2019
DOI: 10.1016/j.watres.2019.03.015
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The effect of pH on N2O production in intermittently-fed nitritation reactors

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Cited by 46 publications
(20 citation statements)
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“…In a separate study we quantified N 2 O emissions from a nitritation reactor from pH 6.5 to 8.5 and observed that the specific net N 2 O production rates and the fractional N 2 O yield increased 7-fold from pH 6.5 to 8, and decreased slightly with further pH increase to 8.5 (p < 0.05). 42 The results were consistent with previous studies: Law et al (2011) showed that the specific N 2 O production rate increased with pH to the maximum at pH 8 in the investigated pH range of 6.0−8.5, 43 while Rathnayake et al (2015) reported highest N 2 O emission at pH 7.5 in a PN reactor (pH 6.5−8.5). 44 Abiotic r N2O in the reactor was estimated from NH 2 OH oxidation by HNO 2 because its r N2O was 1−3 orders of magnitude higher compared to other abiotic reactions.…”
Section: Environmental Science and Technologysupporting
confidence: 92%
“…In a separate study we quantified N 2 O emissions from a nitritation reactor from pH 6.5 to 8.5 and observed that the specific net N 2 O production rates and the fractional N 2 O yield increased 7-fold from pH 6.5 to 8, and decreased slightly with further pH increase to 8.5 (p < 0.05). 42 The results were consistent with previous studies: Law et al (2011) showed that the specific N 2 O production rate increased with pH to the maximum at pH 8 in the investigated pH range of 6.0−8.5, 43 while Rathnayake et al (2015) reported highest N 2 O emission at pH 7.5 in a PN reactor (pH 6.5−8.5). 44 Abiotic r N2O in the reactor was estimated from NH 2 OH oxidation by HNO 2 because its r N2O was 1−3 orders of magnitude higher compared to other abiotic reactions.…”
Section: Environmental Science and Technologysupporting
confidence: 92%
“…Different operational and environmental conditions are applied for nitrification and denitrification processes in WWTPs, including dissolved oxygen (DO), pH, temperature, and so on. These parameters are found to have a close relationship with N 2 O emissions (Adouani et al, 2015;Li et al, 2015;Su et al, 2019b;Tumendelger et al, 2014). Also, the substrates or intermediates in the nitrogen removal process are reported to influence N 2 O production, such as the nitrogen loading (Frison et al, 2015;Seuntjens et al, 2018), NO 2 − , NH 2 OH, NO (Domingo-Félez & Smets, 2019) and organic carbon (Zhu & Chen, 2011).…”
Section: Introductionmentioning
confidence: 91%
“…NO is usually detected at very low concentrations in BNR reactors. Liquid NO concentrations of 0.11 ± 0.065 mg N/L were measured in lab-scale high nitritation reactors 93 , while off-gas NO concentrations of 50 ± 10 ppm and 50−90 ppm were measured in full-scale two-stage nitritation and anammox reactors, respectively 96 . In lab-scale denitrifying reactors, less than 0.3 ppm NO in the off-gas was detected 97 .…”
Section: Nomentioning
confidence: 99%
“…NH 2 OH is highly reactive and potentially toxic with a high turnover and is typically detected at low concentrations (e.g., 0.003–0.031 mg N/L in AOB pure cultures , and 0.03–0.11 mg N/L in lab-scale partial nitritation reactors ). As a nucleophilic reducing agent, NH 2 OH can undergo decomposition (2NH 2 OH → NH 3 + HNO + H 2 O) or oxidation by O 2 (2NH 2 OH + 1.5O 2 → 2NO + 3H 2 O) to form highly reactive oxidizing intermediates, such as HNO or NO that can chemically transform OMPs .…”
Section: Direct Versus Indirect Enzymatic Omp Transformation Mechanismsmentioning
confidence: 99%