Fermentation of Carbon Dioxide to Ethanol

Sustainable Engineering Forum
2011 AIChE Annual Meeting
AIChE Annual Meeting
October 16, 2011 - 8:00pm

Many fermentation processes have been used to convert biomass to various fuels. Syngas, which is a mixture of CO, CO2, and H2, is one process being studied for the production of ethanol. Per mole of ethanol produced, 12 electrons are consumed. H2 and CO are the electron sources in syngas fermentation. One issue involved in syngas fermentation is the production of waste CO2. In this study, using CO2 as sole feed gas, an external electron source is utilized to create additional ethanol. Electrons were created by an external power source using a Bio Electrical Anaerobic Reactor (BEAR). An electron mediator, such as methyl viologen (MV) used in this study, is also a requirement since cells cannot direct use electrons from the power source efficiently. The characteristics of the three MV oxidation states are important issues in CO2 fermentation. These characteristics include oxidation state distribution under different induced potentials, toxicity to cell growth, and the ability to transfer electrons. These characteristics are important not only because they affect the activity of enzymes involved in the metabolic pathway, but also because they influence the synthesis of intermediates and product. Therefore, it is critical to learn how MV can function for cell growth and product formation. Results from experimentation of these important characteristics of MV and a discussion of its application as a suitable external electron source are presented.
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access
Related Topics: