Carbon tetrachloride product shift in a methanogenic, iron-containing system

E. J. Andrews, Paige J Novak

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The transformation of carbon tetrachloride (CT) by Methanosarcina thermophila can be affected by the presence of elemental iron (Fe0). The transformation of CT by M. thermophila grown in the presence and absence of Fe0 (P and A, respectively) was investigated using 14C-CT. In P and A treatments, the main degradation products were chloroform (CF) and CO2. The P treatment produced greater amounts of CF, but degraded it at a higher rate than the A treatment. Products were identified to determine if degradation occurred via hydrogenolysis, generating CF and dichloromethane, or hydrolytic reduction, generating CO. The presence of Fe0 reduces the extent to which CT is degraded by hydrolytic reduction. The greater amounts of CF and the lesser amounts of CO and CO2 produced by systems pre-exposed to Fe0 suggest that Fe0 creates conditions that lead to more hydrogenolysis of CT than occurs in systems without pre-exposure to Fe0.

Original languageEnglish (US)
JournalBattelle Memorial Institute International In Situ and On-Site Bioreclamation Symposium Proceedings
StatePublished - Dec 1 1999


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