Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity
Straw biochar prepared by three methods (i.e., pyrochar, HNO<sub>3</sub>-modified pyrochar, and hydrochar) was added to the anaerobic digestion system with acetic acid and ethanol as substrates to explore the effects of biochar on methane production, substrate degradation, and microbial...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Fermentation |
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| Online Access: | https://www.mdpi.com/2311-5637/9/7/584 |
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| author | Yannan Ruan Yuze Jiang Moting Li Suyun Xu Jining Zhang Xuefeng Zhu Hongbo Liu |
| author_facet | Yannan Ruan Yuze Jiang Moting Li Suyun Xu Jining Zhang Xuefeng Zhu Hongbo Liu |
| author_sort | Yannan Ruan |
| collection | DOAJ |
| description | Straw biochar prepared by three methods (i.e., pyrochar, HNO<sub>3</sub>-modified pyrochar, and hydrochar) was added to the anaerobic digestion system with acetic acid and ethanol as substrates to explore the effects of biochar on methane production, substrate degradation, and microbial community structure. The biogas yields of the biochar-supplemented groups all increased, and the maximum methane yield was found in the hydrochar group, which was 45.4% higher than the control. In the ethanol-fed reactor, the maximum partial pressure of hydrogen in the headspace of the hydrochar reactor was reduced from 3.5% (blank reactor) to 1.9%. Overall, methane production is directly proportional to the electron exchange capacity (EEC) value of biochar. Furthermore, the bio-aging process increased the EEC of each kind of biochar to 5.5–8.1%, which was favorable for the sustainable promotion of methanogenesis. The increased methane yield from the bio-aged biochar could either be attributable to the changes in surface oxygen-containing functional groups or the selectively enriched microbial community on the biochar, such as <i>Geobacter</i>, which could participate in direct interspecies electron transfer. |
| first_indexed | 2024-03-11T01:06:07Z |
| format | Article |
| id | doaj.art-dabbac8d29f94626ada17a1239c085cc |
| institution | Directory Open Access Journal |
| issn | 2311-5637 |
| language | English |
| last_indexed | 2024-03-11T01:06:07Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fermentation |
| spelling | doaj.art-dabbac8d29f94626ada17a1239c085cc2023-11-18T19:15:27ZengMDPI AGFermentation2311-56372023-06-019758410.3390/fermentation9070584Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange CapacityYannan Ruan0Yuze Jiang1Moting Li2Suyun Xu3Jining Zhang4Xuefeng Zhu5Hongbo Liu6School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, ChinaShanghai Institute of Mechanical & Electrical Engineering Co., Ltd., Shanghai 200040, ChinaSchool of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, ChinaEco-Environmental Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201106, ChinaSchool of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, ChinaSchool of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, ChinaStraw biochar prepared by three methods (i.e., pyrochar, HNO<sub>3</sub>-modified pyrochar, and hydrochar) was added to the anaerobic digestion system with acetic acid and ethanol as substrates to explore the effects of biochar on methane production, substrate degradation, and microbial community structure. The biogas yields of the biochar-supplemented groups all increased, and the maximum methane yield was found in the hydrochar group, which was 45.4% higher than the control. In the ethanol-fed reactor, the maximum partial pressure of hydrogen in the headspace of the hydrochar reactor was reduced from 3.5% (blank reactor) to 1.9%. Overall, methane production is directly proportional to the electron exchange capacity (EEC) value of biochar. Furthermore, the bio-aging process increased the EEC of each kind of biochar to 5.5–8.1%, which was favorable for the sustainable promotion of methanogenesis. The increased methane yield from the bio-aged biochar could either be attributable to the changes in surface oxygen-containing functional groups or the selectively enriched microbial community on the biochar, such as <i>Geobacter</i>, which could participate in direct interspecies electron transfer.https://www.mdpi.com/2311-5637/9/7/584anaerobic digestionbiocharelectron exchange capacitiesethanolhydrochar |
| spellingShingle | Yannan Ruan Yuze Jiang Moting Li Suyun Xu Jining Zhang Xuefeng Zhu Hongbo Liu Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity Fermentation anaerobic digestion biochar electron exchange capacities ethanol hydrochar |
| title | Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity |
| title_full | Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity |
| title_fullStr | Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity |
| title_full_unstemmed | Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity |
| title_short | Straw Biochar-Facilitated Methanogenesis from Acetic Acid and Ethanol: Correlation with Electron Exchange Capacity |
| title_sort | straw biochar facilitated methanogenesis from acetic acid and ethanol correlation with electron exchange capacity |
| topic | anaerobic digestion biochar electron exchange capacities ethanol hydrochar |
| url | https://www.mdpi.com/2311-5637/9/7/584 |
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