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Method and device for monitoring osmotic suction force in heavy metal contaminated site through time domain reflection

A technology of time domain reflection and heavy metals, which is applied in the direction of measuring devices, instruments, and material analysis through electromagnetic means, and can solve the problems of low automation, complicated steps, and inability to monitor for a long time

Active Publication Date: 2020-06-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is similar to the squeeze method, but there are problems such as complicated steps, time-consuming and labor-intensive, unable to monitor for a long time, and low degree of automation
In the prior art, there are few development methods for efficient measurement of osmotic suction in soil, and there are few efficient monitoring methods for osmotic suction in heavy metal polluted sites

Method used

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  • Method and device for monitoring osmotic suction force in heavy metal contaminated site through time domain reflection
  • Method and device for monitoring osmotic suction force in heavy metal contaminated site through time domain reflection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 of the present invention provides a model test to simulate the horizontal migration of Cu ions in the heavy metal Cu ion-contaminated site, aiming at long-term observation of the osmotic suction of the soil in the polluted site. For the test device, please refer to figure 1 , please refer to the operation process figure 2 . The specific operation steps are as follows:

[0040] Step 1, carry out the calibration test of soil volume moisture content-dielectric constant: dry the undisturbed soil, grind, and sieve; control the volume moisture content n% in the range of 10-40% and equal gradient, the gradient is 5%; Prepare a container with a certain volume V, according to the dry density ρ of the undisturbed soil d , container volume V, volume moisture content n%, calculate the mass m of dry soil to be filled s = ρ d V, the volume of water n% V, the total mass of soil and water ρ d V+n%V, choose the mass of dry soil M when mixing soil s >m s , the volume...

Embodiment 2

[0046] Embodiment 2 of the present invention provides a kind of model test of controlling suction, simulates the Cu ion polluted soil with different matrix suction or total suction value, aims to measure the osmotic suction of polluted soil with different suction values, test device please refer to figure 1 , please refer to the operation process figure 2 . The specific operation steps are as follows:

[0047] Steps 1 to 4 are the same as in Example 1.

[0048] Step five, press figure 1 The connection test instrument shown in the figure uses a semi-permeable membrane 6 and is filled with Cu ion-contaminated soil, and the dry density of the filled soil is similar to that of the undisturbed soil.

[0049] Step 6, close the inlet valve and the outlet valve, start the solution circulation system 3, and make the CuCl 2 The solution and the Cu ion-contaminated soil produce water migration until CuCl 2 Suction balance between solution and polluted soil, in order to obtain Cu io...

Embodiment 3

[0052] Embodiment 3 of the present invention provides a time-domain reflectometry device for monitoring osmotic suction in heavy metal-contaminated sites, including a plexiglass chamber 1 , a total suction control system 2 , a solution circulation system 3 , and a TDR data acquisition system 4 . Wherein, both ends of the plexiglass chamber 1 are provided with permeable stones 5, and the inner side of the permeable stone 5 at each end is provided with a detachable semi-permeable membrane 6, and the soil body 7 to be tested is filled in the plexiglass chamber 1, and the semi-permeable membrane 6 is located between the permeable stone 5 and the soil body 7 to be tested. The permeable stone 5 can block soil particles through liquid, and the semi-permeable membrane 6 can block solute molecules through water molecules. In embodiment 1, the semi-permeable membrane 6 is disassembled, so that the heavy metal ions can penetrate into the soil 7 to be tested when the heavy metal solution ...

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Abstract

The invention provides a method for monitoring an osmotic suction force in a heavy metal contaminated site through time domain reflection. The method comprises: carrying out an in-situ test of a soilosmotic suction force; carrying out a model test of heavy metal pollutant migration; and carrying out a model test of heavy metal contaminated site control suction; to be specific, acquiring a soil dielectric constant and soil conductivity in real time through a TDR data acquisition system, calculating a soil body volume moisture content, the pore solution conductivity, a pore solution solute concentration, a soil body osmotic suction force, a soil body matrix suction force and a soil body total suction force, and comparing a measured suction value with a control suction value in the model test of the control suction. The method is used for monitoring and researching the osmotic suction force of the heavy metal contaminated site; the method is convenient to operate, disturbance to undisturbed soil is extremely small, measured data are rapid and accurate, the time domain reflection technology has good time and space resolution, and long-term automatic monitoring can be conducted on migration of water and solute.

Description

technical field [0001] The invention relates to the technical field of environmental engineering geology and soil suction measurement, in particular to a method and device for monitoring osmotic suction in heavy metal polluted sites by time domain reflection method. Background technique [0002] total suction in unsaturated soil matrix suction and osmotic suction (π). Generally speaking, matric suction is dominant, however, when the water content and salt content in the soil are high, the effect of osmotic suction is more significant. With the development of urban industrialization, a large amount of soil is polluted by heavy metals. Heavy metal contaminated sites are mostly unsaturated soil, and soil pore water is rich in heavy metal salts. Therefore, the measurement of osmotic suction in heavy metal contaminated sites is very important. [0003] At present, there are many measurement methods for the total suction and matrix suction of unsaturated soils, which can be ...

Claims

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Application Information

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IPC IPC(8): G01N27/04G01N27/22G01N13/04
CPCG01N13/04G01N27/041G01N27/221
Inventor 贺勇喻志鹏朱锋张可能薛生国李冰冰蒋文强胡广
Owner CENT SOUTH UNIV
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