Abstract
A modified electrokinetic remediation (EKR) system was designed to remediate Cr-contaminated soil by using iron-treated activated carbon (AC) as the third electrode. Controlled and orthogonal experiments were conducted with aim of evaluating effect of various factors on Cr removal in this modified system. The results revealed that remediation time was most influential on removal capacity of the three-dimensional (3D) electrode EKR system. The existence of particle electrodes buffered soil pH and the average removal efficiency of Cr(VI) was enhanced to 50.09% after 5 days compared with 42.49% by conventional EKR. Noticeably, the removal rate of Cr(VI) was enhanced to 86.46% after 10 days remediation at particle electrode of 2 mm. Besides, it was found that 3D electrode EKR system were effective to carbonates and exchangeable fraction of Cr by reducing/converting Cr(VI) to Cr(III) or more stable compounds. In addition to prevailing electromigration, the main removal mechanism in modified EKR system was adsorption/electrosorption of third electrode and substantial conduction of Cr(VI) in soil.
| Original language | English |
|---|---|
| Pages (from-to) | 15-23 |
| Number of pages | 9 |
| Journal | Journal of the Taiwan Institute of Chemical Engineers |
| Volume | 101 |
| DOIs | |
| Publication status | Published - 1 Aug 2019 |
| Externally published | Yes |
Funding
Yujie Yan gratefully thanks the China Scholarship Council for the grant (CSC201806050044) for her stay at the Technical University of Denmark.
Keywords
- Chromium-contaminated soil
- Electrokinetic remediation
- Orthogonal experiment
- Third electrode
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