Normandie University, ULHN, LOMC UMR CNRS 6294, FR CNRS 3730 SCALE, Le Havre, France.
Normandie University, URN, COBRA UMR CNRS 6014, FR CNRS 3730 SCALE, Evreux, France.
Chemosphere. 2019 Aug;228:744-755. doi: 10.1016/j.chemosphere.2019.04.063. Epub 2019 Apr 11.
Electrokinetic (EK) remediation is often developed for metal decontamination but shows limitations for polycyclic aromatic hydrocarbons (PAHs) and polychlorobiphenyls (PCBs) which are nonionic and involve low aqueous solubility. This paper reports many laboratory studies devoted to the investigations of EK efficiency on the mobility and the removal of metals, PAHs and PCBs from dredged sediments, using a mixture of chelating agent and surfactants. The results showed that increasing chelating agent concentration was favorable for both metal and PAH removal. Applying a periodic voltage gradient associated to a low concentration of additives provided the best removal of Zn, Cd and Pb and also the 16 priority PAHs. The tested fresh harbor sediment was highly resistant to metals and organics mobilization and transport because of an aged contamination, a high buffering capacity, a very low hydraulic permeability and a high organic matter content. However, experiments performed on a former sediment which was deposited many years ago provided better removal results, involving low organic matter and carbonates content. The efficiency of the EK process was also assessed by measuring the acute toxicity of the EK-treated sediment on the copepod Eurytemora affinis exposed to sediment elutriates.
电动修复（EK）通常用于金属去污，但对于非离子性、水溶性低的多环芳烃（PAHs）和多氯联苯（PCBs）则存在局限性。本文报道了许多实验室研究，这些研究致力于使用螯合剂和表面活性剂的混合物，调查 EK 效率对疏浚沉积物中金属、PAHs 和 PCBs 的迁移和去除的影响。结果表明，增加螯合剂浓度有利于金属和 PAH 的去除。施加周期性电压梯度并结合低浓度添加剂，可实现 Zn、Cd 和 Pb 以及 16 种优先 PAHs 的最佳去除。由于污染时间长、缓冲能力高、水力渗透率低以及有机物含量高，测试的新鲜港口沉积物对金属和有机物的迁移和运输具有很强的抵抗力。然而，对多年前沉积的前沉积物进行的实验提供了更好的去除效果，因为其有机物和碳酸盐含量较低。通过测量电动处理沉积物对暴露于沉积物浸出液的桡足类动物 Eurytemora affinis 的急性毒性，评估了 EK 工艺的效率。
