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

YU Yulu; SIMA Jingke; YANG Jie

doi:10.13205/j.hjgc.202505025

Volume 43 Issue 5

May 2025

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YU Yulu, SIMA Jingke, YANG Jie. Electrokinetic transport characteristics and thermal activation efficiency of persulfate in low-permeability medium[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 233-241. doi: 10.13205/j.hjgc.202505025

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YU Yulu, SIMA Jingke, YANG Jie. Electrokinetic transport characteristics and thermal activation efficiency of persulfate in low-permeability medium[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 233-241. doi: 10.13205/j.hjgc.202505025

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

doi: 10.13205/j.hjgc.202505025

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

Received Date: 2024-03-14
Accepted Date: 2024-07-17
Rev Recd Date: 2024-06-17

Available Online: 2025-09-11

Abstract

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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References(31)

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