Key Laboratory of Marine Environment and Ecology, Ocean University of China, Ministry of Education, Qingdao 266100, PR China.
J Hazard Mater. 2010 May 15;177(1-3):1126-33. doi: 10.1016/j.jhazmat.2010.01.038. Epub 2010 Jan 15.
Chromium contaminated soil can be remediated by electrokinetic techniques. However, in practical application, Cr(VI) may migrate with water deep into the soil, contaminating previously unpolluted layers. Both horizontal and vertical electric fields were applied simultaneously to improve traditional electrokinetic remediation. Contrasting experiments using four operation modes (none, solely horizontal, solely vertical and 2D crossed electric field) were designed and tested at the bench-scale with the practical sample of chromium contaminated soil (1.3 x 10(5)mg/kg) from a chemical plant to investigate Cr(VI) migration downward in each test and the effectiveness and feasible of the new design. During the tests, Cr(VI) could migrate deep into the soil in the solely horizontal mode. Cr(VI) migration downward could be prevented by vertical barrier in the solely vertical mode. However, using the 2D crossed mode, Cr(VI) was significantly prevented from migrating downward and the chromium contaminated soil was treated effectively. Thus, the 2D crossed electric field is a promising and practical method for the remediation of contaminated soils.
铬污染土壤可以用电动力学技术进行修复。然而，在实际应用中，Cr(VI)可能会随水迁移到土壤深处，污染先前未受污染的土层。本研究采用水平和垂直电场同时施加的方式对传统电动力学修复进行了改进。通过对比实验，设计并测试了四种操作模式（无电场、仅水平电场、仅垂直电场和二维正交电场），以研究实际铬污染土壤（来自化工厂的铬含量为 1.3 x 10(5)mg/kg）中 Cr(VI)在每个测试中的向下迁移情况，以及新设计的有效性和可行性。在实验过程中，Cr(VI)在仅水平电场模式下可以迁移到土壤深处。在仅垂直电场模式下，使用垂直阻挡可以防止 Cr(VI)向下迁移。然而，采用二维正交模式时，Cr(VI)明显被阻止向下迁移，且铬污染土壤得到了有效处理。因此，二维正交电场是一种有前途且实用的污染土壤修复方法。
