Project meeting of STEP at the site of the company ATS - Agro Trading & Solutions in Hardegsen (Photo: DBFZ)

Biogas Biomethane strategy

Project ID 03KB068

MEGAS - Optimization of a new membrane process to upgrade biogas aiming to feed the upgraded biogas into the natural gas grid

Pilot plant for biogas upgrading, interior view (Photo: Ingenieurbüro Buse)


  • 01.10.2012 – 31.12.2014


Ingenieurbüro Buse GmbH
Emmenfeld 2
21423 Winsen

Axel Braasch – project manager
Telephone: +49 (0)4171 667-097

Gerhard Buse – executive director and further contact person

Steffen Vogler – further contact person

Anja Rangette – further contact person
Telephone: +49 (0)4171 6677-096


03KB068B - Institute for Ecological Economy Research (IÖW)

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Results are only available in German. 


The main issue of the project is in developing and optimizing a new membrane process for upgrading biogas to methane, whereby the focus is on its potential contribution to climate change mitigation. The company, Ingenieurbüro Buse GmbH, has developed the process and was handling the technical optimization. Biogas upgrading is done by using membrane contactors. Decarbonated and demineralized water is used to remove carbon dioxide from biogas. This process is run with very low pressure and no use of further chemicals is necessary. Therefore, the new process is assumed to have a high climate protection potential.


  • Evaluation of the greenhouse gas emissions saving potential of this new process and its optimization with regard to climate protection
  • Evaluation of the cost effectiveness and operating efficiency regarding the combination with small biogas plants
  • Comparison to existing biogas upgrading processes to show the market potential of the new process and its potential to reduce greenhouse gas emissions



  • Review of the process for upgrading biogas directly from biogas fermenters to biomethane in natural gas quality (biomethane in this quality can be fed into the public gas grid)
  • Evaluation of the new process against ecological and economic criteria
  • Review of the process by measuring relevant values at a pilot plant in industrial size
  • Optimization of the process during the tests and study of its function in long term tests


  • Analyzing of socially relevant issues such as environmental performance, in particular greenhouse gas emission saving potential, as well as the profitability and regional economic impacts of both this new and already existing biogas upgrading processes
  • Assessment of the transferability of the new process and the potential contribution of biogas upgrading to sustainable development in the energy system, especially with regard to climate change mitigation



  • Biogas upgrading
  • Technical research
  • Feasibility of the new process


  • Environmental assessment of biogas upgrading
  • Profitability analysis


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