title: Construction of hydrogen fermentation from garbage slurry using the membrane free bioelectrochemical system.
abstract: The aim of this study was to show the effectiveness of the membrane free bioelectrochemical system (BES) using three electrodes on inhibition of methanogenesis and construction of hydrogen fermentation from the artificial garbage slurry. The electrical redox-potential on the working electrode was adjusted to -1.0V (vs. Ag/AgCl) that has positive effect on methanogenesis. The redox-potential on the counter electrode was measured to be 1.6V. The pH in the effluents was 5.5-6.4. Hydrogen production rate at the cathode side was similar to that at the anode side and much higher than that calculated from current, and reached a maximum of 2445±815 (average±standard deviation) mL L(-1) d(-1) at an organic loading rate of 58.7g dichromate chemical oxygen demand per L d(-1). Methane production was negligible throughout the experiment. Acetate and butyrate were the main products of the fermentation using a BES; these offered favorable conditions for hydrogen production. The bacterial community in the bioelectrochemical hydrogen fermentor differed from that in the methanogenic seed sludge and included hitherto unknown species. These results show that high redox-potential on the anodic electrode and acidic pH in the membrane free BES can be utilized for hydrogen fermentation from the artificial garbage slurry by avoiding methanogenesis.
authors.affiliation: Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko-shi, Chiba-ken 270-1194, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Sasaki
authors.forename: Masahiko
authors.initials: M
authors.lastname: Morita
authors.forename: Norio
authors.initials: N
authors.lastname: Matsumoto
authors.forename: Daisuke
authors.initials: D
authors.lastname: Sasaki
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Hirano
authors.forename: Naoya
authors.initials: N
authors.lastname: Ohmura
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Igarashi
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics; D019149:Bioreactors / Q000592:standards*; D004566:Electrodes / Q000592:standards; D005285:Fermentation; D005735:Garbage; D006859:Hydrogen / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007218:Industrial Microbiology / Q000295:instrumentation; D008566:Membranes; D008697:Methane / Q000378:metabolism; D008969:Molecular Sequence Data; D012722:Sewage / Q000382:microbiology
chemical_list: D012722:Sewage; D006859:Hydrogen; D008697:Methane