Effect of salt additives on the optimization of PVDF hollow fiber membrane in DCMD performance
Paper ID : 1368-MST2015-FULL
tohid vazirnejad1, Javad Karimi-Sabet *2, seyed mohammad ali moosavian3, Sohrab ali Ghorbanian4, Abolfazl Dastbaz5
1P.O.BOX: 14395-983, Tehran, Iran.
2NFCRS, Nuclear Science and Technology Research Institute, Tehran, Iran
3University College of Engineering, University of Tehran, Tehran, Iran
4University of Tehran
5Department of Chemical engineering, University of Tehran, Tehran, Iran
Polyvinylidene fluoride (PVDF) hollow fiber membranes were prepared by the dry/wet spinning phase inversion technique. At the first, the suitable salt additive between several non-solvent salts (NaCl, KCl and BaCl2) was determined. Then, the mean outer surface pore size, overall porosity and hydrophobicity of synthesized hollow fiber at different salt concentration, polymer concentration and air gap were optimized. The prepared membranes were characterized by contact angle and liquid entry pressure (LEP) measurement. Afterward, the optimum fiber was tested for desalination by direct contact membrane distillation (DCMD) process. Under operating condition (feed concentration, 0.5 mol/lit; and temperature, 80 °C), the optimum synthesized fiber was compared with a fiber prepared in the same condition without the salt additive. Permeation flux was improved in optimal fiber from 13.7 kg/m2.hr to 20.1 with salt rejection of 99.9%.
PVDF, Salt additive, DCMD, Desalination
Status : Paper Accepted (Poster Presentation)