Biological removal of the xenobiotic trichloroethylene (TCE) through cometabolism in nitrifying systems
In the present study, cometabolic TCE degradation was evaluated using NH 4–N as the growth-substrate. At initial TCE concentrations up to 845 μg/L, TCE degradation followed first-order kinetics. The increase in ammonium utilization rate favored the degradation of TCE. This ensured that biological tr...
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Published in | Bioresource technology Vol. 101; no. 1; pp. 430 - 433 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Kidlington
Elsevier Ltd
2010
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | In the present study, cometabolic TCE degradation was evaluated using NH
4–N as the growth-substrate. At initial TCE concentrations up to 845
μg/L, TCE degradation followed first-order kinetics. The increase in ammonium utilization rate favored the degradation of TCE. This ensured that biological transformation of TCE in nitrifying systems is accomplished through a cometabolic pathway by the catalysis of non-specific ammonia oxygenase enzyme of nitrifiers. The transformation yield (
T
y
) of TCE, the amount of TCE degraded per unit mass of NH
4–N, strongly depended on the initial NH
4–N and TCE concentrations. In order to allow a rough estimation of TCE removal and nitrification at different influent TCE and NH
4–N concentrations, a linear relationship was developed between 1/
T
y
and the initial NH
4–N/TCE ratio. The estimated
T
y
values lead to the conclusion that nitrifying systems are promising candidates for biological removal of TCE through cometabolism. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0960-8524 1873-2976 |
DOI: | 10.1016/j.biortech.2009.07.079 |