Résumé
New ultrafiltration membrane from phosphates industry sub-products material was prepared. The choice of this material is mostly due to its abundance in the Tunisian ores. However, it is considered as harmful subproduct for environment. Plastic paste was prepared using 250 mu m calibrated powder of mud of hydrocyclone laundries phosphates mixed with organic additives and water and then was shaped into a tube by extrusion molding. After drying and sintering at 900 degrees C, the obtained support exhibits an average pore diameter and porosity of about 1.07 mu m and 39%, respectively. It shows also a very interesting properties in terms of mechanical and corrosion resistances.
The coated layer resulting in the ultrafiltration (UP) membrane was performed by a slip-casting method using a suspension made of a mixture of the mud powder, water and polyvinyl alcohol solution (PVA), then heated at 650 degrees C. The UP membrane average pore diameter measured by nitrogen adsorption/desorption method was of 11 nm. The determination of the membrane water permeability shows a value of 90 l/h m(2) bar which is suitable for membrane operating in UP domain.
The application for the treatment of industrial textile wastewater shows an important decrease in turbidity (inferior to 1 NTU), chemical oxygen demand (COD) (retention rate of about 90%) and almost a total color removal. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.