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| Microwave-enhanced Remediation of Cd, Pb and Zn Contaminated Soil Using EDDS as a Leaching Agent |
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| KeyWord:Cd; Pb; Zn; leaching; microwave-enhanced; EDDS |
| Author Name | Affiliation | | XUE La-mei | State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University | | LIU Zhi-chao | State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University | | YIN Ying | State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University | | SUN Yuan-yuan | State Key Laboratory of Pollution Control and Resource Reuse, Hydrosciences Department, Nanjing University | | GUO Hong-yan | State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University |
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| Abstract: |
| With the rapid industrialization and urbanization in the world, soil pollution is intensifying, especially heavy metal contamination. A new approach using microwave coupled to EDDS as a leaching agent for removal of Cd, Pb, and Zn from field soils was examined in the laboratory. Effects of time and power of microwave on removal efficiency and fractionation of heavy metals were investigated. The results showed that under microwave condition（900 W, 10 min）, the removal efficiencies of Cd, Pb, and Zn were 29%, 89%, and 71%, respectively, increased by 8%, 26%, and 33%, respectively, compared with those without microwave treatment. In addition, the processing time was greatly reduced from 6 h to 10 min. Sequential extraction results showed that the exchangeable, carbonate bound and Fe-Mn oxide bound fractions of metal concentrations were obviously reduced after treatment, by 34%, 90%, and 83% for Cd, Pb, and Zn, respectively, whereas the residual fraction was increased, which reduces ecological risks of heavy metals. Microwave-assisted leaching can be a promising remediation method for heavy metal contaminated sites. |
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