Department of Earth Sciences, Geochemistry, Faculty of Geosciences, Utrecht University, PO Box 80.021, 3508 TA Utrecht, The Netherlands.
Sci Total Environ. 2012 Oct 1;435-436:1-6. doi: 10.1016/j.scitotenv.2012.07.010. Epub 2012 Jul 28.
Polycyclic aromatic hydrocarbons (PAH) are persistent and toxic contaminants which are difficult to remove from fine porous material like clayey soils. The present work aims at studying two electroremediation techniques for the removal of PAHs from a spiked natural silt soil from Saudi Arabia and a silty loam soil from The Netherlands which has been exposed to tar contamination for over 100 years. The two techniques at focus are electro-osmosis and electrodialysis. The latter is applied for the first time for the removal of PAH. The efficiency of the techniques is studied using these two soils, having been subjected to different PAH contact times. Two surfactants were used: the non-ionic surfactant Tween 80 and anionic surfactant sodium dodecyl sulphate (SDS) to aid desorption of PAHs from the soil. Results show a large discrepancy in the removal rates between spiked soil and long-term field contaminated soil, as expected. In spiked soil, electro-osmosis achieves up to 85% while electrodialysis accomplishes 68% PAH removal. In field contaminated soil, electro-osmosis results in 35% PAH removal whereas electrodialysis results in 79%. Short recommendations are derived for the up-scale of the two techniques.
多环芳烃（PAH）是持久性有毒污染物，难以从黏土等细孔性物质中去除。本研究旨在研究两种电修复技术，用于去除从沙特阿拉伯受污染天然粉土和荷兰受焦油污染超过 100 年的粉质壤土中提取的 PAH。这两种技术分别为电渗析和电渗析。电渗析是首次用于去除 PAH。这两种技术在不同的 PAH 接触时间下对土壤进行处理，研究了其效率。使用了两种表面活性剂：非离子表面活性剂吐温 80 和阴离子表面活性剂十二烷基硫酸钠（SDS）以帮助 PAH 从土壤中解吸。结果表明，受污染土壤和长期受污染土壤之间的去除率存在很大差异，这是意料之中的。在污染土壤中，电渗析的去除率最高可达 85%，而电渗析的去除率可达 68%。在受污染土壤中，电渗析的去除率为 35%，而电渗析的去除率为 79%。针对这两种技术的放大提出了一些简短的建议。
