The advantages and disadvantages
of converting bio crop waste to
electric energy
11720166 Shohei Iwamoto
Bio crop waste
We people eat crop everyday.
Crops
・Rice
・Wheat
・Corn
・Sugar etc..
→We eat or use only a part of them.
The rest of them, “bio crop waste” can be used in
various ways.
The various ways of using
bio crop waste
From bio crop waste we can produce
・Methane gas
・Ethanol
・Hydrogen etc..
These can be used as sources of energy .
→electric generation
→agrichemical
→medicine
The advantages of converting bio crop
waste to electric energy
・Carbon neutral
CO2 emitted by
generating electric
energy is equal to CO2
plant absorbed.
photosynthesis
・No depletion
growth
CO2 absorption
CO2
・Low cost
Electric energy
bio crop waste
electric generation
There are no increment
in CO2.
The advantages of converting bio crop
waste to electric energy
・No depletion
Bio crop waste is not exhaustible resource.
→People grow a crop and the crop has parts we
don’t eat.
Cf.)Oil will run out in about 42 years.
The advantages of converting bio crop
waste to electric energy
・Low cost
Bio crop waste is “waste.”
There are many bio crop waste in the world.
→It is important to use the waste effectively.
The disadvantages of converting bio
crop waste to electric energy
・Dependence on the season
In harvest season, there is a large amount of
bio crop waste but in planting season is a
small amount of it.
→Stable electric energy supply is difficult .
Crop
Harvest
Wheat
October
Rice
June
Sugar
February
The disadvantages of converting bio
crop waste to electric energy
・Low energy density
Bio crop waste has small weight but has a large
volume.
→A large amount of bio crop are needed to
generate electric energy.
Conclusion
The advantages and disadvantages of
converting bio crop waste to electric energy
Advantages : Carbon neutral
No depletion
Low cost
Disadvantages : Dependence on the season
Low energy density
References

http://www.enecho.meti.go.jp/topics/energyin-japan/energy2010html/world/index.htm

Yasuo Igarashi, Takashi Saiki, Ethanol
product from rice straw, bio mass(2008),
p.187