Thermal pre-treatment: Getting some insights on the formation of recalcitrant compounds and their effects on anaerobic digestion

Research output: Contribution to journalArticlepeer-review

Abstract

Thermal hydrolysis is a common pre-treatment, used before anaerobic digestion processes, to enhance the hydrolysis rate. However, formation of inhibitory compounds and the increase of liquid fraction colour have been identified as potential drawbacks. This study was oriented to study the methane production from simple substrates, subjected to thermal hydrolysis. A mixture of glycine and glucose at different concentrations was prepared, at a ratio similar to proteins and carbohydrates found in activated sludge. Two temperatures were tested. At 120 °C a decrease on biogas production rate was observed. On the other hand, at 165 °C generation of recalcitrant material was observed, causing a decrease in methane potential and COD degradation, when a mixture of glycine and glucose was used as substrate. This was atributed to the formation of recalcitrant compounds via Maillard reaction, hyphothesis supported by FTIR-ATR, which indicated the formation of amide II Bonds.

Original languageEnglish
Article number111940
JournalJournal of Environmental Management
Volume282
DOIs
StatePublished - 15 Mar 2021
Externally publishedYes

Keywords

  • Anaerobic digestion
  • FTIR
  • Pre-treatment
  • Recalcitrant
  • Thermal hydrolysis

Fingerprint Dive into the research topics of 'Thermal pre-treatment: Getting some insights on the formation of recalcitrant compounds and their effects on anaerobic digestion'. Together they form a unique fingerprint.

Cite this