Remediation of NAPL source zones: Lessons learned from field studies at Hill and Dover AFB

John E. McCray, Geoffrey R. Tick, James W. Jawitz, John S. Gierke, Mark L Brusseau, Ronald W. Falta, Robert C. Knox, David A. Sabatini, Michael D. Annable, Jeffrey H. Harwell, A. Lynn Wood

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Innovative remediation studies were conducted between 1994 and 2004 at sites contaminated by nonaqueous phase liquids (NAPLs) at Hill and Dover AFB, and included technologies that mobilize, solubilize, and volatilize NAPL: air sparging (AS), surfactant flushing, cosolvent flooding, and flushing with a complexing-sugar solution. The experiments proved that aggressive remedial efforts tailored to the contaminant can remove more than 90% of the NAPL-phase contaminant mass. Site-characterization methods were tested as part of these field efforts, including partitioning tracer tests, biotracer tests, and mass-flux measurements. A significant reduction in the groundwater contaminant mass flux was achieved despite incomplete removal of the source. The effectiveness of soil, groundwater, and tracer based characterization methods may be site and technology specific. Employing multiple methods can improve characterization. The studies elucidated the importance of small-scale heterogeneities on remediation effectiveness, and fomented research on enhanced-delivery methods. Most contaminant removal occurs in hydraulically accessible zones, and complete removal is limited by contaminant mass stored in inaccessible zones. These studies illustrated the importance of understanding the fluid dynamics and interfacial behavior of injected fluids on remediation design and implementation. The importance of understanding the dynamics of NAPL-mixture dissolution and removal was highlighted. The results from these studies helped researchers better understand what processes and scales are most important to include in mathematical models used for design and data analysis. Finally, the work at these sites emphasized the importance and feasibility of recycling and reusing chemical agents, and enabled the implementation and success of follow-on full-scale efforts.

Original languageEnglish (US)
Pages (from-to)727-744
Number of pages18
JournalGround Water
Volume49
Issue number5
DOIs
StatePublished - Sep 2011

Fingerprint

nonaqueous phase liquid
Remediation
remediation
Impurities
pollutant
Liquids
flushing
Groundwater
Mass transfer
tracer
air sparging
groundwater
site characterization
fluid dynamics
flux measurement
Fluid dynamics
Sugars
surfactant
Recycling
sugar

ASJC Scopus subject areas

  • Water Science and Technology
  • Computers in Earth Sciences

Cite this

McCray, J. E., Tick, G. R., Jawitz, J. W., Gierke, J. S., Brusseau, M. L., Falta, R. W., ... Wood, A. L. (2011). Remediation of NAPL source zones: Lessons learned from field studies at Hill and Dover AFB. Ground Water, 49(5), 727-744. https://doi.org/10.1111/j.1745-6584.2010.00783.x

Remediation of NAPL source zones : Lessons learned from field studies at Hill and Dover AFB. / McCray, John E.; Tick, Geoffrey R.; Jawitz, James W.; Gierke, John S.; Brusseau, Mark L; Falta, Ronald W.; Knox, Robert C.; Sabatini, David A.; Annable, Michael D.; Harwell, Jeffrey H.; Wood, A. Lynn.

In: Ground Water, Vol. 49, No. 5, 09.2011, p. 727-744.

Research output: Contribution to journalArticle

McCray, JE, Tick, GR, Jawitz, JW, Gierke, JS, Brusseau, ML, Falta, RW, Knox, RC, Sabatini, DA, Annable, MD, Harwell, JH & Wood, AL 2011, 'Remediation of NAPL source zones: Lessons learned from field studies at Hill and Dover AFB', Ground Water, vol. 49, no. 5, pp. 727-744. https://doi.org/10.1111/j.1745-6584.2010.00783.x
McCray, John E. ; Tick, Geoffrey R. ; Jawitz, James W. ; Gierke, John S. ; Brusseau, Mark L ; Falta, Ronald W. ; Knox, Robert C. ; Sabatini, David A. ; Annable, Michael D. ; Harwell, Jeffrey H. ; Wood, A. Lynn. / Remediation of NAPL source zones : Lessons learned from field studies at Hill and Dover AFB. In: Ground Water. 2011 ; Vol. 49, No. 5. pp. 727-744.
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