Dynamic Membranes in Ultrafiltration and Reverse Osmosis

Tanny, G. B.

doi:10.1080/03602547808066063

Cited by 57 publications

(19 citation statements)

References 12 publications

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“…7 shows the˚values at different levels of V F and V W by the modified dip-coating method with a T F of 30 s. When V F reached a relatively high value, such as 30 mm s −1 or 50 mm s −1 , a value ofg reater than 80% could be obtained, as long as V W was maintained as low as 4 mm s −1 . As mentioned above, the capillary-filtration process was quick and effective, so a substantially high value of V F was indispensable in providing a sufficient scouring effect to assist the particle deposition by capillary-filtration, in order to obtain a uniform layer [14,17] and reduce the probability of pinhole defects occurring. The success in avoiding pinhole defects obtained in the step of support dipping also required a positive or at least nonnegative effect during the next step of support withdrawal.…”

Section: Probability Of Pinhole Avoidancementioning

confidence: 97%

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Modified dip-coating method for preparation of pinhole-free ceramic membranes

Zhu

Fan

2011

Journal of Membrane Science

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Section: Probability Of Pinhole Avoidancementioning

confidence: 97%

“…The dynamic membrane is actually a kind of cake or gel layer formed by the interaction of applied filtration pressure and the tangential flow of feed [14][15][16]. It has also been reported that dynamic membranes tend to be uniform and crack-free with the help of the tangential flow of feed [17].…”

Section: Introductionmentioning

confidence: 97%

Modified dip-coating method for preparation of pinhole-free ceramic membranes

Zhu

Fan

2011

Journal of Membrane Science

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“…Kaolin, lime and diatomaceous earth were often used as dynamic membranes in crossflow MF [8]. Tanny [9] studied the dynamically formed membrane in the MF with tap water using mineral species such as fluorspar, diatomite, kaolin, silicate flakes and limestone. The formation of dynamic membrane was divided into three categories [9].…”

Section: Introductionmentioning

confidence: 99%

Electrocoagulation and crossflow microfiltration hybrid system: fouling investigation

Sharma

Shon

Phuntsho

2012

Desalination and Water Treatment

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A B S T R A C TThe fouling study of crossflow microfiltration (MF) was comparatively studied with feedwater containing kaolin suspension with and without electrocoagulation (EC) pre-treatment. An acrylonitrile butadiene styrene (ABS) MF membrane of pore size 0.4 lm was used in this study. The experiments were carried out at three different concentration of kaolin (100, 400 and 800 mg/l) and with three different crossflow velocities of 0.5, 1 and 1.5 l/min. When the feedwater was pre-treated by EC, the fouling was found to follow standard law of filtration. Besides the standard filtration law, the fouling mechanism also followed the classical cake filtration model due to formation of a secondary membrane.

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“…The advantages of using dynamic membranes include "in-situ" formation and regeneration, reducing "downtime" in the operating apparatus, long support life, high permeating flux, mechanical stability, and durability at high temperature and under a wide range of pH (15)(16)(17). Active kaolin was selected in this work to form the dynamic membrane layer used for removing solid suspensions from a polymer fluid.…”

Section: Introductionmentioning

confidence: 99%

Dead-End Flow Filtration of Solid Suspension in Polymer Fluid through an Active Kaolin Dynamic Membrane

Wang¹,

Chou²,

Lee³

1998

Separation Science and Technology

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In this study an active kaolin dynamic membrane formed on a SS-316 porous support was used to investigate the microfiltration of a solid suspension in polymer fluid. It was found that a homogeneous sodium acetate suspension in polymer can be completely removed by the active kaolin dynamic membrane to yield a very clear polymer product. The filtration rate as a function of operating temperature and pressure were experimentally determined. When the operating temperature was increased, the decreasing polymer viscosity resulted in an increase of filtration rate but was counteracted by the swelling effect of the membrane layer. Similarly, when the pressure was increased, the increase in driving force for filtration was counteracted by a simultaneous increase in particle packing. The filtration behavior of this dynamic membrane system was also simulated by the general blocking model t/VrfV 2 = k(dt/ dV) q , where q was found to have negative values. Negative q values mean that our system reached a maximum blocking rate during the initial period of filtration and then decreased gradually. When the blocking rate became small enough, the system behaved like cake filtration. A satisfactory fit between experimental data and theoretical calculations was demonstrated.

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Dynamic Membranes in Ultrafiltration and Reverse Osmosis

Cited by 57 publications

References 12 publications

Modified dip-coating method for preparation of pinhole-free ceramic membranes

Modified dip-coating method for preparation of pinhole-free ceramic membranes

Electrocoagulation and crossflow microfiltration hybrid system: fouling investigation

Dead-End Flow Filtration of Solid Suspension in Polymer Fluid through an Active Kaolin Dynamic Membrane

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