Journal
WATER RESEARCH
Volume 40, Issue 17, Pages 3290-3296Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2006.06.035
Keywords
perchlorate; chlorate; hydrogen; biodegradation; kinetics; S-min; competitive inhibition
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This paper provides the first kinetic parameters for a hydrogen-oxidizing perchlorate-reducing bacterium (PCRB), Dechloromonas sp. PC1. The q(max) for perchlorate and chlorate were 3.1 and 6.3 mg/mgDW-day, respectively The K for perchlorate was 0.14mg/L, an order of magnitude lower than reported for other PCRB. The yields Y on perchlorate and chlorate were 0.23 and 0.22 mgDW/mg, respectively, and the decay constant b was 0.055/day The growth-threshold, S,in, for perchlorate was 14 mu g/L, suggesting that perchlorate cannot be reduced below this level when perchlorate is the primary electron-acceptor, although it may be possible when oxygen or nitrate is the primary acceptor. Chlorate accumulated at maximum concentrations of 0.6-4.3 mg/L in batch tests with initial perchlorate concentrations ranging from 100 to 600mg/L. Furthermore, 50mg/L chlorate inhibited perchlorate reduction with perchlorate at 100 mg/L. This is the first report of chlorate accumulation and inhibition for a pure culture of PCRB. These Chlorate effects are consistent with competitive inhibition between perchlorate and chlorate for the (per)chlorate reductase enzyme. (c) 2006 Elsevier Ltd. All rights reserved.
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