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Concentration polarization

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... were employed to investigate the mass transfer of BBP away from the membrane surface during nanofiltration. The results showed that the BBP concentration in concentration polarization (CP) layer increased as permeate flux increased due to enhanced convection as well as for the positively charge ...
Desalination 250 (2009)

... on the Nernst-Planck and Poisson equations is developed. A three-layer system is considered: the membrane and two adjacent diffusion layers. Concentration profiles in the three layers, effective transport numbers as functions of the current and current-voltage characteristics are calculated.
Desalination 147 (2002)

... water. In this study, rotating RO, which takes advantage of Taylor-Couette flow instabilities to reduce the flux decline related to concentration polarization and membrane fouling, was investigated experimentally and compared to a dynamic model based on RO membrane transport incorporatin ...
Desalination 146 (2002)

A theoretical analysis of the effect of random fiber packing on shell flow distribution, associated shell-side concentration boundary layers, and ultimate performance of shell-fed hollow-fiber gas separation modules is presented. Specifically the relationship between... by over an order of magnitude, though, before the effect becomes significant. Keywords: Gas separation; Hollow-fiber module; Concentration polarization; Channeling 1. Background Hollow-fiber membrane modules are used for a number of industrial gas separations [1]. As membrane materials improve ...
Desalination 146 (2002)

A primary reason for flux decline during the initial period of a membrane separation process is concentration polarization of the solute at the membrane surface. The objective of the present study was to analyze and model concentration polarization i ...
Desalination 146 (2002)

In this paper the relationship between liquid velocity and the concentration of components in the premeate is described for capillary nanofiltration (NF) membranes. Capillary NF combines the advantages of NF — good... the system. The different permeate concentrations for different liquid velocities can be explained entirely by the effect of the concentration polarization. The first experiments confirm that retention is a membrane characteristic. 1. For higher velocities the permeate quality increases. This firs ...
Desalination 139 (2001)

DESALINATION Desalination 131 (2000) 225-236 ELSEVIER T he effect of shear rate on controlling the concentration polarization and membrane fouling R . Bian a, K. Yamamoto a, Y. Watanabe b* b ~Product Development Department, Environmental System Division ...
Desalination 131 (2000)

... (MB) was used as a model dye. Batch experiments were conducted on dilute MB-water mixtures using a tubular polypropylene membrane module. The concentration of MB dye within the feed reservoir was monitored over time. The impact of operating variables such as feed temperature, flow rate and initial... as feed temperature, flow rate and initial dye concentration was investigated. A mathematical model incorporating temperature and concentration polarization effects was developed and validated on the experimental data. This work demonstrated the ability of VMD to treat wastewaters contaminated wit ...
Desalination 174 (2005)

... can be used as an alternative to traditional brine treatment technologies due to its low energy requirement. In this study, the feasibility of concentration of brine by the FO process was investigated using a laboratory-scale unit. An FO membrane and the dense selective layers (i.e. with their... the highest water flux because it had a relatively high hydrophilicity and was thinner that minimized the occurrence of internal concentration polarization. SEM images of the surfaces of the dense selective layers of both the CA and AD membranes displayed non-porous structures, which contributed t ...
Desalination 224 (2008)

Removal of hexavalent chromium (Cr+6) was carried out with different nanofiltration (NF) membranes for varying concentration and pH of the membrane feed solution. Two membranes were used for this investigation: one high rejection membrane (NFI) and the other a low... pH for membrane separation of chromium has been explained with the help of this spectrograph. Keywords: Chromium; Nanofiltration; Concentration polarization; Chromium UV spectra 0011-9164/08/$– See front matter © 2008 Elsevier B.V. All rights reserve ...
Desalination 219 (2008)

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