TREATMENT METHOD AND ITS APPARATUS OF CONTAMINATED SOIL

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PROBLEM TO BE SOLVED : To provide a treatment method and its apparatus treating soil contaminated with organic substances in situ by washing earth particles of the contaminated soil. SOLUTION : A plurality of metallic hollow pipes 1 with a lot of water permeating holes 3 serving also as positive and negative electrodes is set into contaminated soil G deeper than the depth of the contaminated soil to form pipe rows A for positive electrode and pipe rows B for negative electrodes, each of them facing each other. Vibration generating devices 2 are set, washing water is appropriately sprayed over the upper surface of the contaminated soil G and sufficient amount of washing water is permeated into the contaminated soil G by the vibration of the vibration generating devices 2. Then direct current is applied to the respective electrodes to apply direct current voltage causing electroendosmosis in the contaminated soil between both electrodes. The washing water is made to flow while increasing the flow speed from the positive electrode direction to negative electrode direction by the vibration of the vibration generating devices 2, contaminated pore water among the earth particles or water with contaminant dissolved therein is carried together with the washing water to wash the contaminated soil G. COPYRIGHT : (C)2008, JPO&INPIT