Consider agitated types

Will the water activity of the substrate decrease significantly?

Will the bed pull away from the walls?

The organism grows quickly?

no no to both

Completely static operation in a packed bed (Chap. 7)

yes to one or both

Infrequent mixing (Chap. 10)

Rotating or stirred drums might be sufficient (Chap. 8)

Forced aeration will be necessary (Chap. 9)

Fig. 3.3. A suggested key for SSF bioreactor selection

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