Mass transfer, fluid flow and membrane properties in flat and corrugated plate hyperfiltration modules

Rácz, I.G.; Wassink, J.; Klaassen, Randy

doi:10.1016/0011-9164(86)85001-9

Cited by 44 publications

(21 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various other techniques such as pulsatile and reverse flow [11], vortex generators [12], corrugated membrane surface [13] and pretreatment of membrane surface [14] to prevent fouling have been used to enhance the permeate flux. The principal limitation to wider application of this technique is in the flux decline associated with concentration polarization and fouling of the membrane surface.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Gas Sparging in Cross-Flow Microfiltration of 2,3-Butanediol Fermentation Broth

Gupta¹,

Hashim

Ramachandran

et al. 2005

Eng. Life Sci.

View full text Add to dashboard Cite

Recovery of 2,3‐butanediol from a fermentation broth entails the separation of cells and other suspended solids as the initial step for subsequent separation stages. The aim of this work was to study the cross‐flow filtration of broth in the fermentation of 2,3‐butanediol from blackstrap molasses by Klebsiella oxytoca (NRRL B‐199). A plate type laboratory scale cross‐flow microfiltration unit with a 0.2‐μm cellulose acetate membrane was employed for this purpose. Preliminary results showed that the permeate flux would decline rapidly due to fouling caused by the natural impurities of blackstrap molasses, and modifications of the conventional cross‐flow filtration would be essential to achieve a filtration rate appropriate for practical purposes. In this work, the permeate flux was enhanced by air sparging, which scoured the membrane surface of colloidal deposits and allowed a practical filtration rate to be maintained. The average permeate flux increased by 39 % and 54 % for an air sparging rate of 0.5 L/min and 1.0 L/min respectively, in the case of an initial biomass concentration of 4.66 g/L. For an initial biomass concentration of 14.2 g/L, the flux increased by 105 % and 146 % for the gas rate of 0.5 and 1.0 L/min, respectively. It may be concluded that gas sparging is beneficial in cross‐flow filtration of thick suspensions like a fermentation broth.

show abstract

Section: Introductionmentioning

confidence: 99%

The Effect of Gas Sparging in Cross-Flow Microfiltration of 2,3-Butanediol Fermentation Broth

Gupta¹,

Hashim

Ramachandran

et al. 2005

Eng. Life Sci.

View full text Add to dashboard Cite

show abstract

“…Although it was observed experimentally that baffles placed on the membrane are effective in enhancing mass transfer by producing the vortices (Racz et al, 1986;Colman and Mitchell, 1990), few theoretical works have been reported in the literature. The purpose of this work is to investigate numerically the effect on CP of the turbulent flow with vortices induced by baffles of rectangular or triangular shapes.…”

Section: Membrane Modulementioning

confidence: 96%

“…Placing protuberances or corrugations directly onto the membrane surface has an influence on the mass transfer. Corrugations enhance mass transfer in more effective way than an increase in flow rate does (Racz et al, 1986). Colman and Mitchell (1990) investigated vortex mixing generated by pulsed flow to improve membrane performance.…”

Section: Membrane Modulementioning

confidence: 98%

The Effect of Vortices Induced by Baffles on Concentration Polarization

Chung

Kim

1996

Chemical Engineering Communications

View full text Add to dashboard Cite

A numerical analysis was performed to investigate the effect of recirculations formed by rectangular or triangular baffles on depolarization of concentration in a flat sheet membrane module. The k-[;turbulent model was used to predict the flow field in the flat channel. Control-volume-based finite difference methods were employed to solve for the two-dimensional fluid velocity and solute concentration distribulions. We examined rigorously the effect of various parameters including the velocity, diffusivity, perrneate flux, baffle size, baffle shape, and interbaffle spacing in an effort to find optimum operating conditions which may provide enhanced mass transfer. The vortices induced by the baffles on the membrane are found to be extremely effective in depolarizing the retained solutes at the membrane surface. The predictions show that baffle configurations and flow conditions have a great influence on depolarization of concentration. To achieve effective concentration depolarization, the baffle height should be greater than 0.5h (h = half the channel height) and the interbaffle spacing around 2h to 3h for the Reynolds number from 1,250 to 25,000. The simulated results indicate that the optimal Reynolds number is around 5,000 to 8,000 in view of both concentration polarization and energy consumption.

show abstract

“…In order to further increase efficiency while maintaining a stable operational performance, the control of concentration polarization and subsequent membrane fouling is of great importance [5]. Techniques shown to be effective include turbulence promoters [6,7], corrugated membrane surfaces [8], pulsatile flow [9] and vortex generation [10,11]. However, Bellara et al [12] demonstrated that injecting air bubble is a cheap and effective way of reducing concentration polarization and thus enhancing the permeate flux in hollow fiber membrane modules.…”

Section: Introductionmentioning

confidence: 97%

Using Computational Fluid Dynamics (CFD) and Particle Image Velocimetry (PIV) To Characterize Air and Water Two Phase Plug Flow Membrane Clean System

Liu¹,

Jordan²,

Kippax³

et al. 2009

proc water environ fed

View full text Add to dashboard Cite

Generally, two flow patterns existed in membrane bio-reactor; i.e. bubbly flow and plug flow. In this study, both numerical and experimental investigations were conducted to study the hydrodynamic behavior of a two phases (water-air) membrane bio-reactor (MBR) system under these two designated flow patterns. Particle image velocimetry (PIV) was adopted for experiment and computational fluid dynamics (CFD) was chosen as the numerical tool. In order to replicate experimental observations, the CFD model integrated Eulerian multiphase model with porous medium scheme and incorporated the vertically dependent filtration flux. A steady-state simulation was conducted for bubbly flow case and a transient simulation for plug flow case. Good agreements were achieved from the comparison between experiments and simulations.

show abstract

Mass transfer, fluid flow and membrane properties in flat and corrugated plate hyperfiltration modules

Cited by 44 publications

References 3 publications

The Effect of Gas Sparging in Cross-Flow Microfiltration of 2,3-Butanediol Fermentation Broth

The Effect of Gas Sparging in Cross-Flow Microfiltration of 2,3-Butanediol Fermentation Broth

The Effect of Vortices Induced by Baffles on Concentration Polarization

Using Computational Fluid Dynamics (CFD) and Particle Image Velocimetry (PIV) To Characterize Air and Water Two Phase Plug Flow Membrane Clean System

Contact Info

Product

Resources

About