Biology Unit 3

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  • Produced by anaerobic fermentation
  • Mainly produces methane
  • Large scale = Industrial waste can be used, from sugar factories and from sewer works
  • Small scale =  supply energy for individuals, farms and villages
  • Organic waste can be used by plant waste from crops and animal faeces/urine
  • Many microorganisms involved in breakdown of material in biogas production
  • Works better in warm climates


  • Useful way to recycle
  • Fuel readily available
  • Useful in poor countries
  • Reduces use of fossil fuels
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