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Biofuels

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Types of Biofuel: Ethanol Ethanol ... Jatropha tree Palm oil Camelina Algae Making Biodiesel Biodiesel Water Washed Biodiesel Waste Vegetable Oil Lye Methanol ... – PowerPoint PPT presentation

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Title: Biofuels


1
Biofuels
Developed by Beth Morgan Dept. of Plant Biology
2
Types of Biofuel Ethanol
Ethanol can be produced using
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5
Biggest Suppliers
6
Increase in Production
7
Making Ethanol From Seed
1. Grow and collect grain.
2. Grind kernels into meal.
3. Heat and enzymes convert starch to sugar.
4. Anaerobic respiration by yeast.
5. Alcohol (ethanolº is distilled out of mixture.
Ethanol
8
Energy Yield
9
Making Ethanol From Cellulosics Cell Wall
Breakdown
10
Making Ethanol From Cellulosics
1. Collection, storage transportation to
refinery.
2. Dirt debris removed from material and then
shredded into small particles.
3. Heat, pressure or acid treatment. Enzymes in
solution are used to breakdown cellulose,
hemicellulose to sugars. Lignin is removed.
4. Syrup of sugars is filtered from solids.
5. Anaerobic fermentation by bacteria to produce
alcohol (and carbon dioxide).
6. Further enzymatic breakdown of cellulose and
lignin.
7. Anaerobic fermentation by bacteria to produce
alcohol (and carbon dioxide).
8. Alcohol is distilled.
9. More water removed.
10. Stored for distribution and use.
11
Types of Biofuel Biodiesel
Bio-diesel can be produced using
12
Making Biodiesel
Biodiesel
13
BioFuel from Vegetable Oil
14
Pros Energy Yield
15
Pros Energy Yield
For every unit of fossil energy used in the
entire biodiesel production cycle, 3.2 units of
energy are gained when the fuel is burned, or a
positive energy balance of 320 percent.
16
Pros Energy Yield
Fuel Energy yield Net (loss) or gain
Gasoline 0.805 (19.5)
Diesel 0.843 (15.7)
Ethanol 1.34 34
Biodiesel 3.2 320
(gain is from photosynthesis)
17
Pros Reduced Emissions
Emissions of major air pollutants from diesel
engines
18
Cons Loss of Land for Food Production
19
Loss of Rainforests
20
Water Use Increases
21
Soil Fertility?
22
Price of Corn ?
23
Food vs. Fuel?
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