電気化学的現場処理による汚染土壌修復のモデル化

抄録

In order to investigate the efficiency of the in-situ electrokinetic method for the remediation of the soil contaminated with heavy metals, a mathematical model based on the physico-chemical transport phenomena has been constructed and the remediation process is simulated numerically with use of the model. The elecrokinetic remediation is realized by applying a fixed low voltage direct current between the anode and the cathode which are set into the contaminated zone and saturating the zone with purge water. The numerical simulations show that the electrokinetic method is effective for the remediation of the polluted soil especially with heavy metals. The electric current and the electric potential between the anode and the cathode are the important operational variables for the elecrokinetic remediation. It has been proved that the removal process can be divided into the two stages, i.e., the first stage and the second stage, according to the manner of the time variation of the electric current (i.e., the time variation of the spatial characteristics of the removal). The remediation process progresses from the anode to the cathode.