Enhanced biogas production and biodegradation of phenanthrene in wastewater sludge treated anaerobic digestion reactors fitted with a bioelectrode system

Chaoba Lin, Ping Wu, Yongdi Liu, Jonathan W C WONG, Xiaoyu Yong, Xiayuan Wu, Xinxin Xie, Honghua Jia, Jun Zhou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The purpose of this study was to investigate the enhanced biogas production and biodegradation of phenanthrene in sludge treated anaerobic digestion (AD) reactors fitted with a bioelectrode system (AD-MEC reactors). Different cathodes were considered for installation in the AD-MEC reactor. The result showed that the maximum methane yield (113.45 L/kg TS) and the highest phenanthrene degradation rate (52.3%) were obtained in a reactor with a carbon paper (CP) cathode; this performance was 30.5% and 83.5% greater, respectively, than that in the AD control reactor. Clostridia spp., bacteria that degrade pollutants, were specifically adsorbed onto the electrodes, and Methanosaeta spp. and Geobacter spp. were enriched on the anode. These results implied that a potential direct electron transfer occurred between Methanosaeta and Geobacter. Two hydrogenotrophic methanogens (Methanospirillum spp. and Methanobacterium spp.) were enriched on the surface of the cathode, which enhanced interspecies H2 transfer in the AD-MEC reactors.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalChemical Engineering Journal
Volume365
DOIs
Publication statusPublished - 1 Jun 2019

Scopus Subject Areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

User-Defined Keywords

  • Anaerobic digestion
  • Methane
  • Microbial community
  • Microbial electrolysis cell (MEC)
  • Phenanthrene
  • Wastewater sludge

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