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Novozymes in brief
[object Object],[object Object],[object Object],Cassava based ethanol in an African context
[object Object],[object Object],[object Object],[object Object],Benefits of small scale agro-forestry systems producing ethanol to replace charcoal
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Outline of a potential smallholder/outgrower based system
Smallholder agro-forestry concept with integrated food, feed and fuel production
The Fuel Ethanol Process
Raw Materials for Ethanol Production ,[object Object],[object Object],[object Object],[object Object],[object Object]
Starch in cassava Protein middle lamella Outer wall (  -Glucan and pentosan) Inner cell wall (  -Glucan) Starch granules Protein matrix
General overview of starch conversion to ethanol
3 types of enzymes required ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Three stages where enzymes are added Milling /Slurry make up Cooking Fermentation Type of enzyme added Viscosity reducing enzyme Alpha-Amylase Gluco-Amylase Enzyme name ,[object Object],[object Object],1. Liquozyme SC 2. Liquozyme SCDS ,[object Object],[object Object],[object Object],Main Purpose Reduce viscosity due to non starch polymers ,[object Object],[object Object],To convert dextrin to glucose Other Benefits 1. Enable mash to be pumped 2. Avoids gel formation 3. Lower heating and cooling cost  ,[object Object],[object Object],[object Object],Enables yeast to consume the glucose and generate ethanol Working Temp 50-55°C 84-86°C 32-35°C
Ethanol yield from starch: Cassava example   Yields from 1 ton raw material     Cassava Roots Chips Starch % Starch 25 65 85 100% theoretical       Ethanol, litres 180 468 612 93% efficiency       Ethanol, litres 167 435 569
Milling & Cook:  Slurry formation and initial breakdown of starch ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Initial breakdown of starch into shorter dextrin chains Alpha-Amylase enzyme randomly cleaves large chain dextrins into a mixture of shorter chain dextrins Alpha-amylase Shorter dextrin chains Large  Dextrin chains DP6 DP4 DP3 DP2
Further breakdown of dextrins into fermentable sugars: Two main process options ,[object Object],[object Object],[object Object],[object Object],[object Object],Saccharification: Breakdown of dextrins into glucose
What does Gluco-Amylase do? Gluco-Amylase breaks short chain dextrins into simple fermentable sugars that yeast can convert into ethanol Long chain sugars (Dextrins) Simple sugars
Typical cost breakdown for cassava-based ethanol production – example from Asia
How Novozymes can assist you ,[object Object],[object Object],[object Object]
Thank You for your attention  Please visit our website www.bioenergy.novozymes.com   Technical service contact:  [email_address]

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Session 2.3 Bioenergy and Cassava - Novozymes by Tuxen

  • 1.  
  • 3.
  • 4.
  • 5.
  • 6. Smallholder agro-forestry concept with integrated food, feed and fuel production
  • 8.
  • 9. Starch in cassava Protein middle lamella Outer wall (  -Glucan and pentosan) Inner cell wall (  -Glucan) Starch granules Protein matrix
  • 10. General overview of starch conversion to ethanol
  • 11.
  • 12.
  • 13. Ethanol yield from starch: Cassava example   Yields from 1 ton raw material     Cassava Roots Chips Starch % Starch 25 65 85 100% theoretical       Ethanol, litres 180 468 612 93% efficiency       Ethanol, litres 167 435 569
  • 14.
  • 15. Initial breakdown of starch into shorter dextrin chains Alpha-Amylase enzyme randomly cleaves large chain dextrins into a mixture of shorter chain dextrins Alpha-amylase Shorter dextrin chains Large Dextrin chains DP6 DP4 DP3 DP2
  • 16.
  • 17. What does Gluco-Amylase do? Gluco-Amylase breaks short chain dextrins into simple fermentable sugars that yeast can convert into ethanol Long chain sugars (Dextrins) Simple sugars
  • 18. Typical cost breakdown for cassava-based ethanol production – example from Asia
  • 19.
  • 20. Thank You for your attention Please visit our website www.bioenergy.novozymes.com Technical service contact: [email_address]

Notas do Editor

  1. Agribusiness that works : outgrower schemes with supply-driven growth Create a market for the smallholders that can begin small but grow rapidly Promise to buy their produce, live up to that promise and the supply base will grow rapidly (example of DECA) Provide advice and planting material and support No lands rights issues, low investment levels, limited infrastructure requirements, limited management costs, limited work ethic issues