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Maximizing the energy harvest from a microbial fuel cell embedded in a constructed wetland

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  • Xu, Lei
  • Wang, Bodi
  • Liu, Xiuhua
  • Yu, Wenzheng
  • Zhao, Yaqian

Abstract

Direct energy harvesting from the newly established constructed wetland-microbial fuel cell (CW-MFC) offers it a competitive position compared with traditional constructed wetlands (CWs) to allow the CWs for wastewater treatment and concomitantly achieve power generation. However, the integration of MFC into CWs always faces a large portion of energy losses due to the existence of higher internal resistance. This paper reports tests of a novel strategy, namely a capacitator engaged duty cycling (CDC) strategy, to harvest energy from an open air bio-cathode CW-MFC. Results show that with duty cycle value of 31.6% (D = 31.6%), the effective charge obtained from CDC strategy is 19.81% higher than the conventional continuous loading (CL) mode within the same discharging time. With a lower D value of 20% (D = 20%), the total charge harvested increased about 25.0%. The CDC operation mode shows advantages over the higher internal resistance system and contributes to a higher normalized COD removal rate. This operation strategy can minimize the energy losses with a suitable D value. It is a simple but effective way to maximize the energy harvesting from the CW-MFC system.

Suggested Citation

  • Xu, Lei & Wang, Bodi & Liu, Xiuhua & Yu, Wenzheng & Zhao, Yaqian, 2018. "Maximizing the energy harvest from a microbial fuel cell embedded in a constructed wetland," Applied Energy, Elsevier, vol. 214(C), pages 83-91.
    • Handle: RePEc:eee:appene:v:214:y:2018:i:c:p:83-91
    DOI: 10.1016/j.apenergy.2018.01.071
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    2. Christwardana, Marcelinus & Frattini, Domenico & Accardo, Grazia & Yoon, Sung Pil & Kwon, Yongchai, 2018. "Early-stage performance evaluation of flowing microbial fuel cells using chemically treated carbon felt and yeast biocatalyst," Applied Energy, Elsevier, vol. 222(C), pages 369-382.
    3. Christwardana, Marcelinus & Frattini, Domenico & Duarte, Kimberley D.Z. & Accardo, Grazia & Kwon, Yongchai, 2019. "Carbon felt molecular modification and biofilm augmentation via quorum sensing approach in yeast-based microbial fuel cells," Applied Energy, Elsevier, vol. 238(C), pages 239-248.
    4. Zhang, Ying & Liu, Mengmeng & Zhou, Minghua & Yang, Huijia & Liang, Liang & Gu, Tingyue, 2019. "Microbial fuel cell hybrid systems for wastewater treatment and bioenergy production: Synergistic effects, mechanisms and challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 103(C), pages 13-29.

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