Guide numbers

Methane percentage of biogas 50 - 75 %
Total heat-value of biogas 5,0 - 7,0 kWh/Nm3
Average total heat-value of biogas 6,0 - 6,2 kWh/Nm3
Electriccity production 1,5 - 2,2 kWh/Nm3
Specific costs of investment calculated on 1 kW built-in output 2.500 - 5.000 EUR/kW
Amount of biogas produced out of 1 ton of manure 22 - 35 Nm3
Amount of biogas calculated on an output of 1 kW 2.500 Nm3

Biogas composition:
Component

Concentration
% (v/v)

Methane 50 - 75
Carbon dioxide 25 - 45
Water 2 (20°C) - 7 (40°C)
Nitrogen < 2
Oxygen < 2
Hydrogen sulfide < 1
Hydrogen < 1

Temperature ranges
Type Temperature Retention time
Psychrophilic < 25 °C 60 days
Mesophilic 30 - 45 °C 30 days
Thermophilic > 50 °C 15 days

Biogas output guide numbers
Substrate source Biogas output
m3/day
Current generation
kWh/year
100 milking cows 210 150.000
100 young cattle 60 46.000
100 pigs 15 10.500
100 breed pigs 20 16.500
1 hectare meadow 14 10.000
1 hectare maize for silage, 18 tons of dry matter 32 21.000
1 hectare alfalfa, 14 tons dry matter 20 13.500