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https://hdl.handle.net/20.500.14094/90007839
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2024-04-19
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90007839 (fulltext)
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メタデータID
90007839
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open access
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タイトル
Enhanced methane production from cellulose using a two-stage process involving a bioelectrochemical system and a fixed film reactor
著者
Sasaki, Kengo ; Sasaki, Daisuke ; Tsuge, Yota ; Morita, Masahiko ; Kondo, Akihiko
著者ID
A0278
研究者ID
1000050558301
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=543788ae48fc1b54520e17560c007669
著者名
Sasaki, Kengo
佐々木, 建吾
ササキ, ケンゴ
所属機関名
科学技術イノベーション研究科
著者ID
A0276
研究者ID
1000000650615
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=983adcb634cd583a520e17560c007669
著者名
Sasaki, Daisuke
佐々木, 大介
ササキ, ダイスケ
所属機関名
科学技術イノベーション研究科
著者名
Tsuge, Yota
著者名
Morita, Masahiko
著者ID
A1715
研究者ID
1000040205547
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=a324eb4a1b052e53520e17560c007669
著者名
Kondo, Akihiko
近藤, 昭彦
コンドウ, アキヒコ
所属機関名
科学技術イノベーション研究科
収録物名
Biotechnology for Biofuels
巻(号)
14(1)
ページ
7-7
出版者
BMC
刊行日
2021-01-06
公開日
2021-02-05
抄録
Background It is desirable to improve the anaerobic digestion processes of recalcitrant materials, such as cellulose. Enhancement of methane (CH4) production from organic molecules was previously accomplished through coupling a bioelectrochemical system (BES); however, scaling-up BES-based production is difficult. Here, we developed a two-stage process consisting of a BES using low-cost and low-reactive carbon sheets as the cathode and anode, and a fixed film reactor (FFR) containing conductive material, i.e., carbon fiber textiles (CFTs) (:BES → FFR). By controlling the cathodic current at 2.7 μA/cm2 without abiotic H2 production, the three-electrode BES system was operated to mimic a microbial electrolysis cell. Results The thermophilic BES (inlet pH: 6.1) and FFR (inlet pH: 7.5) were operated using hydraulic retention times (HRTs) of 2.5 and 4.2 days, respectively, corresponding to a cellulose load of 3555.6 mg-carbon (C)/(L day). The BES → FFR process achieved a higher CH4 yield (37.5%) with 52.8 vol% CH4 in the product gas compared to the non-bioelectrochemical system (NBES) → FFR process, which showed a CH4 yield of 22.1% with 46.8 vol% CH4. The CH4 production rate (67.5 mM/day) obtained with the BER → FFR process was much higher than that obtained using electrochemical methanogenesis (0.27 mM/day). Application of the electrochemical system or CFTs improved the yields of CH4 with the NBES → FFR or BES → non-fixed film reactor process, respectively. Meta 16S rRNA sequencing revealed that putative cellulolytic bacteria (identified as Clostridium species) were present in the BES and NBES, and followed (BES→ and NBES→) FFR. Notably, H2-consuming methanogens, Methanobacterium sp. and Methanosarcina sp., showed increased relative abundances in the suspended fraction and attached fraction of (BES→) FFR, respectively, compared to that of (NBES→) FFR, although these methanogens were observed at trace levels in the BES and NBES. Conclusions These results indicate that bioelectrochemical preprocessing at a low current effectively induces interspecies H2 transfer in the FFR with conductive material. Sufficient electrochemical preprocessing was observed using a relatively short HRT. This type of two-stage process, BES → FFR, is useful for stabilization and improvement of the biogas (CH4) production from cellulosic material, and our results imply that the two-stage system developed here may be useful with other recalcitrant materials.
キーワード
Bioelectrochemical system
Fixed film reactor
Two-stage process
Methane
Hydrogenotrophic methanogen
Cellulose
カテゴリ
科学技術イノベーション研究科
学術雑誌論文
権利
© The Author(s) 2021.
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.
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資源タイプ
journal article
言語
English (英語)
eISSN
1754-6834
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関連情報
DOI
https://doi.org/10.1186/s13068-020-01866-x
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