Linking nitrous oxide emissions to population dynamics of nitrifying and denitrifying prokaryotes in four full-scale wastewater treatment plants

Castellano‐Hinojosa, Antonio; Maza-Márquez, Paula; Melero-Rubio, Y; González‐López, Jesús; Rodelas, B.

doi:10.1016/j.chemosphere.2018.02.102

Cited by 32 publications

(23 citation statements)

References 46 publications

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“…According to their findings, intermittent aeration or over-aeration must be avoided in aerobic reactors. Castellano-Hinojosa et al (2018) linked the population of AOB, AOA and N 2 O-reducers with the changes in the operational and environmental variables in four4 conventional AS systems with pre-denitrification zones. They observed that N 2 O emissions mainly occurred due to incomplete denitrification, thus underlining the importance of ensuring the completion of the process for the emissions mitigation.…”

Section: Monitoring Campaigns and Mitigation Strategiesmentioning

confidence: 99%

“…quantitative reverse transcription polymerase chain reaction RT-qPCR, FISH, etc.) can quantify the microbiological structure driving the N-cycle and the bacterial population able to reduce N 2 O at WWTPs under various environmental and operational conditions(Castellano-Hinojosa et al, 2018;Song et al, 2014). Isotope techniques have only recently been implemented at full-scale systems to distinguish the respective contribution among the N 2 O pathways and increase the understanding of the pathways that are responsible for the N 2 O formation(Townsend-Small et al, 2011;.…”

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confidence: 99%

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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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Section: Monitoring Campaigns and Mitigation Strategiesmentioning

confidence: 99%

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confidence: 99%

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

et al. 2019

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“…Noda et al (2003) reported higher concentrations of dissolved and emitted N2O in anoxic and oxide reactors with lower SRT. Other authors have also associated lower SRT with NO2build-up and increased N2O production and emissions (Hanaki et al, 1992;Kampschreur et al, 2009;Castellano-Hinojosa et al, 2018). As previously reported, solid losses in SBR alongside decreased SRT are likely to favor increasing NO2build-up and N2O generation.…”

Section: Figure 3 (A) No2mentioning

confidence: 52%

Nitrite build-up effect on nitrous oxide emissions in a laboratory-scale anaerobic/aerobic/anoxic/aerobic sequencing batch reactor

2021

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Biological wastewater treatment processes with biological nitrogen removal are potential sources of nitrous oxide (N2O) emissions. It is important to expand knowledge on the controlling factors associated with N2O production, in order to propose emission mitigation strategies. This study therefore sought to identify the parameters that favor nitrite (NO2-) accumulation and its influence on N2O production and emission in an anaerobic/aerobic/anoxic/aerobic sequencing batch reactor with biological nitrogen removal. Even with controlled dissolved oxygen concentrations and oxidation reduction potential, the first aerobic phase promoted only partial nitrification, resulting in NO2- build-up (ranging from 29 to 57%) and consequent N2O generation. The NO2- was not fully consumed in the subsequent anoxic phase, leading to even greater N2O production through partial denitrification. A direct relationship was observed between NO2- accumulation in these phases and N2O production. In the first aerobic phase, the N2O/NO2- ratio varied between 0.5 to 8.5%, while in the anoxic one values ranged between 8.3 and 22.7%. Higher N2O production was therefore noted during the anoxic phase compared to the first aerobic phase. As a result, the highest N2O fluxes occurred in the second aerobic phase, ranging from 706 to 2416 mg N m-2 h-1, as soon as aeration was triggered. Complete nitrification and denitrification promotion in this system was proven to be the key factor to avoid NO2- build-up and, consequently, N2O emissions.

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“…However, few studies concerning N2O monitoring from full-scale WWTPs have attempted to link the findings of the N2O produced from WWTPs with the abundance of nitrifying and denitrifying populations (Castellano-Hinojosa et al, 2018) or with denitrifying genes expression (Song et al, 2014). A comprehensive assessment of the microbial ecology, gene expression and performance of various WWTP, designed for nutrient removal or not, is missing to understand the links between operational and design factors, microbial and functional factors, and N2O emissions.…”

Section: A C C E P T E D Mmentioning

confidence: 99%

The link between nitrous oxide emissions, microbial community profile and function from three full-scale WWTPs

Vieira

Galinha

Oehmen

et al. 2019

Science of The Total Environment

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Linking nitrous oxide emissions to population dynamics of nitrifying and denitrifying prokaryotes in four full-scale wastewater treatment plants

Cited by 32 publications

References 46 publications

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

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

Nitrite build-up effect on nitrous oxide emissions in a laboratory-scale anaerobic/aerobic/anoxic/aerobic sequencing batch reactor

The link between nitrous oxide emissions, microbial community profile and function from three full-scale WWTPs

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