Adjustable bidirectional extracellular electron transfer between Comamonas testosteroni biofilms and electrode via distinct electron mediators

Yu, Yangyang; Wu, Yichao; Cao, Bin; Gao, Yong‐Gui; Yan, Xiaoli

doi:10.1016/j.elecom.2015.07.007

Cited by 52 publications

(25 citation statements)

References 26 publications

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“…The bidirectional electron transfer of the exoelectrogenic Comamonas. sp also had been reported, which had different routes for inward and outward electron transfer(Yu et al, 2015). In contrast, Desulfovibrio, Pseudomonas, Petrimonas and Dysgonomonas had increased by 2.04, 1.43, 1.47 and 1.88 times, respectively.…”

mentioning

confidence: 98%

Response of anodic bacterial community to the polarity inversion for chloramphenicol reduction

Yun

Kong

Liang

et al. 2016

Bioresource Technology

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Chloramphenicol (CAP) is a frequently detected environmental pollutant. In this study, an electroactive biofilm for CAP reduction was established by initially in the anode and then inverting to the cathode. The established biocathode could enhance the reduction of CAP to the nitro-group reduced CAP (AMCl2) and further dechlorinated form (AMCl), both had lost the antibacterial activity. The phylogenetic diversity of the acclimated biofilm was decreased after the polar inversion. Proportions of functional bacterial genera, including Geobacter, Desulfovibrio and Pseudomonas responsible for the bidirectional electron transfer and nitroaromatics reduction, had increased 28%, 104% and 43% in the cathode. The relatively high abundances (over 50%) of Geobacter in anode and cathode were rarely detected for the nitroaromatics reduction. This study provides new insights into the electroactive biofilm structure improvement by the polarity inversion strategy for refractory antibiotics degradation.

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mentioning

confidence: 98%

Response of anodic bacterial community to the polarity inversion for chloramphenicol reduction

Yun

Kong

Liang

et al. 2016

Bioresource Technology

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“…system have been observed (Xing, Cheng et al 2010). Interestingly, Comamonas was found to colonize on both anodic and biocathodic electrode which indicate a bidirectional extracellular electron transfer (Yu, Wu et al 2015). As cathodic strains can consume electrode from anode, biocathode with Comamonas can be used to replace the abiotic catalyst or electron mediator which reducing the cost and increasing operational sustainability (He and Angenent 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Different from Shewanella strains (Kim, Ikeda et al 1999), the redox species from C. testosteroni can facilitate outward electron transfer under both aerobic and anaerobic conditions. The ability of using alternative solid electron acceptors, like electrode and Fe(III) minerals, was also found to benefit the associated Comamonas biofilms by enhancing their growth and viability (Wu, Zhuang et al 2010, Xing, Cheng et al 2010, Yu, Wu et al 2015. Besides nutrient levels, stress inducers and toxic compounds also affect biofilm formation.…”

Section: Environmental Factors Influencing Biofilm Lifestylementioning

confidence: 99%

“…Comamonas biofilms were found to be enriched in bioprocesses with intermittent aeration (e.g. EBPR reactors) (Liu, Zhang et al 2005, Zengin, Artan et al 2011 Comamonas strains were also found to be able to respire on nitrate, solid mineral and electrode (Gumaelius, Magnusson et al 2001, Wu, Zhuang et al 2010, Yu, Wu et al 2015. In microbial fuel cells, Comamonas was enriched and dominant on anode electrodes when fed with acetate and aniline (Xing, Cheng et al 2010, Cheng, Liang et al 2015, Miyahara, Kouzuma et al 2015, Jiang, Xing et al 2016.…”

Section: Environmental Factors Influencing Biofilm Lifestylementioning

confidence: 99%

“…In microbial fuel cells, Comamonas was enriched and dominant on anode electrodes when fed with acetate and aniline (Xing, Cheng et al 2010, Cheng, Liang et al 2015, Miyahara, Kouzuma et al 2015, Jiang, Xing et al 2016. When operated under denitrifying condition, apparent enrichment of Comamonas (>10 %) was observed in cathode chamber (Sotres, Cerrillo et al 2016 (Yu, Wu et al 2015). These two independent redox species are found as membrane-bound and extracellular soluble mediators which facilitates outward and inward electron transfer respectively.…”

Section: Environmental Factors Influencing Biofilm Lifestylementioning

confidence: 99%

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The biofilm lifestyle of comamonas in environmental applications : mechanistic studies and environmental implications

Wu¹

Self Cite

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Majors et al. 2012). Although Comamonas commonly exists as biofilms in diverse environments, most previous studies focused on exploring the catabolic activities of Comamonas in planktonic cultures. Therefore, understanding the biofilm lifestyle of Comamonas in different environmental processes and elucidating the influence of environmental conditions on the biofilm lifestyle are key to better understanding This thesis includes 7 chapters, which are highlighted as follows: Chapter 1. Introduction-This chapter provides the background information and research gaps and states the objective of this study. Chapter 2. Literature review-This chapter summarizes previous studies on biofilm biology of Comamonas and the ecological role of Comamonas in different environments. Chapter 3. Influence of 3-chloroaniline on the biofilm lifestyle of C. testosteroni and implications in bioaugmentation-The influence of 3-CA on biofilm lifestyle of C. testosteroni and its bioaugmentation in packed-bed biofilm reactors were elucidated.

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Impact of anodophilic biofilm bioelectroactivity on the denitrification behavior of air‐cathode microbial fuel cells

Zhao

Gao

Zhao

et al. 2021

Biotech & Bioengineering

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Generally, high bioelectroactivity of anodophilic biofilm favors high power generation of microbial fuel cell (MFC); however, it is not clear whether it can promote denitrification of MFC synchronously. In this study, we studied the impact of anodophilic biofilm bioelectroactivity on the denitrification behavior of air‐cathode MFC (AC‐MFC) in steady state and found that high bioelectroactivity of anodophilic biofilm not only favored high power generation of the AC‐MFC, but also promoted the growth of denitrifers at the anodes and strengthened denitrification. Anodophilic biofilms of AC‐MFC with various bioelectroactivity were acclimated at conditions of open circuit (OC), Rext of 1000 Ω and 20 Ω (denoted as AC‐MFC‐OC, AC‐MFC‐1000Ω, and AC‐MFC‐20Ω, respectively) and performed for over 100 days. Electrochemical tests and microbial analysis results showed that the anode of the AC‐MFC‐20Ω delivered higher current response of both oxidation and denitrification and had higher abundance of electroactive bacteria than the AC‐MFC‐OC, AC‐MFC‐1000Ω, demonstrating a higher bioelectroactivity of the anodophilic biofilms. Moreover, these electroactive bacteria favored the accumulation of denitrifers, like Thauera and Alicycliphilus, probably by consuming trace oxygen through catalyzing oxygen reduction. The AC‐MFC‐20Ω not only delivered a 61.7% higher power than the AC‐MFC‐1000Ω, but also achieved a stable and high denitrification rate constant (kDN) of 1.9 h−1, which was 50% and 40% higher than that of the AC‐MFC‐OC and AC‐MFC‐1000Ω, respectively. It could be concluded that the high bioelectroactivity of the anodophilic biofilms not only favored high power generation of the AC‐MFC, but also promoted the enrichment of denitrifers at the anodes and strengthened denitrification. This study provided an effective method for enhancing power generation and denitrification performance of the AC‐MFC synchronously.

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Adjustable bidirectional extracellular electron transfer between Comamonas testosteroni biofilms and electrode via distinct electron mediators

Cited by 52 publications

References 26 publications

Response of anodic bacterial community to the polarity inversion for chloramphenicol reduction

Response of anodic bacterial community to the polarity inversion for chloramphenicol reduction

The biofilm lifestyle of comamonas in environmental applications : mechanistic studies and environmental implications

Impact of anodophilic biofilm bioelectroactivity on the denitrification behavior of air‐cathode microbial fuel cells

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