| 铬-菲复合污染土壤的电动修复效果 |
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| 引用本文： | 杜玮,张光生,邹华,朱荣.铬-菲复合污染土壤的电动修复效果[J].环境科学研究,2016,29(8):1163-1169. |
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| 作者姓名： | 杜玮 张光生 邹华 朱荣 |
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| 作者单位： | 1.江南大学环境与土木工程学院, 江苏 无锡 214122 ;江苏省水处理技术与材料协同创新中心, 江苏 苏州 215009 |
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| 基金项目： | 国家水体污染控制与治理科技重大专项(2012ZX07503-002) |
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| 摘 要： | 为了解决常规电动修复方法对土壤重金属-有机物复合污染去除效率低的问题,采用向电解液中添加表面活性剂以及控制阴极电解液为酸性的电动强化修复技术,以Cr和菲为代表性污染物,研究电压和表面活性剂〔TritonX-100(曲拉通100)、SDBS(十二烷基苯磺酸钠)〕以及阴极电解液pH对修复效果的影响. 结果表明:Cr(Ⅵ)以阴离子团形式呈现向阳极迁移的趋势,菲呈现向阴极迁移的趋势；随着施加电压的升高,污染物去除率也会相应提高,当电压梯度升至1.0 V/cm时,Cr(T)、Cr(Ⅵ)、菲的去除率分别达到34.3%、76.9%、12.7%. 在电压梯度为1 V/cm的条件下,控制阴极电解液pH为4.00时,Cr(T)、Cr(Ⅵ)、菲的去除率分别升至45.1%、84.8%、23.1%；向电解液中添加表面活性剂后能提高污染物的去除率,其中,添加SDBS能够将Cr-菲复合污染土壤中Cr(T)、Cr(Ⅵ)的去除率由34.3%、76.9%升至39.9%、82.0%,添加TritonX-100能够将有机物菲的去除率由12.7%升至27.0%. 研究显示,修复处理后污染物浓度均有不同程度的降低,充分表明电动处理时提高修复电压、添加表面活性剂以及控制阴极电解液的酸碱性可以明显促进污染物在土壤中的迁移.
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| 关 键 词： | 电动修复 复合污染 Cr 菲 表面活性剂 |
| 收稿时间： | 2015/12/22 0:00:00 |
| 修稿时间： | 2016/4/18 0:00:00 |
Electrokinetic Remediation of Chromium-Phenanthrene Combined Contaminated Soils |
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| DU Wei,ZHANG Guangsheng,ZOU Hua and ZHU Rong.Electrokinetic Remediation of Chromium-Phenanthrene Combined Contaminated Soils[J].Research of Environmental Sciences,2016,29(8):1163-1169. |
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| Authors: | DU Wei ZHANG Guangsheng ZOU Hua and ZHU Rong |
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| Affiliation: | 1.School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China ;Jiangsu Collaborative Innovation Center of Technology and Material for Water Treatment, Suzhou 215009, China2.School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China |
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| Abstract: | Surfactant and control of cathode electrolyte pH were proposed to solve the problem of low efficiency in the conventional electrokinetic method for combined contaminated soils. Electrokinetic (EK) remediation has received much attention as a practical in-situ and ex-situ remediation to remove heavy metals and organic compounds simultaneously. Chromium and phenanthrene were selected to simulate typical compound pollutants at a concentration of 500 mg/kg. The impact of remediating voltage, anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and nonionic surfactant TrironX-100, as well as control of cathode electrolyte pH were studied. The repair time for all the tests was 15 days. Distribution, migration characteristics and mechanism of chromium and phenanthrene were analyzed as well. In all the tests, phenanthrene had the trend of migrating towards the cathode; in contrast, chromium had the trend of migrating towards the anode. The removal efficiency increased with the increasing treatment voltage. When the voltage up to 1 V/cm, Cr(T), Cr(Ⅵ), phenanthrene removal rate reached 34.3%, 76.9%, 12.7%, respectively. Under the condition of voltage of 1 V/cm, the control of cathode electrolyte pH at 4.00 was efficient for the desorption and migration of contaminants, and the removal rates of Cr(T), Cr(Ⅵ) and phenanthrene were raised from 34.3%, 76.9% and 12.7% to 45.1%, 84.8% and 23.1%, respectively. Surfactant solutions (TritonX-100 and SDBS, respectively), at 20 times critical micelle concentration (CMC), were respectively poured into both the anode and cathode reservoirs of the EK system. The use of SDBS was found to be effective for the removal of heavy metals, and the removal rates of Cr(T) and Cr(Ⅵ) reached 39.9% and 82.0%, respectively. The results showed that the concentration of TritonX-100 above CMC enhanced solubility of phenanthrene to a great extent, and the removal rate of phenanthrene reached 27.0%. |
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| Keywords: | electrokinetic remediation compound pollution chromium phenanthrene surfactant |
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