过硫酸盐在低渗介质中的电动运输特性和热活化效率

俞钰露; 司马菁珂; 杨洁

doi:10.13205/j.hjgc.202505025

过硫酸盐在低渗介质中的电动运输特性和热活化效率

doi: 10.13205/j.hjgc.202505025

俞钰露^1,2,
司马菁珂^1,2, ,,
杨洁^1,2

1. 上海市环境科学研究院, 上海 200233;
2. 国家环境保护城市土壤污染控制与修复工程技术中心, 上海 200233

基金项目:

国家重点研发计划“原位热脱附-蒸汽强化抽提耦合修复技术与装备研发”（2019YFC1805702）；上海市环境科学研究院青年科技创新基金资助项目“低渗透氯代有机污染场地电热耦合过硫酸盐修复技术研究”（CX2021140332）

详细信息

作者简介:
俞钰露（1995—），女，助理研究员，主要研究方向为土壤污染防治。yuyl@saes.sh.cn

通讯作者:
司马菁珂（1987—），女，高级工程师，主要研究方向为土壤污染防治。jingkesima@hotmail.com

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出版历程
- 收稿日期: 2024-03-14
- 录用日期: 2024-07-17
- 修回日期: 2024-06-17
- 网络出版日期: 2025-09-11

Electrokinetic transport characteristics and thermal activation efficiency of persulfate in low-permeability medium

YU Yulu^1,2,
SIMA Jingke^{1,2
, ,},
YANG Jie^1,2

1. Shanghai Academy of Environmental Sciences, Shanghai 200233, China;
2. State Environmental Protection Engineering Center for Urban Soil Contamination Control and Remediation, Shanghai 200233, China

摘要

摘要: 电动运输与热活化过硫酸盐氧化技术耦合是一种有效处理低渗透有机污染土壤的修复技术。氧化剂在介质中的迁移过程和热活化效率，是提高该技术修复效率的关键依据。研究了直流电场下过硫酸盐在低渗透性介质中的迁移行为以及交流电场下过硫酸盐的热活化情况。结果表明，采用“阳极投加”比“阴极投加”更能促进过硫酸盐的迁移；提高电压梯度可以显著提高电流强度和电渗速度，但电渗系数基本不变；电压梯度为1 V/cm时，S₂O₈^2-在24 h达到最大迁移距离（25.0 cm），最远处平均浓度为投加量的5.70%；电压梯度为2 V/cm时，S₂O₈^2-仅在阳极（3.0 cm）附近富集，平均浓度达到投加量的15倍；施加不同强度的交流电场，电场强度越高，介质升温效果越好，且中部的升温效果较靠近电极两侧更好；过硫酸盐的热活化率随介质温度的升高而变大。该研究体系下，采用较低强度的直流电（1 V/cm）及较高强度的交流电（3 V/cm），能使过硫酸盐有最佳的迁移扩散效果（25.0 cm）和热活化效率（32.0%~74.1%）。
- 电动运输 /
- 过硫酸盐 /
- 迁移 /
- 热活化 /
- 低渗透介质
Abstract: Electrokinetic remediation combined with thermal activated persulfate oxidation is an effective remediation technology for most organic contaminations in low-permeability soil. The key to improving its repaire efficiency lies in enhancing the migration， mass transfer， and thermal activation efficiency of the oxidants in low-permeability medium. In this paper， the migration behavior of persulfate in low-permeability medium under direct current （DC） and the thermal activation of persulfate under alternating current （AC） were studied， respectively. The results showed that adopting "anode dosing" was more conducive to the migration of persulfate than adopting "cathode dosing". The current intensity and electroosmotic velocity of the reaction system were significantly improved by increasing DC voltage gradient. However， the electroosmotic coefficient was basically unchanged because it was primarily related to the basic properties of the medium and was not affected by experimental conditions. When the DC voltage gradient was set to 1 V/cm， the persulfate ion reached its maximum migration distance at 24 h. The maximum migration distance was 25.0 cm and the average concentration at the furthest distance was 5.70% of the initial dosing concentration. When the DC voltage gradient was set to 2 V/cm， persulfate ions were almost unable to migrate instead and only accumulated at S1 point， which was 3.0 cm away from the anode. Under these condition， the average concentration of persulfate ions at S1 point reached 15 times the initial dosing concentration. In addition， it was found that the higher the AC voltage gradient， the better the heating effect of the medium when applying AC electric field with different intensities. The heating effect of the middle part of the medium was better than that on both sides of the electrode， indicating that the temperature in the middle was higher than that on both sides. The thermal activation efficiency of persulfate increased correspondingly with the increase of medium temperature. Therefore， the higher the AC voltage gradient， the higher the thermal activation efficiency of persulfate. Within the framework of this research， setting the DC voltage to a lower intensity of 1 V/cm and the AC voltage to a higher intensity of 3 V/cm resulted in the best migration effect of persulfate. Under this optimal condition， the maximum migration and diffusion distance reached 25.0 cm， and the thermal activation efficiency of persulfate ranged from 32.0% to 74.1%.
- electrokinetic transport /
- persulfate /
- migration /
- thermal activation /
- low-permeability medium

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参考文献(31)

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