Secondary processing

Secondary processing covers either the direct or indirect (processing of intermediates from primary processing) valorisation of biowaste into a final product. While some technologies are used exclusively for the purpose of secondary processing, others (such as the separation processes and technologies) can be utilised in both primary and secondary processing.

Biochemical processes and technologies

• Composting
• Anaerobic digestion
• Gas fermentation
• Industrial fermantation
• Insect farming
• Solid state fermentation

Material processes and technologies

• Co-processing with plastics via extruder (see: UBQ)

Physicochemical processes and technologies

• Chemical extraction
• Crystallisation, flocculation, precipitation

Thermochemical processes and technologies

• Gasification
  • Air/Oxygen gasification
  • Catalytic gasification (indirect hydrogenation)
  • Hydrogasification (direct hydrogenation)
  • Steam gasification
• Pyrolysis
  • Catalysic cracking
    • One-step process
    • Two-step process
  • Hydrocracking
  • Thermal cracking
  • Thermal depolymerisation (does this apply also to biowaste?)