While corn stover might be the big talk recently in the cellulosic ethanol game, sorghum could emerge as an alternative to the feedstock for the advanced green fuel. During the recent American Seed Trade Association CSS 2014 and Seed Expo in Chicago, Leah Guffey caught up with Scott Staggenborg of Chromatin, a sorghum genetics company, and they talked about using sorghum for cellulosic ethanol.
“People forget that many of sorghum’s original uses were for animal feed, so biomass yield is important and digestability is important,” said Staggenborg. “So if you think about cellulosic ethanol production, it’s just really a big, steel or concrete digester, rather than a four-legged digester.”
He went on to say that with the 40,000 varieties of sorghum availability, his company is taking advantage of traditional breeding and modern molecular methods to get the most out of sorghum, especially for cellulosic biofuels. One of the breeds he points to as having great potential for biofuels is sweet sorghum, which he compares to an annual sugarcane, except sorghum has to re-established each year from seed.
“It’s high biomass, and it has high juice yields, as well as high sugar yields,” Staggenborg explained. “Those three combined result in high sugar yields per acre, and that’s the goal of our breeding program, as well as altering the composition of the sugar itself.”
He added that the Renewable Fuels Standard is a big driver in making sure there is a market for sorghum-based, or any other feedstock-based, cellulosic biofuel.
“The RFS establishes a market, establishes a need, sort of primes the pump for the demand, until it becomes something that widely available, although it’s already widely accepted, and allows a fledgling industry to move forward.”
You can hear all of Leah’s interview with Scott here: Scott Staggenborg, Chromatin