Approximately 85% of the hazardous waste sites in the United States
have contaminated ground water. The conventional approach for
remediating contaminated ground water has been to extract the
contaminated water, treat it above ground, and reinject or
discharge the clean water in a process known as "pump-and-treat."
The recovered contaminants must be disposed of separately.
Pump-andtreat technologies require considerable investment over an
extended period of time, and it has been shown that these
technologies often do not actually remove the source of the
contamination. Current policies and laws stress "permanent"
remedies over simple containment methods. Consequently, there is
considerable interest in and effort being expended on alternative,
innovative treatment technologies for contaminated ground water.
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