| 摘要 |
<p>The present invention relates to a process for cleaning soil wherein the soil to be cleaned is brought into a layer with a thickness of 1 to 2 m on an impermeable bottom, liquid is spread over the soil and liquid is withdrawn from the bottom side of the soil depot by means of a drainage system wherein the liquid withdrawn from the soil is subjected to a biological and/or physical-chemical purification and the excess of liquid, if any, is thus discarded and the remainder is supplied to the soil again, if desired after the addition of nutrients and/or micro-organisms and/or an extraction agent or detergent. If desired, the soil can be worked periodically. Especially in case of volatile components, air is withdrawn from the soil to remove the volatiles. Air injection is an expedient means to provide additional oxygen in the soil.</p> |
