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There are many different types of biomass residues, wastes and/or energy crops available worldwide. To be able to optimally utilize, the different types of available biomass in a costs effective and efficient matter, several technologies are developed.



Biomass combustion is the most common biomass conversion technology, applied on household and industrial levels since ancient times. Over the last decades, however, modern biomass combustion technologies have emerged like fully automated pellet boilers, co-firing, and efficient combined heat and power production for a large variety of biomass resources.


Gasification of liquids

Gasification offers the advantage to produce an intermediate homogeneous fuel (producer gas) from an inhomogeous solid fuel for secondary conversion. BTG established its reputation as a world-leading entity in the field of demonstration, dissemination and monitoring of small-to-medium scale biomass-fuelled power and heat gasifiers in the early eighties.

Biomass gasification is an endothermic thermal conversion technology where a solid fuel is converted into a combustible gas. A limited supply of oxygen, air, steam or a combination serves as the oxidizing agent. The product gas consists of carbon monoxide, carbon dioxide, hydrogen, methane, trace amounts of higher hydrocarbons (ethene, ethane), water, nitrogen (with air as oxidant) and various contaminants, such as small char particles, ash, tars, higher hydrocarbons, alkalies, ammonia, acids, and the like.

Fast pyrolysis


Fast pyrolysis transforms difficult-to-handle biomass of different nature into a clean and uniform liquid, called pyrolysis oil. BTG developed a robust fast pyrolysis process resulting in a large fraction of pyrolysis oil, which can be used for heat, power, transport fuels and chemicals production.

Carbonisation & torrefaction

Carbonisation and torrefaction

Charcoal production from wood is the most common carbonisation technology, but also agro residues like cotton stalks can be carbonised and further upgraded to household fuels. Torrefaction is a partial carbonisation process at temperatures of 200-400°C, making the biomass ‘crispy’, comparable with roasting of coffee beans. The torrefied biomass is suitable for co-firing in coal-fired power plants. Compared to carbonised biomass, a higher percentage of the initial energy content of the biomass stays in the product.

Anaerobic digestion

Anaerobic digestion

Anaerobic digestion is the production of a methane rich biogas from wet biomass sources like manure, kitchen and garden waste, wastewater, etc. The biogas can be used for heat and power generation using gas engines, or upgraded for use in the natural gas grid.

BTG provides in-depth technical advice and due diligence on each of these bioenergy technologies. BTG has implemented several Anaerobic Digestion plants and has very good grasp of all the issues related to the technology. Moreover, BTG has an excellent overview of biomass resources, technologies and the energy market, which enables BTG to provide the best possible bioenergy solutions for its clients:

  • Each individual project is unique and requires tailor made advice, for instance in the form of a feasibility study.
  • In addition, BTG performs market studies and scenario studies that investigate the best combinations of resource availability, technology, economics and sustainability on a more aggregated level.