14 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8805644 Medline TA: J Contam Hydrol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 211-30 Citation Subset: IM |
Affiliation:
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Department of Chemistry, 2355 Fairchild Drive, Suite 2N225, United States Air Force Academy, Colorado Springs, CO 80840-6230, USA. mike.vanvalkenburg@usafa.af.mil |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Benzenesulfonates
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chemistry Coloring Agents / chemistry Environmental Pollution* Ethanol / chemistry Silicon Dioxide / chemistry* Surface Tension Tetrachloroethylene / chemistry* Water Pollutants, Chemical* tert-Butyl Alcohol / chemistry |
| Chemical | |
Reg. No./Substance:
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0/Benzenesulfonates; 0/Coloring Agents; 0/Water Pollutants, Chemical; 127-18-4/Tetrachloroethylene; 25305-78-6/brilliant blue; 64-17-5/Ethanol; 75-65-0/tert-Butyl Alcohol; 7631-86-9/Silicon Dioxide |
| Comments/Corrections | |
Comment In:
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J Contam Hydrol. 2004 May;70(1-2):147-50
[PMID:
15068872
]
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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