电动力耦合PRB技术修复POPs污染土壤

针对传统电动法修复土壤中持久性有机污染物（POPs）效率较低的问题，研究了电动力耦合渗透性反应墙（PRB）技术以提高污染物去除效率。以菲和2，4，6-三氯苯酚为目标污染物，铁碳混合物作为PRB填料，通过预实验确定了污染物的迁移方向及PRB的设置位置（靠近阴极），探究最佳修复时间和电压梯度下人工配制模拟污染土壤中目标污染物的去除效果。结果表明：菲和2，4，6-三氯苯酚都是随着电渗流从阳极向阴极进行迁移。在电压梯度为1 V·cm-1，控制铁碳PRB的pH为4，铁碳质量比为6∶1的条件下，经过15 d的修复，菲总去除率可比传统电动力技术提高69.86%，2，4，6-三氯苯酚总去除率可比传统电动力技术提高71.53%。研究表明，电动力耦合PRB比传统电动力技术有明显的优势，在修复有机污染土壤方面具有良好的发展前景。

Remediation of POPs contaminated soil using electrokinetics coupled with permeable reactive barrier

Eelectrokinetic remediation coupled with permeable reactive barrier (EK-PRB) was used to promote the remediation efficiency of persistent organic pollutants (POPs) contaminated soils because a conventional electrokinetic method provides low POPs removal. Treatment of phenanthrene and 2,4,6-trichlorophenol in soil was studied in bench-scale experiments. The PRB evaluated in the present study was made of iron and activated carbon. A preliminary experiments was conducted to determine the migration direction of contaminants based on which the best location for PRB was decided. Our objective was to investigate the process of POPs removal from artificially contaminated soil by EK-PRB under optimal conditions. The results showed that both phenanthrene and 2,4,6-trichlorophenol migrated from the anode to the cathode with electroosmotic flow. Under optimal reaction conditions with voltage gradient of 1 V·cm-1, reaction time of 15 days and PRB pH of 4, iron-carbon mass ratio of 6:1, the total removal of phenanthrene increased by 69.86% compared with the conventional electrokinetic method, and the total removal rate of 2,4,6-trichlorophenol increased by 71.53%. These results indicated that electrokinetics coupled with permeable reactive barrier is promising for remediation of organic contaminated soil.