Figure 8

Photos of wastewater (B) after treatment with DND, CuCl2 and potassium ferrocyanide under various conditions. The time in parenthesis is elapse time after the reagents were added. Numbers of the solutions correspond to those in Table 5.

Photos of wastewater (B) after treatment with DND, CuCl2 and potassium ferrocyanide under various conditions. The time in parenthesis is elapse time after the reagents were added. Numbers of the solutions correspond to those in Table 5.