Anode Surface Bioaugmentation Enhances Deterministic Biofilm Assembly in Microbial Fuel Cells

Area of Science:

• Environmental Microbiology
• Bioelectrochemistry
• Sustainable Energy

Background:

• Microbial fuel cells (MFCs) utilize electroactive biofilms for waste biodegradation and energy generation.
• Efficient MFC performance relies on metabolic cooperation within anode biofilms, particularly during early colonization.
• Optimizing anode biofilm assembly is crucial for reducing MFC startup times and enhancing sustainability.

Purpose of the Study:

• To investigate ecological processes driving anode biofilm assembly in MFCs.
• To evaluate the impact of bioaugmentation and wastewater inoculation on MFC startup and performance.
• To identify strategies for robust and efficient microbial community management in MFCs.

Main Methods:

• Metagenomic analysis of anode biofilm communities.
• Comparison of bioaugmented and untreated anode surfaces.
• Assessment of current density generation under different inoculation strategies.

Main Results:

• Bioaugmentation with a defined electroactive consortium accelerated current generation.
• Untreated anodes exhibited stochastic and slower biofilm assembly.
• Wastewater inoculation, combined with bioaugmentation, led to efficient colonization by specific species (e.g., *Geobacter lovleyi*), enhancing functionality.

Conclusions:

• Anode surface pretreatment alone is insufficient for significantly improving MFC startup times.
• The combination of bioaugmentation and wastewater inoculation provides an optimized strategy for rapid and functional anode biofilm establishment.
• This approach mitigates stochasticity, promoting the growth of beneficial species for enhanced MFC performance.