Dataset Information

Nitrous Oxide Production in a Granule-based Partial Nitritation Reactor: A Model-based Evaluation.

ABSTRACT: Sustainable wastewater treatment has been attracting increasing attentions over the past decades. However, the production of nitrous oxide (N₂O), a potent GHG, from the energy-efficient granule-based autotrophic nitrogen removal is largely unknown. This study applied a previously established N₂O model, which incorporated two N₂O production pathways by ammonia-oxidizing bacteria (AOB) (AOB denitrification and the hydroxylamine (NH₂OH) oxidation). The two-pathway model was used to describe N₂O production from a granule-based partial nitritation (PN) reactor and provide insights into the N₂O distribution inside granules. The model was evaluated by comparing simulation results with N₂O monitoring profiles as well as isotopic measurement data from the PN reactor. The model demonstrated its good predictive ability against N₂O dynamics and provided useful information about the shift of N₂O production pathways inside granules for the first time. The simulation results indicated that the increase of oxygen concentration and granule size would significantly enhance N₂O production. The results further revealed a linear relationship between N₂O production and ammonia oxidation rate (AOR) (R²?=?0.99) under the conditions of varying oxygen levels and granule diameters, suggesting that bulk oxygen and granule size may exert an indirect effect on N₂O production by causing a change in AOR.

SUBMITTER: Peng L

PROVIDER: S-EPMC5377315 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature

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Publications

Nitrous Oxide Production in a Granule-based Partial Nitritation Reactor: A Model-based Evaluation.

Peng Lai L Sun Jing J Liu Yiwen Y Dai Xiaohu X Ni Bing-Jie BJ

Scientific reports 20170403

Sustainable wastewater treatment has been attracting increasing attentions over the past decades. However, the production of nitrous oxide (N2O), a potent GHG, from the energy-efficient granule-based autotrophic nitrogen removal is largely unknown. This study applied a previously established N2O model, which incorporated two N2O production pathways by ammonia-oxidizing bacteria (AOB) (AOB denitrification and the hydroxylamine (NH2OH) oxidation). The tw ...[more]

PMID: 28367960

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Project description:Oxygen deficient zones (ODZs) are major sites of net natural oceanic nitrous oxide (N2O) production and emissions. In order to understand changes in the magnitude of N2O production in response to global change, knowledge on the individual contributions of the major microbial pathways (nitrification and denitrification) to N2O production and their regulation is needed. In the ODZ of the coastal area off Peru, the sensitivity of N2O production to oxygen and organic matter was investigated using 15N-tracer experiments in combination with qPCR and microarray analysis of total and active functional genes targeting archaeal amoA and nirS as marker genes for nitrification and denitrification, respectively. Denitrification was responsible for the highest N2O production with mean 8.7 nmol L-1 d-1 but up to 118 Â± 27.8 nmol L-1 d-1 just below the oxic-anoxic interface. Highest N2O production from AO of 0.16 Â± 0.003 nmol L-1 d-1 occurred in the upper oxycline at O2 concentrations of 10 - 30 Âµmol L-1 which coincided with highest archaeal amoA transcripts/genes. Oxygen responses of N2O production varied with substrate, but production and yields were generally highest below 10 Âµmol L-1 O2. Particulate organic matter additions increased N2O production by denitrification up to 5-fold suggesting increased N2O production during times of high particulate organic matter export. High N2O yields from ammonium oxidation of 2.1% were measured, but the overall contribution to N2O production stays an order of magnitude behind denitrification as an N2O source. Hence, these findings show that denitrification is the most important N2O production process in low oxygen conditions fueled by organic carbon supply which implies a positive feedback of the total oceanic N2O sources in response to increasing oceanic deoxygenation. [SUBMITTER_CITATION]: Frey, C., Bange, H. W., Achterberg, E. P., Jayakumar, A., Löscher, C. R., Arévalo-Martínez, D. L., León-Palmero, E., Sun, M., Sun, X., Xie, R. C., Oleynik, S., and Ward, B. B.: Regulation of nitrous oxide production in low-oxygen waters off the coast of Peru, Biogeosciences, 17, 2263-2287

Dataset Information

Nitrous Oxide Production in a Granule-based Partial Nitritation Reactor: A Model-based Evaluation.

Publications

Nitrous Oxide Production in a Granule-based Partial Nitritation Reactor: A Model-based Evaluation.

Similar Datasets

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