AMES, Iowa – David Grewell flipped on the augers that carry corn from a truck to a biorefinery.
Then, with a few more clicks of his computer mouse, he turned on the pumps that send grain all the way through an ethanol plant, from storage to hammer mill to slurry tanks to jet cooker to liquefaction, fermentation, distillation, water separation and ultimately to ethanol storage.
Don't forget the centrifuges, evaporators and driers that recover distillers grains for livestock feed.