Maneerat Khemkhao1,2, Sengthong Lee3,4, Chantaraporn Phalakornkule3,4, and Vichai Domrongpokkaphan2,5This email address is being protected from spambots. You need JavaScript enabled to view it.
1Rattanakosin College for Sustainable Energy and Environment, Rajamangala University of Technology Rattanakosin, Nakhon Pathom 73170, Thailand
2Microbial Informatics and Industrial Product of Microbe Research Center, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
3Department of Chemical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
4Research Center for Circular Products and Energy, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
5Department of Agro-Industrial, Food and Environmental Technology, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
Received: July 13, 2024 Accepted: December 17, 2024 Publication Date: February 8, 2025
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Reducing greenhouse gas (GHG) emissions and sequestering carbon dioxide (CO2) can be achieved by a reduction of CO2 to methane (CH4) for renewable energy production. This study used zero-valent iron (ZVI) as an electron donor to reduce CO2 to CH4 at different ZVI concentrations (16, 32, 64, 96, and 224 g/L). The experimental CO2 consumption rates for the reactor with 16,32,64,96, and 224 g/L ZVI were 6.880, 5.438, 7.384, 8.309, and 8.051mmol/d · Lreactor, respectively. The CO2 reduction kinetics was analyzed using four models (Cone, Gompertz, Logistic, and Richards equations). The four models, especially the Richards equation, satisfactorily fitted the experimental data with an R2 of 0.990 − 0.998. The derived kinetic parameters reflected the experimental results, which showed that the lag phase for methane production decreased with increasing ZVI concentrations. The other characteristics of the system were: (1) the ZVI addition caused the increase in pH of the media; (2) there was a competition between methanogens and other metabolic pathways, especially at relatively high pH; and (3) relatively high ZVI concentrations induced the production of acetate and propionate.
Keywords: anaerobic condition; bioconversion of CO2; kinetic study; zero-valent iron
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