A groundwater circulation well repair system

Abstract

This invention discloses a groundwater circulation well remediation system, comprising an outer well, an inner well, and a water injection / extraction assembly. A spiral flow channel is installed within the inner well. The water injection / extraction assembly pumps groundwater from the lower screen section cavity to the upper end of the spiral flow channel. The groundwater flows downwards within the spiral flow channel, increasing the hydraulic residence time and making it easier for contaminants in the groundwater to be degraded by the enhanced treatment module. The screen section of the enhanced treatment module is flushed by the spirally descending groundwater, and under centrifugal force, clogging of the enhanced treatment module is effectively prevented. Furthermore, the spiral flow of groundwater creates a force perpendicular to the axis on the screen holes of the upper screen section, reducing the risk of clogging. This invention incorporates an inner well within the upper screen section, achieving a dual circulation mode both inside and outside the well. By adjusting the circulation rate and direction within the well through the water injection / extraction assembly, backwashing of the upper and lower screen holes by groundwater is achieved, alleviating clogging of the upper and lower screen holes by mineral deposits.

Description

Technical Field

[0001] This invention relates to the field of environmental pollution treatment technology, specifically to a groundwater circulation well remediation system. Background Technology

[0002] Site remediation technologies are mainly divided into two types: in-situ remediation and ex-situ remediation. In-situ remediation refers to direct remediation within the contaminated area without excavation or transportation of contaminated soil. In-situ remediation does not damage the original soil structure and is relatively effective for areas with deep contamination. In-situ remediation technologies mainly include in-situ extraction, in-situ chemical leaching, in-situ chemical oxidation, and in-situ microbial remediation. Ex-situ remediation refers to excavating or extracting contaminated soil from its original location and transporting it to another site for remediation. Ex-situ remediation damages the original soil structure, making it difficult to treat deeply contaminated areas, and it has high operating costs and lower applicability than in-situ soil remediation. Ex-situ soil remediation technologies mainly include ex-situ landfill, ex-situ solidification, ex-situ chemical leaching, ex-situ chemical solidification and stabilization, ex-situ thermal treatment, and a series of ex-situ bioremediation methods.

[0003] In recent years, circulating well technology (GCW), which has become increasingly popular in China, integrates multiple technologies such as in-situ extraction, chemical oxidation, and enhanced microbial remediation into a circulating well. Compared to traditional in-situ remediation technologies, which suffer from long remediation times and low pollutant removal rates, GCW technology can significantly shorten remediation time and improve removal efficiency. As an in-situ remediation method, GCW technology has become a research hotspot in my country's groundwater treatment field due to its advantages such as minimal disturbance to the formation structure and a wide impact range. However, the effectiveness of existing GCW technology is significantly affected by factors such as the thickness of the saturated zone of the aquifer at the remediation site, the regional flow regime, and the horizontal and vertical permeability coefficients. The enhanced treatment modules and screens within the GCW are prone to clogging, which can even lead to the GCW's shutdown in severe cases. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the enhanced treatment module of the circulating well and the easy emission blockage of the screen hole in the prior art, thereby providing a groundwater circulating well repair system.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] A groundwater circulation well remediation system includes: an outer well, an inner well, and a pumping and injection assembly. The outer well is equipped with a packer adapted to divide it into an upper screen section and a lower screen section. An upper screen hole is formed on the top sidewall of the upper screen section, and a lower screen hole is formed on the sidewall of the lower screen section. The inner well is located within the upper screen section, and its top is sealed with an inner well cover. A spiral flow channel is formed within the cavity of the inner well, and the bottom of the spiral flow channel communicates with the cavity of the upper screen section. A strengthening treatment module is provided within the spiral flow channel. The pumping and injection assembly has one end inserted through the packer to extend into the cavity of the lower screen section, and the other end inserted through the inner well cover to extend and communicate with the upper end of the spiral flow channel. The pumping and injection assembly is adapted to connect the lower screen section and the spiral flow channel.

[0007] According to some embodiments of the present invention, the inner well is provided with a central shaft tube, one end of which passes through the inner well cover to extend out of the inner well. The inner well includes a first well section, a pollution treatment section, and a second well section arranged sequentially from top to bottom. The upper end of the pollution treatment section is detachably connected to the lower end of the first well section, and the lower end of the pollution treatment section is detachably connected to the upper end of the second well section. The central shaft tube passes through the first well section, the pollution treatment section, and the second well section in sequence. The first well section is provided with a first vortex blade, and the first well section, the first vortex blade, and the central shaft tube form a first vortex cavity. The second well section is provided with a second vortex blade, and the second well section, the second vortex blade, and the central shaft tube form a second vortex cavity. The pollution treatment section is provided with a treatment cavity. The first vortex cavity, the treatment cavity, and the second vortex cavity are sequentially connected to form the spiral flow channel. The pollution treatment section is provided with an enhanced treatment module.

[0008] According to some embodiments of the present invention, the enhancement treatment module includes a microbial enhancement treatment module, a chemical oxidation module, or an electrochemical module.

[0009] According to some embodiments of the present invention, both the first swirling cavity and the second swirling cavity are provided with pH value detection devices.

[0010] According to some embodiments of the present invention, the outer wall of the inner well and the inner wall of the outer well are connected by a flexible connecting device.

[0011] According to some embodiments of the present invention, the water injection assembly includes a water injection pump, a first water injection pipe, and a second water injection pipe; the first water injection pipe passes through the central shaft tube, and one end passes through the packer to extend to communicate with the inner cavity of the lower screen section, and the other end communicates with the water inlet of the water injection pump; the upper end of the central shaft tube is provided with a through hole, one end of the second water injection pipe communicates with the upper end of the spiral flow channel through the through hole, and the other end of the second water injection pipe communicates with the water outlet of the water injection pipe.

[0012] According to some embodiments of the present invention, the groundwater circulation well repair system further includes a gas distribution assembly, which includes a gas pump, a gas distribution pipe, and a gas distribution plate. The gas pump is located on the ground, one end of which is connected to one end of the gas distribution pipe. The other end of the gas distribution pipe passes through the central shaft pipe and extends to the bottom of the upper screen section. The other end of the gas distribution pipe is connected to the gas distribution plate, which is located below the inner well.

[0013] According to some embodiments of the present invention, the groundwater circulation well repair system further includes an exhaust gas purification component, which includes an air pump, an exhaust gas collection pipe, and a purification treatment structure. The top of the outer well is provided with an outer well cover. One end of the exhaust gas collection pipe is connected to the air inlet of the air pump, and the other end of the exhaust gas collection pipe passes through the outer well cover to extend into the cavity of the upper screen section. The purification treatment structure is connected to the air outlet of the air pump. The air pump is adapted to transport the exhaust gas in the cavity of the upper screen section to the purification treatment structure for purification treatment through the exhaust gas collection pipe.

[0014] According to some embodiments of the present invention, the inner well cover is provided with a VOC gas collection pipe, one end of the VOC gas collection pipe is connected to the spiral flow channel, and the other end of the VOC gas collection pipe extends to the upper end of the upper screen section and is arranged opposite to the exhaust gas collection pipe.

[0015] According to some embodiments of the present invention, a gas-liquid separator is provided between the purification structure and the vacuum pump. One end of the gas-liquid separator is connected to the outlet end of the vacuum pump, and the other end is connected to the purification structure. The gas-liquid separator is adapted to perform gas-liquid separation on the VOC gas.

[0016] According to some embodiments of the present invention, the groundwater circulation well repair system further includes a repair reagent injection assembly, the repair reagent injection assembly including a dosing pipe, one end of the dosing pipe passing through the inner well cover to extend to communicate with the upper end of the spiral flow channel, the other end of the dosing pipe communicating with a reagent bottle, and a flow meter and / or flow rate regulating valve being provided between the dosing pipe and the reagent bottle.

[0017] According to some embodiments of the present invention, the groundwater circulation well remediation system further includes a dredging component, which includes a sludge extraction pipe, a sludge collection box, and a sludge extraction pump. The sludge extraction pump is located on the ground, the sludge collection box is located below the spiral flow channel and is correspondingly arranged to the bottom opening of the spiral flow channel, one end of the sludge extraction pipe is connected to the sludge collection box, the other end of the sludge extraction pipe is connected to the inlet end of the sludge extraction pump, and the outlet end of the sludge extraction pump is connected to a sludge tank.

[0018] The technical solution of this invention has the following advantages:

[0019] 1. The groundwater circulation well repair system provided by this invention features a spiral flow channel inside the inner well. The pumping and injection assembly pumps groundwater from the lower screen section cavity to the upper end of the spiral flow channel. The groundwater flows downwards within the spiral flow channel, increasing the hydraulic residence time and making it easier for contaminants in the groundwater to be degraded by the enhanced treatment module. The screen section of the enhanced treatment module is flushed by the spirally descending groundwater, and under centrifugal force, blockage of the enhanced treatment module is effectively prevented. Furthermore, the spiral flow of groundwater creates a force perpendicular to the axis on the screen holes of the upper screen section, reducing the risk of blockage. This invention incorporates an inner well within the upper screen section, achieving a dual circulation mode inside and outside the well. By adjusting the circulation rate and direction within the well using the pumping and injection assembly, the groundwater backwashes the upper and lower screen holes, alleviating blockage caused by mineral precipitation.

[0020] 2. The groundwater circulation well repair system provided by the present invention extends the hydraulic residence time by setting a spiral flow channel, and has a certain stirring and mixing effect during the spiral descent, which is conducive to the decomposition reaction of groundwater in the enhanced treatment module and can effectively improve the decomposition efficiency of pollutants in groundwater.

[0021] 3. The groundwater circulation well repair system provided by this invention includes an inner well comprising a first well section, a pollution treatment section, and a second well section arranged sequentially from top to bottom. The upper end of the pollution treatment section is detachably connected to the lower end of the first well section, and the lower end of the pollution treatment section is detachably connected to the upper end of the second well section. The pollution treatment section is equipped with an enhanced treatment module. By quickly disassembling and replacing the pollution treatment section, multiple treatment technologies can be coupled. The pollution treatment section can be replaced according to the actual conditions of different sites, different stages of the same site, and different areas of the same site, thereby enabling the replacement of the enhanced treatment module, improving flexibility, and shortening the repair cycle and improving repair efficiency by coupling multiple technical means.

[0022] 4. The groundwater circulation well remediation system provided by the present invention includes a pH detection device installed in the first vortex chamber and the second vortex chamber to detect the pH value of the groundwater in the first vortex chamber and the second vortex chamber respectively. By comparing the changes in the pH value of the groundwater in the first vortex chamber and the second vortex chamber, the decomposition state of pollutants in the groundwater by the enhanced treatment module can be inferred, so as to adjust the flow rate of the agent and achieve precise operation.

[0023] 5. The groundwater circulation well repair system provided by the present invention connects the outer wall of the inner well and the inner wall of the outer well through a flexible connection device to fix the inner well. The connection through the flexible connection device avoids blockage of groundwater and reduces the resistance of groundwater operation to ensure smooth circulation.

[0024] 6. The groundwater circulation well remediation system provided by the present invention connects the upper and lower screen sections through the water pumping and injection components. By adjusting the power and speed of the water pump, the flow velocity of the groundwater in the circulation well is adjusted so that the flow direction and velocity of the groundwater match the distribution of the pollution plume, thereby improving the remediation efficiency.

[0025] 7. The groundwater circulation well repair system provided by the present invention uses an air pump to deliver air to an air distribution plate through an air distribution pipe. The air distribution plate is located below the inner well. The air distribution plate dissolves oxygen in the air into the groundwater, thereby increasing the oxygen content of the groundwater and improving the oxidation efficiency of metal pollutants in the groundwater. In addition, it can also promote the decomposition of organic pollutants in the groundwater and improve the purification efficiency.

[0026] 8. The groundwater circulation well repair system provided by the present invention purifies the VOC gas generated by groundwater purification by setting up an exhaust gas purification component. The exhaust pump draws the VOC gas in the upper screen section into the purification treatment structure through the exhaust gas collection pipe for decomposition treatment, thus avoiding secondary pollution of the environment by the VOC gas.

[0027] 9. In the groundwater circulation well remediation system provided by this invention, when the enhanced treatment module is a microbial treatment module or an electrochemical oxidation treatment module, nutrients or oxidizing agents need to be introduced into the circulation well. One end of the dosing pipe flows through the upper end of the spiral flow channel. By setting the dosing pipe, nutrients or chemical agents are injected into the spiral flow channel. The nutrients or chemical agents descend with the groundwater vortex, thereby decomposing pollutants. A flow meter and / or flow rate regulating valve are set between the dosing pipe and the agent bottle to adjust the flow rate, mass, and dosing time of nutrients or chemical agents according to the actual situation of groundwater pollutants, thereby achieving precise treatment and improving the decomposition efficiency of pollutants in groundwater.

[0028] 10. In the groundwater circulation well remediation system provided by the present invention, when the enhanced treatment module is a microbial module, organic pollutants accumulate to form sludge during the decomposition treatment of groundwater. A sludge collection box is set below the spiral flow channel. As the groundwater spirals down, the sludge generated in the enhanced treatment module flows into the sludge collection box with the groundwater. The sludge extraction pump draws the sludge in the sludge collection box into a sludge pool located on the ground through the sludge extraction pipe, thus avoiding the accumulation of sludge in the circulation well and the blockage of the screen holes. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a simplified structural diagram of the circulating well pumping and injection operation state provided in some embodiments of the present invention;

[0031] Figure 2 for Figure 1 The diagram shown is a partially enlarged view.

[0032] Figure 3 This is a schematic diagram of the external structure of the inner well provided in some embodiments of the present invention;

[0033] Figure 4 This is a half-sectional schematic diagram of the installation structure of the first well section and the pollution treatment section provided in some embodiments of the present invention;

[0034] Figure 5 This is a partial cross-sectional view of the second well section and the outer well section provided in some embodiments of the present invention;

[0035] Figure 6 This is a partial schematic diagram of the upper part of the central tube provided in some embodiments of the present invention.

[0036] Explanation of reference numerals in the attached diagram: 1. Outer well; 2. Inner well; 3. Pumping and injection assembly; 4. Gas distribution assembly; 5. Tail gas purification assembly; 6. Repair reagent injection assembly; 7. Dredging assembly; 8. Flexible connection device; 11. Packer; 12. Upper screen section; 13. Lower screen section; 14. Outer well cover; 121. Upper screen hole; 131. Lower screen hole; 21. First well section; 22. Pollution treatment section; 23. Second well section; 24. Central shaft pipe; 25. Inner well cover; 26. VOC gas guide pipe; 211. First Rotary blade; 231, Second rotary blade; 241, Through hole; 31, First water injection pipe; 32, Second water injection pipe; 33, Water injection pump; 41, Air distribution pipe; 42, Air distribution plate; 43, Air pump; 51, Tail gas collection pipe; 52, Air extraction pump; 53, Purification treatment structure; 54, Gas-liquid separator; 61, Dosing pipe; 62, Chemical bottle; 63, Flow meter; 64, Flow rate regulating valve; 71, Sludge extraction pipe; 72, Sludge collection box; 73, Sludge extraction pump; 74, Sludge tank. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Reference Figure 1 and Figure 2 As shown, some embodiments of the present invention provide a groundwater circulation well repair system, including: an outer well 1, an inner well 2, and a water injection / extraction assembly 3. The outer well 1 is provided with a packer 11, which is adapted to divide the outer well 1 into an upper screen section 12 and a lower screen section 13. An upper screen hole 121 is opened on the top side wall of the upper screen section 12, and a lower screen hole 131 is opened on the side wall of the lower screen section 13. The inner well 2 is located in the upper screen section 12. The top of the inner well 2 is sealed with an inner well cover 25. A spiral flow channel is formed in the well cavity of the inner well 2. The bottom of the spiral flow channel is connected to the cavity of the upper screen section 12. A strengthening treatment module is provided in the spiral flow channel. One end of the water injection / extraction assembly 3 passes through the packer 11 to extend into the cavity of the lower screen section 13, and the other end passes through the inner well cover 25 to extend and connect with the upper end of the spiral flow channel. The water injection / extraction assembly 3 is adapted to connect the lower screen section 13 and the spiral flow channel.

[0042] Specifically, a spiral flow channel is set inside the inner well 2. The water injection component 3 pumps groundwater from the lower screen section 13 cavity to the upper end of the spiral flow channel. The groundwater flows from top to bottom in the spiral flow channel, increasing the hydraulic residence time. This makes it easier for pollutants in the groundwater to be degraded by the enhanced treatment module. The screen section of the enhanced treatment module is flushed by the spirally descending groundwater, and under the action of centrifugal force, it can effectively avoid clogging of the enhanced treatment module. In addition, the spiral flow of groundwater forms a force perpendicular to the axis on the screen holes of the upper screen section 12, which can reduce the risk of clogging of the upper screen holes 121. This invention sets an inner well 2 inside the upper screen section 12 to realize a dual circulation mode inside and outside the well. By adjusting the circulation rate and direction inside the well through the water injection component 3, the groundwater backwashes the upper screen holes 121 and the lower screen holes 131, alleviating the clogging of the upper screen holes 121 and the lower screen holes 131 by sediment.

[0043] Reference Figure 1 As shown, it can be understood that during groundwater purification, the pumping and injection assembly 3 operates in a bottom-pumping and top-injection mode. Specifically, at this time, the upper screen hole 121 is the outlet and the lower screen hole 131 is the inlet. The pumping and injection assembly 3 pumps the lower screen section 13, creating a negative pressure in the lower screen section 13. Groundwater enters the cavity of the lower screen section 13 through the lower screen hole 131. The pumping and injection system injects the groundwater pumped from the lower screen section 13 into the upper end of the spiral flow channel of the inner well 2. Under the action of hydraulic force, the groundwater flows from top to bottom along the spiral flow channel, undergoes purification and decomposition treatment in the enhanced treatment module, and then enters the cavity of the upper screen section 12, flowing out from the upper screen hole 121.

[0044] By setting a spiral flow channel in inner well 2, the hydraulic residence time is extended, and the spiral descent process has a certain stirring effect, which is conducive to the decomposition reaction of groundwater in the enhanced treatment module and can effectively improve the decomposition efficiency of pollutants in groundwater.

[0045] Understandably, after a period of pumping down and injecting up, when the lower screen hole 131 and the upper screen hole 121 become blocked, the pumping and injecting water assembly 3 can be used to achieve the reverse operation mode of pumping up and injecting down, so as to increase the influence radius of the circulation well and reduce the degree of blockage of the screen holes.

[0046] Reference Figure 3 , Figure 4 and Figure 5As shown, in some embodiments of the present invention, the inner well 2 is provided with a central shaft pipe 24, one end of which passes through the inner well cover 25 to extend out of the inner well 2. The inner well 2 includes a first well section 21, a pollution treatment section 22, and a second well section 23 arranged sequentially from top to bottom. The upper end of the pollution treatment section 22 is detachably connected to the lower end of the first well section 21, and the lower end of the pollution treatment section 22 is detachably connected to the lower end of the second well section 23. The central shaft pipe 24 passes sequentially through the first well section 21 and the pollution treatment section 23. 2. The first well section 21 is provided with a first swirl vane 211. The first well section 21, the first swirl vane 211 and the central tube 24 form a first swirling cavity. The second well section 23 is provided with a second swirl vane 231. The second well section 23, the second swirl vane 231 and the central tube 24 form a second swirling cavity. The pollution treatment section 22 is provided with a treatment cavity. The first swirling cavity, the treatment cavity and the second swirling cavity are connected in sequence to form a spiral flow channel. The pollution treatment section 22 is provided with an enhanced treatment module.

[0047] Reference Figure 4 , Figure 5 and Figure 6 As shown, specifically, the central shaft tube 24 serves to provide a connection base for the first rotary blade 211 and the second rotary blade 231. The inner well cover 25 is a sealing cover located on the top of the inner well 2. One end of the central shaft tube 24 passes through the inner well cover 25 to extend outward from the outer side of the inner well 2, providing an installation base for the pipeline. In some embodiments of the present invention, the central shaft tube 24 is made of stainless steel, and its diameter is adjusted according to the diameter of the inner well 2. The diameter of the central shaft tube 24 is not a limitation of the present invention, and is generally 80mm to 120mm.

[0048] It is understood that the inner well 2 includes a first well section 21, a contamination treatment section 22, and a second well section 23 arranged sequentially from top to bottom. The upper end of the contamination treatment section 22 is detachably connected to the lower end of the first well section 21, and the lower end of the contamination treatment section 22 is detachably connected to the upper end of the second well section 23. The contamination treatment section 22 is equipped with an enhanced treatment module. By quickly disassembling and replacing the contamination treatment section 22, multiple treatment technologies can be coupled. The contamination treatment section 22 can be replaced according to the actual conditions of different sites, different stages of the same site, and different areas of the same site, thereby realizing the replacement of the enhanced treatment module, improving flexibility, and shortening the repair cycle and improving repair efficiency by coupling multiple technical means.

[0049] It should be noted that the first well section 21 and the pollution treatment section 22, and the second well section 23 and the pollution treatment section 22 are detachably connected by a perforated flange. The perforated flange has multiple flow holes along the circumference to ensure the flow of groundwater.

[0050] It is understandable that a third rotary blade can be installed in the treatment chamber of the pollution treatment section 22 to accommodate the application of various enhanced treatment modules.

[0051] In some embodiments of the present invention, the chemical treatment module includes a microbial enhancement treatment module, a chemical oxidation module, or an electrochemical module.

[0052] Understandably, the inner well cover 25 is sealed at the top of the inner well 2. The inner circumference of the first swivel blade 211 is sealed to the upper end of the central shaft tube 24, the outer circumference of the first swivel blade 211 is sealed to the inner wall of the first well section 21, the inner circumference of the second swivel blade 231 is sealed to the lower end of the central shaft tube 24, and the outer circumference of the second swivel blade 231 is sealed to the inner wall of the second well section 23. This ensures that the spiral flow channel forms a single-direction channel, avoiding turbulent flow of groundwater in the spiral flow channel, which would reduce the hydraulic residence time and decrease the degradation effect on pollutants.

[0053] In some embodiments of the present invention, a pH detection device is provided in both the first swirling cavity and the second swirling cavity.

[0054] Specifically, a pH detection device is installed in the first and second swirl chambers to detect the pH value of the groundwater in the first and second swirl chambers respectively. By comparing the changes in the pH value of the groundwater in the first and second swirl chambers, the decomposition state of pollutants in the groundwater by the enhanced treatment module can be inferred, so as to adjust the flow rate of the agent and achieve precise operation.

[0055] Reference Figure 1 As shown, in some embodiments of the present invention, the outer wall of the inner well 2 and the inner wall of the outer well 1 are connected by a flexible connecting device 8.

[0056] Specifically, the outer wall of the inner well 2 is connected to the inner wall of the outer well 1 by a flexible connecting device 8, which fixes the inner well 2. The connection by the flexible connecting device 8 reduces the resistance of groundwater flow and ensures smooth circulation.

[0057] Understandably, flexible connections enable quick replacement and improve efficiency.

[0058] Reference Figure 2 As shown, in some embodiments of the present invention, the water injection assembly 3 includes a water injection pump 33, a first water injection pipe 31, and a second water injection pipe 32; the first water injection pipe 31 is inserted into the central shaft pipe 24, and one end is provided with a packer 11 to extend to communicate with the inner cavity of the lower screen section 13, and the other end is connected to the water inlet of the water injection pump 33; the upper end of the central shaft pipe 24 is provided with a through hole 241, one end of the second water injection pipe 32 is connected to the upper end of the spiral flow channel through the through hole 241, and the other end of the second water injection pipe 32 is connected to the water outlet of the water injection pump 33.

[0059] Specifically, the water injection component 3 connects the upper screen section 12 and the lower screen section 13. By adjusting the power and speed of the water injection pump 33, the flow rate of groundwater in the circulation well is adjusted so that the flow direction and velocity of groundwater match the distribution of the pollution plume, thereby improving the remediation efficiency.

[0060] Understandably, one end of the first water injection pipe 31 extends to be flush with the lower screen hole 131, and one end of the second water injection pipe 32 is located at the upper end of the inner well 2.

[0061] In some embodiments of the present invention, the first water injection pipe 31 and the second water injection pipe 32 are made of PPR (random copolymer polypropylene). PPR material has excellent high temperature resistance and corrosion resistance, and has a low coefficient of linear expansion, which can effectively avoid stress concentration and pipe deformation caused by thermal expansion and contraction. The first water injection pipe 31 and the second water injection pipe 32 made of PPR have high strength and are not prone to deposit accumulation, which can effectively increase service life and reduce costs.

[0062] Reference Figure 2 As shown, in some embodiments of the present invention, the groundwater circulation well repair system further includes a gas distribution assembly 4. The gas distribution assembly 4 includes a gas pump 43, a gas distribution pipe 41, and a gas distribution plate 42. The gas pump 43 is located on the ground. One end of the gas pump 43 is connected to one end of the gas distribution pipe 41. The other end of the gas distribution pipe 41 passes through the central shaft pipe 24 to extend to the bottom of the upper screen section 12. The other end of the gas distribution pipe 41 is connected to the gas distribution plate 42, which is located below the inner well 2.

[0063] Specifically, the air pump 43 delivers air to the air distribution plate 42 through the air distribution pipe 41. The air distribution plate 42 is located below the inner well 2. Groundwater enters the upper screen section 12 through the spiral flow channel. The air distribution plate 42 dissolves oxygen from the air into the groundwater, thereby increasing the oxygen content of the groundwater and improving the oxidation efficiency of metal pollutants in the groundwater. In addition, it can also promote the decomposition of organic pollutants in the groundwater and improve the purification efficiency.

[0064] Reference Figure 2 As shown, in some embodiments of the present invention, the groundwater circulation well repair system further includes an exhaust gas purification component 5. The exhaust gas purification component 5 includes an air pump 52, an exhaust gas collection pipe 51, and a purification treatment structure 53. An outer well cover 14 is provided on the top of the outer well 1. One end of the exhaust gas collection pipe 51 is connected to the air inlet of the air pump 52, and the other end of the exhaust gas collection pipe 51 passes through the outer well cover 14 to extend into the cavity of the upper screen section 12. The purification treatment structure 53 is connected to the air outlet of the air pump 52. The air pump 52 is adapted to transport the exhaust gas in the cavity of the upper screen section 12 to the purification treatment structure 53 for purification treatment through the exhaust gas collection pipe 51.

[0065] Specifically, the VOC gas generated from groundwater purification is purified by setting up the exhaust gas purification component 5. The exhaust pump 52 draws the VOC gas in the upper screen section 12 into the purification treatment structure 53 through the exhaust gas collection pipe 51. After decomposition treatment, the VOC gas avoids secondary pollution to the environment.

[0066] It is understandable that the inner well cover 25 is provided with a VOC gas guide pipe 26. One end of the VOC gas guide pipe 26 is connected to the spiral flow channel, and the other end of the VOC gas guide pipe 26 extends to the upper end of the upper screen section 12 and is set opposite to the tail gas collection pipe 51.

[0067] In some embodiments of the present invention, a gas-liquid separator 54 is provided between the purification structure 53 and the vacuum pump 52. One end of the gas-liquid separator 54 is connected to the outlet of the vacuum pump 52, and the other end is connected to the purification structure 53. The gas-liquid separator 54 is suitable for gas-liquid separation of VOC gas. The purification structure 53 includes a high-power ionization purifier and an activated carbon adsorption module. The high-power ionization purifier is connected to the gas-liquid separator 54. After gas-liquid separation, the VOC gas enters the high-power ionization purifier for decomposition. Subsequently, the activated carbon adsorption module can adsorb and purify the incompletely decomposed VOC gas, preventing VOC gas from polluting the external environment.

[0068] Reference Figure 2 As shown, in some embodiments of the present invention, the groundwater circulation well repair system further includes a repair reagent injection component 6, which includes a dosing pipe 61. One end of the dosing pipe 61 passes through the inner well cover 25 to extend to communicate with the upper end of the spiral flow channel, and the other end of the dosing pipe 61 is connected to a reagent bottle 62. A flow meter 63 and / or a flow rate regulating valve 64 are provided between the dosing pipe 61 and the reagent bottle 62.

[0069] Specifically, when the enhanced treatment module is a microbial treatment module or an electrochemical oxidation treatment module, nutrients or oxidizing agents need to be introduced into the circulation well. One end of the dosing pipe 61 flows through the upper end of the spiral channel. By setting the dosing pipe 61, nutrients or chemical agents are injected into the spiral channel. The nutrients or chemical agents descend with the groundwater vortex, thereby decomposing pollutants. A flow meter 63 and / or a flow rate regulating valve 64 are set between the dosing pipe 61 and the agent bottle 62 to adjust the flow rate, quality, and time of the nutrients or chemical agents according to the actual situation of groundwater pollutants, so as to achieve precise treatment and improve the decomposition efficiency of pollutants in groundwater.

[0070] It is understood that the position of the dosing tube 61 can be set according to the type of enhanced treatment module, and the position of the feeding tube is not a limitation of the present invention.

[0071] Reference Figure 2As shown, in some embodiments of the present invention, the groundwater circulation well repair system further includes a dredging component 7, which includes a sludge extraction pipe 71, a sludge collection box 72, and a sludge extraction pump 73. The sludge extraction pump 73 is located on the ground, the sludge collection box 72 is located below the spiral flow channel and is correspondingly arranged to the bottom opening of the spiral flow channel, one end of the sludge extraction pipe 71 is connected to the sludge collection box 72, the other end of the sludge extraction pipe 71 is connected to the inlet end of the sludge extraction pump 73, and the outlet end of the sludge extraction pump 73 is connected to the sludge tank 74.

[0072] Specifically, when the enhanced treatment module is a microbial module, organic pollutants accumulate to form sludge during the decomposition treatment of groundwater. A sludge collection box 72 is installed below the spiral flow channel. As the groundwater spirals downward, the sludge generated in the enhanced treatment module flows into the sludge collection box 72 along with the groundwater. The sludge extraction pump 73 draws the sludge from the sludge collection box 72 into the sludge pool 74 located on the ground through the sludge extraction pipe 71, thus preventing the sludge from accumulating in the circulation well and clogging the screen holes.

[0073] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A groundwater circulation well repair system, characterized in that, include: An outer well (1) is provided with a packer (11) inside the outer well (1). The packer (11) is adapted to divide the outer well (1) into an upper screen section (12) and a lower screen section (13). An upper screen hole (121) is opened on the top side wall of the upper screen section (12), and a lower screen hole (131) is opened on the side wall of the lower screen section (13). An inner well (2) is located inside the upper screen section (12). The top cover of the inner well (2) is sealed with an inner well cover (25). A spiral flow channel is formed inside the well cavity of the inner well (2). The bottom of the spiral flow channel is connected to the cavity of the upper screen section (12). A strengthening treatment module is provided in the spiral flow channel. The inner well (2) is provided with a central shaft tube (24). A water injection assembly (3) has one end inserted through the packer (11) to extend into the cavity of the lower screen section (13), and the other end inserted through the inner well cover (25) to extend and communicate with the upper end of the spiral flow channel. The water injection assembly (3) is adapted to connect the lower screen section (13) and the spiral flow channel. The water injection assembly (3) includes a water injection pump (33), a first water injection pipe (31), and a second water injection pipe (32). The first water injection pipe (31) is inserted through the packer (11) to extend into the cavity of the lower screen section (13). The central tube (24) is connected to the inner cavity of the lower screen section (13) by the packer (11) at one end and the other end is connected to the inlet of the injection pump (33). The upper end of the central tube (24) is provided with a through hole (241). One end of the second injection pipe (32) is connected to the upper end of the spiral channel through the through hole (241), and the other end of the second injection pipe (32) is connected to the outlet of the injection pump (33).

2. The groundwater circulation well repair system according to claim 1, characterized in that, One end of the central tube (24) passes through the inner well cover (25) to extend out of the inner well (2). The inner well (2) includes a first well section (21), a pollution treatment section (22), and a second well section (23) arranged sequentially from top to bottom. The upper end of the pollution treatment section (22) is detachably connected to the lower end of the first well section (21), and the lower end of the pollution treatment section (22) is detachably connected to the upper end of the second well section (23). The central tube (24) passes through the first well section (21), the pollution treatment section (22), and the second well section (23) in sequence. The well section (21) is provided with a first swirl vane (211), the first well section (21), the first swirl vane (211) and the central tube (24) form a first swirling cavity. The second well section (23) is provided with a second swirl vane (231), the second well section (23), the second swirl vane (231) and the central tube (24) form a second swirling cavity. The pollution treatment section (22) is provided with a treatment cavity. The first swirling cavity, the treatment cavity and the second swirling cavity are connected in sequence to form the spiral flow channel. The pollution treatment section (22) is provided with the enhanced treatment module.

3. The groundwater circulation well repair system according to claim 2, characterized in that, The enhanced treatment module includes a microbial enhanced treatment module, a chemical oxidation module, or an electrochemical module.

4. The groundwater circulation well repair system according to claim 3, characterized in that, Both the first swirling chamber and the second swirling chamber are equipped with pH value detection devices.

5. The groundwater circulation well repair system according to claim 2, characterized in that, The outer wall of the inner well (2) is connected to the inner wall of the outer well (1) by a flexible connecting device (8).

6. The groundwater circulation well repair system according to claim 2, characterized in that, It also includes a gas distribution assembly (4), which includes a gas pump (43), a gas distribution pipe (41) and a gas distribution plate (42). The gas pump (43) is located on the ground. One end of the gas pump (43) is connected to one end of the gas distribution pipe (41). The other end of the gas distribution pipe (41) passes through the central shaft pipe (24) to extend to the bottom of the upper screen section (12). The other end of the gas distribution pipe (41) is connected to the gas distribution plate (42). The gas distribution plate (42) is located below the inner well (2).

7. The groundwater circulation well repair system according to any one of claims 1 to 6, characterized in that, It also includes an exhaust gas purification component (5), which includes an air pump (52), an exhaust gas collection pipe (51), and a purification treatment structure (53). The top of the outer well (1) is provided with an outer well cover (14). One end of the exhaust gas collection pipe (51) is connected to the air inlet of the air pump (52), and the other end of the exhaust gas collection pipe (51) passes through the outer well cover (14) to extend into the cavity of the upper screen section (12). The purification treatment structure (53) is connected to the air outlet of the air pump (52). The air pump (52) is adapted to transport the exhaust gas in the cavity of the upper screen section (12) to the purification treatment structure (53) through the exhaust gas collection pipe (51) for purification treatment.

8. The groundwater circulation well repair system according to any one of claims 1 to 6, characterized in that, It also includes a repair reagent injection assembly (6), which includes a dosing tube (61), one end of which passes through the inner well cover (25) to extend to communicate with the upper end of the spiral flow channel, and the other end of which is connected to the reagent bottle (62). A flow meter (63) and / or a flow rate regulating valve (64) are provided between the dosing tube (61) and the reagent bottle (62).

9. The groundwater circulation well repair system according to any one of claims 1 to 6, characterized in that, It also includes a sludge removal component (7), which includes a sludge extraction pipe (71), a sludge collection box (72), and a sludge extraction pump (73). The sludge extraction pump (73) is located on the ground. The sludge collection box (72) is located below the spiral channel and is corresponding to the bottom opening of the spiral channel. One end of the sludge extraction pipe (71) is connected to the sludge collection box (72), and the other end of the sludge extraction pipe (71) is connected to the inlet end of the sludge extraction pump (73). The outlet end of the sludge extraction pump (73) is connected to the sludge tank (74).

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