| 摘要 |
A method is provided for the treatment of hydrocarbon-contaminated soil by chemical hydrolysis and/or oxidation of the hydrocarbons in the hydrocarbon-contaminated soil. The method includes conditioning lime with a hydrophobizing agent, the essential component of which is a mixture of particular fatty acids, in a particular way. The thus-conditioned lime is intimately blended with physically-preconditioned moist, hydrocarbon-contaminated soil, under conditions of high shear, the degree of blending being at least near microscopic level. A charge of such blended conditioned lime/soil mixture is conveyed to an enclosed reaction vessel, either continuously or batchwise, and hydration of the lime in the blended conditioned lime/soil charge is carried out. The heat of the hydration reaction is retained within the vessel. Substantially simultaneously, air and/or oxygen-enriched air is introduced into the reaction vessel, together with steam and/or water, thereby to effect a flameless, intermediate-temperature oxidation of the hydrocarbons or of their hydrolysed degradation products. These products are passed through the blended conditioned lime/soil charge at a progressively increasing temperature. Decontaminated soil product is discharged from the reaction vessel and may be cooled and then passed through a zone where it may be sprayed with a surfactant. The decontaminated soil product is passed to a blender where it is mixed with sufficient water to provide a substantially dust-free product. <IMAGE> |
