Active harvesting enhances energy recovery and function of electroactive microbiomes in microbial fuel cells

Lu Lu, Fernanda Leite Lobo, Defeng Xing, Zhiyong Jason Ren

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The performance of microbial fuel cells in terms of current production and waste removal depends on microbial electron transfer catalyzed by functional communities. Active energy harvesting using tunable electrical circuits in this study dramatically increased microbial fuel cell performance compared with passive harvesting using resistors. Operated under four different conditions under either high power or high current, active harvesting increased power output by up to 240%, current output by 45%, and Coulombic efficiency by 141%. Moreover, the dynamic harvesting created a selective pressure on the anodic biofilm and greatly shaped the microbial community and function. It promoted the enrichment of electroactive bacteria with higher efficiency of electron transfer and thereby improved reactor performance. Using both marker gene sequencing and metagenomics tools, the study revealed distinct clusters of microbial community on the anodic biofilm under different harvesting conditions, and the abundance of known electroactive bacteria Geobacter more than tripled in active harvesting condition. Similar trends were discovered in the increased abundance of c-type cytochrome genes associated with extracellular electron transfer. Statistical analysis showed strong positive correlations between the abundance of functional genes and electrochemical performance of reactors. Compared with 16S rRNA marker gene methods that only examine the general microbial community structure, metagenomics used here revealed more accurate structure information as well as the functions of microbial community.

Original languageEnglish (US)
Pages (from-to)492-502
Number of pages11
JournalApplied Energy
Volume247
DOIs
StatePublished - Aug 1 2019

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

Keywords

  • Active energy-harvesting
  • Metagenomics
  • Microbial community
  • Microbial electrochemical technology
  • Microbial fuel cell
  • Wastewater treatment

Fingerprint Dive into the research topics of 'Active harvesting enhances energy recovery and function of electroactive microbiomes in microbial fuel cells'. Together they form a unique fingerprint.

  • Cite this