title: Effect of biogas sparging on the performance of bio-hydrogen reactor over a long-term operation.
abstract: This study aimed to enhance hydrogen production from sugarcane syrup by biogas sparging. Two-stage continuous stirred tank reactor (CSTR) and upflow anaerobic sludge blanket (UASB) reactor were used to produce hydrogen and methane, respectively. Biogas produced from the UASB was used to sparge into the CSTR. Results indicated that sparging with biogas increased the hydrogen production rate (HPR) by 35% (from 17.1 to 23.1 L/L.d) resulted from a reduction in the hydrogen partial pressure. A fluctuation of HPR was observed during a long term monitoring because CO2 in the sparging gas and carbon source in the feedstock were consumed by Enterobacter sp. to produce succinic acid without hydrogen production. Mixed gas released from the CSTR after the sparging can be considered as bio-hythane (H2+CH4). In addition, a continuous sparging biogas into CSTR release a partial pressure in the headspace of the methane reactor. In consequent, the methane production rate is increased.
authors.affiliation: Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen, Thailand.|Faculty of Food and Agricultural Technology, Phibulsongkram Rajabhat University, Pitsanulok, Thailand.
authors.forename: Chatchawin
authors.initials: C
authors.lastname: Nualsri
authors.affiliation: Chemistry Division, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Muang, Pattani, Thailand.|Bio-Mass Conversion to Energy and Chemicals (Bio-MEC) Research Unit, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Muang, Pattani, Thailand.
authors.forename: Prawit
authors.initials: P
authors.lastname: Kongjan
authors.affiliation: Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen, Thailand.|Research Group for Development of Microbial Hydrogen Production Process from Biomass, Khon Kaen University, Khon Kaen, Thailand.
authors.forename: Alissara
authors.identifier: http://orcid.org/0000-0001-7836-032X
authors.initials: A
authors.lastname: Reungsang
authors.affiliation: Division of Environmental Science and Engineering, Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Imai
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D019149:Bioreactors; D006859:Hydrogen / Q000378:metabolism*; D012722:Sewage
chemical_list: D056804:Biofuels; D012722:Sewage; D006859:Hydrogen