Abstract:

In order to study repairing methods for soil contaminated by Pb, eco-friendly material walnut shell and peanut hull were used to remedy soil contaminated by Pb. By artificial methods of soil pollution and adding different proportions of repairing material, the ratio changes of active state of heavy metals were evaluated and a scientific assessment was made to provide a scientific basis for restoration of soil contaminated by Pb. The results showed that: (1)walnut shell and peanut hull were applicable to the light soil contaminated by Pb, in the simulation the decreased range of effective state of Pb was 17.59%-19.22%; (2)for the same pollution level, different proportion of walnut shell and peanut hull had different effects in repairing, at the given dosage range, the best ratio was 5%; (3)walnut shell and peanut hull were not applicable to serious soil contaminated by Pb; (4) peanut hull had a better repair effect on lead contaminated soil than walnut shell’s effect.