Removal of hexavalent chromium of contaminated soil by coupling electrokinetic remediation and permeable reactive biobarriers
Removal of hexavalent chromium of contaminated soil by coupling electrokinetic remediation and permeable reactive biobarriers
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DOI：
10.1007/s11356-011-0694-y
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发表时间：
2012-06
影响因子：
5.8
通讯作者：
B. Fonseca;M. Pazos;T. Tavares;M. A. Sanromán
中科院分区：
文献类型：
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作者：
B. Fonseca;M. Pazos;T. Tavares;M. A. Sanromán
目的：研究了一种新型的生态修复方法，结合两种众所周知的系统：电动修复和渗透性反应性生物屏障，来处理六价铬污染的土壤。电场促进六价铬氧阴离子向阳极的电迁移。在阳极电极前放置生物屏障，以促进向其方向迁移的铬的还原和保留。因此，该技术为土壤去除提供了一种全面的处理方法，而无需对受污染的废水进行后续处理。方法将两种不同的可渗透反应性生物屏障通过活性炭或沸石载体进行耦合。施加10 V的电场，测试了9天和18天两种不同的处理时间。结果在沸石和活性炭生物屏障的作用下，电动力学处理的去除率分别为60%和79%，试验周期为18 d。两种体系的六价铬还原为三价铬约为45%。结论两种生物屏障与电解法有效耦合，可有效去除土壤中铬（VI）的污染。此外，还证明了新开发的耦合技术（电动力+生物屏障）处理低渗透污染土壤的可行性。
PurposeIn this study, a novel and ecological alternative have been developed to treat soils contaminated with hexavalent chromium coupling two well-known systems: electrokinetic remediation and permeable reactive biobarriers. The electric field promotes the electromigration of the hexavalent chromium oxyanions towards the anode. The biobarriers were placed before the anode electrode, in order to promote the reduction and retention of the chromium migrating in its direction. Thus, this technology provided a global treatment to soil removal without subsequent treatments of the contaminated effluents.MethodsThe electrokinetic system was coupled with two different permeable reactive biobarriers composed byArthrobacter viscosusbacteria, supported either in activated carbon or zeolite. An electric field of 10 V was applied and two different treatment times of 9 and 18 days were tested.ResultsRemoval values of 60% and 79% were obtained when electrokinetic treatment was coupled with zeolite and activated carbon biobarriers, respectively, for a test period of 18 day. The reduction of hexavalent chromium to trivalent chromium was around 45% for both systems.ConclusionsIn this work, two types of biobarriers were efficiently coupled to electrokinetic treatment to decontaminate soil with Cr(VI). Furthermore, the viability of the new coupling technology developed (electrokinetic + biobarriers) to treat low-permeability polluted soils was demonstrated.