反复冻融与高温老化对砷污染土壤固化稳定化效果的影响
发布时间：2018-10-11 09:50
【摘要】：通过无侧限抗压强度、渗透系数、浸出浓度以及形态分布测试,分别考察了不同条件下反复冻融和高温老化作用对砷污染土壤固化或稳定化效果的影响,同时利用扫描电镜分析了稳定化土壤的微观形貌变化.结果表明,反复冻融和高温老化处理均会不同程度地削弱固化土壤的抗压强度,并提高其渗透系数.两种处理会增加稳定化土壤中砷的不稳定形态,从而增大其浸出浓度,如反复冻融处理300次后,稳定化土壤中砷的不稳定形态增加了19.81%,浸出浓度由115.5μg·L~(-1)增加至151.5μg·L~(-1),80℃高温老化10 h后,砷的不稳定形态增加了25.1%,浸出浓度增加至164.5μg·L~(-1).反复冻融次数的增加、老化温度的升高以及老化时间的延长,均会分别增大对固化/稳定化效果的影响.稳定化土壤经反复冻融和高温老化处理后,会发生不同程度的碎裂,呈现结构松散状.
[Abstract]:The effects of repeated freezing and thawing and high temperature aging on the solidification and stabilization of arsenic-contaminated soil were investigated by testing the unconfined compressive strength, permeability coefficient, leaching concentration and speciation distribution of arsenic-contaminated soil under different conditions. At the same time, the microstructure of stabilized soil was analyzed by scanning electron microscope (SEM). The results showed that repeated freezing and thawing treatment and high temperature aging treatment could weaken the compressive strength and increase the permeability of solidified soil in varying degrees. The two treatments increase the unstable form of arsenic in the stabilized soil, thus increasing its leaching concentration, such as after 300 times of repeated freezing and thawing, The unstable form of arsenic in stabilized soil increased 19.81, and the leaching concentration increased from 115.5 渭 g / L ~ (-1) to 151.5 渭 g / L ~ (-1). After aging at 80 鈩，
本文编号：2263752
[Abstract]:The effects of repeated freezing and thawing and high temperature aging on the solidification and stabilization of arsenic-contaminated soil were investigated by testing the unconfined compressive strength, permeability coefficient, leaching concentration and speciation distribution of arsenic-contaminated soil under different conditions. At the same time, the microstructure of stabilized soil was analyzed by scanning electron microscope (SEM). The results showed that repeated freezing and thawing treatment and high temperature aging treatment could weaken the compressive strength and increase the permeability of solidified soil in varying degrees. The two treatments increase the unstable form of arsenic in the stabilized soil, thus increasing its leaching concentration, such as after 300 times of repeated freezing and thawing, The unstable form of arsenic in stabilized soil increased 19.81, and the leaching concentration increased from 115.5 渭 g / L ~ (-1) to 151.5 渭 g / L ~ (-1). After aging at 80 鈩，
本文编号：2263752
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