3.2. Aluminum dissolved from the electrodes and metal residuals after
treatment
Measured and predicted aluminum concentrations of the samples
after EC treatment are shown in Fig. 1. The highest aluminum
concentrations per electric charge were measured for Cells A + C
when initial pH was 4 and 5. However, in initial pH 3 the highest
dissolved aluminum concentrations with 96 C/l and 144 C/l were
measured for Cell C. It is possible that at very low pH the chemical
dissolution of aluminum from all electrode plates (Eq. (6)) occurs
simultaneously with Eq. (1).