Kinetic studies of phenol degradation by Rhodococcus sp. P1. II. Continuous cultivation.

Area of Science:

• Microbial degradation
• Biotechnology
• Environmental microbiology

Background:

• Phenol is a common industrial pollutant.
• Microbial degradation offers a sustainable remediation solution.
• Rhodococcus sp. are known for their metabolic versatility.

Purpose of the Study:

• To investigate the phenol degradation capabilities of Rhodococcus sp. P1.
• To determine the optimal conditions for phenol biodegradation in continuous culture.
• To assess the tolerance of Rhodococcus sp. P1 to high phenol concentrations and co-substrates.

Main Methods:

• Continuous culture bioreactor experiments.
• Gradual adaptation of Rhodococcus sp. P1 to increasing phenol concentrations.
• Monitoring of degradation rates and system stability under varying conditions.

Main Results:

• Rhodococcus sp. P1 adapted to phenol concentrations up to 30 g/L.
• Achieved high degradation rates of approximately 0.3 g/g dry mass/h.
• Demonstrated tolerance to step increases in phenol and co-substrates like catechol.
• System stability was inversely related to dilution rate and inlet phenol concentration.

Conclusions:

• Rhodococcus sp. P1 is a robust candidate for phenol bioremediation.
• Adaptation strategies are crucial for high-concentration phenol degradation.
• Operational parameters significantly influence the stability of the biodegradation system.