HR: 11:10h
AN: H22A-04 INVITED     [Abstracts]
TI: Brine-Based Approaches for Remediating DNAPL-Contaminated Subsurface Systems
AU: * Miller, C T
EM: casey_miller@unc.edu
AF: University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, NC 27599-7431 United States
AU: Johnson, D N
EM: nomad12@email.unc.edu
AF: University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, NC 27599-7431 United States
AU: Pedit, J A
EM: pedit@email.unc.edu
AF: University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, NC 27599-7431 United States
AU: Sanderson, P M
EM: psanders@email.unc.edu
AF: University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, NC 27599-7431 United States
AU: Birak, P S
EM: birak@email.unc.edu
AF: University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, NC 27599-7431 United States
AU: Murphy, L L
EM: llmurphy@email.unc.edu
AF: University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, NC 27599-7431 United States
AB: The effective and efficient remediation of subsurface systems that have been contaminated by dense nonaqueous phase liquids (DNAPLs) remains as an important challenge in hydrology. This challenge is influenced by mass transfer limitations, heterogeneity of subsurface environments, complex phase behavior, fluid instabilities, and density gradients that influence flow behavior. We show results from a set of laboratory experiments designed to investigate a set of technologies that rely upon dense brines to control the movement of DNAPLs that are originally trapped in the pore structure of a porous medium. We show that in certain situations variants of these technologies can provide effective and efficient removal of more than 80% of the DNAPL originally present in the system. Further we demonstrate combinations of technologies that have been found to provide near-complete removal of residual DNAPL originally trapped in a heterogeneous, three-dimensional systems. This success notwithstanding, several open issues remain, which we outline and discuss.
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: Fall Meeting 2005