Adjustable circulation well and method for LNAPL contaminated groundwater treatment

Abstract

The invention discloses an adjustable circulation well and method for treating LNAPL contaminated groundwater. The circulation well comprises a well body, a purification component, an adjustable isolation component, a circulation pump and an aerator; the purification component comprises a purification box, an aeration plate, a floating plate, an oil removal drum and a driving motor; the adjustable isolation component comprises an isolation plate and a first electric rod; the circulation pump is used to pump contaminated groundwater at the bottom of the well body to the upper part of the well body; the aerator is connected to the aeration plate; the circulation well structure of the invention is reasonably designed, the circulation pump is used to pump contaminated groundwater from the bottom of the well body to the inside of the purification box, during the aeration process of the contaminated groundwater, the volatile pollutants in the contaminated groundwater are oxidized and decomposed, and then pumped out of the well body; at the same time, the oil absorption felt sleeve is used to adsorb and purify the LNAPL in the contaminated groundwater, and the purified contaminated groundwater is injected into the soil through the upper part of the well body side wall, thereby realizing the circulation purification of the contaminated groundwater.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an adjustable circulation well and a method for treating LNAPL-contaminated groundwater. Background Art

[0002] The groundwater circulation well is an in-situ remediation technology that can remove pollutants from groundwater and saturated soil. The technology is a well-in-well model formed by a double-layer casing and an upper and lower screen pipe combination. It combines extraction and treatment technology with in-situ treatment technology. Water from the aquifer can be introduced into the well through the lower screen pipe, and then injected into the aquifer from the upper screen pipe without bringing it out of the ground. At the same time, the groundwater is repeatedly circulated around the circulation well, and the volatile pollutants in the groundwater are continuously separated into gas and liquid and extracted to the ground for treatment, or discharged into the aeration zone through the upper screen pipe, and degraded by in-situ bioremediation methods until the pollutants are fully removed.

[0003] During the use of existing circulation wells, the volumes at the upper and lower ends of the well pipe are fixed, which easily causes a pressure difference between the aquifer and the well body, resulting in the diffusion and migration of pollutants in the formation, affecting the repair effect of the circulation well; at the same time, during the use of existing circulation wells, the water inlet and outlet holes are easily blocked, affecting the reliability of the circulation well; moreover, the existing circulation wells can only purify organic pollutants in groundwater, and it is difficult to remove LNAPL. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present invention provides an adjustable circulation well and method for treating LNAPL-contaminated groundwater.

[0005] The technical solution of the present invention is: an adjustable circulation well for LNAPL contaminated groundwater treatment, comprising a well body, a purification component movably arranged above the inside of the well body, an adjustable isolation component, and a circulation pump and an aerator arranged at the top of the well body; a well cover is movably connected to the top of the well body, and a plurality of water inlet grooves are equidistantly distributed below the outer wall of the well body;

[0006] The purification assembly includes a purification box, an aeration plate arranged at the bottom of the purification box, a floating plate slidably connected to the inside of the purification box, a number of oil removal rollers equidistantly distributed on the floating plate, and a driving motor arranged on the upper end surface of the floating plate and providing rotational power to each oil removal roller at the same time; each oil removal roller is covered with an oil absorption felt sleeve; a number of discharge pipes are equidistantly distributed at the bottom end of the outer wall of the purification box; slots are arranged on the side wall of the well body at positions corresponding to each discharge pipe; a sealing plate is slidably connected inside each slot, and each discharge pipe is connected to each sealing plate one by one; an extraction pipe connected to the purification box is arranged on the well cover;

[0007] The adjustable isolation assembly includes an isolation plate which is slidably engaged in the well body and located at the bottom end of the purification box, and a first electric rod which is arranged on the lower bottom surface of the well cover and connected to the upper end surface of the purification box;

[0008] The circulation pump is arranged on the upper end surface of the manhole cover, and the input end of the circulation pump is provided with a water inlet pipe which passes through the manhole cover and the isolation plate in sequence and extends to the bottom of the well body; the output end of the circulation pump is provided with a water outlet pipe which passes through the manhole cover and is connected to the outer wall of the purification box;

[0009] The aerator is arranged on the upper end surface of the manhole cover, and the output end of the aerator is provided with a first air inlet pipe which penetrates the manhole cover and is connected with the aeration plate.

[0010] Furthermore, each degreasing roller is rotatably connected to the floating plate through a rotating shaft, and a first bevel gear is arranged at one end of each rotating shaft close to each other; the output shaft of the driving motor passes through the floating plate and a second bevel gear is arranged on the output shaft and is meshed with each first bevel gear;

[0011] Description: The second bevel gear is driven to rotate by a driving motor, and the meshing action of the second bevel gear and the first bevel gear is utilized to make the rotating shaft and the degreasing drum rotate simultaneously, and the oil absorption felt sleeve on the degreasing drum is utilized to adsorb and remove LNAPL in the water body.

[0012] Furthermore, a collection box is provided on the upper end surface of the floating plate and at positions corresponding to the positions of each oil removal roller; a scraper abutting against the outer wall of the oil absorption felt sleeve is movably hinged inside the collection box; a spring push rod connected to the inner wall of the scraper is provided inside the collection box;

[0013] Description: During the rotation of the deoiling drum, the scraper is used to remove the LNAPL adsorbed on the oil absorption felt sleeve, and the removed LNAPL is collected by the collection box; by setting a spring push rod, the scraper is always in close contact with the oil absorption felt sleeve, thereby improving the effect of the scraper.

[0014] Furthermore, a mounting platform is provided at the upper end of the outer wall of the well body, and a protective sleeve sleeved on the outside of the well body is provided at the bottom end of the mounting platform; a number of opening plates are equidistantly distributed on the protective sleeve, and each opening plate is slidably engaged with the protective sleeve, and a vertical pole penetrating the mounting platform and slidably engaged with the mounting platform is provided at the top of each opening plate, and an arc-shaped tooth block is provided at the top of each vertical pole, and a connecting gear is rotatably engaged at the upper end surface of the mounting platform and corresponding to the position of each arc-shaped tooth block, and each connecting gear is meshed and connected with each arc-shaped tooth block one by one; an inner gear ring meshed with each connecting gear is rotatably engaged on the upper end surface of the mounting platform; a second electric rod movably hinged to the upper end surface of the mounting platform and movably hinged to the outer wall of the inner gear ring;

[0015] Description: By setting up a protective cover, soil particles can be prevented from clogging the water inlet trough on the well body when the well body enters the underground; when the well body is placed in the designated position underground, the second electric rod is used to push the inner gear ring to rotate on the mounting table, at which time each connecting gear rotates and drives the corresponding arc-shaped tooth block to move on the mounting table; during the movement of the arc-shaped tooth block, the corresponding opening plate is driven to slide on the protective cover to open the protective cover.

[0016] Furthermore, each opening plate has a limit seat at the top thereof which is slidably engaged with the bottom surface of the mounting platform;

[0017] Note: By setting the limit seat, it is helpful to improve the stability of the opening plate when it moves on the protective cover.

[0018] Furthermore, an equipment box located outside the inner gear ring is arranged on the upper end surface of the mounting platform; a filter screen is arranged inside each water inlet trough; a cleaning assembly is slidably connected to the inside of the side wall of the well body; the cleaning assembly includes a push sleeve slidably connected to the inside of the side wall of the well body, a cleaning brush arranged on the lower bottom surface of the push sleeve and respectively abutting against the outer side wall of each filter screen, and a push rod arranged on the upper end surface of the push sleeve and the upper end of which passes through the well body; a swing motor is arranged on the upper end surface of the equipment box, an eccentric disk is arranged at the output end of the swing motor, and the eccentric disk and the side wall of the push rod are movably hinged by a pull rod;

[0019] Description: The eccentric disk is driven to rotate by a swing motor. During the rotation of the eccentric disk, the push rod is pulled up and down inside the side wall of the well body by the pull rod. At this time, the push sleeve pushes each cleaning brush to move on the corresponding outer wall of the filter screen to clean the pollutants such as stones blocking the outside of the filter screen, thereby avoiding the filter screen being blocked by stones and improving the reliability of the present invention.

[0020] Furthermore, a mixing box is provided at the top of the purification box, the water outlet pipe is connected to the mixing box, and the mixing box and the purification box are connected through a transfer pipe; a spiral mixer is provided inside the mixing box, the spiral mixer is hollow inside, and an air nozzle is provided through the spiral mixer; a second air inlet pipe that penetrates the manhole cover and is connected to the spiral mixer is provided at the output end of the aerator;

[0021] Description: The aerator introduces external air into the spiral mixer through the second air inlet pipe. The external air is ejected through the air nozzle and contacts the contaminated groundwater, causing the pollutants in the contaminated groundwater to be oxidized and decomposed.

[0022] Furthermore, a barrier net is arranged inside the well body and above the water inlet trough, and a water purification filter material is arranged inside the well body and below the barrier net; the water purification filter material is bentonite particles with a particle size of 3-5 mm;

[0023] Description: Using water purification filter material to conduct primary filtration treatment on the contaminated groundwater entering the well body is beneficial to improving the remediation effect of the contaminated groundwater.

[0024] Furthermore, a positioning anchor rod is provided on the bottom surface of the mounting platform;

[0025] Note: Use positioning anchor rods to fix the mounting platform to the ground to prevent the well body from shifting during use and improve the stability of the well body.

[0026] The present invention also provides a method for treating LNAPL-contaminated groundwater, based on the above-mentioned adjustable circulation well for treating LNAPL-contaminated groundwater, comprising the following steps:

[0027] S1. Dig a groundwater restoration well and place the well body into the groundwater restoration well;

[0028] S2, polluted groundwater seeps into the bottom of the well body through the water inlet trough;

[0029] S3. The contaminated groundwater at the bottom of the well body is pumped out through the water inlet pipe by a circulating pump, and injected into the purification box through the water outlet pipe. The floating plate moves in real time with the change of the liquid level in the purification box; the aerator injects external air into the aeration plate through the first air inlet pipe, and aerates the contaminated groundwater, so that the volatile pollutants in the contaminated groundwater are oxidized and decomposed, and the volatile pollutants that are not oxidized and decomposed in the contaminated groundwater are extracted through the extraction pipe; the LNAPL in the contaminated groundwater floats on the water surface under the action of air flotation, and the oil removal drums are driven to rotate by the driving motor, and the LNAPL in the contaminated groundwater is adsorbed and removed by the oil absorption felt sleeve;

[0030] S4. The contaminated groundwater treated by S3 is injected into the soil through the discharge pipe to realize the circulation and restoration of the contaminated groundwater inside the well body;

[0031] S5. The position of the isolation disk inside the well body is adjusted by the first electric rod to balance the pumping between the underground aquifer and the circulation well; the movement of the isolation disk drives the purification assembly to move synchronously, and at this time, the discharge pipe drives the sealing plate to move up and down in the slot.

[0032] Compared with the prior art, the beneficial effects of the present invention are embodied in the following aspects:

[0033] First, the present invention has a reasonable structural design. A circulating pump is used to pump contaminated groundwater from the bottom of the well body to the inside of the purification box. During the aeration process of the contaminated groundwater, volatile pollutants in the contaminated groundwater are oxidized and decomposed. At the same time, the oil absorption felt sleeve is used to adsorb and purify the LNAPL in the contaminated groundwater. The purified contaminated groundwater is injected into the soil through the top of the well body side wall, thereby realizing the circulation purification of the contaminated groundwater.

[0034] Second, the present invention can flexibly adjust the space at the upper and lower ends of the isolation disk inside the well body by setting an isolation disk that moves up and down inside the well body, so that a circulation effect of pumping and injection balance is generated between the underground aquifer and the well body, avoiding the problem of pollution migration or diffusion caused by the drop in groundwater level and the change in groundwater flow direction, which is conducive to improving the restoration effect of polluted groundwater;

[0035] Third, the present invention provides a protective sleeve to prevent soil particles from entering the water inlet trough and the discharge pipe and causing blockage of the well body during the process of placing the well body into the groundwater repair well; at the same time, the cleaning component can be used to clean the filter screen inside the water inlet trough in real time, thereby improving the use stability and reliability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is a longitudinal section of a circulation well of the present invention;

[0037] Figure 2 is a top view of the circulation well of the present invention;

[0038] Figure 3 is a distribution diagram of the filter screen of the present invention on the well body;

[0039] Figure 4 It is a schematic diagram of the structure of the purification component of the present invention;

[0040] Figure 5 It is a schematic diagram of the connection between the floating plate and the purification box of the present invention;

[0041] Figure 6 It is a schematic diagram of the connection between the collection box and the oil removal drum of the present invention;

[0042] Figure 7 is a schematic diagram of the connection between the discharge pipe and the well body of the present invention;

[0043] Figure 8 It is a schematic diagram of the connection between the spiral mixer and the mixing box of the present invention;

[0044] Fig. 9 It is a schematic diagram of the connection between the opening plate and the protective cover of the present invention;

[0045] Fig.10 It is a schematic diagram of the connection between the inner gear ring, the connecting gear and the arc-shaped gear block of the present invention;

[0046] Fig.11 The present invention Figure 1 A local enlarged schematic diagram of the middle A;

[0047] Among them, 1-well body, 10-well cover, 100-extraction pipe, 11-water inlet trough, 110-filter screen, 12-slot, 13-mounting table, 130-positioning anchor rod, 14-equipment box, 15-barrier net, 2-purification component, 20-purification box, 21-aeration plate, 22-floating plate, 23-oil removal roller, 230-oil absorption felt sleeve, 231-rotating shaft, 232-first bevel gear, 24-drive motor, 240-second bevel gear, 25-discharge pipe, 250-sealing plate, 26-collection box, 260-scraper, 261-spring push rod, 27-mixing box, 270- Transfer pipe, 271- spiral mixer, 272- air nozzle, 3- adjustable sealing assembly, 30- sealing disc, 31- first electric rod, 4- circulating pump, 40- water inlet pipe, 41- water outlet pipe, 5- aerator, 50- first air inlet pipe, 51- second air inlet pipe, 6- protective cover, 60- opening plate, 600- vertical pole, 601- limit seat, 61- arc gear block, 62- connecting gear, 63- inner gear ring, 64- second electric rod, 7- cleaning assembly, 70- pushing sleeve, 71- cleaning brush, 72- pushing rod, 73- swing motor, 730- eccentric disk, 74- pull rod. DETAILED DESCRIPTION

[0048] Example 1: Figure 1 , Figure 3 The adjustable circulation well for treating LNAPL-contaminated groundwater shown in the figure comprises a well body 1, a purification assembly 2 movably arranged above the inside of the well body 1, an adjustable isolation assembly 3, and a circulation pump 4 and an aerator 5 arranged at the top of the well body 1; a well cover 10 is movably connected to the top of the well body 1, and 6 water inlet grooves 11 are evenly distributed below the outer wall of the well body 1;

[0049] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7As shown, the purification assembly 2 includes a purification box 20, an aeration plate 21 arranged at the bottom of the purification box 20, a floating plate 22 slidably connected to the inside of the purification box 20, three oil removal rollers 23 equidistantly distributed on the floating plate 22, and a driving motor 24 arranged on the upper end surface of the floating plate 22 and providing rotational power to each oil removal roller 23; each oil removal roller 23 is covered with an oil absorption felt sleeve 230; three discharge pipes 25 are equidistantly distributed at the bottom end of the outer wall of the purification box 20; and openings are arranged on the side wall of the well body 1 and at positions corresponding to the positions of each discharge pipe 25. The groove 12; each groove 12 is slidably clamped with a sealing plate 250, and each discharge pipe 25 is connected to each sealing plate 250 in a one-to-one correspondence; the manhole cover 10 is provided with an extraction pipe 100 connected to the purification box 20; each degreasing drum 23 is rotatably clamped on the floating plate 22 through a rotating shaft 231, and each end of the rotating shaft 231 close to each other is provided with a first bevel gear 232; the output shaft of the driving motor 24 passes through the floating plate 22 and the output shaft is provided with a second bevel gear 240 that is simultaneously meshed and connected with each first bevel gear 232;

[0050] like Figure 1 As shown, the adjustable isolation assembly 3 includes an isolation plate 30 which is slidably engaged in the well body 1 and located at the bottom end of the purification box 20, and a first electric rod 31 which is arranged on the lower bottom surface of the well cover 10 and connected to the upper end surface of the purification box 20;

[0051] like Figure 1 As shown, the circulation pump 4 is arranged on the upper end surface of the manhole cover 10, and the input end of the circulation pump 4 is provided with a water inlet pipe 40 which passes through the manhole cover 10 and the isolation disk 30 in sequence and extends to the bottom of the well body 1; the output end of the circulation pump 4 is provided with a water outlet pipe 41 which passes through the manhole cover 10 and is connected to the outer wall of the purification box 20;

[0052] like Figure 1 As shown, the aerator 5 is arranged on the upper end surface of the manhole cover 10 , and the output end of the aerator 5 is provided with a first air inlet pipe 50 that penetrates the manhole cover 10 and is connected to the aeration plate 21 .

[0053] Example 2: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 1, comprising the following steps:

[0054] S1, digging a groundwater restoration well, and placing the well body 1 into the groundwater restoration well;

[0055] S2, polluted groundwater seeps into the bottom of the well body 1 through the water inlet trough 11;

[0056] S3, the contaminated groundwater at the bottom of the well body 1 is extracted through the water inlet pipe 40 by the circulation pump 4, and injected into the purification box 20 through the water outlet pipe 41, and the floating plate 22 moves in real time with the change of the liquid level in the purification box 20; the aerator 5 injects external air into the aeration plate 21 through the first air inlet pipe 50, and aerates the contaminated groundwater, so that the volatile pollutants in the contaminated groundwater are oxidized and decomposed, and the volatile pollutants that are not oxidized and decomposed in the contaminated groundwater are extracted through the extraction pipe 100; the LNAPL in the contaminated groundwater floats on the water surface under the action of air flotation, and the second bevel gear 240 is driven to rotate by the driving motor 24, and the second bevel gear 240 and the first bevel gear 232 are meshed to make the rotating shaft 231 and the degreasing drum 23 rotate at the same time, and the oil absorption felt sleeve 230 on the degreasing drum 23 is used to adsorb and remove the LNAPL in the water body;

[0057] S4, the contaminated groundwater treated in S3 is injected into the soil through the discharge pipe 25, so as to realize the circulation and restoration of the contaminated groundwater inside the well body 1;

[0058] S5. The position of the isolation disk 30 inside the well body 1 is adjusted by the first electric rod 31 to balance the pumping between the underground aquifer and the circulation well; the isolation disk 30 drives the purification component 2 to move during its movement, and at this time, the discharge pipe 25 drives the sealing plate 250 to move up and down in the groove 12.

[0059] Embodiment 3: This embodiment differs from Embodiment 1 in that eight water inlet tanks 11 are provided, six degreasing rollers 23 are provided, and seven discharge pipes 25 are provided.

[0060] Embodiment 4: This embodiment differs from Embodiment 1 in that Figure 5 , Figure 6 As shown, a collecting box 26 is provided on the upper end surface of the floating plate 22 and at the position corresponding to each oil removal roller 23; a scraper 260 is movably hinged inside the collecting box 26 and abuts against the outer wall of the oil absorption felt sleeve 230; a spring push rod 261 connected to the inner wall of the scraper 260 is provided inside the collecting box 26;

[0061] By providing the collecting box 26 and the scraper 260 , it is convenient to transfer the LNAPL adsorbed on the oil absorption felt sleeve 230 , thereby increasing the service life of the oil absorption felt sleeve 230 .

[0062] Example 5: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 4, which differs from Example 2 in that:

[0063] In step S3, during the rotation of the deoiling drum 23, the scraper 260 is used to remove the LNAPL adsorbed on the oil absorption felt sleeve 230, and the removed LNAPL is collected by the collecting box 26; the scraper 260 is always in close contact with the oil absorption felt sleeve 230 under the action of the spring push rod 261.

[0064] Embodiment 6: This embodiment differs from Embodiment 4 in that Figure 1 , Fig. 9 , Fig.10 , Fig.11 As shown, a mounting platform 13 is provided at the upper end of the outer wall of the well body 1, and a protective sleeve 6 is provided at the bottom end of the mounting platform 13 and is sleeved on the outside of the well body 1; three opening plates 60 are evenly distributed on the protective sleeve 6, and each opening plate 60 is slidably engaged with the protective sleeve 6, and the top of each opening plate 60 is provided with a vertical rod 600 that penetrates the mounting platform 13 and is slidably engaged with the mounting platform 13, and the top of each vertical rod 600 is provided with an arc-shaped tooth block 61, and the upper end surface of the mounting platform 13 and each arc-shaped tooth block 61 is provided. The corresponding positions of the arc-shaped tooth blocks 61 are all rotatably connected with connecting gears 62, and each connecting gear 62 is meshed and connected with each arc-shaped tooth block 61 one by one; the upper end surface of the mounting platform 13 is rotatably connected with an inner gear ring 63 meshed and connected with each connecting gear 62; the upper end surface of the mounting platform 13 is movably hinged with a second electric rod 64 movably hinged with the outer wall of the inner gear ring 63; the top of each opening plate 60 is provided with a limit seat 601 slidably connected with the bottom surface of the mounting platform 13;

[0065] By providing the protective sleeve 6 , it is possible to prevent soil particles from clogging the water inlet groove 11 on the well body 1 when the well body 1 enters the underground.

[0066] Example 7: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 6, and differs from Example 5 in that:

[0067] After step S1 is completed, the second electric rod 64 is used to push the inner gear ring 63 to rotate on the mounting platform 13. At this time, each connecting gear 62 rotates and drives the corresponding arc-shaped tooth block 61 to move on the mounting platform 13; during the movement of the arc-shaped tooth block 61, the corresponding opening plate 60 is driven to slide on the protective cover 6 to open the protective cover 6.

[0068] Embodiment 8: This embodiment is different from Embodiment 6 in that five opening plates 60 are provided.

[0069] Embodiment 9: This embodiment differs from Embodiment 6 in that Figure 1 , Figure 2 , Figure 3As shown, the upper end surface of the mounting platform 13 is provided with an equipment box 14 located outside the inner gear ring 63; each water inlet trough 11 is provided with a filter screen 110; a cleaning assembly 7 is slidably connected to the inner side wall of the well body 1; the cleaning assembly 7 includes a push sleeve 70 slidably connected to the inner side wall of the well body 1, a cleaning brush 71 arranged on the lower bottom surface of the push sleeve 70 and respectively abutting against the outer side wall of each filter screen 110, and a push rod 72 arranged on the upper end surface of the push sleeve 70 and the upper end of which passes through the well body 1; the upper end surface of the equipment box 14 is provided with a swing motor 73, and the output end of the swing motor 73 is provided with an eccentric disk 730, and the eccentric disk 730 and the side wall of the push rod 72 are movably hinged through a pull rod 74;

[0070] The cleaning component 7 can be used to clean the pollutants such as stones blocking the outside of the filter 110, so as to prevent the stones from clogging the filter 110 and improve the reliability of the present invention.

[0071] Example 10: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 9. The difference from Example 7 is that it further includes step S6.

[0072] S6. The eccentric disk 730 is driven to rotate by the swing motor 73. During the rotation of the eccentric disk 730, the push rod 72 is pulled up and down inside the side wall of the well body 1 by the pull rod 74. At this time, the push sleeve 70 pushes each cleaning brush 71 to move on the outer wall of the corresponding filter screen 110 to clean the pollutants such as stones blocking the outside of the filter screen 110.

[0073] Embodiment 11: This embodiment differs from Embodiment 9 in that Figure 1 , Figure 8 As shown, a mixing box 27 is provided at the top of the purification box 20, and a water outlet pipe 41 is connected to the mixing box 27, and the mixing box 27 and the purification box 20 are connected through a transfer pipe 270; a spiral mixer 271 is provided inside the mixing box 27, and the spiral mixer 271 is hollow inside, and an air nozzle 272 is penetrated on the spiral mixer 271; a second air inlet pipe 51 is provided at the output end of the aerator 5, which penetrates the manhole cover 10 and is communicated with the spiral mixer 271;

[0074] The spiral mixer 271 is provided to improve the contact effect between the contaminated groundwater and the external air, and to improve the oxidative decomposition efficiency of the volatile pollutants in the contaminated groundwater.

[0075] Example 12: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 11, and differs from Example 10 in that:

[0076] In step S3, water from the outlet pipe 41 first enters the interior of the mixing box 27, and the aerator 5 passes external air into the interior of the spiral mixer 271 through the second air inlet pipe 51. The external air is ejected through the air nozzle 272 and contacts the contaminated groundwater. After contacting the air, the volatile pollutants in the contaminated groundwater are initially oxidized and decomposed. The contaminated groundwater then enters the interior of the purification box 20 through the transfer pipe 270 for secondary oxidation and decomposition.

[0077] Embodiment 13: This embodiment differs from Embodiment 11 in that Figure 1 As shown, a barrier net 15 is arranged inside the well body 1 and above the water inlet trough 11, and a water purification filter material is arranged inside the well body 1 and below the barrier net 15; the water purification filter material is bentonite particles with a particle size of 3-5 mm.

[0078] Example 14: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 13, and differs from Example 12 in that:

[0079] In step S2, after the contaminated groundwater infiltrates into the bottom of the well body 1 through the water inlet trough 11, it first passes through the water purification filter material, and the contaminated groundwater is subjected to primary filtration treatment using the water purification filter material.

[0080] Embodiment 15: This embodiment differs from Embodiment 13 in that Figure 1 As shown, a positioning anchor rod 130 is provided on the bottom surface of the mounting platform 13 .

[0081] Example 16: This example describes a method for treating LNAPL-contaminated groundwater, based on the adjustable circulation well for treating LNAPL-contaminated groundwater in Example 13, and differs from Example 12 in that:

[0082] After step S1 is completed, the mounting platform 13 is fixed to the ground using the positioning anchor rods 130 .

[0083] It should be noted that the drive motor 24, spiral mixer 271, air nozzle 272, first electric rod 31, circulation pump 4, aerator 5, second electric rod 64 and swing motor 73 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. An adjustable circulation well for LNAPL contaminated groundwater treatment, characterized in that: It comprises a well body (1), a purification component (2) movably arranged above the inside of the well body (1), an adjustable isolation component (3), and a circulation pump (4) and an aerator (5) arranged at the top of the well body (1); a well cover (10) is movably connected to the top of the well body (1), and a plurality of water inlet grooves (11) are evenly distributed below the outer wall of the well body (1); The purification assembly (2) comprises a purification box (20), an aeration plate (21) arranged at the bottom of the purification box (20), a floating plate (22) slidably engaged with the inside of the purification box (20), a plurality of oil removal rollers (23) equidistantly distributed on the floating plate (22), and a driving motor (24) arranged on the upper end surface of the floating plate (22) and providing rotational power to each of the oil removal rollers (23); each of the oil removal rollers (23) is provided with an oil absorption roller sleeve on the outside. A felt sleeve (230); a plurality of discharge pipes (25) are equidistantly distributed at the bottom end of the outer wall of the purification box (20); slots (12) are provided on the side wall of the well body (1) at positions corresponding to the positions of the discharge pipes (25); a sealing plate (250) is slidably engaged inside each of the slots (12), and each of the discharge pipes (25) is connected to each of the sealing plates (250) in a one-to-one correspondence; an extraction pipe (100) connected to the purification box (20) is provided on the well cover (10); The adjustable isolation assembly (3) comprises an isolation plate (30) which is slidably engaged in the well body (1) and located at the bottom end of the purification box (20), and a first electric rod (31) which is arranged on the lower bottom surface of the well cover (10) and connected to the upper end surface of the purification box (20); The circulation pump (4) is arranged on the upper end surface of the well cover (10); the input end of the circulation pump (4) is provided with a water inlet pipe (40) which passes through the well cover (10) and the isolation disk (30) in sequence and extends to the bottom of the well body (1); the output end of the circulation pump (4) is provided with a water outlet pipe (41) which passes through the well cover (10) and is connected to the outer wall of the purification box (20); The aerator (5) is arranged on the upper end surface of the manhole cover (10), and the output end of the aerator (5) is provided with a first air inlet pipe (50) that penetrates the manhole cover (10) and is connected to the aeration plate (21).

2. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 1, characterized in that: Each of the oil removal rollers (23) is rotatably clamped on the floating plate (22) via a rotating shaft (231), and a first bevel gear (232) is provided at one end of each of the rotating shafts (231) close to each other; an output shaft of the drive motor (24) passes through the floating plate (22), and a second bevel gear (240) is provided on the output shaft and is meshed with each of the first bevel gears (232).

3. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 2, characterized in that: A collecting box (26) is provided on the upper end surface of the floating plate (22) and at a position corresponding to each of the oil removal rollers (23); a scraper (260) is movably hinged inside the collecting box (26) and abuts against the outer wall of the oil absorption felt sleeve (230); and a spring push rod (261) connected to the inner wall of the scraper (260) is provided inside the collecting box (26).

4. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 1, characterized in that: The upper end of the outer wall of the well body (1) is provided with a mounting platform (13), and the bottom end of the mounting platform (13) is provided with a protective sleeve (6) which is sleeved on the outside of the well body (1); a plurality of opening plates (60) are evenly distributed on the protective sleeve (6), and each of the opening plates (60) is slidably engaged with the protective sleeve (6); the top end of each of the opening plates (60) is provided with a vertical rod (600) which passes through the mounting platform (13) and is slidably engaged with the mounting platform (13), and the top end of each of the vertical rods (600) is provided with an arc The mounting platform (13) is provided with a plurality of arc-shaped tooth blocks (61); a connecting gear (62) is rotatably connected to the upper end surface of the mounting platform (13) at positions corresponding to the positions of the respective arc-shaped tooth blocks (61); and the respective connecting gears (62) are meshingly connected to the respective arc-shaped tooth blocks (61) in a one-to-one correspondence; an inner gear ring (63) is rotatably connected to the upper end surface of the mounting platform (13) and meshingly connected to the respective connecting gears (62); and a second electric rod (64) is movably hinged to the upper end surface of the mounting platform (13) and is movably hinged to the outer side wall of the inner gear ring (63).

5. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 4, characterized in that: The top of each opening plate (60) is provided with a limiting seat (601) which is slidably engaged with the bottom surface of the mounting platform (13).

6. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 4, characterized in that: The upper end surface of the mounting platform (13) is provided with an equipment box (14) located outside the inner gear ring (63); each of the water inlet grooves (11) is provided with a filter screen (110); a cleaning assembly (7) is slidably engaged with the inside of the side wall of the well body (1); the cleaning assembly (7) comprises a push sleeve (70) slidably engaged with the inside of the side wall of the well body (1), a cleaning brush (71) provided on the lower bottom surface of the push sleeve (70) and respectively abutting against the outer side wall of each of the filter screens (110), and a push rod (72) provided on the upper end surface of the push sleeve (70) and the upper end of which passes through the well body (1); the upper end surface of the equipment box (14) is provided with a swing motor (73); an eccentric disk (730) is provided at the output end of the swing motor (73); the eccentric disk (730) and the side wall of the push rod (72) are movably hinged via a pull rod (74).

7. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 4, characterized in that: A mixing box (27) is arranged at the top of the purification box (20); the water outlet pipe (41) is in communication with the mixing box (27); the mixing box (27) and the purification box (20) are connected via a transfer pipe (270); a spiral mixer (271) is arranged inside the mixing box (27); the spiral mixer (271) is hollow inside, and an air nozzle (272) is provided through the spiral mixer (271); and a second air inlet pipe (51) is provided at the output end of the aerator (5), which penetrates the manhole cover (10) and is in communication with the spiral mixer (271).

8. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 4, characterized in that: A barrier net (15) is provided inside the well body (1) and above the water inlet trough (11), and a water purification filter material is provided inside the well body (1) and below the barrier net (15).

9. The adjustable circulation well for LNAPL contaminated groundwater treatment according to claim 4, characterized in that: A positioning anchor rod (130) is provided on the lower surface of the mounting platform (13).

10. A method for treating LNAPL contaminated groundwater, based on the adjustable circulation well for treating LNAPL contaminated groundwater according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, digging a groundwater restoration well, and placing the well body (1) into the groundwater restoration well; S2, polluted groundwater seeps into the bottom of the well body (1) through the water inlet trough (11); S3, the contaminated groundwater at the bottom of the well body (1) is pumped out through the water inlet pipe (40) by the circulation pump (4), and injected into the purification box (20) through the water outlet pipe (41), and the floating plate (22) moves in real time with the change of the liquid level in the purification box (20); the aerator (5) injects external air into the aeration plate (21) through the first air inlet pipe (50), and performs aeration treatment on the contaminated groundwater, so that the volatile pollutants in the contaminated groundwater are oxidized and decomposed, and the volatile pollutants that are not oxidized and decomposed in the contaminated groundwater are extracted through the extraction pipe (100); the LNAPL in the contaminated groundwater floats on the water surface under the action of air flotation, and the oil removal rollers (23) are driven to rotate by the driving motor (24), and the LNAPL in the contaminated groundwater is adsorbed and removed by the oil absorption felt sleeve (230); S4, the contaminated groundwater treated in S3 is injected into the soil through the discharge pipe (25), thereby realizing the circulation and restoration of the contaminated groundwater inside the well body (1); S5. The position of the isolation disk (30) inside the well body (1) is adjusted by the first electric rod (31) so that the pumping and injection between the underground aquifer and the circulation well are balanced; the isolation disk (30) drives the purification component (2) to move synchronously during the movement, and at this time, the discharge pipe (25) drives the sealing plate (250) to move up and down in the slot (12).

Images