Table 6.

A comparison of 2,3-butanediol productivity in a packed bed biofilm reactor with productivities in other reactor types

Reactor Type	Culture	Substrate	Productivity [gL-1h-1]	Reference
Biofilm, continuous	K. pneumoniae	Whey permeate	11.70	[23]
Batch (control)	A. aerogenes	Glucose	1.10	[96]
Continuous reactor (free cells)	K. pneumoniae	Glucose	4.25	[97]
Immobilized cell continuous	K. pneumoniae	Whey permeate	2.30	[98]
Cell recycle, continuous	B. polymyxa	Whey permeate	1.04	[95]
Cell recycle, continuous	K. pneumoniae	Glucose	9.84	[99]
Cell recycle, continuous	E. aerogenes	Glucose	5.40	[100]