2015
DOI: 10.1080/09593330.2014.1002862
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The synergistic effects of dissolved oxygen and pH on N2O production in biological domestic wastewater treatment under nitrifying conditions

Abstract: Nitrous oxide (N2O) is a potent greenhouse gas, which is produced during nitrifying and denitrifying processes. Some factors and mechanisms affecting N2O emission have been reported in previous literature, but wastewater biological nitrification is accompanied by a dynamic process of dissolved oxygen (DO) consumption and pH reduction, it is more meaningful to study the synergistic effects between DO and pH on N2O production. In this study, the synergistic effects between DO and pH on N2O production were invest… Show more

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Cited by 34 publications
(16 citation statements)
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“…Therefore, on the premise of the comparable specific maximum rates for oxygen reduction , (i.e., 0.54 mmol/mmol-COD/h) and NO 2 reduction , (i.e., 0.52 mmol/mmol-COD/h), increased AOR with higher DO would render more electrons for oxygen reduction to H 2 O and less for the AOB denitrification pathway for N 2 O production. This explanation agreed well with the assumption made by Li et al (2015). As Mred affinity constant for NO reduction , (i.e., 1.1×10 -4 mmol/mmol-COD) is four orders of magnitude lower than that for nitrite reduction , (i.e., 2.1 mmol/mmol-COD), the NH 2 OH pathway has a higher ability than the AOB denitrification pathway to compete for electrons for N 2 O production.…”
Section: Discussionsupporting
confidence: 89%
“…Therefore, on the premise of the comparable specific maximum rates for oxygen reduction , (i.e., 0.54 mmol/mmol-COD/h) and NO 2 reduction , (i.e., 0.52 mmol/mmol-COD/h), increased AOR with higher DO would render more electrons for oxygen reduction to H 2 O and less for the AOB denitrification pathway for N 2 O production. This explanation agreed well with the assumption made by Li et al (2015). As Mred affinity constant for NO reduction , (i.e., 1.1×10 -4 mmol/mmol-COD) is four orders of magnitude lower than that for nitrite reduction , (i.e., 2.1 mmol/mmol-COD), the NH 2 OH pathway has a higher ability than the AOB denitrification pathway to compete for electrons for N 2 O production.…”
Section: Discussionsupporting
confidence: 89%
“…We are unaware of any study measuring N 2 O isotopocules at natural abundance and ambient mole fractions with the N 2 OIA-30e-EP. The only studies published so far reporting N 2 O isotope data apply the N 2 OIA-30e-EP either at elevated [N 2 O] in a standardized gas matrix or using 15 N labeling, including Soto et al (2015), Li et al (2016), Kong et al (2017), Brase et al (2017), Wassenaar et al (2018) and Nikolenko et al (2019).…”
Section: Oa-icos (Abb -Los Gatos Research Inc)mentioning
confidence: 99%
“…the operational costs, especially for wastewater without sufficient alkalinity, incomplete nitrification and high N 2 O emissions can occur (5,6). However, if weakly acid-tolerant nitrifiers with high apparent oxygen affinity and low N 2 O yield are enriched in nitrifying bioreactors, efficient nitrification, low N 2 O emission, and low consumption of energy and chemicals could be achieved simultaneously.…”
mentioning
confidence: 99%