You know that there is more biogas in your feedstock than you are getting out.
As long as you can still separate out solids or have a floating layer, there is still biogas potential left.
With the Kalle Rave effect you get a few more percent of biogas out of your feedstock.
The Kalle Rave effect
Kalle Rave is a biogas plant operator near Flensburg. He is currently also regional group spokesman of the German Biogas Association (Fachverband Biogas) in Schleswig-Holstein.
Kalle has a standard single-stage biogas plant.
As part of a BAFA assignment, I compared his feedstock quantities with his electricity production. His biogas yield is well above the KTBL benchmark. I couldn’t explain why.
Then I visited his plant and asked Ole, his operations manager, about the feeding intervals. Every hour? Every half hour?
“Nope, half in the morning, the other half in the evening,” said Ole.
