Contamination and Remediation of Heavy Metals in Soils near E-waste Recycling Area

摘要

In order to assess heavy metals pollution in agricultural soil after renovation in typical e-waste recycling areas,212 soil samples were collected and the mass fractions of 7 kinds of heavy metals(Cd,Cr,Cu,Hg,Ni,Pb and Zn)were analyzed.The results indicated that heavy metals pollution in agricultural soil was commonly existed in the study areas,and the soil was slightly contaminated by Pb but was moderately or critically polluted by Cd and Cu.However,the carcinogenic risk and non-carcinogenic risk status by heavy metals pollution were beyond acceptable levels,and soil remediation was quite necessary.After some investigations of bioremediation,we found that saponin as washing agent could highly strengthen the behavior of heavy metals desorption from soil,which had a good prospect of engineering practice.