An in-situ layered remediation device and method for groundwater in a chlorinated hydrocarbon contaminated site

Abstract

The invention discloses an in-situ layered repair device and method for groundwater in a chlorinated hydrocarbon contaminated site. The device comprises a repair well, an injection assembly and an adjusting motor. A plurality of injection holes of different heights are arranged on the side wall of the repair well. The injection assembly is used to inject an external repair agent into the groundwater in the chlorinated hydrocarbon contaminated site at different depths through the injection holes of different heights. The adjusting motor is used to drive the injection assembly to move up and down inside the repair well. The repair device of the invention has a reasonable structural design. By arranging the injection assembly that can move up and down inside the repair well, it is convenient to inject the repair agent into the groundwater in the chlorinated hydrocarbon contaminated site in layers, which not only improves the diffusion efficiency of the repair agent in the groundwater in the contaminated site, but also can adjust the injection amount of the repair agent according to the contamination degree of the groundwater in the contaminated site, thereby improving the scientific nature of the repair of the groundwater in the chlorinated hydrocarbon contaminated site and being suitable for popularization and use.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an in-situ stratified remediation device and method for groundwater in a chlorinated hydrocarbon contaminated site. Background Art

[0002] Chlorinated hydrocarbons are volatile organic pollutants with strong mobility in aquifers and pose great harm to human health. Perchloroethylene, trichloroethylene, trichloroethane and carbon tetrachloride are the most common chlorinated hydrocarbon pollutants. Due to the poor bioavailability of chlorinated hydrocarbons, complex hydrogeological conditions and the presence of heavy non-aqueous phase liquids, the remediation of groundwater contaminated by chlorinated hydrocarbons is difficult, prone to rebound and costly.

[0003] At present, the main methods for remediation of chlorinated hydrocarbon groundwater pollution include extraction treatment technology, air injection remediation technology, permeable reaction wall technology, agent injection technology, in situ bioremediation technology, etc.; individual remediation technologies have many limitations. For example, in agent injection technology, after the agent is injected, the agent often migrates and diffuses slowly and has a small radius of action; moreover, the existing agent injection technology can only inject the remediation agent into the contaminated groundwater at a fixed depth, and cannot adjust the injection depth and injection volume of the remediation agent according to the pollution status of the contaminated groundwater, which easily leads to waste of the remediation agent. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides an in-situ stratified remediation device and method for groundwater in a chlorinated hydrocarbon contaminated site.

[0005] The technical scheme of the present invention is: an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site, comprising a remediation well, an injection assembly arranged inside the remediation well, and an adjusting motor arranged at the top of the remediation well and providing lifting power for the injection assembly; the bottom end of the remediation well is closed, and a sealing cover is movably connected to the top; a guide pipe is vertically arranged inside the remediation well, and a plurality of injection hole assemblies are evenly distributed from top to bottom on the side wall of the remediation well; the injection hole assembly is composed of a plurality of injection holes distributed circumferentially;

[0006] The injection assembly includes a mounting plate that is slidably engaged on the guide tube, a plurality of injection tubes that are equidistantly distributed on the mounting plate, a push plate that is slidably engaged inside the mounting plate and abuts against each injection tube, and an electric push rod that is arranged on the upper end surface of the mounting plate and connected to the push plate; the mounting plate is hollow inside; each injection tube is slidably engaged on the outer wall of the mounting plate, and each injection tube is sleeved with a return spring that abuts against the inner wall of the mounting plate, and each injection tube is provided with a wedge seat at one end that is close to each other; the push plate is sleeved with a wedge ring that abuts against each wedge seat at the same time; and a delivery pump that is connected to each injection tube through a conduit is arranged on the upper end surface of the sealing cover.

[0007] Furthermore, the regulating motor is arranged on the upper end surface of the sealing cover, and the output end of the regulating motor is connected with a lifting screw penetrating the sealing cover and sleeved inside the guide tube; the lifting screw is threadedly connected with a threaded seat which is slidably engaged with the guide tube and fixedly connected with the mounting plate;

[0008] Description: The adjusting motor is used to drive the lifting screw to rotate. At this time, the threaded seat drives the mounting plate to move along the guide tube. The mounting plate is used to drive the injection tube to move, so that the repair agent can be injected into the contaminated groundwater in layers, realizing the in-situ layered repair of groundwater in chlorinated hydrocarbon contaminated sites.

[0009] Furthermore, an aeration tube is slidably connected inside the mounting plate and between two adjacent injection tubes; an aerator connected to each aeration tube through a conduit is arranged on the upper end surface of the sealing cover; each aeration tube is also provided with a wedge-shaped seat abutting against the wedge-shaped ring, and each aeration tube is also sleeved with a return spring abutting against the inner wall of the mounting plate;

[0010] Description: Use an aerator to inject outside air into the contaminated groundwater through the aeration pipe to increase the diffusion rate of the remediation agent in the contaminated groundwater. At the same time, it can increase the oxygen concentration in the groundwater, promote the degradation of aerobic microorganisms, and improve the remediation efficiency of groundwater in chlorinated hydrocarbon contaminated sites.

[0011] Furthermore, each wedge-shaped seat is provided with a limit rod that is slidably engaged with the inner wall of the mounting plate; each wedge-shaped seat is rotatably engaged with a guide roller that abuts against the wedge-shaped ring;

[0012] Note: By setting the limit rod, it is helpful to improve the stability of the injection tube and the aeration tube when they move on the mounting plate; by setting the guide roller, it is helpful to reduce the friction between the wedge seat and the wedge ring, thereby improving the response speed of the wedge seat.

[0013] Furthermore, a plurality of movable sleeves are evenly distributed from top to bottom on the inner wall of the repair well; barrier nets are arranged on the outer wall of the repair well and at positions corresponding to the positions of the movable sleeves; connecting rods movably connected to the repair well are arranged at the upper and lower ends of the movable sleeves, and a first damping spring is sleeved on each connecting rod; and each injection hole assembly is arranged on each movable sleeve in a one-to-one correspondence;

[0014] Description: When the injection pipe and the aeration pipe extend out of the corresponding injection holes, the adjusting motor is used to drive the mounting plate to move inside the repair well. At this time, the movable sleeve moves synchronously with the mounting plate, further expanding the injection range of the repair agent.

[0015] Furthermore, a swing plate fixedly connected to the threaded seat is rotatably clamped on the mounting plate; a plurality of arc-shaped slide grooves are evenly distributed on the inner wall of the swing plate; an arc-shaped seat corresponding to each arc-shaped slide groove and slidingly clamped is arranged on the inner side wall of the mounting plate; a second damping spring abutting against the arc-shaped slide groove at the corresponding position is arranged on both sides of each arc-shaped seat; an inner gear ring is arranged on the inner wall of each movable sleeve; a micro motor is arranged on the upper end surface of the mounting plate, and an incomplete gear meshing with the inner gear ring is connected to the output end of the micro motor;

[0016] Description: A micro motor is used to drive the incomplete gear to rotate. At this time, the mounting plate is installed to swing back and forth on the swing plate, so that the injection tube swings back and forth inside the corresponding injection hole, which is beneficial to expand the diffusion range of the repair agent in the groundwater at the same depth.

[0017] Furthermore, the sealing cover is provided with a plurality of anode electrodes and cathode electrodes located in the circumference of the repair well; the anode electrodes and cathode electrodes are arranged at intervals, and casings are provided outside the anode electrodes and cathode electrodes;

[0018] Description: When in use, connect the external power supply to the anode electrode and the cathode electrode respectively. At this time, an oxidation reaction occurs at the anode electrode and oxygen is produced, providing an oxidizing environment for the biological aerobic degradation of low-chlorinated hydrocarbons such as vinyl chloride, benzene series and alkanes; while a reduction reaction occurs at the cathode electrode and hydrogen is produced, providing a reducing environment for the biological anaerobic dechlorination of chlorinated hydrocarbon pollutants, promoting the effective degradation of chlorinated hydrocarbons by microorganisms, improving the biodegradation efficiency of chlorinated hydrocarbon pollutants, and improving the remediation efficiency of groundwater in chlorinated hydrocarbon contaminated sites.

[0019] Furthermore, a gear box is arranged on the upper end surface of the sealing cover, and the regulating motor, the delivery pump and the aerator are all arranged on the upper end surface of the gear box; the upper end surface of the sealing cover is rotatably clamped with a threaded driving sleeve respectively sleeved on the outside of each sleeve, and the outer wall of each sleeve is provided with an external thread threadedly connected with the threaded driving sleeve at the corresponding position; each threaded driving sleeve is sleeved with a connecting gear; the lifting screw is sleeved with a driving toothed disc that is meshed and connected with each connecting gear at the same time; an integrated ring plate that is fixedly connected with each anode electrode and cathode electrode at the same time is arranged above the gear box;

[0020] Description: The lifting screw rotates and drives the drive gear disc to rotate. At this time, each threaded drive sleeve rotates under the meshing action of the connecting gear and the drive gear disc. At this time, each sleeve drives the corresponding anode electrode and cathode electrode to move up and down along the sealing cover, so that the anode electrode and cathode electrode can move synchronously with the installation carrier, thereby improving the accuracy of groundwater remediation in chlorinated hydrocarbon contaminated sites.

[0021] Furthermore, an ultrasonic sensor is arranged on the mounting plate, and a PLC controller electrically connected to the ultrasonic sensor and the regulating motor is arranged on the upper end surface of the gear box;

[0022] Note: By setting up an ultrasonic sensor, it is helpful to improve the positioning accuracy of the injection tube and the injection hole and improve the reliability of the equipment.

[0023] The present invention also discloses an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site. Based on the above-mentioned in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site, the method comprises the following steps:

[0024] S1. Dig a groundwater repair pit, then place a repair well inside the repair pit, and snap a sealing cover onto the top of the repair well;

[0025] S2, using the regulating motor to drive the installation plate to move downward along the guide tube to the injection hole position at the uppermost end of the repair well; using the electric push rod to pull the push plate to move upward along the inner wall of the installation plate, at this time, the injection tube extends out of the corresponding injection hole under the abutment of the wedge seat and the wedge ring;

[0026] S3, connecting the delivery pump to the external remediation agent storage device, and using the delivery pump to inject the external remediation agent into the groundwater of the contaminated site through the injection tube; and adjusting the injection amount of the external remediation agent according to the degree of contamination of the groundwater of the contaminated site; wherein the external remediation agent is a ferrate solution with a volume concentration of 15-25%;

[0027] S4. Use the electric push rod to push the push plate to move downward along the inner wall of the installation carrier. At this time, each injection tube enters the interior of the installation carrier under the action of the return spring; then use the adjustment motor to drive the installation carrier to continue to move downward along the guide tube, so that the injection tube reaches the next injection hole position, and the external remediation agent is injected into the groundwater of the contaminated site through the injection tube;

[0028] S5. Repeat step S4 until the external remediation agent is injected into the groundwater of the contaminated site at various depths.

[0029] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0030] First, the repair equipment of the present invention has a reasonable structural design. By providing an injection assembly that can move up and down inside the repair well, the repair agent can be injected into the groundwater of the chlorinated hydrocarbon contaminated site in layers, which not only improves the diffusion efficiency of the repair agent in the groundwater of the contaminated site, but also can adjust the injection amount of the repair agent according to the degree of contamination of the groundwater in the contaminated site, thereby improving the scientific nature of the repair of groundwater in the chlorinated hydrocarbon contaminated site.

[0031] Second, the present invention arranges an aeration tube on the mounting tray and uses an aerator to inject outside air into the contaminated groundwater through the aeration tube, thereby increasing the diffusion rate of the repair agent in the contaminated groundwater and increasing the oxygen concentration in the groundwater, promoting the degradation of aerobic microorganisms, and improving the repair efficiency of groundwater in chlorinated hydrocarbon contaminated sites;

[0032] Third, the present invention arranges an anode electrode and a cathode electrode on the sealing cover. When the anode electrode and the cathode electrode are energized, an oxidation reaction occurs on the anode electrode and oxygen is generated, providing an oxidizing environment for the biological aerobic degradation of low-chlorinated hydrocarbons such as vinyl chloride, benzene series and alkanes. A reduction reaction occurs on the cathode electrode and hydrogen is generated, providing a reducing environment for the biological anaerobic dechlorination of chlorinated hydrocarbon pollutants, promoting the effective degradation of chlorinated hydrocarbons by microorganisms, and improving the biodegradation efficiency of chlorinated hydrocarbon pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a longitudinal sectional view of the apparatus of the present invention;

[0034] Figure 2 is a front view of the device of the present invention;

[0035] Figure 3 It is a distribution diagram of the injection pipe and the aeration pipe of the present invention on the mounting plate;

[0036] Figure 4 It is a schematic diagram of the connection between the mounting plate and the guide tube of the present invention;

[0037] Figure 5 is a positional relationship diagram of the injection tube and the injection hole of the present invention;

[0038] Figure 6 The present invention Figure 4 A local enlarged schematic diagram of the middle A;

[0039] Figure 7 It is a schematic diagram of the connection between the swing plate and the mounting plate of the present invention;

[0040] Figure 8 It is a schematic diagram of the connection between the driving toothed disc and the connecting gear of the present invention;

[0041] Among them, 1-repair well, 10-sealing cover, 11-guide tube, 12-injection hole assembly, 120-injection hole, 13-barrier net, 14-gear box, 2-injection assembly, 20-mounting carrier, 200-arc seat, 201-second damping spring, 21-injection tube, 210-reset spring, 211-wedge seat, 212-guide roller, 22-push plate, 220-wedge ring, 23-electric push rod, 24-delivery pump, 25-limit rod, 26-swing plate, 260-arc slide, 3-adjusting motor, 30-lifting screw, 31-threaded seat, 4-aerator, 40-aeration pipe, 5-movable sleeve, 50-connecting rod, 500-first damping spring, 51-inner gear ring, 52-micro motor, 520-incomplete gear, 6-sleeve, 60-anode electrode, 61-cathode electrode, 62-integrated ring plate, 7-threaded drive sleeve, 70-connecting gear, 71-driving gear disc, 8-ultrasonic sensor, 80-PLC controller. DETAILED DESCRIPTION

[0042] Example 1: Figure 1 , Figure 5 The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site shown in the figure comprises a remediation well 1, an injection assembly 2 arranged inside the remediation well 1, and an adjusting motor 3 arranged at the top of the remediation well 1 and providing lifting power for the injection assembly 2; the bottom end of the remediation well 1 is closed, and a sealing cover 10 is movably connected to the top; a guide pipe 11 is vertically arranged inside the remediation well 1, and three injection hole assemblies 12 are evenly distributed from top to bottom on the side wall of the remediation well 1; the injection hole assembly 12 consists of 8 injection holes 120 distributed circumferentially;

[0043] like Figure 1 , Figure 3 , Figure 4 As shown, the injection assembly 2 includes a mounting plate 20 slidably clamped on the guide tube 11, 4 injection tubes 21 equidistantly distributed on the mounting plate 20, a push plate 22 slidably clamped inside the mounting plate 20 and abutting against each injection tube 21, and an electric push rod 23 arranged on the upper end surface of the mounting plate 20 and connected to the push plate 22; the mounting plate 20 is hollow inside; each injection tube 21 is slidably clamped on the outer wall of the mounting plate 20, and each injection tube 21 is sleeved with a return spring 210 abutting against the inner wall of the mounting plate 20, and each injection tube 21 is provided with a wedge seat 211 at one end close to each other; the push plate 22 is sleeved with a wedge ring 220 abutting against each wedge seat 211; the upper end surface of the sealing cover 10 is provided with a delivery pump 24 connected to each injection tube 21 through a guide tube (not shown in the figure);

[0044] like Figure 1 , Figure 3As shown, the adjusting motor 3 is arranged on the upper end surface of the sealing cover 10, and the output end of the adjusting motor 3 is connected to a lifting screw 30 that penetrates the sealing cover 10 and is sleeved inside the guide tube 11; the lifting screw 30 is threadedly connected to a threaded seat 31 that is slidably engaged with the guide tube 11 and fixedly connected to the mounting plate 20.

[0045] Example 2: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site in Example 1, comprising the following steps:

[0046] S1, excavating a groundwater repair pit (not shown in the figure), then placing a repair well 1 inside the repair pit, and clamping a sealing cover 10 on the top of the repair well 1;

[0047] S2, using the adjusting motor 3 to drive the lifting screw 30 to rotate, at this time the threaded seat 31 drives the installation carrier 20 to move downward along the guide tube 11 to the injection hole 120 at the uppermost end of the repair well 1; using the electric push rod 23 to pull the push plate 22 to move upward along the inner wall of the installation carrier 20, at this time the injection tube 21 extends out of the corresponding injection hole 120 under the abutment of the wedge seat 211 and the wedge ring 220;

[0048] S3, connecting the delivery pump 24 to the external repair agent storage device (not shown in the figure), and injecting the external repair agent into the groundwater of the contaminated site through the injection tube 21 by using the delivery pump 24; and adjusting the injection amount of the external repair agent according to the contamination degree of the groundwater of the contaminated site; wherein the external repair agent is a ferrate solution with a volume concentration of 15%;

[0049] S4, using the electric push rod 23 to push the push plate 22 to move downward along the inner wall of the installation carrier 20, at this time, each injection tube 21 enters the interior of the installation carrier 20 under the action of the return spring 210; then using the adjustment motor 3 to drive the installation carrier 20 to continue to move downward along the guide tube 11, so that the injection tube 21 reaches the position of the next injection hole 120, and the external repair agent is injected into the groundwater of the contaminated site through the injection tube 21;

[0050] S5. Repeat step S4 until the external remediation agent is injected into the groundwater of the contaminated site at various depths.

[0051] Embodiment 3: This embodiment is different from Embodiment 1 in that five injection hole assemblies 12 are provided, and the injection hole assemblies 12 are composed of 12 circumferentially distributed injection holes 120; and six injection tubes 21 are provided.

[0052] Example 4: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site in Example 1, which differs from Example 2 in that:

[0053] In step S3, the external repair agent is a ferrate solution with a volume concentration of 25%.

[0054] Embodiment 5: This embodiment differs from Embodiment 1 in that Figure 1 , Figure 3 , Figure 5 As shown, an aeration tube 40 is slidably connected inside the mounting plate 20 and between two adjacent injection tubes 21; an aerator 4 connected to each aeration tube 40 through a guide tube (not shown) is provided on the upper end surface of the sealing cover 10; each aeration tube 40 is also provided with a wedge-shaped seat 211 abutting against the wedge ring 220, and each aeration tube 40 is also sleeved with a return spring 210 abutting against the inner wall of the mounting plate 20; the aerator 4 is used to inject external air into the contaminated groundwater through the aeration tube 40, thereby increasing the diffusion rate of the repair agent in the contaminated groundwater, and at the same time being able to increase the oxygen concentration in the groundwater, promote the degradation of aerobic microorganisms, and improve the repair efficiency of groundwater in chlorinated hydrocarbon contaminated sites.

[0055] Example 6: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site in Example 5, which differs from Example 2 in that:

[0056] In step S2, the aeration pipe 40 and the injection pipe 21 extend out of the corresponding injection holes 120 simultaneously;

[0057] In step S3 , the aerator 4 is used to inject outside air into the contaminated groundwater through the aeration pipe 40 .

[0058] Embodiment 7: This embodiment differs from Embodiment 5 in that Figure 6 As shown, each wedge-shaped seat 211 is provided with a limit rod 25 that is slidably engaged with the inner wall of the mounting plate 20 ; each wedge-shaped seat 211 is rotatably engaged with a guide roller 212 that abuts against the wedge ring 220 .

[0059] Embodiment 8: This embodiment differs from Embodiment 7 in that Figure 1 , Figure 2 , Figure 4As shown, three movable sleeves 5 are evenly distributed from top to bottom on the inner wall of the repair well 1; barrier nets 13 are arranged on the outer wall of the repair well 1 and at positions corresponding to the positions of each movable sleeve 5; connecting rods 50 movably plugged into the repair well 1 are arranged at the upper and lower ends of the movable sleeve 5, and each connecting rod 50 is sleeved with a first damping spring 500; and each injection hole assembly 12 is arranged on each movable sleeve 5 in a one-to-one correspondence.

[0060] Example 9: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site in Example 8, which differs from Example 6 in that:

[0061] In step S3 , when the injection pipe 21 and the aeration pipe 40 extend out of the corresponding injection holes 120 , the adjusting motor 3 is used to drive the mounting plate 20 to move inside the repair well 1 , and the moving sleeve 5 moves synchronously with the mounting plate 20 .

[0062] Embodiment 10: This embodiment is different from Embodiment 8 in that four movable sleeves 5 are provided.

[0063] Embodiment 11: This embodiment differs from Embodiment 8 in that Figure 4 , Figure 7 As shown, a swing plate 26 fixedly connected to a threaded seat 31 is rotatably clamped on the mounting plate 20; four arc-shaped grooves 260 are evenly distributed on the inner wall of the swing plate 26; an arc-shaped seat 200 slidably clamped in correspondence with each arc-shaped groove 260 is provided on the inner side wall of the mounting plate 20; both sides of each arc-shaped seat 200 are provided with a second damping spring 201 abutting against the arc-shaped groove 260 at the corresponding position; an inner gear ring 51 is provided on the inner wall of each movable sleeve 5; a micro motor 52 is provided on the upper end surface of the mounting plate 20, and an incomplete gear 520 meshing with the inner gear ring 51 is connected to the output end of the micro motor 52.

[0064] Example 12: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site in Example 11, which differs from Example 9 in that:

[0065] In step S3 , the micro motor 52 is used to drive the incomplete gear 520 to rotate. At this time, the mounting plate 20 swings back and forth on the swing plate 26 , so that the injection pipe 21 and the aeration pipe 40 swing back and forth inside the corresponding injection hole 120 .

[0066] Embodiment 13: This embodiment differs from Embodiment 11 in that Figure 1 , Figure 2 , Figure 8As shown, the sealing cover 10 is provided with four anode electrodes 60 and four cathode electrodes 61 located in the circumference of the repair well 1; the anode electrodes 60 and the cathode electrodes 61 are arranged at intervals, and the anode electrodes 60 and the cathode electrodes 61 are sleeved with sleeves 6 on the outside; the upper end surface of the sealing cover 10 is provided with a gear box 14, and the regulating motor 3, the delivery pump 24 and the aerator 4 are all arranged on the upper end surface of the gear box 14; the upper end surface of the sealing cover 10 is rotatably clamped with threaded drive sleeves 7 respectively sleeved on the outside of each sleeve 6, and the outer wall of each sleeve 6 is provided with external threads threadedly connected to the threaded drive sleeve 7 at the corresponding position (not shown in the figure); each threaded drive sleeve 7 is sleeved with a connecting gear 70; the lifting screw 30 is sleeved with a driving toothed disc 71 that is meshed with each connecting gear 70 at the same time; and an integrated ring plate 62 that is fixedly connected to each anode electrode 60 and cathode electrode 61 at the same time is provided above the gear box 14.

[0067] Example 14: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site in Example 13, which differs from Example 12 in that:

[0068] After step S3 is completed, the external power supply is connected to the anode electrode 60 and the cathode electrode 61 respectively. At this time, an oxidation reaction occurs on the anode electrode 60 and oxygen is generated, providing an oxidizing environment for the biological aerobic degradation of low-chlorinated hydrocarbons such as vinyl chloride, benzene series and alkanes. A reduction reaction occurs on the cathode electrode and hydrogen is generated, providing a reducing environment for the biological anaerobic dechlorination of chlorinated hydrocarbon pollutants. Among them, the anode electrode 60 is a graphite electrode, the cathode electrode 61 is a magnesium alloy electrode, and the external power supply voltage is 10V; the lifting screw 30 drives the driving toothed disc 71 to rotate during the rotation. At this time, each threaded drive sleeve 7 rotates under the meshing action of the connecting gear 70 and the driving toothed disc 71. At this time, each sleeve 6 drives the corresponding anode electrode 60 and cathode electrode 61 to move up and down along the sealing cover 10, so that the anode electrode 60 and the cathode electrode 61 can move synchronously with the mounting plate 20.

[0069] Embodiment 15: This embodiment differs from Embodiment 13 in that Figure 2 , Figure 4 As shown, an ultrasonic sensor 8 is disposed on the mounting plate 20 , and a PLC controller 80 electrically connected to the ultrasonic sensor 8 and the regulating motor 3 is disposed on the upper end surface of the gear box 14 .

[0070] Example 16: This example describes an in-situ stratified remediation method for groundwater in a chlorinated hydrocarbon contaminated site, and an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site based on Example 15. The difference from Example 14 is that:

[0071] In step S2, the adjusting motor 3 is used to drive the mounting plate 20 to move downward along the guide tube 11. When the ultrasonic sensor 8 senses the injection hole 120, the PLC controller 80 is used to control the adjusting motor 3 to stop running.

[0072] It should be noted that the injection tube 21, electric push rod 23, delivery pump 24, adjustment motor 3, aerator 4, aeration tube 40, micro motor 52, anode electrode 60, cathode electrode 61, ultrasonic sensor 8 and PLC controller 80 used in the present invention all adopt existing technologies, and no special limitations are made here. The corresponding products can be selected according to actual needs.

Claims

1. An in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site, characterized in that: The invention comprises a repair well (1), an injection assembly (2) arranged inside the repair well (1), and an adjusting motor (3) arranged at the top of the repair well (1) and providing lifting power for the injection assembly (2); the bottom end of the repair well (1) is closed, and a sealing cover (10) is movably connected to the top end; a guide tube (11) is vertically arranged inside the repair well (1); and a plurality of injection hole assemblies (12) are evenly distributed from top to bottom on the side wall of the repair well (1); the injection hole assembly (12) is composed of a plurality of injection holes (120) distributed in an annular direction; The injection assembly (2) comprises a mounting plate (20) slidably engaged with the guide tube (11), a plurality of injection tubes (21) equidistantly distributed on the mounting plate (20), a push plate (22) slidably engaged with the inside of the mounting plate (20) and abutting against each of the injection tubes (21), and an electric push rod (23) disposed on the upper end surface of the mounting plate (20) and connected to the push plate (22); the mounting plate (20) is hollow inside; each of the injection tubes (21) is slidably engaged with the inside of the mounting plate (20) and abuts against each of the injection tubes (21); The movable clamp is connected to the outer wall of the mounting plate (20), and each injection tube (21) is sleeved with a return spring (210) that abuts against the inner wall of the mounting plate (20), and each injection tube (21) is provided with a wedge seat (211) at one end close to each other; the outer side of the push plate (22) is sleeved with a wedge ring (220) that abuts against each of the wedge seats (211); and the upper end surface of the sealing cover (10) is provided with a delivery pump (24) that is connected to each of the injection tubes (21) through a conduit.

2. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 1, characterized in that: The regulating motor (3) is arranged on the upper end surface of the sealing cover (10), and the output end of the regulating motor (3) is connected to a lifting screw (30) that penetrates the sealing cover (10) and is sleeved inside the guide tube (11); a threaded seat (31) is threadedly connected on the lifting screw (30) and is slidably engaged with the guide tube (11) and fixedly connected to the mounting plate (20).

3. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 1, characterized in that: An aeration tube (40) is slidably connected inside the mounting plate (20) and between two adjacent injection tubes (21); an aerator (4) is provided on the upper end surface of the sealing cover (10) and is connected to each of the aeration tubes (40) through a conduit; each of the aeration tubes (40) is also provided with a wedge-shaped seat (211) abutting against the wedge-shaped ring (220); and each of the aeration tubes (40) is also sleeved with a return spring (210) abutting against the inner wall of the mounting plate (20).

4. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 1, characterized in that: Each wedge-shaped seat (211) is provided with a limit rod (25) that is slidably engaged with the inner wall of the mounting plate (20); each wedge-shaped seat (211) is rotatably engaged with a guide roller (212) that abuts against the wedge-shaped ring (220).

5. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 1, characterized in that: A plurality of movable sleeves (5) are evenly spaced from top to bottom on the inner wall of the repair well (1); barrier nets (13) are arranged on the outer wall of the repair well (1) at positions corresponding to the positions of the movable sleeves (5); connecting rods (50) movably plugged into the repair well (1) are arranged at the upper and lower ends of the movable sleeves (5), and a first damping spring (500) is sleeved on each of the connecting rods (50); and each injection hole assembly (12) is arranged on each movable sleeve (5) in a one-to-one correspondence.

6. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 5, characterized in that: A swing plate (26) fixedly connected to the threaded seat (31) is rotatably engaged on the mounting plate (20); a plurality of arc-shaped slide grooves (260) are equidistantly distributed on the inner wall of the swing plate (26); an arc-shaped seat (200) is provided on the inner side wall of the mounting plate (20) and is slidably engaged with each of the arc-shaped slide grooves (260) in a one-to-one correspondence; a second damping spring (201) is provided on both sides of each of the arc-shaped seats (200) and is in contact with the arc-shaped slide grooves (260) at a corresponding position; an inner gear ring (51) is provided on the inner wall of each of the movable sleeves (5); a micro motor (52) is provided on the upper end surface of the mounting plate (20), and an output end of the micro motor (52) is connected to an incomplete gear (520) meshingly connected to the inner gear ring (51).

7. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 2, characterized in that: The sealing cover (10) is provided with a plurality of anode electrodes (60) and cathode electrodes (61) located in the circumferential direction of the repair well (1); the anode electrodes (60) and cathode electrodes (61) are arranged at intervals, and the anode electrodes (60) and cathode electrodes (61) are both provided with sleeves (6) outside.

8. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 7, characterized in that: The upper end surface of the sealing cover (10) is provided with a gear box (14), and the regulating motor (3), the delivery pump (24) and the aerator (4) are all provided on the upper end surface of the gear box (14); the upper end surface of the sealing cover (10) is rotatably engaged with a threaded drive sleeve (7) respectively sleeved on the outside of each sleeve (6), and the outer wall of each sleeve (6) is provided with an external thread threadedly connected to the threaded drive sleeve (7) at a corresponding position; each threaded drive sleeve (7) is sleeved with a connecting gear (70); the lifting screw (30) is sleeved with a driving toothed disc (71) meshingly connected to each connecting gear (70); and an integrated ring plate (62) is provided above the gear box (14) and is fixedly connected to each anode electrode (60) and cathode electrode (61).

9. The in-situ stratified remediation equipment for groundwater in a chlorinated hydrocarbon contaminated site according to claim 8, characterized in that: An ultrasonic sensor (8) is disposed on the mounting plate (20), and a PLC controller (80) electrically connected to the ultrasonic sensor (8) and the regulating motor (3) is disposed on the upper end surface of the gear box (14).

10. A method for in-situ stratified remediation of groundwater in a chlorinated hydrocarbon contaminated site, based on an in-situ stratified remediation device for groundwater in a chlorinated hydrocarbon contaminated site according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, excavating a groundwater repair pit, then placing a repair well (1) inside the repair pit, and snapping a sealing cover (10) onto the top of the repair well (1); S2, using the regulating motor (3) to drive the mounting plate (20) to move downward along the guide tube (11) to the position of the injection hole (120) at the uppermost end of the repair well (1); using the electric push rod (23) to pull the push plate (22) to move upward along the inner wall of the mounting plate (20), at which time the injection tube (21) extends out of the corresponding injection hole (120) under the abutment action of the wedge seat (211) and the wedge ring (220); S3, connecting the delivery pump (24) to the external remediation agent storage device, and using the delivery pump (24) to inject the external remediation agent into the groundwater of the contaminated site through the injection tube (21); The injection amount of the external remediation agent is adjusted according to the degree of contamination of groundwater in the contaminated site; wherein the external remediation agent is a ferrate solution with a volume concentration of 15-25%; S4, using the electric push rod (23) to push the push plate (22) to move downward along the inner wall of the mounting plate (20), at which time each injection tube (21) enters the interior of the mounting plate (20) under the action of the return spring (210); then using the adjustment motor (3) to drive the mounting plate (20) to continue to move downward along the guide tube (11), so that the injection tube (21) reaches the position of the next injection hole (120), and the external repair agent is injected into the groundwater of the contaminated site through the injection tube (21); S5. Repeat step S4 until the external remediation agent is injected into the groundwater of the contaminated site at various depths.

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