Biomass Digestion

Generate energy-rich biogas through digestion

biomass digestionOrganic waste and energy crops are digested in a biogas plant for the generation of sustainable energy. Biomass digestion plants have become increasingly important thanks to some of the advantages they have over other alternative energy sources such as solar and wind energy:

  • High energetic yields: combined with a CHP, biogas has an efficiency of 85%
  • Continuous operation: anaerobic digestic is an uninterrupted biological process
  • Waste processing: a number of different wet biomass streams can be processed and transformed into energy
  • Flexibility: biomass streams from different origins can be processed together
  • Recycling of raw materials: digestate as fertiliser


Every region has its own locally generated biomass feedstocks from agriculture, forest and urban sources. A wide variety of biomass feed-stocks are available, some of the most common and/or most promising biomass feedstocks are:

  • Grain and starch crops: corn, beets, willow, miscanthus, …
  • Manure from livestock
  • Forestry materials: logging residues, forest thinnings, …
  • Urban and suburban wastes: municipal solid waste, lawn wastes, wastewater treatment sludge, urban wood wastes, waste cooking oil, …


Through parallel digesters and different input streams in the biomass digestion plant, biogas is generated. The biogas plant uses wet fermentation, which means that the input streams have a minimum humidity of 40% and the reactor content has a dry matter content of up to 12%.

Option 1: After treatment of the digestate
After digestion of the organic waste, a digestate remains. It might be economically interesting to look into the possibilities of after treatment of this digestate, converting it into a valuable product through drying or pressing.

Option 2: Injection of the biogas into the grid
Biogas can be upgraded by running it through a filter, making it qualitatively suitable for injection into the natural gas network.

Option 3: Biofuel
To ensure a continuous supply of electricity and/or heat, a dual fuel motor (on PPO) is often added to the system.

Option 4: Biogas in transportation applications
Biogas can also be used as fuel for vehicles. In other words, cars and trucks can run on a sustaible type of fuel that you produce yourself!


As mentioned above, biogas installations have three types of output:

Electricity: The electricity that’s generated can be used to significantly reduce your energy bill.

Heat: The heat that’s generated during the combustion, can be used in processes that require a lot of heat.

Digestate: Digestate can be processed into pellets and/or fertiliser. Nothing is wasted and another waste product is converted into an economically valuable biproduct.

Our expertise

Upgrade Energy offers integrated energy solutions on a project base. Our clients are companies, electricity producers, agricultural companies and government institutions. Our multidisciplinary team takes care of the engineering, design, construction and operation and maintenance of the entire installation. Close monitoring and organisation of the biomass streams are essential.

If you would like to know more about the possibilities of biomass digestion for your company, please contact us.