Remediation of DNAPL Pools Using Dense Brine Barrier Strategies

Although dense nonaqueous phase liquid (DNAPL) pools are an important source of groundwater contamination, little experimental data have been generated to develop a mature level of understanding of the problem, and few strategies specifically aimed at remediation have been advanced. We discuss the d...

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Bibliographic Details
Published in:Environmental science & technology 2001-07, Vol.35 (14), p.3031-3039
Main Authors: Hill, E. H, Moutier, M, Alfaro, J, Miller, C. T
Format: Article
Language:English
Subjects:
Applied sciences
Contamination
Decontamination. Miscellaneous
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental impact
Exact sciences and technology
Experiments
Groundwater
Groundwaters
Natural water pollution
Pollution
Pollution, environment geology
Porosity
Sodium Chloride - chemistry
Soil and sediments pollution
Soil Pollutants - analysis
Surface-Active Agents - chemistry
Water Movements
Water Pollutants - analysis
Water Pollution - prevention & control
Water treatment and pollution
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Summary:Although dense nonaqueous phase liquid (DNAPL) pools are an important source of groundwater contamination, little experimental data have been generated to develop a mature level of understanding of the problem, and few strategies specifically aimed at remediation have been advanced. We discuss the dominant importance of these features in subsurface systems, present novel two- and three-dimensional heterogeneous experimental systems, and show results from two evolving strategies for remediating DNAPL pools. These strategies involve the joint use of a dense brine barrier and controlled mobilization of trapped DNAPL using small-volume surfactant flushes. These experiments demonstrate a controlled, substantial reduction of entrapped DNAPL in both two- and three-dimensional heterogeneous domains, using less than a single pore volume of flushing solution in some cases.
ISSN:0013-936X
1520-5851
DOI:10.1021/es001891d