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Kinetic studies of phenol degradation by Rhodococcus sp. P1. I. Batch cultivation
G Straube1, J Hensel, C Niedan
1Technical University Carl Schorlemmer Leuna-Merseburg, Merseburg, GDR.
Antonie Van Leeuwenhoek
|January 1, 1990
Summary
Rhodococcus sp. P1 efficiently degrades phenol using the beta-ketoadipate pathway. However, high phenol concentrations (above 0.25 g/L) inhibit microbial growth, necessitating kinetic modeling for optimal bioreactor design.
Area of Science:
- Microbiology
- Biotechnology
- Environmental Science
Background:
- Phenol is a common industrial pollutant and a potential carbon source for microbial degradation.
- Rhodococcus sp. P1 is known to metabolize aromatic compounds.
- Understanding the kinetics of phenol degradation is crucial for bioremediation and industrial applications.
Purpose of the Study:
- To investigate the degradation of phenol by Rhodococcus sp. P1.
- To determine the optimal conditions for phenol utilization.
- To characterize substrate inhibition kinetics.
Main Methods:
- Batch cultivation of Rhodococcus sp. P1 with phenol as the sole carbon source.
- Measurement of cell growth and substrate concentration over time.
- Kinetic analysis to model phenol inhibition.
Main Results:
- Rhodococcus sp. P1 degraded phenol concentrations up to 2.8 g/L.
- Optimal specific growth rate (0.32 h-1) was observed at 0.25 g/L phenol.
- Substrate inhibition occurred at higher phenol concentrations, increasing lag phase and reducing growth rates.
Conclusions:
- Rhodococcus sp. P1 effectively utilizes phenol but is subject to substrate inhibition.
- A mathematical model was developed to describe phenol inhibition kinetics.
- These findings are valuable for optimizing bioreactor performance in phenol treatment processes.