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Natural solar intermittent-powered electromethanogenesis towards green carbon reduction

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

DOI

  • Bo Wang
  • Wenzong Liu, Harbin Institute of Technology
    • ,
  • Yifeng Zhang, Danmarks Tekniske Universitet
    • ,
  • Aijie Wang, Harbin Institute of Technology

Microbial electromethanogenesis (EM), as a sustainable bioderived carbon-neutrality catalyzing platform, can be accelerated and regulated by weak power input for carbon fixation into value-added bioenergy. Solar electricity as a day-night intermittent renewable resource has been verified to effectively drive microbes to capture carbon dioxide (CO2). However, understanding the influence mechanisms of higher CO2 loading on EM is of intrinsic significance yet lacking. Herein, natural solar-powered bioelectrocatalytic CO2 reduction to methane (CH4) under increasing bicarbonate concentrations was investigated. CH4 recovery for the long-term measurement showed that CH4 production rate positively responded to improved bicarbonate concentrations from 2.5 to 10.0 g HCO3−·L−1, exhibiting a robust and potent competence in CH4 yield compared to reported EM. Whereas exceed bicarbonate mainly contributed to raised pH in the solution resulting in the proton limitation despite the intermittent driven-mode could mitigate pH shock. Electrochemistry results demonstrated that higher bicarbonate concentrations promoted the redox activity of electrode biofilm and lowered the system resistances, especially the charge transfer resistance. Adequately improving CO2 loading can dynamically optimize the structure of anodic electroactive microorganisms and facilitate electron transfer. Furthermore, more functional cathodic mcrA genes were upregulated with elevated bicarbonates and the species of basophilic Methanobacterium alcaliphilum occupied predominated at the cathode. These findings open up a perspective avenue to carbon reduction using natural solar intermittent-powered EM.

OriginalsprogEngelsk
Artikelnummer134369
TidsskriftChemical Engineering Journal
Vol/bind432
ISSN1385-8947
DOI
StatusUdgivet - 15 mar. 2022

Bibliografisk note

Funding Information:
The authors would like to express their gratitude to Dr. Xiaolan Zhang from the Institute of Microbiology, Chinese Academy of Sciences for helping with the biofilm analysis, and Mr. Zhe Yu, from the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences for assisting with the TOC test. The authors would also like to thank Prof. Dr. Barth F Smets, Dr. Marlene Mark Jensen, and Dr. Arnaud Dechesne from the Department of Environmental Engineering, Technical University of Denmark, for valuable comments on the data analysis and preliminary version of the manuscript. This research was financially supported by the Natural Science Foundation of Guangdong Province for Distinguished Young Scientists (No. 2021B1515020084), the National Natural Science Foundation of China (No. 51778607), and the Shenzhen Science and Technology Innovation Program (No. KQTD20190929172630447).

Funding Information:
The authors would like to express their gratitude to Dr. Xiaolan Zhang from the Institute of Microbiology, Chinese Academy of Sciences for helping with the biofilm analysis, and Mr. Zhe Yu, from the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences for assisting with the TOC test. The authors would also like to thank Prof. Dr. Barth F Smets, Dr. Marlene Mark Jensen, and Dr. Arnaud Dechesne from the Department of Environmental Engineering, Technical University of Denmark, for valuable comments on the data analysis and preliminary version of the manuscript. This research was financially supported by the Natural Science Foundation of Guangdong Province for Distinguished Young Scientists (No. 2021B1515020084), the National Natural Science Foundation of China (No. 51778607), and the Shenzhen Science and Technology Innovation Program (No. KQTD20190929172630447).

Publisher Copyright:
© 2021 Elsevier B.V.

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