Digestates resulting from methanization are characterized by their stability, their lower COD levels compared to nitrogen, and their high concentration of suspended materials.
Treatment tends to begin with phase separation to divide the solid (spreadable) fraction and the liquid fraction.
For the liquid fraction, Ovive suggests using Membrane Bioreactor in 2 configurations:
- Membrane Bioreactor MBR30 HC: High-load biological treatment while maintaining the agronomic value in the concentrate (volume concentration by a factor of 5 to 10)
- Membrane Bioreactor MBR20/+ LC: Low-load biological treatment for full on-site treatment
