Download - Biofuel video youtube/watch?v=kMrVUBlEGWc
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Biofuel video
http://www.youtube.com/watch?v=kMrVUBlEGWc
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Biofuels have several advantages• Crop-based biofuels consume CO2 duringphotosynthesis• Residue-based biofuels reduce demand for newfuels and bring value to waste products• Domestic sources of biofuels are available• Renewable• Biodegradeable
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There are several different sources of ethanol• Starches: corn, etc.– least amount of energy return per unit mass– process into sugars, then ferment to alcohol• Sugars: sugar cane, sugar beets, etc.– more energy output per unit mass than corn– ferment directly to alcohol• Cellulosic materials: corn stover, wood chips, switchgrass,…– grows without irrigation, tillage, topsoil erosion• not everyone agrees with these claims– requires enzymes to break down lignin
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