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

发布时间：2018-01-18 05:27

本文关键词：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　出处：《环境科学研究》2016年10期 　论文类型：期刊论文

【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.
[Abstract]:For 1 ~ (2) DCA ~ (1) ~ (2) dichloroethanean (1 ~ (2) -dichloroethane in groundwater). Surface active agent enhanced extraction treatment is a very effective remediation technique, in order to determine the concentration of surfactant, medium particle size and extraction rate and other factors on the remediation effect of 1n2-DCA. The quartz sand is chosen as the porous medium (1 + 2-DCA) as the representative of DNAPLs(dense nonaqueous phase liquid (heavy non-aqueous phase liquid). SDBS(sodium dodecyl benzenesulfonate (12 sodium alkylbenzene sulfonate) was used as surfactant. In the two-dimensional visualization sand box, dyeing tracer combined with image analysis technique was used to carry out the SDBS enhanced extraction treatment experiment on the weak permeable layer of the sag. The results showed that 1% SDBs was used for the treatment of 1 in the weak permeable layer of the sag. 2-DCA has a significant solubilization effect. The maximum value of 蟻 ~ (1 +) ~ (2-DCA) in the extract of pure water test in group 4 is 219.15 mg/L. After the addition of 1 CMC and 3 times CMC(CMC as the critical micelle concentration, the maximum value of 蟻 ~ (1 +) -DCA increased to 650.95 mg/L.1 and 800.44 mg/L.1, respectively. The total removal amount of 2-DCA increased with the increase of 蟻 SDBs, including the addition of 3 times CMC to SDBS. The total removal amount of 2-DCA is 1.44 ~ 2.06 times of that of pure water. The capillary force of fine particle is larger than that of coarse particle, and 1. The maximum polluted area of 2-DCA is 2.18 ~ 3.14 times that of SDBS solution under the condition of coarse particle size. The increase of contact area between 2-DCA and SDBS solution is beneficial to the improvement of SDBS pair 1. The removal effect of 2-DCA. At the same time, increasing the flow-rate of pull-back injection can enlarge the contact area between 1C _ 2-DCA and SDBS solution, and improve the mass transfer efficiency of 1C _ 2-DCA into the solution. The results show that SDBS enhanced extraction treatment technology can significantly increase the total removal amount and removal efficiency of 1C _ 2-DCA in groundwater.
【作者单位】：北京师范大学水科学研究院;中国环境科学研究院;北京市环境科学研究院;
【基金】：国家环境保护公益性行业科研专项(201109017)
【分类号】：X523
【正文快照】： 随着城市化进程和国家“退二进三”政策的实施,工业场地中遗留或泄露了大量污染物质,对场地内土壤和地下水造成了严重污染[1].1,2-DCA(1,2-dichloroethane,1,2-二氯乙烷)是其中一类重要的污染物质,属于DNAPLs(dense nonaqueousphase liquids,重质非水相液体)[2].由于DNAPLs不

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