By Carl R. Woese Institute for Genomic Biology University of Illinois at Urbana-Champaign
Today many biofuel refineries operate for only seven months each year, turning freshly harvested crops into ethanol and biodiesel. When supplies run out, biorefineries shut down for the other five months. However, according to recent research, dual-purpose biofuel crops could produce both ethanol and biodiesel for nine months of the year – increasing profits by as much as 30 per cent.
“Currently, sugarcane and sweet sorghum produce sugar that may be converted to ethanol,” said co-lead author Stephen Long, Gutgsell Endowed Professor of Plant Biology and Crop Sciences at the Carl R. Woese Institute for Genomic Biology at the University of Illinois. “Our goal is to alter the plants’ metabolism so that it converts this sugar in the stem to oil – raising the levels in current cultivars from 0.05 per cent oil, not enough to convert to biodiesel, to the theoretical maximum of 20 per cent oil. With 20 per cent oil, the plant’s sugar stores used for ethanol production would be replaced with more valuable and energy dense oil used to produce biodiesel or jet fuel.”
A paper published in Industrial Biotechnology simulated the profitability of Plants Engineered to Replace Oil in Sugarcane and Sweet Sorghum (PETROSS) with 0 per cent, 5 per cent, 10 per cent, and 20 per cent oil. They found that growing sorghum in addition to sugarcane could keep biorefineries running for an additional two months, increasing production and revenue by 20-30 per cent. | READ MORE