Study Of Filtration Media Prepared By Waste Ceramic And Its Surface Modification

There are a large amounts of solid wastes produced in ceramic industry. If these wastes stack for a long time, not only massive lands will be occupied and environment will be polluted, but also land resources and secondary resources will be wasted. Therefore, the comprehensive utilization of waste ceramic is very significant.In this study, filtration media was made of waste tiles. And its surface was modified with the modifying agent of FeCl3 by heating vaporization. The physicochemical properties were detected such as specific surface area, surface electricity, XRD and SEM. It shows that the specific surface area after modified is eight times larger than that of original, and the modified filtration media surface bears positive charge. The oxidized iron films on the surface of modified filtration media is composed withα-Fe2O3 andβ-FeOOH, mainly inβ-FeOOH. These spherical particles iron oxide are relatively uniform, and adhered firmly.The treatment effect of modified filtration media for Cr(VI) and phosphorus-containing wastewater was studied based on static adsorption and dynamic filtration tests. Static adsorption tests indicated that when the ratio of the dosage(mg) and solution volume(ml), adsorption time and pH value was 2:100, 24h and 3 respectively, the removal rate of Cr(VI) reached 99%.When the ratio of the dosage(mg) and solution volume(ml), adsorption time and pH value was 1:100, 12h and 6 respectively, the removal rate of phosphorus was above 98%. Futhermore, it was also found that ionic strength had a great influence on Cr(VI) and phosphorus removal rate. Dynamic filtration tests was carried out with a filtration layer height of 400mm and filtration velocity of 8m/h. The results indicated that when the raw water concentration was 50mg/L, the removal rate of Cr(VI) still closed to 100% after 12 hours continuous filtrating. When the raw water concentration was 30mg/L, the removal rate of the phosphorus was over 90% after 6 hours continuous filtrating.The desorption tests showed that the regeneration of the used filtration media was excellent at alkaline condition.