Optimizing feed composition for improved methane yield during anaerobic digestion of cow manure based waste mixtures

S. M. Ashekuzzaman, Tjalfe G. Poulsen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

This study investigated methane yield via anaerobic digestion of multi-component substrates based on mixtures of biodegradable single-component substrates with cow dung as main component. Bench and full-scale digestion experiments were carried out for both single and multi-component substrates to identify the relationship between methane yield and substrate composition. Results from both bench- and full-scale experiments corresponded well and showed that using multi-component substrates increases the methane yield much more than what would be expected from digestion of single substrates. Process stability as indicated by gas production, pH and NH4+ concentration variations were also improved by using multi-component substrates compared to digestion of single-component substrates. The results, thus, suggest that assessment of methane yield for multi-component substrates cannot reliably be based on methane yields for corresponding single-component substrates but should instead be measured directly.

Original languageEnglish
Pages (from-to)2213-2218
Number of pages6
JournalBioresource Technology
Volume102
Issue number3
DOIs
StatePublished - Feb 2011
Externally publishedYes

Keywords

  • Agricultural wastes
  • Anaerobic digestion
  • Methane potential
  • Multi-component substrates
  • Single-component substrates

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