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| Remediation of Cu and Pb co-polluted sediments by three submerged plants |
| Received:October 12, 2015 |
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| KeyWord:submerged plants;heavy metal;pollution;enrichment |
| Author Name | Affiliation | E-mail | | XIE Pei-jun | Zhejiang Normal University Xingzhi College, Jinhua 321004, Zhejiang, China
Institute of Ecology, Zhejiang Normal University, Zhejiang Jinhua 321004, China | | | LI Ming-hong | Zhejiang Normal University Xingzhi College, Jinhua 321004, Zhejiang, China
Institute of Ecology, Zhejiang Normal University, Zhejiang Jinhua 321004, China | sky82@zjnu.cn | | YAN Li-rong | Institute of Ecology, Zhejiang Normal University, Zhejiang Jinhua 321004, China | | | QIAO Yun-lei | Zhejiang Normal University Xingzhi College, Jinhua 321004, Zhejiang, China
Institute of Ecology, Zhejiang Normal University, Zhejiang Jinhua 321004, China | |
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| Abstract: |
| Many studies have reported that submerged plants can remove heavy metals in sediments via their root absorption, thus reducing the amount of heavy metals released from sediments into the water. Thus, submerged plants could be the important plants of phytoremediation technology. In the present study, differences in Cu and Pb accumulation by different submerged plants, Vallisneria natans, Hydrilla verticillata and Ceratophyllum demersum, in polluted sediments were investigated using an outdoor eco-cylinder static simulation test. Results indicated:The best time for the enrichment of Vallisneria natans and Hydrilla verticillata was 84~105 d after transplanting into the polluted sediments, while Ceratophyllum demersum was 63~84 d. Hydrilla verticillata showed the strongest accumulation ability for Cu, with a maximum BSAF(Biota-sediment accumulation factor, the ratio of heavy metal content in whole plant to that in sediments) of 15.2, which was 2.9 times that of Vallisneria natans, 2.7 times that of Ceratophyllum demersum. In addition, there was a significant negative correlation between the content of Cu in Hydrilla verticillata and in sediments(r=-0.995, P<0.05). Accumulation ability of three submerged plants for the same element showed significant differences. For Cu, Hydrilla verticillata had the greatest accumulation ability, followed by Ceratophyllum demersum, and Vallisneria natans was the smallest one. However, the accumulation ability for Pb was Vallisneria natans >Hydrilla verticillata >Ceratophyllum demersum. Hydrilla verticillata had the best comprehensive restoration effect for Cu-Pb pollution. There were significant decreases in Cu-Pb pollution and content at the end of one growth cycle(P<0.05). The remediated sediments met the second level of the Soil Environmental Quality Standard(GB15618-1995). Hydrilla verticillata could reduce Cu content in the sediments to the first level of the Soil Environmental Quality Standard. |
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