Fungus Improves the Efficiency of Ethanol Processing

Renewable Energy World.com
by Mike Krapfl
Iowa, United States [RenewableEnergyWorld.com]

Growing a fungus in some of the leftovers from ethanol production can save energy, recycle more water and improve the livestock feed that is a co-product of fuel production, according to a team of researchers from Iowa State University and the University of Hawai'i.

"The process could change ethanol production in dry-grind plants so much that energy costs can be reduced by as much as one-third," said Hans van Leeuwen, an Iowa State professor of civil, construction and environmental engineering and the leader of the research project.

The project is focused on using fungi to clean up and improve the dry-grind ethanol production process. That process grinds corn kernels and adds water and enzymes. The enzymes break the starches into sugars. The sugars are fermented with yeasts to produce ethanol.

The fuel is recovered by distillation, but there are about six gallons of leftovers for every gallon of fuel that's produced. Those leftovers, known as stillage, contain solids and other organic material. Most of the solids are removed by centrifugation and dried into distillers dried grains that are sold as livestock feed, primarily for cattle.

Read the full story