Abiotic Nitrous Oxide (N2O) Production Is Strongly pH Dependent, but Contributes Little to Overall N2O Emissions in Biological Nitrogen Removal Systems

Su, Qingxian; Domingo-Félez, Carlos; Jensen, Marlene Mark; Smets, Barth F.

doi:10.1021/acs.est.8b06193

Cited by 67 publications

(40 citation statements)

References 47 publications

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“…A measure of the number of copies of each gene provides an index on the denitrification potential. Nitrogen can also be lost to N 2 O through nonbiological mechanisms whereby intermediates of the nitrification, hydroxylamine, and nitrite can be lost to N 2 O through chemical reactions (Su et al., 2019). This loss mechanism is dependent on the oxidation and reduction of Fe 2+ and Fe 3+ and is greatest at pH values <6 (Zhu‐Barker et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

CO₂ and N₂O emissions and microbial community structure from fields that include salt‐affected soils

et al. 2021

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Although salinity and sodicity are worldwide problems, information on greenhouse gas (GHG) emissions from agricultural salt-affected soils is scarce. The CO 2 -C and N 2 O-N emissions were quantified from three zones intertwined within a single U.S.northern Great Plains field: a highly productive zone (electrical conductivity with 1:1 soil/water mass ratio [EC 1:1 ] = 0.4 dS m -1 ; sodium adsorption ratio [SAR] = 1.8), a transition zone (moderately salt-affected; EC 1:1 = 1.6 dS m -1 ; SAR = 4.99), and a saline/sodic zone (EC 1:1 = 3.9 dS m -1 ; SAR = 22). In each zone, emissions were measured every 4 h for 7 d in four randomly placed chambers that were treated with two N rates (0 and 224 kg N ha -1 ). The experiment was conducted in 2018 and 2019 during similar seasonal periods. Soil samples taken from treatments after GHG measurement were analyzed for soil inorganic N, and microbial biomass from different communities was quantified using phospholipid fatty acid analysis. Realtime polymerase chain reaction was used to quantify the number of copies of some specific denitrification functional genes. The productive zone had the highest CO 2 -C, the lowest N 2 O-N emissions, and the greatest microbial biomass, whereas the saline/sodic zone had the lowest CO 2 -C, the highest N 2 O-N emissions, and the lowest microbial biomass. Within a zone, urea application did not influence CO 2 -C emissions; however, N 2 O-N emissions from the urea-treated saline/sodic zone were 84 and 57% higher than from the urea-treated productive zone in 2018 and 2019, respectively. The copy number of the nitrite reductase gene, nirS, was 42-fold higher in the saline/sodic zone than in the productive soil, suggesting that the saline/sodic soil had a high potential for denitrification. These findings suggest N 2 O-N emissions could be reduced by not applying N to saline/sodic zones.

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Section: Introductionmentioning

confidence: 99%

CO₂ and N₂O emissions and microbial community structure from fields that include salt‐affected soils

et al. 2021

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“…In previous studies, several pathways for N 2 O production have been suggested, including denitrification by heterotrophic bacteria and AOB [15,43], biological and chemical reactions derived from hydroxylamine [45], the abiotic reaction of hydroxylamine with free nitrous acid [46,47] and a hybrid reaction between hydroxylamine and NO 2 − [26,48,49]. Particularly, N 2 O production from AOB denitrification has been reported to be the main pathway when DO concentration is approximately 1.0 mg L −1 [15,43,50], which is this study's condition.…”

Section: Mechanism Of N 2 O Productionmentioning

confidence: 99%

Long-term Assessment of N2O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Otomo

Terada

et al. 2021

J. of Wat. & Envir. Tech.

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In full-scale sewage treatment plants, long-term and high-frequency monitoring is required to mitigate nitrous oxide (N 2 O) emissions. In this study, the profile of the dissolved N 2 O concentration in a full-scale oxidation ditch reactor was investigated to determine the variation of the N 2 O emission factor. It was found that the concentration of dissolved N 2 O depended on microbial activity, which is affected by water temperature, dissolved oxygen concentration, and the dimensional relationship between the rotator and the inflow point. In the reactor, higher transcription levels of amoA mRNA and lower transcription levels of clade II type nosZ mRNA may be associated with N 2 O production. The emission factor for removed dissolved inorganic nitrogen presented a mean value of 0.86% and a median of 0.19%. When N 2 O production was promoted, gasification from the water surface was the most significant emission source, accounting for 52% of the total N 2 O emitted, on average. The N 2 O emission factor was often lower than 0.01% during stable operation; however, this factor was subject to sudden increases caused by nitrite accumulation.

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“…Other abiotic reactions with N-compounds and metals were reviewed by Zhu-Barker (2015) [34]. However, the kinetic characterization of abiotic N 2 O production is still an urgent need to predict the relative contribution of each N 2 O pathway, with very few kinetic parameters reported [36,38,39].…”

Section: Genomic Potential Of Microbial Communities Driving N 2 O Promentioning

confidence: 99%

Regulation of key N2O production mechanisms during biological water treatment

Domingo-Félez

Smets

2019

Current Opinion in Biotechnology

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Abiotic Nitrous Oxide (N₂O) Production Is Strongly pH Dependent, but Contributes Little to Overall N₂O Emissions in Biological Nitrogen Removal Systems

Cited by 67 publications

References 47 publications

CO₂ and N₂O emissions and microbial community structure from fields that include salt‐affected soils

CO₂ and N₂O emissions and microbial community structure from fields that include salt‐affected soils

Long-term Assessment of N<sub>2</sub>O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Regulation of key N2O production mechanisms during biological water treatment

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Abiotic Nitrous Oxide (N2O) Production Is Strongly pH Dependent, but Contributes Little to Overall N2O Emissions in Biological Nitrogen Removal Systems

Cited by 67 publications

References 47 publications

CO2 and N2O emissions and microbial community structure from fields that include salt‐affected soils

CO2 and N2O emissions and microbial community structure from fields that include salt‐affected soils

Long-term Assessment of N<sub>2</sub>O Emission Factor in Full-scale Oxidation Ditch Reactor Considering Spatiotemporal Distribution

Regulation of key N2O production mechanisms during biological water treatment

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Abiotic Nitrous Oxide (N₂O) Production Is Strongly pH Dependent, but Contributes Little to Overall N₂O Emissions in Biological Nitrogen Removal Systems

CO₂ and N₂O emissions and microbial community structure from fields that include salt‐affected soils

CO₂ and N₂O emissions and microbial community structure from fields that include salt‐affected soils