Patent ID: 9127432
Filing Date: 2015-09-08
Classification: B09C,C02F,E02D

Abstract:
1. An electrokinetic decontamination equipment for removing a radionuclide from contaminated soil, the apparatus comprising: an electrolyte supply unit to supply electrolyte; an electrokinetic unit comprising an inlet disposed at a first side and connected with the electrolyte supply unit for supplying the electrolyte from the electrolyte supply unit to the electrokinetic unit, a receiving portion disposed inside the electrokinetic unit to receive the contaminated soil, and an outlet disposed at a second side to discharge from the electrokinetic unit waste electrolyte passed through the contaminated soil; an electrode unit operably provided to the electrokinetic unit to supply an anode power and a cathode power to different portions of the contaminated soil received in the receiving portion; a pH control unit operably provided to the electrokinetic unit to supply a pH control solution to each different portion supplied with the anode power and the cathode power so as to control pH values of the different portions; a waste solution storage unit connected to the outlet of the electrokinetic unit to store the waste electrolyte discharged through the outlet; a soil washing unit connected to the waste solution storage unit adapted to reduce by 70-80% a content of the radionuclide in the contaminated soil supplied to the electrokinetic unit, the soil washing unit adapted to use the waste electrolyte supplied from the waste solution storage unit; a settling separation unit connected to the soil washing unit to separate waste wash solution discharged from the soil washing unit into precipitate and supernatant; and a waste solution processing unit connected to the settling separation unit to process the precipitate separated by the settling separation unit, wherein 70-80% of the radionuclide is removed from the contaminated soil by the waste electrolyte in the washing unit and wherein the electrode unit and the electrolyte in the electrokinetic unit are adapted to remove about 95% or more of the radionuclide remaining in the contaminated soil from the washing unit, and wherein the receiving portion further comprises a packing member configured to allow passage of the electrolyte and to prevent passage of the soil, wherein the apparatus further comprises a centrifuge between the soil washing unit and the electrokinetic unit adapted to separate the soil washed by the soil washing unit.