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

Biogas System integration

Project ID 03KB084

ACidestion - Modified VFA (fatty acid)-ensiling for controlling a demand-oriented biogas production

PlanET Minifermenter (Photo: FH Aachen)


  • 31.08.2013 – 31.07.2017


Fachhochschule Aachen - Institut NOWUM-Energy
Heinrich-Mußmann-Straße 1
52428 Jülich

Prof. Dr. Isabel Kuperjans – project manager
Telephone: +49 (0)241 6009-53954

Markus Dahmen – further contact person
Telephone: +49 (0)241 6009-53020


03KB084B - PlanET Biogastechnik GmbH

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Results only available in German.


Due to the load peaks in electricity generation from wind and solar it is an option to intercept the current gaps by biogas. The electricity thus must be generated on demand, which poses a challenge to a biogas plant. One solution is to increase the gas production through a targeted addition of alternative substrates.


Biogas should be used as a weather independent renewable energy source especially when wind and solar power is not available. This is not done by storing the biogas, but by a deliberate addition of alternatively ensiled silage. Thus, the gas production and the generation of electricity can be controlled according to demand. The modified silage will be generated by addition of specific microorganisms in the ensiling process. They produce short volatile fatty acids which can be converted very quickly into biogas. By addition of the modified silage in the digester the gas quality (CH4 content) and amount will increase.


  • Cultivation of specialized microorganism for butyric acid production
  • Generate modified silage with a high concentration of butyric acid
  • Use of the modified silage in a 1,5 m3 biogas digester
  • Control and process monitoring of the digester
  • Modeling and simulation of the dynamic behavior for a gas production according to demand


  • Modified silage
  • Butyric acid
  • Control strategy
  • Biogas plant


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