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Position: Home > Articles > Basic Study on EDDS-enhanced Electrokinetic Remediation of Cu/Zn Contaminated Soil Journal of Agro-Environment Science 2007,26 (02) 38-44

EDDS应用于Cu/Zn污染土壤电动处理的基础研究

作  者:
吴丹亚;仓龙;周东美;司友斌
单  位:
安徽农业大学资源与环境学院;安徽合肥230036土壤与农业可持续发展国家重点实验室;中国科学院南京土壤研究所;土壤与农业可持续发展国家重点实验室;土壤与农业可持续发展国家重点实验室 中国科学院南京土壤研究所
关键词:
铜;锌;EDDS;电动处理;污染土壤
摘  要:
重金属污染土壤的修复是当前的热点研究课题。通过研究可降解有机络合剂EDDS对铜矿区Cu/Zn污染土壤中Cu和Zn最适的浸提时间和浸提液的pH范围,并在此基础上初步研究了将EDDS应用于该污染土壤的电动处理过程。结果表明,24h浸提时间和pH5~8的EDDS浸提液可对污染土壤Cu和Zn的浸提率分别达到25%和10%以上;电动处理过程中用EDDS预先饱和土壤有利于Cu和Zn的溶解,但由于电渗流方向与EDDS及其络合物的迁移方向相反从而不利于EDDS络合物从土柱中的移出;同时较低用量的EDDS对土壤Cu和Zn的电动去除效果不明显。可见,诸多因素影响着EDDS在Cu/Zn污染土壤电动修复中的应用。
译  名:
Basic Study on EDDS-enhanced Electrokinetic Remediation of Cu/Zn Contaminated Soil
作  者:
WU Dan-ya1,2, CANG Long2, ZHOU Dong-mei1, SI You-bin2 (1. Anhui Agricultural University, Hefei 230036, China; 2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China)
关键词:
copper; zinc; EDDS; electrokinetic remediation; Cu/Zn contaminated soil
摘  要:
Experiments were carried out to investigate the effects of biodegradable EDDS on extraction and electrokinetic removal of Cu/Zn from a Cu/Zn contaminated soil. The results showed that the extraction ratio was 70% of the total in pH 5~8 EDDS solution after shaking for 24 h. As enhancing reagent, EDDS is more beneficial for the electrokinetic treatment than NaCl solution. But electroosmotic flow moved towards the cathode, which was disadvantageous for the Cu/Zn removal from soil column. No significant effect of EDDS on the electrokinetic treatment was observed when EDDS was applied at the rate of 1.6 mmol·kg-1 soil. Overall, many complex factors affected the EDDS-enhanced electrokinetic remediation.

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