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<p>Polychlorinated biphenyls (PCBs) were used as dielectric fluids in transformers and capacitors until the 1990s due to their thermal stability, inertness, and insulating properties. PCBs pose a serious threat to human health and the environment because of their persistence, bioaccumulative, and toxic properties. Electrokinetic remediation (EKR) has been shown to be a promising technology for the remediation of PCB-contaminated soils. The efficiency of EKR-techniques can be further enhanced by using different chemical reagents. The present study explores the synergistic effects of surfactants, oxidants, and catalysts in removing PCBs from transformer oil-contaminated soils. Under the optimized conditions, using Tween 80 (3% v/v in anolyte), peroxydisulfate (10% w/v in catholyte), and CaMnO<sub>3</sub> activator (0.625&#xa0;g/L added to the cathode chamber) at an applied current of 1 DC Volt/cm for seven days, the mean PCB removal efficiency achieved was 51.42%. Further, soil organic carbon and heavy metals content negatively influence PCBs removal efficiency in the enhanced EKR processes. The findings underscore the potential enhancement of EKR technique by activation of peroxydisulfate and the surfactant Tween 80 towards solubilizing PCBs in contaminated soils.</p>

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Enhanced Electrokinetic Remediation of Polychlorinated biphenyls in Transformer Oil-Contaminated Soils: Synergistic Application of Surfactants and Oxidants for PCBs Removal

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Pradip Jadhao,
  • Ankur Khare,
  • S. Subramani,
  • Gajanan Kanade,
  • A. Ramesh Kumar

摘要

Polychlorinated biphenyls (PCBs) were used as dielectric fluids in transformers and capacitors until the 1990s due to their thermal stability, inertness, and insulating properties. PCBs pose a serious threat to human health and the environment because of their persistence, bioaccumulative, and toxic properties. Electrokinetic remediation (EKR) has been shown to be a promising technology for the remediation of PCB-contaminated soils. The efficiency of EKR-techniques can be further enhanced by using different chemical reagents. The present study explores the synergistic effects of surfactants, oxidants, and catalysts in removing PCBs from transformer oil-contaminated soils. Under the optimized conditions, using Tween 80 (3% v/v in anolyte), peroxydisulfate (10% w/v in catholyte), and CaMnO3 activator (0.625 g/L added to the cathode chamber) at an applied current of 1 DC Volt/cm for seven days, the mean PCB removal efficiency achieved was 51.42%. Further, soil organic carbon and heavy metals content negatively influence PCBs removal efficiency in the enhanced EKR processes. The findings underscore the potential enhancement of EKR technique by activation of peroxydisulfate and the surfactant Tween 80 towards solubilizing PCBs in contaminated soils.