Raw biogas produced from digestion is roughly 60% methane and 29% CO2 with trace elements of H2S…. Methane in biogas can be concentrated via a biogas upgrader to the same standards as fossil natural gas, which itself has had to go through a cleaning process, and becomes biomethane.”

cited from: Biogas. (2014, August 22). In Wikipedia, The Free Encyclopedia. Retrieved 07:29, September 12, 2014, from

Tailor made solutions are essential

The gas processing thus encompasses mainly a substantial removal of water, carbon dioxide and hydrogen sulfide, as well as conditioning and compression. As a consequence biomethane can be used as a substitute for natural gas, in particular an adjustment of the calorific value, defined in the Wobbe Index, must occur. Depending on the technical and economic conditions different gas treatment processes are used and combined:

  • Pressure water wash
  • Pressure Swing Adsorption
  • Glycol washing
  • Amine scrubbing
  • Membrane separation

The optimal method depends on the individual local conditions and therefore the selection process involves an objective, vendor-independent analysis of the pros and cons.

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