The experimental setup is shown in Fig. 1. The thermostated electrocoagulator was made
of Plexiglas with the dimensions 65mm × 65mm × 110mm at constant stirring speed
(200 rpm). There are four monopolar electrodes, two anodes and two cathodes of the same
dimensions. Both aluminum (99.53%) or iron (99.50%) cathodes and anodes were made
from plates with dimensions of 46mm ×55mm ×3 mm. The total effective electrode area
was 78 cm2 and the spacing between electrodes was 11 mm. The electrodes were connected
to a digital dc power supply (Topward 6306D; 30V, 6A) with potentiostatic or galvanostatic
operational options.