A pH- and temperature-phased two-stage process for hydrogen and methane production from food waste

Chun Feng Chu, Yu You Li, Kai Qin Xu, Yoshitaka Ebie, Yuhei Inamori, Hai Nan Kong

Research output: Contribution to journalArticlepeer-review

218 Citations (Scopus)

Abstract

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/m3/d or 64.4 kg-CODCr/m3/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/m3/d or 16.3 kg-CODCr/m3/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 H2/g VS added and 464 ml CH4/g VS added, respectively.

Original languageEnglish
Pages (from-to)4739-4746
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume33
Issue number18
DOIs
Publication statusPublished - 2008 Sep 1

Keywords

  • Bio-hydrogen
  • Food waste
  • Mesophilic methanogenesis
  • Thermophilic hydrogenesis
  • pH-phased two-stage process

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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