Decay

• Microorganisms such as bacteria and fungi are responsible for decomposition
• Decay depends on:

  • Temperature
  • Oxygen availability
  • Water availability
  • Number of decay organisms
• Biogas

  • Made up of methane
  • Made by anaerobic decay of waste
  • Can be made in a simple fermenter
  • Cant be stored as a liquid as its pressure is too high
• Batch generators

  • Made biogas in small batches
  • Loaded with waste, which is left to digest
• Continuous generators

  • Make biogas all the time
  • Waste is continuously fed in
  • Biogas is produced at a steady rate
  • More suited to large-scale biogas projects