Simultaneous Fe(III) reduction and ammonia oxidation process in Anammox sludge

Li, Xiang; Huang, Yong; Liu, Hengwei; Wu, Chuan; Bi, Wei; Yang, Yuan; Liu, Xin

doi:10.1016/j.jes.2017.01.002

Cited by 76 publications

(15 citation statements)

References 26 publications

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Section: Caveats and Concluding Remarksmentioning

confidence: 99%

“…Moreover, it is worth pointing out the metabolism called feammox, a process where ferric instead of nitrite is taken as the electron acceptor for ammonia oxidation. Both feammox and anammox can anaerobically convert ammonia into dinitrogen [95], but the former process is supposed to be carried out by Acidimicrobiaceae from the Actinobacteria phylum [96, 97] and under anaerobic environments without the presence of anammox bacteria [98]. Likewise, a recent experimental study [99] proposed extant anammox bacteria as electroactive organisms and suggested the feasibility to utilize graphene oxides and man-made metallic electrodes mimicking metal oxides as the electron acceptor.…”

Section: Caveats and Concluding Remarksmentioning

confidence: 99%

See 1 more Smart Citation

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Liao

Wang

Luo

2021

Preprint

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The anaerobic ammonium oxidation (anammox) bacteria transform ammonium and nitrite to dinitrogen gas, and this obligate anaerobic process accounts for nearly half of global nitrogen loss. Yet its origin and evolution, which may give important insights into the biogeochemistry of early Earth, remains enigmatic. Here, we compile a comprehensive sequence data set of anammox bacteria, and confirm their single origin within the phylum Planctomycetes. After accommodating the uncertainties and factors influencing time estimates with different statistical methods, we estimate that anammox bacteria originated at around the so-called Great Oxidation Event (GOE; 2.32 to 2.5 billion years ago [Gya]) which is thought to have fundamentally changed global biogeochemical cycles. We further show that during the origin of anammox bacteria, genes involved in oxidative stress, bioenergetics and anammox granules formation were recruited, which may have contributed to their survival in an increasingly oxic Earth. Our findings suggest the rising level of atmospheric oxygen, which made nitrite increasingly available, as a potential driving force for the emergence of anammox bacteria. This is one of the first studies that link GOE to the evolution of obligate anaerobic bacteria.

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Section: Caveats and Concluding Remarksmentioning

confidence: 99%

Section: Caveats and Concluding Remarksmentioning

confidence: 99%

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Liao

Wang

Luo

2021

Preprint

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“…It provided a cue that the Anammox bacteria detected in our study, including Brocadiaceae, Kuenenia, and Jettenia, were capable of reducing iron(III) linked to oxidizing ammonium anaerobically at same time. Moreover, several publications demonstrated the potential role of Anammox bacteria in Feammox based on the increase in the N 2 production after amendment with iron(III) oxides in the Anammox sludge (Chen et al, 2014;Wang et al, 2016;Li X. et al, 2018;Yin et al, 2019). The Feammox bacteria Acidimicrobiaceae sp.…”

Section: Discussionmentioning

confidence: 99%

“…Thirdly, dilution of Anammox bacteria via three generations of subculture may be another important reason for the low activity of Feammox-associated N 2 production decreased during the incubation. Besides, Fe 3 O 4 can form from rapid iron(III) reduction with the production of Fe(II) absorbed on the ferric oxides surface and then improve N removal during Feammox process (Kappler et al, 2014;Li X. et al, 2018). Hence, it can be inferred that Fe(II) was accumulated with relatively low extent after subculturing in the treatment of Fe(III) + NH 4 + ; therefore, the amount of Fe 3 O 4 produced in the treatment was lower compared to the sludge reactor in continuous operation.…”

Section: Discussionmentioning

confidence: 99%

Anammox Bacteria Are Potentially Involved in Anaerobic Ammonium Oxidation Coupled to Iron(III) Reduction in the Wastewater Treatment System

Yang

et al. 2021

Front. Microbiol.

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Anaerobic ammonium oxidation coupled to nitrite reduction (termed as Anammox) was demonstrated as an efficient pathway to remove nitrogen from a wastewater treatment system. Recently, anaerobic ammonium oxidation was also identified to be linked to iron(III) reduction (termed Feammox) with dinitrogen, nitrite, or nitrate as end-product, reporting to enhance nitrogen removal from the wastewater treatment system. However, little is known about the role of Anammox bacteria in the Feammox process. Here, slurry from wastewater reactor amended with ferrihydrite was employed to investigate activity of Anammox bacteria in the Feammox process using the 15N isotopic tracing technique combined with 16S rRNA gene amplicon sequencing. A significantly positive relationship between rates of 15N2 production and iron(III) reduction indicated the occurrence of Feammox during incubation. Relative abundances of Anammox bacteria including Brocadia, Kuenenia, Jettenia, and unclassified Brocadiaceae were detected with low relative abundances, whereas Geobacteraceae dominated in the treatment throughout the incubation. 15N2 production rates significantly positively correlated with relative abundances of Geobacter, unclassified Geobacteraceae, and Anammox bacteria, revealing their contribution to nitrogen generation via Feammox. Overall, these findings suggested Anammox bacteria or cooperation between Anammox bacteria and iron(III) reducers serves a potential role in Feammox process.

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“… 2015 ) and anammox sludge (Li et al . 2018a , b ). During the Feammox process, the generation of dinitrogen gas is more favorable (−245 kJ/mol) than the generation of nitrite (−164 kJ/mol) or nitrate (−207 kJ/mol) (Luther et al .…”

Section: General Introductionmentioning

confidence: 99%

The hunt for the most-wanted chemolithoautotrophic spookmicrobes

Zandt

Slomp

et al. 2018

FEMS Microbiology Ecology

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Microorganisms are the drivers of biogeochemical methane and nitrogen cycles. Essential roles of chemolithoautotrophic microorganisms in these cycles were predicted long before their identification. Dedicated enrichment procedures, metagenomics surveys and single-cell technologies have enabled the identification of several new groups of most-wanted spookmicrobes, including novel methoxydotrophic methanogens that produce methane from methylated coal compounds and acetoclastic ‘Candidatus Methanothrix paradoxum’, which is active in oxic soils. The resultant energy-rich methane can be oxidized via a suite of electron acceptors. Recently, ‘Candidatus Methanoperedens nitroreducens’ ANME-2d archaea and ‘Candidatus Methylomirabilis oxyfera’ bacteria were enriched on nitrate and nitrite under anoxic conditions with methane as an electron donor. Although ‘Candidatus Methanoperedens nitroreducens’ and other ANME archaea can use iron citrate as an electron acceptor in batch experiments, the quest for anaerobic methane oxidizers that grow via iron reduction continues. In recent years, the nitrogen cycle has been expanded by the discovery of various ammonium-oxidizing prokaryotes, including ammonium-oxidizing archaea, versatile anaerobic ammonium-oxidizing (anammox) bacteria and complete ammonium-oxidizing (comammox) Nitrospira bacteria. Several biogeochemical studies have indicated that ammonium conversion occurs under iron-reducing conditions, but thus far no microorganism has been identified. Ultimately, iron-reducing and sulfate-dependent ammonium-oxidizing microorganisms await discovery.

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Simultaneous Fe(III) reduction and ammonia oxidation process in Anammox sludge

Cited by 76 publications

References 26 publications

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Phylogenomic evidence for the Origin of Obligately Anaerobic Anammox Bacteria around the Great Oxidation Event

Anammox Bacteria Are Potentially Involved in Anaerobic Ammonium Oxidation Coupled to Iron(III) Reduction in the Wastewater Treatment System

The hunt for the most-wanted chemolithoautotrophic spookmicrobes

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