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

Pan, Min; Wen, Xiao-Gang; Wu, Guangxue; Zhang, Mingchuan; Zhan, Xinmin

doi:10.1016/j.bej.2014.03.003

Cited by 26 publications

(11 citation statements)

References 29 publications

(48 reference statements)

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“…N 2 O emission was positively correlated with r NH4-N . Besides, low DO concentrations (less than 0.2 mg/L) facilitated N 2 O generation from AOB denitrification [24]. N 2 O from AOB denitrification pathway decreased as DO concentration increased from 0.35 to 3.5 mg/L [6].…”

Section: Nitrifying Activity and N 2 O Emissionmentioning

confidence: 97%

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: Nitrifying Activity and N 2 O Emissionmentioning

confidence: 97%

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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“…Corroborating with the found values, Bustillo-Lecompte et al (2014) report that wastewater from packing plants may have total nitrogen concentrations ranging from 50 to 841 mg L -1 and a pH range of 4.90 to 8.10. Pan et al (2014) found, on average, 172.6 mg L -1 of total nitrogen and 52 mg L -1 total phosphorus, when characterizing packing plant effluent. Palatsi et al (2011), in their work on the biodigestion of packing plant waste, characterized the effluent and found on average 150 mg L -1 of total Kjeldahl nitrogen.…”

Section: Characterization Of the Crude Effluentmentioning

confidence: 96%

Optimization of nitrogen and phosphorus removal from pig slaughterhouse and packing plant wastewater through electrocoagulation in a batch reactor

et al. 2018

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This work evaluated the removal of total Kjeldahl nitrogen (TKN) and total phosphorus (P) through electrocoagulation and used aluminum electrodes to optimize the potential differential (pd) and hydraulic retention time (HRT) variables in a batch reactor. The experimental design used was Rotatable Central Composite Design (RCCD). The application of the electrocoagulation in the treatment of effluents from pig slaughterhouses and packing plants proved to be efficient in relation to the removal of TKN and total phosphorus, obtaining maximum efficiency equal to 67.15% and 99%, respectively. The maximum TKN removal value was found in Test 12, where treatment conditions were 30 minutes for HRT and 20 volts for pd, which corresponds to 0.86 A of electric current and a current density of 17.2 mA cm-2. For P, the only test that removed below 99% was the first. Through statistical analyses, it was only possible to obtain a mathematical model for TKN removal. While the response surface graph did not present a defined range of the best conditions for the independent variables, it was possible to observe the tendency for better removal, a wide range of pd and values over 30 minutes for retention time.

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“…S3(a)), indicating that oxygen limitation suppressed the growth of AOB. Previously, N 2 O production has been associated with ammonia oxidation under aerobic conditions Pan et al 2014). However, in MLE systems, the ammonia oxidation rate may not correlate with N 2 O production, because N 2 O emissions during the high aeration period may be lowered by denitrification.…”

Section: Microbial Community Analysesmentioning

confidence: 99%

“…By influencing the redox conditions, it may also vary the levels of N 2 O production and consumption. Several studies have reported a negative correlation between the aeration rate and the amount of N 2 O emission in laboratory-scale SBRs Pan et al 2014), but the knowledge on the relationship in an MLE process is limited. On the other hand, the IRF ratio determines the fluxes of oxygen and nitrogen components, including the dissolved N 2 O transferred to the anoxic tank, which also governs N 2 O production and reduction therein.…”

Section: Introductionmentioning

confidence: 98%

“…Most previous studies have focused on the N 2 O released by nitrification or denitrification processes in continuous stirred tank reactors (Adouani et al 2010;Kampschreur et al 2009;Lu et al 2011) and in sequencing batch reactor (SBR) systems, where nitrification and denitrification are alternated under different redox conditions by turning the aeration on and off Pan et al 2014). However, little is known about N 2 O emissions from MLE processes, despite their relevance in mitigating N 2 O emission.…”

Section: Introductionmentioning

confidence: 99%

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Effects of aeration and internal recycle flow on nitrous oxide emissions from a modified Ludzak–Ettinger process fed with glycerol

Song

Suenaga

Harper

et al. 2015

Environ Sci Pollut Res

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Nitrous oxide (N2O) is emitted from a modified Ludzak-Ettinger (MLE) process, as a primary activated sludge system, which requires mitigation. The effects of aeration rates and internal recycle flow (IRF) ratios on N2O emission were investigated in an MLE process fed with glycerol. Reducing the aeration rate from 1.5 to 0.5 L/min increased gaseous the N2O concentration from the aerobic tank and the dissolved N2O concentration in the anoxic tank by 54.4 and 53.4 %, respectively. During the period of higher aeration, the N2O-N conversion ratio was 0.9 % and the potential N2O reducers were predominantly Rhodobacter, which accounted for 21.8 % of the total population. Increasing the IRF ratio from 3.6 to 7.2 decreased the N2O emission rate from the aerobic tank and the dissolved N2O concentration in the anoxic tank by 56 and 48 %, respectively. This study suggests effective N2O mitigation strategies for MLE systems.

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

Cited by 26 publications

References 29 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

Optimization of nitrogen and phosphorus removal from pig slaughterhouse and packing plant wastewater through electrocoagulation in a batch reactor

Effects of aeration and internal recycle flow on nitrous oxide emissions from a modified Ludzak–Ettinger process fed with glycerol

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