Immobilization of Pb, Cu, and Zn in a Multi-Metal Contaminated Soil Amended with Triple Superphosphate Fertilizer and Phosphate Rock Tailing
Immobilization of Pb, Cu, and Zn in a Multi-Metal Contaminated Soil Amended with Triple Superphosphate Fertilizer and Phosphate Rock Tailing
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DOI：
10.4028/www.scientific.net/amr.356-360.1716
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
Yuan-Yuan Liang-Yuan;X. C. Wang;Xinde Cao;Ling Zhao
中科院分区：
文献类型：
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作者：
Yuan-Yuan Liang-Yuan;X. C. Wang;Xinde Cao;Ling Zhao
本研究的目的是利用重过磷酸钙肥料（TSP）和磷矿尾矿（PR）的材料，单独和组合在一个多金属污染的土壤中的铅，铜，锌。通过模拟降雨条件下的柱淋溶实验评价了处理效果。在未施磷和施磷的土柱中，90%以上的Pb和Cu被固定在土壤表层（0- 10 cm）。然而，显着的向下迁移的Zn在未处理或P处理的柱土壤剖面中观察到，虽然运输被P处理抑制。在未处理的土壤中，有27.2%的Zn向下迁移到10- 20 cm土层，而在TSP、PR和PR+TSP处理中，分别有7.45%、13.0%和11.2%的Zn向下迁移。磷酸盐对污染土壤中Pb和Cu的淋溶有明显的抑制作用，淋溶液中Pb和Cu的去除率分别达到71.2%和34.8%。除TSP外，P处理均能促进Zn的淋失。结果表明，在多金属污染土壤中，重过磷酸钙肥料和磷矿尾矿对Pb的固定效果最好，其次是Cu，而对Zn的固定效果较差。
The objective of this study is to immobilize Pb, Cu, and Zn in a multi-metal contaminated soil using triple superphosphate fertilizer (TSP) and phosphate rock tailing (PR) materials, alone and in combination. The treatment effectiveness was evaluated with a column leaching experiment under simulated rainfall conditions. More than 90% of Pb and Cu were stabilized in the upper layer soil (0-10cm) in both untreated and P-treated soil columns. However, the significant downward migration of Zn was observed in either untreated or P-treated column soil profiles though the transport was inhibited by P treatments. In the untreated soil, 27.2% of Zn migrated down to the subsurface soil (10-20cm), while there were 7.45%, 13.0%, and 11.2% of Zn transported down in the TSP, PR, and PR+TSP treatments, respectively. Phosphate reduced the leaching of Pb and Cu from the contaminated soils, with reduction of Pb and Cu in the leachate by up to 71.2% and 34.8%, respectively. However, Zn leaching was enhanced by P treatments except for TSP. The results indicated that triple superphosphate fertilizer and phosphate rock tailing were effective in immobilizing Pb followed by Cu, but less for Zn in a multi-metal contaminated soil.