Abstract:Ex-situ electroremediation tests were conducted on the lead-contaminated red soils to find out the optimum condition for the most efficient removal of lead pollution from the red soil, and to examine the relation of the pH of the soil with the electroremediation efficiency. The results show that the electroremediation technology is efficient to remedy Pb contaminated red soils, and the removal efficiency can be enhanced by controlling pH value in the cathode reservoir with HNO₃. The average removal efficiency of Pb is enhanced from 24.5% to 79.5%, and the energy consumption reaches 285kW·h per m³ red soil.

Key words: electroremediation; red soil; lead pollution