Partial nitrification in an air-lift reactor with long-term feeding of increasing ammonium concentrations

Chai, Liyuan; Ali, Mohammad; Min, Xin; Song, Yunfeng; Tang, Chong–Jian; Wang, Haiying; Cheng, Yu; Yang, Zhihui

doi:10.1016/j.biortech.2015.02.091

Cited by 41 publications

(10 citation statements)

References 31 publications

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“…Results indicate that NAR was quickly lost once the inhibitory conditions for NOB were suppressed in Stage III. This would demonstrate that the inhibitory effects of FNA on NOB were temporary [ 15 , 27 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

Belmonte

Hsieh

Campos

et al. 2017

BioMed Research International

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The effect of free ammonia (NH3 or FA), free nitrous acid (HNO2 or FNA), and total alkalinity (TA) on the performance of a partial nitrification (PN) sequencing batch reactor (SBR) treating anaerobically pretreated pig slurry was studied. The SBR was operated under alternating oxic/anoxic (O/A) conditions and was fed during anoxic phases. This strategy allowed using organic matter to partially remove nitrite (NO2−) and nitrate (NO3−) generated during oxic phases. The desired NH4+ to NO2− ratio of 1.3 g N/g N was obtained when an Ammonium Loading Rate (ALR) of 0.09 g NH4+-N/L·d was applied. The system was operated at a solid retention time (SRT) of 15–20 d and dissolved oxygen (DO) levels higher than 3 mg O2/L during the whole operational period. PN mainly occurred caused by the inhibitory effect of FNA on nitrite oxidizing bacteria (NOB). Once HNO2 concentration was negligible, NH4+ was fully oxidized to NO3− in spite of the presence of FA. The use of biomass acclimated to ammonium as inoculum avoided a possible effect of FA on NOB activity.

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Section: Resultsmentioning

confidence: 99%

Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

Belmonte

Hsieh

Campos

et al. 2017

BioMed Research International

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show abstract

“…FA and FNA are known to inhibit nitrification, especially nitrite oxidation 3 21 . Although many researchers have reported concentrations of FA and FNA that might inhibit the growth of NOB and cause the accumulation of AOB, the critical values recorded in these studies have varied 3 22 23 . NOB is inhibited by FA at concentrations ranging from 1 to 7 mg/L, while AOB begins to be inhibited at 150 mg/L 9 .…”

Section: Resultsmentioning

confidence: 99%

Performance and microbial ecology of a nitritation sequencing batch reactor treating high-strength ammonia wastewater

Chen

Dai

Cao

et al. 2016

Sci Rep

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The partial nitrification (PN) performance and the microbial community variations were evaluated in a sequencing batch reactor (SBR) for 172 days, with the stepwise elevation of ammonium concentration. Free ammonia (FA) and low dissolved oxygen inhibition of nitrite-oxidized bacteria (NOB) were used to achieve nitritation in the SBR. During the 172 days operation, the nitrogen loading rate of the SBR was finally raised to 3.6 kg N/m3/d corresponding the influent ammonium of 1500 mg/L, with the ammonium removal efficiency and nitrite accumulation rate were 94.12% and 83.54%, respectively, indicating that the syntrophic inhibition of FA and low dissolved oxygen contributed substantially to the stable nitrite accumulation. The results of the 16S rRNA high-throughput sequencing revealed that Nitrospira, the only nitrite-oxidizing bacteria in the system, were successively inhibited and eliminated, and the SBR reactor was dominated finally by Nitrosomonas, the ammonium-oxidizing bacteria, which had a relative abundance of 83%, indicating that the Nitrosomonas played the primary roles on the establishment and maintaining of nitritation. Followed by Nitrosomonas, Anaerolineae (7.02%) and Saprospira (1.86%) were the other mainly genera in the biomass.

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“…500-1000 mg N/L) [10,20,22]. The partial nitrification achieved during massive solid loss in this study indicated that the specific biomass NH4 + load rate could be increased to achieve partial nitrification for low NH4 + concentration condition (less than ca.…”

Section: Mechanisms Of No2 -Accumulationmentioning

confidence: 86%

Differentiating two partial nitrification mechanisms: Inhibiting nitrite oxidizing bacteria activity or promoting ammonium oxidizing bacteria activity

Zhang

Yan

2016

Journal of Environmental Chemical Engineering

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Partial nitrification in an air-lift reactor with long-term feeding of increasing ammonium concentrations

Cited by 41 publications

References 31 publications

Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

Effect of Free Ammonia, Free Nitrous Acid, and Alkalinity on the Partial Nitrification of Pretreated Pig Slurry, Using an Alternating Oxic/Anoxic SBR

Performance and microbial ecology of a nitritation sequencing batch reactor treating high-strength ammonia wastewater

Differentiating two partial nitrification mechanisms: Inhibiting nitrite oxidizing bacteria activity or promoting ammonium oxidizing bacteria activity

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