Evaluation of the Factors that Impact Successful Membrane Biological Reactor Operations at High Solids Concentration

Fabiyi, Malcolm; Novak, R. A.

doi:10.2175/193864708788803479

Cited by 10 publications

(9 citation statements)

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“…Using water as the liquid phase provided some velocity fields in the bubble column that differed from those obtained using activated sludge as the liquid phase; i.e., as the inlet gradually shifted from the center of the bubble Moreover, we found that the activated sludge as the liquid phase exhibited slightly higher volume-averaged bubble diameters than water as the liquid phase, except in cases 1 and 5; these findings were in accordance with the experimental observations of Fabiyi and Novak [46].…”

Section: Discussionsupporting

confidence: 90%

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CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

et al. 2017

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Abstract:A novel computational fluid dynamics-population balance model (CFD-PBM) for the simulation of gas mixing in activated sludge (i.e., an opaque non-Newtonian liquid) in a bubble column is developed and described to solve the problem of measuring the hydrodynamic behavior of opaque non-Newtonian liquid-gas two-phase flow. We study the effects of the inlet position and liquid-phase properties (water/activated sludge) on various characteristics, such as liquid flow field, gas hold-up, liquid dynamic viscosity, and volume-averaged bubble diameter. As the inlet position changed, two symmetric vortices gradually became a single main vortex in the flow field in the bubble column. In the simulations, when water was in the liquid phase, the global gas hold-up was higher than when activated sludge was in the liquid phase in the bubble column, and a flow field that was dynamic with time was observed in the bubble column. Additionally, when activated sludge was used as the liquid phase, no periodic velocity changes were found. When the inlet position was varied, the non-Newtonian liquid phase had different peak values and distributions of (dynamic) liquid viscosity in the bubble column, which were related to the gas hold-up. The high gas hold-up zone corresponded to the low dynamic viscosity zone. Finally, when activated sludge was in the liquid phase, the volume-averaged bubble diameter was much larger than when water was in the liquid phase.

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Section: Discussionsupporting

confidence: 90%

“…Moreover, we found that the activated sludge as the liquid phase exhibited slightly higher volume-averaged bubble diameters than water as the liquid phase, except in cases 1 and 5; these findings were in accordance with the experimental observations of Fabiyi and Novak [46]. …”

Section: Volume-average Bubble Diametersupporting

confidence: 91%

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

et al. 2017

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“…Here, the interaction between bubble formation, flow field and shear at the membrane surface requires detailed studies on AS viscosity. Fabiyi and Novak (2008) investigated the effects of elevated solid concentrations on the mass transfer characteristics for a wide range of mixing and aeration equipment. They observed a significant dependence of bubble size on viscosity values (changed through solids concentration).…”

Section: Introduction and Incentives To Measure And Model Rheology Fomentioning

confidence: 99%

“…Most of them are pure empirical models (correlation models) which either describe shear stress or apparent viscosity as a function of its predefined predictors (shear rate, yield stress). They are mainly inspired by the shape of the rheogram obtained experimentally, which can be described mathematically by a power law function or The width of the bubble plume is significantly smaller than the diameter of the sparger and the mean bubble size is much larger (Fabiyi and Novak, 2008). w a t e r r e s e a r c h 4 7 ( 2 0 1 3 ) 4 6 3 e4 8 2 a variation thereof, e.g.…”

mentioning

confidence: 99%

Activated sludge rheology: A critical review on data collection and modelling

et al. 2013

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“…High solids concentration in aerobic membrane bioreactors can lead to issues with sufficient aeration. However, in previous work (Fabiyi and Novak, 2008) it has been demonstrated that adequate oxygenation can be reliably provided through the application of high purity oxygen (HPO) for process aeration. Jang and Kim (2004) demonstrated that high dissolved oxygen (DO) concentrations significantly increased the removal efficiency of TKN.…”

Section: Introductionmentioning

confidence: 99%

Sidestream Centrate treatment using High Purity Oxygen Membrane Bioreactors (HPO– MBR) – Pilot studies

Gracia¹,

Larrea²,

Fabiyi³

2013

proc water environ fed

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The increasing regulatory demands to achieve greater nutrient removal have led to the development of several innovative biological nitrogen removal processes. This paper presents a novel approach based on the combination of membrane technology with the use of High Purity Oxygen (HPO) for the treatment of high strength centrate streams. The study is based on the results from a lab scale MBR pilot plant fed with centrate produced in a municipal WWTP with an anaerobic digestion process. The tests were run under a wide range of operational conditions of DO level, Temperature, HRT and pH. An intensive experimental campaign has been carried out including analytical measurements, online instrumentation, real-time estimations of OUR, a set of AUR batch tests, microbiological analysis and the application of modeling tools. The results indicate that the process can reliably provide up to 95% oxidation of ammonia with a notable effect of the DO level and Temperature on the Ammonia uptake rate. No inhibitions have been found that prevent the robust oxidation of ammonia in centrate streams and the microbiological analysis demonstrate that the use of HPO generates a robust and specialized nitrifier biomass community.

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Evaluation of the Factors that Impact Successful Membrane Biological Reactor Operations at High Solids Concentration

Cited by 10 publications

References 0 publications

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

Activated sludge rheology: A critical review on data collection and modelling

Sidestream Centrate treatment using High Purity Oxygen Membrane Bioreactors (HPO– MBR) – Pilot studies

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