Mathematical modeling of nitrous oxide (N 2 O) production in anaerobic/anoxic/oxic processes: Improvements to published N 2 O models

Ding, Xiaoqian; Zhao, Jianqiang; Hu, Bo; Li, Xiaoling; Ge, Guanghuan; Gao, Kun; Chen, Ying

doi:10.1016/j.cej.2017.05.082

Cited by 15 publications

(7 citation statements)

References 31 publications

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“…The inhibition of high‐salt on N 2 O reductase and the competition of nitrogen reductases on electron donors lead to a lower rate of N 2 O reduction and a large accumulation of N 2 O. The oxygen half‐saturation constant of heterotrophic bacteria was calibrated to 2 g O 2 m −3 in six cases, which is larger than the 0.6 g O 2 m −3 calibrated by Ding et al . The oxygen half‐saturation constant of anammox bacteria was calibrated to 1 g O 2 m −3 in six cases, which is larger than the 0.01 g O 2 m −3 calibrated by Liu et al .…”

Section: Resultssupporting

confidence: 59%

“…The oxygen half‐saturation constant of anammox bacteria was calibrated to 1 g O 2 m −3 in six cases, which is larger than the 0.01 g O 2 m −3 calibrated by Liu et al . Heterotrophic bacteria and anaerobic AOB are enriched in the inner space of the biofilm, so it requires higher oxygen to inhibit the growth of heterotrophic bacteria and anaerobic ammonium oxidation, while AOB and NOB are mostly concentrated on the surface of the biofilm, so their oxygen half‐saturation constants are consistent with that calibrated by Ding et al . Aerobic maximal growth rate on X STO was calibrated to 2 day −1 , which is smaller than the 8.2 day −1 calibrated by Ding et al .…”

Section: Resultsmentioning

confidence: 95%

“…Heterotrophic bacteria and anaerobic AOB are enriched in the inner space of the biofilm, so it requires higher oxygen to inhibit the growth of heterotrophic bacteria and anaerobic ammonium oxidation, while AOB and NOB are mostly concentrated on the surface of the biofilm, so their oxygen half‐saturation constants are consistent with that calibrated by Ding et al . Aerobic maximal growth rate on X STO was calibrated to 2 day −1 , which is smaller than the 8.2 day −1 calibrated by Ding et al . This may also be due to the special structure of the biofilm limiting the growth of aerobic heterotrophic bacteria.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, a salinity inhibition term was added to the nitrite oxidation kinetic rate expression, as shown in Table . The model published by Ding et al . describes the electronic competition between the four reduction steps in the process of denitrification on intracellular polymers under starvation conditions.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore how to control the production of N 2 O in sewage biological treatment is an urgent problem to be solved. There are three main production pathways of N 2 O, namely ammonium‐oxidizing bacteria (AOB) denitrification, incomplete hydroxylamine (NH 2 OH) oxidation and heterotrophic denitrification …”

Section: Introductionmentioning

confidence: 99%

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Characteristics of nitrous oxide production under salt stress: a model study

Dai

Zhao

Nasry

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: A large amount of N 2 O is often generated in the high-salt wastewater nitrogen removal process, which is unfavorable to the environment, so it is necessary to build a model to describe the N 2 O production characteristics in high-salt environment.RESULTS: This work merges three nitrous oxide (N 2 O) production pathways, namely ammonium-oxidizing bacteria (AOB) denitrification, incomplete hydroxylamine (NH 2 OH) oxidation and heterotrophic denitrification, into a multispecies activated sludge model to describe N 2 O production under salt stress for the first time. The heterotrophic denitrification pathway was divided into two parts, namely denitrification on intracellular polymers and denitrification on endogenous respiration, and high-salt inhibition terms were added to the intracellular polymer expressions on the heterotrophic denitrification pathway. The developed model was calibrated by a cycle running experimental case and validated by three single experimental cases, then assessed by two different sets of experimental data. The results indicated that the model reproduced experimentally measured data from six cases perfectly. The modeling results showed that the heterotrophic denitrification pathway (70.04-81.52%) played a significant role in N 2 O production, while smaller amounts of N 2 O were generated by the AOB denitrification pathway (14.53-23.93%) and incomplete NH 2 OH oxidation pathway (3.54-7.75%).CONCLUSION: Denitrification on endogenous respiration will produce a small amount of N 2 O with an initial carbon source; when there is no initial carbon source, it will be dominant. Owing to the competitive effects of heterotrophic denitrifying bacterial nitrogen reductase on electron donors, N 2 O conversion (ratio of N 2 O production to total nitrogen removal) will increase with decreasing carbon source.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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