Cr(VI) reduction data obtained with three bacterial species (Escherichia coli ATCC 33456, Bacillus sp., Pseudomonas fluorescens LB 300) were analyzed using an enzyme-based kinetic model. The model was developed by incorporating enzyme kinetics and a finite Cr(VI) reduction capacity to illustrate toxic effects of Cr(VI). The model was also used to analyze Cr(VI) reduction data taken from the literature for two other Cr(VI)-reducing species (Desulfovibrio vulgaris ATCC 29579, and Pseudomonas ambigua G-1). Although four different genera of bacteria were involved, the model was found to be capable of describing Cr(VI) reduction. The finite capacity indicates the maximum amount of Cr(VI) that a batch culture can reduce and it was explicitly demonstrated regardless of subsequent cell growth. The lost of Cr(VI) reduction capacity in bacterial cells may be attributed to the mutagenic and toxic-effects of Cr(VI). The batch cultures reduced Cr(VI) at rates which decreased progressively with the-amount of Cr(VI) reduced. Cr(VI) reduction ceased whenever the maximum capacity was reached.
|Number of pages||6|
|State||Published - Apr 1997|
Bibliographical noteFunding Information:
Acknowledgement--This research was supported by a U.S.EPA exploratory research grant awarded to Yi-Tin Wang under agreement No. R-822307-01-0.
Copyright 2020 Elsevier B.V., All rights reserved.
- Bacillus sp
- Escherichia coli
- Finite reduction capacity
- Pseudomonas fluorescens
ASJC Scopus subject areas
- Ecological Modeling
- Water Science and Technology
- Waste Management and Disposal