Nitrogen loss through anaerobic ammonium oxidation coupled with iron reduction in a mangrove wetland

Guan, Qingsong; Cao, Wenzhi; Wang, M.; Wu, Guanghua; Wang, F. F.; Jiang, Chao; Tao, Yinren; Gao, Ying

doi:10.1111/ejss.12552

Cited by 38 publications

(12 citation statements)

References 32 publications

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“…a penalised version of the likelihood function) as implemented in the R package gRapHD (Abreu et al, 2010). This inference procedure yields an optimal representation of the data in the sense that the probability of correct specification of the model, when using this penalisation, tends to 1 as the number of observations increases (see Haughton, 1988). The confidence intervals for the conditional correlations were obtained by a non-parametric bootstrap procedure (Davidson and Hinkley, 2005) with 10 000 bootstrap samples.…”

Section: Data Processing and Statistical Analysesmentioning

confidence: 99%

Regulation of N<sub>2</sub>O emissions from acid organic soil drained for agriculture

Taghizadeh‐Toosi¹,

Elsgaard²,

Clough³

et al. 2019

Biogeosciences

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Abstract. Organic soils drained for crop production or grazing land are agroecosystems with potentially high but variable emissions of nitrous oxide (N2O). The present study investigated the regulation of N2O emissions in a raised bog area drained for agriculture, which is classified as potentially acid sulfate soil. We hypothesised that pyrite (FeS2) oxidation was a potential driver of N2O emissions through microbially mediated reduction of nitrate (NO3-). Two sites with rotational grass, and two sites with a potato crop, were equipped for monitoring of N2O emissions and soil N2O concentrations at the 5, 10, 20, 50 and 100 cm depth during weekly field campaigns in spring and autumn 2015. Further data acquisition included temperature, precipitation, soil moisture, water table (WT) depth, and soil NO3- and ammonium (NH4+) concentrations. At all sites, the soil was acidic, with pH ranging from 4.7 to 5.4. Spring and autumn monitoring periods together represented between 152 and 174 d, with cumulative emissions of 4–5 kg N2O-N ha−1 at sites with rotational grass and 20–50 kg N2O-N ha−1 at sites with a potato crop. Equivalent soil gas-phase concentrations of N2O at grassland sites varied between 0 and 25 µL L−1 except for a sampling after slurry application at one of the sites in spring, with a maximum of 560 µL L−1 at the 1 m depth. At the two potato sites the levels of below-ground N2O concentrations ranged from 0.4 to 2270 µL L−1 and from 0.1 to 470 µL L−1, in accordance with the higher soil mineral N availability at arable sites. Statistical analyses using graphical models showed that soil N2O concentration in the capillary fringe (i.e. the soil volume above the water table influenced by tension saturation) was the strongest predictor of N2O emissions in spring and, for grassland sites, also in the autumn. For potato sites in autumn, there was evidence that NO3- availability in the topsoil and temperature were the main controls on N2O emissions. Chemical analyses of intact soil cores from the 0 to 1 m depth, collected at adjacent grassland and potato sites, showed that the total reduction capacity of the peat soil (assessed by cerium(IV) reduction) was much higher than that represented by FeS2, and the concentrations of total reactive iron (TRFe) were higher than those of FeS2. Based on the statistical graphical models and the tentative estimates of reduction capacities, FeS2 oxidation was unlikely to be important for N2O emissions. Instead, archaeal ammonia oxidation and either chemodenitrification or nitrifier denitrification were considered to be plausible pathways of N2O production in spring, whereas in the autumn heterotrophic denitrification may have been more important at arable sites.

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Section: Data Processing and Statistical Analysesmentioning

confidence: 99%

Regulation of N<sub>2</sub>O emissions from acid organic soil drained for agriculture

Taghizadeh‐Toosi¹,

Elsgaard²,

Clough³

et al. 2019

Biogeosciences

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“…The environmental conditions at sites where the Feammox process occurs and A6 is present have been described and show that the organism is common at sites where the pH is <7 and soils are iron rich . The Feammox process has been reported to occur by many investigators in many different environmental settings. − The Feammox stoichiometry when ferrihydrite is the Fe(III) source can be written as: …”

Section: Introductionmentioning

confidence: 99%

Defluorination of Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) by Acidimicrobium sp. Strain A6

Huang

Jaffé

2019

Environ. Sci. Technol.

296

209

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Incubations with pure and enrichment cultures of Acidimicrobium sp. strain A6 (A6), an autotroph that oxidizes ammonium to nitrite while reducing ferric iron, were conducted in the presence of PFOA or PFOS at 0.1 mg/L and 100 mg/L. Buildup of fluoride, shorter-chain perfluorinated products, and acetate was observed, as well as a decrease in Fe(III) reduced per ammonium oxidized. Incubations with hydrogen as a sole electron donor also resulted in the defluorination of these PFAS. Removal of up to 60% of PFOA and PFOS was observed during 100 day incubations, while total fluorine (organic plus fluoride) remained constant throughout the incubations. To determine if PFOA/PFOS or some of their degradation products were metabolized, and since no organic carbon source except these PFAS was added, dissolved organic carbon (DOC) was tracked. At concentrations of 100 mg/L, PFOA/PFOS were the main contributors to DOC, which remained constant during the pure A6 culture incubations. Whereas in the A6 enrichment culture, DOC decreased slightly with time, indicating that as defluorination of PFOS/PFOA occurred, some of the products were being metabolized by heterotrophs present in this culture. Results show that A6 can defluorinate PFOA/PFOS while reducing iron, using ammonium or hydrogen as the electron donor.

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“…The total inorganic carbon (TIC) content in soils directly affects Feammox A6 abundance because of its autotrophic growth. Thus, the large TOC supplements resulting from tidal fluctuations are favorable to the Feammox process 110 …”

Section: Influencing Factorsmentioning

confidence: 99%

A review on new ammonium oxidation alternatives for effective nitrogen removal from wastewater

Zhao

Feng

et al. 2022

J of Chemical Tech & Biotech

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As a highly oxidizing ion, ammonium (NH4+) is easily reduced by other reducing substances. Recently, NH4+ oxidation coupled with Fe3+, SO42−, and Mn4+ reduction (i.e., Feammox, Sulfammox, and Mnammox) has been confirmed and their collaborative roles in removing NH4+ have been revealed in several studies. However, only limited knowledge could be obtained on observed interactions with several variable parameters due to the exiguous research in this field, which makes it challenging to draw basic and mechanistic conclusions. This review focuses on these new NH4+ oxidation alternatives and provides a systematic and comprehensive overview of recent advances in these processes. Specifically, based on the summaries of their reaction conditions, nine influencing factors (including microorganisms, concentrations of reactants, pH, redox potential, temperature, organic carbon, oxygen concentration, salinity, and inhibitory substances) are discussed in detail. Then, the drawbacks of the three processes are pointed out. The results show that, at present, the practical engineering applications for NH4+ removal are not suitable due to their harsh reaction conditions and low removal efficiency. Finally, suggestions for further research on these processes are presented to inspire more interest from researchers in related fields and to promote and realize their large‐scale engineering application in the near future. © 2022 Society of Chemical Industry (SCI).

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Nitrogen loss through anaerobic ammonium oxidation coupled with iron reduction in a mangrove wetland

Cited by 38 publications

References 32 publications

Regulation of N<sub>2</sub>O emissions from acid organic soil drained for agriculture

Regulation of N<sub>2</sub>O emissions from acid organic soil drained for agriculture

Defluorination of Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) by Acidimicrobium sp. Strain A6

A review on new ammonium oxidation alternatives for effective nitrogen removal from wastewater

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Nitrogen loss through anaerobic ammonium oxidation coupled with iron reduction in a mangrove wetland

Cited by 38 publications

References 32 publications

Regulation of N&lt;sub&gt;2&lt;/sub&gt;O emissions from acid organic soil drained for agriculture

Regulation of N&lt;sub&gt;2&lt;/sub&gt;O emissions from acid organic soil drained for agriculture

Defluorination of Perfluorooctanoic Acid (PFOA) and Perfluorooctane Sulfonate (PFOS) by Acidimicrobium sp. Strain A6

A review on new ammonium oxidation alternatives for effective nitrogen removal from wastewater

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Regulation of N<sub>2</sub>O emissions from acid organic soil drained for agriculture

Regulation of N<sub>2</sub>O emissions from acid organic soil drained for agriculture