Digestate Post-treatment
Digestate Residue Separation
In order to improve the end product’s (digestion residue) of the biogas plant further processing and usability as a fertilizer, it is often separated into dry and liquid fractions. Nitrogen and potassium, one of the most important nutrients in the digestion residue, bind to a separated liquid fraction. Phosphorus typically binds to a separated dry fraction.
Among separation technologies there are:
- screw press
- sieve drum
- belt press
- decanter centrifuge
Digestate Residue is Processed into Fertilizers
Digestate residue of a biogas plant has a significant fertilizer value. However, utilizing digestate residues as fertilizers depends on the feedstocks used for biogas production as well as local legislation.
The digestate residue may be utilized as such, or
- dry fractions can be further pelletized
- liquid fractions may be further enriched with additional nutrients.