CN111289419A - Measuring device for engineering barrier membrane effect in heavy metal pollution site - Google Patents
Measuring device for engineering barrier membrane effect in heavy metal pollution site Download PDFInfo
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- CN111289419A CN111289419A CN202010214326.XA CN202010214326A CN111289419A CN 111289419 A CN111289419 A CN 111289419A CN 202010214326 A CN202010214326 A CN 202010214326A CN 111289419 A CN111289419 A CN 111289419A
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- 230000004888 barrier function Effects 0.000 title claims abstract description 55
- 230000000694 effects Effects 0.000 title claims abstract description 38
- 239000012528 membrane Substances 0.000 title claims abstract description 35
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000011521 glass Substances 0.000 claims abstract description 30
- 239000000523 sample Substances 0.000 claims description 129
- 229910001220 stainless steel Inorganic materials 0.000 claims description 63
- 239000010935 stainless steel Substances 0.000 claims description 63
- 239000002689 soil Substances 0.000 claims description 49
- 229920005372 Plexiglas® Polymers 0.000 claims description 21
- 239000004575 stone Substances 0.000 claims description 18
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 16
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- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 abstract description 9
- 150000002500 ions Chemical class 0.000 abstract description 9
- 238000013508 migration Methods 0.000 abstract description 8
- 230000005012 migration Effects 0.000 abstract description 8
- 239000004927 clay Substances 0.000 description 22
- 239000000126 substance Substances 0.000 description 11
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- 239000004816 latex Substances 0.000 description 8
- 229920000126 latex Polymers 0.000 description 8
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- 239000000463 material Substances 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000000979 retarding effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 230000014759 maintenance of location Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Biochemistry (AREA)
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Abstract
The invention provides a device for measuring the barrier film effect of a project in a heavy metal polluted site, which comprises: the water tank is of a cover-free cuboid structure; the water-resisting support is arranged at the bottom of the water tank, the cross section of the water-resisting support is in a hollow rectangular shape with an inscribed semicircle, semicircular O-shaped rings are arranged on the water-resisting support, three water-resisting supports are arranged, and the water tank is divided into a first solution tank, a water-resisting support tank and a second solution tank by the water-resisting support; the organic glass cavity, the organic glass cavity level is placed on the semi-circular O type circle, the organic glass cavity is used for providing airtight stable experimental environment. The device for measuring the membrane effect of the engineering barrier in the heavy metal polluted site can help researchers to know the influence of the membrane effect of the engineering barrier in the heavy metal polluted site on the migration and diffusion behavior of ions and the influence of the membrane effect on the strain of the engineering barrier.
Description
Technical Field
The invention relates to the technical field of geological engineering and environmental geotechnical engineering, in particular to a device for measuring the barrier film effect of a project in a heavy metal polluted site.
Background
In recent years, with the enhancement of global environmental awareness, numerous environmental remediation technologies have been developed and utilized. The clay engineering barrier is an engineering restoration technology based on passive isolation, and has the advantages of large restoration area, environmental friendliness, simplicity and convenience in construction and the like, and can be widely applied to heavy metal polluted sites. As a low-permeability clay material, the engineering barrier has a certain retarding effect on heavy metal solutes carried in the infiltrated groundwater within a long period of time in the remediation of heavy metal contaminated sites. However, the retarding properties of clay engineering barriers are also affected by changes in the surrounding chemical environment.
Membrane effect refers to the phenomenon of limited solute transport in porous media, which results in chemical osmotic flow, i.e., the flow of liquid from a region of lower solute concentration to a region of higher solute concentration. For clay engineering barriers, the semi-permeable membrane behavior refers to the retention behavior of clay on chemical solutes, thereby limiting the ability of the solutes to pass through. The characteristic is closely related to the migration and diffusion behavior of solutes permeating into underground water, and is taken as one of the key points of the research on the barrier engineering performance of clay engineering. The membrane efficiency coefficient of compacted clay has a significant relationship with the solution concentration difference on both sides of the clay. For the same clay barrier, when the absolute value of the concentration difference between two sides of the clay exceeds a certain value, the performance of the character of the clay barrier semipermeable membrane can be completely inhibited. However, for clay engineering barriers operated for a long time, the solution concentration difference between two sides of the clay engineering barrier tends to increase gradually with time, and when the solution concentration difference between two sides of the clay engineering barrier exceeds a certain value, the blocking performance of the clay engineering barrier may be lost.
In heavy metal contaminated site remediation projects, semi-permeable membrane behavior has a potentially significant impact on the diffusion of solutes in the project barrier. However, there is no well-established apparatus and method for determining the membrane efficiency coefficient of clay engineering barriers.
Disclosure of Invention
The invention provides a device for measuring the membrane effect of an engineering barrier in a heavy metal pollution field, and aims to solve the problem that researchers cannot deeply know the influence of the membrane effect of the engineering barrier in the heavy metal pollution field on ion migration and diffusion behaviors and the influence of the membrane effect on engineering barrier strain.
In order to achieve the above object, an embodiment of the present invention provides an apparatus for measuring a barrier film effect of a process in a heavy metal contaminated site, including:
the water tank is of a cover-free cuboid structure;
the water-resisting support is arranged at the bottom of the water tank, the cross section of the water-resisting support is in a hollow rectangular shape with an inscribed semicircle, semicircular O-shaped rings are arranged on the water-resisting support, three water-resisting supports are arranged, and the water tank is divided into a first solution tank, a water-resisting support tank and a second solution tank by the water-resisting support;
the organic glass cavity, the organic glass cavity level is placed on the semi-circular O type circle, the organic glass cavity is used for providing airtight stable experimental environment.
Wherein, the basin includes:
a first solution sensor probe disposed within the first solution tank;
a second solution sensor probe disposed within the second solution tank.
Wherein the plexiglass chamber comprises:
a first stainless steel side cover disposed at a first end of the plexiglass chamber, the first stainless steel side cover being connected to the first end of the plexiglass chamber;
a second stainless steel side cover disposed at a second end of the plexiglass chamber, the second stainless steel side cover being connected to the second end of the plexiglass chamber;
the first solution channel is arranged in the center of the first stainless steel side cover in a penetrating mode, and a plurality of round small holes are formed in the first solution channel;
the second solution passageway, the second solution passageway is worn to establish in the center of second stainless steel side cap, be provided with a plurality of circular apertures in the second solution passageway, first solution passageway with the second solution passageway passes through the emulsion membrane and connects, first solution passageway with porous stone, filter paper, soil sample, filter paper and porous stone have been placed in proper order between the second solution passageway, the emulsion membrane will porous stone filter paper with the soil sample parcel is lived.
Wherein, be provided with a cavity inhalant canal on the first stainless steel side cover, the first end of cavity inhalant canal wears to establish in the first stainless steel side cover.
The second stainless steel side cover is provided with a cavity drainage channel, the first end of the cavity drainage channel penetrates through the second stainless steel side cover, the second end of the cavity drainage channel is connected with a first hose, and the first hose is provided with a switch.
Wherein, still include:
a data acquisition unit;
a first end of the first sensor expansion interface is electrically connected with a first end of the data collector, and a second end of the first sensor expansion interface is electrically connected with a first end of the first solution sensor probe;
a first end of the second sensor expansion interface is electrically connected with a second end of the data collector, and a second end of the second sensor expansion interface is electrically connected with a first end of the second solution sensor probe;
a volume pressure controller in communication with the second end of the chamber water inlet passage through a second hose.
Wherein, still include:
the first TDR time domain reflection probe is arranged in the soil sample, the first end of the first TDR time domain reflection probe is inserted in the soil sample, and the second end of the first TDR time domain reflection probe penetrates through the first solution channel and is electrically connected with the third end of the first sensor expansion interface;
and the second TDR time domain reflection probe is arranged in the soil sample, the first end of the second TDR time domain reflection probe is inserted in the soil sample, and the second end of the second TDR time domain reflection probe penetrates through the second solution channel and is electrically connected with the third end of the second sensor expansion interface.
The scheme of the invention has the following beneficial effects:
according to the device for measuring the engineering barrier film effect in the heavy metal polluted site, the water tank provides a solution tank with acid and alkali corrosion resistance, and the environment of the engineering barrier in the heavy metal solution in reality is restored; the water-proof support at the bottom of the water tank is tightly attached to the whole body formed by the organic glass cavity, the first stainless steel side cover and the second stainless steel side cover, so that a closed environment is provided for the whole test; insert TDR time domain reflection probe in the soil sample, the change of real-time supervision soil sample water content in the experimentation, volume pressure controller provides the confined pressure environment for the soil sample, the strain data of soil sample in the experimentation has been recorded simultaneously, receive all data and the analysis of gathering in the experimentation through data collection station, can help the researcher to know the influence of the membrane effect of engineering barrier in the heavy metal pollution place to ion migration diffusion behavior, and the influence of membrane effect to engineering barrier strain, provide reliable theoretical foundation for the design of clay engineering barrier.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic view of the structure of the sink of the present invention;
fig. 3 is a schematic view of the internal structure of the plexiglass chamber of the present invention.
[ description of reference ]
1-a water tank; 2-a water-proof bracket; 3-a first solution tank; 4-a second solution tank; 5-organic glass chamber; 6-a first solution sensor probe; 7-a second solution sensor probe; 8-a first stainless steel side cover; 9-a second stainless steel side cover; 10-a first solution channel; 11-a second solution channel; 12-a permeable stone; 13-soil sample; 14-latex film; 15-chamber water inlet channel; 16-chamber drain channel; 17-a first hose; 18-a switch; 19-a data collector; 20-a first sensor expansion interface; 21-a second sensor expansion interface; 22-volume pressure controller; 23-a second hose; 24-a first TDR time domain reflectometry probe; 25-a second TDR time domain reflectometry probe; 26-semicircular O-rings; 27-circular orifice.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a device for measuring the membrane effect of an engineering barrier in a heavy metal pollution field, aiming at the problem that the existing researchers cannot deeply know the influence of the membrane effect of the engineering barrier in the heavy metal pollution field on the ion migration and diffusion behaviors and the influence of the membrane effect on the strain of the engineering barrier.
As shown in fig. 1 to 3, an embodiment of the present invention provides an apparatus for determining a barrier film effect in a heavy metal contaminated site, including: the water tank 1 is of a cover-free cuboid structure; the water-resisting support 2 is arranged at the bottom of the water tank 1, the cross section of the water-resisting support 2 is in a hollow rectangle with an inscribed semicircle, the water-resisting support 2 is provided with a semicircular O-shaped ring 26, the water-resisting support 2 is provided with three blocks, and the water tank 1 is divided into a first solution tank 3, a water-resisting support tank and a second solution tank 4 by the water-resisting support 2; an organic glass chamber 5, the organic glass chamber 5 level is placed on the semi-circular O type circle 26, organic glass chamber 5 is used for providing airtight stable experimental environment.
In the device for measuring the engineering barrier film effect in the heavy metal polluted site according to the embodiment of the invention, the water tank 1 is made of transparent organic glass material and has good acid and alkali corrosion resistance, the cross section of the water-resisting support 2 is in a rectangular shape of a hollowed-out inscribed semicircle, the diameter of the inscribed semicircle of the water-resisting support 2 is consistent with the cross section of the whole cylinder formed by connecting the first stainless steel side cover 8, the organic glass chamber 5 and the second stainless steel side cover 9, the water-resisting support 2 is used for supporting the whole cylinder formed by connecting the first stainless steel side cover 8, the organic glass chamber 5 and the second stainless steel side cover 9 and separating the water tank 1, the water tank 1 is separated into three areas of the first solution tank 3, the water-resisting support tank and the second solution tank 4, different chemical solutions are respectively placed in the first solution tank 3 and the second solution tank 4, the waterproof support is characterized in that the first stainless steel side cover 8, the organic glass cavity 5 and the second stainless steel side cover 9 are arranged in the waterproof support groove, the whole cylinder formed by connecting the first stainless steel side cover 8, the organic glass cavity 5 and the second stainless steel side cover 9 is good in sealing performance, the semicircular O-shaped ring 26 on the waterproof support 2 is tightly attached and clamped with the whole cylinder formed by connecting the first stainless steel side cover 8, the organic glass cavity 5 and the second stainless steel side cover 9, and the semicircular O-shaped ring 26 plays a role in sealing and waterproof effects.
Wherein the water tank 1 includes: a first solution sensor probe 6, the first solution sensor probe 6 being disposed in the first solution tank 3; a second solution sensor probe 7, the second solution sensor probe 7 being disposed in the second solution tank 4.
Wherein the plexiglas chamber 5 comprises: a first stainless steel side cover 8, the first stainless steel side cover 8 being disposed at a first end of the plexiglass chamber 5, the first stainless steel side cover 8 being connected with the first end of the plexiglass chamber 5; a second stainless steel side cover 9, said second stainless steel side cover 9 being disposed at a second end of said plexiglas chamber 5, said second stainless steel side cover 9 being connected with a second end of said plexiglas chamber 5; a first solution channel 10, wherein the first solution channel 10 is arranged in the center of the first stainless steel side cover 8 in a penetrating manner, and a plurality of round small holes 27 are arranged in the first solution channel 10; second solution passageway 11, second solution passageway 11 wears to establish in the center of second stainless steel side cap 9, be provided with a plurality of circular apertures 27 in the second solution passageway 11, first solution passageway 10 with second solution passageway 11 passes through emulsion membrane 14 and connects, first solution passageway 10 with permeable stone 12, filter paper, soil sample 13, filter paper and permeable stone 12 have been placed in proper order between the second solution passageway 11, emulsion membrane 14 will permeable stone 12 filter paper with soil sample 13 wraps up.
Wherein, be provided with a cavity inhalant canal 15 on the first stainless steel side cap 8, the first end of cavity inhalant canal 15 wears to establish in the first stainless steel side cap 8.
A chamber drainage channel 16 is arranged on the second stainless steel side cover 9, a first end of the chamber drainage channel 16 is arranged in the second stainless steel side cover 9 in a penetrating mode, a second end of the chamber drainage channel 16 is connected with a first hose 17, and a switch 18 is arranged on the first hose 17.
According to the device for measuring the engineering barrier membrane effect in the heavy metal pollution site, two ends of the organic glass cavity 5 are respectively connected with the first stainless steel side cover 8 and the second stainless steel side cover 9, the first solution channel 10 is arranged in the center of the first stainless steel side cover 8, the second solution channel 11 is arranged in the center of the second stainless steel side cover 9, the cavity water inlet channel 15 is arranged on the first stainless steel side cover 8, and the cavity water outlet channel 16 is arranged on the second stainless steel side cover 9; the permeable stone 12, the filter paper, the soil sample 13, the filter paper and the permeable stone 12 are sequentially placed between the first solution channel 10 and the second solution channel 11, and the permeable stone 12, the filter paper and the soil sample 13 are wrapped by the latex film 14; the chamber water inlet channel 15 is communicated with the volume pressure controller 22 through a second hose 23, the second end of the chamber water discharge channel 16 is connected with the first hose 17, and the first hose 17 is provided with a switch 18.
Wherein, still include: a data collector 19; a first sensor expansion interface 20, a first end of the first sensor expansion interface 20 is electrically connected with a first end of the data collector 19, and a second end of the first sensor expansion interface 20 is electrically connected with a first end of the first solution sensor probe 6; a second sensor expansion interface 21, a first end of the second sensor expansion interface 21 is electrically connected to a second end of the data collector 19, and a second end of the second sensor expansion interface 21 is electrically connected to a first end of the second solution sensor probe 7; a volume pressure controller 22, said volume pressure controller 22 being in communication with a second end of said chamber inlet channel 15 via a second hose 23.
In the device for measuring the engineering barrier film effect in the heavy metal contaminated site according to the above embodiment of the present invention, the data collector 19 collects the relevant data in the water tank 1 through the first solution sensor probe 6 and the second solution sensor probe 7, the data collector 19 collects the relevant data of the soil sample 13 in the organic glass chamber 5 through the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25, the volume pressure controller 22 is communicated with the chamber water inlet channel 15 through the second hose 23, the volume pressure controller 22 makes the organic glass chamber 5 filled with distilled water and provides confining pressure for the soil sample 13, the volume pressure controller 22 records the change of the volume of the distilled water in the organic glass chamber 5 and the strain data of the soil sample 13 during the test process, therefore, the volume change of the soil sample 13 during the test can be obtained, and the method can be used for researching the strain rule under the barrier membrane effect of clay engineering.
Wherein, still include: a first TDR time domain reflection probe 24, where the first TDR time domain reflection probe 24 is disposed in the soil sample 13, a first end of the first TDR time domain reflection probe 24 is inserted into the soil sample 13, and a second end of the first TDR time domain reflection probe 24 passes through the first solution channel 10 and is electrically connected to a third end of the first sensor expansion interface 20; a second TDR time domain reflection probe 25, the second TDR time domain reflection probe 25 is disposed in the soil sample 13, a first end of the second TDR time domain reflection probe 25 is inserted in the soil sample 13, and a second end of the second TDR time domain reflection probe 25 passes through the second solution channel 11 and is electrically connected to a third end of the second sensor expansion interface 21.
In the apparatus for measuring the engineering barrier film effect in the heavy metal contaminated site according to the above embodiment of the present invention, the first ends of the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 are inserted into the soil sample 13 and are wrapped by the latex film 14, the lines of the second ends of the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 respectively penetrate through one of the circular small holes 27 in the first solution channel 10 and the second solution channel 11 along the sidewall of the soil sample 13 and the permeable stone 12 inside the latex film 14, and then the lines of the second ends of the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 are respectively electrically connected to the third ends of the first sensor expansion interface 20 and the second sensor expansion interface 21 outside the organic glass chamber 5, a first end of the first sensor extension interface 20 is electrically connected to a first end of the data collector 19, a first end of the second sensor expansion interface 21 is electrically connected to a second end of the data collector 19, the lines of the second ends of the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 and the lines of the first ends of the first solution sensor probe 6 and the second solution sensor probe 7 are all arranged outside the organic glass chamber 5 and are independent and not interfered with each other, the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 propagate, reflect and transmit in the form of electromagnetic waves in the soil sample 13, the data collected by the first TDR time domain reflectometry probe 24 and the second TDR time domain reflectometry probe 25 may be used to reflect data such as water content and structural deformation of the soil sample 13.
According to the device for measuring the engineering barrier film effect in the heavy metal polluted site, the first end of the organic glass cavity 5 is connected with the first stainless steel side cover 8, and then the first end of the latex film 14 is sleeved on the first solution channel 10; then, a line of a second end of the first TDR time domain reflection probe 24 passes through a circular small hole 27 in the first solution channel 10, a first end of the first TDR time domain reflection probe 24 is inserted into the soil sample 13, then, the second end of the first TDR time domain reflection probe 24 is electrically connected with a third end of the first sensor extension interface 20, the first end of the first sensor extension interface 20 is electrically connected with a first end of the data acquisition unit 19, and then, the permeable stone 12, the filter paper and the soil sample 13 are connected with the first solution channel 10 in this order; then inserting a first end of the second TDR time domain reflection probe 25 into the soil sample 13, wherein a line of a second end of the second TDR time domain reflection probe 25 passes through a circular small hole 27 in the second solution channel 11, a second end of the second TDR time domain reflection probe 25 is electrically connected with a third end of the second sensor extension interface 21, a first end of the second sensor extension interface 21 is electrically connected with a second end of the data acquisition unit 19, and then sequentially connecting the soil sample 13, the filter paper, the permeable stone 12 and the second solution channel 11; then, the latex film 14 initially covering the first solution channel 10 is slowly pulled straight until the second end of the latex film 14 covers the second solution channel 11, and then the second end of the plexiglass chamber 5 is connected to the second stainless-steel side cover 9, so that the first stainless-steel side cover 8, the plexiglass chamber 5 and the second stainless-steel side cover 9 form a water-tight seal. Subsequently, the chamber water inlet channel 15 is communicated with the volume pressure controller 22 through a second hose 23, the second end of the chamber water discharge channel 16 is connected with the first hose 17, and the first hose 17 is provided with a switch 18; and (5) completing the preparation work, and then carrying out the next step of measuring the barrier membrane effect of the engineering. Firstly, the switch 18 on the first hose 17 is closed, and the volume pressure controller 22 is controlled to deliver distilled water into the plexiglass chamber 5 until the distilled water fills the whole plexiglass chamber 5; subsequently, using the volume pressure controller 22 to provide a confining pressure into the plexiglas chamber 5, which acts on the soil sample 13 wrapped by the latex film 14 through the distilled water in the plexiglas chamber 5; then, the cylinder body formed by connecting the first stainless steel side cover 8, the organic glass chamber 5 and the second stainless steel side cover 9 is integrally placed on the semicircular O-ring 26 of the water isolating bracket 2 at the bottom of the water tank 1, and the semicircular O-ring 26 seals and clamps the joint position of the cylinder body formed by connecting the first stainless steel side cover 8, the organic glass chamber 5 and the second stainless steel side cover 9; at this time, the water tank 1 is divided into three regions: the first zone is the first solution tank 3; the second area is the water-resisting support groove; the third area is the second solution tank 4; subsequently, distilled water is added to the first solution tank 3 so that the height of the distilled water is slightly higher than the position of the first solution channel 10 in the first stainless-steel side cover 8, and the distilled water is sequentially passed through the first solution channel 10 in the first stainless-steel side cover 8, the water-permeable stone 12, the filter paper, the soil sample 13, the filter paper and the water-permeable stone 12, and then flows out from the second solution channel 11 in the second stainless-steel side cover 9 into the second solution tank 4; after the soil sample 13 is saturated, the distilled water in the first solution tank 3 and the second solution tank 4 is discharged. Then, chemical solutions with different concentrations (such as 0.01-0.5mol/L NaCl solution and CaCl2 solution) are respectively added into the first solution tank 3 and the second solution tank 4 in the water tank 1, so that a certain chemical concentration gradient is formed between the first solution tank 3 and the second solution tank 4; subsequently, the first solution sensor probe 6 is placed in the first solution tank 3, and the second solution sensor probe 7 is placed in the second solution tank 4; at this time, due to the semi-permeable membrane effect of the soil sample 13, the first solution sensor probe 6 and the second solution sensor probe 7 disposed in the first solution tank 3 and the second solution tank 4 may measure an osmotic pressure difference Δ P in the first solution tank 3 and the second solution tank 4, where Δ P is theoretically equal to an osmotic pressure difference generated at both ends of the soil sample 13 in value, and measure the water content of the soil sample 13 through the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 in the soil sample 13; meanwhile, the chemical solutions in the first solution tank 3 and the second solution tank 4 are collected once a day, and the electrical conductivity EC thereof is measured; when the measured chemical pressure difference Δ P is stabilized, measuring the ion concentrations in the first solution tank 3 and the second solution tank 4 by using the first solution sensor probe 6 and the second solution sensor probe 7 disposed in the first solution tank 3 and the second solution tank 4, and obtaining a chemical concentration gradient difference Δ C between both ends of the soil sample 13; then, the solutions in the first solution tank 3 and the second solution tank 4 are respectively changed into ion solutions of the same type with higher concentration, the above experiment operations are repeated, and so on, until the ratio of the osmotic pressure difference Δ P and the chemical concentration gradient difference Δ C at the two ends of the soil sample 13 reaches stability, the first end of the data collector 19 is electrically connected with the first end of the first sensor extension interface 20, the second end of the data collector 19 is electrically connected with the first end of the second sensor extension interface 21, the second end of the first sensor extension interface 20 is electrically connected with the first end of the first solution sensor probe 6, the third end of the first sensor extension interface 20 is electrically connected with the second end of the first TDR time domain reflection probe 24, and the second end of the second sensor extension interface 21 is electrically connected with the first end of the second solution sensor probe 7, the third end of the second sensor expansion interface 21 is electrically connected with the second end of the second TDR time domain reflection probe 25, the data collector 19 is connected with the second end of the second TDR time domain reflection probe 25 through the first TDR time domain reflection probe 24 and the second TDR time domain reflection probe 25 receive the water content data of the soil sample 13 and the chemical concentration gradient difference of the two ends of the soil sample 13, the data collector 19 respectively receives the solution concentration data in the first solution tank 3 and the second solution tank 4 through the first solution sensor probe 6 and the second solution sensor probe 7, so as to obtain the osmotic pressure difference between the first solution tank 3 and the second solution tank 4 and the relevant data of the solution conductivity in the first solution tank 3 and the second solution tank 4, so as to obtain the membrane efficiency coefficient of the soil sample 13 and analyze the influence of the characteristics of engineering barrier materials on the ion migration diffusion behaviors, the device is simple and feasible, and is used for researching the influence of the membrane effect of the engineering barrier on the migration and diffusion behavior of ions in the heavy metal polluted site; on the other hand, the method improves the performance of the clay engineering barrier, improves the retardation performance of the clay engineering barrier, prolongs the engineering life of the clay engineering barrier, can help researchers deeply know the influence of the membrane effect of the engineering barrier in a heavy metal polluted site on the ion migration diffusion behavior and the influence of the membrane effect on the engineering barrier strain, and provides a reliable theoretical basis for the design and construction of the clay engineering barrier.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A survey device of engineering barrier membrane effect in heavy metal contaminated site which characterized in that includes:
the water tank is of a cover-free cuboid structure;
the water-resisting support is arranged at the bottom of the water tank, the cross section of the water-resisting support is in a hollow rectangular shape with an inscribed semicircle, semicircular O-shaped rings are arranged on the water-resisting support, three water-resisting supports are arranged, and the water tank is divided into a first solution tank, a water-resisting support tank and a second solution tank by the water-resisting support;
the organic glass cavity, the organic glass cavity level is placed on the semi-circular O type circle, the organic glass cavity is used for providing airtight stable experimental environment.
2. The apparatus for measuring the effect of a barrier membrane in a heavy metal contaminated site according to claim 1, wherein the water tank comprises:
a first solution sensor probe disposed within the first solution tank;
a second solution sensor probe disposed within the second solution tank.
3. The apparatus for determining the effect of the engineering barrier film in the heavy metal polluted site according to claim 2, wherein the organic glass chamber comprises:
a first stainless steel side cover disposed at a first end of the plexiglass chamber, the first stainless steel side cover being connected to the first end of the plexiglass chamber;
a second stainless steel side cover disposed at a second end of the plexiglass chamber, the second stainless steel side cover being connected to the second end of the plexiglass chamber;
the first solution channel is arranged in the center of the first stainless steel side cover in a penetrating mode, and a plurality of round small holes are formed in the first solution channel;
the second solution passageway, the second solution passageway is worn to establish in the center of second stainless steel side cap, be provided with a plurality of circular apertures in the second solution passageway, first solution passageway with the second solution passageway passes through the emulsion membrane and connects, first solution passageway with porous stone, filter paper, soil sample, filter paper and porous stone have been placed in proper order between the second solution passageway, the emulsion membrane will porous stone filter paper with the soil sample parcel is lived.
4. The device for determining the effect of the engineering barrier film in the heavy metal polluted site according to claim 3, wherein a chamber water inlet channel is arranged on the first stainless steel side cover, and a first end of the chamber water inlet channel is arranged in the first stainless steel side cover in a penetrating manner.
5. The device for measuring the effect of the engineering barrier film in the heavy metal polluted site according to claim 4, wherein a chamber drainage channel is arranged on the second stainless steel side cover, a first end of the chamber drainage channel is arranged in the second stainless steel side cover in a penetrating mode, a second end of the chamber drainage channel is connected with a first hose, and a switch is arranged on the first hose.
6. The device for measuring the effect of the engineering barrier film in the heavy metal polluted site according to claim 5, further comprising:
a data acquisition unit;
a first end of the first sensor expansion interface is electrically connected with a first end of the data collector, and a second end of the first sensor expansion interface is electrically connected with a first end of the first solution sensor probe;
a first end of the second sensor expansion interface is electrically connected with a second end of the data collector, and a second end of the second sensor expansion interface is electrically connected with a first end of the second solution sensor probe;
a volume pressure controller in communication with the second end of the chamber water inlet passage through a second hose.
7. The device for measuring the effect of the engineering barrier film in the heavy metal polluted site according to claim 6, further comprising:
the first TDR time domain reflection probe is arranged in the soil sample, the first end of the first TDR time domain reflection probe is inserted in the soil sample, and the second end of the first TDR time domain reflection probe penetrates through the first solution channel and is electrically connected with the third end of the first sensor expansion interface;
and the second TDR time domain reflection probe is arranged in the soil sample, the first end of the second TDR time domain reflection probe is inserted in the soil sample, and the second end of the second TDR time domain reflection probe penetrates through the second solution channel and is electrically connected with the third end of the second sensor expansion interface.
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