A series of one-dimensional column experiments of air sparging remediation with different aquifer media (medium sand, coarse sand) were conducted in this study. The relationships between airflow rate and sparging pressure, air saturation under pore flow and bubbly flow conditions were investigated respectively; the effects of surfactant-enhanced air sparging (SEAS) were also discussed. The results demonstrated that the air saturation increased with the increase of the airflow rate and finally tended to be stable in the same medium. The air saturation of the aquifer was negatively related with the medium grain size under the same airflow rate condition. However, the air saturation was positively correlated with the medium grain size when surfactant (SDBS) was added in the aquifer. This showed that the coarser medium often required larger airflow rate, and it could be changed by adding the surfactant to the aquifer. Sparging pressure increased linearly with the increase of airflow rate, and the slope of the linear equation was negatively correlated with the medium grain size. The air saturation of the aquifer was inversely proportional to the surface tension of groundwater, however, the air saturation tended to be stable when the surface tension was greater than 49mN/m in the coarse sand (0.5~1.0mm). The addition of surfactant could effectively improve the removal efficiency of benzene and shorten the remedial time in the medium sand (0.25~0.5mm).
姚猛, 王贺飞, 韩慧慧, 秦传玉, 赵勇胜. 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[J]. 中国环境科学, 2017, 37(9): 3332-3338.
YAO Meng, WANG He-fei, HAN Hui-hui, QIN Chuan-yu, ZHAO Yong-sheng. Airflow rate and variation in different media during surfactant-enhanced air sparging remediation. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(9): 3332-3338.
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