CFD simulations of membrane filtration zone in a submerged hollow fibre membrane bioreactor using a porous media approach

Wang, Yuan; Brannock, Matthew; Cox, Shane; Leslie, Greg

doi:10.1016/j.memsci.2010.07.008

Cited by 84 publications

(31 citation statements)

References 12 publications

(18 reference statements)

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“…Transient pressure and velocity contours CFD studies 30,42 on the entire module were often implemented by treating the whole domain, i.e., the shell and lumen sides and the porous membrane zone as porous media with proper friction and porosity distribution and then the phase average velocity and pressure field can be obtained through simulation. Nevertheless, this treatment has eliminated the characteristic of flow field in the HFMMs, namely the mass and momentum coupling among the shell, lumen sides, and porous zone, which is different from the flow field in a packed tower or a fixed-bed reactor.…”

Section: Resultsmentioning

confidence: 99%

Three‐dimensional simulation of the time‐dependent fluid flow and fouling behavior in an industrial hollow fiber membrane module

Zhuang

Dai

2018

AIChE Journal

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A novel three‐dimensional CFD model has been developed on the basis of fluid flow in the shell and lumen sides, and permeation and fouling behavior in the porous membrane zone. The simulated 25‐min dead‐end outside‐in filtration process showed that the energy consumed by the inlet manifold decreases during the constant pressure filtration. The velocity and pressure distributions in the module change with time. Flux distribution both in the axial and radial directions becomes increasingly more uniform, so does the cake distribution. Flux distribution and cake distribution inter‐adjust each other in different modes. A correlation equation has been developed to describe the relationship between the volumetric flow rate and accumulated water production. The correlation equation with simple experiment enables the dynamic evolution of energy consumed by shell inlet manifold to be presented, which can be the criterion of how well the shell inlet manifold or module has been designed. © 2018 American Institute of Chemical Engineers AIChE J, 64: 2655–2669, 2018

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Section: Resultsmentioning

confidence: 99%

Three‐dimensional simulation of the time‐dependent fluid flow and fouling behavior in an industrial hollow fiber membrane module

Zhuang

Dai

2018

AIChE Journal

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“…Considering the remarks in the previous part, the geometry of the domain was annular and the membrane bundle was simulated as a wall. Some authors have simulated the hollow-fiber bundle as a porous medium [35,36]. This was not done in our case since it was not necessary for the proposed approach and was time-consuming from the computational point of view.…”

Section: Geometry and Meshingmentioning

confidence: 99%

Impact of Aeration on Mixed Liquor in Submerged‐Membrane Bioreactors for Wastewater Treatment

et al. 2017

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In submerged-membrane bioreactors (SMBRs) for wastewater treatment, aeration with coarse bubbles is applied to limit fouling. The understanding of the different mechanisms between aeration and fouling helps to manage the aeration policy. The impact of aeration (macro scale) on shear stress and mixed-liquor properties (local scale) is evaluated. Experimental characterization of gas-liquid flow in membrane modules, computational fluid dynamics simulation, and controlled breakdown of SMBR mixed-liquor samples are reported. Mean bubble velocities were significantly lower in mixed liquor than in water and the shear stress was one order of magnitude higher in mixed liquor than in water. The floc size decreased and soluble protein concentrations increased with higher shear stress values. Considering the known impacts of these mixed-liquor properties on fouling, the obtained local results explain stronger fouling when coarse bubble aeration increases.

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“…Rather than to consider distinctive topographies and inventory durations inside porous media, it approximately simulates pressure variations by a filtered fluid in the x, y, z directions (3-D) at a fixed surface velocity via Eqs. (5) and (6) [37,38]. But if across the nanostructure AMO particles in the AC layer which were involved in a cycle of valence-electron transition and also a porous capture in the benzene mineralization, the pressure variations between the heterogeneous fluids (i. e., AMO&PMS solutions and benzene gas) would result from mass adsorption and flow retention, in addition to the decomposition and penetration of reactant molecules when the catalytic oxidations start.…”

Section: Weighting Analysis By a Novel Numeric Modelmentioning

confidence: 99%

Peroxymonosulfate activated by amorphous particulate MnO2 for mineralization of benzene gas: Redox reaction, weighting analysis, and numerical modelling

Lee

Wang

et al. 2017

Chemical Engineering Journal

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Amorphous particulate MnO 2 (AMO) which features micro-nano hierarchical structure can be viewed as a favorable alternative to crystalline α-MnO 2 for Peroxymonosulfate (PMS) activation. The former not only is comparatively simple to obtain but also has similar performance on powerful adsorption and catalytic capability.In this paper, the combined use of AMO and PMS oxidizing system showed the paralleled degradation efficiency of benzene gas with 50.5±3.75%, which was just around 5 percentage points lower than that achieved in the α-MnO 2 &PMS system.Highly stable catalytic activity of the AMO&PMS system exhibited during an ensuing cyclic experiment, averaging at 63.08% for benzene mineralization. Additionally, a novel method of weighting analysis which evaluates the synergetic effects among operating parameters on benzene removal was firstly explored in the nanosized catalyst-based activation system. Through a novel specific reaction drag model for porous media, specific drag coefficients at various testing conditions, k 2 , in terms of pressure drop across microporous AMO, were held to establish the correlations between ideal mineralization efficiencies and optimal parameter combinations. A further comparison between laboratory data and model simulations confirmed that, regardless of pH variations, the mineralization rate can be enhanced to around 67.7% at a more higher temperature (45 o C) when the consumed ratio of AMO to PMS leveled off at 0.8, during which time much lower k 2 of 0.24 Pa·min·m/mg would present.

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CFD simulations of membrane filtration zone in a submerged hollow fibre membrane bioreactor using a porous media approach

Cited by 84 publications

References 12 publications

Three‐dimensional simulation of the time‐dependent fluid flow and fouling behavior in an industrial hollow fiber membrane module

Three‐dimensional simulation of the time‐dependent fluid flow and fouling behavior in an industrial hollow fiber membrane module

Impact of Aeration on Mixed Liquor in Submerged‐Membrane Bioreactors for Wastewater Treatment

Peroxymonosulfate activated by amorphous particulate MnO2 for mineralization of benzene gas: Redox reaction, weighting analysis, and numerical modelling

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