Abstract
A series experiments for the removal of heavy metals from soils has been carried out by the electro-kinetic remediation, utilizing the electro-osmosis and the ionic migration phenomena under the electric field. The effect of the operational conditions on the removal efficiency was investigated using a bench scale test cell and it is concluded that the pH control of the catholyte was the important factor to improve the removal efficiency. Next, the attempt to remove heavy metals from the sediment of a lake was done and it was found that some heavy metals were successfully removed, but the other were not, because complicated precipitation reactions occurred in the sediment. A simulation model is indispensable to evaluate a remediation technology, because the remediation of contaminated soils requires a long time processing. An advection-dispersion one-dimensional model in the porous medium with chemical reactions such as precipitation and dissolution was proposed. Equations in the model were solved by Excel spread sheet, and the result was compared with experimental data. The precipitation by the model was qualitatively agreed with the behavior of ionic species in the soil
