Evaluating the impact of pretreatment processes on fouling of reverse osmosis membrane by secondary wastewater

2021 ◽  
Vol 623 ◽  
pp. 119054
Author(s):  
Y-H. Cai ◽  
N. Galili ◽  
Y. Gelman ◽  
M. Herzberg ◽  
J. Gilron
Keyword(s):  
Reverse Osmosis ◽  
Reverse Osmosis Membrane ◽  
The Impact ◽  
Pretreatment Processes

scholarly journals Effect of Operating Conditions on Removal Heavy and Radioactive Elements by Reverse Osmosis Membrane

2020 ◽  
Vol 13 (3) ◽  
pp. 240-245 ◽  
Author(s):  
Waleed Turki Rashid ◽  
Israa Aziz Alkadira ◽  
Moayyed Gased Jalhoom
Keyword(s):  
Aqueous Solution ◽  
Steady State ◽  
Reverse Osmosis ◽  
Operating Conditions ◽  
Reverse Osmosis Membrane ◽  
Radioactive Elements ◽  
Major Goal ◽  
Ro Membrane ◽  
Temperature And Pressure ◽  
The Impact

The major goal of the presented study has been studying the reverse osmosis (RO) characteristics for (Ni, Fe, Pb, Ca, Cu, K, U, and Th) removal from aqueous solution. This was done by examining the impact related to temperature and pressure on the performance regarding the RO membrane in the removal of elements with time. Three temperatures (25,35 and 45 oC) and various pressures such as (2,4 and 6) bars were used in this work. It was found that, as the pressure increase, the flux permitted and rejection of elements are increased. The temperature increases the flux permitted while the rejection of elements was steady-state almost with the increase in temperature for all heavy and radioactive elements. It also shows that these a steady-state has stopped after 35 ºC and rejection start to decrease.

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 ◽  
On Line
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