title: Removal of headspace CO2 increases biological hydrogen production by C. acetobutylicum.
abstract: 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'. 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), Y(P,X) of 287 ml g(-1) L(-1), Y(X/S) of 0.294 and Y(H2/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.
authors.affiliation: Faculty of Science and Technology, School of Bioscience and Biotechnology, Universiti Kebangsaan Malaysia, 43600 UKM, Bangi, Selangor, Malaysia.
authors.forename: H
authors.initials: H
authors.lastname: Alshiyab
authors.forename: M S
authors.initials: MS
authors.lastname: Kalil
authors.forename: A A
authors.initials: AA
authors.lastname: Hamid
authors.forename: W M W
authors.initials: WM
authors.lastname: Yusoff
mesh_terms: D019149:Bioreactors; D002245:Carbon Dioxide / Q000378:metabolism; D046969:Clostridium acetobutylicum / Q000378:metabolism*; D005285:Fermentation; D006859:Hydrogen / Q000378:metabolism
chemical_list: D002245:Carbon Dioxide; D006859:Hydrogen