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| Rapid electrokinetic reduction remediation of cadmium-contaminated farmland soil |
| Received:February 14, 2025 |
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| KeyWord:cadmium;activation;electrokinetic;adsorption;reduction remediation |
| Author Name | Affiliation | E-mail | | FENG Junlin | Power China Kunming Engineering Corporation Limited, Kunming 650032, China | | | WANG Chenfeng | State Key Laboratory of Soil & Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | | | LIU Sheng | Power China Kunming Engineering Corporation Limited, Kunming 650032, China | | | ZHANG Yanchun | Power China Kunming Engineering Corporation Limited, Kunming 650032, China | | | CANG Long | State Key Laboratory of Soil & Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | canglong@issas.ac.cn |
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| Abstract: |
| A rapid electrokinetic reduction remediation（RERR）technology was developed to remediate cadmium-contaminated farmland soil by integrating chemical activation, electrokinetic migration, and adsorptive removal. Through electrokinetic column experiments, the changes in soil pH, Cd contents and chemical fractions were analyzed, and the migration and removal mechanisms of soil Cd were systematically investigated. The study revealed citric acid activation enhanced current density while reducing pore water pH and increasing the cadmium concentration in soil pore water. The cadmium content in different soil sections exhibited a gradual increase from anode to cathode, suggesting that cadmium migrated towards the cathode under direct-current electric field. Implementation of a cation exchange resin adsorption layer at the cathode effectively minimized cadmium accumulation and buffered soil pH elevation near the cathode. The technology demonstrated significant remediation efficiency, achieving 77.1% total cadmium removal at 1 V·cm-1 within 7 days, which further improved to 90.8% under 1.5 V·cm-1 through enhanced eletromigration kinetics. The results of BCR chemical fraction of soil cadmium indicated that the RERR technology could reduce the cadmium content of weak extraction fraction, reducible fraction and oxidizable fraction post-remediation. |
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