Nitrous oxide (N2O) emissions from a pilot-scale oxidation ditch under different COD/N ratios, aeration rates and two shock-load conditions

Zheng, Maosheng; Zhou, Nan; He, Shishi; Chang, Fang; Zhong, Jie; Xu, Shuo; Wang, Zhe

doi:10.1016/j.jenvman.2020.111657

Cited by 25 publications

(8 citation statements)

References 48 publications

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“…According to Su et al ( 2017 ) and Zheng et al ( 2021 ), the parameters of operation of a wastewater treatment plant such as low DO concentration and the aeration strategy have a considerable effect on the N 2 O emission. An effective way to reduce N 2 O emission proved to be the introduction of IA.…”

Section: Resultsmentioning

confidence: 99%

Nitrification kinetics, N2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates

Zajac

Żubrowska-Sudoł

2022

Int. J. Environ. Sci. Technol.

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This study investigated the impact of intermittent aeration strategies and reduction in the reactor’s organic and nitrogen loading rates on the course of particular stages of the nitrification process, as well as energy consumption and N2O emissions in a hybrid reactor with nitrification/denitrification. Each of the analysed series revealed the greatest ammonia oxidation activity in activated sludge flocs. The highest activity of nitrite nitrogen oxidation was demonstrated in the case of biofilm. A reduction in the reactor’s organic and nitrogen loading rate value had a greater effect on changes in the activity of ammonia-oxidizing bacteria than nitrite-oxidizing bacteria. In a system where the operation of air pumps was controlled through switching them and off according to the adopted ratio between non-aerated and aerated sub-phase times and the assumed oxygen concentration, a reduction in the duration of aerated sub-phases caused no decrease in energy use for aeration. Lower N2O emission was recorded when the reactor operated with a longer duration of aerated sub-phases.

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Section: Resultsmentioning

confidence: 99%

Nitrification kinetics, N2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates

Zajac

Żubrowska-Sudoł

2022

Int. J. Environ. Sci. Technol.

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“…The N 2 O concentration increased gradually during aerated periods, followed by a sharp increase when aeration stopped due to ongoing production and lower stripping forces, but was rapidly consumed as influent was fed and oxygen consumed (Figure ). Overall, higher N 2 O emissions during the extended nitrification phases 3–8 and 5–10 suggest nitrification-driven N 2 O production due to higher NH 4 + loadings . During aerobic conditions, simultaneous COD and NH 4 + removal occurs, but the aeration capacity from the rotors could not supply enough oxygen to reach aerobic conditions at S0m when the nutrient load was high (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…Overall, higher N 2 O emissions during the extended nitrification phases 3−8 and 5− 10 suggest nitrification-driven N 2 O production due to higher NH 4 + loadings. 32 During aerobic conditions, simultaneous COD and NH 4 + removal occurs, but the aeration capacity from the rotors could not supply enough oxygen to reach aerobic conditions at S0m when the nutrient load was high (Figure 4). As the oxygen demand decreases during phases 3−8, DO increases (>1 mg/L), while NH 4 + remains nonlimiting, suggesting a higher specific AOB activity and lower C/N ratio, favoring N 2 O emissions.…”

Section: N 2 O Emissions In Phase-alternating Wwtpmentioning

confidence: 99%

Variability and Uncertainty Analysis of N₂O Emissions from WWTP to Improve the Accuracy of Emission Factors and the Design of Monitoring Strategies

Domingo-Félez,

Jensen,

Bang

et al. 2024

ACS EST Water

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Investigations on global nitrous oxide (N 2 O) emissions from wastewater treatment plants (WWTPs) often overlook data variability and uncertainty by utilizing averaged emission factors (EF and N 2 O emitted/total nitrogen load). The variability of the EF is system-specific: technology, operation, influent characteristics, and microbial community. The uncertainty of the EF is associated with the monitoring campaign: number of measuring locations, analytical methods, data frequency, and duration. This study quantified the spatial and temporal variability of N 2 O emissions and EF from liquid measurements of N 2 O in a surface-aerated WWTP over a 110-day campaign. The gas stripping model (k L a Nd 2 O ) yielded a minimum measurement error of 10.4% and 13.0% for the TN load . Daily patterns of N 2 O concentrations and emissions were not normally distributed but positively skewed, suggesting that log-distributions are more accurate descriptors (11.6% of the days emitted 50% of emissions). The EF was 0.30 ± 1.29% (n = 117602), and the higher standard deviation of the mean highlights the inaccuracy of normal distributions for N 2 O data sets, whereas the median and 2.5−97.5th quantiles and/or continuous logdistributions are more informative. An in silico analysis indicates that monitoring 5 out of 30 min instead of continuously provides reasonable accuracy and precision while allowing for six different monitoring locations.

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“…Noticeably, GHG production from direct discharge rural sewage was 7906.42 Gg in 2015 and 8744.72 Gg in 2020. The average COD concentration of rural sewage (Zheng et al 2021) and the protein consumption per capita (Fig. 8f) both increased from 2015 to 2020, leading to an increase in emissions per unit of quality sewage.…”

Section: Comparison Of the Ghg Produced By Treated And Untreated Sewagementioning

confidence: 99%

Spatial and Temporal Distribution of Greenhouse Gas Emissions from Rural Sewage Treatment in China

Han,

Zhang,

Wang

et al. 2023

Preprint

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Nitrous oxide (N2O) emissions from a pilot-scale oxidation ditch under different COD/N ratios, aeration rates and two shock-load conditions

Cited by 25 publications

References 48 publications

Nitrification kinetics, N2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates

Nitrification kinetics, N2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates

Variability and Uncertainty Analysis of N₂O Emissions from WWTP to Improve the Accuracy of Emission Factors and the Design of Monitoring Strategies

Spatial and Temporal Distribution of Greenhouse Gas Emissions from Rural Sewage Treatment in China

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Nitrous oxide (N2O) emissions from a pilot-scale oxidation ditch under different COD/N ratios, aeration rates and two shock-load conditions

Cited by 25 publications

References 48 publications

Nitrification kinetics, N2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates

Nitrification kinetics, N2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates

Variability and Uncertainty Analysis of N2O Emissions from WWTP to Improve the Accuracy of Emission Factors and the Design of Monitoring Strategies

Spatial and Temporal Distribution of Greenhouse Gas Emissions from Rural Sewage Treatment in China

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Variability and Uncertainty Analysis of N₂O Emissions from WWTP to Improve the Accuracy of Emission Factors and the Design of Monitoring Strategies