Inserting and pressing integrated repair method for site groundwater pollution repair

Abstract

The invention discloses an insertion and pressing integrated remediation method for site groundwater pollution remediation, and belongs to the technical field of pollution remediation. The method comprises the following steps that S1, ditching is conducted, specifically, two first ditches are formed in the two sides of a polluted farmland, and a second ditch is formed between the two first ditches; s2, belt insertion: a plurality of drainage belts are inserted in the width direction of the farmland, and the two ends of the drainage belts are arranged in the first ditches respectively; and S3, liquid absorption is conducted, specifically, under the action of the gravity of farmland soil, the water drainage belt conveys the remediation liquid in the second ditch into the two first ditches. The permeability of the argillaceous silty-fine sand can be enhanced, and the repairing radius can be enlarged.

Description

Technical Field

[0001] The present invention relates to the technical field of pollution remediation, and in particular to an integrated plug-and-press remediation method for site groundwater pollution remediation. Background Art

[0002] The in-situ restoration goal of the "North China Agricultural Irrigation Area" is to achieve the sustainability of agricultural production and the restoration of the ecological environment in the region by restoring ecological functions, improving water resource utilization efficiency, and promoting green agricultural development.

[0003] Considering the geological structure (muddy silt and fine sand), particle size distribution and low-porosity and low-permeability rock and soil properties of the aquifer in the North China agricultural irrigation area, the existing remediation technology has a small diffusion radius of the remediation agent when repairing weak permeability formations, and the remediation agent / remediation material is not mixed evenly with pollutants, resulting in incomplete remediation and unsatisfactory results. Summary of the invention

[0004] In view of this, it is necessary to provide an integrated plug-and-press repair method for site groundwater pollution remediation to solve the problem of low permeability of the stratum structure in North China and unsatisfactory repair effect.

[0005] The present invention provides an integrated plug-and-press repair method for groundwater pollution repair on site, comprising the following steps:

[0006] S1: digging ditches, two first ditches are dug on both sides of the polluted farmland, and a second ditch is dug in the middle of the two first ditches;

[0007] S2: inserting a plurality of drainage belts along the width direction of the farmland, wherein both ends of the drainage belts are respectively arranged in the first ditch;

[0008] S3: Absorbing liquid. Under the action of the gravity of the farmland soil, the drainage belt transports the repair liquid in the second ditch to the two first ditches to enhance the permeability of the muddy silt sand and expand the repair radius.

[0009] Furthermore, the drainage belt is horizontally inserted into the farmland by a horizontal drilling machine.

[0010] Further, the horizontal drilling machine works according to the following steps:

[0011] T1: Directional drilling, the horizontal drilling machine is advanced underground in the farmland in the correct direction and angle with the assistance of the guidance system control system;

[0012] T2: Drilling and cutting: the horizontal drilling machine uses the drill bit to cut the muddy silt and fine sand layer, and sprays drilling fluid into the soil layer to help cool the drill bit, reduce friction, and prevent the drill bit from overheating;

[0013] T3: Pull back and insert the drainage belt. When the drill bit comes out from the other side of the farmland, confirm that the hole diameter is compatible with the drainage belt, connect the drilling equipment to the drainage belt, pull back the drilling equipment, and insert the drainage belt into the drilled hole.

[0014] Furthermore, it also includes T4: a liquid return process. In the liquid return process, the second ditch is connected to the two first ditches through a water pump, and the water pump can extract the repair liquid from the first ditch and transport it back to the first ditch.

[0015] Furthermore, the middle portion of the drainage belt is relatively horizontally arranged, and both ends of the drainage belt are bent relative to the first ditch.

[0016] Furthermore, a plurality of the drainage belts are in contact with the second ditch to absorb the repair fluid in the second ditch.

[0017] Furthermore, a plurality of the drainage belts are arranged in an array on the cross section of the farmland.

[0018] Furthermore, the drainage belt is a permeable drainage belt, which is provided with a plurality of small holes and a water channel connected to the small holes. The drainage belt can absorb moisture in the soil layer through the small holes and transport the moisture using the water channel.

[0019] Furthermore, a first waterproof layer is provided in the first ditch, and the first waterproof layer can prevent the repair liquid from penetrating the side and bottom of the first ditch.

[0020] Furthermore, a second waterproof layer is provided in the second ditch, and the bottom of the second waterproof layer is relatively open. The second waterproof layer can prevent the repair fluid from penetrating the side of the second ditch.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides an integrated insertion and pressure repair method for site groundwater pollution remediation. Through a horizontal drilling machine, a drainage belt is horizontally inserted into the contaminated soil layer of the farmland. The drainage belt can automatically absorb and transport the repair liquid, enhance the permeability of muddy silt and fine sand, and expand the effective radius of the repair agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 is a flow chart of the method of the present invention;

[0025] Figure 2It is a flow chart of the use of the horizontal drilling machine in the present invention;

[0026] Figure 3 is a schematic cross-sectional view of a farmland in the present invention;

[0027] Figure 4 It is a top view schematic diagram of the farmland in the present invention.

[0028] In the figure, 100, farmland; 200, first ditch; 300, second ditch; 400, dewatering belt; 500, water pump. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0030] See also Figures 1 to 4 In this embodiment, a plug-and-press integrated remediation method for site groundwater pollution remediation is used. Through a horizontal drilling machine, a drainage belt is horizontally inserted into the contaminated soil layer of the farmland 100. The drainage belt can automatically absorb and transport the remediation liquid, enhance the permeability of the muddy silt and fine sand, and expand the effective radius of the remediation agent.

[0031] In this embodiment, a plug-and-press integrated repair method for groundwater pollution remediation at a site includes the following steps:

[0032] S1: Digging ditches. A first ditch 200 is dug on both sides of the polluted farmland 100. A second ditch 300 is dug between the two first ditches 200. The three ditches are parallel to each other and spaced apart from each other. The ditches can store repair fluid so that the repair fluid can cover the entire farmland 100 along the ditches, thereby assisting the subsequent drainage belt in pumping out the repair fluid.

[0033] S2: Inserting strips, uniformly insert multiple drainage strips along the width direction of the farmland 100. The drainage strips guide the flow of liquid in the soil and can effectively expand the spread range of the repair liquid. The two ends of the drainage strips are respectively set in the first ditch 200 to ensure that the liquid can flow in and be transmitted at different locations.

[0034] S3: By inserting drainage belts and using soil gravity to transport the repair fluid to the two first ditches 200, the drainage belts can effectively improve the permeability of the soil, helping the repair fluid to penetrate deep into the ground and be evenly distributed. For low-porosity and low-permeability muddy fine sand formations, the drainage belts can enhance liquid flow, break the hydraulic barrier of the formation, and significantly increase the penetration depth and coverage of the repair fluid.

[0035] S4: Liquid absorption: Under the gravity of the soil, the repair liquid in the second ditch 300 is naturally transported to the two first ditches 200 through the drainage belt. Under the condition of poor soil permeability, the drainage belt will enhance the soil permeability and help the repair liquid penetrate deeper into the underground, thereby expanding the repair radius and increasing the effective coverage area of ​​the repair agent.

[0036] The repair liquid flows along the drainage belt between the second ditch 300 and the first ditch 200, and the infiltration path of the repair liquid in the soil is more extensive and diverse. During the flow of the liquid, it can not only directly act on the pollutants, but also drive the microstructural changes of the surrounding soil, further promoting the diffusion of the repair agent. The method of circulating injection and extraction with the help of the drainage belt can expand the repair radius to a certain extent, ensure that more contaminated areas are covered by the repair agent, and avoid the problem of uneven repair.

[0037] Liquid return: the water pump 500 extracts the repair liquid in the second ditch 300 and transports it back to the first ditch 200. This step allows the repair liquid to flow continuously through reverse flow, forming a cycle and enhancing the repair effect on the soil.

[0038] It should be noted that due to the poor permeability of the muddy silt sand layer, the traditional injection method of the repair fluid is usually ineffective. However, this solution, by combining trenching, belt insertion and liquid return, utilizes the soil gravity and liquid circulation to effectively promote the deep diffusion of the repair agent in the soil. It not only solves the problem of poor permeability, but also avoids the local accumulation of the repair agent in the soil, ensuring the uniformity and comprehensiveness of the repair effect.

[0039] In some embodiments, the drainage belt is horizontally inserted into the farmland 100 by a horizontal drilling machine. The horizontal drilling machine can accurately control the buried depth and position of the drainage belt in the stratum, avoiding the unevenness and deviation caused by the traditional manual trenching method. It is particularly important to the permeability and repair needs of different layers in the soil of the farmland 100, and can ensure that the drainage belt is evenly distributed in the contaminated area that needs to be repaired. The horizontal drilling machine inserts the drainage belt through parallel strata to form a new liquid flow path. Compared with the traditional vertical injection method, horizontal insertion can effectively expand the contact area of ​​the permeable surface, promote a wider range of diffusion of the repair liquid in the soil, and increase the contact opportunity between the repair liquid and the pollutants.

[0040] During use, the following steps are included:

[0041] T1: Directional Drilling

[0042] Guide Drill Rod: The drill bit of the drilling machine is first driven into the ground by the main engine of the drilling machine to produce a hole underground. At this time, the direction of the drill bit is accurately set by the control system, which can ensure that the drill bit can drill in a directional manner according to the specified depth and direction.

[0043] Guidance system: The guidance system of the drilling machine is usually composed of lasers, gyroscopes and other sensors, which can monitor the depth, position, direction and drilling path of the drill bit in real time. Through this precise guidance control, it can ensure that the drill bit is advanced in the correct direction and angle to avoid deviating from the established route.

[0044] T2: Drilling and cutting

[0045] Drilling fluid: When the drilling machine is working, water or other drilling fluids (such as mud) are usually used to help cool the drill bit, reduce friction, prevent the drill bit from overheating, and also take away the debris generated during the drilling process. The drilling fluid keeps flowing in the borehole, takes the debris out of the ground, and keeps the borehole stable.

[0046] Drill bit cutting: The front end of the drill bit is designed with cutting tools, which can effectively break the soil or rock, allowing the drill bit to continue to advance underground. Depending on the geological layer, the drill bit can cut different soil types (such as sand, clay, gravel, etc.).

[0047] T3: Pull back the tape

[0048] When the drill comes out of the other side of the field 100, confirming that the hole is complete and the hole diameter is suitable for the pipe or drainage tape, the next step is to pull the pipe or drainage tape back into the drilled hole. To achieve this, the drilling machine connects the drainage tape or pipe to the drilling equipment through a wire rope or cable and pulls it back into the drilled hole by pulling. The drainage tape is gradually pulled back into the ground through this process and installed at the predetermined depth and position. This step ensures that the pipe is completely laid underground and adapts to the natural structure of the soil without causing serious disturbance to the surface land.

[0049] The main advantage of the horizontal drilling machine is that it does not require large-scale excavation of the ground, reducing the disturbance of the ground surface and avoiding serious damage to farmland 100 or urban roads. In this way, underground repairs can be carried out without affecting the growth of crops in the farmland 100.

[0050] In some embodiments, see Figure 3 The middle part of the drainage belt is relatively horizontally set. The drainage belt is located in the middle section and is laid horizontally. It can absorb the repair fluid under the action of gravity, drive the repair fluid to move along the radial and axial direction of the drainage belt, evenly expand the penetration range of the repair fluid, and increase the permeability of the soil.

[0051] The horizontal part of the drainage belt in the middle can ensure the stability and uniformity of liquid flow, avoid excessive concentration or deviation of the liquid in a certain direction, and thus increase the penetration depth and diffusion radius of the repair liquid in the soil.

[0052] If the drain strip is completely vertical or unbalanced, the repair fluid may be concentrated at a certain point, resulting in increased permeability in one part and insufficient permeability in other parts. Setting the drain strip horizontally can reduce this problem to a certain extent, allowing the repair fluid to spread evenly along the drain strip, ensuring that the repair effect is balanced throughout the entire area.

[0053] The two ends of the drainage belt are bent relative to the two first ditches 200, which can make the distribution of the repair liquid more uniform. Through the bending setting, the drainage belt can form multiple water flow convergence points at different positions of the soil to promote the diffusion of the repair liquid. Especially in low-permeability soils such as muddy fine sand, the flow of liquid is limited, and the bending design can help the repair liquid change its flow direction and improve the effect of the repair agent spreading in the soil.

[0054] As a further implementation, multiple drainage belts are in contact with the second ditch 300, and the depth of the second ditch 300 is substantially consistent with the insertion depth of the drainage belt. The drainage belt can more effectively absorb the repair liquid in the ditch and drive the repair liquid to move along the drainage belt, so that the repair liquid can be evenly distributed in the drainage belt and then penetrate into the surrounding soil to cover a wider range of polluted areas. The contact between the drainage belt and the second ditch 300 ensures that the repair liquid not only flows on the soil surface, but also penetrates deeply to reach deeper pollution levels, thereby expanding the scope and depth of repair.

[0055] The repair liquid in the second ditch 300 is absorbed and transported to the soil through the drainage belt, thereby forming a continuous liquid flow channel, ensuring a continuous supply of repair liquid, avoiding liquid flow interruption or concentration reduction, and making the repair process more stable and long-lasting.

[0056] Over time, the soil may gradually consume the active ingredients in the repair solution, resulting in a gradual reduction in the repair effect. The contact between the drainage belt and the ditch allows the repair solution to be continuously replenished, ensuring that the concentration of the repair agent is always maintained within the effective range, thereby prolonging the repair effect.

[0057] In some embodiments, multiple drainage belts are arranged in an array on the cross section of the farmland 100. By arranging the drainage belts evenly in an array, the repair liquid can cover a wider soil area, thereby increasing the contact opportunity between the liquid and the pollutants in the soil. Multiple drainage belts arranged in an array can promote uniform penetration of the repair liquid, avoid local excess or deficiency, and ensure that the pollutants in the entire area are fully repaired.

[0058] The array arrangement of multiple drainage strips on the cross section of the farmland 100 can accelerate the penetration and distribution of the repair liquid, so that the repair liquid can cover the entire repair area, avoiding poor repair effects in certain areas or uneven liquid flow.

[0059] In some embodiments, the drainage belt is a permeable drainage belt, and the material of the drainage belt is usually selected to be corrosion-resistant, wear-resistant, and has strong compression and tensile resistance, generally polyvinyl chloride (PVC), polyethylene (PE), high-density polyethylene (HDPE), polypropylene (PP) or EPDM rubber. The drainage belt is provided with a plurality of small holes and water guide grooves connected to the small holes.

[0060] The setting of small holes increases the surface area for water absorption. The setting of multiple small holes greatly increases the water absorption area of ​​the drainage belt, so that the drainage belt can absorb water from the surrounding soil more efficiently. The small holes provide more entrances, and liquid can more easily penetrate into the drainage belt through these pores, especially in areas where the soil is moist or pollutants accumulate, which can accelerate the absorption of water.

[0061] The long-term use of drainage tape will improve the overall moisture management and permeability of the soil. The repair fluid and water will continuously enter the soil through the small holes, activating the originally compacted areas in the soil, gradually improving its permeability, and enhancing the soil's ability to absorb water and repair fluid, thereby improving the soil's self-repairing ability.

[0062] The setting of the water guide trough means that the flow of water in the drainage belt is no longer limited by the local penetration of small holes, but can expand rapidly along the water flow path inside the drainage belt, which helps to increase the distribution range of the repair fluid, especially in low-permeability soils, and can promote the repair fluid to penetrate deeper into the soil.

[0063] In some embodiments, a first waterproof layer is provided in the first ditch 200, and the first waterproof layer can cover the entire ditch to form a waterproof layer. The first waterproof layer effectively blocks the penetration of the repair liquid in the sides and bottom of the ditch, ensuring that the repair liquid can be kept inside the ditch to prevent liquid leakage. The repair liquid can be concentrated in the ditch, ensuring that it flows along a predetermined path and enters the drainage belt or soil for repair, maximizing the utilization efficiency of the liquid.

[0064] Without a waterproof layer, the repair fluid may penetrate into the groundwater or surrounding soil through the bottom or side of the ditch, resulting in a waste of repair fluid. The first waterproof layer can effectively prevent this from happening, ensuring that the repair fluid will not be lost, and can be centrally stored in the ditch and re-introduced into the drainage belt or soil to maximize the repair effect.

[0065] In the specific implementation process, the first waterproof layer is HDPE geomembrane or PVC waterproof cloth, both of which have very high anti-penetration performance and long service life.

[0066] In some embodiments, a second waterproof layer is provided in the second ditch 300, and the bottom of the second waterproof layer is relatively open. The second waterproof layer can block the penetration of the repair liquid from the side of the ditch, so that the repair liquid remains inside the ditch and can only penetrate downward, thereby better penetrating into the soil layer that needs to be repaired. This directional penetration method can improve the efficiency of the repair liquid contacting with the pollutant, thereby enhancing the repair effect.

[0067] In the specific implementation process, the second waterproof layer is a HDPE geomembrane or a PVC waterproof cloth, both of which have very high anti-penetration performance and a long service life. The HDPE geomembrane or the PVC waterproof cloth at the bottom of the ditch is cut so that the bottom cut is relatively exposed.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. A plug-and-press integrated remediation method for site groundwater pollution remediation, characterized in that: The following steps are involved: S1: digging ditches, two first ditches are dug on both sides of the polluted farmland, and a second ditch is dug in the middle of the two first ditches; S2: inserting a plurality of drainage belts along the width direction of the farmland, with both ends of the drainage belts being respectively arranged in the first ditch; S3: Absorbing liquid. Under the action of the gravity of the farmland soil, the drainage belt transports the repair liquid in the second ditch to the two first ditches to enhance the permeability of the muddy silt sand and expand the repair radius.

2. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 1 is characterized in that: The drainage belt is horizontally inserted into the farmland by a horizontal drilling machine.

3. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 2 is characterized in that: The horizontal drilling machine works according to the following steps: T1: Directional drilling, the horizontal drilling machine is advanced underground in the farmland in the correct direction and angle with the assistance of the guidance system control system; T2: Drilling and cutting: the horizontal drilling machine uses the drill bit to cut the muddy silt and fine sand layer, and sprays drilling fluid into the soil layer to help cool the drill bit, reduce friction, and prevent the drill bit from overheating; T3: Pull back and insert the drainage belt. When the drill bit comes out from the other side of the farmland, confirm that the hole diameter is compatible with the drainage belt, connect the drilling equipment to the drainage belt, pull back the drilling equipment, and insert the drainage belt into the drilled hole.

4. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 1 is characterized in that: It also includes T4: a liquid return process, in which the second ditch is connected to the two first ditches through a water pump, and the water pump can extract repair liquid from the first ditch and transport it back to the first ditch.

5. A plug-and-press integrated repair method for groundwater pollution remediation at a site according to any one of claims 1 to 4, characterized in that: The middle part of the drainage belt is relatively horizontally arranged, and the two ends of the drainage belt are bent relative to the first ditch.

6. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 5, characterized in that: A plurality of the drainage belts are in contact with the second ditch to absorb the repairing fluid in the second ditch.

7. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 6, characterized in that: A plurality of the drainage belts are arranged in an array on the cross section of the farmland.

8. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 1 is characterized in that: The drainage belt is a water-permeable drainage belt, which is provided with a plurality of small holes and a water channel connected with the small holes. The drainage belt can absorb moisture in the soil layer through the small holes and transport the moisture using the water channel.

9. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 1, characterized in that: A first waterproof layer is provided in the first ditch, and the first waterproof layer can prevent the repair liquid from penetrating the side and bottom of the first ditch.

10. The plug-and-press integrated repair method for groundwater pollution remediation of a site according to claim 1, characterized in that: A second waterproof layer is provided in the second ditch, the bottom of the second waterproof layer is relatively open, and the second waterproof layer can prevent the repair fluid from penetrating the side of the second ditch.

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