The germ, pericarp fiber, and endosperm fiber can be recovered as coproducts in addition to ethanol and DDGS through dry-grinding ethanol process or a modified dry-grind process (E-Mill)
Removal of the suspended solids improves both the fermentation rate and ethanol productivity because such solids interfere with the enzyme kinetics, heat transfer and mixing of the mash. In addition, other benefits can be obtained as follows:
• Recovery of germ as valuable coproducts that can increase plant capacity and protein content of DDGS
• Recovery of coarse fiber as valuable coproducts that can be used for the production of corn fiber oil,corn fiber gum, as well as corn ethanol, resulting in an increase in capacity of plant,protein content of DDGS, and reduction in fiber content of DDGS.
• In Enzymatic Milling Process, recovery of pericarp and endosperm fiber as valuable coproducts can increase plant capacity and protein content of DDGS as well as reduce significantly fiber content in DDGS. In addition, the use of GSH enzymes during E-milling can results in a synergy effects, i.e. improving the fractionation process and converting starch into dextrins and sugars for fermentation.