Transformation of 1,1,1-trichloroethane in an anaerobic packed-bed reactor at various concentrations of 1,1,1-trichloroethane, acetate and sulfate |
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| Authors: | J H de Best H Jongema A Weijling H J Doddema D B Janssen W Harder |
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| Institution: | (1) TNO Environmental Technology and Process Engineering Division, Department of Environmental Biotechnology, P.O. Box 342, 7300 AH Apeldoorn, The Netherlands Tel.: + 31 55-5493096 Fax: + 31 55-5493410, NL;(2) Department of Biochemistry, University of Groningen, Groningen, The Netherlands, NL |
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| Abstract: | Biotransformation of 1,1,1-trichloroethane (CH3CCl3) was observed in an anaerobic packed-bed reactor under conditions of both sulfate reduction and methanogenesis. Acetate (1 mM)
served as an electron donor. CH3CCl3 was completely converted up to the highest investigated concentration of 10 μM. 1,1-Dichloroethane and chloroethane were
found to be the main transformation products. A fraction of the CH3CCl3 was completely dechlorinated via an unknown pathway. The rate of transformation and the transformation products formed depended
on the concentrations of CH3CCl3, acetate and sulfate. With an increase in sulfate and CH3CCl3 concentrations and a decrease in acetate concentration, the degree of CH3CCl3 dechlorination decreased. Both packed-bed reactor studies and batch experiments with bromoethanesulfonic acid, an inhibitor
of methanogenesis, demonstrated the involvement of methanogens in CH3CCl3 transformation. Batch experiments with molybdate showed that sulfate-reducing bacteria in the packed-bed reactor were also
able to transform CH3CCl3. However, packed-bed reactor experiments indicated that sulfate reducers only had a minor contribution to the overall transformation
in the packed-bed reactor.
Received: 22 January 1997 / Received revision: 12 May 1997 / Accepted: 19 May 1997 |
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