Anaerobic biotransformation of 2,4-dinitrotoluene with ethanol, methanol, acetic acid and hydrogen as primary substrates

The anaerobic reduction of 2,4-dinitrotoluene (DNT) to 2,4-diaminotoluene (DAT) was studied in an anaerobic respirometer using ethanol, methanol, acetic acid or hydrogen as primary substrates. No biotransformation occurred in the absence of a primary substrate. The reduction pathway involved 4-amino...

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Bibliographic Details
Published in:Water research (Oxford) 1998-10, Vol.32 (10), p.2921-2930
Main Authors: JIAYANG CHENG, SUIDAN, M. T, VENOSA, A. D
Format: Article
Language:English
Subjects:
Biodegradation of pollutants
Biological and medical sciences
Biotechnology
Environment and pollution
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
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Summary:The anaerobic reduction of 2,4-dinitrotoluene (DNT) to 2,4-diaminotoluene (DAT) was studied in an anaerobic respirometer using ethanol, methanol, acetic acid or hydrogen as primary substrates. No biotransformation occurred in the absence of a primary substrate. The reduction pathway involved 4-amino-2-nitrotoluene or 2-amino-4-nitrotoluene. The rate of DNT reduction was greatest with ethanol as the primary substrate. When hydrogen was the primary substrate, cultures produced in an ethanol-enriched environment gave the fastest reduction rates compared with methanol- and acetate-enriched cultures. DNT was not completely transformed to DAT unless enough ethanol was initially added to produce at least twice the hydrogen stoichiometrically needed for the process. A high concentration of ethanol accelerated the reduction. DNT and the amino-nitrotoluenes inhibited the methanogenesis of methanol, acetate and hydrogen.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(98)00089-X