表面活性剂强化空气扰动修复氯苯污染含水层

秦传玉; 赵勇胜; 郑苇

doi:10.3799/dqkx.2011.077

表面活性剂强化空气扰动修复氯苯污染含水层

doi: 10.3799/dqkx.2011.077

1.
长春理工大学化学与环境工程学院，吉林长春 130022
2.
吉林大学环境与资源学院，吉林长春 130026

基金项目:

国家高技术研究发展“863”计划项目 2008AA06A410

详细信息

作者简介:
秦传玉(1981-)，男，讲师，主要从事水土环境污染控制与治理研究

通讯作者:
赵勇胜，E-mail：zhaoyongsheng@jlu.edu.cn

中图分类号: X13
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出版历程
- 收稿日期: 2010-10-15
- 刊出日期: 2011-07-01

Remediation of Chlorobenzene Polluted Aquifer by Surfactant-Enhanced Air Sparging

1.
School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun 130022, China
2.
College of Environment and Resources, Jilin University, Changchun 130026, China

摘要

摘要: 通过一维砂柱实验研究了阴离子表面活性剂十二烷基苯磺酸钠(SDBS)对空气扰动技术(air sparging，AS)修复氯苯污染地下水的强化效果.结果表明，SDBS的加入降低了地下水的表面张力，减小了水气两相毛细压力，从而提高了地下水中的空气饱和度.当曝气量为100 mL/min，地下水的表面张力由72.2 mN/m降至49.5 mN/m时，地下水中空气饱和度由13.2%提高至50.1%，而后随着表面张力的进一步降低，空气饱和度不再提高，反而有小幅下降.通过污染物的去除实验发现，SDBS的加入大大提高了氯苯的去除率，且去除率的变化与空气饱和度的变化趋势基本相符.因此，表面活性剂的加入可以作为空气扰动技术一种十分有效的强化手段.
- 表面活性剂强化 /
- 空气扰动 /
- 污染控制 /
- 空气饱和度 /
- 环境工程
Abstract: The strengthening effect of anionic surfactant sodium dodecyl benzene sulfonate (SDBS) on air sparging (AS) was investigated using a series of one-dimensional column experiments. The results show that the addition of SDBS into groundwater lowered the groundwater surface tension, which in turn reduced the air entry capillary pressure. As a result, the air saturation in groundwater was increased accordingly. At the air injection rate of 100 mL/min, the surface tension reduction from 72.2 mN/m to 49.5 mN/m led to air saturation enhancement from 13.2% to 50.1%. As the surface tension further decreased, the air saturation no longer increased, but slightly reduced instead. Through the contaminant removal experiment, it was found that the addition of SDBS greatly increased the chlorobenzene removal efficiency, and the change trend of removal efficiency was almost the same to the change of air saturation. Thus, the addition of surfactant into groundwater can be an effective method to enhance air sparging.
- surfactant-enhanced /
- air sparging /
- pollution control /
- air saturation /
- environmental engineering

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图 1 实验装置

a.待进溶液；b.活性炭管；c.气体取样孔；d.柱体；e.取样孔；f.流量计；g.曝气泵

Fig. 1. Experimental setup

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图 2 中砂中水气两相S_w-h_c关系

Fig. 2. Water retention curves in medium sand

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图 3 不同曝气量和SDBS浓度下空气饱和度的变化情况

Fig. 3. Air saturation at different air flow rates and SDBS concentration

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图 4 不同表面张力下介质中孔道分布示意

Fig. 4. A schematic diagram of channel distribution in medium sand at different surface tension

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图 5 不同表面张力下氯苯的去除情况

Fig. 5. Chlorobenzene removal vs. time at different surface tension

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表 1 实验用砂理化性质

Table 1. Properties of sands used in experiment

	粒径(mm)	pH	TOC (%)	渗透系数(m/s)	孔隙度	堆积密度(g/cm³)
中砂	0.25~0.5	6.96	0.1	4.8×10^-4	0.38	1.58
注：以上数据由吉林大学环境工程实验室提供.

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表 2 空气饱和度实验参数

Table 2. Schedule of testing programm in air saturation experiment

表面活性剂	介质	浓度(mg/L)	表面张力(mN/m)	曝气量(mL/min)
SDBS	中砂	0	72.2	6, 16, 40, 100, 160, 400, 833, 1 667, 2 500, 3 333
		150	59.0
		250	54.6
		350	49.5
		500	45.2
		1 000	39.6

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参考文献(13)

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