Physiological characteristics of the extreme thermophile Caldicellulosiruptor saccharolyticus: an efficient hydrogen cell factory

Table 2 Comparison of different sparging conditions

Sparging gas	Separation	Benefits	Drawbacks	Reference
N₂	Difficult	Not inhibitory	Difficult to separate from H₂ Expensive	[10, 28]
CO₂	Easy	Easily separated Produced in the process	Increases osmolarity Inhibits H₂ productivity	[10, 28]
CH₄	Easy	Easily separated Produced in a hybrid biohydrogen/biogas process	No results available for C. saccharolyticus	[5]
Under-pressure	Easy	Not inhibitory No dilution of the gas Cheap separation	Expensive at large scale Risk of contamination	[68]
No sparging	Easy	No dilution of the gas Cheap separation	Inhibits H₂ productivity Inhibits H₂ yield	[16]

ISSN: 1475-2859