Integration of pyrolysis and anaerobic digestion - Use of aqueous liquor from digestate pyrolysis for biogas production

Tobias Hübner, Jan Mumme*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Anaerobic digestion of aqueous pyrolysis liquor derived from pyrolysis of solid digestate was tested in batch mode using an un-adapted inoculum. Three pyrolysis liquors produced at 330°C, 430°C and 530°C in four COD-based concentrations of 3, 6, 12 and 30gL-1 were investigated. The three lower concentrations showed considerable biogas production, whereas the 30gL-1 dosage caused process inhibition. The highest methane yield of 199.1±18.5mLgCOD -1 (COD removal: 56.9±5.3%) was observed for the 330°C pyrolysis liquor, followed by the 430°C sample with only slightly lower values. The 530°C sample dropped to a yield of 129.3±19.7mLgCOD -1 (COD removal: 36.9±5.6%). Most VOCs contained in the pyrolysis liquor (i.e. furfural, phenol, catechol, guaiacol, and levoglucosan) were reduced below detection limit (cresol by 10-60%). Consequently, integrated pyrolysis and anaerobic digestion in addition to thermochemical conversion of digestate also promises bioconversion of pyrolysis liquors.

Original languageEnglish
Pages (from-to)86-92
Number of pages7
JournalBioresource technology
Volume183
DOIs
Publication statusPublished - 1 May 2015

Keywords

  • Anaerobic digestion
  • Biocrude
  • Detoxification
  • Process integration
  • Pyrolysis

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