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Digester Selection (Dry Digestion (Class A Biosolids (No Fecal Material …

- - - - Pretreatment: Basic
        (Shred, Sieve, Magnet)
        
        Digestion:
        New Fermenters
        
        Compost
        
        Sieve
        
        Final Product:
        Class A Solids
  - - - Pretreatment: Basic
        (Shred, Sieve, Magnet)
        
        Digestion:
        New Fermenters
        
        Compost
        
        Sieve
        
        Final Product:
        Class B Solids
- - - - Pretreatment: Advanced
        (Shred, Sieve, Pulp, Cyclone)
        
        Digestion:
        Separate
        
        Thicken and/or Dewater
        
        Compost (optional)
        
        Sieve (optional)
        
        Final Product:
        Class A Solids
  - - - Pretreatment: Advanced
        (Shred, Sieve,
        Pulp, Cyclone)
        
        Digestion: Co-digestion (combined with MMSD)
        
        Thicken and/or Dewater
        
        Sieve (optional)
        
        Final Product:
        Class B Solids
        
        Enhanced pathogen reduction:
        Time/temperature, pasteurization, or chemical stabilization
        
        .