What is Anaerobic Digestion?


Anaerobic Digestion (AD) is a biological process that happens naturally when bacteria is used to break down organic matter in the absence of oxygen. Almost any organic material can be processed with Anaerobic Digestion including grass clippings, leftover food, industrial effluents, sewage and animal waste.

Anaerobic Digestion produces biogas which is typically made up of around 60% methane (CH4) and 40% Carbon Dioxide (CO2). This gas, or more specifically biogas, can be burnt to generate heat or electricity or can be used as fuel for vehicles.

Besides biogas, Anaerobic Digestion also produces a solid and liquid residue called digestate which can be used as a soil conditioner to fertilize land.

The amount of biogas and the quality of digestates obtained vary according to the feedstock used. More gas will be produced if the feedstock is putrescible (i.e. capable of decaying), which means it is more liable to decompose. Sewage and manure yield less biogas as the animal which produced the manure has already taken out some of the energy content.

TMC Fluid Systems supplies Biogas Compressors that are widely used for agitation of the contents of the digester. Biogas Compressors are typically used to recirculate the digestate by sucking the biogas at the top (or at the dome) of the digester and re-injecting it at the bottom of the digester.



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  8. Brightmark to Expand Western New York Dairy Biogas Project
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  12. Project Uses Renewable Electricity for RNG Production
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  14. From Waste to Gas
  15. Gas Clash Threatens Australian Export
  16. Maximizing Opportunities of Anaerobic Digestion from Wastewater
  17. Catalyst to Speed up Conversion of Biomass to Biofuel
  18. How It Works: Ethanol
  19. Anaerobic Digestion - the Next Big Renewable Energy Source
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  23. Bacteria Farts Power Wastewater Plant in Fort Wayne
  24. Europe’s First Poultry Manure Biogas Plant
  25. Electricity Using Pig Manure
  26. $38-Million Biodigester coming to Grand Rapids
  27. Biochar Could Benefit Anaerobic Digestion of Animal Manure
  28. Getting More out of Anaerobic Digestion
  29. Biogas prevents 20 million tonnes of CO2 emissions per year
  30. Converting to green gas grid ‘could be vital’


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Difference between a Turbo and Positive Displacement Blower