Ethanol production is essentially the production of grain alcohol through fermentation. A common misconception is that the production of ethanol removes the feedstock grains from our food supply.
In actuality, starches are removed from the grains (and turned to sugars) for fermentation, leaving a high-protein product perfect for use as animal feed. A dry mill ethanol plant employs driers for the distillers grains byproduct.
Distillers dried grains (DDGs) can be stored and/or shipped long distances to animal feedlots. DWGs, or distillers wet grains can be shipped wet to nearby feedlots without the expense of drying.
These byproducts provide an additional source of profit for the ethanol plant. It is also possible to capture and sell CO2 as a byproduct for use in soft drinks or dried ice.