表面活性剂强化空气扰动修复中不同介质曝气流量作用及变化规律

发布时间：2018-05-28 21:25

  本文选题：表面活性剂 + 空气扰动　； 参考：《中国环境科学》2017年09期

【摘要】：采用填装中砂(0.25~0.5mm)、粗砂#1(0.5~1.0mm)、粗砂#2(1.0~2.0mm)的一维砂柱,研究了气流在孔道流和鼓泡流运行方式下,原位空气扰动(AS)技术中曝气流量与空气饱和度和曝气压力的关系,以及添加表面活性剂后的关系变化,并探讨了在中砂介质中表面活性剂的添加对苯污染物去除效率的影响,结果表明:在同一种粒径中,空气饱和度随着曝气流量的升高而增大,最后趋于平稳;相同的曝气流量下,AS技术在地下水中空气饱和度与介质粒径呈负相关关系,而在表面活性剂(SDBS)浓度为200mg/L的地下水中空气饱和度与介质粒径呈正相关关系;这说明AS技术在地下水的修复过程中较粗的介质往往需要较大的曝气流量,而表面活性剂的添加,则可以有效的改变这种情况.曝气压力随着气体流量的上升而线性增加,线性方程的斜率与介质粒径呈负相关关系.当介质粒径为0.5~1.0mm时,在一定表面张力范围内表面张力与空气饱和度呈反比关系,当表面张力大于49m N/m时空气饱和度趋于稳定.当介质粒径为0.25~0.5mm时,表面活性剂的添加可以有效的提高苯污染物的去除效率.
[Abstract]:Using one-dimensional sand column with filling medium sand 0.25m 0.50mm, coarse sand #10. 5m 1.0mm and coarse sand #21.021.0mm), the relationship between aeration flow rate and air saturation and aeration pressure in in-situ air disturbance (ASA) technology under pore flow and bubbling flow mode was studied. The effect of surfactant addition on the removal efficiency of benzene pollutants in medium sand was discussed. The results showed that in the same particle size, the effect of adding surfactant on the removal efficiency of benzene was studied. The air saturation increases with the increase of aeration flow, and tends to be stable at last, and the air saturation in groundwater is negatively correlated with the particle size of the medium under the same aeration flow. However, there is a positive correlation between air saturation and medium particle size in groundwater with 200mg/L concentration, which indicates that the thicker medium often needs larger aeration flow rate in the process of groundwater remediation by as technology, and the addition of surfactant, Can effectively change this situation. The aeration pressure increases linearly with the increase of gas flow rate, and the slope of the linear equation is negatively related to the particle size of the medium. When the particle size of the medium is 0.5~1.0mm, the surface tension is inversely proportional to the air saturation in a certain range of surface tension, and the air saturation tends to be stable when the surface tension is greater than 49 m N / m. When the particle size of the medium is 0.25~0.5mm, the addition of surfactant can effectively improve the removal efficiency of benzene pollutants.
【作者单位】： 吉林大学地下水资源与环境教育部重点实验室;
【基金】：国家自然科学基金重点项目(3A215BK01425) 北京市教育委员会市属高校创新能力提升计划(tjshg201310772028)
【分类号】：X505
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本文编号：1948244