Microbial ecology meets electrochemistry: electricity-driven and driving communities

Area of Science:

• Environmental biotechnology
• Microbial electrochemistry
• Biogeochemical cycles

Background:

• Bio-electrochemical systems (BESs) utilize bacteria's interaction with electrodes via electron transfer.
• Microbial fuel cells (MFCs) are a key BES type, generating power from electron donors in wastewater.
• Extracellular electron transfer is crucial in global biogeochemical cycles, involving various bacteria.

Purpose of the Study:

• To review recent breakthroughs in BESs and extracellular electron transfer.
• To elucidate the mechanisms of bacterial external electron shuttling.
• To explore the potential of BESs in simulating and improving environmental processes.

Main Methods:

• Utilizing BESs to study bacterial electron transfer mechanisms.
• Investigating microbial communities and their cooperative energy generation.
• Simulating and analyzing novel environmental processes within BESs.

Main Results:

• Demonstrated the widespread nature of extracellular electron transfer across diverse bacteria.
• Discovered new cooperative interactions within microbial communities for energy generation.
• Enabled simulation and improvement of previously difficult-to-study environmental processes.

Conclusions:

• BESs are foundational to a new environmental biotechnology due to their versatility and control.
• Further research is needed, as many questions remain unanswered despite rapid progress.
• BESs show significant promise for applications in natural environments and mixed microbial communities.