Improving biogas quality and methane yield via co-digestion of agricultural and urban biomass wastes

Tjalfe G. Poulsen*, Laetitia Adelard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Impact of co-digestion versus mono-digestion on biogas and CH4 yield for a set of five biomass materials (vegetable food waste, cow dung, pig manure, grass clippings, and chicken manure) was investigated considering 95 different biomass mixes of the five materials under thermophilic conditions in bench-scale batch experiments over a period of 65 days. Average biogas and CH4 yields were significantly higher during co-digestion than during mono-digestion of the same materials. This improvement was most significant for co-digestion experiments involving three biomass types, although it was independent of the specific biomasses being co-digested. Improvement in CH4 production was further more prominent early in the digestion process during co-digestion compared to mono-digestion. Co-digestion also appeared to increase the ultimate CH4/CO2 ratio of the gas produced compared to mono-digestion although this tendency was relatively weak and not statistically significant.

Original languageEnglish
Pages (from-to)118-125
Number of pages8
JournalWaste Management
Volume54
DOIs
StatePublished - 1 Aug 2016
Externally publishedYes

Keywords

  • Biomass mix composition
  • Biomass wastes
  • CH/CO ratio
  • Co-digestion
  • Methane yield
  • Thermophilic conditions

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