scholarly journals Binding, Unbinding and Aggregation of Crescent-Shaped Particles on Tubular Membranes

2021 ◽  
Vol 120 (3) ◽  
pp. 145a
Author(s):  
Alexander D. Olinger ◽  
Eric J. Spangler ◽  
P.B. Sunil Kumar ◽  
Mohamed Laradji
Keyword(s):  
Tubular Membranes

Membrane thickening of water works sludge

2001 ◽  
Vol 1 (5-6) ◽  
pp. 215-220
Author(s):  
A. Gillighan ◽  
S.J. Judd ◽  
R. Eyres
Keyword(s):  
Hydraulic Resistance ◽  
Reasonable Agreement ◽  
Chemical Cleaning ◽  
Solids Concentration ◽  
Significant Difference ◽  
Layer Resistance ◽  
Tubular Membranes ◽  
Resistance Data ◽  
Mechanical Cleaning ◽  
Dynamic Layer

The efficacy of ultrafiltration (UF) and microfiltration (MF) membranes was assessed for the concentration of actual waterworks sludges using crossflow tubular membranes operated at constant trans-membrane pressure. The MF membrane gave higher initial fluxes than the UF membrane but after 10 min of filtration the flux value and its decline tended to be very similar for both membranes operating under the same conditions. All membranes gave permeate product water of <0.2 NTU and <100ppb coagulant at all times. For both membranes mechanical cleaning, with sponge balls, was at least as effective as acid chemical cleaning, indicating that no significant permanent internal fouling occurred for these membrane materials. Hydraulic resistance data indicated a significant difference in the dynamic layer resistance between the two membranes. Whilst the UF membrane had a hydraulic resistance 3.7 times that of the MF membrane, the dynamic layer formed on the UF membrane during operation displayed a maximum hydraulic resistance almost nine times lower than that of the MF membrane operating under the same conditions. Correlation of cake resistance R versus feed solids concentration C for all the data generated for t>0 demonstrated reasonable agreement with the expression R∝ca where a=0.37 in the current study. This trend has been recorded in previous reported studies, a varying between 0.33 and 0.62 depending on sludge dewaterability.

Effect of Fluidized Bed on Permeate Flux in Ceramic Membrane Cross-Flow Microfiltration

1995 ◽  
Vol 60 (12) ◽  
pp. 2074-2084
Author(s):  
Petr Mikulášek
Keyword(s):  
Fluidized Bed ◽  
Ceramic Membrane ◽  
Cross Flow ◽  
Experimental System ◽  
Experimental Results ◽  
Spherical Particles ◽  
Permeate Flux ◽  
Model Fluid ◽  
Optimum Porosity ◽  
Tubular Membranes

The microfiltration of a model fluid on an α-alumina microfiltration tubular membrane in the presence of a fluidized bed has been examined. Following the description of the basic characteristic of alumina tubular membranes, model dispersion and spherical particles used, some comments on the experimental system and experimental results for different microfiltration systems are presented. From the analysis of experimental results it may be concluded that the use of turbulence-promoting agents resulted in a significant increase of permeate flux through the membrane. It was found out that the optimum porosity of fluidized bed for which the maximum values of permeate flux were reached is approximately 0.8.

Binding, unbinding and aggregation of crescent-shaped nanoparticles on nanoscale tubular membranes

Soft Matter ◽  
2021 ◽  
Author(s):  
Eric J. Spangler ◽  
Alexander D. Olinger ◽  
P. B. Sunil Kumar ◽  
Mohamed Laradji
Keyword(s):  
Phase Diagram ◽  
Adhesion Strength ◽  
Radius Of Curvature ◽  
Tubular Membrane ◽  
Shaped Nanoparticles ◽  
Tubular Membranes

Binding/unbinding phase diagram of a crescent-shaped nanoparticle on a tubular membrane as a function of the tubular membrane radius of curvature and adhesion strength.

Lumenal targeted GFP, used as a marker of soluble cargo, visualises rapid ERGIC to Golgi traffic by a tubulo-vesicular network

2000 ◽  
Vol 113 (18) ◽  
pp. 3151-3159 ◽  
Author(s):  
R. Blum ◽  
D.J. Stephens ◽  
I. Schulz
Keyword(s):  
Fluorescent Protein ◽  
Time Lapse ◽  
Temperature Sensitive ◽  
Long Distance ◽  
Anterograde Transport ◽  
Network Transport ◽  
Vesicular Stomatitis ◽  
Green Fluorescent ◽  
Time Lapse Imaging ◽  
Tubular Membranes

The mechanism by which soluble proteins without sorting motifs are transported to the cell surface is not clear. Here we show that soluble green fluorescent protein (GFP) targeted to the lumen of the endoplasmic reticulum but lacking any known retrieval, retention or targeting motifs, was accumulated in the lumen of the ERGIC if cells were kept at reduced temperature. Upon activation of anterograde transport by rewarming of cells, lumenal GFP stained a microtubule-dependent, pre-Golgi tubulo-vesicular network that served as transport structure between peripheral ERGIC-elements and the perinuclear Golgi complex. Individual examples of these tubular elements up to 20 microm in length were observed. Time lapse imaging indicated rapid anterograde flow of soluble lumenal GFP through this network. Transport tubules, stained by lumenal GFP, segregated rapidly from COPI-positive membranes after transport activation. A transmembrane cargo marker, the temperature sensitive glycoprotein of the vesicular stomatitis virus, ts-045 G, is also not present in tubules which contained the soluble cargo marker lum-GFP. These results suggest a role for pre-Golgi vesicular tubular membranes in long distance anterograde transport of soluble cargo. http://www.biologists.com/JCS/movies/jcs1334.html

Hydrodynamic analysis of upward slug flow in tubular membranes

Desalination ◽  
2002 ◽  
Vol 145 (1-3) ◽  
pp. 179-182 ◽  
Author(s):  
T. Taha ◽  
Z.F. Cui
Keyword(s):  
Slug Flow ◽  
Hydrodynamic Analysis ◽  
Tubular Membranes

scholarly journals Optimal Water Backwashing Condition in Combined Water Treatment of Alumina Microfiltration and PP Beads

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 92
Author(s):  
Hyungmin Cho ◽  
Gihoon Yoon ◽  
Minjae Kim ◽  
Jin Yong Park
Keyword(s):  
Water Treatment ◽  
Membrane Fouling ◽  
Treatment Process ◽  
Membrane Separation ◽  
Combined Process ◽  
Water Treatment Process ◽  
A Minor ◽  
Membrane Shape ◽  
Tubular Membranes ◽  
Total Membrane

Membrane fouling is a dominant limit of the membrane separation process. In this research, the optimal water backwashing to solve the membrane fouling problem was investigated in the combined water treatment process of alumina MF and pure polypropylene (PP) beads. Additionally, the influence of membrane shape (tubular or seven channel) was examined, depending on the water backwashing period. The optimal backwashing time (BT) could be 20 s in the combined water treatment process, because of the highest total treated volume (VT) in our BT 6–30 s conditions. The optimal backwashing period (BP) could be 6 min, because of the minimum membrane fouling and the maximum VT in the combined process of tubular alumina MF and PP beads. The resistance of reversible membrane fouling (Rrf) showed a major resistance of total membrane fouling, and that of irreversible membrane fouling (Rif) was a minor one, in the combined process using tubular or seven channel MF. The Rif showed a decreasing trend obviously, as decreasing BT from NBW to 2 min for seven channel MF. It means that the more frequent water backwashing could be more effective to control the membrane fouling, especially irreversible fouling, for seven channel membranes than tubular membranes.

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