Modelling the effect of oxygen concentration on nitrite accumulation in a biofilm airlift suspension reactor

Picioreanu, Cristian; Loosdrecht, Mark C.M. van; Heijnen, J. J.

doi:10.2166/wst.1997.0034

Cited by 132 publications

(70 citation statements)

References 15 publications

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“…The dissolved oxygen half-saturation coefficients of AOB and NOB are 0.2-0.4 mg/l and 1.2-1.5 mg/l, respectively (Picioreanu et al 1997). Therefore, low DO concentration is more restrictive for the growth of NOB than AOB, which will result in nitrite accumulation (Peng et al 2004a).…”

Section: Dissolved Oxygen Concentrationmentioning

confidence: 99%

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Peng

Zhu

2006

Appl Microbiol Biotechnol

517

230

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Presently, the wastewater treatment practices can be significantly improved through the introduction of new microbial treatment technologies. To meet increasingly stringent discharge standards, new applications and control strategies for the sustainable removal of ammonium from wastewater have to be implemented. Partial nitrification to nitrite was reported to be technically feasible and economically favorable, especially when wastewater with high ammonium concentrations or low C/N ratios is treated. For successful implementation of the technology, the critical point is how to maintain partial nitrification of ammonium to nitrite. Partial nitrification can be obtained by selectively inhibiting nitrite oxidizing bacteria through appropriate regulation of the system's DO concentration, microbial SRT, pH, temperature, substrate concentration and load, operational and aeration pattern, and inhibitor. The review addressed the microbiology, its consequences for their application, the current status regarding application, and the future developments.

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Section: Dissolved Oxygen Concentrationmentioning

confidence: 99%

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Peng

Zhu

2006

Appl Microbiol Biotechnol

517

230

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“…Oxygen is often the limiting substrate in nitrifying biofilm systems as evident from the short penetration depth of oxygen in these biofilms (de Beer et al, 1993;Horn, 1994;LaPara et al, 2006;Okabe et al, 1999). In addition, bulk oxygen concentration has been shown in a previous modeling study to be a key operating condition in biofilm reactors to obtain partial nitrification (Picioreanu et al, 1997).…”

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confidence: 99%

Conditions for partial nitrification in biofilm reactors and a kinetic explanation

Pérez

Costa

Kreft

2009

Biotech & Bioengineering

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Nitrification is a two-step process in which ammonia is incompletely oxidized by ammonia-oxidizing bacteria or archaea (AOB) to nitrite, which is then further oxidized to nitrate by nitrite-oxidizing bacteria (NOB). Literature reports show that segregation of initially coexisting ammonia and nitrite oxidizing populations co-immobilized in gel cubes and cultured in a set-up with three reactors in series (without recirculation) is attained. In those studies NOB were present and nitrite was oxidized mainly in the last reactor. We developed a mathematical model for immobilized biomass that allows for one-dimensional gradients of metabolites and changes of porosity within the gel due to growth. The model reproduced the experimentally observed compartmentalization under the conditions used by Noto et al. (Noto et al., 1998. Water Res 32(3): 769- 773), using standard kinetic parameters of nitrifying bacteria including free ammonia inhibition of AOB and NOB. The model predicted compartmentalization when the ammonium load was sufficiently high and liquid phase mixing sufficiently limited (close to plug-flow). Modeling results demonstrated that inhibition of NOB by free ammonia did not substantially contribute to the compartmentalization in biofilm reactors. Additional simulations identified the higher oxygen affinity of AOB as the key parameter leading to compartmentalization (i.e., partial nitrification) in artificial and natural biofilms since they enable the formation of oxygen gradients. As a result, a tendency for compartmentalization was found even at equal competitiveness.

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“…The maximum substrate utilization rate ðqÞ and the half-maximum-rate concentration (K S ) were adjusted for temperature, as needed, by using 258C kinetic values from Rittmann and McCarty (2001) and temperature correction according to Novak (1974). Diffusion coefficients for nitrogen species and oxygen were taken from Picioreanu et al (1997). The values related to direct pH, FA, and FNA inhibitions were from Park et al (2007) and Park and Bae (2009).…”

Section: Kinetic Parametersmentioning

confidence: 99%

Multi‐species nitrifying biofilm model (MSNBM) including free ammonia and free nitrous acid inhibition and oxygen limitation

Park

Bae

Rittmann

2010

Biotech & Bioengineering

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A multi-species nitrifying biofilm model (MSNBM) is developed to describe nitrite accumulation by simultaneous free ammonia (FA) and free nitrous acid (FNA) inhibition, direct pH inhibition, and oxygen limitation in a biofilm. The MSNBM addresses the spatial gradient of pH with biofilm depth and how it induces changes of FA and FNA speciation and inhibition. Simulations using the MSNBM in a completely mixed biofilm reactor show that influent total ammonia nitrogen (TAN) concentration, bulk dissolved oxygen (DO) concentration, and buffer concentration exert significant control on the suppression of nitrite-oxidizing bacteria (NOB) and shortcut biological nitrogen removal (SBNR), but the pH in the bulk liquid has a weaker influence. Ammonium oxidation increases the nitrite concentration and decreases the pH, which together can increase FNA inhibition of NOB in the biofilm. Thus, a low buffer concentration can accentuate SBNR. DO and influent TAN concentrations are efficient means to enhance DO limitation, which affects NOB more than ammonia-oxidizing bacteria (AOB) inside the biofilm. With high influent TAN concentration, FA inhibition is dominant at an early phase, but finally DO limitation becomes more important as TAN degradation and biofilm growth proceed. MSNBM results indicate that oxygen depletion and FNA inhibition throughout the biofilm continuously suppress the growth of NOB, which helps achieve SBNR with a lower TAN concentration than in systems without concentration gradients.

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Modelling the effect of oxygen concentration on nitrite accumulation in a biofilm airlift suspension reactor

Cited by 132 publications

References 15 publications

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Conditions for partial nitrification in biofilm reactors and a kinetic explanation

Multi‐species nitrifying biofilm model (MSNBM) including free ammonia and free nitrous acid inhibition and oxygen limitation

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