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A biocompatible composite anode made of sodium alginate/agar/activated carbon composite is used in microbial fuel cells, resulting in improved power performance and wastewater treatment.

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What they did

System
MFC

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Abstract

Abstract Microbial fuel cells (MFCs) are a potential biotechnology for simultaneous degradation of organic wastewater and power generation. In this paper, a biocompatible composite is constructed around a copper mesh with sodium alginate/agar and activated carbon (CM‐SA/AC) and acts as an efficient anode for MFCs after being microbe immobilized. The power performance of the MFC with CM‐SA/AC anode is investigated. The results show that the addition of activated carbon is conducive to the immobilization of bacteria on CM‐SA/AC anode and fast start‐up of MFCs. The power density reaches 1088.6 mW/m 2 , which is 2.03 times and 1.75 times that of CM‐SA (without activated carbon) anode and carbon felt anode, respectively. In case of a candied wastewater treatment, the MFC with immobilized CM‐SA/AC anode exhibits a much higher power density (724.5 mW/m 2 ) than that with carbon felt anode (145.0 mW/m 2 ), together with a longer stabilization time and a smaller charge‐transfer resistance. The total removal rate of chemical oxygen demand (COD) reaches 79.4 ± 0.65%. The present study will facilitate the development of inexpensive and biocompatible anodes to facilitate the application of MFCs in wastewater treatment.

Key findings

  • The power density of the MFC with CM-SA/AC anode is 1088.6 mW/m², which is 2.03 times and 1.75 times that of CM-SA and carbon felt anodes, respectively.
  • The MFC with immobilized CM-SA/AC anode exhibits a higher power density (724.5 mW/m²) and longer stabilization time compared to the carbon felt anode.
  • The total removal rate of chemical oxygen demand (COD) reaches 79.4 ± 0.65%.

Keywords

Microbial fuel cellAnodeActivated carbonCarbon fibersWastewaterChemical engineering

Identifiers

DOI
10.1002/app.53999
Journal
Journal of Applied Polymer Science
Year
2023