title: Effects of anti-foaming agents on biohydrogen production.
abstract: The effects of antifoaming agents on fermentative hydrogen production using galactose in batch and continuous operations were investigated. Batch hydrogen production assays with LS-303 (dimethylpolysiloxane), LG-109 (polyalkylene), LG-126 (polyoxyethylenealkylene), and LG-299 (polyether) showed that the doses and types of antifoaming agents played a significant role in hydrogen production. During batch tests, LS-303 at 100μL/L resulted in the maximum hydrogen production rate (HPR) and hydrogen yield (HY) of 2.5L/L-d and 1.08mol H2/mol galactoseadded, respectively. The following continuously stirred tank reactor operated at 12h HRT with LS-303 at 100μL/L showed a stable HPR and HY of 4.9L/L-d and 1.17mol H2/mol galactoseadded, respectively, which were higher than those found for the control reactor. Microbial community analysis supported the alterations in H2 generation under different operating conditions and the stimulatory impact of certain antifoaming chemicals on H2 production was demonstrated.
authors.affiliation: Department of Environmental Engineering, Daegu University, Gyeongsan, Gyeongbuk 712-714, Republic of Korea; Center for Materials Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Japan.
authors.forename: Periyasamy
authors.initials: P
authors.lastname: Sivagurunathan
authors.affiliation: Department of Civil Engineering, Daegu University, Gyeongsan, Gyeongbuk 712-714, Republic of Korea.
authors.forename: Parthiban
authors.initials: P
authors.lastname: Anburajan
authors.affiliation: Center for Materials Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Japan.
authors.forename: Gopalakrishnan
authors.initials: G
authors.lastname: Kumar
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary.
authors.forename: Péter
authors.initials: P
authors.lastname: Bakonyi
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary.
authors.forename: Nándor
authors.initials: N
authors.lastname: Nemestóthy
authors.affiliation: Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary.
authors.forename: Katalin
authors.initials: K
authors.lastname: Bélafi-Bakó
authors.affiliation: Department of Environmental Engineering, Daegu University, Gyeongsan, Gyeongbuk 712-714, Republic of Korea. Electronic address: sanghkim1@daegu.ac.kr.
authors.forename: Sang-Hyoun
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000143:Acids / Q000032:analysis; D000934:Antifoaming Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D061249:Batch Cell Culture Techniques; D056804:Biofuels; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D005285:Fermentation / Q000187:drug effects; D005690:Galactose / Q000378:metabolism; D006859:Hydrogen / Q000378:metabolism*
chemical_list: D000143:Acids; D000934:Antifoaming Agents; D056804:Biofuels; D006859:Hydrogen; D005690:Galactose
keywords: Anti-foaming agents; CSTR; Galactose; Hydrogen production rate; Microbial community