| Summary: | The techniques of fixed and approaching anodes have been utilized in this study using polygonal electrodes arranged in the form as one cathode and four anodes. Disodium ethylenediaminetetraacetic acid (EDTA-Na2) and Distilled Water (DW) was used as purging solutions in the treatment of lead contaminated soil with a concentration of (750 mg / kg). In all experiments was applied a 1.5 V/cm as a constant DC voltage gradient. Results showed that the pH value decreases especially in the approaching anode technique. The average lead removal efficiency at both line of sampling points A and B in EK-3 (fixed anode technique) was 64 and 67%, respectively, and in EK-4 (approaching anode technique) was 68.1 and 71%, respectively, when was used 0.2 M EDTA as purging solution. And that reduction rate was lower when Distilled Water is used.
|
|---|