| 生物可降解螯合剂GLDA强化电动修复Cd污染土壤研究 |
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| 引用本文： | 秦丰林.生物可降解螯合剂GLDA强化电动修复Cd污染土壤研究[J].现代农业科技,2021(12). |
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| 作者姓名： | 秦丰林 |
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| 作者单位： | 南京迪天高新产业技术研究院有限公司 |
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| 摘 要： | 本研究以环境友好的新型螯合剂GLDA作为增强剂,对Cd污染土壤开展电动修复实验。与对照组相比,三个处理组土壤pH均显著降低,土壤EC均显著增加。增强组体系电流高于常规组,两组体系电渗流、柠檬酸消耗量及电耗均与修复时长成正相关关系,其中增强组电渗流拟合速度接近常规组的3倍,柠檬酸消耗拟合速度也高于常规组,但两者电耗并无显著差异。电动修复过程中产生的废液,经加碱、破络、混沉等工艺处置后,可达标排放。本研究结果表明,Cd污染土壤强化电动修复技术可行,GLDA强化可将土壤Cd去除率由75.92%提升至95.29%,修复后土壤Cd含量远低于我国GB 36600-2018规定的第一类用地管制值,且不会大幅增加治理成本,在场地修复中易于推广。
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| 关 键 词： | 电动修复 增强剂 螯合剂 GLDA 生物可降解 柠檬酸 |
| 收稿时间： | 2020/12/14 0:00:00 |
| 修稿时间： | 2020/12/14 0:00:00 |
Study on Electrokinetic Remediation of Cadmium Contaminated Soil Enhanced By Biodegradable Chelating Agent GLDA |
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| Abstract: | A new environmental friendly chelating agent GLDA was used in this study as the enhancing agent of electrokinetic remediation experiment on cadmium contaminated soil. Compared with the control, the soil pH of the three treatments decreased significantly, while the soil EC increased significantly. The systematic current of the enhancing treatment was higher than that of the routine treatment. The electroosmotic flow of the two treatments, as well as the citric acid consumption and electricity consumption, is positively correlated with the remediation time, wherein the electroosmotic flow fitting speed of the enhancing treatment was about 3 times that of the routine treatment, and its citric acid consumption was also higher, but there was no significant difference in electricity consumption between two treatments. The waste liquid produced can be discharged up to standard after disposal by adding alkali, breaking complexation, coagulating sedimentation, etc. The result of this study shows that GLDA-enhanced electrokinetic remediation technology is feasible and easy to popularize in remediation of cadmium contaminated sites, with a significant increase of soil cadmium removal rate from 75.92% to 95.29%. The cadmium content of the soil after remediation is far lower than the control value of type-I land specified in GB 36600-2018 (China), and the remediation cost is not significantly increased. |
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| Keywords: | electrokinetic remediation enhancing agent chelating agent GLDA biodegradable citric acid |
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