In-situ injection well device

Abstract

The utility model relates to the technical field of polluted land restoration, and discloses an in-situ injection well device. The in-situ injection well device comprises a well sleeve, a microbial strain box and a water injection assembly, at least one storage area is arranged in the well sleeve, and a permeable area is arranged at the position, corresponding to the storage area, of the wall of the well sleeve; a microbial strain box is arranged in each storage area; the water injection assembly is used for injecting fluid at the preset temperature into the storage area. According to the in-situ injection well device, the fluid with the preset temperature is provided for the storage area through the water injection assembly, the fluid with the preset temperature can degrade the microbial strain box to release microbial strains, and the fluid drives the microbial strains to move towards the water permeable area; further, directional release of microbial strains is achieved through the arrangement of the water permeable area, the coverage of the microbial strains and the microbial physiological activity at the specific temperature are ensured, the microbial strains can rapidly degrade target pollutants, and the remediation effect of the polluted land parcels is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of contaminated site remediation, and particularly relates to an in-situ injection well device. Background Art

[0002] In recent years, the remediation of contaminated sites has received increasing attention. There are various types of contaminated sites, and common contaminated sites include petroleum hydrocarbon contaminated sites, organic matter (including pesticide) contaminated sites, heavy metal contaminated sites, etc. Different remediation techniques and processes are adopted for different contaminated sites. Generally, chemical oxidation remediation processes can be used for petroleum hydrocarbon contaminated sites and organic matter (including pesticide) contaminated sites. The principle is to use chemical agents with high oxidation ability (such as Fenton, persulfate, permanganate) to oxidize petroleum hydrocarbons and organic matter. However, various intermediate products will be generated during the oxidation process, which is not conducive to the reuse of the site.

[0003] Microbial remediation technology has high superiority over traditional chemical oxidation remediation technology. Through the physiological activities of microorganisms, petroleum hydrocarbons and most organic matter can be biodegraded without secondary pollution. At present, the main microbial underground injection methods are injection wells or jet grouting injection. Microbial strains or solutions are configured on the ground surface and injected underground through injection wells or jet grouting equipment. In this injection method, it is difficult to control the application range during the underground injection of microbial strains, and it is difficult to ensure the effective biological activity of microbial strains in the underground environment. Summary of the Utility Model

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the utility model provides an in-situ injection well device.

[0005] The utility model provides an in-situ injection well device, including:

[0006] A well casing for inserting into the ground. At least one storage area is provided inside the well casing, and a water-permeable area is provided at a position corresponding to the storage area on the casing wall of the well casing.

[0007] At least one microbial strain box, and one microbial strain box is provided in each storage area.

[0008] A water injection assembly for injecting a fluid at a preset temperature towards the storage area.

[0009] Optionally, the in-situ injection well device further includes a lifting assembly. One end of the lifting assembly is connected to the microbial strain box, and the other end of the lifting assembly extends out of the top of the well casing.

[0010] Optionally, the lifting assembly includes a lifting rod connected to the microbial strain box.

[0011] Optionally, the in-situ injection well device further includes a clamping plate sleeved on the outer periphery of the lifting rod, and the outer periphery of the clamping plate is supported on the inner wall of the well casing.

[0012] Optionally, the water injection assembly includes a constant-temperature water storage tank for storing fluid and a water delivery pipe connected to the liquid outlet end of the constant-temperature water storage tank, and the water outlet end of the water delivery pipe extends into the placement area.

[0013] Optionally, the in-situ injection well device further includes a temperature measuring assembly for measuring the temperature of the fluid in the placement area.

[0014] Optionally, the constant-temperature water storage tank is configured to be able to adjust the temperature of the fluid in the constant-temperature water storage tank, and the constant-temperature water storage tank is electrically connected to the temperature measuring assembly.

[0015] Optionally, the temperature measuring assembly includes a temperature measuring probe extending into the placement area, and the temperature measuring probe is opposite to the position of the center line in the horizontal direction of the microbial strain box.

[0016] Optionally, a plurality of holes are formed in the water permeable area, and the hole opening rate of the water permeable area is 75-85%.

[0017] Optionally, the in-situ injection well device further includes a screen wrapped around the outer periphery of the water permeable area.

[0018] The technical solution provided by the embodiment of the present utility model has the following advantages compared with the prior art:

[0019] The in-situ injection well device provided by the present utility model supports the microbial strain box placed in the placement area near the underground pollution source through the well casing, provides a fluid with a preset temperature towards the placement area through the water injection assembly, the fluid with the preset temperature can degrade the microbial strain box and cause the microbial strain box to release microbial strains, the fluid will drive the microbial strains to move towards the water permeable area, and then the directional release of the microbial strains is realized through the opening of the water permeable area, so as to control the microbial strains within a certain range, ensure the coverage of the microbial strains and the microbial physiological activity at a specific temperature, enable the microbial strains to quickly degrade the target pollutants, and ensure the remediation effect of the polluted site. Description of the Drawings

[0020] The drawings here are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present utility model and used together with the specification to explain the principles of the present utility model.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of the in-situ injection well device described in the embodiment of the present invention.

[0023] Explanation of reference numerals

[0024] 1. Well casing; 11. Storage area; 12. Casing wall; 121. Water-permeable area; 1211. Hole; 2. Microbial strain box; 3. Water injection assembly; 31. Constant temperature water storage tank; 32. Water delivery pipe; 321. Ground pipe, 322. Built-in pipe; 4. Lifting assembly; 41. Lifting rod; 5. Clamping plate; 6. Temperature measurement assembly; 61. Temperature measurement probe; 62. Signal wire; 63. Temperature control box. Specific embodiments

[0025] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the following will further describe the solutions of the present invention. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0027] As Figure 1 shown, the in-situ injection well device provided by the embodiment of the present invention includes a well casing 1, at least one microbial strain box 2 and a water injection assembly 3.

[0028] The well casing 1 is used to be inserted into the ground. There is at least one storage area 11 inside the well casing 1, so that the storage area 11 can be supported near the underground pollution source through the well casing 1. A water-permeable area 121 is provided at a position corresponding to the storage area 11 on the wall 12 of the well casing 1. The fluid entering the storage area 11 can pass through the water-permeable area 121 and penetrate the wall 12 of the well casing 1. Each storage area 11 is provided with a microbial strain box 2. The microbial strain box 2 stores microbial strains, and the microbial strain box 2 is made of a heat-degradable material and can degrade at a preset temperature. The water injection assembly 3 is used to inject a fluid at a preset temperature towards the storage area 11, so that after the fluid at the preset temperature contacts the microbial strain box 2, the microbial strain box 2 can be degraded to release the microbial strains. Among them, the material of the microbial strain box 2 is not limited, as long as it can be naturally degraded at the preset temperature. The preset temperature here can be designed according to the type of microbial strains to ensure that the microbial strains can diffuse at a comfortable temperature and ensure the stability of diffusion. In some embodiments, the preset temperature here can be 25-30 °C. The microbial strain box 2 can be naturally degraded at 25-30 °C without pollution, and the microbial strains are stably diffused at this temperature.

[0029] When the in-situ injection well device designed in this way is in use, a fluid at a preset temperature is injected towards the storage area 11 through the water injection assembly 3. After the fluid at the preset temperature contacts the microbial strain box 2, the microbial strain box 2 can be degraded, so as to achieve the purpose of releasing the microbial strains. The released microbial strains flow towards the pollution source after following the fluid through the water-permeable area 121.

[0030] The in-situ injection well device provided by the present utility model supports the microbial strain box 2 placed in the storage area 11 near the underground pollution source through the well casing 1. A fluid at a preset temperature is provided towards the storage area 11 through the water injection assembly 3. The fluid at the preset temperature can degrade the microbial strain box 2 and cause the microbial strain box 2 to release the microbial strains. The fluid will drive the microbial strains to move towards the water-permeable area 121, and then the directional release of the microbial strains is realized through the opening of the water-permeable area 121, so as to control the microbial strains within a certain range, ensure the coverage of the microbial strains and the microbial physiological activity at a specific temperature, enable the microbial strains to quickly degrade the target pollutants, and ensure the remediation effect of the polluted land.

[0031] In some embodiments, when there is one pollution source, both the water-permeable area 121 and the storage area 11 can be one.

[0032] In other embodiments, if the underground pollution sources are distributed in different layers, both the water-permeable area 121 and the storage area 11 can correspondingly be multiple, increasing the remediation efficiency.

[0033] In some embodiments, the well casing 1 is cylindrical. The outer diameter of the well casing 1 is 200 mm, the inner diameter is 160 mm, and the wall thickness of the casing wall 12 is 20 mm. The overall material is cast iron to meet the layout requirements of the well casing 1. The well casing 1 is inserted below the ground, and the storage area 11 of the well casing 1 is located at the pollution source position to ensure that the microbial strains can repair the polluted position.

[0034] It can be understood that the size of the well casing 1 can be designed according to actual needs to meet the usage requirements under different conditions.

[0035] In some embodiments, the water permeable area 121 is located at the bottom end of the well casing 1, and there are four water permeable areas 121. The four water permeable areas 121 are arranged symmetrically in four directions. The area of a single water permeable area 121 is about 100 cm 2 , to meet the requirement for the fluid to pass through.

[0036] In some embodiments, with continued reference to Figure 1 , the in-situ injection well device further includes a lifting assembly 4. One end of the lifting assembly 4 is connected to the microbial strain box 2, and the other end of the lifting assembly 4 extends out of the top of the well casing 1.

[0037] Under this design, if the amount of microbial strains used at one time is insufficient, a new microbial strain box 2 can be manually replaced through the lifting assembly 4. The construction is relatively convenient, and the process helps to protect the underground soil layer structure.

[0038] In some embodiments, the lifting assembly 4 includes a lifting rod 41 connected to the microbial strain box 2. Among them, the lifting rod 41 is made of stainless steel to increase its service life. The design of the lifting rod 41 is convenient for the staff to operate and increases the convenience of operation.

[0039] In some embodiments, the in-situ injection well device further includes a clamping plate 5 sleeved on the outer periphery of the lifting rod 41. The outer periphery of the clamping plate 5 is supported on the inner wall of the well casing 1. Among them, the clamping plate 5 should be located below the stable groundwater level line. The clamping plate 5 plays a role in supporting and fixing the positions of the lifting rod 41 and the microbial strain box 2. In addition, the clamping plate 5 is also used as the top cover of the storage area 11 to prevent the fluid from flowing upward.

[0040] In some embodiments, the clamping plate 5 is made of rubber and is in a disc shape. The diameter of the clamping plate 5 is 160 mm and the thickness is 18 mm. The clamping plate 5 is tightly fixed to the lifting rod 41 and the signal line 62 of the temperature measuring component 6 to be able to limit the positions of the microbial strain box 2 and the temperature measuring probe 61.

[0041] In some embodiments, the water injection assembly 3 includes a constant temperature water storage tank 31 for storing fluid and a water delivery pipe 32 connected to the liquid outlet end of the constant temperature water storage tank 31. The water outlet end of the water delivery pipe 32 extends into the storage area 11. The fluid here can be clean water.

[0042] Among them, the constant-temperature water storage tank 31 is used to store the fluid at a preset temperature, and the constant-temperature water storage tank 31 is used to be installed on the ground. The water delivery pipe 32 includes a ground pipe 321 and an internal pipe 322. One end of the ground pipe 321 is communicated with the water outlet end of the constant-temperature water storage tank 31, the other end of the ground pipe 321 is communicated with the internal pipe 322, and one end of the internal pipe 322 far from the ground pipe 321 extends into the storage area 11. A water pump is built in the constant-temperature water storage tank 31 to provide power for pumping out the fluid in the constant-temperature water storage tank 31, so that the fluid can drive the microbial strains to flow into the groundwater. Among them, the number of the internal pipes 322 is not limited and can be designed according to actual needs.

[0043] In some embodiments, in order to ensure the fluid delivery efficiency, there may be multiple internal pipes 322. At this time, the ground pipe 321 on the ground is communicated with the multiple internal pipes 322, and the fluid can flow into the multiple internal pipes 322 through the ground pipe 321.

[0044] In some embodiments, the diameter of the internal pipe 322 is 10 mm, and the internal pipe 322 is arranged inside the sleeve wall 12 of the well sleeve 1, which is convenient for pipe arrangement and layout.

[0045] In some embodiments, as Figure 1 shown, the water outlet end of the internal pipe 322 points to the middle of the storage area 11 at an angle of 45°, and the vertical distance from the water outlet end of the internal pipe 322 to the inner wall of the well sleeve 1 is 15 mm. This design method is convenient for fluid injection.

[0046] In some embodiments, the in-situ injection well device further includes a temperature measuring component 6, and the temperature measuring component 6 is used to measure the temperature of the fluid in the storage area 11. By setting the temperature measuring component 6, the temperature of the fluid in the storage area 11 can be observed in real time to ensure that the microbial strains can flow with the fluid at the preset temperature.

[0047] In some embodiments, the constant-temperature water storage tank 31 is set to be able to adjust the temperature of the fluid in the constant-temperature water storage tank 31, and the constant-temperature water storage tank 31 is electrically connected to the temperature measuring component 6. Among them, the water temperature of the constant-temperature water storage tank 31 can be set according to requirements, and the temperature range can be 20-50 °C.

[0048] Under this design method, through the temperature feedback by the temperature measuring component 6, the constant-temperature water storage tank 31 can adjust the temperature of the fluid it delivers, so that the temperature in the storage area 11 is within the preset temperature range. This method of temperature measurement, feedback and adjustment is a mature technology, and its principle is not described in detail here.

[0049] In some embodiments, the temperature measurement component 6 includes a temperature measurement probe 61 extending into the storage area 11, and the position of the temperature measurement probe 61 is opposite to the center line of the microbial strain box 2 in the horizontal direction. Among them, the temperature measurement probe 61 is a conventional component for measuring the target temperature, and its structure and working principle are not described in detail here. Opposing the position of the temperature measurement probe 61 to the center line of the microbial strain box 2 in the horizontal direction can ensure the measurement of the intermediate temperature and improve the accuracy of temperature measurement.

[0050] In some embodiments, the temperature control component 6 further includes a temperature control box 63 disposed on the ground. The temperature control box 63 is connected to the temperature measurement probe 61 through a signal line 62. The signal line 62 passes through the above-mentioned clamping plate 5 and is fixedly connected to the clamping plate 5, so that the temperature measurement probe 61 can be supported at a specified position through the clamping plate 5. The temperature control box 63 can receive the temperature information fed back by the temperature measurement probe 61 and feed the temperature information back to the constant temperature water storage tank 31, and then the constant temperature water storage tank 31 adjusts the temperature.

[0051] In some embodiments, a plurality of holes 1211 are formed in the water permeable area 121, and the hole opening rate of the water permeable area 121 is 75-85%. Preferably, the hole opening rate of the water permeable area 121 is 80% to ensure the fluid flow effect.

[0052] In some embodiments, the in-situ injection well device further includes a screen wrapped around the outer periphery of the water permeable area 121. This design is applicable to the silty sand formation zone to prevent external impurities from entering the well casing 1. Among them, the screen can be 100 mesh and can be designed according to actual needs.

[0053] For the in-situ injection well device provided by the present utility model, before use, the in-situ injection well device needs to be laid out and constructed according to the actual situation of the polluted site (pollution depth, pollution area); the outer diameter of the constructed well casing 1 is not less than 200 mm; the water permeable area 121 is set according to the pollution depth; after the well construction is completed, the conveying temperature of the fluid is controlled according to the temperature measurement component 6 and the constant temperature water storage tank 31, and warm water is injected through the water delivery pipe 32 to release the microbial strains into the groundwater.

[0054] It should be noted that, in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0055] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments described herein, but rather to the broadest scope consistent with the principles and novel features of the utility model described herein.

Claims

1. An in-situ injection well device, characterized in that: include: A well casing (1) is used for being inserted into the ground, wherein at least one storage area (11) is provided inside the well casing (1), and a water-permeable area (121) is provided at a position of a casing wall (12) of the well casing (1) corresponding to the storage area (11); at least one microorganism seed box (2), each storage area (11) being provided with one microorganism seed box (2); The water injection assembly (3) is used to inject a fluid of a preset temperature toward the storage area (11).

2. The in-situ injection well device according to claim 1, characterized in that: The in-situ injection well device further comprises a lifting assembly (4), one end of which is connected to the microbial strain box (2), and the other end of which extends out of the top of the well casing (1).

3. The in-situ injection well device according to claim 2, characterized in that: The lifting assembly (4) comprises a lifting rod (41) connected to the microorganism seed box (2).

4. The in-situ injection well device according to claim 3, characterized in that: The in-situ injection well device further comprises a clamping plate (5) sleeved on the outer periphery of the lifting rod (41), and the outer periphery of the clamping plate (5) is supported on the inner wall of the well casing (1).

5. The in-situ injection well device according to claim 1, characterized in that: The water injection assembly (3) comprises a constant temperature water storage tank (31) for storing fluid and a water delivery pipe (32) connected to the liquid outlet end of the constant temperature water storage tank (31), and the water outlet end of the water delivery pipe (32) extends into the storage area (11).

6. The in-situ injection well device according to claim 5, characterized in that: The in-situ injection well device further comprises a temperature measuring component (6), wherein the temperature measuring component (6) is used to measure the temperature of the fluid in the storage area (11).

7. The in-situ injection well device according to claim 6, characterized in that: The constant temperature water storage tank (31) is configured to be able to adjust the temperature of the fluid in the constant temperature water storage tank (31), and the constant temperature water storage tank (31) is electrically connected to the temperature measuring component (6).

8. The in-situ injection well device according to claim 6, characterized in that: The temperature measuring component (6) comprises a temperature measuring probe (61) extending into the storage area (11), and the temperature measuring probe (61) is located opposite to the center line of the microorganism culture box (2) in the horizontal direction.

9. The in-situ injection well device according to claim 1, characterized in that: The water permeable area (121) is provided with a plurality of holes (1211), and the opening rate of the water permeable area (121) is 75-85%.

10. The in-situ injection well device according to claim 1, characterized in that: The in-situ injection well device further comprises a screen, which is wrapped around the outer periphery of the permeable area (121).

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