Publication Date:
2015-07-16
Description:
Two-parameter continuation and bifurcation analysis strategies were applied to deal with the oscillatory phenomena of a Zymomonas mobilis ethanol fermentation system. A structured verified non-linear mathematical model considering the physiological limitations of microorganisms for a single continuous fermenter for ethanol production using Z. mobilis was built to identify the Hopf bifurcation (HB) points, which indicate the oscillatory behavior, using the inlet substrate concentration and the dilution rate as bifurcation parameters. The path of the HB points can be determined with different controlling operating parameters. It was found that with the addition of a small amount of cells or ethanol to the feed stream or by increasing the dilution rate, the oscillations could be eliminated and steady-state behavior was attained. Using a two-parameter continuation strategy, the Z. mobilis fermentation system could operate at steady state without oscillatory behavior. Two-parameter continuation and bifurcation analysis strategies were applied to control the oscillatory behavior of a Z. mobilis ethanol fermentation system. A mathematical model was built to identify the Hopf bifurcation points indicating the oscillatory behavior. The oscillations could be eliminated by adding small amounts of cells or ethanol to the feed stream or by increasing the dilution rate.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
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