CO2 levels in the fermenter are subject to natural fluctuations
Fermentation in a biogas plant generates a relatively large quantity of CO2. In the growth phase of the plants used for fermentation, this carbon dioxide was taken from the atmosphere and stored by the plants. During the fermentation process the stored CO2 is released – for efficient operation of the biogas plant it is important that the CO2 concentration does not exceed a defined value. Since the quantity of carbon dioxide depends on the exact composition of the biomass in the plant, however, the CO2 levels can fluctuate. To keep the CO2 content constant at 25 to 55 percent it is therefore necessary to monitor the fermentation process.