Use of a tapered fluidized bed as a continuous bioreactor

Area of Science:

• Bioprocess Engineering
• Chemical Engineering
• Biotechnology

Background:

• Fluidized bed reactors are crucial for bioprocesses utilizing immobilized or adhering microorganisms.
• Traditional fluidized beds can face challenges like biomass buildup and limited operating conditions.
• Tapered reactor designs offer potential solutions to enhance fluidized bed stability and performance.

Purpose of the Study:

• To develop and evaluate reactor systems based on tapered fluidized beds for aqueous bioprocesses.
• To investigate the stabilizing effect of a tapered geometry on fluidized bed bioreactors.
• To assess the applicability of tapered fluidized bed bioreactors in various bioprocesses.

Main Methods:

• Development of reactor systems utilizing tapered fluidized beds.
• Conducting preliminary experiments to evaluate reactor performance.
• Developing an empirical mathematical model to understand bed dynamics.
• Utilizing enzyme-catalyzed conversion of lactose as a model bioprocess.

Main Results:

• The tapered reactor design enhances fluidized bed stability, allowing a wider range of operating conditions.
• Bed stability is linked to decreasing velocity and void-fraction profiles up the bed.
• Pressure drop across the bed decreases with increasing flow rates.
• The system demonstrated potential in enzymatic production of hydrogen and waste stream degradation.

Conclusions:

• Tapered fluidized bed bioreactors provide a stable and versatile platform for aqueous bioprocesses.
• The reactor design effectively manages biomass and particulates, simplifying operations.
• Further evaluation is warranted for applications in hydrogen production, denitrification, and waste treatment.