| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of cleaning soil which has a high removal efficiency of heavy metal from a soil contaminated with heavy metal and realizes an inexpensive treatment of the soil contaminated with the heavy metal by employing a low-cost post-treatment method with a minimum scale treatment as the post-treatment of the soil and treated water after the heavy metal removal. SOLUTION: Water, halogenated substances of calcium, magnesium and strontium and an acid are added to the soil contaminated with the heavy metal to obtain a weakly acidic aqueous solution and the heavy metal is eluted and removed. The halogenated substances of calcium, magnesium and strontium are made to be an aqueous solution thereof having a concentration of 0.5∼1.5mol/l and the quantity of the aqueous solution 5∼10 times in weight ratio for the soil contaminated with the heavy metal is used. The cleaned soil after the heavy metal elution is recyclable after pH adjustment and desalting. The aqueous solution containing eluted heavy metal is disposed of after being rendered harmless by well-known treatment. COPYRIGHT: (C)2004,JPO
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