scholarly journals The Effect of Fluid Velocity on the Diffusion of Trimethylene Glycol through a Reverse Osmosis Membrane in Microchannel -X

2021 ◽  
Vol 21 (1) ◽  
pp. 8-13
Author(s):  
Sugeng Hadi Susilo ◽  
◽  
Zahratul Jannah ◽  
R.N. Akhsanu Takwim ◽  
◽  
...  
Keyword(s):  
Diffusion Process ◽  
Flow Velocity ◽  
Reverse Osmosis ◽  
Fluid Velocity ◽  
Liquid Waste ◽  
Microfluidic System ◽  
Reverse Osmosis Membrane ◽  
Flowing Fluid ◽  
Trimethylene Glycol ◽  
Fluid Concentration

The study aims to observe the diffusion process which is influenced by different velocity and fluid concentrations. Using a microfluidic system and the diffusion process through a reverse osmosis membrane. The research was carried out by flowing fluid into the microchannel. The diffusion process is known by measuring and analyzing the density of liquid waste aquades-trimethylene glycol. The results showed the amount of diffusion through the membrane was influenced by flow velocity and fluid concentration. this is because the velocity of the flow produces pressure on the wall so that it pushes the fluid to diffuse through the membrane.

scholarly journals The concentrating of alizarin using a reverse osmosis process

2005 ◽  
Vol 70 (1) ◽  
pp. 107-114 ◽  
Author(s):  
S.S. Madaeni ◽  
H. Daneshvar
Keyword(s):  
Flow Velocity ◽  
Reverse Osmosis ◽  
Cross Flow ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Transmembrane Pressure ◽  
Reverse Osmosis Membrane ◽  
Cross Flow Velocity ◽  
Membrane Technologies ◽  
Madder Root

Membrane technologies in general and reverse osmosis in particular have been employed for the concentrating of solutions. In this study, the concentrating of a heat sensitive alizarin extracted from madder root was realized using an FT30 reverse osmosis membrane. The effects of cross flow velocity, transmembrane pressure and pH on the flux and rejection were studied. Increasing the transmembrane pressure increased the flux while the rejection was constant. At pH 7-8, the highest flux was achieved. This study showed that reverse osmosis is the process of choice for the concentrating of alizarin solutions. The optimum operating conditions were 1.0 m/s cross flow velocity, 16 bars transmembrane pressure and pH 7. The system was tested for 12 h without severe fouling problems.

Cellulose Acetate Reverse Osmosis Membrane Structure

1972 ◽  
Vol 30 ◽  
pp. 528-529
Author(s):  
H. K. Plummer ◽  
E. Eichen ◽  
C. D. Melvin
Keyword(s):  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Membrane Structure ◽  
Freeze Drying ◽  
Dense Layer ◽  
Water Removal ◽  
Reverse Osmosis Membrane ◽  
Correct Interpretation ◽  
Electron Image ◽  
Scanning Electron

Much of the work reported in the literature on cellulose acetate reverse osmosis membranes has raised new and important questions with regard to the dense or “active” layer of these membranes. Several thickness values and structures have been attributed to the dense layer. To ensure the correct interpretation of the cellulose acetate structure thirteen different preparative techniques have been used in this investigation. These thirteen methods included various combinations of water substitution, freeze drying, freeze sectioning, fracturing, embedding, and microtomy techniques with both transmission and scanning electron microscope observations.It was observed that several factors can cause a distortion of the structure during sample preparation. The most obvious problem of water removal can cause swelling, shrinking, and folds. Improper removal of embedding materials, when used, can cause a loss of electron image contrast and, or structure which could hinder interpretation.

Novel Magnetic Resonance Measurements of Fouling in Operating Spiral Wound Reverse Osmosis Membrane Modules

2021 ◽  
Vol 196 ◽  
pp. 117006 ◽  
Author(s):  
Nicholas W. Bristow ◽  
Sarah J. Vogt ◽  
Szilard S. Bucs ◽  
Johannes S. Vrouwenvelder ◽  
Michael L. Johns ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Reverse Osmosis ◽  
Reverse Osmosis Membrane ◽  
Membrane Modules ◽  
Spiral Wound

scholarly journals Antifouling and Flux Enhancement of Reverse Osmosis Membrane by Grafting Poly (3-Sulfopropyl Methacrylate) Brushes

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 213
Author(s):  
Reema Mushtaq ◽  
Muhammad Asad Abbas ◽  
Shehla Mushtaq ◽  
Nasir M. Ahmad ◽  
Niaz Ali Khan ◽  
...  
Keyword(s):  
Contact Angle ◽  
Reverse Osmosis ◽  
Polymer Brushes ◽  
Surface Composition ◽  
Reverse Osmosis Membrane ◽  
Optical Profilometry ◽  
Thin Film Composite ◽  
Membrane Sample ◽  
Contact Angle Analysis ◽  
And Staphylococcus Aureus

A commercial thin film composite (TFC) polyamide (PA) reverse osmosis membrane was grafted with 3-sulfopropyl methacrylate potassium (SPMK) to produce PA-g-SPMK by atom transfer radical polymerization (ATRP). The grafting of PA was done at varied concentrations of SPMK, and its effect on the surface composition and morphology was studied by Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), optical profilometry, and contact angle analysis. The grafting of hydrophilic ionically charged PSPMK polymer brushes having acrylate and sulfonate groups resulted in enhanced hydrophilicity rendering a reduction of contact angle from 58° of pristine membrane sample labeled as MH0 to 10° for a modified membrane sample labeled as MH3. Due to the increased hydrophilicity, the flux rate rises from 57.1 L m−2 h−1 to 71.2 L m−2 h−1, and 99% resistance against microbial adhesion (Escherichia coli and Staphylococcus aureus) was obtained for MH3 after modification

Evaluating an on-line cleaning agent for mitigating organic fouling in a reverse osmosis membrane

Chemosphere ◽  
2021 ◽  
pp. 130033
Author(s):  
Sanghun Park ◽  
Seok Min Hong ◽  
Jongkwan Park ◽  
Sunam You ◽  
Younggeun Lee ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Reverse Osmosis Membrane ◽  
Cleaning Agent ◽  
Organic Fouling ◽  
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