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Researchers optimized the anode structure in sediment microbial fuel cells to improve in-situ remediation of river sediment, achieving higher pollutant removal and electricity generation.

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What they did

System
MFC

What worked

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Abstract

Abstract Six 60-L benthic microbial electrochemical systems (BMES) were built for the bioremediation of river sediment. Carbon mesh anodes with honeycomb-structure supports were compared with horizontal anodes, and the system was tested using different cover depths and anode densities. The pollutant removal, electricity generation, and electrochemistry of the six BMES with different anodes was examined using the Ashi River (Harbin, China) as a case study. Total organic carbon (TOC) and total nitrogen (TN) removal from sediments in BMES with three-dimensional anodes were 20%~30% and 20%~33% higher for the other reactors. Moreover, the honeycomb-structure of the anode also resulted in higher power density and improved humus removal.

Key findings

  • Three-dimensional anodes with honeycomb-structure supports showed 20-30% higher TOC removal and 20-33% higher TN removal compared to horizontal anodes.
  • Honeycomb-structure anodes resulted in higher power density and improved humus removal.
  • The optimized anode structure improved the overall remediation effect of the sediment microbial fuel cells.

Keywords

Environmental remediationMicrobial fuel cellIn situSedimentAnodeWaste management

Identifiers

DOI
10.21203/rs.3.rs-1014336/v1
Journal
Research Square
Year
2021