This study designed a practical approach of separating electrodes chambers to prove the influence of electrochemical oxidation on pyrene removal during electrokinetic (EK) remediation. The anode and cathode electrodes were arranged in two independent soil chambers, and the soil chambers were connected by salt bridges. Salt bridges electrokinetic (SBEK) remediation avoided acid–base neutralization and facilitated the intensity of the current. The results showed that 99.5% of pyrene was removed within 7 days in anodic chamber. The removal rate of pyrene was ∼99.6–99.9% at SBEK1 anode and 29.5–36.2% at SBEK1 cathode after 42 days. The changes in current, pH, and redox potential values indicated that an efficient “oxidizer” was formed in the anode chamber. Compared with conventional EK remediation, SBEK can take place under a suitable oxidizing condition because of increasing current intensity and decreasing soil pH in the anode chamber. Furthermore, SBEK with electrode polarity reversal test had better decontamination efficiency of pyrene than fixed electrodes. Removal rate of pyrene increased to 62.9% after 14 days with polarity reversal; correspondingly, the energy consumption of SBEK test was ∼13 times higher than that of the conventional EK test. The novel application of separated electrodes chambers appears to be a viable strategy for removing organic pollutants.

中文翻译：

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在电动修复过程中通过阳极附近的电化学氧化去除有机污染物：概念验证

本研究设计了一种分离电极室的实用方法，以证明电化学氧化对电动 (EK) 修复过程中芘去除的影响。阳极和阴极电极布置在两个独立的土室中，土室之间通过盐桥连接。盐桥电动（SBEK）修复避免了酸碱中和并促进了电流强度。结果表明，在阳极室7天内，99.5%的芘被去除。42天后，SBEK1阳极的芘去除率为~99.6-99.9%，SBEK1阴极为29.5-36.2%。电流、pH 值和氧化还原电位值的变化表明在阳极室中形成了有效的“氧化剂”。与传统的EK修复相比，SBEK 可以在合适的氧化条件下发生，因为阳极室中电流强度的增加和土壤 pH 值的降低。此外，带有电极极性反转测试的SBEK对芘的去污效率优于固定电极。极性反转14天后芘去除率提高到62.9%；相应地，SBEK 测试的能耗比传统的 EK 测试高 13 倍。分离电极室的新颖应用似乎是去除有机污染物的可行策略。极性反转 14 天后 9%；相应地，SBEK 测试的能耗比传统的 EK 测试高 13 倍。分离电极室的新颖应用似乎是去除有机污染物的可行策略。极性反转 14 天后 9%；相应地，SBEK 测试的能耗比传统的 EK 测试高 13 倍。分离电极室的新颖应用似乎是去除有机污染物的可行策略。