Reduction of hydraulic conductivity and reactivity in zero-valent iron columns by oxygen and TNT

Richard Johnson, Paul Tratnyek, R. Miehr, R. B. Thoms, J. Z. Bandstra

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The degradation of 2,4,6-trinitrotoluene (TNT) and other explosives by zero-valent iron (ZVI) is rapid and, as a result, potentially useful for both ex situ ground water "pump-and-treat" systems and in situ permeable reactive barriers. However, the usefulness of ZVI in either configuration may be limited by reaction-induced reduction in both hydraulic conductivity (K) and reactivity (as represented by the surface area-normalized rate constant, k sa). The impacts of dissolved oxygen and TNT on K and k sa are examined here using field and laboratory columns. The data suggest that K reduction in ZVI columns can be significant when dissolved oxygen is present. However, when TNT is present at approximately the same concentration (10 mg/L), it does not cause significant reduction in K. In contrast, TNT causes a significant reduction in k sa, while dissolved oxygen appears to have relatively little impact on the reactivity of the columns toward TNT.

Original languageEnglish (US)
Pages (from-to)129-136
Number of pages8
JournalGround Water Monitoring and Remediation
Volume25
Issue number1
StatePublished - Dec 2005

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trinitrotoluene
Hydraulic conductivity
hydraulic conductivity
Dissolved oxygen
Iron
iron
oxygen
Oxygen
dissolved oxygen
pump and treat
reactive barrier
Groundwater
Rate constants
Pumps
explosive
Degradation
surface area
degradation
groundwater

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Reduction of hydraulic conductivity and reactivity in zero-valent iron columns by oxygen and TNT. / Johnson, Richard; Tratnyek, Paul; Miehr, R.; Thoms, R. B.; Bandstra, J. Z.

In: Ground Water Monitoring and Remediation, Vol. 25, No. 1, 12.2005, p. 129-136.

Research output: Contribution to journalArticle

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