title: Enhanced bio-hydrogen production from corncob by a two-step process: dark- and photo-fermentation.
abstract: Enhanced bio-hydrogen production from pretreated corncob by integrating dark-fermentation with photo-fermentation process was investigated in this study. In the first step, the maximum bio-hydrogen yield and rate from corncob by dark-fermentation was 120.3+/-5.2 mL H(2)/g-corncob and 150 mL H(2)/(Lh), respectively. In the second step, a hydrogen yield of 713.6+/-44.1 mL H(2)/g-COD was obtained from digesting the effluent of dark-fermentation by photosynthetic bacteria. Meanwhile, COD removal efficiency achieved 90%. Bio-hydrogen production in the first step was mainly attributed to the bioconversion of the reducing sugars and oligosaccharides in the hydrolyzate of corncob. Bio-hydrogen production in the second step was due to the biodegradation of acetic acid, butyric acid, butyl alcohol and ethanol in the effluent of dark-fermentation.
authors: State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, PR China.
authors: Honghui
authors: H
authors: Yang
authors: Liejin
authors: L
authors: Guo
authors: Fei
authors: F
authors: Liu
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D001709:Biotechnology / Q000379:methods*; D020148:Butyric Acid / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry; D003246:Conservation of Energy Resources; D003624:Darkness; D004736:Energy-Generating Resources; D005285:Fermentation; D005579:Fossil Fuels; D006859:Hydrogen / Q000737:chemistry*; D006868:Hydrolysis; D008027:Light; D010788:Photosynthesis; D016354:Rhodobacter capsulatus / Q000378:metabolism
chemical_list: D005579:Fossil Fuels; D020148:Butyric Acid; D002244:Carbon; D006859:Hydrogen; D002482:Cellulose