Biogas Composition

The minute anaerobic digestion starts and biogas production begins on a technical scale chemical proposition of the substrates involved, are the starting point for the later biogas composition.

Below a possible composition is listed, giving a range of percentages, derived from empirical data:

Methane (CH₄) 40-75% 

Carbon dioxide (CO₂) 25-55% 

Hydrogen sulfide (H₂S) 50-5000ppm 

Ammonia (NH₃) 0-1% 

Water (H₂O) 0-10% 

Nitrogen (N₂) 0-5% 

Oxygen (O₂) 0-2% 

Hydrogen (H₂) 0-1%

Biogas composition is substrate depending and can be described with the formula developed by Buswell and Boyle.

• digester technology

• biogas basics

• microbiology behind anaerobic digestion

• Buswell and Boyle

• organic load

• process temperature

• pH and volatile fatty acids (VFA)

• suitable substrates

• biogas yield

• biogas calculator