Characteristics of N2O release from fluidized media type BNR processes and identification of N2O sources

Kim, Tae-Hyeong; Lee, Myoung-Joo; Jang, Hyun-Sup; Min, Booki; Yoo, Gayoung; Hwang, Sun‐Jin

doi:10.5004/dwt.2011.2910

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The major N 2 O production pathways during BNR process include the hydroxylamine oxidation pathway of ammonia oxidizing bacteria (AOB), nitrifier denitrification pathway of AOB, heterotrophic denitrification pathway and chemical reactions 26 27 . The interplay of many parameters (such as DO and nitrite concentrations) determines the functional N 2 O production pathways as well as the overall emission factor 28 29 .…”

Section: Discussionmentioning

confidence: 99%

Unravelling the spatial variation of nitrous oxide emissions from a step-feed plug-flow full scale wastewater treatment plant

Pan

Akker

et al. 2016

Sci Rep

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Plug-flow activated sludge reactors (ASR) that are step-feed with wastewater are widely adopted in wastewater treatment plants (WWTPs) due to their ability to maximise the use of the organic carbon in wastewater for denitrification. Nitrous oxide (N2O) emissions are expected to vary along these reactors due to pronounced spatial variations in both biomass and substrate concentrations. However, to date, no detailed studies have characterised the impact of the step-feed configuration on emission variability. Here we report on the results from a comprehensive online N2O monitoring campaign, which used multiple gas collection hoods to simultaneously measure emission along the length of a full-scale, step-fed, plug-flow ASR in Australia. The measured N2O fluxes exhibited strong spatial-temporal variation along the reactor path. The step-feed configuration had a substantial influence on the N2O emissions, where the N2O emission factors in sections following the first and second step feed were 0.68% ± 0.09% and 3.5% ± 0.49% of the nitrogen load applied to each section. The relatively high biomass-specific nitrogen loading rate in the second section of the reactor was most likely cause of the high emissions from this section.

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Section: Discussionmentioning

confidence: 99%

Unravelling the spatial variation of nitrous oxide emissions from a step-feed plug-flow full scale wastewater treatment plant

Pan

Akker

et al. 2016

Sci Rep

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Effects of DO on N₂O emission during biological nitrogen removal using aerobic granular sludge via shortcut simultaneous nitrification and denitrification

Peng

Liang

Wang

et al. 2018

Environmental Technology

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Dissolved oxygen (DO) is an important factor influencing biological nitrogen removal. This study investigated the effects of different DO concentrations (4, 2, 1 mg/L) on nitrous oxide (NO) production and nitrogen removal via shortcut simultaneous nitrification and denitrification by aerobic granular sludge (SND) using a sequencing bath reactor. The results showed that NO production was highest (127.6 mg/m) at a DO concentration of 2 mg/L; this was 24.17 and 2.90 times the production at DO concentrations of 4 and 12 mg/L, respectively. The removal efficiency of total nitrogen also was the highest (61.68%) when the DO concentration was 2 mg/L, compared to 35.22% and 50.65% at DO concentrations of 4 and 1 mg/L, respectively. The efficiency of the SND process reached 53.86% at a DO concentration of 2 mg/L, which was 1.33 and 1.67 times the efficiencies at DO concentrations of 4 and 1 mg/L, respectively. Therefore, reducing the DO concentration benefited the SND process, but increased the emission of NO.

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Effects of temperature on N2O production in the process of nitrogen removal by micro-expansion aerobic granular sludge

Chen

Wen

Liang

et al. 2016

Desalination and Water Treatment

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Characteristics of N2O release from fluidized media type BNR processes and identification of N2O sources

Cited by 4 publications

References 17 publications

Unravelling the spatial variation of nitrous oxide emissions from a step-feed plug-flow full scale wastewater treatment plant

Unravelling the spatial variation of nitrous oxide emissions from a step-feed plug-flow full scale wastewater treatment plant

Effects of DO on N₂O emission during biological nitrogen removal using aerobic granular sludge via shortcut simultaneous nitrification and denitrification

Effects of temperature on N2O production in the process of nitrogen removal by micro-expansion aerobic granular sludge

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Characteristics of N2O release from fluidized media type BNR processes and identification of N2O sources

Cited by 4 publications

References 17 publications

Unravelling the spatial variation of nitrous oxide emissions from a step-feed plug-flow full scale wastewater treatment plant

Unravelling the spatial variation of nitrous oxide emissions from a step-feed plug-flow full scale wastewater treatment plant

Effects of DO on N2O emission during biological nitrogen removal using aerobic granular sludge via shortcut simultaneous nitrification and denitrification

Effects of temperature on N2O production in the process of nitrogen removal by micro-expansion aerobic granular sludge

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Effects of DO on N₂O emission during biological nitrogen removal using aerobic granular sludge via shortcut simultaneous nitrification and denitrification