Nitrification and AOB/NOB Populations in Integrated Fixed Film Activated Sludge: Measurements and Modeling

Kim, Hyun-Su; Pei, Ruoting; Boltz, Joshua P.; Gellner, James; Gunsch, Claudia K.; Freudenberg, Robert G.; Dodson, Robert; Schuler, Andrew J.

doi:10.2175/193864709793901635

Cited by 4 publications

(3 citation statements)

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“…increased. The bottom-right graph shows nitrification activity observed in the suspended growth of IFAS systems at other IFAS system studies (adapted from Choi, 2007, adapted from Kim et al, 2009, adapted from Onis-Hayden, 2007). Figure 7.…”

Section: Discussionmentioning

confidence: 99%

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Interactions Between Suspended Biomass and Biofilm in Integrated Fixed-Film Activated Sludge (IFAS) Bioreactors: Process Design Implications for IFAS Systems

McQuarrie¹,

Boltz²

2010

proc water environ fed

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A sensitivity analysis is conducted using a process model that considers the biofilm biochemical transformation processes, mass transfer resistances internal and external to the biofilm; and bacterial competition for space inside the biofilm along with the kinetics of the suspended growth component of IFAS systems. Results of the sensitivity analysis are compared with field trial observations. The paper proposes a design convention that considers the calculated nitrification safety factor to determine the configuration of the IFAS system design.

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Section: Discussionmentioning

confidence: 99%

“…Detailed operating data for both trains were collected and testing was conducted to assess activity under controlled conditions with the mixed liquor and plastic carriers in the IFAS system as well as the mixed liquor from the CAS system. Details of the pilot-scale systems are presented by Kim, et al (2009).…”

Section: Methodsmentioning

confidence: 99%

Interactions Between Suspended Biomass and Biofilm in Integrated Fixed-Film Activated Sludge (IFAS) Bioreactors: Process Design Implications for IFAS Systems

McQuarrie¹,

Boltz²

2010

proc water environ fed

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“…Mathematical models for hybrid complex, multi-species/multi-substrate systems comprising biofilms and suspended biomass have been proposed in the literature before, including for the nitrification process; see Boltz et al (2011, 2009a, 2009b, 2009c), Di Trapani et al (2010a, 2010b, Fouad and Bhargava (2005), Kim et al (2009), Mannina et al (2011), Randall (2008a, 2008b), and Thalla et al (2009Thalla et al ( , 2010. These earlier studies invoke one or more additional greatly simplifying assumptions to reduce the computational complexity of the overall model.…”

Section: Introductionmentioning

confidence: 99%

A Modeling and Simulation Study of the Role of Suspended Microbial Populations in Nitrification in a Biofilm Reactor

Mašić

Eberl

2013

Bull Math Biol

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Many biological wastewater treatment processes are based on bacterial biofilms, i.e. layered aggregates of microbial populations deposited on surfaces. Detachment and (re-)attachment leads to an exchange of biomass between the biofilm and the surrounding aqueous phase. Traditionally, mathematical models of biofilm processes do not take the contribution of the suspended, non-attached bacteria into account, implicitly assuming that these are negligible due to the relatively small amount of suspended biomass compared to biofilm biomass. In this paper, we present a model for a nitrifying biofilm reactor that explicitly includes both types of biomass. The model is derived by coupling a reactor mass balance for suspended populations and substrates with a full one-dimensional Wanner-Gujer type biofilm model. The complexity of this model, both with respect to mathematical structure and number of parameters, prevents a rigorous analysis of its dynamics, wherefore we study the model numerically.Our investigations show that suspended biomass needs to be considered explicitly in the model if the interests of the study are the details of the nitrification process and its intermediate steps and compounds. However, suspended biomass may be neglected if the primary interests are the overall reactor performance criteria, such as removal rates. Furthermore, it can be expected that changes in the biofilm area, attachment, detachment, and dilution rates are more likely to affect the variables primarily associated with the second step of nitrification, while the variables associated with the first step tend to be more robust.

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Influence of growth media and internal recycle rate on nitrogen removal from high-strength wastewater in a low footprint anoxic-upflow/aerobic process

Shams¹,

Singhal²,

Elefsiniotis³

2023

Journal of Environmental Chemical Engineering

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Nitrification and AOB/NOB Populations in Integrated Fixed Film Activated Sludge: Measurements and Modeling

Cited by 4 publications

References 0 publications

Interactions Between Suspended Biomass and Biofilm in Integrated Fixed-Film Activated Sludge (IFAS) Bioreactors: Process Design Implications for IFAS Systems

Interactions Between Suspended Biomass and Biofilm in Integrated Fixed-Film Activated Sludge (IFAS) Bioreactors: Process Design Implications for IFAS Systems

A Modeling and Simulation Study of the Role of Suspended Microbial Populations in Nitrification in a Biofilm Reactor

Influence of growth media and internal recycle rate on nitrogen removal from high-strength wastewater in a low footprint anoxic-upflow/aerobic process

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