【摘要】 复合重金属污染问题越来越被重视，探索一种更有效的减少有毒金属的方法至关重要.选择谷氨酸二乙酸四钠(GLDA)作为增强剂，强化电动(EK)修复技术用于Pb和Cu共污染土壤修复.结果表明，GLDA与EK技术相结合可有效地提高土壤中重金属的去除效率.随着GLDA浓度的升高，重金属去除效率不断升高，在20 mmol/L GLDA的作用下Pb (77.06%)和Cu (83.82%)的去除效率最高.不同条件的电动处理后，S1,S2,S3,S4,S5截面Cu可交换形态百分比由初始值(83%)分别降低到73%,46%,63%,57%,57%;电动处理后在近阴极室区域(S5)的Pb可交换形态含量在电动处理后降低到39%;GLDA中丰富的官能团使得金属离子通过离子交换、络合和电解等方式从土壤中解吸并在电场作用下迁移出土壤介质.更多还原

【Abstract】 The problem of compound heavy metal contamination is increasingly being emphasized, and it is vital to explore a more effective method of reducing toxic metals.Tetrasodium glutamate diacetate(GLDA) was selected as an enhancer to strengthen electrokinetic remediation technology for the remediation of Pb, Cu co-contaminated soil.The results showed that the combination of biosurfactant and electrokinetic technology can effectively improve the removal efficiency of heavy metals in soil.The heavy metal removal efficiency increased with increasing GLDA concentration and was highest for Pb(77.06%) and Cu(83.82%) at 20 mmol/L GLDA.The percent Cu exchangeable forms of S1,S2,S3,S4,and S5 cross sections decreased from the initial value(83%) to 73%,46%,63%,57%,and 57%,respectively, after different conditions of electrokinetic treatment; The Pb exchangeable fraction content in the near-cathode chamber region(S5) after electrokinetic treatment was reduced to 39% after electrokinetic treatment; The abundance of functional groups in GLDA allowed metal ions to be desorbed from the soil by ion exchange, complexation and electrolysis and migrated out of the soil medium under the action of an electric field.更多还原