A circulating remediation device and method for contaminated groundwater

Abstract

The invention discloses a circulating remediation device and method for contaminated groundwater, the device comprising a remediation well, an aeration component, a water circulation component and a gas purification component; the remediation well comprises a water collection well and a drainage well; the aeration component is used for aerating the contaminated groundwater entering the water collection well; the water circulation component is used for introducing the contaminated groundwater after purification inside the water collection well into the drainage well; the gas purification component is used for purifying the volatile pollutants in the contaminated groundwater; the device structure of the invention is reasonably designed, and by setting independent water collection wells and drainage wells, the stable and efficient circulation treatment of the contaminated groundwater is ensured, the operation difficulty of the device is reduced, and the reliability and stability of the device are improved; at the same time, the gas purification component is used to purify the volatile pollutants in the contaminated groundwater that have not been oxidized and decomposed, so as to effectively avoid the generation of secondary pollution, improve the safety of the equipment, and be suitable for popularization and use.

Description

Technical Field

[0001] The present invention relates to the technical field of contaminated groundwater treatment, and in particular to a circulating contaminated groundwater repair device and method. Background Art

[0002] Groundwater circulation remediation technology has attracted more and more attention because it can integrate related technologies such as aeration, gas extraction and stripping. This technology can also save a lot of auxiliary facilities and has little disturbance to the underground environment, which will further enhance the application space of this technology in the field of groundwater remediation in China.

[0003] However, during use, the existing groundwater circulation remediation equipment can only oxidize and decompose some volatile organic pollutants in the contaminated groundwater. The remediation of the contaminated groundwater is not thorough enough, and it is very easy for the pollutants in the contaminated groundwater to spread to the external environment and cause secondary pollution. At the same time, the existing groundwater circulation remediation equipment has high requirements for the start-up conditions of the groundwater circulation, and the groundwater circulation effect is not stable enough, which limits the development of contaminated groundwater remediation work. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides a circulating remediation device and method for contaminated groundwater.

[0005] The technical scheme of the present invention is: a contaminated groundwater circulation repair equipment, including a repair well, an aeration component, a water circulation component and a gas purification component; the repair well includes a water collection well and a plurality of drainage wells equidistantly distributed around the water collection well; the tops of the water collection well and the drainage well are both clamped with well covers; a plurality of water collection holes are circumferentially distributed at the lower position of the side wall of the water collection well, each of which is provided with a filter screen, and a dosing pipe is penetrated through the well cover on the water collection well; a water seepage screen is provided at the lower position of the side wall of each drainage well;

[0006] The aeration assembly includes an aerator arranged outside the water collection well and an aeration cylinder arranged inside the water collection well and connected to the output end of the aerator through an aeration pipeline; a plurality of aeration branches are evenly distributed on the outer wall of the aeration cylinder;

[0007] The water circulation assembly includes a circulation pump arranged on the ground and an annular pipe arranged on the ground and connected to each drainage well at the same time; the input end of the circulation pump is provided with an inlet pipe penetrating the well cover on the water collection well, and the output end of the circulation pump is provided with an outlet pipe connected to the annular pipe;

[0008] The gas purification component is arranged on the ground, and the gas purification component is communicated with the inside of the water collection well through an air inlet pipe.

[0009] Furthermore, the gas purification component includes a shell, an electric heating net and a net box arranged inside the shell from left to right, and an induced draft fan arranged on the outer wall of the shell; an air inlet end is arranged on the right side of the shell, and an air outlet end is arranged on the left side, and the air inlet end is connected to the air inlet pipe; two net boxes are arranged in parallel, the inside of the net box close to the electric heating net is filled with an activated carbon adsorbent, and the inside of the net box far from the electric heating net is filled with a photocatalyst; the induced draft fan is connected to the air outlet end;

[0010] Description: The volatile pollutant gas inside the water collection well enters the shell through the air inlet pipe under the action of the induced draft fan. The volatile pollutant gas is first catalytically decomposed by the photocatalyst, then adsorbed and purified by the activated carbon adsorbent, and finally dried by the electric heating network and discharged through the gas outlet. In the present invention, the photocatalyst can be a nano titanium dioxide photocatalyst with a particle size of 3~5nm and a particle size of the activated carbon adsorbent of 10~15nm.

[0011] Furthermore, a rotating shaft penetrating through the two net boxes is rotatably connected inside the shell, and stirring blades respectively located inside the two net boxes are sleeved at both ends of the rotating shaft, and a first gear sleeve is sleeved in the middle of the rotating shaft; a first rack meshingly connected with the first gear sleeve is penetrated through the shell, and a positioning rod movably plugged with the first rack is provided at the bottom of the shell, and a reset spring abutting against the bottom end of the first rack is sleeved on the positioning rod; a first motor is provided on the top surface of the shell, and a first incomplete gear meshingly connected with the first rack is connected to the output end of the first motor;

[0012] Description: The first motor is used to drive the first incomplete gear to rotate, so that the first rack moves up and down inside the shell under the action of the return spring. At this time, the rotating shaft drives the two stirring blades to reciprocate inside the corresponding mesh box under the meshing action of the first gear sleeve and the first rack, respectively stirring the photocatalyst and the activated carbon adsorbent, which is beneficial to improve the contact efficiency between the volatile pollutant gas and the photocatalyst and the activated carbon adsorbent, thereby helping to improve the purification efficiency of the volatile pollutant gas.

[0013] Furthermore, both ends of the mesh box are slidably connected with extrusion mesh plates through sliding rods; the two extrusion mesh plates are respectively slidably connected with the rotating shaft; and the ends of the two extrusion mesh plates away from each other are both provided with compression springs sleeved on the sliding rods;

[0014] Description: The two extrusion mesh plates inside the mesh box are moved closer to each other under the action of the compression spring, which compresses the photocatalyst and activated carbon adsorbent inside the mesh box to prevent volatile pollutant gases from escaping through the gaps between the photocatalyst and activated carbon adsorbent.

[0015] Furthermore, a debubble assembly is movably connected to the upper end of the water collection well; the debubble assembly includes a plurality of sleeves sleeved together and screen plates respectively arranged between two adjacent sleeves;

[0016] Description: The liquid level of contaminated groundwater inside the water collection well rises due to aeration, and bubbles are formed on the surface of the contaminated groundwater. By setting up a defoaming component composed of a casing and a sieve plate, it is possible to prevent the bubbles from carrying volatile pollutant gases out of the water collection well and causing secondary pollution to the atmospheric environment.

[0017] Furthermore, a hollow tube penetrating the manhole cover on the water collection well is provided at the top of the aeration cylinder; a rotating joint connected to the aeration pipeline is provided at the top of the hollow tube; a second gear sleeve is sleeved on the outer wall of the hollow tube; a second motor is provided on the manhole cover on the water collection well, and a second incomplete gear is connected to the output end of the second motor; a second rack slidably engaged with the manhole cover on the water collection well is provided between the second motor and the second gear sleeve; the second rack is meshed and connected with the second incomplete gear and the second gear sleeve respectively; a damping spring is provided inside the manhole cover on the water collection well and abuts against both ends of the second rack;

[0018] Description: The second motor is used to drive the second incomplete gear to rotate, and the second rack swings back and forth along the manhole cover on the water collection well under the action of the damping spring; at this time, the hollow tube drives the aeration cylinder to swing back and forth inside the water collection well under the meshing action of the second gear sleeve and the second rack, which is not only beneficial to improve the aeration effect, but also the aeration branch pipe can play a stirring role during the swinging process of the aeration cylinder, which is beneficial to improve the mixing effect of contaminated groundwater and remediation agent.

[0019] Furthermore, each filter screen is rotatably connected with a drive shaft, and each drive shaft is sleeved with a cleaning plate that abuts against the outer wall of the filter screen at the corresponding position; each drive shaft is provided with a bevel gear at one end close to each other; the aeration cylinder is sleeved with a bevel gear ring that is meshed with each bevel gear at the same time;

[0020] Note: The swing of the aeration cylinder drives the bevel gear ring to swing. At this time, each drive shaft drives the corresponding cleaning plate to swing under the meshing action of the bevel gear and the bevel gear ring. The cleaning plate is used to clean the pollutants on the filter screen to avoid clogging of the filter screen.

[0021] Furthermore, a rubber scraper is provided on one side of the cleaning plate close to the filter screen; a push spring is sleeved on the driving shaft and abuts against the outer side wall of the cleaning plate;

[0022] Note: By setting a rubber scraper, it is possible to avoid damage to the filter caused by friction between the cleaning plate and the filter; by setting a push spring, the rubber scraper is always in close contact with the filter, which is beneficial to improving the cleaning effect of the rubber scraper.

[0023] The present invention also provides a circulating remediation method for contaminated groundwater, based on the above-mentioned circulating remediation device for contaminated groundwater, comprising the following steps:

[0024] S1. Dig a water collection hole and several discharge holes respectively, then place the water collection well into the water collection hole, and place each drainage well into each discharge hole one by one; the polluted groundwater is filtered through the filter net on the water collection hole and then enters the water collection well;

[0025] S2. Use an aerator to inject external air into the aeration cylinder through the aeration pipeline, and then inject it into the contaminated groundwater through the aeration branch pipe to aerate the contaminated groundwater; the volatile pollutant gas in the contaminated groundwater enters the gas purification component through the air inlet pipe for purification and then is discharged;

[0026] S3. Inject the repair agent into the water collection well through the dosing pipe. After the repair agent reacts with the contaminated groundwater for 3 to 5 hours, use the circulation pump to inject the purified contaminated groundwater into each drainage well through the annular pipe. The purified contaminated groundwater re-enters the soil through the seepage screen pipes of each drainage well, thus realizing the circulation repair of the contaminated groundwater. Among them, the repair agent is a polylactic acid aqueous solution with a volume concentration of 12 to 18%.

[0027] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0028] First, the repair equipment of the present invention has a reasonable structural design. By setting up independent water collection wells and drainage wells, it ensures stable and efficient circulation treatment of contaminated groundwater, reduces the difficulty of equipment operation, and is conducive to improving the reliability and stability of the equipment.

[0029] Second, the present invention utilizes a gas purification component to purify volatile pollutants in contaminated groundwater that have not been oxidized and decomposed, thereby effectively avoiding the generation of secondary pollution and improving the safety of the equipment;

[0030] Third, the present invention provides a reciprocating aeration cylinder inside the water collection well, which is not only conducive to improving the aeration efficiency of the contaminated groundwater, but also can improve the mixing effect of the repair agent and the contaminated groundwater, making the repair of the contaminated groundwater more thorough. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a longitudinal section view of the repair device of the present invention;

[0032] Figure 2 is a top view of the repair device of the present invention;

[0033] Figure 3 is a schematic diagram of the connection between the second motor and the hollow tube of the present invention;

[0034] Figure 4 It is a schematic diagram of the connection between the aeration cylinder and the water collection well of the present invention;

[0035] Figure 5is a schematic structural diagram of a gas purification assembly of the present invention;

[0036] Figure 6 The present invention Figure 5 A local enlarged schematic diagram of the middle A;

[0037] Figure 7 It is a schematic diagram of the connection between the defoaming assembly and the water collection well of the present invention;

[0038] Figure 8 The present invention Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0039] Among them, 1-repair well, 10-water collection well, 100-water collection hole, 101-filter screen, 11-drainage well, 110-seepage screen, 12-well cover, 2-aeration component, 20-aerator, 21-aeration cylinder, 210-aeration pipeline, 211-aeration branch pipe, 22-hollow pipe, 220-rotating joint, 221-second gear sleeve, 23-second motor, 230-second incomplete gear, 231-second rack, 2310-damping spring, 3-water circulation component, 30-circulation pump, 300-water inlet pipe, 301-water outlet pipe, 31-ring pipe, 4-gas purification component, 40-air intake Tube, 41-shell, 410-inlet end, 411-outlet end, 42-electric heating net, 43-net box, 430-slide rod, 431-extrusion net plate, 432-compression spring, 44-induced draft fan, 45-rotating shaft, 450-stirring fan blade, 451-first gear sleeve, 452-first rack, 453-positioning rod, 4530-reset spring, 46-first motor, 460-first incomplete gear, 5-dosing tube, 6-defoaming assembly, 60-sleeve, 61-sieve plate, 7-drive shaft, 70-cleaning plate, 71-bevel gear, 72-bevel gear ring, 73-rubber scraper, 74-push spring. DETAILED DESCRIPTION

[0040] Example 1: Figure 1 , Figure 2 , Figure 4 , Figure 8 A contaminated groundwater circulation remediation device shown in the figure comprises a remediation well 1, an aeration component 2, a water circulation component 3 and a gas purification component 4; the remediation well 1 comprises a water collection well 10 and 6 drainage wells 11 equidistantly distributed around the water collection well 10; the tops of the water collection well 10 and the drainage wells 11 are both clamped with a well cover 12; four water collection holes 100 are circumferentially distributed at the lower position of the side wall of the water collection well 10, and a filter screen 101 is arranged inside each water collection hole 100, and a dosing pipe 5 is penetrated through the well cover 12 on the water collection well 10; a seepage screen pipe 110 is arranged at the lower position of the side wall of each drainage well 11;

[0041] like Figure 1 , Figure 4 As shown, the aeration assembly 2 includes an aerator 20 disposed outside the water collection well 10 and an aeration cylinder 21 disposed inside the water collection well 10 and connected to the output end of the aerator 20 through an aeration pipeline 210; a plurality of aeration branches 211 are evenly distributed on the outer wall of the aeration cylinder 21; wherein the aerator 20 is a commercially available product;

[0042] like Figure 1 , Figure 2 As shown, the water circulation assembly 3 includes a circulation pump 30 arranged on the ground and an annular pipe 31 arranged on the ground and connected to each drainage well 11 at the same time; the input end of the circulation pump 30 is provided with a water inlet pipe 300 penetrating the manhole cover 12 on the water collection well 10, and the output end of the circulation pump 30 is provided with a water outlet pipe 301 connected to the annular pipe 31; wherein the circulation pump 30 is a commercially available product;

[0043] like Figure 1 As shown, the gas purification component 4 is arranged on the ground, and the gas purification component 4 is connected to the inside of the water collection well 10 through the air intake pipe 40; the gas purification component 4 is a prior art, for example, an existing organic waste gas catalytic combustion furnace can be used.

[0044] Embodiment 2: This embodiment describes a contaminated groundwater circulation repair method, based on a contaminated groundwater circulation repair device of embodiment 1, comprising the following steps:

[0045] S1. Dig a water collection hole and six drainage holes respectively, then place the water collection well 10 into the water collection hole, and place each drainage well 11 into each drainage hole one by one; the polluted groundwater is filtered through the filter net 101 on the water collection hole 100 and then enters the water collection well 10;

[0046] S2, using the aerator 20 to inject external air into the aeration cylinder 21 through the aeration pipeline 210, and then inject it into the contaminated groundwater through the aeration branch pipe 211, so as to aerate the contaminated groundwater; the volatile pollutant gas in the contaminated groundwater enters the gas purification component 4 through the air inlet pipe 40, is purified and then discharged;

[0047] S3. Inject the repair agent into the water collection well 10 through the dosing pipe 5. After the repair agent reacts with the contaminated groundwater for 3 hours, use the circulation pump 30 to inject the purified contaminated groundwater into each drainage well 11 through the annular pipe 31. The purified contaminated groundwater re-enters the soil through the seepage screen pipe 110 of each drainage well 11, thereby realizing the circulation repair of the contaminated groundwater. The repair agent is a polylactic acid aqueous solution with a volume concentration of 12%. The dosage of the repair agent needs to be determined according to the content of pollutants in the contaminated groundwater. No special limitation is made here, and technicians in this field can handle it according to experience.

[0048] Embodiment 3: This embodiment is different from Embodiment 1 in that 12 drainage wells 11 are provided; and 8 water collection holes 100 are provided.

[0049] Embodiment 4: This embodiment differs from Embodiment 1 in that Figure 5 As shown, the gas purification component 4 includes a shell 41, an electric heating net 42 and a mesh box 43 which are arranged inside the shell 41 from left to right, and an induced draft fan 44 which is arranged on the outer wall of the shell 41; an air inlet end 410 is arranged on the right side of the shell 41, and an air outlet end 411 is arranged on the left side, and the air inlet end 410 is connected to the air inlet pipe 40; two mesh boxes 43 are arranged in parallel, the mesh box 43 close to the electric heating net 42 is filled with activated carbon adsorbent, and the mesh box 43 away from the electric heating net 42 is filled with photocatalyst; the induced draft fan 44 is connected to the air outlet end 411; wherein the photocatalyst is a commercially available nano titanium dioxide photocatalyst with a particle size of 3~5nm, and the activated carbon adsorbent is also a commercially available product with a particle size of 10~15nm.

[0050] Example 5: This example describes a contaminated groundwater circulation repair method, which is based on a contaminated groundwater circulation repair device of Example 4. The difference from Example 2 is that:

[0051] In step S2, the volatile pollutant gas inside the water collection well 10 enters the interior of the housing 41 through the air inlet pipe 40 under the action of the induced draft fan 44, and the volatile pollutant gas is first catalytically decomposed by the photocatalyst, then adsorbed and purified by the activated carbon adsorbent, and finally dried by the electric heating net 42 and discharged through the gas outlet 411;

[0052] In step S3, the remediation agent reacts with the contaminated groundwater for 5 hours, and the remediation agent is a polylactic acid aqueous solution with a volume concentration of 18%.

[0053] Embodiment 6: This embodiment differs from Embodiment 4 in that Figure 5 , Figure 6As shown, a rotating shaft 45 passing through two net boxes 43 is rotatably connected inside the shell 41, and stirring blades 450 respectively located inside the two net boxes 43 are sleeved at both ends of the rotating shaft 45, and a first gear sleeve 451 is sleeved in the middle of the rotating shaft 45; a first rack 452 meshingly connected with the first gear sleeve 451 is penetrated through the shell 41, and a positioning rod 453 movably plugged with the first rack 452 is provided at the bottom of the shell 41, and a return spring 4530 abutting against the bottom end of the first rack 452 is sleeved on the positioning rod 453; a first motor 46 is provided on the top surface of the shell 41, and a first incomplete gear 460 meshingly connected with the first rack 452 is connected to the output end of the first motor 46; extrusion mesh plates 431 are slidably connected at both ends of the net box 43 through the sliding rod 430; the two extrusion mesh plates 431 are respectively slidably connected with the rotating shaft 45; the ends of the two extrusion mesh plates 431 away from each other are both provided with compression springs 432 sleeved on the sliding rod 430.

[0054] Example 7: This example describes a contaminated groundwater circulation repair method, which is based on a contaminated groundwater circulation repair device of Example 6. The difference from Example 5 is that:

[0055] In step S2, the first motor 46 is used to drive the first incomplete gear 460 to rotate, so that the first rack 452 moves up and down inside the shell 41 under the action of the return spring 4530. At this time, the rotating shaft 45 drives the two stirring blades 450 to reciprocate inside the corresponding mesh box 43 under the meshing action of the first gear sleeve 451 and the first rack 452, respectively moving the photocatalyst and the activated carbon adsorbent; at the same time, the two extrusion mesh plates 431 inside the mesh box 43 approach each other under the action of the compression spring 432, and compress the photocatalyst and activated carbon adsorbent inside the mesh box 43.

[0056] Embodiment 8: This embodiment differs from Embodiment 6 in that Figure 1 , Figure 7 As shown, a debubble assembly 6 is movably connected to the upper end of the water collecting well 10 ; the debubble assembly 6 includes three sleeves 60 which are sleeved together and sieve plates 61 which are respectively arranged between two adjacent sleeves 60 .

[0057] Embodiment 9: This embodiment describes a contaminated groundwater circulation repair method, which is based on a contaminated groundwater circulation repair device of Embodiment 8, and differs from Embodiment 7 in that:

[0058] In step S2 , the liquid level of the polluted groundwater in the water collection well 10 rises due to aeration, and bubbles are formed on the surface of the polluted groundwater. The bubbles are broken when passing through the sieve plate 61 .

[0059] Embodiment 10: This embodiment is different from Embodiment 8 in that five sleeves 60 are provided.

[0060] Embodiment 11: This embodiment differs from Embodiment 8 in that Figure 1 , Figure 2 , Figure 3 As shown, a hollow tube 22 penetrating the manhole cover 12 on the water collection well 10 is provided at the top of the aeration cylinder 21; a rotary joint 220 connected to the aeration pipeline 210 is provided at the top of the hollow tube 22; a second gear sleeve 221 is sleeved on the outer wall of the hollow tube 22; a second motor 23 is provided on the manhole cover 12 on the water collection well 10, and a second incomplete gear 230 is connected to the output end of the second motor 23; a second rack 231 slidably engaged with the manhole cover 12 on the water collection well 10 is provided between the second motor 23 and the second gear sleeve 221; the second rack 231 is meshedly connected with the second incomplete gear 230 and the second gear sleeve 221 respectively; a damping spring 2310 respectively abutting against the two ends of the second rack 231 is provided inside the manhole cover 12 on the water collection well 10.

[0061] Example 12: This example describes a contaminated groundwater circulation repair method, which is based on a contaminated groundwater circulation repair device of Example 11, and differs from Example 9 in that:

[0062] In step S2, the second motor 23 is used to drive the second incomplete gear 230 to rotate, and the second rack 231 swings back and forth along the manhole cover 12 on the water collection well 10 under the action of the damping spring 2310; at this time, the hollow tube 22 drives the aeration cylinder 21 to swing back and forth inside the water collection well 10 under the meshing action of the second gear sleeve 221 and the second rack 231;

[0063] In step S3, during the swinging process of the aeration cylinder 21, the aeration branch pipe 211 is used to stir the repair agent and the contaminated groundwater.

[0064] Embodiment 13: This embodiment differs from Embodiment 11 in that Figure 4 , Figure 8 As shown, each filter screen 101 is rotatably clamped with a drive shaft 7, and each drive shaft 7 is sleeved with a cleaning plate 70 that abuts against the outer wall of the filter screen 101 at the corresponding position; each drive shaft 7 is provided with a bevel gear 71 at one end close to each other; the outside of the aeration cylinder 21 is sleeved with a bevel gear ring 72 that is meshed with each bevel gear 71; a rubber scraper 73 is provided on the side of the cleaning plate 70 close to the filter screen 101; and a push spring 74 is sleeved on the drive shaft 7 and abuts against the outer wall of the cleaning plate 70.

[0065] Example 14: This example describes a contaminated groundwater circulation repair method, which is based on a contaminated groundwater circulation repair device of Example 13, and differs from Example 12 in that:

[0066] In step S2, the aeration cylinder 21 drives the bevel gear ring 72 to swing during its swinging process. At this time, each driving shaft 7 drives the corresponding cleaning plate 70 to swing under the meshing action of the bevel gear 71 and the bevel gear ring 72. The cleaning plate 70 is used to clean the pollutants on the filter screen 101. Under the action of the push spring 74, the cleaning plate 70 pushes the rubber scraper 73 to always be close to the filter screen 101.

[0067] It should be noted that the aerator 20, the second motor 23, the circulation pump 30, the electric heating network 42, the induced draft fan 44 and the first motor 46 used in the present invention all adopt existing technologies, and are not specifically limited here. The corresponding products can be selected according to actual needs.

Claims

1. A circulating remediation device for contaminated groundwater, characterized in that: The invention comprises a repair well (1), an aeration component (2), a water circulation component (3) and a gas purification component (4); the repair well (1) comprises a water collection well (10) and a plurality of drainage wells (11) equidistantly distributed around the water collection well (10); the tops of the water collection well (10) and the drainage wells (11) are both connected with well covers (12); a plurality of water collection holes (100) are circumferentially distributed at the lower part of the side wall of the water collection well (10), a filter screen (101) is provided inside each of the water collection holes (100), and a dosing pipe (5) is provided through the well cover (12) on the water collection well (10); a water seepage screen pipe (110) is provided at the lower part of the side wall of each of the drainage wells (11); The aeration assembly (2) comprises an aerator (20) arranged outside the water collection well (10) and an aeration cylinder (21) arranged inside the water collection well (10) and connected to the output end of the aerator (20) via an aeration pipeline (210); a plurality of aeration branch pipes (211) are evenly distributed on the outer wall of the aeration cylinder (21); The water circulation assembly (3) comprises a circulation pump (30) arranged on the ground and an annular pipe (31) arranged on the ground and connected to each of the drainage wells (11); the input end of the circulation pump (30) is provided with a water inlet pipe (300) penetrating the well cover (12) on the water collection well (10), and the output end of the circulation pump (30) is provided with a water outlet pipe (301) connected to the annular pipe (31); The gas purification component (4) is arranged on the ground, and the gas purification component (4) is connected to the interior of the water collection well (10) through an air intake pipe (40); The gas purification component (4) comprises a shell (41), an electric heating net (42) and a net box (43) arranged in sequence from left to right inside the shell (41), and an induced draft fan (44) arranged on the outer wall of the shell (41); an air inlet end (410) is arranged on the right side of the shell (41), and an air outlet end (411) is arranged on the left side, and the air inlet end (410) is connected to an air inlet pipe (40); two net boxes (43) are arranged in parallel, the net box (43) close to the electric heating net (42) is filled with an activated carbon adsorbent, and the net box (43) far from the electric heating net (42) is filled with a photocatalyst; the induced draft fan (44) is connected to the air outlet end (411); A rotating shaft (45) penetrating the two net boxes (43) is rotatably engaged inside the housing (41); stirring blades (450) respectively located inside the two net boxes (43) are sleeved at both ends of the rotating shaft (45); a first gear sleeve (451) is sleeved at the middle of the rotating shaft (45); a first rack (452) meshingly connected to the first gear sleeve (451) is penetrated through the housing (41); a positioning rod (453) movably plugged with the first rack (452) is provided at the bottom of the housing (41); a return spring (4530) abutting against the bottom end of the first rack (452) is sleeved on the positioning rod (453); a first motor (46) is provided on the top surface of the housing (41); an output end of the first motor (46) is connected to a first incomplete gear (460) meshingly connected to the first rack (452); Both ends of the mesh box (43) are slidably engaged with extrusion mesh plates (431) via sliding rods (430); the two extrusion mesh plates (431) are slidably engaged with the rotating shaft (45) respectively; and the ends of the two extrusion mesh plates (431) that are away from each other are each provided with a compression spring (432) sleeved on the sliding rod (430); Each filter screen (101) is rotatably connected to a drive shaft (7), and each drive shaft (7) is sleeved with a cleaning plate (70) that abuts against the outer wall of the filter screen (101) at a corresponding position; a bevel gear (71) is disposed at one end of each drive shaft (7) that is close to each other; and a bevel gear ring (72) that is meshed with each bevel gear (71) is sleeved on the outside of the aeration cylinder (21); A rubber scraper (73) is provided on one side of the cleaning plate (70) close to the filter screen (101); and a push spring (74) is sleeved on the drive shaft (7) and abuts against the outer side wall of the cleaning plate (70).

2. The contaminated groundwater circulation repair equipment according to claim 1 is characterized in that: A debubble assembly (6) is movably clamped at the upper end of the water collecting well (10); the debubble assembly (6) comprises a plurality of sleeves (60) sleeved together and screen plates (61) respectively arranged between two adjacent sleeves (60).

3. The contaminated groundwater circulation repair equipment according to claim 1 is characterized in that: The top of the aeration cylinder (21) is provided with a hollow tube (22) penetrating the manhole cover (12) on the water collection well (10); the top of the hollow tube (22) is provided with a rotary joint (220) connected to the aeration pipeline (210); the outer wall of the hollow tube (22) is sleeved with a second gear sleeve (221); the manhole cover (12) on the water collection well (10) is provided with a second motor (23), and the output end of the second motor (23) is connected to a second incomplete gear (230); a second rack (231) slidably engaged with the manhole cover (12) on the water collection well (10) is provided between the second motor (23) and the second gear sleeve (221); the second rack (231) is meshedly connected with the second incomplete gear (230) and the second gear sleeve (221); and a damping spring (2310) is provided inside the manhole cover (12) on the water collection well (10) and is respectively abutted against two ends of the second rack (231).

4. A method for circulating contaminated groundwater remediation, based on a circulating contaminated groundwater remediation device according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, respectively excavating a water collection hole and a plurality of discharge holes, then placing the water collection well (10) into the water collection hole, and placing each drainage well (11) into each discharge hole in a one-to-one correspondence; the contaminated groundwater is filtered through the filter net (101) on the water collection hole (100) and then enters the water collection well (10); S2, using an aerator (20) to inject external air into the interior of the aeration cylinder (21) through an aeration pipeline (210), and then injecting the air into the contaminated groundwater through an aeration branch pipe (211), thereby aerating the contaminated groundwater; volatile pollutant gases in the contaminated groundwater enter the gas purification component (4) through an air inlet pipe (40), are purified, and are then discharged; S3. A repair agent is injected into the water collection well (10) through the dosing pipe (5). After the repair agent reacts with the contaminated groundwater for 3 to 5 hours, the purified contaminated groundwater is injected into each drainage well (11) through the annular pipe (31) using a circulation pump (30). The purified contaminated groundwater re-enters the soil through the seepage screen pipe (110) of each drainage well (11), thereby realizing the circulation repair of the contaminated groundwater. The repair agent is a polylactic acid aqueous solution with a volume concentration of 12 to 18%.

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