N2O emission in a partial nitrification system: Dynamic emission characteristics and the ammonium-oxidizing bacteria community

Kong, Qiang; Liang, Shuang; Zhang, Jian; Xie, Huijun; Miao, Ming; Lin, Tian

doi:10.1016/j.biortech.2012.10.011

Cited by 42 publications

(18 citation statements)

References 29 publications

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“…The dissolved N 2 O profile peaked at 0.164 mg,L À1 in the first 20 min and then decreased to around 0.04 mg,L À1 toward the end of the aeration phase. A similar phenomenon was also observed by previous works (2,5,9). During the settling phase, the N 2 O level in off-gas and dissolved N 2 O decreased to 9.78 ppmv and 0.0315 mg,L À1 , respectively, as a consequence of the gaseliquid equilibrium.…”

Section: Nitrogen Transformation In a Typical Cyclesupporting

confidence: 81%

“…Desloover et al (8) investigated the N 2 O emission from combined partial-nitritation and anammox reactors and found that 97.5% of emitted N 2 O could be ascribed to the partial-nitritation reactor. Kong et al (9) estimated that about 0.8% of the incoming nitrogen load was transferred as N 2 O in the partial-nitritation cycle. For a sequencing batch reactor (SBR) system, it is generally accepted that N 2 O emission during the aeration phase makes a greater contribution.…”

mentioning

confidence: 99%

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Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses

Wang

et al. 2015

Journal of Bioscience and Bioengineering

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Section: Nitrogen Transformation In a Typical Cyclesupporting

confidence: 81%

mentioning

confidence: 99%

Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses

Wang

et al. 2015

Journal of Bioscience and Bioengineering

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“…Some ammonia-oxidizing bacteria (AOB) reduce NO 2 -to N 2 O or N 2 through a process called nitrifier denitrification (Tallect et al, 2006;Wrage et al, 2001;Colliver and Stephenson, 2000). Many studies have been conducted to estimate N 2 O emission rate of PN processes (Kong et al, 2013a;Kong et al, 2013b;Okabe et al, 2011;Law et al, 2011;Desloover et al, 2011;de Graff et al, 2010;Kampscheur et al, 2008). In contrast, there are few studies on N 2 O production pathways.…”

Section: Introductionmentioning

confidence: 99%

Source identification of nitrous oxide on autotrophic partial nitrification in a granular sludge reactor

et al. 2013

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Emission of nitrous oxide (N 2 O) during biological wastewater treatment is of growing concern since N 2 O is a major stratospheric ozone-depleting substance and an important greenhouse gas. The emission of N 2 O from a lab-scale granular sequencing batch reactor (SBR) for partial nitrification (PN) treating synthetic wastewater without organic carbon was therefore determined in this study, because PN process is known to produce more N 2 O than conventional nitrification processes. The average N 2 O emission rate from the SBR was 0.32 ± 0.17 mg-N L -1 h -1 , corresponding to the average emission of N 2 O of 0.8 ± 0.4% of the incoming nitrogen load (1.5 ± 0.8% of the converted NH 4 + ). Analysis of dynamic concentration profiles during one cycle of the SBR operation demonstrated that N 2 O concentration in off-gas was the highest just after starting aeration whereas N 2 O concentration in effluent was gradually increased in the initial 40 min of the aeration period and was decreased thereafter. Isotopomer analysis was conducted to identify the main N 2 O production pathway in the reactor during one cycle. The hydroxylamine (NH 2 OH) oxidation pathway accounted for 65% of the total N 2 O production in the initial phase during one cycle, whereas contribution of the NO 2 -reduction pathway to N 2 O production was comparable with that of the NH 2 OH oxidation pathway in the latter phase. In addition, 3 spatial distributions of bacteria and their activities in single microbial granules taken from the reactor were determined with microsensors and by in situ hybridization. Partial nitrification occurred mainly in the oxic surface layer of the granules and ammonia-oxidizing bacteria were abundant in this layer. N 2 O production was also found mainly in the oxic surface layer. Based on these results, although N 2 O was produced mainly via NH 2 OH oxidation pathway in the autotrophic partial nitrification reactor, N 2 O production mechanisms were complex and could involve multiple N 2 O production pathways.

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“…Generally, enhanced biological nitrogen removal processes, including simultaneous nitrification and denitrification (SND) and partial nitrification followed by denitrification, likely emit high amounts of N 2 O [17], which can be observed in Table 1. Comparing with low nitrogen wastewater treatment systems, high strength nitrogen wastewater is a trigger for high N 2 O emission.…”

Section: N 2 O Generation and Emission During A Typical Cycle In The mentioning

confidence: 98%

“…Generally, huge variation of N 2 O emission has been observed, 0-95% of nitrogen load from laboratory-scale WWTPs and 0-14.6% of nitrogen load from full-scale WWTPs [9]. Enhanced nutrient removal processes are considered to lead to N 2 O emission [17], especially biological nitrogen removal via nitrite processes. Intermittently aerated sequencing batch reactors have been found to preferably achieve partial nitrification and efficiently remove nitrogen through partial nitrification followed by denitrification (PND) [8].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of nitrous oxide (N2O) emission from intermittently aerated sequencing batch reactors (IASBRs) treating slaughterhouse wastewater at low temperature

Pan

Wen

et al. 2014

Biochemical Engineering Journal

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N2O emission in a partial nitrification system: Dynamic emission characteristics and the ammonium-oxidizing bacteria community

Cited by 42 publications

References 29 publications

Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses

Nitrous oxide emission in autotrophic partial nitritation system: Macro- and microanalyses

Source identification of nitrous oxide on autotrophic partial nitrification in a granular sludge reactor

Characteristics of nitrous oxide (N2O) emission from intermittently aerated sequencing batch reactors (IASBRs) treating slaughterhouse wastewater at low temperature

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