Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge
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...
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Tamkang University Press
2025-03-01
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| Series: | Journal of Applied Science and Engineering |
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| Online Access: | http://jase.tku.edu.tw/articles/jase-202510-28-10-0016 |
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| author | Maneerat Khemkhao Sengthong Lee Chantaraporn Phalakornkule Vichai Domrongpokkaphan |
| author_facet | Maneerat Khemkhao Sengthong Lee Chantaraporn Phalakornkule Vichai Domrongpokkaphan |
| author_sort | Maneerat Khemkhao |
| collection | DOAJ |
| description | 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 R^2 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. |
| format | Article |
| id | doaj-art-2f4944899dd542eb85f66be3319e2318 |
| institution | Kabale University |
| issn | 2708-9967 2708-9975 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Tamkang University Press |
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| series | Journal of Applied Science and Engineering |
| spelling | doaj-art-2f4944899dd542eb85f66be3319e23182025-08-20T03:39:54ZengTamkang University PressJournal of Applied Science and Engineering2708-99672708-99752025-03-0128102043204910.6180/jase.202510_28(10).0016Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludgeManeerat Khemkhao0Sengthong Lee1Chantaraporn Phalakornkule2Vichai Domrongpokkaphan3Rattanakosin College for Sustainable Energy and Environment, Rajamangala University of Technology Rattanakosin, Nakhon Pathom 73170, Thailand. Microbial Informatics and Industrial Product of Microbe Research Center, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandDepartment of Chemical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand. Research Center for Circular Products and Energy, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandDepartment of Chemical Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand. Research Center for Circular Products and Energy, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandMicrobial Informatics and Industrial Product of Microbe Research Center, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand. Department of Agro-Industrial, Food and Environmental Technology, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, ThailandReducing 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 R^2 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.http://jase.tku.edu.tw/articles/jase-202510-28-10-0016anaerobic conditionbioconversion of co2kinetic studyzero-valent iron |
| spellingShingle | Maneerat Khemkhao Sengthong Lee Chantaraporn Phalakornkule Vichai Domrongpokkaphan Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge Journal of Applied Science and Engineering anaerobic condition bioconversion of co2 kinetic study zero-valent iron |
| title | Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge |
| title_full | Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge |
| title_fullStr | Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge |
| title_full_unstemmed | Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge |
| title_short | Experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of CO2 into CH4 by anaerobic sludge |
| title_sort | experimental and kinetic analysis of the addition of zerovalent iron for promoting conversion of co2 into ch4 by anaerobic sludge |
| topic | anaerobic condition bioconversion of co2 kinetic study zero-valent iron |
| url | http://jase.tku.edu.tw/articles/jase-202510-28-10-0016 |
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