Aerobic N 2 O emission for activated sludge acclimated under different aeration rates in the multiple anoxic and aerobic process

Wang, Huoqing; Guan, Yuntao; Pan, Min; Wu, Guangxue

doi:10.1016/j.jes.2015.08.010

Cited by 18 publications

(9 citation statements)

References 33 publications

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“…DO and pH were measured by a portable DO meter (Flexi, HACH, USA) and a pH meter (pH 30d, HACH, USA), respectively. N 2 O was tested by a gas chromatograph (GC-9720, Fuli, China) with an electron capture detector and a HP-PLOT/Q column (J&W GC Columns, Agilent Technologies, USA) according to Wang et al [7]. The N 2 O emission factor was calculated according to Kimochi et al [18].…”

Section: Methodsmentioning

confidence: 99%

“…The N 2 O emission factor was calculated according to Kimochi et al [18]. The efficiency of SND was calculated based on Wang et al [7].…”

Section: Methodsmentioning

confidence: 99%

“…Especially, N 2 O emission was stimulated under low DO, high NO 2 -N concentration and with the heterotrophic activity in the intermittent aeration process [7,8]. In the presence of heterotrophs, microbial competition among AOB, NOB and heterotrophs would be promoted, resulting in more N 2 O emission, which was highly dependent on the DO concentration [7]. Therefore, the selection of predominant microorganisms with the ability to reduce N 2 O was a key point to mitigate N 2 O emission.…”

Section: Introductionmentioning

confidence: 95%

“…AOB denitrification was prominent under high NO 2 -N concentrations [6]. Especially, N 2 O emission was stimulated under low DO, high NO 2 -N concentration and with the heterotrophic activity in the intermittent aeration process [7,8]. In the presence of heterotrophs, microbial competition among AOB, NOB and heterotrophs would be promoted, resulting in more N 2 O emission, which was highly dependent on the DO concentration [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nitrogen removal, nitrous oxide emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes

Sun

Xin

et al. 2018

Environmental Engineering Research

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Nitrogen removal, nitrous oxide (N2O) emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes were investigated. Two sequencing batch reactors (SBRs) and two continuous-flow multiple anoxic and aerobic reactors (CMRs) were operated under high dissolved oxygen (DO) (SBR-H and CMR-H) and low DO (SBR-L and CMR-L) concentrations, respectively. Nitrogen removal was enhanced under CMR and low DO conditions (CMR-L). The highest total inorganic nitrogen removal efficiency of 91.5% was achieved. Higher nitrifying and denitrifying activities in SBRs were observed. CMRs possessed higher N2O emission factors during nitrification in the presence of organics, with the highest N2O emission factor of 60.7% in CMR-L. SBR and low DO conditions promoted N2O emission during denitrification. CMR systems had higher microbial diversity. Candidatus Accumulibacter, Nitrosomonadaceae and putative denitrifiers (N2O reducers and producers) were responsible for N2O emission.

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Section: Methodsmentioning

confidence: 99%

“…The N 2 O emission factor was calculated according to Kimochi et al [18]. The efficiency of SND was calculated based on Wang et al [7].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nitrogen removal, nitrous oxide emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes

Sun

Xin

et al. 2018

Environmental Engineering Research

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“…Besides, ICEAS can be used to treat many different types of wastewaters such as industrial, municipal, and tannery wastewater ( Yoong et al, 2000 ; Maranón et al, 2008 ; Elmolla and Chaudhuri, 2011 ; Mojiri et al, 2014 ; Wang et al, 2015 ). Bao-Cang et al (2018) used synthetic wastewater and showed total organic carbon (TOC) and ammonium (NH 4 + ) removal efficiencies of 81.6 and 92.1%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

2020

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Swine wastewater contains high concentrations of organic compounds, nutrients (nitrogen and phosphorus), heavy metals, and residual antibiotics, amongst others, that have negative impacts on the water environment. The main aim of this work was to remove nutrients from anaerobically digested swine wastewater using an intermittent cycle extended aeration system (ICEAS). The effects of operational parameters such as cycle time, organic loading rate, C/N ratio, and aeration/mixing ratio on the pollutant removal efficiencies of ICEAS were studied and compared with the performance of a conventional sequencing batch reactor (SBR). The following optimal conditions were obtained: cycle time, 6 h; organic loading rate, 0.86 kg COD m −3 day −1 ; C/N ratio, 2.49-2.82; and aeration/ mixing ratio, 1.57. The pH was maintained in the range of 6.0-8.0. The total organic carbon (TOC), total nitrogen (TN), ammonium (NH 4 +), total phosphorus (TP), and color removal efficiencies of ICEAS were higher than those of the conventional SBR, with removal

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Enhanced biological nitrogen removal and N2O emission characteristics of the intermittent aeration activated sludge process

Sun

Guan

Pan

et al. 2017

Rev Environ Sci Biotechnol

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Aerobic N 2 O emission for activated sludge acclimated under different aeration rates in the multiple anoxic and aerobic process

Cited by 18 publications

References 33 publications

Nitrogen removal, nitrous oxide emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes

Nitrogen removal, nitrous oxide emission and microbial community in sequencing batch and continuous-flow intermittent aeration processes

Removal of Nutrients From Anaerobically Digested Swine Wastewater Using an Intermittent Cycle Extended Aeration System

Enhanced biological nitrogen removal and N2O emission characteristics of the intermittent aeration activated sludge process

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