Modeling simultaneous hexavalent chromium reduction and phenol degradation by a defined coculture of bacteria
- Univ. of Kentucky, Lexington, KY (United States). Dept. of Civil Engineering
Based on the kinetics of Cr(VI) reduction by Escherichia coli ATCC 33456 and phenol degradation by Pseudomonas putida DMP-1, a mathematical model is developed to describe simultaneous Cr(VI) reduction and phenol degradation in the coculture of the two species. The developed model incorporates the toxicity effects of Cr(VI) and phenol on phenol degradation and Cr(VI) reduction in the coculture. The model illustrates the inhibitory effects of phenol on Cr(VI) reduction and Cr(VI) toxicity toward phenol degradation. The model also reveals the recoveries of the activities of the repressed bacterial cells with continuous Cr(VI) reduction and phenol degradation in the coculture. The model is capable of predicting simultaneous Cr(VI) reduction and phenol degradation within a broad range of Cr(VI) and phenol concentrations and under an appropriate composition of populations. However, the model simulates lower concentrations of phenol than experimental observations once Cr(VI) is reduced to a low level (< 7 mg/L). The model simulation for Cr(VI) also deviates from experimental data when P. putida is outnumbered by E. coli by a ratio of 1:5.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 162985
- Journal Information:
- Biotechnology and Bioengineering, Vol. 48, Issue 6; Other Information: PBD: 20 Dec 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cr(VI) reduction in continuous-flow coculture bioreactor
Hexavalent chromium removal in two-stage bioreactor system