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 Antifouling Property of Oppositely Charged Titania Nanosheet Assembled on Thin Film Composite Reverse Osmosis Membrane for Highly Concentrated Oily Saline Water Treatment

Membranes ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 237
Author(s):  
Nor Akalili Ahmad ◽  
Pei Sean Goh ◽  
Abdul Karim Zulhairun ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Thin Film ◽  
Wastewater Treatment ◽  
Reverse Osmosis ◽  
Saline Water ◽  
High Concentration ◽  
Saline Wastewater ◽  
Film Composite ◽  
Thin Film Composite ◽  
Tfc Membrane ◽  
Ro Membrane

With the blooming of oil and gas industries, oily saline wastewater treatment becomes a viable option to resolve the oily water disposal issue and to provide a source of water for beneficial use. Reverse osmosis (RO) has been touted as a promising technology for oily saline wastewater treatment. However, one great challenge of RO membrane is fouling phenomena, which is caused by the presence of hydrocarbon contents in the oily saline wastewater. This study focuses on the fabrication of antifouling RO membrane for accomplishing simultaneous separation of salt and oil. Thin film nanocomposite (TFN) RO membrane was formed by the layer by layer (LbL) assembly of positively charged TNS (pTNS) and negatively charged TNS (nTNS) on the surface of thin film composite (TFC) membrane. The unique features, rendered by hydrophilic TNS bilayer assembled on TFC membrane in the formation of a hydration layer to enhance the fouling resistance by high concentration oily saline water while maintaining the salt rejection, were discussed in this study. The characterization findings revealed that the surface properties of membrane were improved in terms of surface hydrophilicity, surface roughness, and polyamide(PA) cross-linking. The TFC RO membrane coated with 2-bilayer of TNS achieved >99% and >98% for oil and salt rejection, respectively. During the long-term study, the 2TNS-PA TFN membrane outperformed the pristine TFC membrane by exhibiting high permeability and much lower fouling propensity for low to high concentration of oily saline water concentration (1000 ppm, 5000 ppm and 10,000 ppm) over a 960 min operation. Meanwhile, the average permeability of uncoated TFC membrane could only be recovered by 95.7%, 89.1% and 82.9% for 1000 ppm, 5000 ppm and 10,000 ppm of the oily saline feedwater, respectively. The 2TNS-PA TFN membrane achieved almost 100% flux recovery for three cycles by hydraulic washing.

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