AD feedstock and biogas yield


The material that is used in anaerobic digestion is called feedstock. What goes into a digester determines what comes out, so careful choice of feedstocks is essential. Depending on the feeedstock used, the biogas yield may vary hugely. Compare two extreme values: Fruit slop produces 8,6 m3 of gas per tonne of fresh material while Chip fat produces 826,5 m3 of gas per tonne of fresh material. Depending on the feedstock and the system design, the biogas produced is typically 55 to 75 percent methane pure. This also change the performance in the energy production.


The long-term transformation of biogas sector is ongoing. To meet expectations and the growing demand for biogas there is a need to improve process feasibility and to expand anaerobic digestion to a range of new substrates.