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In-situ biogas upgrading with H-2 addition in an anaerobic membrane bioreactor (AnMBR) digesting waste activated sludge
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| Title: | In-situ biogas upgrading with H-2 addition in an anaerobic membrane bioreactor (AnMBR) digesting waste activated sludge |
| Authors: | Hafuka, Akira Browse this author | | Fujino, Sota Browse this author | | Kimura, Katsuki Browse this author →KAKEN DB | | Oshita, Kazuyuki Browse this author | | Konakahara, Naoya Browse this author | | Takahashi, Shigetoshi Browse this author |
| Keywords: | Biomethanation | | Power to gas | | Anaerobic digestion | | Mesophilic | | Sewage sludge | | Membrane fouling |
| Issue Date: | 1-Jul-2022 |
| Publisher: | Elsevier |
| Journal Title: | Science of the total environment |
| Volume: | 828 |
| Start Page: | 154573 |
| Publisher DOI: | 10.1016/j.scitotenv.2022.154573 |
| Abstract: | Biological in-situ biogas upgrading is a promising approach for sustainable energy-powered technologies. This method increases the CH4 content in biogas via hydrogenotrophic methanogenesis with an external H-2 supply. In this study, an anaerobic membrane bioreactor (AnMBR) was employed for in-situ biogas upgrading. The AnMBR was operated in semi-batch mode using waste activated sludge as the substrate. Pulsed H-2 addition into the reactor and biogas recirculation effectively increased the CH4 content in the biogas. The addition of 4 equivalents of H-2 relative to CO2 did not lead to appreciable biogas upgrading, although the acetate concentration increased significantly. When 11 equivalents of H-2 were introduced, the biogas was successfully upgraded, and the CH4 content increased to 92%. The CH4 yield and CH4 production rate were 0.31 L/g-VSinput and 0.086 L/L/d, respectively. In this phase of the process, H-2 addition increased the acetate concentration and the pH because of CO2 depletion. Compared with a continuously-stirred tank reactor, the AnMBR system attained higher CH4 content, even without the addition of H-2. The longer solid retention time (100 d) in the AnMBR led to greater degradation of volatile solids. Severe membrane fouling was not observed, and the transmembrane pressure remained stable under 10 kPa for 117 d of continuous filtration without cleaning of the membrane. The AnMBR could be a promising reactor configuration to achieve in-situ biogas upgrading during sludge digestion. |
| Rights: | © <2022>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | | https://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/91289 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 羽深 昭
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