Evaluation on membrane fouling by hydrophobic and hydrophilic substances through permeation coefficient and concentration polarization factor in SWRO processes

2018 ◽  
Vol 120 ◽  
pp. 16-22
Author(s):  
Jong-Woo Nam ◽  
Geon-Youb Kim ◽  
KiTae Park ◽  
Hyung-Soo Kim ◽  
Ji-Hoon Kim
Keyword(s):  
Membrane Fouling ◽  
Concentration Polarization ◽  
Polarization Factor

Evaluation on cleaning efficiency and membrane fouling by permeation coefficient and concentration polarization factor in pilot-scale SWRO processes

2018 ◽  
Vol 120 ◽  
pp. 23-30
Author(s):  
Jong-Woo Nam ◽  
Geon-Youb Kim ◽  
Minjin Kim ◽  
Poo Reum Kim ◽  
Hyung-Soo Kim ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Concentration Polarization ◽  
Pilot Scale ◽  
Cleaning Efficiency ◽  
Polarization Factor

An experimental study on the effect of spacer on concentration polarization in a long channel reverse osmosis membrane cell

2010 ◽  
Vol 61 (8) ◽  
pp. 2035-2041 ◽  
Author(s):  
H. Mo ◽  
H. Y. Ng
Keyword(s):  
Membrane Fouling ◽  
Concentration Polarization ◽  
Permeate Flux ◽  
Membrane Channel ◽  
Organic Fouling ◽  
Integral Effect ◽  
Ro Membrane ◽  
Long Channel ◽  
Membrane Cell ◽  
Extra Resistance

This study was to experimentally investigate the performance and organic fouling behaviour in a 1-m long RO membrane channel with or without spacer for desalting. It was found that local permeate flux distributed heterogeneously along the long membrane channel without a spacer inserted due to exponential growth of concentration polarization, which also resulted in decreasing salt rejection and increasing organic fouling along the membrane channel in the downstream direction. This heterogeneity could be lessened by inserting a spacer into the channel, which mitigated concentration polarization due to the enhanced turbulence caused by a spacer, especially at the downstream portion of the channel. However, in the upstream of the channel, inserting a spacer exerted an additional vertical resistance which might counteract the effect of concentration polarization mitigation by a spacer and caused a lower permeate flux. This suggests that it is necessary to consider the integral effect of spacer for designing an RO membrane module and an overall RO system in order to prevent extra resistance, reduce concentration polarization and membrane fouling.

scholarly journals Purification of High Salinity Brine by Multi-Stage Ion Concentration Polarization Desalination

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Bumjoo Kim ◽  
Rhokyun Kwak ◽  
Hyukjin J. Kwon ◽  
Van Sang Pham ◽  
Minseok Kim ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Membrane Fouling ◽  
Concentration Polarization ◽  
Saline Water ◽  
Economic Feasibility ◽  
Ion Concentration ◽  
Membrane Area ◽  
Multi Stage ◽  
Ion Concentration Polarization ◽  
Brine Salinity

Abstract There is an increasing need for the desalination of high concentration brine (>TDS 35,000 ppm) efficiently and economically, either for the treatment of produced water from shale gas/oil development, or minimizing the environmental impact of brine from existing desalination plants. Yet, reverse osmosis (RO), which is the most widely used for desalination currently, is not practical for brine desalination. This paper demonstrates technical and economic feasibility of ICP (Ion Concentration Polarization) electrical desalination for the high saline water treatment, by adopting multi-stage operation with better energy efficiency. Optimized multi-staging configurations, dependent on the brine salinity values, can be designed based on experimental and numerical analysis. Such an optimization aims at achieving not just the energy efficiency but also (membrane) area efficiency, lowering the true cost of brine treatment. ICP electrical desalination is shown here to treat brine salinity up to 100,000 ppm of Total Dissolved Solids (TDS) with flexible salt rejection rate up to 70% which is promising in a various application treating brine waste. We also demonstrate that ICP desalination has advantage of removing both salts and diverse suspended solids simultaneously, and less susceptibility to membrane fouling/scaling, which is a significant challenge in the membrane processes.

scholarly journals Concentration Polarization Quantification and Minimization in Cork Process Wastewater Ultrafiltration by an Ozone Pretreatment

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2182
Author(s):  
Miguel Minhalma ◽  
Maria Norberta de Pinho ◽  
Joaquin R. Dominguez
Keyword(s):  
Mass Transfer ◽  
Molecular Weight ◽  
Membrane Fouling ◽  
Concentration Polarization ◽  
Film Theory ◽  
Operating Conditions ◽  
Direct Oxidation ◽  
Cellulose Acetate Membranes ◽  
Wide Range ◽  
Ozone Pretreatment

Concentration polarization and membrane fouling have been identified as the main problems during the ultrafiltration treatment of cork processing wastewaters. These problems drastically reduce the permeate fluxes and, therefore, their potential applications. In this work, a soft ozonation pretreatment was applied to minimize these undesirable effects. A new systematic study was carried out for membranes with different molecular weight cut-offs and at different operating conditions to monitor and quantify the concentration polarization caused by the wastewater’s remaining ozonated compounds. Film theory was used to correlate the mass transfer coefficient, k, and the intrinsic rejection coefficient, f′, with the resistance introduced by concentration polarization. The ultrafiltration treatment was carried out under varying hydrodynamic operating conditions (circulating flow rates of 100–200 L/h) and transmembrane pressures (1–3 bar) for a set of four cellulose acetate membranes covering a wide range of molecular weight cut-offs (5000–100,000 Da) and hydraulic permeabilities (25–110 kg/h/m2/bar). The ozone pretreatment (at wastewater pH) reduced the phenolic content selectively (direct oxidation) by more than 50%, reducing membrane fouling and concentration polarization and increasing permeate fluxes (by 22–45%) and mass transfer coefficients (up to six times).

Enhanced or reduced concentration polarization by membrane fouling in seawater reverse osmosis (SWRO) processes

Desalination ◽  
2009 ◽  
Vol 247 (1-3) ◽  
pp. 162-168 ◽  
Author(s):  
Suhan Kim ◽  
Sungyun Lee ◽  
Eunkyung Lee ◽  
Sarp Sarper ◽  
Chung-Hwan Kim ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Concentration Polarization ◽  
Seawater Reverse Osmosis

scholarly journals Application of Pulsed Electric Field in Antifouling Treatment of Sodium Gluconate Mother Liquor by Electrodialysis

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2501 ◽  
Author(s):  
Qi Gao ◽  
Zichao Li ◽  
Chunxiao Lei ◽  
Rongqiang Fu ◽  
Wei Wang ◽  
...  
Keyword(s):  
Electric Field ◽  
Membrane Fouling ◽  
Mother Liquor ◽  
Concentration Polarization ◽  
Organic Molecules ◽  
Membrane Surface ◽  
Pulsed Electric Field ◽  
Sodium Gluconate ◽  
Batch Treatment ◽  
Exchange Membrane

Contamination of ion exchange membranes is one of the major problems in electrodialysis. Among the solutions that have been proposed and tested to alleviate membrane fouling during electrodialysis so far, applying a pulsed electric field (PEF) at a fixed application time (Ton) followed by a pause time (Toff) has been proved to be effective. In this study, the PEF was applied to desalinate sodium gluconate mother liquor by ED. The experimental properties of conventional ED and pulsed ED and their effects on membrane fouling were compared. The results show that compared with conventional ED, pulsed ED can alleviate concentration polarization and enhance the performance of ED. Similarly, in the process of continuous batch treatment of mother liquor under the PEF condition, large organic molecules can be effectively prevented from depositing on the membrane surface. Therefore, an anion exchange membrane (AEM) under the condition of PEF is contaminated mainly by organic molecules with a relatively smaller size. Both the surface and interior of AEM membrane were affected by organic pollutants under conventional electric field (CEF) conditions.

A Review of Membrane Separation Process Enhanced by Shearing Force

2014 ◽  
Vol 1010-1012 ◽  
pp. 729-732
Author(s):  
Peng Wang ◽  
Yan He Han ◽  
Jia Qing Chen ◽  
Xiao Fei Zhang
Keyword(s):  
Membrane Fouling ◽  
Concentration Polarization ◽  
Membrane Separation ◽  
Separation Process ◽  
Membrane Technology ◽  
Shearing Force ◽  
Separation Technology

Due to the concentration polarization and membrane fouling, the application of conventional membrane separation technology is restricted. In order to reduce the concentration polarization and membrane fouling, the shear-enhanced process has become the focus of the current membrane technology. The shear-enhanced processes contain chiefly rotary tubular shear-enhanced process, rotary disc shear-enhanced process and vibratory shear-enhanced process. This article introduced the structures and work principles of the three shear-enhanced processes. Meanwhile, the problems and the prospect of the shear-enhanced process were provided in this article.

Hydrodynamic Modeling of the Helical Membrane Modules

2013 ◽  
Author(s):  
Fengxia Liu ◽  
Wei Wei ◽  
Guan Wang ◽  
Xiaofei Xu ◽  
Zhijun Liu ◽  
...  
Keyword(s):  
Shear Stress ◽  
Kinetic Energy ◽  
Numerical Simulations ◽  
Turbulent Kinetic Energy ◽  
Membrane Fouling ◽  
Concentration Polarization ◽  
Membrane Surface ◽  
Helical Angle ◽  
Flat Membrane ◽  
Membrane Modules

Membrane fouling and concentration polarization can be greatly mitigated by using the helical membrane modules to enhance the mass transport process. In this study, experiments and computational fluid dynamics were used to investigate the transport phenomena in a helical membrane filter with several helical membrane modules. A model is constructed with a square filter which has three helical membrane modules embedded as not only turbulence promoters but also filtering elements. Direct numerical simulations based on the Navier-Stokes equations are performed over a range of characteristic parameters of membrane and aeration flux. The distributions of local parameters such as velocity, shear stress and turbulent kinetic energy on the membrane surface were obtained by numerical simulations with different helical angle and aeration flux. These parameters are directly related to mass transport enhancement. Results show that both wall shear stress and turbulent kinetic energy obtained from helical membrane modules are larger than those from flat membrane modules, and they increase with an increase of the helical angle. The average shear stress on the membrane surface increases from 0.097 Pa to 0.217 Pa as the helical angle changes from 0° to 360°. In addition, the flow field was analyzed by means of noncontact measuring and visualization device-Particle Image Velocimetry (PIV), and the vorticity as well as the turbulent kinetic energy were obtained from the velocity distribution. The measured data are in agreement with the numerical results. From the research, we can see that the helical membrane modules can enhance the transfer efficiently compared to the flat membrane modules, which means the concentration polarization and membrane fouling can be alleviated efficaciously, it can be concluded that the helical membrane modules can play an important role in government actions membrane separation engineering and its application prospect in industry is very broad.

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