Influence of acidogenic headspace pressure on methane production under schematic of diversion of acidogenic off-gas to methanogenic reactor

Bing Hua Yan, Ammaiyappan Selvam, Jonathan W C WONG*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

This study investigated the effects of 12.6 psi (T1), 6.3 psi (T2), 3.3 psi (T3) and ambient (T4) headspace pressure on the metabolic pathways in the acidogenic leach bed reactor (LBR) and overall methane recovery during two-phase anaerobic digestion of food waste. Diversion of biogas from LBR enhanced COD and soluble product generation in T2, T3 and T4 whereas, high pressure (T1) resulted in comparatively higher lactate production and low protein degradation. A pressure of 3–6 psi (T2 and T3) improved the production of COD by ∼22–36%, soluble products by ∼9–43%, volatile solid reduction by ∼14–19%, and CH4 production by ∼10–31% compared with control. Besides, ∼3–6 psi headspace pressure positively influenced the composition of soluble products resulting in enhanced methane recovery adding advantage to the two-phase system. A headspace pressure of ∼3–6 psi is recommended to enhance the hydrolysis-acidogenesis; however, the actual hydrogen concentration should be considered.

Original languageEnglish
Pages (from-to)1000-1007
Number of pages8
JournalBioresource Technology
Volume245
DOIs
Publication statusPublished - 2017

Scopus Subject Areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

User-Defined Keywords

  • Acidogenic off-gas
  • Anaerobic digestion
  • Headspace pressure
  • Metabolic pathway

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