期刊文献+

利用乙二胺四乙酸淋洗修复重金属污染的土壤及其动力学 被引量:83

Heavy metals removal and its kinetics in contaminated soil under effects of EDTA washing
下载PDF
导出
摘要 通过室内模拟试验,采用振荡淋洗的方法研究了乙二胺四乙酸(EDTA)浓度、pH、淋洗时间对重金属去除效果的影响.利用一级反应动力学模型对试验数据进行拟合,并测定了EDTA处理前后土壤中重金属形态的变化.结果表明,EDTA溶液在浓度为0.1mol.L-1、pH7、淋洗时间1d的条件下能达到对污染土壤重金属的最大去除率,去除率分别为Cd89.14%、Pb34.78%、Cu14.96%、Zn45.14%.模型拟合结果表明,Cd的质量转移系数最大,其次是Zn、Pb和Cu.说明在土壤淋洗过程中,Cd和Zn最先达到质量转移的平衡状态,然后是Pb和Cu.形态分级结果表明,EDTA能有效地去除交换态、碳酸盐结合态和氧化物结合态重金属,而对有机态和残余态部分重金属作用效果不明显. In this paper, concentrations, pH, and batch experiments were made to examine the effects of different EDTA washing duration of EDTA on the removal of heavy metals from contaminated soil. An empirical model was employed to describe the kinetics of heavy metals dissolution and desorption, and the form changes of test heavy metals were determined before and after EDTA washing. The results showed that EDTA was effective to the removal of heavy metals from contaminated soil. At 0. 1 mol·L^-1 and pH 7 of EDTA and within 24 h, the removal rate of test heavy metals was the maximum, being 89. 14% for Cd, 34. 78% for Pb, 14. 96% for Cu, and 45.14% for Zn. The mass transfer coefficient was in the order of Cd 〉 Zn 〉 Pb 〉 Cu. Sequential fractionations of treated and untreated soil samples showed that EDTA was effective in removing the exchangeable, carbonate and oxide forms of Cd, Pb, Zn and Cu, but ineffective for the organic and residual forms of test heavy metals.
出处 《应用生态学报》 CAS CSCD 北大核心 2007年第3期601-606,共6页 Chinese Journal of Applied Ecology
基金 国家重点基础研究发展规划项目(2004CB418506) 国家自然科学基金重点项目(20337010) 国家自然科学基金资助项目(20277040).
关键词 重金属 土壤污染 淋洗 乙二胺四乙酸 形态 heavy metal soil pollution washing EDTA form.
  • 相关文献

参考文献28

  • 1Abumaizar R,Khan LI.1996.Laboratory investigation of heavy metal removal by soil washing.Journal of the Air and Waste Management Association,46:765-768
  • 2Alam MGM,Tokunaga S,Maekawa T.2001.Extraction of arsenic in a synthetic arsenic-contaminated soil using phosphate.Chemosphere,43:1035-1041
  • 3Bourg ACM.1995.Speciation of Heavy metals in soils and groundwater and implications for their natural and provoked mobility// Salomons W,Forstner U,Mader P,eds.Heavy Metals Problems and Solutions.Berlin:Springer-Verlag:19-32
  • 4Cline SR,Reed BR.1995.Lead removal from soils via bench-scale soil washing techniques.Journal of Environmental Engineering,121(10):700-705
  • 5Davis AP,Singh I.1995.Washing of zinc (Ⅱ) from contaminated soil column.Journal of Environment Engineering,121(2):174-185
  • 6Garrabrants AC,Kosson DS.2000.Use of a chelating agent to determine the metal availability for leaching from soils and wastes.Waste Management,20:155-165
  • 7Griffiths RA.1995.Soil-washing technology and practice.Journal of Hazardous Materials,40:175-189
  • 8Hong KJ,Tokunaga S,Kajiuchi T.2002.Evaluation of remediation process with plant-derived biosurfactant for recovery of heavy metals from contaminated soils.Chemosphere,49:379-387
  • 9Hossner LR.1996.Dissolution for total elemental analysis// Sparks DL,ed.Methods of Soil Analysis,Part 3:Chemical Methods.Wisconsin:SSSA and ASA,Madison:49-64
  • 10Kim CS,Ong SK.2000.Effects of amorphous iron on extraction of lead-contaminated soil with EDTA.ASCE Hazardous,Toxic and Radioactive Waste Management Practice Periodical,4:16-23

同被引文献1121

引证文献83

二级引证文献755

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部