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

Ju, Kai; Wang, Lei; Lv, Yongtao; Zhang, Xueling; Miao, Rui; Wang, Xudong

doi:10.1016/j.jbiosc.2015.02.005

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…To the best of our knowledge, the N 2 O concentrations have never been monitored before in an intermediate buffer tank of a two-stage system; nonetheless, the predominant conditions could be compared to those during the settling phase of a nitritation reactor. During the settling phase, an accumulation of dissolved N 2 O was observed [29,31], but at a concentration several magnitudes lower as observed in this study. A significantly longer reaction phase for the metabolic N 2 O production pathway in the buffer tank with an HRT of approximately one day and an infinite SRT was assumed to be responsible for the higher accumulation of N 2 O.…”

Section: Measurements and Possible Production Pathwayssupporting

confidence: 60%

Performance and N2O Formation of the Deammonification Process by Suspended Sludge and Biofilm Systems—A Pilot-Scale Study

Leix

Hartl

Zeh³

et al. 2016

Water

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Abstract:A two-stage deammonification pilot plant with two different second-stage reactors, namely a sequencing batch reactor (SBR) with suspended sludge and a moving bed biofilm reactor (MBBR) with biofilm carriers, was investigated over a 1.5-year period to compare reactor performances. Additionally, dissolved nitrous oxide (N 2 O) was measured to determine the reactors' N 2 O formation potential. Although the nitritation performance was moderate (NO 2 -N/NH 4 -N effluent ratio of 0.32 ± 0.15 in combination with SBR and 0.25 ± 0.14 with MBBR), nitrogen turnover and degradation rates exceeding 500 g N/(m 3 ·day) and 80%, respectively, were achieved in both second stages, yet requiring additional aeration. The SBR's average nitrogen removal was 19% higher than the MBBR's; however, the SBR's nitrite influent concentration was comparably elevated. Concerning N 2 O formation, the nitritation reactor exhibited the lowest N 2 O concentrations, while the buffer tank, interconnecting the first and second stages, exhibited the highest N 2 O concentrations of all reactors. Given these high concentrations, a transfer of N 2 O into the second stage was observed, where anoxic phases enabled N 2 O reduction. Frequent biomass removal and a decreased hydraulic retention time in the buffer tank would likely minimize N 2 O formation. For the second stage, enabling anoxic periods in the intermittent aeration cycles right after feeding to support N 2 O reduction and thus minimize the stripping effects or the implementation of a complete anoxic ammonium oxidation will mitigate N 2 O emissions.

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Section: Measurements and Possible Production Pathwayssupporting

confidence: 60%

Performance and N2O Formation of the Deammonification Process by Suspended Sludge and Biofilm Systems—A Pilot-Scale Study

Leix

Hartl

Zeh³

et al. 2016

Water

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“…Kong et al (2013) studied a PN for treating high strength ammonium wastewater at 32 o C and found that the majority of the N O was detected as a peak at the beginning of the aeration phase and stabilized in a lower level during the rest of the aeration phase. Ju et al, (2015) also reported an initial N 2 O peak but in that case it seemed to be linked to the AOR that also decreased together with the N 2 O production rate. However, in our study, ammonia oxidation was constant during all the aeration period (Fig.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 92%

The effect of temperature shifts on N2O and NO emissions from a partial nitritation reactor treating reject wastewater

et al. 2018

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Temperature has a known effect on ammonia oxidizing bacteria (AOB) activities, reducing its ammonia oxidizing rate (AOR) when temperature is lowered. However, little is known concerning its effect on NO and NO emissions which are produced during ammonia oxidation having a greenhouse effect. To study this, an AOB enriched partial nitrification sequencing batch reactor (PN-SBR) was operated within a two step-wise feed under 5 different temperatures (30-25-20-15-10 °C). A decrease on the specific AOR (sAOR) was detected when decreasing the temperature. NO emissions were also affected by the temperature but only the ones produced during the first aeration of the cycle, when AOBs shifted from a period of low activity to a period of high activity. NO emission factors (%) detected during the second aerobic phase were similar among all temperatures tested and lower than the emissions detected during the first aerated phase. The average NO emission factor was in the range of 0.15-0.70% NO-N/NH-N oxidized in the first aeration phase and 0.14-0.15% NO-N/NH-N-oxidized in the second aeration phase at 10 to 30 °C, respectively. On the other hand, NO emissions were very similar under all temperatures resulting in 0.03-0.06% of NH-N oxidized.

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“…Macro-and microanalyses on N2O emission in autotrophic partial nitritation systems were performed by Ju et al (2015). An asymptotic function was used to estimate the quantity emitted, and it was concluded that partial nitritation occurred mainly in the floc surface layer during aeration.…”

Section: Ghg Emissions From Wwtpsmentioning

confidence: 99%

Gaseous Emissions from Wastewater Facilities

Koh¹,

Shaw²

2016

Water Environment Research

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A review of the literature published in 2015 on topics relating to gaseous emissions from wastewater facilities is presented. This review is divided into the following sections: odorant emissions from wastewater treatment plants (WWTPs); greenhouse gas (GHG) emissions from WWTPs; gaseous emissions from wastewater collection systems; physiochemical odor/emissions control methods; biological odor/emissions control methods; odor characterization/monitoring; and odor impacts/ risk assessments.

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

Cited by 11 publications

References 30 publications

Performance and N2O Formation of the Deammonification Process by Suspended Sludge and Biofilm Systems—A Pilot-Scale Study

Performance and N2O Formation of the Deammonification Process by Suspended Sludge and Biofilm Systems—A Pilot-Scale Study

The effect of temperature shifts on N2O and NO emissions from a partial nitritation reactor treating reject wastewater

Gaseous Emissions from Wastewater Facilities

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