EPA 540/R-95/529a
Ex-Situ Anaerobic Bioremediation System: TNT
J. R. Simplot Company
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Ex-Situ Anaerobic Bioremediation System: TNT
J. R. Simplot Company (65K)
ABSTRACT
Ex-Situ Anaerobic Bioremediation System: TNT
J. R. Simplot Company
SITE Technology Capsule
EPA 540/R-95/529a
September 1995
J.R. Simplot's patented Ex-Situ Anaerobic Biological Remediation System is designed
to destroy nitroaromatic and energetic compounds in contaminated soils with
total destruction of toxic intermediate through enhancement of naturally selected
anaerobic soil microorganisms. Treatment occurs in a bioreactor, where the contaminated
soil is mixed into a slurry through the addition of water, a phosphate buffer
and a carbon source. A nitroaromatic-degrading consortium of anaerobic bacteria
is also added to the bioreactor. Anaerobic conditions are quickly established,
allowing the bacteria to degrade target compounds while preventing polymerization
of intermediate breakdown products. An evaluation of this technology was conducted
on 30 yd3 of 2,4,6-trinotro-toluene (TNT) contaminated soil at the Weldon Spring
Ordnance Works (WSOW) in Weldon Spring, Missouri. The demonstration was conducted
over the 1993 winter. During the demonstration TNT was reduced from average
concentrations of 1,500 ppm to an average of 8.7 ppm resulting in a reduction
efficiency of 99.4 percent. Toxicity testing showed that the soil toxicity was
also significantly reduced. The Weldon Spring demonstration showed the effectiveness
of this process even under unfavorable winter conditions. Treatment costs have
been estimated to be approximately $112/yd3.
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Posted February 26, 1999
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