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Biofuels PowerPoint PPT Presentation

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Biofuels. Developed by Beth Morgan Dept. of Plant Biology. Corn stover. Miscanthus. Hybrid poplar. Sugar cane bagasse. Switchgrass. Types of Biofuel: Ethanol. Ethanol can be produced using:. Biggest Suppliers. Increase in Production. Making Ethanol From Seed.

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Developed by Beth Morgan

Dept. of Plant Biology

Types of biofuel ethanol

Corn stover


Hybrid poplar

Sugar cane bagasse


Types of Biofuel: Ethanol

Ethanol can be produced using:

Biggest suppliers

Biggest Suppliers

Increase in production

Increase in Production

Making ethanol from seed

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.


Energy yield

Energy Yield

Making ethanol from cellulosics cell wall breakdown

Making Ethanol From Cellulosics: Cell Wall Breakdown

Making ethanol from cellulosics

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.

Types of biofuel biodiesel


Jatropha tree

Palm oil


Types of Biofuel: Biodiesel

Bio-diesel can be produced using:

Making biodiesel

Waste Vegetable Oil




Washed Biodiesel







Washed Biodiesel


Making Biodiesel


Biofuel from vegetable oil

BioFuel from Vegetable Oil

Pros energy yield

Pros: Energy Yield

Pros energy yield1

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.

Pros energy yield2

Pros: Energy Yield

(gain is from photosynthesis)

Pros reduced emissions

Pros: Reduced Emissions

Emissions of major air pollutants from diesel engines

Cons loss of land for food production

Cons: Loss of Land for Food Production

Loss of rainforests

Loss of Rainforests

Water use increases

Water Use Increases

Soil fertility

Poplar trees

Switchgrass harvest in the Netherlands

Soybean harvest

Soil Fertility

Price of corn

Price of Corn 

Food vs fuel

Food vs. Fuel?

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