| 摘要 |
PURPOSE: A purifying method of polluted soil is provided to implement polluted soil purifying processes without a cooling unit and a bag filter unit by replacing a secondary oxidation process with a supercritical water treatment process. CONSTITUTION: A purifying method of polluted soil includes the following steps: soil polluted with oils or non-degradable organic materials is thermally desorbed; thermally desorbed exhaust gas is condensed; the condensed liquid is introduced into a supercritical water reactor(50); the supercritical water reactor is heated to a supercritical water condition; and pollutants contained in the condensed liquid is treated. The thermal desorbing process further includes a process which cools and discharges the purified soil. The thermal desorption process is implemented at a temperature between 200 and 700 deg C for 1 to 70 minutes. [Reference numerals] (10) Polluted soil introducing part; (20) Heat desorption part; (30) Cooling part; (40) Dust condenser; (50) Subcritical water reactor; (AA) Subcritical treated liquid; (BB) Purified soil |
