| 摘要 |
A process for the treatment of material which is or is suspected to be contaminated with one or more actinides or their radioactive decay products or fission products or other heavy metals, eg chromium, lead, cadmium or mercury or compounds thereof, which process includes contacting the said material with a liquid medium which comprises a solution as follows: an aqueous solution which is free of heavy metal ions prior to use thereof and comprises ingredients which are naturally degradable to non-toxic products with or without mild physical assistance such as heat or ultra-violet radiation, said solution comprising: (a) carbonated water; (b) a conditioning agent; and (c) a complexing agent which comprises the anion of a carboxylic acid having from 2 to 6 carbon atoms; wherein the said process is for soil treatment for land remediation and includes the steps of removing soil from a site of contamination or suspected contamination, transporting the soil to a treatment site and washing the soil with the said liquid medium thereby dissolving contaminants as complexes in said liquid medium. The conditioning agent may be selected from hydrogen peroxide, ozone, oxygen-enriched air, potassium permanganate, hydrazine and hydroxylamine and the complexing agent may be an anion of a carboxylic acid selected from citric acid, acetic acid, oxalic acid and ethylenediamine tetracetic acid. |
