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Researchers converted activated sludge into high-value materials, improving microbial fuel cell performance with a carbonized anode.

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What they did

System
MFC

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Abstract

The conversion of activated sludge into high value-added materials, such as sludge carbon (SC), has attracted increasing attention because of its potential for various applications. In this study, the effect of SC carbonized at temperatures of 600, 800, 1000, and 1200 °C on the anode performance of microbial fuel cells and its mechanism are discussed. A pyrolysis temperature of 1000 °C for the loaded electrode (SC1000/CC) generated a maximum areal power density of 2.165 ± 0.021 W·m⁻² and a current density of 5.985 ± 0.015 A·m⁻², which is 3.017- and 2.992-fold that of the CC anode. The addition of SC improves microbial activity, optimizes microbial community structure, promotes the expression of c-type cytochromes, and is conducive to the formation of electroactive biofilms. This study not only describes a technique for the preparation of high-performance and low-cost anodes, but also sheds some light on the rational utilization of waste resources such as aerobic activated sludge.

Key findings

  • A pyrolysis temperature of 1000 °C generated a maximum areal power density of 2.165 ± 0.021 W·m⁻² and a current density of 5.985 ± 0.015 A·m⁻².
  • The addition of SC improves microbial activity, optimizes microbial community structure, and promotes electroactive biofilms.
  • The SC1000/CC anode showed 3.017- and 2.992-fold improvement in power and current density compared to the CC anode.

Keywords

Microbial fuel cellAnodeMicrobial population biologyCarbon fibersDynamics (music)Pulp and paper industry

Identifiers

DOI
10.3390/membranes12020120
Journal
Membranes
Year
2022