Effects of different freezing rates on purification efficiency of sandy soil contaminated by heavy metal copper
Effects of different freezing rates on purification efficiency of sandy soil contaminated by heavy metal copper
复制标题
不同冻结速率对重金属铜污染沙土净化效率的影响
DOI：
10.1016/j.coldregions.2019.03.015
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发表时间：
2019-07
影响因子：
4.1
通讯作者：
Liang Hengchang
中科院分区：
文献类型：
--
作者：
Liu Shuxing;Wang Jianzhou;Zhou Guoqing;Chen Tuo;Zhou Yang;Wang Tao;Mu Yanhu;Liang Hengchang
在过去的几十年里，已经开发了各种方法来处理受污染的场地。采用哪种技术取决于污染物的类型、扩散程度以及清理过程中额外污染的可能性。可选择的潜在技术之一是人工冻结法，即冻结土壤，以大大降低渗透性，防止污染物进一步扩散。虽然这种方法在理论上似乎有优点，但很少有研究调查土壤冻结过程中污染物的迁移。本文进行了一系列的人工冷冻净化试验，研究了不同冷冻速率对净化效果的影响。实验结果表明，冷冻速率是影响重金属铜冷冻净化效率的重要因素，随着冷冻速率的增大，净化率迅速下降。土壤冻结速率为0.3 °C/h时，重金属铜的净化率仅为27%;远低于冻结速率为0.05 °C/h时的净化率85%。研究表明，重金属铜的净化率与土壤冻结速率之间存在着很强的相关性。我们还证明，净化率可以表示为土壤冻结率的立方。因此，污染场地的最佳净化可以通过确定适当的冷冻速率来实现。
Over the last several decades, a variety of methods have been developed for treating contaminated sites. Which technique is applied depends on the type of contaminant, the extent of dispersion, and the likelihood of additional contamination during the cleanup. Among the selection of potential techniques is the artificial freezing method, in which soil is frozen to significantly lower the permeability and prevent further diffusion of pollutants. While this method appears to have merit in theory, few studies have investigated the migration of pollutants during the soil freezing process. In this paper, a series of artificial freezing purification tests were performed and the influences of different freezing rates on purification efficiency were investigated. The experimental results show that the freezing rate is an important factor affecting the freezing purification efficiency for heavy metal copper and the purification rate decreases rapidly with increasing freezing rate. A soil freezing rate of 0.3 °C/h results in a heavy metal copper purification rate of only 27%; far less than that of the freezing rate of 0.05 °C/h, where the purification rate is 85%. This study demonstrates that a strong correlation exists between the purification rate of heavy metal copper and the soil freezing rates. We also demonstrate that the purification rate can be expressed as a cubic of the soil freezing rate. Therefore, the optimal purification of contaminated sites can be obtained by determining the proper freezing rate.
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影响因子：
1.4
作者：
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通讯作者：
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影响因子：
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作者：
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