2000, "Biologically Enhanced Dissolution of Tetrachloroethene DNAPL
Field and laboratory evaluation of the treatment of DNAPL
source zones using emulsified zero-valent iron.
For the last few years, crews have been removing 75 to 100 gallons of DNAPL
every month, and the cleanup will continue indefinitely.
We now know that spatial variability in DNAPL
mass distribution within a source region is almost inevitable, and, consequently, that mass detection is extremely difficult and uncertain [e.
migration, hysteretic capillary forces cause retention of a portion of the liquid within the pores as discontinuous globules or ganglia [Lenhard et al.
Co-solvent flushing, also known as in situ flushing, is a technology that has recently been considered for removal of light and dense nonaqueous phase liquids (LNAPLs and DNAPLs
, respectively) from groundwater aquifers.
Our conference will review the latest developments in dealing with significant regional problems with MTBE contamination, as well as DNAPLs
and other threats to ground water.
The use of the UPLC/MS[TM] method demonstrates that VeruSOL-3TM serves its purpose to emulsify MGP DNAPL
in a controlled and efficient manner, but is also destroyed along with the volatile and semi-volatile compounds present in the MGP coal tar during the chemical oxidation process.
Prior to issuing the proposed amendment, EPA considered four clean-up alternatives for the DNAPL
(dense non aqueous phase liquid) source areas of the site.
This application builds on iron-clay liner research at the University of Waterloo (Major, 1999), and ZVI-clay DNAPL
research at the University of Waterloo and Colorado State University (Wadley & Gillham, 2005, Schackleford et al 2005), which has shown that small percentages of iron mixed with clay can significantly reduce the mass flux of chlorinated organic contaminants (and presumably certain inorganic contaminants) through thin clay layers.
OTC Bulletin Board: IWTID) was selected by the Interagency DNAPL
Consortium -- combining the interests of NASA, the Departments of Defense and Energy, and the US EPA -- to design removal of the solvent TCE from a contaminated aquifer at Cape Canaveral Launch Complex 34.
Kevin Warner, Robert Cowdery, and Randy Sillan from LFR's Tallahassee office will present a paper on "Remediation of DNAPL
PCE with In Situ Cosolvent Flushing.