Effects of foam nickel supplementation on anaerobic digestion: Direct interspecies electron transfer

Xiaobo Guo, Chihe Sun, Richen Lin, Ao Xia, Yun Huang, Xianqing Zhu, Pau Loke Show, Jerry D. Murphy

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Stimulating direct interspecies electron transfer with conductive materials is a promising strategy to overcome the limitation of electron transfer efficiency in syntrophic methanogenesis of industrial wastewater. This paper assessed the impact of conductive foam nickel (FN) supplementation on syntrophic methanogenesis and found that addition of 2.45 g/L FN in anaerobic digestion increased the maximum methane production rate by 27.4 % (on day 3) while decreasing the peak production time by 33 % as compared to the control with no FN. Cumulative methane production from day 2 to 6 was 14.5 % higher with addition of 2.45 g/L FN than in the control. Levels of FN in excess of 2.45 g/L did not show benefits. Cyclic voltammetry results indicated that the biofilm formed on the FN could generate electrons. The dominant bacterial genera in suspended sludge were Dechlorobacter and Rikenellaceae DMER64, whereas that in the FN biofilm was Clostridium sensu stricto 11. The dominant archaea Methanosaeta in the FN biofilm was enriched by 14.1 % as compared to the control.

Original languageBritish English
Article number122830
JournalJournal of Hazardous Materials
Volume399
DOIs
StatePublished - 15 Nov 2020

Keywords

  • Biofilm
  • Biogas
  • Direct interspecies electron transfer
  • Industrial wastewater
  • Methane production

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