Phenol biodegradation in a batch jet loop bioreactor (JLB): kinetics study and pH variation

Area of Science:

• Environmental microbiology
• Biochemical engineering

Background:

• Phenol is a common industrial pollutant.
• Effective bioremediation strategies are crucial for environmental protection.

Purpose of the Study:

• To investigate phenol biodegradation using activated sludge in a batch jet loop bioreactor (JLB).
• To compare the JLB's efficiency with other bioreactor types.
• To model the biodegradation kinetics using the Haldane equation.

Main Methods:

• Batch biodegradation experiments were conducted in a JLB with varying initial phenol concentrations (50–1000 mg/l).
• The Haldane equation was used to model the relationship between specific growth rates and initial phenol concentrations.
• Model simulations were performed using MATHCAD 7.0.

Main Results:

• The JLB achieved complete (100%) phenol removal.
• The JLB demonstrated higher biodegradation capacity compared to reported stirred tank reactors.
• Kinetic constants were determined: µm = 0.119 1/h, Ks = 11.13 mg/l, and Ki = 250.88 mg/l.

Conclusions:

• Jet loop bioreactors are highly effective for phenol biodegradation.
• The Haldane model provides an accurate description of phenol biodegradation kinetics in the JLB.
• This study offers valuable insights for designing efficient phenol wastewater treatment systems.