TY - JOUR
T1 - Reduction of hydraulic conductivity and reactivity in zero-valent iron columns by oxygen and TNT
AU - Johnson, R. L.
AU - Tratnyek, P. G.
AU - Miehr, R.
AU - Thoms, R. B.
AU - Bandstra, J. Z.
PY - 2005
Y1 - 2005
N2 - 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 ksa 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 ksa, while dissolved oxygen appears to have relatively little impact on the reactivity of the columns toward TNT.
AB - 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 ksa 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 ksa, while dissolved oxygen appears to have relatively little impact on the reactivity of the columns toward TNT.
UR - http://www.scopus.com/inward/record.url?scp=27744458975&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=27744458975&partnerID=8YFLogxK
U2 - 10.1111/j.1745-6592.2005.0008.x
DO - 10.1111/j.1745-6592.2005.0008.x
M3 - Article
AN - SCOPUS:27744458975
SN - 1069-3629
VL - 25
SP - 129
EP - 136
JO - Ground Water Monitoring and Remediation
JF - Ground Water Monitoring and Remediation
IS - 1
ER -