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Applied and Environmental Microbiology, June 2005, p. 3355-3358, Vol. 71, No. 6
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.6.3355-3358.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Anaerobic Degradation of Benzene, Toluene, Ethylbenzene, and o-Xylene in Sediment-Free Iron-Reducing Enrichment Cultures

Michael K. Jahn,1,2 Stefan B. Haderlein,1 and Rainer U. Meckenstock1,3*

Lehrstuhl Umweltmineralogie, Zentrum für Angewandte Geowissenschaften, Eberhard-Karls-Universität Tübingen, Wilhelmstr. 56, D-72076 Tübingen, Germany,1 Tübinger Grundwasser-Forschungsinstitut, Institut für Geowissenschaften, Eberhard-Karls-Universität Tübingen, Sigwartstr. 10, D-72076 Tübingen, Germany,2 Institut für Grundwasserökologie, GSF-Forschungszentrum für Umwelt und Gesundheit, Ingolstädter Landstraße 1, D-85764 Neuherberg, Germany3

Received 30 August 2004/ Accepted 15 December 2004

Monoaromatic hydrocarbons such as benzene, toluene, ethylbenzene, and xylene (BTEX) are widespread contaminants in groundwater. We examined the anaerobic degradation of BTEX compounds with amorphous ferric oxide as electron acceptor. Successful enrichment cultures were obtained for all BTEX substrates both in the presence and absence of AQDS (9,10-anthraquinone-2,6-disulfonic acid). The electron balances showed a complete anaerobic oxidation of the aromatic compounds to CO2. This is the first report on the anaerobic degradation of o-xylene and ethylbenzene in sediment-free iron-reducing enrichment cultures.

* Corresponding author. Mailing address: Institut für Grundwasserökologie, GSF-Forschungszentrum für Umwelt und Gesundheit Ingolstädter Landstraße 1, D-85764 Neuherberg, Germany. Phone: 49 (0) 89/3187-2561. Fax: 49 (0) 89/3187-3361. E-mail: rainer.meckenstock{at}gsf.de.

Applied and Environmental Microbiology, June 2005, p. 3355-3358, Vol. 71, No. 6
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.6.3355-3358.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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