N2O emissions from full-scale nitrifying biofilters

Bollon, Julien; Filali, Ahlem; Fayolle, Yannick; Guérin, Sabrina; Rocher, Vincent; Gillot, S.

doi:10.1016/j.watres.2016.05.091

Cited by 47 publications

(18 citation statements)

References 33 publications

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“…Nevertheless, these studies were not specifically focused on temperature and other side parameters affected the emissions. On the one hand, Bollon et al (2016) found that PFtot (based on the N-oxidized) from full-scale nitrifying biofilters performing complete nitrification were higher in the winter campaign (PFtot = 4.9 ± 0.5% at 15 °C) than in the summer campaign (PFtot = 2.3 ± 0.5% at 22.5 °C), which contrasts with the results of the present study. However, they suggested that the negative influence of temperature on emissions was not related to the temperature itself, but to the low DO and high nitrite concentrations occurred in winter, which enhance N2O production.…”

Section: In Supportingcontrasting

confidence: 99%

“…There was a huge variability on N2O emissions values reported in literature, ranging from 1.5% (Rathnayake et al, 2013) to 11% (Desloover et al, 2011) of the ammonium oxidized emitted as N2O. This variability was due to differences in reactor configurations, type of influent, conditions applied and even the methodology used for quantifying emissions (Bollon et al, 2016). In the case of PN/A systems at mainstream conditions, to the best of the authors' knowledge, only Wang et al (2016b) and Reino et al (2016) reported N2O gas emissions of a nitritation reactor treating a low-strength synthetic influent.…”

Section: Introductionmentioning

confidence: 99%

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Effect of temperature on N2O emissions from a highly enriched nitrifying granular sludge performing partial nitritation of a low-strength wastewater

et al. 2017

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In the race to achieve a sustainable urban wastewater treatment plant, not only the energy requirements have to be considered but also the environmental impact of the facility. Thus, nitrous oxide (NO) emissions are a key-factor to pay attention to, since they can dominate the total greenhouse gases emissions from biological wastewater treatment. In this study, NO production factors were calculated during the operation of a granular sludge airlift reactor performing partial nitritation treating a low-strength synthetic influent, and furthermore, the effect of temperature on NO production was assessed. Average gas emission relative to conversion of ammonium was 1.5 ± 0.3% and 3.7 ± 0.5% while the effluent contained 0.5 ± 0.1% and 0.7 ± 0.1% (% N-oxidized) at 10 and 20 °C, respectively. Hence, temperature increase resulted in higher NO production. The reasons why high temperature favoured NO production remained unclear, but different theoretical hypotheses were suggested.

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Section: In Supportingcontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of temperature on N2O emissions from a highly enriched nitrifying granular sludge performing partial nitritation of a low-strength wastewater

et al. 2017

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“…Seasonality is also supported by the findings of several other studies (Brotto et al, 2015;Sun et al, 2013;Yan et al, 2014). Bollon et al (2016a)Bollon et al, (2016b and Bollon et al…”

Section: Duration Of Monitoring Campaigns and Seasonalitysupporting

confidence: 67%

A decade of nitrous oxide (N2O) monitoring in full-scale wastewater treatment processes: A critical review

et al. 2019

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Direct nitrous oxide (N 2 O) emissions during the biological nitrogen removal (BNR) processes can significantly increase the carbon footprint of wastewater treatment plant (WWTP) operations. Recent onsite measurement of N 2 O emissions at WWTPs have been used as an alternative to the controversial theoretical methods for the N 2 O calculation. The full-scale N 2 O monitoring campaigns help to expand our knowledge on the N 2 O production pathways and the triggering operational conditions of processes. The accurate N 2 O monitoring could help to find better process control solutions to mitigate N 2 O emissions of wastewater treatment systems. However, quantifying the emissions and understanding the long-term behaviour of N 2 O fluxes in WWTPs remains challenging and costly. A review of the recent full-scale N 2 O monitoring campaigns is conducted. The analysis covers the quantification and mitigation of emissions for different process groups, focusing on techniques that have been applied for the identification of dominant N 2 O pathways and triggering operational conditions, techniques using operational data and N 2 O data to identify mitigation measures and mechanistic modelling. The analysis of various studies showed that there are still difficulties in the comparison of N 2 O emissions and the development of emission factor (EF) databases; the N 2 O fluxes reported in literature vary significantly even among groups of similar processes. The results indicated that the duration of the monitoring campaigns can impact the EF range. Most N 2 O monitoring campaigns lasting less than one month, have reported N 2 O EFs less than 0.3% of the N-load, whereas studies lasting over a year have a median EF equal to 1.7% of the N-load. The findings of the current study indicate that complex feature extraction and multivariate data mining methods can efficiently convert wastewater operational and N 2 O data into information, determine complex relationships within the available datasets and boost the long-term understanding of the N 2 O fluxes behaviour. The acquisition of reliable full-scale N 2 O monitoring data is significant for the calibration and validation of the mechanistic models of-describing the N 2 O emission generation in WWTPs. They can be combined with the multivariate tools to further enhance the interpretation of the complicated full-scale N 2 O emission patterns. Finally, a gap between the identification of effective N 2 O mitigation strategies and their actual implementation within the monitoring and control of WWTPs has been identified. This study concludes that there is a further need for i) long-term N 2 O monitoring studies, ii) development of data-driven methodological approaches for the analysis of WWTP operational and N 2 O data, and iii) better understanding of the trade-offs among N 2 O emissions, energy consumption and system performance to support the optimization of the WWTPs operation.

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“…Heterotrophic denitrification and nitrifier denitrification produce N 2 O from nitrite reduction conducted by denitrifiers and ammonium oxidizers, respectively. Temperature, and electron donor and acceptor concentrations have been identified to control N 2 O emissions from WRRFs (Bollon et al, 2016;Kampschreur et al, 2009;Tumendelger et al, 2014Tumendelger et al, , 2016Wunderlin et al, 2012). These variables may induce N 2 O accumulation due to inhibition or disturbance of enzyme activity (Betlach and Tiedje, 1981;Kim et al, 2008;Otte et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Isotopic evidence for alteration of nitrous oxide emissions and producing pathways' contribution under nitrifying conditions

et al. 2020

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Abstract. Nitrous oxide (N2O) emissions from a nitrifying biofilm reactor were investigated with N2O isotopocules. The nitrogen isotopomer site preference of N2O (15N-SP) indicated the contribution of producing and consuming pathways in response to changes in oxygenation level (from 0 % to 21 % O2 in the gas mix), temperature (from 13.5 to 22.3 ∘C) and ammonium concentrations (from 6.2 to 62.1 mg N L−1). Nitrite reduction, either nitrifier denitrification or heterotrophic denitrification, was the main N2O-producing pathway under the tested conditions. Difference between oxidative and reductive rates of nitrite consumption was discussed in relation to NO2- concentrations and N2O emissions. Hence, nitrite oxidation rates seem to decrease as compared to ammonium oxidation rates at temperatures above 20 ∘C and under oxygen-depleted atmosphere, increasing N2O production by the nitrite reduction pathway. Below 20 ∘C, a difference in temperature sensitivity between hydroxylamine and ammonium oxidation rates is most likely responsible for an increase in N2O production via the hydroxylamine oxidation pathway (nitrification). A negative correlation between the reaction kinetics and the apparent isotope fractionation was additionally shown from the variations of δ15N and δ18O values of N2O produced from ammonium. The approach and results obtained here, for a nitrifying biofilm reactor under variable environmental conditions, should allow for application and extrapolation of N2O emissions from other systems such as lakes, soils and sediments.

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N2O emissions from full-scale nitrifying biofilters

Cited by 47 publications

References 33 publications

Effect of temperature on N2O emissions from a highly enriched nitrifying granular sludge performing partial nitritation of a low-strength wastewater

Effect of temperature on N2O emissions from a highly enriched nitrifying granular sludge performing partial nitritation of a low-strength wastewater

A decade of nitrous oxide (N2O) monitoring in full-scale wastewater treatment processes: A critical review

Isotopic evidence for alteration of nitrous oxide emissions and producing pathways' contribution under nitrifying conditions

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