Effect of ethanol pre-fermentation and inoculum-to-substrate ratio on methane yield from food waste and distillers' grains

Chuanfu Wu, Qunhui Wang, Miao Yu, Xiao Zhang, Na Song, Qiang Chang, Ming Gao, Kenji Sonomoto

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Anaerobic digestion of food waste and distillers' grains with ethanol pre-fermentation (EP) at different inoculum-to-substrate ratios (ISRs) was investigated. With EP, the highest methane yield of 581.2. mL/g-VS was observed at ISR 2.5, with the methane yields of ISR 1.0 and ISR 0.4 being 41.8% and 71.7% lower. At the same ISR, the methane yield without EP (control group) was 143.2. mL/g-VS, 57.7% lower than that with EP. EP effectively alleviated inhibition by acidification, greatly reduced the duration of the lag phase, and markedly stimulated the growth of methanogens, compared with that of the control group. Thermodynamics analysis of various acidogenic fermentation patterns suggested that directing the acidogenic phase towards ethanol, instead of towards volatile fatty acids, allocates more potentially available energy for methanogens. Thus, EP prior to anaerobic digestion is a suitable way to stabilize an anaerobic digestion system even at a low ISR.

Original languageEnglish
Pages (from-to)846-853
Number of pages8
JournalApplied Energy
Volume155
DOIs
Publication statusPublished - Oct 1 2015

Fingerprint

Fermentation
fermentation
ethanol
Methane
Ethanol
methane
substrate
food
Substrates
Anaerobic digestion
Methanogens
Volatile fatty acids
Enzyme inhibition
Acidification
effect
acidification
fatty acid
thermodynamics
Thermodynamics
energy

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

Cite this

Effect of ethanol pre-fermentation and inoculum-to-substrate ratio on methane yield from food waste and distillers' grains. / Wu, Chuanfu; Wang, Qunhui; Yu, Miao; Zhang, Xiao; Song, Na; Chang, Qiang; Gao, Ming; Sonomoto, Kenji.

In: Applied Energy, Vol. 155, 01.10.2015, p. 846-853.

Research output: Contribution to journalArticle

Wu, Chuanfu ; Wang, Qunhui ; Yu, Miao ; Zhang, Xiao ; Song, Na ; Chang, Qiang ; Gao, Ming ; Sonomoto, Kenji. / Effect of ethanol pre-fermentation and inoculum-to-substrate ratio on methane yield from food waste and distillers' grains. In: Applied Energy. 2015 ; Vol. 155. pp. 846-853.
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AU - Chang, Qiang

AU - Gao, Ming

AU - Sonomoto, Kenji

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