Performance of electroremediation in real contaminated sediments using a big cell, periodic voltage and innovative surfactants.
Performance of electroremediation in real contaminated sediments using a big cell, periodic voltage and innovative surfactants.
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DOI：
10.1016/j.jhazmat.2016.08.003
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发表时间：
2016-12
影响因子：
13.6
通讯作者：
J. Hahladakis;Antonis Latsos;E. Gidarakos
中科院分区：
文献类型：
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作者：
J. Hahladakis;Antonis Latsos;E. Gidarakos
目前的工作重点是评估电动（EK）处理含有有毒金属和多环芳烃（PAHs）的真实污染沉积物，使用大型实验室EK电池，周期电压和最近测试的非离子表面活性剂。结果表明，“白天-晚上-休息”的电压应用模式，以及所选择的增溶剂，有利于整个EK过程。砷、镍和铬的去除率最高，分别为83%、67%和63%，锌和铅的去除率最高，分别为54%和41%。此外，在电解质室中引入非离子表面活性剂的实验中，整个EK电池的沉积物中多环芳烃被均匀去除，这表明增强剂的高增溶能力。从本质上讲，在某些情况下，多环芳烃的运输和去除（特别是在电解质室附近的部分）也发生在未增强的EK运行中，主要是由于它们的负电荷，它们与土壤基质的潜在弱键以及周期性的电压施加。使用Nonidet P40可最大限度地去除细胞中初始多环芳烃总量的1/3（约6498 μg / 20145 μg）。
The present work focused on evaluating the electrokinetic (EK) treatment of real contaminated sediments with toxic metals and polycyclic aromatic hydrocarbons (PAHs), using a big laboratory EK cell, periodic voltage and recently tested non-ionic surfactants. The results indicated that the “day on-night off” application mode of voltage, in conjunction with the selected solubilising agents, favoured the overall EK process. Arsenic, nickel and chromium exhibited the highest removal percentages, obtaining 83%, 67% and 63%, respectively, while zinc and lead attained 54% and 41% at the maximum. Furthermore, in the experiments where the non-ionic surfactants were introduced in the electrolyte chambers, there was a major uniformly removal of PAHs from the entire sediment across the EK cell, indicating the high solubilisation capacity of the enhancing agents. Essentially, transport and in some cases removal of PAHs (particularly from sections adjacent to the electrolyte compartments) also occurred in the unenhanced EK run, mainly due their negative charge, their potential weak bonds to the soil matrix and to the periodic application of voltage. Maximum removal was obtained by the use of Nonidet P40 where app. 1/3 (ca. 6498 μg out of 20145 μg) of the total initial amount of PAHs were removed from the cell.