Termites Inspire New Cellulosic Ethanol Process
Termite + Cellulose = Biofuels!
Biofuel startup ZeaChem has begun building a biofuel pilot plant that will turn cellulosic feedstocks such as switch grass and wood chips into ethanol via a novel biomimetic process that uses microbes found in the guts of termites. It makes perfect sense to use the termite model to turn hard to digest cellulosic materials into simple sugars. Termintes have been happily munching wood millions of years. They have a proven process.
The company says the ethanol yields from the sugars of its cellulosic feedstocks are significantly higher than the yields from other biofuel production processes. ZeaChem says its process also has the potential to produce a plastic feedstock.
From Technology Review:
Bugging out: A pilot scale cellulose to ethanol plant is under construction by ZeaChem and partner Hazen Research in Golden, CO. The plant will soon pump out 250,000 gallons of fuel per year.
ZeaChem employs a hybrid approach that uses a combination of thermochemical and biological processes. It first uses acid to break the cellulose into sugars. Then, instead of fermenting the sugars into ethanol with yeast, as is typically done, the company feeds the sugars to an acetogen bacteria found in the guts of termites and other insects. The bacteria converts the sugar into acetic acid, which is then combined with hydrogen to form ethanol.
“It’s a little more complicated than a conventional process. It’s not the obvious, direct route, but there is a high yield potential,” says Jim McMillan of the U.S. Department of Energy’s National Renewable Energy Laboratory in Golden, CO.
In more conventional biofuel processes, much of the carbon content locked up in the sugars is lost to the formation of carbon dioxide when the sugars are fermented into ethanol. Converting the sugars into acetic acid and then ethanol, however, yields no carbon dioxide. As a result, this method has the potential to raise biofuel yields by as much as 50 percent, according to ZeaChem.
Via: Technology Review
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