title: Kinetics study of fermentative hydrogen production from liquid swine manure supplemented with glucose under controlled pH.
abstract: Kinetics of H2 production from liquid swine manure supplemented with glucose by mixed anaerobic cultures was investigated using batch experiments under four different pH conditions (4.4, 5.0, 5.6, and uncontrolled). The temperature for the experiments was controlled at 37 ± 1°C and the length of experiments varied between 50 and 120 hours, depending upon the time needed for completion of each individual experiment. The modified Gompertz model was evaluated for its suitability for describing the H2 production potential, H2 production rate, and substrate consumption rate for all the experiments. The results showed that the Gompertz model could adequately fit the experimental results. The effect of pH was significant on all kinetic parameters for H2 production including yield, production rate and lag time, and the substrate utilization rate. The optimal pH was found to be 5.0, at which a maximum H2 production rate (0.64 L H2/h) was obtained, and deviation from the optimal pH could result in substantial reductions in H2 production rate (0.32 L H2/h for pH 4.0 and 0.43 L H2/h for pH 5.6). The results also showed that if pH was not controlled for the batch fermentation process, the substrate utilization efficiency could steeply decrease from 98.8% to 33.7%.
authors: Southern Research and Outreach Center, University of Minnesota, Waseca, Minnesota, USA.
authors: Xiao
authors: X
authors: Wu
authors: Jun
authors: J
authors: Zhu
authors: Curtis
authors: C
authors: Miller
mesh_terms: D000818:Animals; D001419:Bacteria / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D005285:Fermentation; D005947:Glucose / Q000378:metabolism*; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008372:Manure / Q000032:analysis / Q000382:microbiology*; D013552:Swine
chemical_list: D008372:Manure; D006859:Hydrogen; D005947:Glucose