scholarly journals Biguanidine functional chitooligosaccharide modified reverse osmosis membrane with improved anti-biofouling property

RSC Advances ◽  
2018 ◽  
Vol 8 (73) ◽  
pp. 41938-41949 ◽  
Author(s):  
Huihui Wang ◽  
Yixuan Zhou ◽  
Yao Wang ◽  
Zhi Wang ◽  
Jixiao Wang
Keyword(s):  
Reverse Osmosis ◽  
Interfacial Polymerization ◽  
Antimicrobial Properties ◽  
Reverse Osmosis Membrane ◽  
Ro Membrane

The COSG-modified RO membrane with excellent anti-adhesive and antimicrobial properties was successfully fabricated by second interfacial polymerization.

scholarly journals Performance of chemically resistant polyurea reverse osmosis membrane in the treatment of highly alkaline industrial wastewater containing sodium aluminate

2020 ◽  
Vol 82 (11) ◽  
pp. 2259-2270
Author(s):  
Shaik Nazia ◽  
Sugali Chandra Sekhar ◽  
Veeriah Jegatheesan ◽  
Suresh K. Bhargava ◽  
Sundergopal Sridhar
Keyword(s):  
Reverse Osmosis ◽  
Industrial Wastewater ◽  
Interfacial Polymerization ◽  
Industrial Effluent ◽  
Oxygen Demand ◽  
Sodium Aluminate ◽  
Water Recovery ◽  
Cross Sectional ◽  
Feed Composition ◽  
Ro Membrane

Abstract The goal of the present study is to treat industrial wastewater containing sodium aluminate using a chemically inert polyurea (PU) based thin film composite (TFC) reverse osmosis (RO) membrane to promote water reclamation and zero liquid discharge (ZLD). Pretreatment was carried out to reduce the pH of the effluent from 12.5 to 7.1. The TFC RO membrane was fabricated by coating PU on Polyethersulfone (PES) substrate by interfacial polymerization (IP). The surface and cross-sectional morphologies of the membrane were characterized using scanning electron microscopy (SEM). The indigenously synthesized membrane was effective in the removal of total dissolved solids (TDS), chemical oxygen demand (COD), colour and electrical conductivity. The experiments were conducted by varying the feed composition of the wastewater. The maximum water recovery and flux were found to be 74% and 73.9 L/m2·h. RO process using PU membrane exhibited significant potential for cost effective, safe and pollution-free treatment of sodium aluminate industrial effluent.

Comparative Study on the Treatment of Biologically Treated Textile Effluent by Nanofiltration and Reverse Osmosis for Water Reuse

2012 ◽  
Vol 441 ◽  
pp. 584-588
Author(s):  
San Chuan Yu ◽  
Zhi Wen Chen ◽  
Mei Hong Liu ◽  
Jing Wei Zhao
Keyword(s):  
Reverse Osmosis ◽  
Water Reuse ◽  
Cross Flow ◽  
Water Shortage ◽  
Nanofiltration Membrane ◽  
Reverse Osmosis Membrane ◽  
Permeate Flux ◽  
Flux Decline ◽  
Salinity Reduction ◽  
Ro Membrane

In view of the water shortage, the increasingly severe regulations as well as the release thresholds, it is becoming increasingly necessary to reuse the textile effluents. This work concerned the treatment of textile plant effluent after conventional biological processing by membrane technology for water reuse. Desal5 DK nanofiltration (NF) membrane and BW30 reverse osmosis (RO) membrane were investigated in this study in terms of COD and color removal, salinity reduction as well as permeate flux through cross-flow permeation tests. The results showed that the Desal5 DK nanofiltration membrane exhibited higher stabilized water permeability and flux decline than the reverse osmosis membrane because of its higher porosity and tendency towards fouling. The BW30 reverse osmosis membrane reduced salinity to a great extent than the Desal5 DK nanofiltration membrane. While the nanofiltration membrane exhibited better COD removal efficiency compared to the RO membrane, possibly due to its sieving removal mechanism. The treated water with good enough quality could be recycled back into the process, thereby offering economical benefits by reducing the water consumption and wastewater treatment cost.

Accelerated Seeded Precipitation Pre-Treatment for the Improvement of Reverse Osmosis Membrane

2013 ◽  
Vol 477-478 ◽  
pp. 1365-1368
Author(s):  
Yong Chen ◽  
Xin Long Zhang ◽  
Ji Lai Lu ◽  
Wei Jing Liu ◽  
Yong Tu
Keyword(s):  
Reverse Osmosis ◽  
Reverse Osmosis Membrane ◽  
Seed Type ◽  
Sem Images ◽  
Seeded Precipitation ◽  
Initial Ph ◽  
Ro Membrane ◽  
Pre Treatment

The research on accelerated seeded precipitation pre-treatment for the improvement of secondary RO membrane was investigated. The influences of seed type, initial pH and seed dosage on accelerated seeded precipitation were studied. SEM images for the secondary RO membrane were also discussed.

A novel high-flux, thin-film composite reverse osmosis membrane modified by chitosan for advanced water treatment

RSC Advances ◽  
2015 ◽  
Vol 5 (9) ◽  
pp. 6687-6694 ◽  
Author(s):  
Hiren D. Raval ◽  
Pranav S. Rana ◽  
Subarna Maiti
Keyword(s):  
Thin Film ◽  
Water Treatment ◽  
Reverse Osmosis ◽  
High Flux ◽  
Reverse Osmosis Membrane ◽  
Film Composite ◽  
Thin Film Composite ◽  
Novel Method ◽  
Ro Membrane ◽  
Chitosan Composite

This work demonstrates a novel method for improving the performance of thin-film composite RO membrane by making a polyamide–chitosan composite.

scholarly journals An Autopsy Study of a Fouled Reverse Osmosis Membrane Used for Ultrapure Water Production

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1116 ◽  
Author(s):  
Hojung Rho ◽  
Kangmin Chon ◽  
Jaeweon Cho
Keyword(s):  
Reverse Osmosis ◽  
Reverse Osmosis Membrane ◽  
Ultrapure Water ◽  
Ultraviolet A ◽  
Cleaning Efficiency ◽  
Autopsy Study ◽  
Membrane Surfaces ◽  
Ro Membrane ◽  
Ultra Trace

This study investigated the fouling and cleaning behaviors of reverse osmosis (RO) membranes in a lab–scale ultrapure water (UPW) production system via membrane autopsies and characterization of dissolved organic matter (DOM) and membrane foulants. Most of DOM were effectively removed by the MFC filter, with the exception of the peak at 150 Da. The RO membranes were effective in reducing conductivity, DOM, total nitrogen (TN), and ultraviolet A (UVA254nm) concentration; the polishing stage using IER filter resulted in ultra-trace levels of all these parameters required for semiconductor manufacturing (> 18.2 ΩM). The quantity of the desorbed RO membrane foulants, in terms of dissolved organic carbon (DOC), varied considerably depending on the type of desorbing agents: 0.1 N NaCl (65.12 mgC m−2) > 0.1 N NaOH (46.14 mgC m−2) > deionized water (25.39 mgC m−2) > 0.1 N HCl (15.95 mgC m−2). The high cleaning efficiency of the salt solution (0.1 N NaCl) was attributed to the efficient desorption of hydrophilic DOM foulants from the RO membrane surfaces. These results demonstrate that the salt cleaning may provide a promising option to recover the performance of the RO membranes fouled primarily by hydrophilic DOM fractions.

scholarly journals A novel semi-aromatic polyamide TFC reverse osmosis membrane fabricated from a dendritic molecule of trimesoylamidoamine through a two-step amine-immersion mode

RSC Advances ◽  
2017 ◽  
Vol 7 (62) ◽  
pp. 39127-39137 ◽  
Author(s):  
Hao Wu ◽  
Xiao-Lin Chen ◽  
Xiang Huang ◽  
Hui-Min Ruan ◽  
Yan-Li Ji ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Aromatic Polyamide ◽  
Reverse Osmosis Membrane ◽  
Immersion Method ◽  
Ro Membrane ◽  
Trimesoyl Chloride

In this work, a novel semi-aromatic polyamide RO membrane was fabricated from a new dendritic molecule of trimesoylamidoamine (TMAAM) combined 1,3-diamino-2-propanol (DAP) to react with trimesoyl chloride (TMC) via a new two-step amine immersion method.

Enhancement in membrane performances of a commercial polyamide reverse osmosis membrane via surface coating of polydopamine followed by the grafting of polyethylenimine

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 98566-98575 ◽  
Author(s):  
Hao Li ◽  
Lei Peng ◽  
Yunbai Luo ◽  
Ping Yu
Keyword(s):  
Reverse Osmosis ◽  
Surface Coating ◽  
Antibacterial Properties ◽  
Aromatic Polyamide ◽  
Reverse Osmosis Membrane ◽  
Ro Membrane

A commercial aromatic polyamide RO membrane was modified via surface coating of polydopamine followed by the grafting of polyethylenimine. The modification enhanced the chlorine resistance, anti-fouling and antibacterial properties of the membrane.

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