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首页> 外文期刊>Chemosphere >Washing as a remediation technology applicable in soils heavily polluted by mining-metallurgical activities
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Washing as a remediation technology applicable in soils heavily polluted by mining-metallurgical activities

机译：洗涤作为一种修复技术，适用于采矿冶金活动严重污染的土壤

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摘要

A permanent solution in order to remediate a heavily contaminated soil is washing it utilizing the appropriate reagents. The study presented in this paper deals with the washing of a soil highly polluted by mining and metallurgical activities. Pollution consists of slags, sulphur compound waste and various low grade lead condensates, all rich in heavy metals and metalloids (Pb, As, Cu, Zn, Mn and Fe). Soil was washed with deionized water, 6, 3, 2 and 1 M HCl, 6 M H_2SO_4, 6 M HNO_3 and 0.1 M Na_2EDTA. High extraction efficiency was achieved with respect to hydrochloric acid even at the lowest concentration; the solubility of pollutants in nitric acid was low, while sulphuric acid was proven to be problematic with respect to lead. Mobilization of metals and metalloids under DI water effect was minimal indicating that the elements fraction that is weakly bound to soil particles is insignificant. Furthermore, a kinetic study was undertaken, utilizing 1 M HCl and 0.1 M Na_2EDTA. Results illustrated that 1 M HCl was more effective for intermediate mixing times (up to 4 h) while 0.1 M Na_2EDTA was better applicable to short mixing times ( < 1 h) and low pH values (pH < 7.1). 1 M HCl was proven to be very effective for the removal of pollutants from contaminated soil but the high metal content of the resulting solution necessitates further treatment for the retention of metals.
机译：为了修复严重污染的土壤，一种永久性解决方案是使用适当的试剂对其进行洗涤。本文提出的研究涉及对因采矿和冶金活动而严重污染的土壤的洗涤。污染包括炉渣，含硫化合物废物和各种低品位的铅冷凝物，均富含重金属和准金属（铅，砷，铜，锌，锰和铁）。用去离子水，6、3、2和1 M HCl，6 M H_2SO_4、6 M HNO_3和0.1 M Na_2EDTA洗涤土壤。即使在最低浓度下，对盐酸的萃取效率也很高。污染物在硝酸中的溶解度较低，而硫酸被证明对铅有问题。在去离子水作用下金属和准金属的动员作用极小，这表明与土壤颗粒弱结合的元素部分微不足道。此外，进行了动力学研究，利用1 M HCl和0.1 M Na_2EDTA。结果表明，对于中间混合时间（长达4小时），使用1 M HCl更为有效，而对于较短的混合时间（<1 h）和低pH值（pH <7.1），0.1 M Na_2EDTA更好。事实证明，1 M HCl对于从受污染的土壤中去除污染物非常有效，但是所得溶液中的高金属含量要求进一步处理以保留金属。

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