Most corn ethanol plants in the U.S. are dry
grind facilities (USGC, 2012). One disadvantage of dry grind process is that
the value of DDGS has decreased due to an increase in dry grind facilities.
Thus, modified dry grind facilities have been proposed to recover germ and
fiber from the corn grains and improve byproduct value (Rodríguez et al.,
2010). The cost efficiency of ethanol production from food based feedstocks
and impacts on change in land usage has been criticized (Rathmann et al.,
2010). Such drawbacks of first generation bioethanol gave rise to the need for
ethanol production from non-food based feedstocks such as biomass.