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A real-time voltage data acquisition system was developed for a plant-based microbial fuel cell, and the results showed that the plant-MFC generated higher bioelectricity than a control MFC.

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Single-chamber air-cathode MFCRepresentative model
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Representative single-chamber air-cathode MFC — matched on the paper’s reported configuration, not its exact geometry.

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What they did

System
MFC
Substrate
complex media
Inoculum
electrochemically active bacteria (EABs)

What worked

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Abstract

Plant microbial fuel cell (Plant-MFC) is an emerging technology that uses the metabolic activity of electrochemically active bacteria (EABs) to continue the production of bioelectricity. Since its invention and to date, great efforts have been made for its application both in real-time and large-scale. However, the construction of platforms or systems for automatic voltage monitoring has been insufficiently studied. Therefore, this study aimed to develop an automatic real-time voltage data acquisition system, which was coupled with an ATMEGA2560 connected to a personal computer. Before the system operation started it was calibrated to obtain accurate data. During this experiment, the power generation performance of two types of reactors i.e. (i) Plant-MFC and (ii) control microbial fuel cell (C-MFC), was evaluated for 15 days. The Plant-MFC was planted with an herbaceous perennial plant (Stevia rebaudiana), electrode system was placed close to the plant roots at the depth of 20 cm. The results of the study have indicated that the Plant-MFC, was more effective and achieved higher bioelectricity generation than C-MFC. The maximum voltage reached with Plant-MFC was 850 mV (0.85 V), whereas C-MFC achieved a maximum voltage of 762 mV (0.772 V). Furthermore, the same reactor demonstrated a maximum power generation of 66 mW m¯2 on 10 min of polarization, while a power density with C-MFC was equal to 13.64 mW m¯2. S.rebaudiana showed a great alternative for power generation. In addition, the monitoring acquisition system was suitable for obtaining data in real-time. However, more studies are recommended to enhance this type of system.

Key findings

  • The maximum voltage reached with Plant-MFC was 850 mV.
  • The Plant-MFC was more effective and achieved higher bioelectricity generation than C-MFC.
  • The study evaluated the power generation performance of two types of reactors for 15 days.

Keywords

Microbial fuel cellData acquisitionVoltagePower stationElectricity generationSupercapacitor

Identifiers

DOI
10.18006/2022.10(2).387.395
Journal
Journal of Experimental Biology and Agricultural Sciences
Year
2022