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Airflow rate and variation in different media during surfactant-enhanced air sparging remediation |
YAO Meng, WANG He-fei, HAN Hui-hui, QIN Chuan-yu, ZHAO Yong-sheng |
Key Laboratory of Groundwater Resources and Environment, Ministry of Education Jilin University, Changchun 130000, China |
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Abstract 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).
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Received: 02 March 2017
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[1] |
李璐璐,赵勇胜,王贺飞,等.溶剂萃取分离地下强化抽出处理液中的污染物和表面活性剂[J]. 中国环境科学, 2014,34(4):912-916.
|
[2] |
程洲,吴吉春,徐红霞,等.DNAPL在透镜体及表面活性剂作用下的运移研究[J]. 中国环境科学, 2014,34(11):2888-2896.
|
[3] |
Zhang S Y, Lv C, Meng Q L, et al. Influence factors of remediation of benzene in groundwater by air sparging[J]. Advanced Materials Research, 2012,610-613:1662-1666.
|
[4] |
Adams J A, Reddy K R. Removal of dissolved-and free-phase benzene pools from ground water using in situ air sparging[J]. Journal of Environmental Engineering, 2000,126(8):697-707.
|
[5] |
Jun-Ho L, Jun W H, Kap-Sik J, et al. The radius of influence of a combined method of in situ air sparging and soil vapor extraction in the intertidal sediments of Gomso Bay on the west coast of South Korea[J]. Springer Plus, 2016,5(1):1388.
|
[6] |
Waduge W A P, Soga K, Kawabata J. Effect of NAPL entrapment conditions on air sparging remediation efficiency[J]. Journal of hazardous materials, 2004,110(1-3):173-183.
|
[7] |
And S W R, Ong S K. Influence of Porous Media, airflow rate, and air channel spacing on benzene NAPL removal during air sparging[J]. Environ. Sci. Technol., 2000,34(5):764-770.
|
[8] |
Tsai Y J. Air flow paths and porosity/permeability change in a saturated zone during in situ air sparging[J]. Journal of hazardous materials, 2007,142(1/2):315-323.
|
[9] |
Qin C Y, Zheng W, et al., Remediation of nonaqueous phase liquid polluted sites using surfactant-enhanced air sparging and soil vapor extraction[J]. Water Environ. Res., 2013,85(2):133.
|
[10] |
秦传玉,赵勇胜,郑苇.表面活性剂强化空气扰动修复氯苯污染含水层[J]. 地球科学, 2011,36(4):761-764.
|
[11] |
秦传玉,赵勇胜,郑苇.表面活性剂强化空气扰动技术修复机理[J]. 土木建筑与环境工程, 2012,34(2):138-142.
|
[12] |
Mccray J E, Falta R W. Numerical Simulation of Air Sparging for Remediation of NAPL Contamination[J]. Groundwater, 1997, 35(1):99-110.
|
[13] |
Neriah A B, Paster A. Effect of Temporal Changes in Air Injection Rate on Air Sparging Performance Groundwater Remediation[J]. Ground water, 2016,54(6):851-860.
|
[14] |
Kim H, Soh H E, Annable M D, et al. Surfactant-enhanced air sparging in saturated sand[J]. Environ. sci. Technol., 2004,38(4):1170.
|
[15] |
Hu L, Wu X, Liu Y, et al. Physical modeling of air flow during air sparging remediation[J]. Environmental science & technology, 2010,44(10):3883-3888.
|
[16] |
Hu L, Meegoda J N, Du J, et al. Centrifugal study of zone of influence during air-sparging[J]. Journal of Environmental Monitoring Jem., 2011,13(9):2443-2449.
|
[17] |
王贺飞,宋兴龙,赵勇胜,等.地下水曝气技术气流模拟实验研究[J]. 中国环境科学, 2014,34(11):2813-2816.
|
[18] |
Reddy K R, Adams J. Conceptual modeling of air sparing for groundwater remediation[J]. 2008.
|
[19] |
秦传玉,赵勇胜,郑苇,等.空气扰动技术对地下水中氯苯污染晕的控制及去除效果[J]. 吉林大学学报(地), 2010,40(1):164-168.
|
[20] |
Song X, Zhao Y, Wang H, et al. Predictive models and airflow distribution associated with the zone of influence (ZOI) during air sparging remediation[J]. Sci. Tot. Environ., 2015,537:1-8.
|
[21] |
Kim H, Ahn D, Annable M D. Enhanced removal of VOCs from aquifers during air sparging using thickeners and surfactants:Bench-scale experiments[J]. Journal of Contaminant Hydrology, 2016,184(5):25-34.
|
[22] |
Heonki Kim, Michael D. Annable, P. S.C. Rao, et al. Laboratory evaluation of surfactant-enhanced air sparging for perchloroethene source mass depletion from sand[J]. Journal of Environmental Science & Health Part A Toxic/hazardous Substances & Environmental Engineering, 2009,44(4):406-413.
|
[23] |
Kim H, Choi K M, Moon J W, et al. Changes in air saturation and air-water interfacial area during surfactant-enhanced air sparging in saturated sand[J]. J. Contaminant Hydrology, 2006,88(1/2):23.
|
[24] |
Kim J, Kim H, Annable M D. Changes in air flow patterns using surfactants and thickeners during air sparging:Bench-scale experiments[J]. Journal of contaminant hydrology, 2015,172:1-9.
|
[25] |
Wei J, Amine D, Ahlfeld D P, et al. Laboratory Study of Air Sparging:Air Flow Visualization[J]. Ground Water Monitoring & Remediation, 1993,13(4):115-126.
|
[26] |
Peterson J W. Grain-Size Heterogeneity and Subsurface Stratification in Air Sparging of Dissolved-Phase Contamination:Laboratory Experiments-Field Implications[J]. Environmental & Engineering Geoscience, 2003,9(1):71-82.
|
[27] |
Reddy K R, Adams J A. System effects on benzene removal from saturated soils and ground water using air sparging[J]. Journal of Environmental Engineering, 1998,124(3):288-299.
|
[28] |
Corey A T. Mechanics of immiscible fluids in porous media[R]. Mechanics of Immiscible Fluids in Porous Media, 1994.
|
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