Carbon Dioxide (CO 2 )

1. ETHANOL BYPRODUCTS: Distillers Grain and CO2 • Dried Distillers Grains with Solubles, (DDGS) • Distillers grain is the fraction of the corn seed remaining after the distillation of ethanol • 18 pounds per bushel of corn processed • A high protein livestock feed (25 to 27% crude protein). • Use wet, partially dried or dry. • Dietary requirements of livestock limit the amount of DDGS feed that can be fed. • Potential DDGS Consumption by Wisconsin’s 1.2 million dairy cows • 10% of feed ration • Need 1.9 billion pounds of DDGS • Ethanol production to supply DDGS • 282 million gallons • 105 million bushels of corn • 20% of feed ration • Need 3.9 billion pounds of DDGS • Ethanol Production to supply DDGS • 564 million gallons • 210 million bushels of corn • Wisconsin’s total corn crop potential • 6.2 billion pounds DDGS • Carbon Dioxide (CO2) • 18 pounds of CO2 produced per bushel of corn (146 cubic feet - ~ 5’ x 5’ x 6’) • Byproduct of fermentation process. • Three ethanol plant in Wisconsin currently recover and sell CO2 • Some uses of Carbon Dioxide: • Refrigerant – Dry Ice Soft Drink carbonation • Welding gas Industrial gas lasers – cutting metal • Fire ExtinguishersFor boosting plant growth in greenhouses • Used in process for de-caffeination of coffee • Non-Flammable pressurized gas – life jackets, paintball guns, blasting in coal mines