title: Effect of operational pH on biohydrogen production from food waste using anaerobic batch reactors.
abstract: This study was performed to investigate the influence of operational pH on dark H(2) fermentation of food waste by employing anaerobic batch reactors. The highest maximum H(2) yield was 1.63 mol H(2)/mol hexoseadded at operational pH 5.3, whereas the lowest maximum H(2) yield was 0.88 mol H(2)/mol hexoseadded at operational pH 7.0. With decreasing operational pH values, the n-butyrate concentration tended to increase and the acetate concentration tended to decrease. The highest hydrogen conversion efficiency of 11.3% was obtained at operational pH 5.3, which was higher than that (8.3%) reported by a previous study (Kim et al. (2011) 'Effect of initial pH independent of operational pH on hydrogen fermentation of food waste', Bioresource Technology 102 (18), 8646-8652). The new result indicates that the dark fermentation of food waste was stable and efficient in this study. Fluorescence in situ hybridization (FISH) analysis showed that Clostridium species Cluster I accounted for 84.7 and 13.3% of total bacteria at operational pH 5.3 and pH 7.0, respectively, after 48 h operation.
authors.affiliation: Dept of Civil Engineering, The University of Suwon, San 2-2, Wau-ri, Bongdam-eup, Hwaseong-si, Gyeonggi-do, 445-746, Republic of Korea.
authors.forename: Chaeyoung
authors.initials: C
authors.lastname: Lee
authors.affiliation: Dept of Civil Engineering, The University of Suwon, San 2-2, Wau-ri, Bongdam-eup, Hwaseong-si, Gyeonggi-do, 445-746, Republic of Korea.
authors.forename: Sewook
authors.initials: S
authors.lastname: Lee
authors.affiliation: Dept of Environmental Health, Korea National Open University, 169 Dongsung-dong, Jongno-gu, Seoul 110-791, Republic of Korea E-mail: skhan003@knou.ac.kr.
authors.forename: Sun-Kee
authors.initials: SK
authors.lastname: Han
authors.affiliation: Environmental Science & Environmental Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu,Yongin-si, 446-701, Republic of Korea.
authors.forename: Sunjin
authors.initials: S
authors.lastname: Hwang
mesh_terms: D001419:Bacteria / Q000378:metabolism; D019149:Bioreactors; D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000737:chemistry; D005232:Fatty Acids, Volatile / Q000737:chemistry / Q000378:metabolism; D005285:Fermentation; D005502:Food; D006859:Hydrogen / Q000737:chemistry / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste
chemical_list: D002241:Carbohydrates; D005232:Fatty Acids, Volatile; D062611:Solid Waste; D006859:Hydrogen