Conductive magnetite nanoparticles trigger syntrophic methane production in single chamber microbial electrochemical systems

Mung Thi Vu, Md Tabish Noori, Booki Min

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Performance of methane-producing microbial electrochemical systems (MESs) is highly reliant on electron transfer efficiency from electrode to microorganisms and vice versa. In this study, magnetite nanoparticles were used as electron carriers to enhance extracellular electron transfer in single chamber MESs. The MES with magnetite exhibited the highest methane yield and current generation of 0.37 ± 0.009 LCH4/gCOD and 9.6 mA, respectively among the tested reactors. The experimental data was observed to be highly consistent with modified Gompertz model results (R2 > 0.99), which also showed 74.2% and 22.1% enhanced methane production rate in MES with magnetite as compared to control AD and MES without magnetite, respectively. Cyclic voltammetry and electrochemical impedance spectroscopy analysis confirmed that magnetite enhanced catalytic activity of biofilm and lowered both solution and charge transfer resistance. Therefore, supplementing magnetite in MESs could be a strategy to develop an efficient syntrophic biomethanation in field scale applications.

Original languageEnglish
Article number122265
JournalBioresource Technology
Volume296
DOIs
Publication statusPublished - Jan 2020

Keywords

  • Electromethanogenesis
  • Magnetite nanoparticles
  • Methane yield
  • Microbial electrochemical system

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