Document Detail


Mobilization and entry of DNAPL pools into finer sand media by cosolvents: two-dimensional chamber studies.
MedLine Citation:
PMID:  12487414     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Michael E Van Valkenburg; Michael D Annable
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of contaminant hydrology     Volume:  59     ISSN:  0169-7722     ISO Abbreviation:  J. Contam. Hydrol.     Publication Date:  2002 Dec 
Date Detail:
Created Date:  2002-12-18     Completed Date:  2003-03-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8805644     Medline TA:  J Contam Hydrol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  211-30     Citation Subset:  IM    
Affiliation:
Department of Chemistry, 2355 Fairchild Drive, Suite 2N225, United States Air Force Academy, Colorado Springs, CO 80840-6230, USA. mike.vanvalkenburg@usafa.af.mil
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MeSH Terms
Descriptor/Qualifier:
Benzenesulfonates / 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:
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:
J Contam Hydrol. 2004 May;70(1-2):147-50   [PMID:  15068872 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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