Immobilization of Pb, Cu, and Zn in a Multi-Metal Contaminated Soil Amended with Triple Superphosphate Fertilizer and Phosphate Rock Tailing

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 356-360)
• Pages: 1716-1718
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.356-360.1716
• Online since: October 2011
• Authors: Yuan Liang, Xiao Chun Wang, Xin De Cao, Ling Zhao
• Keywords: Column Leaching, Heavy Metal, Immobilisation, Phosphorous Amendments

References

[1] Cao, X. D.,Ma, L. Q.,Rhue, D. R. et al: Environmental Pollution.131:435-444(2004).

[2] Halim, C. E.,Scott, J. A.,Amal, R. et al: Journal of Hazardous Materials.120:101-111(2005).

[3] Xu, Y., Schwartz, F.W., Traina, S.J.: Environ. Sci. Technol. 28:1472-1480(1994).