Study on the Semi-Dynamic Leaching Characteristics of CD Contaminated Soils Solidified/Stabilized with Phosphate under the Condition of Acid Rain
Study on the Semi-Dynamic Leaching Characteristics of CD Contaminated Soils Solidified/Stabilized with Phosphate under the Condition of Acid Rain
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DOI：
10.1061/9780784480434.045
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
H. L. Wu;Y. Du;Fei Wang;M. Wei;Y. Feng
中科院分区：
文献类型：
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作者：
H. L. Wu;Y. Du;Fei Wang;M. Wei;Y. Feng
pH 值显着影响稳定/固化重金属污染土壤的浸出性。扩散系数（De）和延迟因子（Rd）对于定量评估稳定/固化污染土壤对周围环境的影响至关重要。本研究研究了从新型粘合剂稳定/固化的镉污染土壤中浸出的镉的扩散。通过解吸试验和半动态浸出试验等一系列试验分别测定了明显扩散系数(Dobs)和Rd。解吸测试结果表明，Cd的浸出浓度随着初始浓度的增加而增加，且解吸曲线符合Freundlich解吸/吸附模型。半动态浸出试验结果表明，累积重金属质量与时间呈对数线性关系。结果表明，Cd的Dobs计算为2.11×10-12，Cd的延迟因子确定为109.7，De为2.32×10-10m2/s。
pH values significantly affect leachability of stabilized/solidified heavy metals contaminated soils. The diffusion coefficient (De) and the retardation factor (Rd) are essential for quantitative assessment of the impact of stabilized/solidified contaminated soils on surrounding environment. Diffusion of Cd leached from a new binder stabilized/solidified Cd-contaminated soil are investigated in this research. A series of tests including desorption test and semi-dynamic leaching test conduct to determine the obvious diffusion coefficient (Dobs) and theRd, respectively. Desorption test results show that leached concentrations of Cd increase with the increase of its initial concentrations and a desorption curve fit well in the Freundlich desorption/adsorption model. The semi-dynamic leaching test results show that the accumulated heavy metal mass has a linear-relationship with time on a logarithmic scale. The results demonstrate that theDobsof Cd calculated at 2.11×10-12, the retardant factor of Cd determined as 109.7 and theDeis therefore determined as 2.32×10-10m2/s.