A single microbial electrochemical system for CO2 reduction and simultaneous biogas purification, upgrading and sulfur recovery

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Liang Huang
  • Hou-Qi Liu
  • Zhou-Liang Tan
  • Wen-Wei Li


Original languageEnglish
Article number122448
Journal / PublicationBioresource Technology
Online published18 Nov 2019
Publication statusPublished - Feb 2020


In this work, a single microbial electrochemical system was developed for multiple goals simultaneously – CO2 reduction, biogas purification, upgrading and sulfur recovery. This system consists of a methanogen-inoculated biocathode for CO2 reduction and a ferrous ion (Fe2+)-mediated abiotic anode for hydrogen sulfide (H2S) oxidation. In the cathodic chamber, methane production rate of 20.6 ± 1.0 μmol·h−1 and high upgrading level (up to 98.3% methane content) were achieved. In the anodic chamber, H2S was completely removed and selectively converted into elemental sulfur particles. The system showed stable performance during continuous operation for treating both pure CO2 and mixed gases, with a cathodic coulombic efficiency of up to 85.2%. This simple system holds a great potential for practical application for biogas upgrading and sulfur recovery from waste water/gases.

Research Area(s)

  • Biogas upgrading, Elemental sulfur, CO2 reduction, Methanococcus maripaludis

Citation Format(s)