Period biofilter operation for enhanced performance during unsteady-state loading conditions

Area of Science:

• Environmental biotechnology
• Bioreactor design
• Microbial ecology

Background:

• Conventional biofilters use continuous flow for gas-phase contaminant biotransformation.
• Challenges in biofilter design and operation include controlling microbial consortia and minimizing uncertainties.
• Periodic processes have been successfully applied in wastewater treatment and soil remediation.

Purpose of the Study:

• To describe the design and operation of biofilters as controlled unsteady-state, periodic processes.
• To demonstrate enhanced control over microbial communities within biofilters.
• To improve the destruction of gas-phase contaminants.

Main Methods:

• Designing and operating biofilters in a controlled unsteady-state, periodic manner.
• Utilizing polyurethane foam as a packing medium in toluene-degrading biofilters.
• Analyzing the impact of periodic operation on microbial physiology and spatial distribution.

Main Results:

• Controlled periodic operation allows for enhanced control of microbial consortia's physiological state and spatial distribution.
• This approach minimizes uncertainties associated with conventional biofilter design and operation.
• Demonstrated enhanced contaminant removal during transient periods of elevated contaminant load in toluene-degrading biofilters.

Conclusions:

• Controlled unsteady-state, periodic biofilter operation is a viable strategy for gas-phase contaminant destruction.
• This operational mode offers superior control over microbial communities compared to continuous processes.
• Periodic biofiltration enhances system robustness and efficiency, particularly under fluctuating contaminant loads.