Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 33, Issue 18, Pages 4739-4746Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2008.06.060
Keywords
Bio-hydrogen; Food waste; Mesophilic methanogenesis; Thermophilic hydrogenesis; pH-phased two-Stage process
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A pH-phased two-stage fermentation process combined thermophilic hydrogen production and mesophilic methane production with recirculation of the digested sludge was suggested in this study and its treatment performance was demonstrated by a continuous experiment treating organic fraction of municipal solid wastes (OFMSW). A thermophilic hydrogen production reactor was operated at a hydraulic retention time (HRT) of 1.3 days, corresponding to a loading rate of 38.4 kg-VS/m(3)/d or 64.4 kg-CODCr/m(3)/d. The short HRT and low pH applied here were enough to separate hydrogen production from methanogenesis. The mixed slurry with a high concentration of organic acids was then converted into CH4 by the mesophilic methane production reactor at a short HRT of 5.0 days, corresponding to a loading rate of 6.6 kg-VS/m(3)/d or 16.3 kg-CODCr/m(3)/d. The experiment was continued for over 150 days, and a stable performance for the simultaneous hydrogen and methane production was obtained. The yields of hydrogen and methane in this study were 205 ml H-2/g VS added and 464 ml CH4/g VS added, respectively. (c) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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