Floc-based sequential partial nitritation and anammox at full scale with contrasting N2O emissions

Desloover, Joachim; Clippeleir, Haydée De; Boeckx, Pascal; Laing, Gijs Du; Colsen, Joop; Verstraete, Willy; Vlaeminck, Siegfried E.

doi:10.1016/j.watres.2011.02.028

Cited by 175 publications

(109 citation statements)

References 32 publications

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“…The ratio of N 2 O production rate to NLR in this study (0.8%) was in the same order (between 0.28% and 0.85%) of the other reactors. The ratios of a lab-scale column biofilm reactor (Okabe et al, 2011) and a full scale floc based sequential PN reactor (Desloover et al, 2011) were higher than the other reactors. The variation in N 2 O emission in previous studies (Figure 1) is attributed to a complicated pathway of biological and chemical N 2 O production, for example, NH 2 OH oxidation by AOB, NO reduction by heterotrophic bacteria and AOB, and chemodenitrification (Poughon et al, 2001;Lu and Chandran, 2010;Wrage et al, 2001;van Cleemput, 1998) and consumption (N 2 O reduction by heterotrophic bacteria and AOB (Pan et al, 2012;Schmidt et al, 2004)).…”

Section: Fluorescence In Situ Hybridization (Fish)mentioning

confidence: 80%

“…The PN-anammox process is applicable to reject water (Desloover et al, 2011;Kampschreur et al, 2008;2009a;Joss et al, 2009;Okabe et al, 2011), landfill leachate (Wang et al, 2010), and wastewater from semiconductor factory (Tokutomi et al, 2011). N 2 O emission from PN-anammox processes, especially from the PN process, has been reported (Desloover et al, 2011;Kampschreur et al, 2008;Okabe et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…N 2 O emission from PN-anammox processes, especially from the PN process, has been reported (Desloover et al, 2011;Kampschreur et al, 2008;Okabe et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Fluorescence In Situ Hybridization (Fish)mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

“…N 2 O emission from PN-anammox processes, especially from the PN process, has been reported (Desloover et al, 2011;Kampschreur et al, 2008;Okabe et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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“…Nitritation has been obtained in continuous mode [11,12,[30][31][32][33][34] or batch process [32,[35][36][37]. In general, continuous operation is usually the preferred choice when the reactor has to treat large flow-rates.…”

Section: Why Continuous Operation May Be the Preferred Choice?mentioning

confidence: 99%

Efficient and automated start-up of a pilot reactor for nitritation of reject water: From batch granulation to high rate continuous operation

Torà

Moliné

Carrera

et al. 2013

Chemical Engineering Journal

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Evaluation of two start‐up strategies to obtain nitrogen removal via nitrite and examination of the nitrous oxide emissions for different nitritation levels during the treatment of slaughterhouse wastewater

Dobbeleers

Caluwé

Daens

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND This study investigated the use of a novel start‐up strategy to obtain nitrogen removal via nitrite using real‐time aeration control, in a sequencing batch reactor (SBR1), for the treatment of slaughterhouse wastewater. In addition, another SBR (SBR2) was operated with the same objective, but with a start‐up from seed sludge. Furthermore, analysis of the nitrous oxide (N2O) production and emission was conducted for different nitritation levels. RESULTS Through the absence of an inoculum in SBR1, the nitrifying population could be regulated from the beginning. Beceause of this, nitrite oxidising bacteria could be prevented. This was proved by the nitritation degree (ND) which was already above 80% from day 28, although it took 59 days to achieve sufficient nitrogen removal efficiency (> 80%). In contrast for SBR2, it took 90–110 days to achieve full nitritation, however the nitrogen removal efficiency was above 90% at all times. The maximum N2O emission resulted to be 0.12% of the nitrogen load. CONCLUSION This study suggested the importance of seeding sludge for the achievement of full nitritation. Moreover, a strong positive relationship between the ND and N2O emission was observed. © 2017 Society of Chemical Industry

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Floc-based sequential partial nitritation and anammox at full scale with contrasting N2O emissions

Cited by 175 publications

References 32 publications

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

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

Efficient and automated start-up of a pilot reactor for nitritation of reject water: From batch granulation to high rate continuous operation

Evaluation of two start‐up strategies to obtain nitrogen removal via nitrite and examination of the nitrous oxide emissions for different nitritation levels during the treatment of slaughterhouse wastewater

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