tailieunhanh - Waste Water Treatment and Reutilization 2011 Part 12

Tham khảo tài liệu 'waste water treatment and reutilization 2011 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 286 Waste Water - Treatment and Reutilization by adding KOH solution to CuSO4 solution at room temperature with constant stirring. The light blue precipitate obtained was washed several times with distilled water and mixed with alumina quickly in order to avoid hydroxide decomposition. Figure 6 shows that the concentration of aluminum released in to solution outside of the bag Fig. 6. Aluminum ion released in the solution outside the bag during Cu OH 2 interaction with alumina. solution was ppm at the end of the experiment. The total amount of alumina dissolved after 74 h of experiment was calculated to be mg from the aluminum content of the solution. This amount of alumina dissolved is significantly higher than when alumina was impregnated with CuSO4 at pH 9 for 240 h. The presence of copper was not detected in the solution outside of the bag. The color of Cu OH 2 inside of the bag did not change even after 74 h of experiment. Therefore it can be said that Cu OH 2 did not decompose at pH 9 50 C when it was mixed in a slurry with an appropriate amount of alumina. On the basis of the above observations additional experiments were performed to determine the adsorption capacity of Y-Al2O3 for Cu OH 2. A g sample of alumina was added to the fresh Cu OH 2 precipitate g under stirring and the pH was adjusted to 9 at temperature of 50 C. It was observed that the amount of alumina g was too small to stabilize the Cu OH 2 completely because some of the Cu OH 2 had decomposed into CuO and the color of the slurry had turned black. The amount of added alumina was increased gradually in g increments. Ultimately it was found that g of the alumina was necessary to completely stabilize g of Cu OH 2. The alumina adsorption capacity for copper was calculated to be 10-5 mol Cu m-2. This value is almost completely in agreement with the value reported by Dumas et al. 1989 10-6 mol Cu m-2 in a basic medium and 10-5 mol Cm m-2 in an .

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