Underground injection well device with plug-in microorganism rods

Abstract

The utility model discloses a plug-in microorganism rod underground injection well device. The plug-in microorganism rod underground injection well device comprises an injection well pipe; the injection well pipe is provided with a pipe outer wall and a pipe inner wall which are coaxially arranged, an annular well outer cavity with a closed bottom is formed between the pipe outer wall and the pipe inner wall, and an instant-insertion microorganism rod is inserted into the annular well outer cavity; a well pipe inner cavity with a closed bottom is formed in the pipe inner wall, a well pipe inner interlayer is arranged in the well pipe inner cavity, and sieve pore areas are arranged on the pipe outer wall section and the pipe inner wall section below the well pipe inner interlayer; a water injection pipe is arranged on the interlayer in the well pipe in a penetrating manner, water / air through holes which are communicated up and down are formed in the interlayer in the well pipe, and a gas injection pipe is arranged in the inner cavity of the well pipe above the interlayer in the well pipe. According to the in-situ remediation device, solution can be injected into the sieve pore area through the water injection pipe, and a microbial agent attached to the plug-in microbial rod is scoured and released into the environment around the well, so that in-situ remediation of a pollution source to be remedied around the well is realized; and meanwhile, secondary pressurization in the well can be further achieved through the gas injection pipe, and the release range of the microbial agent is ensured.

Description

Technical Field

[0001] The utility model relates to the field of microbial remediation of contaminated sites, in particular to an underground microbial stick injection well device. Background Art

[0002] According to relevant research, large-scale organic contaminated sites, posing safety or environmental risks from excavation pits, often undergo in-situ remediation or pollution reduction. A common in-situ remediation technique in China is in-situ injection remediation, which requires the use of an injection well.

[0003] Common agents used to remediate underground organic contamination include persulfate, permanganate, and Fenton's reagent. However, these agents produce excessive byproducts during application, which can damage the soil microenvironment. Therefore, microbial in situ injection remediation technology is more environmentally competitive. Therefore, an injection well device suitable for in situ microbial injection is urgently needed. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an underground microbial stick injection well device.

[0005] The utility model discloses an underground microbial stick injection well device, comprising: an injection well pipe;

[0006] The injection well pipe has a coaxially arranged outer wall and inner wall, a bottom-closed annular well cavity is formed between the outer wall and the inner wall, and a microbial stick is inserted into the annular well cavity; a bottom-closed well cavity is formed in the inner wall, and a well inner barrier is provided in the well inner cavity, and the well inner barrier is located above the pollution source to be repaired;

[0007] The outer wall section and the inner wall section below the inner partition of the well pipe are provided with a sieve hole area, and the outer wall section and the inner wall section above the inner partition of the well pipe are solid sections; a water injection pipe is passed through the inner partition of the well pipe, the upper end of the water injection pipe is connected to the external liquid injection system, and the lower end is placed in the inner cavity of the well pipe below the inner partition of the well pipe, and the inner partition of the well pipe is provided with water / air holes connected up and down, and an air injection pipe is provided in the inner cavity of the well pipe above the inner partition of the well pipe, and the air injection pipe is connected to the external air injection system.

[0008] As a further improvement of the utility model, it also includes: a well liquid level meter;

[0009] The in-well liquid level gauge is located in the inner cavity of the well pipe above the inner barrier of the well pipe, and the in-well liquid level gauge is connected to the external water level detection central control system; the water level detection central control system is connected to the injection system and the gas injection system, and is used to control the injection system to stop injection and start the gas injection system to inject gas into the well when the water level detection injected into the well pipe reaches a preset value.

[0010] As a further improvement of the present invention, a sealing well cap is provided at the wellhead of the injection well pipe, and the well level gauge, water injection pipe and gas injection pipe pass through the sealing well cap.

[0011] As a further improvement of the present invention, the plug-in microbial stick is composed of an upper solid stick and a lower microbial attachment stick. The lower microbial attachment stick is placed in the annular outer well cavity below the inner barrier of the well pipe. The lower microbial attachment stick is in the shape of a multi-porous mesh and is filled with microbial agents.

[0012] As a further improvement of the present invention, the inner barrier layer of the well pipe is lower than the stable groundwater level.

[0013] As a further improvement of the present invention, the injection well pipe is made of 304 stainless steel.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] When the utility model is in use, a solution can be injected into the sieve hole area through the water injection pipe, and the microbial agent attached to the plug-in microbial stick is flushed and released into the environment around the well, so as to achieve in-situ repair of the pollution source to be repaired around the well; at the same time, the well can be further pressurized twice through the air injection pipe to ensure the release range of the microbial agent;

[0016] The plug-in microorganism stick of the utility model can be replaced at any time according to the usage situation, ensuring the use of microbial strains on demand;

[0017] The overall material of the utility model is 304 stainless steel, which can be recycled and reused, and has no pollution to the underground environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a longitudinal cross-sectional schematic diagram of the plug-in microbial stick underground injection well device disclosed in the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the front cross section of the injection well pipe;

[0020] Figure 3 for Figure 1 Schematic diagram of the top view of the injection well pipe.

[0021] In the picture:

[0022] 1-Injection well pipe; 11-Outer wall of the pipe; 12-Inner wall of the pipe; 13-Annular outer cavity of the well; 14-Inner cavity of the well pipe; 15-Inner partition of the well pipe; 16-Water / air hole; 17-Sieve hole area; 2-Plug-in microbial stick; 21-Upper end solid stick; 22-Lower end microbial attachment stick; 3-Water injection pipe; 4-Inner well liquid level gauge; 5-Gas injection pipe; 6-Sealed well cap; 7-Concrete well platform; 31-Liquid injection system; 41-Water level detection and control system; 51-Gas injection system. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] The present invention is described in further detail below with reference to the accompanying drawings:

[0025] like Figures 1 to 3 As shown, the utility model provides an underground microbial stick injection well device, comprising: an injection well pipe 1, a microbial stick 2, a water injection pipe 3, a well level gauge 4, an air injection pipe 5, a sealing well cap 6, a liquid injection system 31, a water level detection central control system 41 and an air injection system 51; wherein,

[0026] The injection well pipe 1 of the present invention has a coaxially arranged outer wall 11 and an inner wall 12, a bottom-closed annular outer well cavity 13 is formed between the outer wall 11 and the inner wall 12, a bottom-closed well pipe inner cavity 14 is formed in the inner wall 12, a well pipe inner barrier 15 is provided in the well pipe inner cavity 14, the well pipe inner barrier 15 is located above the pollution source to be repaired and below the stable groundwater level; the outer wall section and the inner wall section below the well pipe inner barrier 15 are provided with a sieve hole area 16, the outer wall section and the inner wall section above the well pipe inner barrier 15 are solid sections, and the well pipe inner barrier 15 is provided with a water injection pipe hole and a water / air vent 16 connected up and down.

[0027] Specifically:

[0028] The injection well pipe 1 is a square column of 304 stainless steel, the outer wall 11 of the pipe is 170mm long, 170mm wide and 18mm thick, the inner wall 12 of the pipe is 100mm long, 100mm wide and 20mm thick, the square ring type outer cavity 13 is between the outer wall 11 and the inner wall 12 of the pipe, the cavity is 20mm thick, the outer wall 11 and the inner wall 12 of the pipe are connected at the bottom, the bottom is 20mm thick, the inner cavity 14 of the well pipe is 68mm long and 68mm wide, the inner layer 15 of the well pipe is 25cm thick, the inner layer 15 of the well pipe is connected with the inner wall of the pipe, the inner layer 15 of the well pipe is 1m below the stable underground water level line, the center of the inner layer 15 of the well pipe is a water injection pipe insertion port with a radius of 6mm, eight water / gas passing holes 16 with a radius of 2mm are symmetrically arranged around the insertion port, the construction depth is determined according to the microbial adding depth of the contaminated site, the screen hole area 17 is symmetrically arranged on four sides and has an opening rate of 35%, the screen hole area 17 is located at the underground microbial adding position, and the height of the screen hole area 17 at the bottom of the well pipe is preferably 5-10m.

[0029] The utility model discloses a plug-in microbial stick 2 is inserted in the ring type outer cavity 13, specifically, the plug-in microbial stick 2 is a square ring type column, the outside is 130mm long, 130mm wide and 16mm thick, is composed of the upper end solid stick 21 and lower end microbial attachment stick 22, the plug-in microbial stick 2 is directly inserted into the square ring type outer cavity 13, the lower end microbial attachment stick 22 is in the same horizontal area with the well pipe bottom screen hole area 17, the lower end microbial attachment stick 22 is filled with microbial agent, the stick body is microporous net, about 1kg of microbial powder agent can be filled in every meter of attachment stick, the plug-in microbial stick 2 can be replaced at any time according to the use condition.

[0030] The utility model discloses a water injection pipe 3 is from top to bottom through the well pipe inner layer 15, the upper end of water injection pipe 3 is connected with external injection system 31, the lower end is placed in the well pipe inner cavity 14 below the well pipe inner layer 15, is equipped with the well liquid level meter 4 and the gas injection pipe 5 in the well pipe inner cavity above the well pipe inner layer 15, the well liquid level meter 4 is connected with external water level detection central control system 41, the gas injection pipe 5 is connected with external gas injection system 51. Specifically: water injection pipe 3 is a circular tube, the outer diameter is 10-30mm, the water outlet end of its bottom is 20cm from the well bottom, and the water outlet is located in the well pipe bottom screen hole area 17; the well liquid level meter 4 is located at the top of the well pipe inner cavity 14, and the vertical distance between the liquid level probe and the ground surface line is 0.5m; the gas injection pipe 5 is a circular tube, is located at the top of the well pipe inner cavity 14, the outer diameter is 6-10mm, and the vertical distance between the gas outlet and the ground surface line is 0.3m. Water level detection central control system 41 is connected with injection system 31 and gas injection system 51, and is used for controlling injection system 31 to stop injecting liquid when the water level detected in the injection well pipe reaches the preset value, and starting gas injection system 51 to inject gas in the well. Further, the ground injection system 31 controls the liquid injection pressure to be 1.5Mpa, and the gas injection system 51 controls the air injection pressure to be 2Mpa.

[0031] The utility model constructs a concrete well platform 7 on the surface of the injection well pipe 1, and the well platform size is 20×20×10cm; a sealing well cap 6 is provided at the wellhead of the injection well pipe 1, and the sealing well cap 6 is inserted into the water injection pipe 3, the well liquid level meter 4, and the air injection pipe 5, and is tightly connected to the injection well pipe 1, with strong air tightness, and is 0.5m away from the surface line.

[0032] The method of using the utility model includes:

[0033] S1. Before application, the depth of the injection well pipe should be designed according to the pollution situation of the polluted land; the number of wells to be built should be designed according to the hydrogeological conditions; and the height of the sieve area, the height of the lower end microbial attachment rod, and the height of the well pipe lumen should be designed according to the thickness of the underground pollution layer;

[0034] S2, when applying, after the injection well pipe 1 is constructed, the plug-in microbial stick 2 is placed in and the water injection pipe 3, the well level gauge 4, the air injection pipe 5, the sealing well cap 6 and the like are airtightly connected;

[0035] S3, when in use, the surface injection system 31 is first operated, and the solution is injected into the sieve area 17 at the bottom of the well pipe through the water injection pipe 3; the solution flows upward into the water / air vent 16 to the well level gauge 4;

[0036] S4. Water level detection The central control system 41 monitors the water level. When the water level reaches the set value, a feedback signal is sent to the gas injection system 51 to perform gas injection operation in the well.

[0037] Example:

[0038] At a vinyl chloride contaminated site in Jiangsu Province, investigations revealed that the groundwater contamination depth was 5-8m below the surface, with a contaminated area of ​​approximately 3,000m2. The strata were mainly silty clay, and the stable groundwater level was 1.5m.

[0039] During the remediation period, 20 wells were constructed using this new device, with a depth of 9 meters. The sieve area was set at a height of 4 meters, located 5-9 meters below the surface. The internal barrier layer of the well pipe was located 4.75-5 meters below the surface. The remediation work for this plot lasted two years, during which time the device replaced 10 batches of plug-in microbial sticks. The groundwater treatment effect was significant, and the device has proven effective.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A plug-in microbial stick underground injection well device, characterized in that: include: Injection well pipe; The injection well pipe has a coaxially arranged outer wall and inner wall, a bottom-closed annular well cavity is formed between the outer wall and the inner wall, and a microbial stick is inserted into the annular well cavity; a bottom-closed well cavity is formed in the inner wall, and a well inner barrier is provided in the well inner cavity, and the well inner barrier is located above the pollution source to be repaired; The outer wall section and the inner wall section below the inner partition of the well pipe are provided with a sieve hole area, and the outer wall section and the inner wall section above the inner partition of the well pipe are solid sections; a water injection pipe is passed through the inner partition of the well pipe, the upper end of the water injection pipe is connected to the external liquid injection system, and the lower end is placed in the inner cavity of the well pipe below the inner partition of the well pipe, and the inner partition of the well pipe is provided with water / air holes connected up and down, and an air injection pipe is provided in the inner cavity of the well pipe above the inner partition of the well pipe, and the air injection pipe is connected to the external air injection system.

2. The plug-in microbial stick underground injection well device according to claim 1, characterized in that: Also includes: Well level gauge; The in-well liquid level gauge is located in the inner cavity of the well pipe above the inner barrier of the well pipe, and the in-well liquid level gauge is connected to the external water level detection central control system; the water level detection central control system is connected to the injection system and the gas injection system, and is used to control the injection system to stop injection and start the gas injection system to inject gas into the well when the water level detection injected into the well pipe reaches a preset value.

3. The plug-in microbial stick underground injection well device according to claim 2, characterized in that: A sealing well cap is provided at the wellhead of the injection well pipe, and the well level gauge, water injection pipe and gas injection pipe pass through the sealing well cap.

4. The plug-in microbial stick underground injection well device according to claim 1, characterized in that: The plug-in microbial stick consists of an upper solid stick and a lower microbial attachment stick. The lower microbial attachment stick is placed in the annular outer well cavity below the inner barrier of the well pipe. The lower microbial attachment stick is in a multi-microporous mesh shape and is filled with microbial inoculants.

5. The plug-in microbial stick underground injection well device according to claim 1, characterized in that: The inner barrier layer of the well pipe is lower than the stable groundwater level.

6. The plug-in microbial stick underground injection well device according to claim 1, characterized in that: The injection well pipe is made of 304 stainless steel.

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