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

Ortega-Martinez, E.; Chamy, R.; Jeison, D.

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 degrees C a decrease on biogas production rate was observed. On the other hand, at 165 degrees 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.

Más información

Título según WOS: Thermal pre-treatment: Getting some insights on the formation of recalcitrant compounds and their effects on anaerobic digestion
Título de la Revista: JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volumen: 282
Editorial: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Fecha de publicación: 2021
DOI:

10.1016/j.jenvman.2021.111940

Notas: ISI