title: Response of a biohydrogen-producing reactor to the substrate shift from sucrose to lactose.
abstract: The response of an upflow acidogenic granule-based reactor to the substrate shift from sucrose to lactose was investigated in this study. Experimental results show that it took 60h for the reactor to completely degrade the new substrate. Hydrogen production performance, in terms of H2 partial pressure, H2 production rate and H2 yield, was affected. Acetate, propionate, butyrate, valerate, caporate, ethanol and propanol were present in the reactor effluent, and their distribution changed significantly after the substrate shift. As the substrate was changed, the caproate- and ethanol-type fermentation was weakened, while the propionate-type fermentation was strengthened. Throughout the experiment, the butyrate-type fermentation played an important role. The H2 yield had a close correlation with both propionate and B/A (butyrate/acetate) in this substrate shift process.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Quan-Bao
authors.initials: QB
authors.lastname: Zhao
authors.forename: Yang
authors.initials: Y
authors.lastname: Mu
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Xian-Wei
authors.initials: XW
authors.lastname: Liu
authors.forename: Fang
authors.initials: F
authors.lastname: Dong
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D000085:Acetates / Q000378:metabolism; D019149:Bioreactors; D020148:Butyric Acid / Q000378:metabolism; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007785:Lactose / Q000378:metabolism*; D010313:Partial Pressure; D011422:Propionates / Q000378:metabolism; D013395:Sucrose / Q000378:metabolism*
chemical_list: D000085:Acetates; D011422:Propionates; D020148:Butyric Acid; D013395:Sucrose; D006859:Hydrogen; D007785:Lactose