| 十二烷基苯磺酸钠强化抽出处理对地下水中1，2-二氯乙烷的去除效果 |
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| 引用本文： | 杨宾,伍斌,曹云者,李慧颖,杜晓明,李发生.十二烷基苯磺酸钠强化抽出处理对地下水中1，2-二氯乙烷的去除效果[J].环境科学研究,2016,29(10):1527-1536. |
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| 作者姓名： | 杨宾 伍斌 曹云者 李慧颖 杜晓明 李发生 |
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| 作者单位： | 1.北京师范大学水科学研究院, 北京 100875 ;中国环境科学研究院, 北京 100012 |
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| 基金项目： | 国家环境保护公益性行业科研专项(201109017) |
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| 摘 要： | 对于地下水中的1,2-DCA(1,2-dichloroethane,1,2-二氯乙烷),表面活性剂强化抽出处理是一种十分有效的修复技术.为明确表面活性剂浓度、介质粒径及抽出速率等因素对1,2-DCA修复效果的影响,选取石英砂作为多孔介质,1,2-DCA作为DNAPLs(dense nonaqueous phase liquids,重质非水相液体)代表,SDBS(sodium dodecylbenzenesulfonate,十二烷基苯磺酸钠)作为表面活性剂代表,在二维可视化砂箱中采用染色示踪结合图像分析技术对汇于凹陷弱透水层上的1,2-DCA开展SDBS强化抽出处理试验.结果表明:SDBS对1,2-DCA具有显著增溶作用.4组纯水试验的抽出液中ρ(1,2-DCA)最大值为219.15 mg/L,加入1倍CMC和3倍CMC(CMC为临界胶束浓度)的SDBS后,ρ(1,2-DCA)最大值分别升至650.95和800.44 mg/L.1,2-DCA去除总量随ρ(SDBS)的升高而增加,其中加入3倍CMC的SDBS条件下1,2-DCA的去除总量是纯水试验条件下的1.44～2.06倍.细粒径中的毛细力比粗粒径中更大,并且1,2-DCA的最大污染面积是粗粒径条件下的2.18～3.14倍,1,2-DCA与SDBS溶液接触面积的增大有利于提高SDBS对1,2-DCA的去除效果.同时增加抽出-回注流量可以扩大1,2-DCA与SDBS溶液的接触面积,提高1,2-DCA向溶液中的传质效率,进而提高1,2-DCA的去除效果.研究显示,SDBS强化抽出处理技术能够显著提高地下水中1,2-DCA的去除总量和去除效率.
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| 关 键 词： | 地下水 抽出-回注 十二烷基苯磺酸钠 1 2-二氯乙烷 图像分析 |
| 收稿时间： | 2016/4/10 0:00:00 |
| 修稿时间： | 2016/7/11 0:00:00 |
Removal of 1,2-Dichloroethane from Groundwater by Sodium Dodecyl Benzene Sulfonate-Enhanced Aquifer Remediation |
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| Affiliation: | 1.College of Water Sciences, Beijing Normal University, Beijing 100875, China ;Chinese Research Academy of Environmental Sciences, Beijing 100012, China2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China3.Beijing Municipal Research Academy of Environmental Protection, Beijing 100037, China |
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| Abstract: | Abstract: Surfactant-enhanced aquifer remediation has been proven to be effective to remediate 1,2-dichloroethanein(1,2-DCA) in aquifers. A sodium dodecyl benzene sulfonate(SDBS)-enhanced pump and treat process of 1,2-DCA which was trapped in aquitard was studied in a two-dimensional sand box to determine the impact of concentration of injected surfactant, particle size of porous media and the flow velocity aided by the dye tracer method combined with image analysis technique. Quartz sand was selected as the representative of the porous medium. 1,2-DCA was selected as the representative of DNAPLs, and SDBS was selected as the representative of surfactant. The results indicated that the solubility of 1,2-DCA could be enhanced by SDBS. The maximum solubility of 1,2-DCA was 219.15 mg/L in four traditional pump and treat experiments. The maximum solubility of 1,2-DCA increased to 650.95 mg/L and 800.44 mg/L respectively with the addition of different concentrations of SDBS. The total removal mass of 1,2-DCA was enhanced by increasing the concentrations of SDBS. The remediation efficiency of 1,2-DCA increased 1.44-2.06 times respectively with the addition of three critical micelle concentrations of SDBS. The remediation efficiency of 1,2-DCA was higher in the finer porous media because of the increased contact area between 1,2-DCA and SDBS. The maximum pollution area of 1,2-DCA in finer porous media was 2.18-3.14 times that in coarser porous media. The remediation efficiency was improved by increasing the flow rate because of the larger contact area between 1,2-DCA and SDBS. The twelve experiments indicated that the total removal and remediation efficiency of 1,2-DCA could be increased by the SDBS-enhanced aquifer remediation methods. |
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