The Effect of Phosphoric Acid as a Casting Dope Ingredient on Reverse-Osmosis Membrane Properties

1981 ◽  
pp. 235-245 ◽  
Author(s):  
B. KUNST ◽  
Z. VAJNAHT
Keyword(s):  
Phosphoric Acid ◽  
Reverse Osmosis ◽  
Membrane Properties ◽  
Reverse Osmosis Membrane

scholarly journals Recycling of Spent Reverse Osmosis Membranes for Second Use in the Clarification of Wet-Process Phosphoric Acid

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 637
Author(s):  
Khaoula Khaless ◽  
Brahim Achiou ◽  
Rachid Boulif ◽  
Rachid Benhida
Keyword(s):  
Organic Matter ◽  
Phosphoric Acid ◽  
Organic Solvent ◽  
Reverse Osmosis ◽  
Acid Treatment ◽  
Suspended Solid ◽  
Reverse Osmosis Membrane ◽  
Wet Process ◽  
Green Separation ◽  
Second Use

Various techniques have been used to “clean-up” wet-process phosphoric acid such as precipitation, flotation and adsorption. To address the potential of membrane processes in the phosphoric acid clarification process, this study explores the benefits of membrane techniques as a green separation technique for phosphoric acid clarification in an eco-efficient way through the use of recycling spent reverse osmosis membrane. Regenerated membrane was used to study the phosphoric acid clarification at a laboratory scale. They were immersed in an oxidizer for at most seven days. The samples were characterized systematically before immersion in an oxidant media. In this study, the potential to regenerate spent membranes and application of this media to clarify the 29% P2O5 phosphoric acid was demonstrated. This study shows, through experiments, that the reverse osmosis (RO) membranes could achieve a rejection of 70% and 61% for suspended solid and organic matter, respectively. These promising results will pave the way for implementation of these membranes in phosphoric acid treatment. Moreover, besides being economically advantageous, the use of the spent membrane is likely an environmentally friendly route (no waste, no organic solvent and effluent to be regenerated later on).

Impacts of reaction and curing conditions on polyamide composite reverse osmosis membrane properties

2008 ◽  
Vol 311 (1-2) ◽  
pp. 34-45 ◽  
Author(s):  
Asim K. Ghosh ◽  
Byeong-Heon Jeong ◽  
Xiaofei Huang ◽  
Eric M.V. Hoek
Keyword(s):  
Reverse Osmosis ◽  
Membrane Properties ◽  
Reverse Osmosis Membrane ◽  
Curing Conditions

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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