School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221008, Jiangsu Province, China; Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, Jiangsu Province, China.
School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221008, Jiangsu Province, China.
J Hazard Mater. 2019 May 5;369:448-455. doi: 10.1016/j.jhazmat.2019.02.043. Epub 2019 Feb 13.
This work investigated the influences of citric acid and methyl-β-cyclodextrin (MCD) as enhancing agents during the electrokinetics (EK)-persulfate process on the remediation of soil artificially contaminated with decabromodiphenyl ether (BDE-209) and copper (Cu) with an initial concentration of 50 and 1000 mg/kg, respectively. The results clearly demonstrate the efficiency of the process while at the same time, the distribution of the residual contaminants in soil and the EK parameters were greatly influenced by the presence of persulfate, MCD and citric acid. The results show that there was significant removal of BDE-209 and Cu from the soil. MCD-assisted process gave the highest BDE-209 removal (88.6%) and the third largest Cu removal (54.3%) from the soil. Comparatively, the highest Cu removal (92.5%) and the second largest BDE-209 removal (85.6%) were achieved by the joint application of MCD and citric acid in anolyte during the EK-persulfate treatment. MCD and citric acid could increase soil electrical current and electroosmotic flow during EK. The alkalization of soil near cathode was alleviated by the acidic byproducts of persulfate decomposition which could be transported to the soil by electroosmosis and electromigration. This integration process may provide a green efficient technology for remediating co-contaminated soil.
本研究考察了电动力学（EK）-过硫酸盐过程中作为增强剂的柠檬酸和甲基-β-环糊精（MCD）对人工污染土壤中十溴二苯醚（BDE-209）和铜（Cu）的修复的影响，初始浓度分别为 50 和 1000mg/kg。结果清楚地表明了该过程的效率，同时，过硫酸盐、MCD 和柠檬酸的存在极大地影响了土壤中残留污染物的分布和 EK 参数。结果表明，BDE-209 和 Cu 从土壤中有显著去除。MCD 辅助过程可使土壤中 BDE-209 的去除率达到最高（88.6%），Cu 的去除率达到第三高（54.3%）。相比之下，在 EK-过硫酸盐处理中，MCD 和柠檬酸在阳极电解液中的联合应用可使 Cu 的去除率达到最高（92.5%），BDE-209 的去除率达到第二高（85.6%）。MCD 和柠檬酸可在 EK 过程中增加土壤电流和电渗流。过硫酸盐分解的酸性副产物缓解了阴极附近土壤的碱化，这些副产物可通过电渗流和电迁移输送到土壤中。这种整合过程可能为治理复合污染土壤提供一种绿色高效的技术。
