Dynamic Filtration with Rotating Disks, and Rotating or Vibrating Membranes

Ding, Luhui; Jaffrin, Michel Y.; Luo, Jianquan

doi:10.1016/b978-0-12-384746-1.00002-1

Cited by 17 publications

(11 citation statements)

References 60 publications

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“…The finite volume method 26,27 is applied for the numerical solution of differential equations ( 5) to ( 7), (11) and to determine all turbulence characteristics. The 3-rd order of quadratic upstream interpolation for convective kinematics scheme (QUICK-type scheme) 28 was applied for the discretization of convective transport terms.…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…[4][5][6][7][8][9] Its operation based on the principle of rotational filtration. 4,8,[10][11][12] In the rotating filter, the solid admixture particles have a value of relative tangential velocity component U ps much more than the value of relative normal velocity component U pn near the filter element surface (Figure 1). This is implemented as a result of the rotation filter element about its axis.…”

Section: Introductionmentioning

confidence: 99%

“…A detailed description of similarities and differences of this filter construction compared to other known filter constructions and their working parameters is widely presented in works. 11,13 The existing designs of the rotating filter with mesh filter element surface didn't provide good results in liquid cleaning. The practice and experiments demonstrate the limited progress of filtration with a mesh filter element.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and experimental tests of the filter with a rotating cylindrical perforated filter element

Brazhenko

Mochalin

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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There is a need to clean various liquids of solid impurities in almost all areas of human activity. The filter design with a rotating cylindrical perforated filter element was proposed to address this topical technical problem. Its work based on the principle of rotational filtration. The experimental studies demonstrated that with a rotating cylindrical perforated filter element could remove more than 90% of the admixture particles. This took place in defined fluid motion modes, which characterized by the dimensionless Reynolds numbers. In the present study, numerical simulation was carried out for an investigation of the hydraulic oil motion and solid admixture particles' motion in the filter. The simulation results showed a local increase velocity in the holes of the perforated filter element. It entails the passage of a very small particle number into the filtrate. A comparison of the numerical simulation results of filter cleaning efficiency with the data of physical experiments showed a rather good agreement, the discrepancy between which is less than 9%.

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Section: Numerical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and experimental tests of the filter with a rotating cylindrical perforated filter element

Brazhenko

Mochalin

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…These systems employ mechanical rotations or vibrations on the membrane module to generate substantially high membrane surface shear rates at magnitudes, sufficient to reduce concentration polarization (Ding, Jaffrin, & Luo, 2015;Jaffrin, 2008;Zsirai, Qiblawey, A-Marri, & Judd, 2016). The Vibratory Shear Enhanced Processing (VSEP) by New Logic Research, Inc. (Minden, NV) is one such system that employs torsional oscillations on the membrane module at resonant frequencies of up to 60 Hz (New Logic Research Inc., 2020).…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling of vibratory shear‐enhanced nanofiltration in the preconcentration of coffee extracts for soluble coffee manufacturing

Laurio

Yenkie

Eusebio

et al. 2021

J Food Process Engineering

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A semi-empirical model was applied to evaluate the performance of a vibratory nanofiltration (NF) system, using 150-Da TS80 NF membrane, for the preconcentration of coffee extracts in soluble coffee processing. The effects of transmembrane pressure (TMP), feed concentration, and module vibration on flux enhancement were correlated with membrane surface concentrations and fouling resistances under steady state operation. Vibratory shear thinned the boundary layer and increased the mass transfer coefficient of the solvent (water) by a factor of 3.5.Membrane surface concentrations and fouling resistances reduced by 60% compared with crossflow (CF) NF operation. These reductions enhanced permeate fluxes by about 2-3 times that of CF operation, with low flux decline. Feed concentration and TMP promoted polarization more than the negative effect of vibration. Osmotic pressure resistances were dominant under low feed concentrations and TMP. However, concentration polarization resistances exceeded osmotic pressure resistances as TMP and feed concentrations were increased. Real rejections relative to membrane surface chemical oxygen demand (COD) were above 0.99, indicating the potential of the operation to recover permeate that is reusable for ancillary plant operations.Overall, the experimental and theoretical permeate fluxes and CODs were in reasonable agreement, indicating the reliability of the model. Practical ApplicationsVibratory membrane processes alleviate the issues on membrane fouling that is advantageous when integrated into food and beverage processes. Its application as a coffee extract preconcentration alternative to thermal evaporation opens opportunities for sustainable soluble coffee production that can be adapted in other food and beverage industries. However, the unique dynamic nature of the vibratory membrane system challenges conventional approaches for understanding and predicting the mechanisms of the process. This gap limits the overall transferability of the technology to broader industry sectors. The semi-empirical resistance-in-series model developed in this study correlates the important factors with the vibratory NF performance based on fundamental concepts: concentration polarization, osmotic

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“…The mechanism of these systems have been thoroughly explained in literature 32‐34 and in previous studies associated to its application in soluble coffee wastewaters 25,35,36 . Known as vibratory shear enhanced processing (VSEP), these filtration systems use resonant frequencies up to ~50 Hz that impart high shear rates (>20,000 s −1 ) at the membrane feed surface, overcoming fouling to improve throughput rates, and favor membrane selectivity 37,38 . Like CFF, dynamic membrane systems employing vibration have been highly suggested for water purification, wastewater treatment, as well recovery of water and high‐value compounds for reuse 39 .…”

Section: Introductionmentioning

confidence: 99%

Environmental and process assessment of a vibratory nanofiltration system for the recovery of water from soluble coffee manufacturing waste

Wisniewski

Laurio

Slater

et al. 2020

Env Prog and Sustain Energy

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A case study has been conducted for the recovery of water from complex wastewater at a soluble coffee manufacturing factory. The study has evaluated separation methods for process intervention based on environmental and economic assessments. A novel vibratory field membrane separation was evaluated at the laboratory scale using actual factory wastewater, and was scaled‐up using appropriate design protocols. The recovery of water from an intermediate waste stream proved the most effective, both environmentally and economically. The proposed full‐scale vibratory membrane process recovers 378,541 L of water per day that meets specifications for reuse in the factory cooling tower. The proposed design reduced the daily well freshwater withdrawn by 21% and the amount of wastewater discharged from the factory by 28.5%. Annual operating costs were reduced by 22.5% and total life cycle emissions were reduced by 27.8%. These reductions are mainly the result of the reduced volume of wastewater discharged from the factory and the reduced energy requirement of the on‐site pretreatment processes. Economic assessment showed a net present value after 10 years is $181,100, while the payback time is under 3 years. Overall, the proposed vibratory membrane process used for water recovery presents favorable economics, and significant environmental emission reduction.

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Dynamic Filtration with Rotating Disks, and Rotating or Vibrating Membranes

Cited by 17 publications

References 60 publications

Numerical simulation and experimental tests of the filter with a rotating cylindrical perforated filter element

Numerical simulation and experimental tests of the filter with a rotating cylindrical perforated filter element

Mathematical modeling of vibratory shear‐enhanced nanofiltration in the preconcentration of coffee extracts for soluble coffee manufacturing

Environmental and process assessment of a vibratory nanofiltration system for the recovery of water from soluble coffee manufacturing waste

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