| 冯峻林,王陈峰,刘胜,张燕春,仓龙.镉污染农田土壤的快速电动减量化修复研究[J].农业环境科学学报,2026,45(3):655-663. |
| 镉污染农田土壤的快速电动减量化修复研究 |
| Rapid electrokinetic reduction remediation of cadmium-contaminated farmland soil |
| 投稿时间：2025-02-14 |
| DOI：10.11654/jaes.2025-0129 |
| 中文关键词: 镉 活化 电动 吸附 减量化修复 |
| 英文关键词: cadmium activation electrokinetic adsorption reduction remediation |
| 基金项目:中国电建集团核心攻关项目（DJ-HXGG-2023-06）；国家自然科学基金项目（42177032）；科技人才与平台计划项目（202305AK34003） |
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| 中文摘要: |
| 以镉污染农田土壤为修复对象，构建了“化学活化-电动迁移-吸附移除”的快速电动减量化修复技术，通过电动土柱试验，分析了土壤pH、镉含量和化学形态的变化，系统探究了该技术对土壤镉的迁移和去除机制。结果表明：活化剂柠檬酸的加入提高了体系电流，降低了土壤孔隙水pH，提高了土壤孔隙水中镉的浓度；土壤镉含量呈现从阳极向阴极逐渐增加的趋势，显示土壤镉在电场作用下向阴极迁移；在阴极设置阳离子交换树脂吸附层，有利于减少土壤镉在阴极的积聚，同时缓和了阴极附近土壤pH的升高；在1 V·cm-1电压梯度下7 d内土壤总镉去除率达77.1%，进一步提高至1.5 V·cm-1可获得90.8%的土壤总镉去除率；土壤镉的BCR化学形态分级表明，本技术可快速降低弱酸可提取态、可还原态和可氧化态的镉形态含量。 |
| 英文摘要: |
| 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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