To provide a method for cleaning contaminated matter, by which the amount of an exhausted acidic gas and the cleaning cost can be reduced and in which there is little risk that a cleaned matter is made alkaline.
The method for cleaning the contaminated matter includes a reduction heating process for reducing and heating the contaminated matter contaminated with organic halogen compounds and an exhaust gas treating process for cleaning an exhaust gas formed by the reduction heating process. The exhaust gas treating process comprises an oil-cleaning step for allowing undecomposed organic halogen compounds in the exhaust gas to be absorbed in oil by bringing the gas into contact with the oil, a decomposition step for decomposing the organic halogen compounds in the oil by adding an alkali metal to the oil used in the oil-cleaning step, and a hydration step for allowing the alkali metal and alkali metal halides to be absorbed in water by adding water to the oil subjected to the decomposition process. The exhaust gas treating process further has a washing step for allowing an acidic gas being a decomposition product in the exhaust gas to be absorbed in water by bringing the gas into contact with water, and the water used in the washing step is used as water to be added to the oil in the hydration step.
NAGANO TATSUKI
Seiichi Yakumaru
Hiroaki Nakatani
Tokuya Iwata
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