Strategy of adjusting recirculation ratio for biohythane production via recirculated temperature-phased anaerobic digestion of food waste

Yu Qin, Jing Wu, Benyi Xiao, Ming Cong, Toshimasa Hojo, Jun Cheng, Yu You Li

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The stable H2 production is the important link in the anaerobic biohythane fermentation. In order to address the key parameters for the stable H2 production in the recirculated temperature-phased anaerobic digestion (R-TPAD)system, a critical strategy was proposed to adjust the recirculation ratio (R). The adjusting strategy was examined on a lab-scale R-TPAD system. The R-TPAD system was started up and operated with R = 1. Another system without recirculation (R = 0)was also operated as the control system. By narrowing the probable range from 0 < R < 1, the value of R = 0.4 was obtained for stable biohythane production from R-TPAD system. The harvested R-TPAD process achieved the volatile solids removal of 84.8% and the biohythane yield of 475 L/kg-VSfed with the H2 content of 10.5%, where the H2 yield efficiency was 248.0 mL-H2/CODremoved. The success of operating R-TPAD was attributed to the proposed strategy, which used the tendency of existing CH4 and the pH above 4.0 as the critical indicators for the stable H2 production.

Original languageEnglish
Pages (from-to)1235-1245
Number of pages11
JournalEnergy
Volume179
DOIs
Publication statusPublished - 2019 Jul 15

Keywords

  • Food waste
  • Hydrogen
  • Hythane
  • Methane
  • Recirculation ratio
  • Temperature-phased anaerobic digestion

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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