Fouling Resistance of PVDF-Fabric Composite Membrane in Membrane Distillation Desalination

2010 ◽  
Vol 150-151 ◽  
pp. 334-339 ◽  
Author(s):  
Rui Ting Huo ◽  
Zhen Ya Gu ◽  
Kai Jie Zuo ◽  
Guang Ming Zhao
Keyword(s):  
Composite Membrane ◽  
Saline Water ◽  
Membrane Distillation ◽  
Fouling Resistance ◽  
Pvdf Membrane ◽  
Membrane Layer ◽  
Air Gap Membrane Distillation ◽  
Fabric Composite ◽  
Fabric Layer ◽  
Fabric Surface

The strength and the fouling resistance of PVDF membrane prepared by wet phase inversion process can be improved by an innovation in membrane preparation. The prepared flat-sheet PVDF-fabric composite membrane consists of a fabric layer and a PVDF membrane layer. The fouling resistance of the composite membrane in membrane distillation (MD) desalination was investigated by air gap membrane distillation (AGMD), using simulated saline water and high concentration NaCl solution as the feed solutions respectively. The experimental results showed that the water-and-oil repellent finishing of the fabric support had a significant effect on the bonding strength and the fouling resistance of the composite membrane. With the protection of the fabric layer for the PVDF membrane layer, the composite membrane exhibited better fouling resistance as its fabric surface was in contact with the feed solution in MD process, when the fabric support was finished with 2g/L FK-501.

Preparation and properties of PVDF-fabric composite membrane for membrane distillation

Desalination ◽  
2009 ◽  
Vol 249 (3) ◽  
pp. 910-913 ◽  
Author(s):  
Ruiting Huo ◽  
Zhenya Gu ◽  
Kaijie Zuo ◽  
Guangming Zhao
Keyword(s):  
Composite Membrane ◽  
Membrane Distillation ◽  
Fabric Composite

Desalination of Water by using Superhydrophobic Fabric

2015 ◽  
Vol 19 (3) ◽  
pp. 1-8
Author(s):  
Hongxia Wang ◽  
Hua Zhou ◽  
Haitao Niu ◽  
Chen Huang ◽  
Amir Abbas ◽  
...  
Keyword(s):  
Contact Angle ◽  
Saline Water ◽  
Salt Content ◽  
Membrane Distillation ◽  
Water Desalination ◽  
Alkaline Condition ◽  
Vapor Permeability ◽  
Permeate Flux ◽  
Sliding Angle ◽  
Air Gap Membrane Distillation

In this study, superhydrophobic fabric is prepared with a wet-chemical coating technique that uses a coating solution synthesized by the co-hydrolysis and co-condensation of tetraethyl orthosilicate and fluoroalkyl silane (tridecafluorooctyl triethoxysilane) under an alkaline condition. The treated fabric shows stable superhydrophobicity with a water contact angle as high as 171°, and a sliding angle as low as 2°. The coated fabric has higher repellency to saline water, and its repellency increases with increases in the salt content in the solution. The contact angle is reduced with increases in liquid temperature. When the water temperature is 90°C, the contact angle on the superhydrophobic fabric is 153°. The superhydrophobic treatment slightly reduces the air permeability, but increases the water vapor permeability of the fabric. The treatment considerably increases the liquid breakthrough pressure, but has little effect on fabric pore size and thermal conductivity. The air gap membrane distillation process is used to evaluate the desalination performance of the superhydrophobic fabric. When the feed and the condenser are kept at 90°C and 20°C, respectively, the membrane distillation (MD) system with the superhydrophobic fabric yields a permeate flux of water up to 13.8 kg m-2 hour-1, which is slightly higher than that with the use of polymer and inorganic MD membranes reported. Superhydrophobic fabrics may thus be considered as effective MD membranes for water desalination applications.

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