An Assessment of Conventional in Situ Air Sparging Pilot Tests

Paul C. Johnson, Richard Johnson, Christopher Neaville, Erik E. Hansen, Steve M. Stearns, Ira J. Dortch

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Short-term (<24 h) pilot tests play a key role in the selection and design of in situ air sparging systems. During air injection, changes in dissolved oxygen in ground water, water levels in wells, soil gas pressures, and soil gas contaminant concentrations are measured. These parameters are assumed to be indicators of air sparging feasibility and performance. In this work we assess the validity of this critical assumption. Data are presented from a study site where a typical short-term test was conducted for three days, followed by continued operation of a full-scale system for 110 days. Conventional sampling practices were augmented with more discrete and detailed assessment methods. In addition, a tracer gas was used to better investigate air distributions, vapor flow paths, and vapor recovery efficiency. The data illustrate that conclusions regarding the performance and applicability of air sparging can vary dramatically depending on the monitoring approach used. Samples collected for chemical analyses from conventional monitoring wells were clearly affected by the air sparging during, and for some time after, air injection. Results from this site suggest that typical pilot test measurements might be useful for assessing infeasibility, but do not yield sufficient information to extrapolate to long-term performance.

Original languageEnglish (US)
Pages (from-to)765-774
Number of pages10
JournalGround Water
Volume35
Issue number5
StatePublished - Sep 1997

Fingerprint

air sparging
soil gas
Air
air
well
assessment method
monitoring
Gases
Vapors
dissolved oxygen
water level
Soils
tracer
Monitoring
Dissolved oxygen
Water levels
groundwater
in situ
test
pollutant

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Water Science and Technology

Cite this

Johnson, P. C., Johnson, R., Neaville, C., Hansen, E. E., Stearns, S. M., & Dortch, I. J. (1997). An Assessment of Conventional in Situ Air Sparging Pilot Tests. Ground Water, 35(5), 765-774.

An Assessment of Conventional in Situ Air Sparging Pilot Tests. / Johnson, Paul C.; Johnson, Richard; Neaville, Christopher; Hansen, Erik E.; Stearns, Steve M.; Dortch, Ira J.

In: Ground Water, Vol. 35, No. 5, 09.1997, p. 765-774.

Research output: Contribution to journalArticle

Johnson, PC, Johnson, R, Neaville, C, Hansen, EE, Stearns, SM & Dortch, IJ 1997, 'An Assessment of Conventional in Situ Air Sparging Pilot Tests', Ground Water, vol. 35, no. 5, pp. 765-774.
Johnson PC, Johnson R, Neaville C, Hansen EE, Stearns SM, Dortch IJ. An Assessment of Conventional in Situ Air Sparging Pilot Tests. Ground Water. 1997 Sep;35(5):765-774.
Johnson, Paul C. ; Johnson, Richard ; Neaville, Christopher ; Hansen, Erik E. ; Stearns, Steve M. ; Dortch, Ira J. / An Assessment of Conventional in Situ Air Sparging Pilot Tests. In: Ground Water. 1997 ; Vol. 35, No. 5. pp. 765-774.
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