Chelator-enhanced phytoextraction coupling with soil washing to remediate multiplemetals-contaminated soils
The phytoremediation of metal-contaminated soils in combination with chemical methods such as soil washing could be more effective than single technology. In this study, pot experiments were carried out to study the effects of chelators including a mix ture of chelators (MC), monosodium glutamate waste liquid (MGWL) and EDTA, to enhance Zn, Cd and Pb uptaken by Sedum alfredii Hance. The metal washing efficiency and the environment risk caused by these chelators were also assessed. Furthermore, the rhizofiltration with Rumex crispus was established to investigate the potential of plant hairy roots to remove metals in leachates. Results showed that compared to MGWL and EDTA, MC improved significantly Cd phytoextraction efficiency and left lower environment risk to underground water. MC may be the appropriate choice to enhance phytoextaction of S. alfredii H. Leaching with the MC or EDTA removed Pb, to which phytoextraction is not effective. But heavy metals and organics in leachates were also increased with theaddition of chelators and could lead to secondary pollution of underground water, particularly with EDTA. The combination of MC enhanced phytoextraction with hyperaccumulator S. alfredii H. and in situ soil washing could be an interesting technology to remediate metal (Zn, Cd and Pb) contaminated soils if an appropriate leachate handling method is found.
metal sedum alfredii Hance phytoextraction chelator rhizofitration
Zumei GUO Zebin WEI Xinxian LONG Qi-Tang Wu
College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
172-173
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）