Nitrogen loss from anaerobic ammonium oxidation coupled to Iron(III) reduction in a riparian zone

Ding, Bangjing; Li, Zhengkui; Qin, Yunbin

doi:10.1016/j.envpol.2017.08.027

Cited by 130 publications

(37 citation statements)

References 41 publications

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“…Pseudomonas, Carnobacterium, Anaeromyxobacter, Geobacter (Sawayama, 2006;Ding et al, 2017). The first and only pure feammox strain A6 belonging to Acidimicrobiaceae was reported by Huang and Jaffe in 2015.…”

Section: Exiguobacteriummentioning

confidence: 99%

Iron-reducing - and -proteobacteria isolated from laboratory-scaled heterotrophic feammox bioreactor

Chung¹,

Hai²,

Quyen³

et al. 2021

Vietnam J. Biotechnol.

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Ammonium removal from wastewater is a crucial step in wastewater treatment. Presently employed technologies based on nitrification/denitrification and partial nitritation/anammox principles require oxygen for the nitrification step, and are therefore still not yet fully satisfied with the application practice. In recent years, biological ammonium oxidation coupled with ferric iron reduction (feammox) has been proposed to be responsible for the nitrogen loss in different ecological habitats. Related to the wastewater aspect, the feammox principle has been discussed as an alternative approach for ammonium removal without dependency on oxygen. From a laboratory-scaled feammox bioreactor operated under neutral pH, two bacterial strains FN7 and FN9 were isolated by using the anaerobic Hungate technique. Comparative analyses of 16S rDNA sequences showed that these strains were most closely related to the b-proteobacterium Aciclyphilus denitrificans and the g-proteobacterium Pseudomonas stutzeri, respectively. Although being phylogenetically apart, strains FN7 and FN9 shared several common physiological characteristics that are considered meaningful for the feammox process, i.e. (i) heteroptrophic ammonium oxidation, (ii) denitrification, and (iii) ferric iron reduction. These isolates are proposed to play certain roles in the studied feammox system, contributing to the ammonium removal under heterotrophic feammox condition. The 16S rDNA sequences of strains FN7 and FN9 were available in GenBank under the accession numbers LC474369 and MT568614, respectively.

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Section: Exiguobacteriummentioning

confidence: 99%

Iron-reducing - and -proteobacteria isolated from laboratory-scaled heterotrophic feammox bioreactor

Chung¹,

Hai²,

Quyen³

et al. 2021

Vietnam J. Biotechnol.

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“…A previous study showed that only 2% of Fe(III) reduction was observed to be associated with Feammox reaction in a paddy soil when sufficient organic substrates were present [ 30 ]. Some studies reported that FeRB such as Geobacter can play an essential role in Feammox activities [ 27 , 37 ]. An indirect relationship was established between FeRB abundance and Feammox rate in these studies, as with increasing FeRB abundance Feammox reaction rate also increased.…”

Section: Introductionmentioning

confidence: 99%

Functional Interrelationships of Microorganisms in Iron-Based Anaerobic Wastewater Treatment

et al. 2021

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This study explicated the functional activities of microorganisms and their interrelationships under four previously reported iron reducing conditions to identify critical factors that governed the performance of these novel iron-dosed anaerobic biological wastewater treatment processes. Various iron-reducing bacteria (FeRB) and sulfate reducing bacteria (SRB) were identified as the predominant species that concurrently facilitated organics oxidation and the main contributors to removal of organics. The high organic contents of wastewater provided sufficient electron donors for active growth of both FeRB and SRB. In addition to the organic content, Fe (III) and sulfate concentrations (expressed by Fe/S ratio) were found to play a significant role in regulating the microbial abundance and functional activities. Various fermentative bacteria contributed to this FeRB-SRB synergy by fermenting larger organic compounds to smaller compounds, which were subsequently used by FeRB and SRB. Feammox (ferric reduction coupled to ammonium oxidation) bacterium was identified in the bioreactor fed with wastewater containing ammonium. Organic substrate level was a critical factor that regulated the competitive relationship between heterotrophic FeRB and Feammox bacteria. There were evidences that suggested a synergistic relationship between FeRB and nitrogen-fixing bacteria (NFB), where ferric iron and organics concentrations both promoted microbial activities of FeRB and NFB. A concept model was developed to illustrate the identified functional interrelationships and their governing factors for further development of the iron-based wastewater treatment systems.

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“…Feammox [anaerobic ammonium oxidation coupled to iron(III) reduction] is a pathway of nitrogen cycling identified recently and makes a contribution to nitrogen loss in various environments, such as terrestrial (e.g., wetland, tropical rainforest, and paddy soils) and aquatic ecosystem (e.g., freshwater and marine) in addition to denitrification, co-denitrification, and anaerobic ammonium oxidation (Clement et al, 2005;Yang et al, 2012;Ding et al, 2014Ding et al, , 2017Ding et al, , 2019Huang and Jaffé, 2014;Zhou et al, 2016). Previous studies showed that iron(III)-reducing bacteria such as Anaeromyxobacter, Pseudomonas, Geobacter, Desulfosporosinus, Dechloromonas, and Geothrix always dominated in the Feammox "pool" (Zhou et al, 2016;Li et al, 2019); however, these iron(III) reducers prefer to utilize organic carbon for iron(III) reduction.…”

Section: Introductionmentioning

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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Nitrogen loss from anaerobic ammonium oxidation coupled to Iron(III) reduction in a riparian zone

Cited by 130 publications

References 41 publications

Iron-reducing - and -proteobacteria isolated from laboratory-scaled heterotrophic feammox bioreactor

Iron-reducing - and -proteobacteria isolated from laboratory-scaled heterotrophic feammox bioreactor

Functional Interrelationships of Microorganisms in Iron-Based Anaerobic Wastewater Treatment

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

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