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Method for quantitatively monitoring DNAPL (Dense Nonaqueous Phase Liquid) migration process and saturation degree

A technique of saturation and migration, applied in the field of environmental pollution

Active Publication Date: 2014-06-11
NANJING UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there are few reports on the use of this method to obtain the DNAPL saturation in the medium and quantify the distribution of pollutants.

Method used

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  • Method for quantitatively monitoring DNAPL (Dense Nonaqueous Phase Liquid) migration process and saturation degree
  • Method for quantitatively monitoring DNAPL (Dense Nonaqueous Phase Liquid) migration process and saturation degree
  • Method for quantitatively monitoring DNAPL (Dense Nonaqueous Phase Liquid) migration process and saturation degree

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Embodiment 1

[0039] The effect of the present invention is verified below in conjunction with specific embodiments

[0040] In this experiment, the LCR measurement voltage is set to 1V, and the measurement frequency is 1KHZ. The stained TCE was pumped from the figure 1 Inject into the No. 9 hole in the middle at a rate of 0.5ml / min. The start time of injection was 16:50 and the end time was 18:25, which took 95 minutes in total, and a total of 42.5ml of TCE was injected. A total of 41.8ml of water was discharged during the experiment.

[0041] Processing the acquired data yields the following results:

[0042] (1) From figure 2 The distribution map of the saturation at different times in the medium can clearly reproduce the migration law of DNAPL. In the DNAPL infiltration area, the DNAPL saturation in the lower part is higher than that in the upper part, and the middle part is higher than the two sides, indicating that DNAPL mainly migrates longitudinally. The lateral migration is ...

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Abstract

The invention discloses a method for quantitatively monitoring a DNAPL (Dense Nonaqueous Phase Liquid) migration process and the saturation degree. According to the method, an infiltration test of DNAPL is carried out in a two-dimensional sand box and a light transmission method and a high-density resistivity method are used for dynamically monitoring; a CCD (Charge Coupled Device) camera and an LCR (Inductance, Capacitance and Resistance) digital electric bridge are respectively used for acquiring data. A calculation formula of the DNAPL saturation degree in water-DNAPL two phases is used for processing the data of the light transmission method. The data processing of the high-density resistivity method is to convert resistance value data into a resistivity value and utilize an Archie formula to obtain saturation degree space distribution of heavy non-aqueous phase liquid. In the Archie formula, a parameter beta value is obtained by a novel method combined with the light transmission method and the total amount of the DNAPL injected into the sand box can be evaluated by the saturation degree space distribution of different moments; then the total amount is compared with an actually-measured infiltration capacity. A result shows that an infiltration process of the DNAPL in a saturated pore medium can be quantitatively monitored and the estimated DNAPL infiltration capacity is matched with an actually-measured value very well.

Description

technical field [0001] The invention relates to the field of pollution environment, in particular to a method for quantitatively monitoring the transport process and saturation of DNAPL pollutants. Background technique [0002] The pollution of immiscible organic compounds in soil and groundwater environment is one of the hot research directions in the field of environmental pollution. Such immiscible organic compounds are usually called non-aqueous phase liquid (Non-Aqueous Phase Liquid-NAPL), in which the specific gravity greater than water is called heavy non-aqueous phase liquid (DNAPL-Dense NAPL), and the specific gravity less than water is called Light non-aqueous liquid (LNAPL-Light NAPL). In recent years, many scholars at home and abroad have devoted themselves to the study of NAPL migration law and its saturation (O'Carroll et al., 2007; Chambers et al., 2004; Xu Yanbing et al., 2009), but the current domestic research mainly focuses on LNAPL (Wu Xiaofeng et al., ...

Claims

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Application Information

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IPC IPC(8): G01N21/17G01N27/04
Inventor 叶淑君吴吉春郭健
Owner NANJING UNIV
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