Fig. 2

Effect of electrode material and applied voltage on the recovery rate during the electroflocculation process. Flocculation experiments were conducted using different electrode materials: magnesium (a), aluminum (b), zinc (c), copper (d), iron (e) and brass (f). The graphs were arranged according to the calculated electrode efficiency from high (a) to low (f). The voltage was adjusted to 10, 20, 30 or 40 V and the flocculation efficiency was measured every 90 s.