To provide a cleaning method of soil contaminated with oil capable of economically cleaning with a shortened cleaning time and efficiently corresponding to the cleaning quantity regardless of its magnitude at low cost.
The cleaning method of the soil contaminated with oil which contains heavy metal comprises a process S2 of feeding the contaminated soil to a cleaning tank, a process S3 of feeding water to the cleaning tank, a process S4 of feeding an alkali solution to the cleaning tank, a process S5 of feeding a hydrogen peroxide solution to the cleaning tank, a process S6 of stirring the cleaning tank filled with the contaminated soil, water, the alkali solution and the hydrogen peroxide solution and a process S8 of excluding an air bubble layer formed by allowing the fine air bubbles produced by chemical reaction of the alkali solution and the hydrogen peroxide solution fed to the cleaning tank to float to the upper layer part of the cleaning tank. As a result, the oil content and heavy metal included in the air bubble layer are removed and the soil contaminated with oil which contains the oil content and heavy metal is cleaned.
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KAWABATA JUNICHI
KAWAI TATSUJI
IWAMOTO AKITOSHI
Toshikuni Takahashi