The effect of removal of resultant gas resulted in enhancement
of the H2 yield. The technique of CO2 scavenging
resulted in H2 yield being improved from 408 mL g-1
to reach the maximum of 422 mL g-1. The highest hydrogen productivity
of 87.9 ml L-1 h-1 was obtained by CO2
scavenging. Biomass concentration was enhanced to 1.47 g L-1,
YP/X of 287 ml g-1 L-1, YX/S
of 0.294 and YH2/s of 0.0377 by the use of CO2 scavenging.
The results suggested that the presence of the gaseous products in fermentation
medium and headspace adversely effect biomass growth and hydrogen production.
H. Alshiyab, M.S. Kalil, A.A. Hamid and W.M.W. Yusoff, 2008. Removal of Headspace CO2 Increases Biological Hydrogen Production by C. acetobutylicum. Pakistan Journal of Biological Sciences, 11: 2336-2340.