Evaluation of Changes in Hydrogeological Properties of Porous Media Induced by air Sparging in Sand Matrix

Zhao, Hongfei1; Yang, Jiakuan2; Fan, Wei1; Huo, Mingxin1; Ma, Yuhui3; Liu, Lei4; Yang, Xia1

2017-06

10.1007/s11270-017-3412-7

WATER AIR AND SOIL POLLUTION   影响因子和分区

0049-6979

1573-2932

Air sparging (AS) is one of the most efficient techniques for remediating saturated soils and ground-water contaminated with volatile organic compounds. Most studies have focused on how the subsurface conditions control the AS process; however, the "sideeffects" of AS that feed back to subsurface environment have not been well addressed. This paper studied the perturbation of porous media induced by AS and the consequent multi-parameter changes with the support of Miller soil box and resistivity test, and Darcy experiment and tracer breakthrough test. The Miller soil box test shows that the resistivity response can be credibly used as a non-intrusive method to indicate the porosity change, and that the porosity-resistivity data can be well fitted using Archie equation (R-2 > 0.98). Based upon the electricity measurement and above quantitive relationship, it was found that the porosity increased near the air injection point and decreased near the upper boundary of the column due to the upward-transport of particles during air sparging. The changes in porosity were found to be directly proportional to the air injection rate, and the maximum absolute variation of porosity was up to 0.104 at the air flow rate of 20 ml/min, while it did not change in the absence of AS. Both the hydraulic conductivity and dispersion coefficient increased after AS perturbation as the preferential flow pathway formed. The two parameters changed from 3.40 m/d and 0.110 to 6.13 m/d and 0.288, respectively, at 20 ml/min. This work provides useful insight into the changes in flow and transport properties of porous media induced by AS, which then help to understand the instability of air flow and the parameter-uncertainty analysis in related AS model.

Air sparging Perturbation Porosity Hydraulic conductivity Dispersion coefficient

SCI ; EI

英语

其他

New Century Excellent Talents in University of Ministry of Education of China[NCET-13-0723]

Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences ; Water Resources

Environmental Sciences ; Meteorology & Atmospheric Sciences ; Water Resources

WOS:000403574100034

SPRINGER INTERNATIONAL PUBLISHING AG

20172403770840

Air ; Dispersions ; Groundwater ; Groundwater flow ; Groundwater pollution ; Hydraulic conductivity ; Porosity ; Porous materials ; Remediation ; Soil structure interactions ; Soils ; Uncertainty analysis ; Volatile organic compounds

Groundwater:444.2 ; Environmental Impact and Protection:454.2 ; Soils and Soil Mechanics:483.1 ; Foundations:483.2 ; Hydraulics:632.1 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Probability Theory:922.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

ENVIRONMENT/ECOLOGY

Web of Science

1.Northeast Normal Univ, Sch Environm, Changchun 130117, Peoples R China
2.Huazhong Univ Sci & Technol, Sch Environm Sci & Engn, Wuhan 430074, Peoples R China
3.Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Zhao, Hongfei,Yang, Jiakuan,Fan, Wei,et al. Evaluation of Changes in Hydrogeological Properties of Porous Media Induced by air Sparging in Sand Matrix[J]. WATER AIR AND SOIL POLLUTION,2017,228(6).

Zhao, Hongfei.,Yang, Jiakuan.,Fan, Wei.,Huo, Mingxin.,Ma, Yuhui.,...&Yang, Xia.(2017).Evaluation of Changes in Hydrogeological Properties of Porous Media Induced by air Sparging in Sand Matrix.WATER AIR AND SOIL POLLUTION,228(6).

Zhao, Hongfei,et al."Evaluation of Changes in Hydrogeological Properties of Porous Media Induced by air Sparging in Sand Matrix".WATER AIR AND SOIL POLLUTION 228.6(2017).