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| Remediation of a heavy metal contaminated site：in-situ solidification and stabilization |
| XIA Weiyi1，DU Yanjun1，FENG Yasong1，LI Fasheng2，LI Chunping3，YAN Xiulan4，REN Weiwei1，ZHANG Liming1 |
| (1. School of Transportation，Southeast University，Nanjing，Jiangsu 210096，China；2. Chinese Research Academy of Environmental Sciences，Beijing 100012，China；3. Beijing Building Materials Academy of Science Research，Beijing 100041，China；4. Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China) |
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Abstract The in-situ solidification and stabilization(S/S) technique using SPC was implemented to remediate a heavy metal contaminated site nearby a Pb-Zn smelter in Gansu，China. Several series of tests were conducted to examine the water content，soil pH，metal leachability，metal speciation and penetration resistance of untreated soils and stabilized soils. The influence of binder contents on these physical，chemical and mechanical characteristics，as well as the fixation mechanisms of Pb，Zn and Cd by SPC were also investigated. The results show that in-situ S/S using SPC reduces significantly the water contents but raises the pH values of contaminated soils. The leached Pb，Zn and Cd concentrations decrease. The metal leachability satisfies the corresponding criteria for solid waste. The large percentages of Pb，Zn and Cd are transferred from the exchangeable fraction to residual fraction after in-situ S/S using SPC. The penetration resistance of stabilized soil increased with the increasing in the SPC content.
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2017, Vol. 36 
