著者

Yuko Goto Naoko Yoshida

出版者

公益財団法人 応用微生物学・分子細胞生物学研究奨励会

雑誌

The Journal of General and Applied Microbiology (ISSN:00221260)

巻号頁・発行日

pp.2016.10.001, (Released:2017-05-02)

参考文献数

31

被引用文献数

15

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Anodes are crucial in determining the electricity recovery of microbial fuel cells (MFCs). In this study, graphene oxide (GO) was used as an anodic material for electricity recovery from artificial dialysis wastewater (ADWW). Anaerobic incubation of ADWW with GO for 21 days produced a hydrogel complex containing embedded microbial cells and microbially reduced GO (rGO). The rGO complex recovered 540 to 810 μA/cm3 of catalytic current from ADWW after 10 days of electrochemical cultivation at 200 mV (vs. Ag/AgCl), which was approximately thirty times higher than that recovered from graphite felt (GF), a representative anode in MFCs. High-throughput sequencing analysis of prokaryotic 16S rRNA genes revealed a predominance of the Geobacter genus (35% of all prokaryotic sequences identified), particularly in the rGO complex after 20 days of polarization. The superior electricity recovery of the rGO complex was attributable to enhanced direct electron transfer via a well-developed biofilm, while indirect electron transfer via an electron mediator occurred in culture using GF.

著者

Wataru Nagahashi Naoko Yoshida

出版者

Applied Microbiology, Molecular and Cellular Biosciences Research Foundation

雑誌

The Journal of General and Applied Microbiology (ISSN:00221260)

巻号頁・発行日

pp.2021.05.001, (Released:2021-08-31)

参考文献数

52

被引用文献数

6

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In this study, two fibrous carbon anodes (namely, pleated non-woven graphite (PNWG) and carbon brush (CB) made from artificial carbon) and bamboo charcoal (BC) were evaluated for current recovery from sewage wastewater. When these anodes were polarized at 0.2 V vs. Ag/AgCl in sewage wastewater, CB produced a maximum current of 2.9 A/m2. This exceeded that produced by PNWG (1.5 A/m2) and BC (1.4 A/m2). The accumulative charge recovery achieved with CB was superior to those achieved with the other two (1.6- and 2.2-fold higher than that with PNWG and BC, respectively). During the cyclic voltammetry analysis, CB demonstrated the highest catalytic current with maximum potential in the range of –0.6 to 0.4 V vs. Ag/AgCl and the smallest anode resistance (0.20 Ωm2). Direct cell counting revealed that the fibrous anodes (CB and PNWG) attached most of the cells in the anodes (80%), whereas BC did not. In contrast, the proportion of Geobacter species, a representative electrogenic microorganism in the total bacteria, was observed to be similar among the three anodes (4.4–5.8%). The tubular microbial fuel cell (ø 5.0 cm) equipped with an air-chamber core wrapped with an anion exchange membrane (AEM) and the CB delivered a current of 1.8 A/m2. This is higher than those reported in the existing literature for the same microbial fuel cell (MFC) configuration. This indicates that the alteration of the anode from planar to brush can contribute toward improving the current recovery through the air-cathode-AEM-MFC. The BC needs improvement to have more specific surface area, whereas it showed superiority in cost efficiency considering material and processing.

著者

吉田 如子 Naoko Yoshida 明治大学客員

雑誌

社会安全・警察学 = Criminal justice and policing (ISSN:21885680)

巻号頁・発行日

vol.2, pp.1-16, 2015-12

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はじめに1.警察と警察活動――Islington Crime Survey でほぼ決着した理念論争2.正統性追求、警察官職業文化と女性警察官3.日比女性警察官調査から窺えること――英米の経験的研究を踏まえて結びにかえて