Products from biogas fermentation

  • Biogas, methane content 45-70 % (~90 %)
  • Biogas can be turned into electricity and heat
  • Biogas can be washed and pressurized traffic-fuel
  • Separated fertilizer liquid
  • Nutrient rich and prepared nitrogen in bio fertilizer
  • Biowaste and dung to be used in raw materials (not waste)
  • Elimination of the smell
  • Hygienized bio-fertilizer

Typical biogas content

  • Methane CH4 45-75 % (~90 %)
  • Carbon dioxide CO2 25-45 % (~10 %)
  • Carbon oxide CO 0-0,3 %
  • Nitrogen N2 1-5  %
  • Hydrogen H2 0-3 %
  • Hydrogen sulfide H2S 0,1-0,5 % (0-40 ppm)

Typical methane output from different biomasses (usual values)

BiomaterialBiogas productionMethane content
 m3/tons of wet weight% of gas
Slaughter waste25070
Biowaste150-25065
Field biomass50-25055
Pig dung25-3565
Cow dung15-2560

Average energy content of biogas (rule of thumb):

  • 1 m3 of methane (100%) = 1 liter of oil = 10 kWh energy
  • Methane content of biogas assumed to be about 60 %

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1 m3 of biogas (methane content about 60%)
= about 6 kWh energy
= about 2 kWh electricity and about 3,5 kWh heat