Advanced strategies to improve nitrification process in sequencing batch reactors - A review

Jaramillo, Francisco; Orchard, Marcos E.; Muñoz, Carlos; Zamorano, Mauricio; Antileo, Christian

doi:10.1016/j.jenvman.2018.04.019

Cited by 68 publications

(30 citation statements)

References 101 publications

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“…(b)], for all of the NLR values studied and for both systems, there was no accumulation of nitrite. This behaviour can be attributed to the pH values in the reactor (around 8) and the high value of dissolved oxygen . At NLR = 0.176 kgN m −3 d –1 the nitrate accumulation decreased in both systems; however, there was a higher accumulation of nitrate in the system with zeolite in comparison to the system without zeolite.…”

Section: Resultsmentioning

confidence: 93%

Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier

Huiliñir

Fuentes

Esposito

et al. 2019

J of Chemical Tech & Biotech

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It has recently come to our attention that the Acknowledgements section has been missed to include in the article 'Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier' REFERENCE 1 Huiliñir C, Fuentes V, Esposito G, Montalvo S and Guerrero L, Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier.

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Section: Resultsmentioning

confidence: 93%

Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier

Huiliñir

Fuentes

Esposito

et al. 2019

J of Chemical Tech & Biotech

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“…However, the SS-AE nir S denitrifiers were probably mainly distributed in the biofilm interlayers under aerobic conditions in the AE-D reactors, while the SS-AN nir S denitrifiers probably occurred in both the inter- and outer-layers of the biofilms in the AN-D reactors [ 27 , 39 ]. The nir S activity decrease after the Ae interruptions in the AE-D reactors probably resulted from the NO 3 − -N limitation due to the NO 3 − -N reduction by nitrification ( Figure 5 B,D) [ 27 ], while the nir S activity decrease after the As interruptions in the AN-D reactors probably occurred due to the carbon source limitation resulting from the more rapid degradation under aerobic conditions than that under anaerobic conditions and resulting from oxygen inhibition under aerobic conditions [ 27 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

The Dynamic Response of Nitrogen Transformation to the Dissolved Oxygen Variations in the Simulated Biofilm Reactor

Zhang

Chen

et al. 2021

IJERPH

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Lab-scale simulated biofilm reactors, including aerated reactors disturbed by short-term aeration interruption (AE-D) and non-aerated reactors disturbed by short-term aeration (AN-D), were established to study the stable-state (SS) formation and recovery after disturbance for nitrogen transformation in terms of dissolved oxygen (DO), removal efficiency (RE) of NH4+-N and NO3−-N and activity of key nitrogen-cycle functional genes amoA and nirS (RNA level abundance, per ball). SS formation and recovery of DO were completed in 0.56–7.75 h after transition between aeration (Ae) and aeration stop (As). In terms of pollutant REs, new temporary SS formation required 30.7–52.3 h after Ae and As interruptions, and seven-day Ae/As interruptions required 5.0% to 115.5% longer recovery times compared to one-day interruptions in AE-D and AN-D systems. According to amoA activity, 60.8 h were required in AE-D systems to establish new temporary SS after As interruptions, and RNA amoA copies (copy number/microliter) decreased 88.5%, while 287.2 h were required in AN-D systems, and RNA amoA copies (copy number/microliter) increased 36.4 times. For nirS activity, 75.2–85.8 h were required to establish new SSs after Ae and As interruptions. The results suggested that new temporary SS formation and recovery in terms of DO, pollutant REs and amoA and nirS gene activities could be modelled by logistic functions. It is concluded that temporary SS formation and recovery after Ae and As interruptions occurred at asynchronous rates in terms of DO, pollutant REs and amoA and nirS gene activities. Because of DO fluctuations, the quantitative relationship between gene activity and pollutant RE remains a challenge.

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“…The rate of oxidation of ammonium nitrogen during nitrification is influenced by: dissolved oxygen concentration, pH, total alkalinity, ammonia concentration [34][35][36], C/N ratio [37][38][39], temperature and the presence of inhibitors [40][41][42]. Moreover, in order to prevent the removal of nitrifying bacteria from the system and to maintain a constant effect of NH 4 -N oxidation, a sufficiently long age of the activated sludge and biomass reserve should be ensured [43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Toxic Effect of Ammonium Nitrogen on the Nitrification Process and Acclimatisation of Nitrifying Bacteria to High Concentrations of NH4-N in Wastewater

et al. 2021

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The aim of the conducted research was to assess the effectiveness of the nitrification process, at different concentrations of ammonium nitrogen, in biologically treated wastewater in one of the largest municipal and industrial wastewater treatment plants in Poland. The studies also attempted to acclimate nitrifying bacteria to the limited concentration of ammonium nitrogen and determined the efficiency of nitrification under the influence of acclimated activated sludge in the biological wastewater treatment system. The obtained results indicate that the concentration of ammonium nitrogen above 60.00 mg·dm−3 inhibits nitrification, even after increasing the biomass of nitrifiers. The increase in the efficiency of the nitrification process in the tested system can be obtained by using the activated sludge inoculated with nitrifiers. For this purpose, nitrifiers should be preacclimated, at least for a period of time, allowing them to colonize the activated sludge. The acclimated activated sludge allows reducing the amount of ammonium nitrogen in treated sewage by approx. 35.0%. The process of stable nitrification in the biological treatment system was observed nine days after introducing the acclimated activated sludge into the aeration chamber.

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Advanced strategies to improve nitrification process in sequencing batch reactors - A review

Cited by 68 publications

References 101 publications

Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier

Nitrification in the presence of sulfide and organic matter in a sequencing moving bed biofilm reactor (SMBBR) with zeolite as biomass carrier

The Dynamic Response of Nitrogen Transformation to the Dissolved Oxygen Variations in the Simulated Biofilm Reactor

Toxic Effect of Ammonium Nitrogen on the Nitrification Process and Acclimatisation of Nitrifying Bacteria to High Concentrations of NH4-N in Wastewater

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