CN114152543B - Device and method for researching migration and diffusion of in-situ injection medicament in soil layer - Google Patents
Device and method for researching migration and diffusion of in-situ injection medicament in soil layer Download PDFInfo
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- CN114152543B CN114152543B CN202111346563.2A CN202111346563A CN114152543B CN 114152543 B CN114152543 B CN 114152543B CN 202111346563 A CN202111346563 A CN 202111346563A CN 114152543 B CN114152543 B CN 114152543B
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- 239000007924 injection Substances 0.000 title claims abstract description 135
- 238000002347 injection Methods 0.000 title claims abstract description 135
- 239000002689 soil Substances 0.000 title claims abstract description 106
- 238000009792 diffusion process Methods 0.000 title claims abstract description 46
- 230000005012 migration Effects 0.000 title claims abstract description 37
- 238000013508 migration Methods 0.000 title claims abstract description 37
- 239000003814 drug Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 239000000243 solution Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000005192 partition Methods 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 239000007800 oxidant agent Substances 0.000 claims description 21
- 238000012360 testing method Methods 0.000 claims description 20
- 230000008439 repair process Effects 0.000 claims description 19
- 239000012190 activator Substances 0.000 claims description 16
- 239000003344 environmental pollutant Substances 0.000 claims description 14
- 231100000719 pollutant Toxicity 0.000 claims description 14
- 230000001590 oxidative effect Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 239000003673 groundwater Substances 0.000 claims description 10
- 230000002572 peristaltic effect Effects 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000593 degrading effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010835 comparative analysis Methods 0.000 claims 1
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 244000035744 Hura crepitans Species 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 229910001415 sodium ion Inorganic materials 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- G01N2013/003—Diffusion; diffusivity between liquids
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a device and a method for researching migration and diffusion of in-situ injection medicament in a soil layer, wherein the device comprises a model box system and a medicament injection system; the model box system comprises a model box, a first pipeline and two partition boards; the partition plates are symmetrically arranged in the model box along the length direction of the model box, and a plurality of water seepage holes are formed in the partition plates; the model box is divided into a first chamber, a second chamber and a third chamber by two partition plates, water injection holes are formed in the tops of the first chamber and the third chamber, drain holes are formed in the bottoms of the first chamber and the third chamber, and the first chamber and the third chamber are communicated through an external first pipeline; the medicament injection system comprises injection equipment, a solution barrel, a second pipeline and pressurizing equipment; the pressurizing device, the solution barrel and the injection device are sequentially connected through a second pipeline; the solution tank and the pressurizing device are arranged outside the model box, and the injection device is arranged in the second chamber.
Description
Technical Field
The invention belongs to the technical field of environmental geotechnical engineering research, and particularly relates to a device and a method for researching migration and diffusion of in-situ injection medicaments in a soil layer.
Background
The chemical oxidation in-situ injection is a common technical method for in-situ restoration of polluted sites because of the characteristics of simple construction of restoration technology, small damage to stratum structures, strong adaptability, high restoration efficiency, good persistence, low cost and the like.
The repair effect of the chemical oxidation in-situ injection technology is not only influenced by the concentration and the dosage of the chemical agent, but also the migration and diffusion characteristics of the chemical oxidation in the soil layer are key to influence the repair efficiency of the chemical oxidation in-situ injection technology. Secondly, in the design of the chemical oxidation in-situ injection repair system, the distance and depth of injection points and various injection parameters (such as injection pressure, flow and the like) are set according to the characteristics of the transverse and longitudinal diffusion distances of the repair agent in the soil layer.
At present, research on migration and diffusion of solutes such as repairing agents in soil is mainly focused on methods such as soil column test, two-dimensional sand box and numerical simulation. The soil column test and the two-dimensional sand box are difficult to obtain the migration and diffusion characteristics of solutes in the three-dimensional soil layer space, and the numerical simulation method is often simplified to a certain extent in the modeling process, so that the characteristics of an actual soil layer on site are difficult to simulate.
Therefore, it is necessary to provide a device and a method for researching migration and diffusion of in-situ injection medicament in soil layers.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device and a method for researching migration and diffusion of an in-situ injection medicament in a soil layer, researching migration and diffusion characteristics of a repair medicament in a three-dimensional stratum and providing theoretical support for technical parameter setting of an in-situ injection system aiming at the defects of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a device for researching migration and diffusion of in-situ injection medicament in soil layer comprises a model box system and a medicament injection system; the model box system comprises a model box, a first pipeline and two partition boards; the partition plates are symmetrically arranged in the model box along the length direction of the model box, and a plurality of water seepage holes are formed in the partition plates; the model box is divided into a first chamber, a second chamber and a third chamber by two partition plates, water injection holes are formed in the tops of the first chamber and the third chamber, drain holes are formed in the bottoms of the first chamber and the third chamber, and the first chamber and the third chamber are communicated through an external first pipeline; the medicament injection system comprises injection equipment, a solution barrel, a second pipeline and pressurizing equipment; the pressurizing device, the solution barrel and the injection device are sequentially connected through a second pipeline; the solution tank and the pressurizing device are arranged outside the model box, and the injection device is arranged in the second chamber.
As a further preferred aspect of the present invention, the injection device comprises an injection tube, a sleeve and a tube screen; the bottom of the sleeve is provided with a base for penetrating into a soil layer, and a plurality of holes are distributed on the pipe screen; the sleeve, the tube sieve and the liquid injection tube are sequentially arranged from outside to inside; one end of the liquid injection pipe is connected with the second pipeline, and the other end of the liquid injection pipe is arranged on the base; the casing and the screen pipe are connected to the base.
As a further preferred aspect of the present invention, the base is conical.
As a further preferred aspect of the invention, the top of the first chamber is provided with a pressure hole.
In a further preferred aspect of the present invention, the material of the mold box is transparent PVC plastic.
The invention further preferably further comprises clamping grooves, wherein the four clamping grooves are respectively arranged in the model box and are used for fixing the two partition boards.
As a further preferred aspect of the present invention, the solution tank bottom is provided with an outflow hole, and the second pipe is connected to the outflow hole of the solution tank bottom.
As a further preferred aspect of the present invention, the first pipe and the second pipe are made of transparent PE, and the aperture of the second pipe is identical to the aperture of the outlet, the inlet pipe, and the pressurizing device.
As a further preferred aspect of the present invention, the pressurizing device is a peristaltic pump.
A method for researching migration and diffusion of in-situ injection medicament in soil layer,
step (1): the partition board is arranged at a clamping groove corresponding to the inside of the model box, and the model box is divided into a first cavity, a second cavity and a third cavity; the first chamber is communicated with the third chamber through an external first pipeline;
step (2): sequentially stacking various field soil layers in the second chamber from bottom to top according to stratum information, geological parameters and the like of the actual polluted site to form a field stratum model; when a new soil layer is piled up, the soil layer piled up in front is stable, and the height of the final soil layer after the soil layer is stable is consistent with that of the partition plate;
step (3): respectively injecting groundwater into the first chamber and the third chamber through the water injection holes, and controlling the water level and the hydraulic gradient of the two chambers to be consistent with the actual field through the pressure holes according to hydrogeological data of the polluted field; the first chamber is an underground water upstream area, the third chamber is an underground water downstream area, and the first chamber and the third chamber jointly form an underground water flow field model;
step (4): after the on-site stratum model and the underground water flow field model are relatively stable, vertically inserting the injection equipment into a soil layer from the top of the soil layer to a preset depth, determining the preset depth through past engineering implementation experience similar to the soil layer characteristics of the existing actual polluted site, slowly extracting the sleeve, and compacting the soil layer to enable the injection equipment to be buried to achieve a sealing effect;
step (5): preparing oxidant solution and activator solution with preset concentration in a solution barrel, and mixing according to a certain proportion, wherein the currently adopted proportion method is to drill a polluted soil sample from the site, analyze the type, concentration and soil characteristics of the pollutants, and perform an indoor small test to determine the type of oxidant and activator which are relatively good in degrading the pollutants in the soil and the concentration proportion parameter of the oxidant/activator;
step (6): communicating the injection device, the solution tank and the pressurizing device using a second conduit;
step (7): opening the pressurizing equipment, slowly increasing injection parameters such as injection pressure, injection flow rate and the like until reaching preset optimal parameter values, wherein the optimal parameter values refer to injection parameters corresponding to the deepest diffusion depth and the largest diffusion radius of the medicament in the model soil layer according to the condition of transferring and diffusing the medicament in the model soil layer under different injection parameters, and selecting the injection parameters as optimal injection parameters, continuously injecting the repairing medicament configured in the solution barrel into the polluted soil layer through a second pipeline and the injecting equipment, and closing the pressurizing equipment after reaching the required injection flow calculated according to the test on a small test;
step (8): after the preset repair days are reached, measuring the pollutant concentration, the oxidant concentration and the ion concentration in soil layers and underground water at different positions transversely and longitudinally from the injection point by using detection equipment to obtain the change condition of spatial distribution diagrams of the soil layers and the underground water at different positions, and analyzing the migration and diffusion characteristics of the repair agent in the three-dimensional soil layers. And obtaining the correlation corresponding relation between the migration and diffusion of the repairing agent and the injection parameter system. .
The invention has the following beneficial effects:
1. the test device for researching the migration and diffusion of chemical oxidation in-situ injection medicament in the on-site polluted soil layer provided by the invention can simulate the migration and diffusion of solute in a three-dimensional medium, enriches the research method of solute migration, and is not only limited to a column test and a two-dimensional sandbox test;
2. the invention can truly simulate the actual polluted soil layer and the underground water flow field in the field, and the simulated in-situ injection repair process is consistent with the actual field engineering;
3. the model box system is made of corrosion-resistant visual materials, so that on one hand, the conditions of soil layers and underground water flow fields in the simulation test process can be directly observed, and on the other hand, the interference of external test materials on the test can be effectively avoided;
4. the test device can be used for simulating the migration and diffusion characteristics of the repair agent in the soil layer under different stratum models, different groundwater flow fields and different injection technical parameters, so that the indoor test is in maximum accord with the real data of the on-site chemical oxidation in-situ injection repair system, and the result of the indoor test is greatly improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a front view of the present invention;
fig. 3 is a schematic structural view of the injection apparatus.
The method comprises the following steps: 1. a model box; 2. a partition plate; 3. a first chamber; 4. a second chamber; 5. a third chamber; 6. a first pipe; 7. an injection device; 8. a solution barrel; 9. a pressurizing device; 10. a clamping groove; 11. a water injection hole; 12. a drain hole; 13. a pressure hole; 14. a liquid injection pipe; 15. a tube screen; 16. a sleeve; 17. an outflow hole; 18. a second pipe; 19. and (5) a base.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present invention. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
As shown in fig. 1-3, the present invention provides a device for studying migration and diffusion of in situ injection agents in soil layers, comprising a model box system and an agent injection system.
The model box system comprises a model box 1, a first pipeline 6 and two partition boards 2; the baffle 2 is arranged inside the model box 1 along the length direction symmetry of the model box 1, a plurality of water seepage holes are arranged on the baffle 2, and the water seepage holes are round holes with tiny apertures. Two baffles 2 divide into first cavity 3, second cavity 4 and third cavity 5 with model case 1, and water injection hole 11 has been seted up at the top of first cavity 3 and third cavity 5, and drain hole 12 has been seted up to the bottom of first cavity 3 and third cavity 5, and first cavity 3 and third cavity 5 communicate through external first pipeline 6. The top of the first chamber 3 is provided with a pressure hole 13. The second chamber 4 is used for filling various soil layers from bottom to top to form a bottom layer model part.
The medicament injection system comprises an injection device 7, a solution tank 8, a second conduit 18 and a pressurizing device 9. The pressurizing device 9, the solution barrel 8 and the injecting device 7 are sequentially connected through a second pipeline 18; the solution tank 8 and the pressurizing device 9 are provided outside the mold box 1, and the injection device 7 vertically penetrates into the soil layer of the second chamber 4. The solution tank 8 is used for storing an oxidizer solution, an activator solution, and a mixed solution thereof. The bottom of the solution barrel 8 is provided with an outflow hole 17, and the second pipeline 18 is connected with the outflow hole 17 at the bottom of the solution barrel 8. The pressurizing device 9 is a peristaltic pump, so that parameters such as injection rate and the like can be well adjusted.
As shown in fig. 1, in the present embodiment: the preferable length and width of the model box 1 are 150cm, 120cm and 100cm, the model box is made of transparent PVC plastic plates, and the thickness of the model box is 10mm. Two pairs of clamping grooves 10 are formed in the mold box and used for installing and fixing the partition plate 2, each pair of clamping grooves 10 are symmetrically distributed in the mold box 1, the distance from the side face of the mold box 1 is 15cm, the width of each groove is 10mm, and the grooves are clamped with the partition plate 2. The height of the separator is 100cm and is consistent with that of the model box 1, the thickness is 10mm, the diameter of micropores on the separator is 5mm, and the interval is 3mm. The water injection hole 11 and the water discharge hole 12 are used for water injection and water discharge, the upper part of the first chamber 3 is provided with a pressure hole 13 for pressurization, in the embodiment, the diameters of the water inlet hole 11, the water discharge hole 12 and the pressure hole 13 are 15mm, and all plastic sealing covers exist, and the sealing effect is achieved when the water inlet hole 11, the water discharge hole 12 and the pressure hole 13 are not used.
As shown in fig. 2, the injection device 7 is a circular tube device with a conical bottom, a hollow middle part and a sealable top. The injection device 7 comprises an injection tube 14, a sleeve 16 and a tube screen 15; the bottom of the sleeve 16 is provided with a base 19 for penetrating into a soil layer, and a plurality of holes are distributed on the pipe screen 15; the sleeve 16, the tube sieve 15 and the liquid injection tube 14 are sequentially arranged from outside to inside; one end of the liquid injection pipe 14 is connected with the second pipeline 18, and the other end is placed on the base 19; casing 16 and screen 15 are attached to base 19. The base 19 is conical, so that the soil layer can be conveniently penetrated, and the resistance is reduced. The sleeve 16 mainly plays a protective role to protect the tube sieve 15 and the injection tube 14 from damage when the injection device 7 penetrates the soil layer. In this embodiment, the liquid injection tube 14 is a transparent PE tube with a diameter of 10mm, the tube sieve 15 is made of stainless steel, the distance is 1mm, the diameter is 30mm, the sleeve 16 is a transparent PVC plastic tube with an inner diameter of 31mm and an outer diameter of 35mm. The aperture of the second conduit 18 corresponds to the interface aperture of the outflow opening 17, the filling pipe 14 and the pressurizing device 9. The bottom of the pipe plug 15 is in sealing connection with the base 19, the pipe screen 15 has the function of enabling the medicament to slowly permeate into the soil layer under the action of pressure difference, if the pipe screen 15 is not provided, the instantaneous flow rate of the medicament can be too large, and therefore a preferential channel can be formed in the soil layer, the medicament flows from the preferential channel, and deviation exists between the current injection repair technology and the actual injection repair technology.
The solution barrel 8 is used for storing an oxidizing agent, an activating agent and a mixed solution of the oxidizing agent and the activating agent, in the embodiment, the solution barrel 8 is made of PVC plastic, the height is 30cm, the inner diameter is 20cm, the outer diameter is 22cm, the solution storage volume meets the dosage requirement of the embodiment, the diameter of the outflow hole 17 at the bottom of the barrel is 10mm, and the pressurizing device 9 and the injecting device 7 are communicated by matching with the second pipeline 18. The first pipe 6 and the second pipe 18 are transparent PE pipes with a diameter of 10mm, which can be varied according to the size of the connection hole.
The pressurizing device 9 adopts a peristaltic pump, and has the specification that: the rotation speed is less than 100rpm, the transmission pressure is 0-0.2 mpa, the working rotation speed is 0.1-50 r/min, and the flow speed range is 0.005-20 ml/min. In this example, the peristaltic pump is set at 70rpm, the delivery pressure is 0.2MPa, and the flow rate is 0.5-1.5ml/min.
A method for studying migration and diffusion of in situ injection agents in soil layers, comprising the steps of:
step (1): the partition plate 2 is arranged at a corresponding clamping groove 10 in the model box 1 to divide the model box 1 into a first chamber 3, a second chamber 4 and a third chamber 5; the first chamber 3 and the third chamber 5 are communicated through an external first pipeline 6;
step (2): sequentially compacting and stacking various field soil layers in the second chamber 4 from bottom to top according to stratum information, geological parameters and the like of the actual polluted site to form a field stratum model; when a new soil layer is piled up, the soil layer piled up in front is stable, and the height of the final soil layer after the soil layer is stable is consistent with that of the partition board (2);
step (3): the underground water is respectively injected into the first chamber 3 and the third chamber 5 through the water injection holes 11, and the water level and the hydraulic gradient of the two areas are controlled to be consistent with the actual field through the pressure holes 13 according to the hydrogeological data of the polluted field; the first chamber 3 is an underground water upstream area, the third chamber 5 is an underground water downstream area, and the first chamber 3 and the third chamber 5 jointly form an underground water flow field model. Because the permeability of the compacted soil layer is very small, groundwater only slowly flows to the soil layer, which is almost equal to a sealing state.
Step (4): after the on-site stratum model and the underground water flow model are stable, the injection device 7 is vertically inserted into the soil layer from the top of the soil layer to a preset depth, the sleeve 16 is slowly pulled out, and then the soil layer is compacted to enable the injection device 7 to be buried to achieve a sealing effect. The pre-estimated depth is usually determined approximately by the past engineering implementation experience of soil layer characteristics similar to those of the existing actual contaminated site, and requires an experimenter to determine according to actual conditions;
step (5): the oxidizer solution and the activator solution with predetermined concentration are prepared in the solution barrel 8 and mixed according to a certain proportion, and the current proportion mixing method is to drill a polluted soil sample from the site, analyze the type, concentration and soil characteristics of the pollutants, and then perform another indoor small test to determine the oxidizer and activator types which are relatively superior to the degradation of the pollutants in the soil and the concentration proportion parameters of the oxidizer/activator. The concentration ratios of the oxidizing agent, the type of activator, and the oxidizing agent/activator are different for different organic contaminants.
Step (6): using a second conduit 18 to communicate the injection device 7, the solution tank 8 and the pressurizing device 9;
step (7): opening the pressurizing equipment 9, slowly increasing injection parameters such as injection pressure, injection flow rate and the like until reaching an optimal parameter value, continuously injecting the repairing medicament configured in the solution barrel 8 into a polluted soil layer through the second pipeline 18 and the injection equipment 7, closing the pressurizing equipment 9 after reaching a preset injection flow rate, determining the optimal injection parameter according to specific migration and diffusion characteristics of the medicament in the model soil layer, comparing migration and diffusion characteristic conditions of the medicament in the soil layer under different injection parameters, selecting the injection parameter corresponding to the deepest diffusion depth and the largest diffusion radius as the optimal injection parameter, and determining the preset injection flow rate as the sum of volumes of the oxidant, the activator and the water actually required according to the optimal pollutant concentration/oxidant concentration/activator concentration ratio and the water-soil ratio determined by laboratory small test;
step (8): after the preset repair days are reached, the practical measuring equipment measures the concentration of pollutants, sodium ions, sulfate ions and other ions in soil layers and groundwater at different positions transversely and longitudinally from the injection point, obtains the change conditions of the pollutants, the sodium ions, the sulfate ions and other ions in different spatial distribution diagrams, and analyzes the migration and diffusion characteristics in the three-dimensional soil layers of the repair agent. And obtaining the correlation corresponding relation between the migration and diffusion of the repairing agent and the injection parameter system. . The method for measuring each pollutant is different, like volatile organic compounds are often measured by a gas chromatography mass spectrometer, oxidant persulfates are measured by a spectrophotometer, and ion concentrations are measured by ion chromatography. Because holes are distributed on the partition plate 2, the injected medicament can slowly move along with the groundwater, and the repairing effect is achieved.
Application of the method in a specific test scene: for example:
step (1): the partition plate 2 is arranged at a corresponding clamping groove 10 in the model box 1 to divide the model box 1 into a first chamber 3, a second chamber 4 and a third chamber 5;
step (2): and (3) sequentially stacking field soil layers in the second chamber 4 from bottom to top, uniformly paving the polluted clay layers with the height of 80cm, sprinkling water to enable the soil to be fully contacted with moisture, compacting by using a tool after 3 days, discharging air, and measuring the density of the compacted soil to be 1.86g/cm < 3 >. And then sequentially stacking a site silty sand soil layer, a silty clay soil layer and a mixed filling soil layer according to the method, wherein the heights of the compacted soil layers are 25cm, 30cm and 5cm respectively, and the densities are 1.85g/cm < 3 >, 1.82g/cm < 3 > and 1.78g/cm < 3 >.
Step (3): groundwater is respectively injected into the first chamber 3 and the third chamber region 5 through the water injection holes 11, the water levels of the left region and the right region are controlled to be 1m and 0.8m respectively according to hydrogeological data of a polluted site, the first chamber 3 is pressurized by 40kpa through the pressure holes 13, and the hydraulic gradient is controlled to be 50;
step (4): after the soil layer and the groundwater flow field are stabilized on the remodelling site, the injection device 7 is inserted into the depth of 40cm from the side surface of the model box 1 at the position of 75cm from the front surface of the soil layer top and 60cm from the front surface, the diffusion range of the medicament in the transverse direction is approximately a circular area with a certain radius, so the injection point is considered to be arranged in the middle of the soil layer, the injection depth is selected in consideration of the fact that the injection point needs to have a certain depth, and the upper space and the lower space of the injection point allow the medicament to diffuse upwards and downwards, thereby the diffusion radius of the medicament in the transverse direction and the distance of upwards and downwards diffusion in the longitudinal direction can be clearly obtained. After the injection equipment is inserted, the sleeve 16 is extracted, then the injection pipe 14 is stretched into the pipe screen 15, the sleeve 16 is slowly extracted, and then the injection equipment 7 is buried and sealed with a soil layer;
step (5): the persulfate solution with the concentration of 0.2mol/L and the ferrous sulfate heptahydrate solution with the concentration of 0.05mol/L are prepared in a solution barrel 8 and mixed according to the proportion of 1:1, the concentration of the oxidant persulfate and the concentration of the ferrous sulfate heptahydrate as an activator are determined according to an indoor small test, and the ratio after being mixed according to the proportion of 1:1 is a relatively optimal ratio;
step (6): using a second pipe 18 to communicate the injection device 7, the mixed solution storage tank 8 and the pressurizing device 9;
step (7): opening a peristaltic pump, slowly increasing injection parameters such as injection pressure, injection flow rate and the like until reaching the pressure of 0.2Mpa, wherein the flow rate is 1.2ml/min, continuously injecting the repairing agent into the polluted soil layer, closing the peristaltic pump after reaching the injection flow rate of 2.5L, determining the parameters of the injection pressure and the injection flow rate according to construction experience of the soil-like polluted site, and calculating the injection flow rate according to the concentration of the pollutant and the proportion of the repairing agent;
step (8): and after the preset repair days are 3 days, 7 days, 15 days and 30 days, measuring the concentration of pollutants, sodium persulfate concentration, sodium ions, sulfate ions and other ion concentrations in soil layers and groundwater at the position of 0.2m intervals from the transverse direction and the longitudinal direction of the injection point, obtaining the change conditions of different spatial distribution patterns at different times, and analyzing the migration and diffusion characteristics in the three-dimensional soil layers of the repair agent.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (7)
1. A migration and diffusion method for researching a device for migration and diffusion of an in-situ injection medicament in a soil layer is characterized by comprising the following steps of: the device comprises a model box system and a medicament injection system;
the model box system comprises a model box (1), a first pipeline (6) and two partition boards (2); the partition plates (2) are symmetrically arranged inside the model box (1) along the length direction of the model box (1), and a plurality of water seepage holes are formed in the partition plates (2); the two partition boards (2) divide the model box (1) into a first chamber (3), a second chamber (4) and a third chamber (5), water injection holes (11) are formed in the tops of the first chamber (3) and the third chamber (5), drain holes (12) are formed in the bottoms of the first chamber (3) and the third chamber (5), and the first chamber (3) and the third chamber (5) are communicated through an external first pipeline (6);
the medicament injection system comprises an injection device (7), a solution barrel (8), a second pipeline (18) and a pressurizing device (9); the pressurizing device (9), the solution barrel (8) and the injection device (7) are sequentially connected through a second pipeline (18); the solution barrel (8) and the pressurizing device (9) are arranged outside the model box (1), and the injection device (7) is arranged in the second chamber (4);
the top of the first chamber (3) is provided with a pressure hole (13);
the device also comprises clamping grooves (10), wherein the four clamping grooves (10) are respectively arranged in the model box (1) and are used for fixing the two partition boards (2);
the migration and diffusion method is as follows:
step (1): the partition board (2) is arranged at a clamping groove (10) corresponding to the inside of the model box (1), and the model box (1) is divided into a first chamber (3), a second chamber (4) and a third chamber (5); the first chamber (3) and the third chamber (5) are communicated through an external first pipeline (6);
step (2): according to stratum information, geological parameters and the like of an actual polluted site, various field soil layers are sequentially piled up in the second chamber (4) from bottom to top to form a field stratum model; when a new soil layer is piled up, the soil layer piled up in front is stable, and the height of the final soil layer after the soil layer is stable is consistent with that of the partition board (2);
step (3): the underground water is respectively injected into the first chamber (3) and the third chamber (5) through the water injection holes (11), and the water level and the hydraulic gradient of the two chambers are controlled to be consistent with the actual field through the pressure holes (13) according to the hydrogeological data of the polluted field; the first chamber (3) is an underground water upstream area, the third chamber (5) is an underground water downstream area, and the first chamber (3) and the third chamber (5) jointly form an underground water flow field model;
step (4): after the on-site stratum model and the underground water flow field model are stable, vertically inserting the injection equipment (7) into the soil layer from the top of the soil layer to a preset depth, determining the preset depth through past engineering implementation experience similar to the soil layer characteristics of the existing actual polluted site, slowly pulling out the sleeve (16), and compacting the soil layer to enable the injection equipment (7) to be buried to achieve a sealing effect;
step (5): preparing oxidant solution and activator solution with preset concentration in a solution barrel (8) and mixing the oxidant solution and the activator solution according to a certain proportion, wherein the currently adopted proportion method is to drill a polluted soil sample from the site, analyze the type, the concentration and the soil characteristics of the pollutants, and then carry out indoor small test to determine the oxidant and the activator type which are relatively excellent in degrading the pollutants in the soil and the concentration proportion parameter of the oxidant/activator;
step (6): communicating the injection device (7), the solution tank (8) and the pressurizing device (9) using a second pipe (18);
step (7): opening the pressurizing device (9), slowly increasing injection parameters such as injection pressure, injection flow rate and the like until reaching preset optimal parameter values, wherein the optimal parameter values refer to the conditions of migration and diffusion characteristics of the medicament in the model soil layer under different injection parameters according to comparative analysis, the injection parameters corresponding to the deepest diffusion depth and the largest diffusion radius are selected as the optimal injection parameters, the repairing medicament configured in the solution barrel (8) is continuously injected into the polluted soil layer through the second pipeline (18) and the injecting device (7), and the pressurizing device (9) is closed after reaching the required injection flow calculated according to a small test;
step (8): after the preset repair days are reached, measuring the pollutant concentration, the oxidant concentration and the ion concentration in soil layers and groundwater at different positions transversely and longitudinally from the injection point by using detection equipment, obtaining the change condition of spatial distribution diagrams of the soil layers and groundwater at different positions, analyzing the migration and diffusion characteristics of the repair agent in the three-dimensional soil layers, and obtaining the correlation corresponding relation between the migration and diffusion of the repair agent and an injection parameter system.
2. The method for studying the migration and diffusion of an in situ injected agent device in a soil layer according to claim 1, wherein: the injection device (7) comprises an injection pipe (14), a sleeve (16) and a pipe screen (15); a base (19) for penetrating into a soil layer is arranged at the bottom of the sleeve (16), and a plurality of holes are distributed on the pipe screen (15); the sleeve (16), the tube sieve (15) and the liquid injection tube (14) are sequentially arranged from outside to inside; one end of the liquid injection pipe (14) is connected with the second pipeline (18), and the other end of the liquid injection pipe is arranged on the base (19); the casing (16) and the screen (15) are connected to the base (19).
3. The method for studying the migration and diffusion of an in situ injected agent device in a soil layer according to claim 2, wherein: the base (19) is conical.
4. The method for studying the migration and diffusion of an in situ injected agent device in a soil layer according to claim 1, wherein: the material of the model box (1) is transparent PVC plastic.
5. The method for studying the migration and diffusion of an in situ injected agent device in a soil layer according to claim 1, wherein: the bottom of the solution barrel (8) is provided with an outflow hole (17), and the second pipeline (18) is connected with the outflow hole (17) at the bottom of the solution barrel (8).
6. The method for studying the migration and diffusion of an in situ injected agent device in a soil layer according to claim 5, wherein: the first pipeline (6) and the second pipeline (18) are made of transparent PE materials, and the aperture of the second pipeline (18) is consistent with the aperture of the interface of the outflow hole (17), the liquid injection pipe (14) and the pressurizing device (9).
7. The method for studying the migration and diffusion of an in situ injected agent device in a soil layer according to claim 1, wherein: the pressurizing device (9) is a peristaltic pump.
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| CN114705530A (en) * | 2022-03-23 | 2022-07-05 | 辽宁工程技术大学 | Test device for reinforcing soil mass based on MICP technology and use method |
| CN114888069B (en) * | 2022-04-14 | 2023-09-26 | 中交天航环保工程有限公司 | Point location design method for in-situ chemical oxidation remediation of polluted soil |
| CN114925533B (en) * | 2022-05-30 | 2024-06-14 | 大连理工大学 | Prediction method for influence radius of persulfate in underground water in-situ chemical oxidation system |
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