Imaging method for repairing two-dimensional model test through air sparging

Abstract

The invention discloses an imaging method for repairing two-dimensional model test through air sparging. The imaging method comprises the following steps: (1) squarely distributing testing electrodes on a front panel of a two-dimensional model test tank at equal intervals, wherein the resistivity test is based on a Wenner four-electrode method by adopting a business high-density electrical method instrument; (2) filling polluted saturated soil according to research need, and then determining the initial resistivity values of all points in a space; (3) after air sparging repair tests start, measuring the resistivity at every 5-10 minutes until the resistivity of a soil body is stable after the sparging stops; (4) drawing a soil body resistivity contour map or cloud chart on the basis of linear interpolation, thus being capable of realizing the visualization imaging of the air sparging repair process. The quantitative evaluation on the vapor phase movement rule and repair effect of the sparging process can be realized by establishing the relation between the soil body vapor saturation as well as pollutant concentration and the resistivity. According to the method, the visualized image of the sparging repair process can be obtained without the sampling analysis in the test process.

Description

technical field [0001] The invention relates to an imaging method utilizing high-density resistivity, in particular to a two-dimensional model test imaging method for groundwater aeration restoration. Background technique [0002] Groundwater aeration technology (AirSparging, AS) is considered to be one of the most effective methods for removing volatile organic compounds from saturated soil and groundwater. AS is a technology complementary to Soil Vapor Extraction (SVE), whose purpose is to remove volatile / semi-volatile organic pollutants in groundwater below the water table. AS technology injects fresh air into the saturated soil below the groundwater level. Through the process of gas-liquid-solid mass transfer, pollutants volatilize from the soil or groundwater into the air, and the air containing pollutants rises continuously under the action of buoyancy to reach the groundwater level. In the above unsaturated area, under the action of SVE system vacuum extraction, the ...

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Problems solved by technology

[0004] Technical problem: Aiming at the demand of the indoor model test of the aeration method, the present invention provides a resistivity visualization imaging method for the movement law of the gas phase in the groundwater saturated zone during the two-dimensional model test process of groundwater aeration repair, and the distribution of pollutant concentration in the soil before and after repair , so as to provide a better monitoring method for the indoor model test of the aeration method, which is more conducive to the experimental research of the aeration repair mechanism

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