Fouling mitigation in tubular membranes by 3D-printed turbulence promoters

Armbruster, Sarah; Cheong, Oskar; Lölsberg, Jonas; Popović, Sanja; Yüce, Süleyman; Weßling, Matthias

doi:10.1016/j.memsci.2018.02.015

Cited by 77 publications

(39 citation statements)

References 28 publications

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“…On the contrary, slurry particles require more turbulent flow regimes, which force particles to mix and increase the contact between particles and the current collector. A simple approach to increasing the turbulent flow is using static mixers in membrane separation and electrochemical processes . Static mixers are flow promoters that induce additional secondary flows to the flow field; therefore, they help to mitigate the mass transport related limitations.…”

Section: Introductionmentioning

confidence: 99%

On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery

Perçin

Zee

2020

ChemElectroChem

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We studied the half-cell performance of a slurry-based vanadium redox flow battery via the polarization and electrochemical impedance spectroscopy methods. First, the conductive static mixers are examined and lower ohmic and diffusion resistances are shown. Further analyses of the slurry electrodes for the catholyte (VO 2 + À VO 2 + ) and anolyte (V 3 + À V 2 + ) are presented for the graphite powder slurry containing up to 15.0 wt.% particle content. Overall, the anolyte persists as the more resistive half-cell, while ohmic and diffusion-related limitations are the dominating resistances for both electrolytes. The battery is further improved by the addition of Ketjen black nanoparticles, which results in lower cell resistances. The best results are achieved when 0.5 wt.% Ketjen black nanoparticles are dispersed with graphite powder since the addition of nanoparticles reduces ohmic, charge transfer and mass diffusion resistances by improving particle-particle dynamics. The results prove the importance of understanding resistances in a slurry electrode system.

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Section: Introductionmentioning

confidence: 99%

On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery

Perçin

Zee

2020

ChemElectroChem

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“…Comparing the relative increase of the permeate flux and ER, in the case of the Kenics and the twisted tape static mixer application (Armbruster et al, ; Ikonić, Jokić, et al, ), it can be concluded that the Kenics static mixer provides higher values of the permeate flux as a consequence of the static mixer construction (a set of right and left helicoidal elements) that enables flow sharing, as well as rotational flow around each element, causing intense radial fluid mixing, which is very important in the case of starch suspension filtration. However, the positive values of ER are achieved only at low values of suspension flow rates, in both cases.…”

Section: Resultsmentioning

confidence: 99%

Artificial neural network modeling and optimization of wheat starch suspension microfiltration using twisted tape as a turbulence promoter

Ikonić

Bera

Pavličević

et al. 2019

J Food Process Preserv

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The aim of this study was the modeling and optimization of the turbulence promoter‐assisted starch suspension microfiltration process using artificial neural networks. The main aim was to analyze the influence of process parameters (transmembrane pressure, suspension flow rate, and concentration) on permeate flux (with and without twisted tape) and energy consumption in order to find the optimal combination of process parameters needed for the efficient use of the turbulence promoter. The obtained results showed a very good agreement between artificial neural network predictions and experimental data. Permeate flux was mostly influenced by suspension concentration, while the suspension flow rate had the highest impact on the reduction of the specific energy consumption. Performed optimization, using a genetic algorithm, indicated that microfiltration process should be carried out at the maximum value of transmembrane pressure (0.9 bar), at a suspension flow rate in the range from 80 to 93 L/hr, and at a suspension concentration of 5 g/L. Practical applications Practical application of this research presents the possibility for the wastewater treatment in the wheat starch processing industry that produces a significant amount of wastewater annually, mainly consisting of starch. Adequate treatment of wastewater can recover water‐soluble and partly suspended substances from the raw material and at the same time, recycle and purify wastewater prior to releasing to the ecosystem. In the last decades, cross‐flow microfiltration has shown many advantages in wastewater treatment operations comparing to conventional methods. In this research, cross‐flow microfiltration with twisted tape, as a turbulence promoter, is chosen in order to achieve higher values of permeate flux, simultaneously, by paying attention on energy efficiency. The multi‐response optimization, performed by applying the genetic algorithm, enables the determination of process parameters necessary for the accomplishment of economic and cost‐effective microfiltration process.

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“…As far as inserts are concerned, static mixers [23] inducing chaotic advection [24,25] in a laminar flow regime is the most efficient way of utilizing inserts in crossflow filtration [12,26,27]. If chaotic advection takes place in a crossflow filtration system, it leads to chaotic trajectories of fluid particles even in a simple laminar flow condition, preventing suspended particles or solute from adsorbing on the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization for a Microfluidic Crossflow Filtration System Incorporating a Micromixer

et al. 2019

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In this study, we report on a numerical study on design optimization for a microfluidic crossflow filtration system incorporated with the staggered herringbone micromixer (SHM). Computational fluid dynamics (CFD) and the Taguchi method were employed to find out an optimal set of design parameters, mitigating fouling in the filtration system. The flow and the mass transfer characteristics in a reference SHM model and a plain rectangular microchannel were numerically investigated in detail. Downwelling flows in the SHM model lead to backtransport of foulants from the permeable wall, which slows down the development of the concentration boundary layer in the filtration system. Four design parameters -the number of grooves, the groove depth, the interspace between two neighboring grooves, and the interspace between half mixing periodswere chosen to construct a set of numerical experiments using an orthogonal array L 9 (3 4 ) from the Taguchi method. The Analysis of Variance (ANOVA) using the evaluated signal-to-noise (SN) ratios enabled us to identify the contribution of each design parameter on the performance. The proposed optimal SHM model indeed showed the lowest growth rate of the wall concentration compared to other SHM models.

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Fouling mitigation in tubular membranes by 3D-printed turbulence promoters

Cited by 77 publications

References 28 publications

On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery

On the Resistances of a Slurry Electrode Vanadium Redox Flow Battery

Artificial neural network modeling and optimization of wheat starch suspension microfiltration using twisted tape as a turbulence promoter

Design Optimization for a Microfluidic Crossflow Filtration System Incorporating a Micromixer

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