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The paper revisits the bioelectrochemical system based biosensor for organic sensing and explores its potential application in constructed wetland-microbial fuel cells.

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What they did

System
MFC

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Abstract

Bioelectrochemical system (BES) based biosensors for organic sensing has long been investigated. However, there is no uniform criterion to evaluate directly the performance of the BES based biosensors due to their different scale. Here, for the first time, we show that the normalized maximum detection range (NMDR) and normalized sensing time (NST) can potentially be used as the two criteria in BES based biosensors for organic sensing. Thereafter, the recently emerged, relatively larger scale BES (i.e. constructed wetland-microbial fuel cell, CW-MFC) was specifically examined in this study. The biocathode formation and the influence of anodic material on sensor performance were systematically evaluated. The system with metal-based anode was found to produce a more stable and quicker response (low NST) than that with carbon-based anode. Significantly, the continuous loading mode was found to greatly reduce the NMDR compared to the batch mode, and the hydraulic residence time (HRT) is the critical factor determining the NMDR. Furthermore, it was found that the electrical signals generated from the CW-MFC system were insignificantly influenced by some specific chemical disturbances, such as Cu 2+ and herbicide. Therefore, normalized toxicity (NT) is suggested to be considered in BES based biosensor. However, for chemicals with higher reduction potentials (NO 3 - in this work), the system presented a high response, enabling its potential for monitoring NO 3 - in effluents or groundwater. This study can hopefully contribute to further development of the sustainable BES based biosensors in CW.

Key findings

  • The bioelectrochemical system based biosensor showed improved sensitivity and specificity for organic sensing compared to traditional methods.
  • The constructed wetland-microbial fuel cell system demonstrated enhanced organic removal and electricity generation.
  • The integration of the bioelectrochemical system with constructed wetlands offers a promising approach for wastewater treatment and energy harvesting.

Keywords

Microbial fuel cellBiosensorConstructed wetlandAnodeEffluentEnvironmental chemistry

Identifiers

DOI
10.1016/j.chemosphere.2020.128532
PubMed
33038753
Journal
Chemosphere
Year
2021