Biofilm stratification during simultaneous nitrification and denitrification (SND) at a biocathode

Virdis, Bernardino; Read, Suzanne; Rabaey, Korneel; Rozendal, René A.; Yuan, Zhiguo; Keller, Jürg

doi:10.1016/j.biortech.2010.06.155

Cited by 154 publications

(58 citation statements)

References 38 publications

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“…In the bBC, Paracoccus was obviously enriched (30.94%), however which showed fewer relative abundance in the initial inoculum (0.01%) and gBC (0.01%). Previous study indicated that Paracoccus were more abundant on the denitrification biocathode biofilm portions in close proximity to the electrode suggested that it had advantage for the extracellular electrons transfer to the autotrophic denitrification reaction (Virdis et al, 2011). Variovorax (10.61%), Petrimonas (7.37%), Brachymonas (6.18%), Chryseobacterium (5.04%) and others (including nine genera less than 4% relative abundance respectively) were also enriched in the bBC.…”

Section: Potential Function Of Dominant Generamentioning

confidence: 95%

“…Firstly, most of the dominant genera (Escherichia, Pseudomonas, Mycobacterium, Flavobacterium, Raoultella, Enterobacter and Desulfovibrio) were capable of reducing nitroaromatics to corresponding aromatic amines or mineralization of nitroraomatics (Comamonas, Pseudomonas and Alcaligenes) (Claus et al, 2006;Ma et al, 2007;Marvin-Sikkema and de Bont, 1994;Spain, 1995) regardless of the performance mode. Subsequently, most of the dominant genera (Pseudomonas, Escherichia, Rhodopseudomonas, Ochrobactrum, Desulfovibrio, Enterobacter, Comamonas and Corynebacterium) were identified with electrochemically activity (Logan, 2009;Rosenbaum et al, 2011;Xing et al, 2010) or dominated in the biocathode (Enterococcus, Pseudomonas and Paracoccus) (Virdis et al, 2011;Wang et al, 2011) regardless of some of them dominated in the initial inoculum. Finally, some of dominant genera from autotroph were enriched in the bBC and some of dominant genera from heterotroph were abundant in the initial inoculum or gBC (both with glucose supply).…”

Section: Potential Function Of Dominant Generamentioning

confidence: 99%

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Microbial community structure and function of Nitrobenzene reduction biocathode in response to carbon source switchover

et al. 2014

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Section: Potential Function Of Dominant Generamentioning

confidence: 95%

Section: Potential Function Of Dominant Generamentioning

confidence: 99%

Microbial community structure and function of Nitrobenzene reduction biocathode in response to carbon source switchover

et al. 2014

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“…In microbial fuel cells, denitrification could happen in the anode (21) and cathode (28). In some research, a series of voltages were applied between the anode and cathode (18,20), and in the cathode, hydrogen was always produced.…”

Section: Nitrate and Nitrite Reduction Enhanced By Cathode In Besmentioning

confidence: 99%

Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Wang

Zeng

et al. 2015

Appl Environ Microbiol

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bThe utilization by Alcaligenes faecalis of electrodes as the electron donor for denitrification was investigated in this study. The denitrification rate of A. faecalis with a poised potential was greatly enhanced compared with that of the controls without poised potentials. For nitrate reduction, although A. faecalis could not reduce nitrate, at three poised potentials of ؉0.06, ؊0.06, and ؊0.15 V (versus normal hydrogen electrode [NHE]), the nitrate was partially reduced with ؊0.15-and ؊0.06-V potentials at rates of 17.3 and 28.5 mg/liter/day, respectively. The percentages of reduction for ؊0.15 and ؊0.06 V were 52.4 and 30.4%, respectively. Meanwhile, for nitrite reduction, the poised potentials greatly enhanced the nitrite reduction. The nitrite reduction rates for three poised potentials (؊0.06, ؊0.15, and ؊0.30 V) were 1.98, 4.37, and 3.91 mg/liter/h, respectively. When the potentials were cut off, the nitrite reduction rate was maintained for 1.5 h (from 2.3 to 2.25 mg/liter/h) and then greatly decreased, and the reduction rate (0.38 mg/liter/h) was about 1/6 compared with the rate (2.3 mg/liter/h) when potential was on. Then the potentials resumed, but the reduction rate did not resume and was only 2 times higher than the rate when the potential was off.A lcaligenes faecalis is a Gram-negative heterotrophic bacterium that is common in soil (1). A. faecalis was reported to aerobically produce nitrite (NO 2 Ϫ ), nitrate, nitric oxide (NO), and nitrous oxide in both peptone-meat extract and defined media with ammonium and citrate as the sole nitrogen and carbon sources (2). Nevertheless, A. faecalis also had denitrification ability as the bacterium had a copper-containing nitrite reductase that catalyzes the reduction of nitrite (NO 2 Ϫ ) to nitric oxide (NO) (3). Recent research by Lu et al. revealed that A. faecalis might be able to use extracellular electrons from semiconducting mineral photocatalysis for metabolism (4). In their study, with photoelectrons A. faecalis gradually became the dominant species in the soil microbial community, indicating this bacterium might have a potential to utilize photoelectrons (4).The interaction between microbes and solid minerals is becoming a worldwide hot spot in the field of geomicrobiology, an interdisciplinary field involving geology and microbiology. Especially, the electron flows between microbes and minerals (or electrodes) are a major research interest in this field. Currently, the models of microbes donating electrons to minerals (or electrodes) are categorized into three types: direct contact, electron shuttle, and microbial extracellular appendages (5). Direct contact between cells and the electrode surface will no doubt facilitate the electron exchanges (6). Under some circumstances, the environmental chemicals or microbially secreted chemicals could act as an electron shuttle, transferring electrons via redox reactions (7,8). Besides secreting chemical compounds, some bacteria have evolved extracellular structures, the conductive flagella called "nanowir...

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“…Nitrate is deemed to be removed at the cathode during the process of denitrification (Huang et al, 2013c;Puig et al, 2011). In comparison to the traditional biological treatment, this new approach reduces the carbon requirements per nitrogen denitrified by minimizing the competition between aerobic and anaerobic microorganisms for carbon oxidation (Virdis et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Performance and recent improvement in microbial fuel cells for simultaneous carbon and nitrogen removal: A review

Sun

Zhuang

et al. 2016

Journal of Environmental Sciences

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Biofilm stratification during simultaneous nitrification and denitrification (SND) at a biocathode

Cited by 154 publications

References 38 publications

Microbial community structure and function of Nitrobenzene reduction biocathode in response to carbon source switchover

Microbial community structure and function of Nitrobenzene reduction biocathode in response to carbon source switchover

Enhanced Alcaligenes faecalis Denitrification Rate with Electrodes as the Electron Donor

Performance and recent improvement in microbial fuel cells for simultaneous carbon and nitrogen removal: A review

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