| 摘要 |
PURPOSE: Provided is a method for treating an organohalogen compound-containing soil or ash in order to effectively decompose dioxins and dioxin precursors such as aromatic organohalogen compounds or aliphatic organohalogen compounds, e.g., trichloroethylene and dichloromethane, which are contained in the soil or ash. CONSTITUTION: A process for treating soil or ash containing an organohalogen compound includes the steps of (a) mixing the soil or ash containing an organohalogen compound with an organohalogen compound-decomposition composite catalyst which comprises an amine compound and iron compound particles and which has an average particle size of from 0.01 to 2.0 μm, a phosphorus content of not more than 0.02% by weight, a sulfur content of not more than 0.3% by weight, a sodium content of not more than 0.3% by weight, an apparent density(pa) of not more than 0.8 g/ml and a catalytic activity such that not less than 50% by weight of monochlorobenzene is decomposed when 50 mg of the composite catalyst is heat-treated at 300 deg.C for 60 minutes in air and then instantaneously contacted with 5.0x10¬-7 mol of monochlorobenzene at 300 deg.C at a space velocity of 150,000 h¬-1 in an inert gas atmosphere using a pulse catalytic reactor; and (b) heat-treating the obtained mixture at a temperature of 150 to 600 deg.C.
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