| 摘要: |
| 【目的】研究不同条件下螯合剂乙二胺四乙酸二钠盐（EDTA）、柠檬酸(CIT)和阴离子表面活性剂十二烷基硫酸钠（SDS）、生物表面活性剂鼠李糖脂（RL2)对污染土娄土中铜、铅的淋洗效果，并对淋洗机制进行探讨。【方法】以铜、铅单一污染的土娄土为研究对象，分别加入2种螯合剂（EDTA、CIT）和2种表面活性剂（SDS、RL2），采用批次试验方法，分析淋洗剂浓度、pH、背景电解质(NaNO3和NaCl )、水(mL)土(g)比、淋洗次数对污染土娄土中Cu和 Pb的淋洗百分率的影响，探索不同淋洗剂淋洗污染土娄土中Cu和 Pb的最佳条件。【结果】在相同浓度下，EDTA和CIT对污染土娄土中Cu的淋洗百分率明显高于其他淋洗剂，EDTA对Pb的淋洗百分率明显高于其他淋洗剂。淋洗4次后，4种淋洗剂对污染土娄土中Cu的淋洗能力由大到小为CIT＞EDTA＞RL2＞SDS，对污染土娄土中Pb的淋洗能力为EDTA＞RL2＞CIT＞SDS。EDTA和CIT溶液淋洗土娄土中Cu和 Pb的最适条件为：水土比 20(mL)∶1(g)、淋洗剂浓度 0.01 mol/L、pH=7、无背景电解质；当水土比为20(mL)∶1(g)、RL2溶液浓度为 0.02 mol/L、pH=8、无背景电解质条件下，RL2对污染土娄土中Cu、Pb的淋洗效果最佳。【结论】EDTA、CIT和RL2可以有效去除污染土娄土中的Cu，EDTA可作为石灰性污染土娄土中Pb的最佳淋洗剂，而SDS不宜作为污染性土壤的淋洗剂。 |
| 关键词: 螯合剂 表面活性剂 铜 铅 土娄土 淋洗修复 |
| DOI： |
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| 基金项目:陕西省科技攻关计划项目（2014K02-12-02） |
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| Leaching remediation of copper and lead in contaminated Lou soil using different eluents |
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DENG Hong-xia,LIU Xia,WANG Jian-tao,et al
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| Abstract: |
| 【Objective】The purpose of this paper was to study the effects of ethylenedinitrilo-tetraacetic acid disodium salt (EDTA),citric acid (CIT),sodium dodecyl sulfate (SDS) and rhamnolipid (RL2) under different conditions on the leaching remediation of Cu and Pb contaminated Lou soil,and to analyze the leaching mechanisms.【Method】Two chelating agents (ethylenedinitrilo-tetraacetic acid disodium salt (EDTA) and citric acid (CIT)) and two surfactants (Sodium dodecyl sulfate (SDS) and rhamnolipid (RL2)) were added in single Cu or Pb contaminated Lou soil to study the effects of concentration,pH,background electrolytes (NaNO3 and NaCl),ratio of water to soil,and leaching times on removal rates of Cu and Pb from Lou soil using batch desorption tests.The optimal conditions of different eluents in leaching Cu and Pb from contaminated Lou soil were chosen as well.【Result】Under same concentration,leaching rates of Cu using EDTA and CIT were higher than other eluents and leaching rates of Pb using EDTA were higher than other eluents.After 4 times leaching,the leaching rates of Cu in contaminated Lou soil were in a decreasing order of CIT＞EDTA＞RL2＞SDS,and the leaching rates of Pb were in a decreasing order of EDTA＞RL2＞CIT＞SDS.The optimal conditions of EDTA and CIT solutions were:water to soil ratio 20∶1,eluents concentration 0.01 mol/L,pH 7,and no background electrolyte.The best leaching rates of Cu and Pb was obtained using RL2 with concentration of 0.02 mol/L,pH of 8,and without background electrolyte.【Conclusion】EDTA,CIT and RL2 could effectively remove Cu from contaminated Lou soil while EDTA was effective to remove Pb.SDS could not be used as leaching agent for leaching remediation of Lou soil. |
| Key words: chelating agent surfactant copper lead Lou soil leaching remediation |
