Anodic and cathodic microbial communities in single chamber microbial fuel cells

Area of Science:

• Microbiology
• Electrochemistry
• Environmental Science

Background:

• Microbial fuel cells (MFCs) offer a sustainable method for energy generation from organic waste.
• Extracellular electron transfer (EET) by microbial biofilms is crucial for MFC performance.
• Understanding microbial community dynamics is key to optimizing MFC efficiency.

Purpose of the Study:

• To characterize the microbial communities in a Single Chamber Microbial Fuel Cell (SCMFC) fed with acetate.
• To investigate the microbial basis of anodic and cathodic extracellular electron transfer (EET).
• To identify dominant bacterial genera and families within the MFC biofilms.

Main Methods:

• Utilized a Single Chamber Microbial Fuel Cell (SCMFC) with acetate as the substrate.
• Inoculated the MFC with biogas digestate.
• Performed taxonomic characterization using Illumina sequencing of the 16S rRNA gene.

Main Results:

• Geovibrio genus and purple non-sulfur (PNS) bacteria were dominant in the anodic biofilm.
• Nitrincola genus and Porphyromonadaceae family were the most abundant in the cathodic biofilm.
• Distinct microbial communities were observed at the anode and cathode.

Conclusions:

• The study identified key microbial players in acetate-fed SCMFCs.
• Specific bacterial groups are associated with anodic and cathodic EET processes.
• Findings contribute to a deeper understanding of MFC microbial ecology and function.