قادر حسین زاده

In this study, WO3 microspheres, with special morphology and structure of porous hollow spheres constructed from WO3 nanoparticles, were composited with thin PVA layer of PC/PVA thin film nanocomposite membrane by dip-coating technique, and was used for treatment of the oil refinery wastewater. The obtained results indicates that, the best separation performance was observed for the thin film nanocomposite membrane, containing 0.05 wt% of WO3 nanoparticles. The flux recovery ratio of this sample is 88.64% which is 66.8% higher than that of the PVC membrane. And this sample with rejection percentage of 80.39%, shows an about 27.8% rejection improvement, compared to the bare PVC membrane. Total fouling ratio of this nanocomposite membrane is 34.09% which is about 69.6% lower than that of the PVC membrane. The neat PVC membrane has the high porosity and large pore size, however, this membrane has the low hydrophilicity, and high adsorption of organic pollutants, and this sample has high fouling capability, and consequently has low permeation performance for treatment of the oil refinery wastewater. On the other hand, the thin film nanocomposite membranes containing WO3 nanostructures, have an extra dense nanocomposite PVA thin layer on their surface, and despite of the low porosity and small pore size of these membranes, they have high permeation performance, and increased of hydrophilicity. The improved hydrophilicity, increases the rejection of organic pollutants from the membrane surface and consequently decreases the membrane fouling.