Biogas upgrading

Outstanding upgrade of Biogas with Amine

Biogas upgrading


Biogas upgrading is purification and refinement of biogas from anaerobe decomposition of organic matter by which the large content of carbon dioxide, hydrogen sulphide, steam and other impurities are removed so it becomes pure methane (biomethane). Through this process, it will conform with all norms and demands for natural gas and can be released directly into the natural gas grid or compressed and used as environmetally friendly fuel in the transport sector.


Whereas raw biogas contains large amounts of water, is corrosive, smelly, polluted with a lot of other gasses and has a varying low calorific value; the upgraded biogas is dry, non-corrosive and almost odourless before trace odour is added and with a high homogenous calorific value. Upgraded biogas can therefore be utilised for anything that natural gas can be used for and can be transported from one end of the country to the other, as well as being stored for years in the natural gas grid.

Societal and environmental benefits of biogas


The advantages of transforming suited organic waste matter into upgraded biogas are both numerous and significant.

Upgraded biogas can play a key part in the green transition through ensuring the energy flow to both industry and consumers, even when the sun isn’t shining, and there is no wind. When adapted for cars, it can achieve fulfilment of the EU directive that a certain part of the fuel must be green.

 The treatment of livestock waste in a biogas facility means that there is not only a financial gain by selling the gas, but also that the manure is subsequently more homogenous. At the same time, it is easier for the plants to digest, easier to distribute, and leaves behind substances that can help maintain a healthy thickness of the topsoil.

For the CO2 balance, the treatment of the waste in a biogas plant has a resounding advantage. Instead of having waste energy rotting on the ground or in the slurry tank, the transformation into methane makes the energy useful; in addition to that, an equivalent amount of fossil energy can be saved. This advantage continues, as, without biogas plants, the manure is stored for several months before it is spread out on the ground. During the subsequent decomposition of the waste material, methane and laughing gas etc. are formed that are much more potent greenhouse gasses than CO2. So the combined environmental gain is 3-4 times bigger than the direct replacement of the fossil fuel. (the loss of methane in an Ammongas plant is all the way down to 0,04%, lowest on the market)

Upgraded biogas can also be produced from household waste, e.g. separation at source of garbage collection. Burning wet garbage, such as banana peels and leftover gravy, the gain is insignificant, whereas it is considered excellent material for a biogas plant. In addition, a biogas plant with upgrading capabilities is far cheaper than an incineration plant.

The process


The transformation from organic waste material into biogas is executed by microorganisms in large tanks. The succeeding purification process in an Ammongas upgrading plant cleanses the raw gas directly (meaning no pre-cleansing is needed) with a watery solution of an alkaline liquid that dissolves, thus, removes the acidic pollutants in the gas (CO2 and hydrogen sulphide and more). After this, the gas is compressed, dried and measured before it is delivered to the pipes from a natural gas company. At the regeneration of the used cleaning liquid, heat is used to separate CO2 from the liquid. The heat however, can be reused afterwards to keep the biogas reactors warm, or as a supplement to district heating, which gives an additional advantage in the profit and loss account.

Since the power consumption for the Ammongas process is only 0,1kWh/m3 biogas the net energy consumption is very low. At the same time the methane loss is below 0,04%, which not only saves energy, but also works in favour for climate balance. Finally, a plant from Ammongas is stable, has a high operational up-time, low demand for service and a significant lifetime for the components, meaning you, as a customer, are ensured easy operations and optimal income for both the short and long term.

Ammongas delivers

Ammongas does not manufacture the biogas plant itself, but the plant that subsequently ensures an effective and thorough cleaning of the gas. Since the process is completed without pressure and without the need for pre-cleansing of the gas, the need for service and maintenance at later stages are minimalised. The pressure-less operation means it is possible to construct larger plants without corresponding price increases. Current reference list goes from 300 to 3000m3/h, but the plants can easily be adapted for larger output if there is a need.

No matter the size, plants are delivered on prefabricated frames, hereby ensuring that all parts are easily accessible for both service and operation. We can deliver to both new and existing biogas plants.

If your requirements deviate from the above mentioned, please contact us and we will see if we can find a solution.

After the initial start-up, there is a run-in period, where we ensure that the plant is operating according to the specification.  We also offer a service agreement, securing the plant’s optimal long-term operation productivity.

Examples of clients:

  • Municipalities and their utility companies
  • Manufacturers of biogas plants
  • Investment companies
  • Individual farmers
  • Groups of farmers

Technical brochure

Biogas Upgrading List of References