| 摘要 |
Method for the cleansing and decontamination of soil by (a) the extraction of soil contaminated principally by hydrocarbons or other organic material, heavy metals and/or cyanides, by mixing the contaminated soil with water of specific pH as extractant, (b) separating the cleansed or at least partially cleansed soil from the water, (c) separating the contaminants from the water and (d) recirculating the water as extractant, whereby the soil, possibly pretreated in sieves, is washed intensively with an aqueous extractant in a washer provided with a stirrer, at a solids content of 60-80% by weight and a pH that is controlled during and after the washing to values dependent on the nature of the contaminants. |
