Novel operational strategy for partial nitrification to nitrite in a sequencing batch rotating disk reactor

Antileo, Christian; Werner, Arne; Ciudad, Gustavo; Muñoz, Carlos; Bornhardt, C.; Jeison, David; Urrutia, Homero

doi:10.1016/j.bej.2006.09.003

Cited by 42 publications

(17 citation statements)

References 33 publications

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“…Aiming at lowering the oxygen demand and reducing or avoiding organic substrate requirement, the newly developed processes are essentially based on partial nitrification of ammonium to nitrite (Galí et al, 2006;Fux et al, 2002;Mosquera-Corral, et al, 2005;Ciudad et al, 2005). To achieve the shortcut of nitrate formation, the potential strategies for the stable nitrite accumulation include the control of operating variables such as pH, hydraulic retention time (HRT), solid retention time (SRT), dissolved oxygen (DO) concentration, temperature (Ruiz et al, 2003;Kim et al, 2006;Tseng et al,1998;Bougard et al, 2006), and the screening of different reactor configurations such as SHARON reactor and sequencing batch reactor (SBR) (Fux et al, 2006;Galí et al, 2006;Antileo et al, 2006;Chuang et al, 2007). The control of an appropriate DO concentration is one of the most practical strategies to achieve nitrification via nitrite.…”

Section: Introductionmentioning

confidence: 99%

Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process

Guo

Kim²,

Behera

et al. 2008

Int. J. Environ. Sci. Technol.

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This study investigated the influence of dissolved oxygen concentration and aeration time on nitrification and nitrite accumulation in an attempt to optimize the recently developed biological-partial-nitritation process for the treatment of strong nitrogen wastewaters. Investigation of dissolved oxygen concentration on ammonium and nitrite oxidation was carried out in a batch reactor. The dissolved oxygen concentration of 0.5 mg O 2 /L inhibited both ammonium as well as nitrite oxidation, while increase of dissolved oxygen concentration to ~1 mg O 2 /L increased the ammonium oxidation rate and was comparable to that at higher dissolved oxygen concentrations. Experiments were carried out in a sequencing batch reactor for more than 100 days to investigate the influence of aeration time on nitrite accumulation. The dissolved oxygen concentration was controlled at ~1.0 mg O 2 /L (in the range of 0.8-1.5 mg/L) during the aeration stage, and volatile suspended solid was maintained at 2.0 g/L while temperature and pH were 30±1ºC and 8.3±0.1, respectively. In a typical cycle, complete nitrification occurred at aeration time longer than 6 h. When the aeration time was reduced to 4 h., ~80 % of partial nitritation was achieved. With a further reduction in aeration time to 3 h., nearly 1:1 nitrite/ammonium ratio was yielded. This result revealed that for the reactor design, aeration time determined by feasibility experiments must be considered based on the nitrogen strength in wastewater and biomass concentration in the reactor with dissolved oxygen concentration of ~1.0 mg O 2 /L for satisfactory partial nitrification with subsequent processes such as anaerobic ammonium oxidation.

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Section: Introductionmentioning

confidence: 99%

Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process

Guo

Kim²,

Behera

et al. 2008

Int. J. Environ. Sci. Technol.

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show abstract

“…However, partial nitrification to nitrite in continuous reactors might be achieved by switching from the batch start-up into continuous operation. Recently, a number of operational factors for achieving partial nitrification to nitrite have been investigated mainly in SBRs, which demonstrated low DO concentration (Aslan et al 2009;Blackburne et al 2008a;Ye and Zhang 2010), high temperatures (Kim et al 2008), relatively high FA and free nitrous acid (FNA) concentrations Yamamoto et al 2008;Aslan and Dahab 2008), on-line aeration duration control (Guo et al 2009a;Lemaire et al 2008;Antileo et al 2006;Jubany et al 2008;Peng et al 2004;Blackburne et al 2008b), appropriate sludge age (Gee and Kim 2004;Hellinga et al 1998), saline inhibition (Ye et al 2009;Sudarno et al 2010), and periodic anoxic disturbances (Kornaros et al 2010;Kornaros et al 2008) were favorable for selectively inhibiting or limiting the growth of NOB. The control of aeration duration is one of economically feasible methods, since appropriated aeration duration can save the oxygen consumption.…”

Section: Discussionmentioning

confidence: 99%

Achieving nitrite accumulation in a continuous system treating low-strength domestic wastewater: switchover from batch start-up to continuous operation with process control

Peng

Guo

Horn

et al. 2011

Appl Microbiol Biotechnol

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Although biological nitrogen removal via nitrite is recognized as one of the cost-effective and sustainable biological nitrogen removal processes, nitrite accumulation has proven difficult to achieve in continuous processes treating low-strength nitrogenous wastewater. Partial nitrification to nitrite was achieved and maintained in a lab-scale completely stirred tank reactor (CSTR) treating real domestic wastewater. During the start-up period, sludge with ammonia-oxidizing bacteria (AOB) but no nitrite-oxidizing bacteria (NOB) was obtained by batch operation with aeration time control. The nitrifying sludge with the dominance of AOB was then directly switched into continuous operation. It was demonstrated that partial nitrification to nitrite in the continuous system could be repeatedly and reliably achieved using this start-up strategy. The ratio of dissolved oxygen to ammonium loading rate (DO/ALR) was critical to maintain high ammonium removal efficiency and nitrite accumulation ratio. Over 85% of nitrite accumulation ratio and more than 95% of ammonium removal efficiency were achieved at DO/ALR ratios in an optimal range of 4.0-6.0 mg O(2)/g N d, even under the disturbances of ammonium loading rate. Microbial population shift was investigated, and fluorescence in situ hybridization analysis indicated that AOB were the dominant nitrifying bacteria over NOB when stable partial nitrification was established.

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“…Therefore, the distribution of substrate concentration along the length (space) of a conventional activated plant varies with time. Several studies done in SBRs with partial nitrification [3,7,11,12] have showed good applications of this technique.…”

Section: Introductionmentioning

confidence: 97%

Modeling of partial nitrification and denitrification in an SBR for leachate treatment without carbon addition

Hoang

Jupsin

Le³

et al. 2012

J Mater Cycles Waste Manag

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A process of partial nitrification and denitrification in a sequencing batch reactor (SBR) treating leachate was simulated by applying a modified version of activated sludge model no. 3 (ASM3), named ASM3_ 2step. This model modifies the ASM3 model by separating nitrification and denitrification into two steps with nitrite as an intermediate substrate. Three periods, including long term period, steady state and cycle evolution, were used for calibration. Three main processes were observed, including biomass production, nitrification (focusing on nitrite accumulation) and denitrification. The kinetic and stoichiometric parameters (l A NH ,, were determined from biokinetic and respirometry tests. Some of the default values of kinetic and stoichiometric parameters available in the ASM3 model and in the literature were kept constant, while some others were adjusted step by step until observed state variables fit with experimental data. The maximum specific growth rate of nitrite oxidizing bacteria (0.108 day -1 ) (simulated by the model) and that of ammonium oxidizing bacteria (0.61 day -1 ) (from biokinetic tests) are the parameters which have the highest influence on the nitrite accumulation, even more than oxygen supply intensity or Kla value. Other important parameters were K AO NH and K AO NO 2 , calibrated at the values of 1.37 and 1.59 mg O 2 /L, respectively. The modified model and values of the kinetic and stoichiometric parameters obtained from the modeling process will be used for optimization of the partial nitrification in the next study. Keywords Modeling Á Nitrite accumulation Á Leachate Á SBR List of symbols Model parameters k h Hydrolysis rate constant [g COD/(g COD day)] b A O 2Aerobic endogenous respiration rate of X A

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Novel operational strategy for partial nitrification to nitrite in a sequencing batch rotating disk reactor

Cited by 42 publications

References 33 publications

Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process

Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process

Achieving nitrite accumulation in a continuous system treating low-strength domestic wastewater: switchover from batch start-up to continuous operation with process control

Modeling of partial nitrification and denitrification in an SBR for leachate treatment without carbon addition

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