Bio fuels and Biogas

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  • Created by: JH1010
  • Created on: 14-10-15 07:27

Bio fuels

  • Fermentation
    • bacteria or yeast break dwon sugars by anaerobic respiration
    • E.g. Glucose -> Ethanol + Carbon Dioxide + Energy (break down by yeast)
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Biogas

  • 70% methane
  • 30% carbon dioxide
  • Fermentation of waste material
    • in generator or digester at constant temp
  • Batch Generators:
    • small batches
    • waste manually loaded
  • Continuous Generators:
    • producing all the time at steady rate
    • large scale
    • waste is constantly added - automatically
  • By-products:
    • Fertiliser
  • Factors to consider when designing a generator:
    • Cost - continuous more
    • Covenience - batch needs maual labour to load
    • Efficiency - temperature of 35 degrees (most efficient)
    • Position - smelly - away from homes
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Advantages of Bio fuels and Biogas

  • carbon neutral
  • less sulfur dioxide
  • less nitrogen oxides
  • methane not released
  • cheap and readily available
  • good fertiliser as by product
  • uses waste that would other wise pollute e.g. sewage
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