Electrofuel Production Using Ammonia or Iron as Redox Mediators in Reverse Microbial Fuel Cells

Originally delivered May 29, 2012
  • Type:
    Archived Webinar
  • Level:
  • PDHs:

Share This Post:

The production of electrofuels requires the efficient transport of electrons from an electrochemical system into a biological system.  We have approached this challenge by identifying natural chemical mediators that

  1. can be easily reduced electrochemically and
  2. are natural substrates for different bacterial strains, thus eliminating the need to engineer this aspect of primary metabolism in the biological hosts. 

In our first project we have constructed a reverse microbial fuel cell using the ammonia oxidizing bacteria, N. europaea. These cells grow planktonically and they efficiently oxidize ammonia to nitrite while fixing carbon dioxide.  We have developed an electrochemical reactor to reduce the nitrite back to ammonia so that we are producing biomass from electricity and air.  We have recently engineered the N. europaea cells to produce isobutanol, which is a transportation infrastructure compatible biofuel. 

In a second project we are working with A. ferrooxidans, which is an iron oxidizing bacteria used in biomining operations.  The oxidized iron can be readily reduced electrochemically, and efforts are underway to engineer these cells to make isobutanol as well.  As these processes are developed and optimized, they may be able to produce biofuels and other petroleum derived chemicals from electricity and air.


Scott Banta

Our research focuses on applying protein engineering and metabolic engineering tools to solve a variety of important problems in bioengineering. Protein engineering involves the modification of proteins and peptides in order to produce new molecules with novel traits or functions. Metabolic engineering refers to the characterization and improvement of networks of enzymes to obtain desired new goals. These pursuits can be used to bring about new solutions to problems in biotechnology, nanotechnology, biomedical engineering, bioprocess engineering, and drug discovery.

One of our...Read more

Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits. If you have already viewed this content, please click here to login.



Do you already own this?

Log In for instructions on accessing this content.


AIChE Member Credits 1
AIChE Members $69.00
AIChE Undergraduate Student Members Free
AIChE Graduate Student Members Free
SBE Members Free
Non-Members $99.00
Webinar content is available with the kind permission of the author(s) solely for the purpose of furthering AIChE’s mission to educate, inform and improve the practice of professional chemical engineering. All other uses are forbidden without the express consent of the author(s).