Composite membranes for water purification by low pressure reverse osmosis and for dehydration of aqueous ethanol by pervaporation

1993 ◽  
Vol 70-71 (1) ◽  
pp. 341-349 ◽  
Author(s):  
Haruhiko Ohya ◽  
Ho Sang Choi ◽  
Takeshi Hino ◽  
Tatsuya Hara ◽  
Futoshi Ohsawa ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Water Purification ◽  
Aqueous Ethanol ◽  
Composite Membranes ◽  
Low Pressure

scholarly journals In Situ Modification of Reverse Osmosis Membrane Elements for Enhanced Removal of Multiple Micropollutants

Membranes ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 28 ◽  
Author(s):  
Katie Baransi-Karkaby ◽  
Maria Bass ◽  
Viatcheslav Freger
Keyword(s):  
Boric Acid ◽  
Reverse Osmosis ◽  
Composite Membranes ◽  
Low Pressure ◽  
Pharmaceutically Active Compounds ◽  
Surface Polymerization ◽  
In Situ Modification ◽  
Endocrine Disrupting ◽  
Enhanced Surface

Reverse osmosis (RO) membranes are widely used for desalination and water treatment. However, they insufficiently reject some small uncharged micropollutants, such as certain endocrine-disrupting, pharmaceutically active compounds and boric acid, increasingly present in water sources and wastewater. This study examines the feasibility of improving rejection of multiple micropollutants in commercial low-pressure RO membrane elements using concentration polarization- and surfactant-enhanced surface polymerization. Low-pressure membrane elements modified by grafting poly(glycidyl methacrylate) showed enhanced rejection of all tested solutes (model organic micropollutants, boric acid, and NaCl), with permeability somewhat reduced, but comparable with commercial brackish water RO membranes. The study demonstrates the potential and up-scalability of grafting as an in situ method for improving removal of various classes of organic and inorganic micropollutants and tuning performance in RO and other dense composite membranes for water purification.

Water purification of nitrates by low-pressure reverse osmosis method

2013 ◽  
Vol 35 (2) ◽  
pp. 71-75 ◽  
Author(s):  
V. V. Goncharuk ◽  
V. O. Osipenko ◽  
M. N. Balakina ◽  
D. D. Kucheruk
Keyword(s):  
Reverse Osmosis ◽  
Water Purification ◽  
Low Pressure

scholarly journals 2D nanosheet enabled thin film nanocomposite membranes for freshwater production – a review

2021 ◽  
Author(s):  
Deepak Surendhra Mallya ◽  
Ludovic Dumee ◽  
Shoba Muthukumaran ◽  
Weiwei Lei ◽  
Bas Baskaran
Keyword(s):  
Thin Film ◽  
Reverse Osmosis ◽  
Water Purification ◽  
Composite Membranes ◽  
Nanocomposite Membranes ◽  
Film Composite ◽  
Thin Film Composite ◽  
2D Nanosheets ◽  
Thin Film Nanocomposite

Thin film composite membranes (TFC) are primarily used for commercial desalination and water purification applications by both reverse osmosis (RO) and nanofiltration (NF). The incorporation of 2D nanosheets across TFC...

Fouling Is the Beginning: Upcycling Biopolymer-Fouled Substrates for Fabricating High-Permeance Thin-Film Composite Polyamide Membranes

2020 ◽  
Author(s):  
Ruobin Dai ◽  
Hongyi Han ◽  
Tianlin Wang ◽  
Jiayi Li ◽  
Chuyang Y. Tang ◽  
...  
Keyword(s):  
Thin Film ◽  
High Pressure ◽  
End Of Life ◽  
Water Purification ◽  
Low Pressure ◽  
Polymeric Membranes ◽  
Membrane Recycling ◽  
Film Composite ◽  
Thin Film Composite ◽  
First Time

Commercial polymeric membranes are generally recognized to have low sustainability as membranes need to be replaced and abandoned after reaching the end of their life. At present, only techniques for downcycling end-of-life high-pressure membranes are available. For the first time, this study paves the way for upcycling fouled/end-of-life low-pressure membranes to fabricate new high-pressure membranes for water purification, forming a closed eco-loop of membrane recycling with significantly improved sustainability.

Analysis and calculation of the process of low-pressure reverse osmosis during recycling of hygienic water

2019 ◽  
pp. 28-36
Author(s):  
Leonid S. Bobe ◽  
Nikolay A. Salnikov
Keyword(s):  
Mass Transfer ◽  
Reverse Osmosis ◽  
Life Support ◽  
Space Station ◽  
Low Pressure ◽  
Operating Pressure ◽  
Life Support System ◽  
Cleaning Agent ◽  
The Difference ◽  
Pressure Channel

Analysis and calculation have been conducted of the process of low-pressure reverse osmosis in the membrane apparatus of the system for recycling hygiene water for the space station. The paper describes the physics of the reverse osmosis treatment and determines the motive force of the process, which is the difference of effective pressures (operating pressure minus osmotic pressure) in the solution near the surface of the membrane and in the purified water. It is demonstrated that the membrane scrubbing action is accompanied by diffusion outflow of the cleaning agent components away from the membrane. The mass transfer coefficient and the difference of concentrations (and, accordingly, the difference of osmotic pressures) in the boundary layer of the pressure channel can be determined using an extended analogy between mass transfer and heat transfer. A procedure has been proposed and proven in an experiment for calculating the throughput of a reverse osmosis apparatus purifying the hygiene water obtained through the use of a cleaning agent used in sanitation and housekeeping procedures on Earth. Key words: life support system, hygiene water, water processing, low-pressure reverse osmosis, space station.

Low pressure high flux thin film nanofibrous composite membranes prepared by electrospraying technique combined with solution treatment

2012 ◽  
Vol 394-395 ◽  
pp. 241-247 ◽  
Author(s):  
Hao You ◽  
Yin Yang ◽  
Xiong Li ◽  
Kai Zhang ◽  
Xuefen Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Solution Treatment ◽  
Composite Membranes ◽  
Low Pressure ◽  
High Flux
Sign in / Sign up

Export Citation Format

Share Document