Direct current electric field enhanced reverse transport of persulfate and iron-based sustained-release system for synergistic remediation of chlorophenol-contaminated soil

doi:10.3969/j.issn.1000-1565.2025.05.004

Abstract

Abstract: To address the critical challenges of limited persulfate(PDS)diffusion and insufficient sustained supply of ferrous ions(Fe²⁺)during the remediation of low-permeability organic contaminated soils, this study developed a synergistic activation system based on a direct current(DC)electric field. By implementing a novel counter-directional delivery strategy-cathodic injection of PDS oxidant and anodic release of a ［Fe(Ⅱ)(C₆H₅O₇)］^- complex-the spatially oriented migration and dynamic coupling of redox-active components(PDS and Fe²⁺)were achieved, leading to substantial improvements in both transport efficiency and spatial homogeneity of reactive species. Following two-stage electrokinetic remediation, the- DOI:10.3969/j.issn.1000-1565.2025.05.004直流电场强化过硫酸盐与铁基缓释体系逆向输运协同修复氯代酚污染土壤杨旻昊¹,牟桉永²,赵冬梅³,徐宇程¹,任更波¹,马小东¹(1.河北工业大学能源与环境工程学院,天津 300401;2. 中国石油大港油田公司质量健康安全环保部,天津 300280;3. 大港油田原油运销公司,天津 300280)摘要:针对低渗透性有机污染土壤修复过程中过硫酸盐(peroxydisulfate,PDS)扩散受限和亚铁离子(Fe²⁺)持续供应不足的技术瓶颈,构建了基于直流电场的逆向传输协同活化体系.通过阴极注入PDS氧化剂与阳极释放［Fe(Ⅱ)(C₆H₅O₇)］^-络合物的策略,实现了氧化-还原活性组分的空间定向迁移与动态匹配,显著提升了反应物质的迁移效能和空间分布均匀性,经二次修复后,目标污染物二氯酚的降解率提升至90.08%,土壤残留污染物质量分数(88.6 mg/kg)显著低于《土壤环境质量建设用地土壤污染风险管控标准(试行)》(GB36600—2018)中第一类建设用地风险管控阈值(117 mg/kg).本研究提出的电化学逆向传质调控策略为有机污染土壤修复提供了新的技术路径,特别是在解决低渗透地层氧化剂传输与活化剂持续供给的协同优化方面具有重要应用价值.关键词:过硫酸盐;直流电;传质;二氯酚;土壤修复中图分类号:X53 文献标志码:A 文章编号:1000-1565(2025)05-0476-12Direct current electric field enhanced reverse transport of persulfate and iron-based sustained-release system for synergistic remediation of chlorophenol-contaminated soilYANG Minhao¹, MU Anyong², ZHAO Dongmei³, XU Yucheng¹, REN Gengbo¹, MA Xiaodong¹(1. School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Department of Quality, Health, Safety and Environmental Protection, PetroChina Dagang Oilfield Co., Tianjin 300280, China; 3. Crude Oil Distribution Company of Dagang Oilfield, Tianjin 300280, China)Abstract: To address the critical challenges of limited persulfate(PDS)diffusion and insufficient sustained supply of ferrous ions(Fe²⁺)during the remediation of low-permeability organic contaminated soils, this study developed a synergistic activation system based on a direct current(DC)electric field. By implementing a novel counter-directional delivery strategy-cathodic injection of PDS oxidant and anodic release of a ［Fe(Ⅱ)(C₆H₅O₇)］^- complex-the spatially oriented migration and dynamic coupling of redox-active components(PDS and Fe²⁺)were achieved, leading to substantial improvements in both transport efficiency and spatial homogeneity of reactive species. Following two-stage electrokinetic remediation, the- 收稿日期:2024-11-10;修回日期:2025-03-25 基金项目:国家重点研发计划项目(2020YFC1808603);国家自然科学基金项目(21876042);河北省重点研发计划项目(22374206D) 第一作者:杨旻昊(2001—),男,河北工业大学在读硕士研究生,主要从事有机污染土壤修复方向研究.E-mail:202331305015@stu.hebut.edu.cn 通信作者:马小东(1972—),男,河北工业大学教授,主要从事工业污染场地修复方向研究. E-mail:maxd@hebut.edu.cn第5期杨旻昊等:直流电场强化过硫酸盐与铁基缓释体系逆向输运协同修复氯代酚污染土壤河北大学学报(自然科学版) 第45卷degradation efficiency of dichlorophenol reached 90.08%, with residual concentrations(88.6 mg/kg)significantly below the risk control threshold(117 mg/kg)specified for Category I construction land in China’s Soil Environmental Quality Standard(GB36600—2018). The proposed electrochemically regulated counter-directional mass transfer strategy establishes a robust technical framework for organic soil remediation, particularly in overcoming the synergistic challenges of oxidant delivery and activator replenishment in low-permeability strata.

Key words: persulfate, direct current, mass transfer, dichlorophenol, soil remediation

CLC Number:

YANG Minhao, MU Anyong, ZHAO Dongmei, XU Yucheng, REN Gengbo, MA Xiaodong. Direct current electric field enhanced reverse transport of persulfate and iron-based sustained-release system for synergistic remediation of chlorophenol-contaminated soil[J]. Journal of Hebei University(Natural Science Edition), 2025, 45(5): 476-487.

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