Inhibition of N-Vanillylnonanamide in anaerobic digestion of lipids in food waste: Microorganisms damage and blocked electron transfer

Liangchen Yue, Jun Cheng, Haihua Zhang, Luyun Yuan, Junjie Hua, Haiquan Dong, Yu you Li, Junhu Zhou

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To study the inhibited degradation metabolism and anaerobic digestion of typical lipids in food waste, an artificially produced capsaicin, N-Vanillylnonanamide, a typical soluble component in waste lipids, was added to a glycerol trioleate anaerobic digestion system. The microorganisms damage and blocked electron transfer caused by N-Vanillylnonanamide during anaerobic digestion were further clarified. Scanning electron microscopy and transmission electron microscopy images demonstrated that N-Vanillylnonanamide (≥4 wt%) structurally damaged microorganisms via cell membrane breakage, which impair their function. N-Vanillylnonanamide inhibited the activities of the key enzyme CoA, AK, F420, and CoM, which are relevant for both degradation metabolism and anaerobic digestion. 16S rRNA analysis showed that dominant bacterial and archaeal communities markedly decreased after anaerobic digestion of glycerol trioleate with N-Vanillylnonanamide (≥4 wt%). For example, the proportion of Methanosarcina decreased from 30 % to 6 %. Current-voltage curves indicated that the electron transfer rate in the community of microorganisms decreased by 99 % from 4.67 × 10−2 to 5.66 × 10−4 s−1 in response to N-Vanillylnonanamide (40 wt%). The methane yield during anaerobic digestion of glycerol trioleate decreased by 84.0 % from 780.21–142.10 mL/g-total volatile solids with N-Vanillylnonanamide (40 wt%).

Original languageEnglish
Article number123098
JournalJournal of Hazardous Materials
Volume399
DOIs
Publication statusPublished - 2020 Nov 15

Keywords

  • Anaerobic digestion
  • Food waste
  • Glycerol trioleate
  • Inhibition
  • N-Vanillylnonanamide

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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