CN113277577B - Underground water pollution in-situ circulating repair system based on bubble pulsation theory - Google Patents
Underground water pollution in-situ circulating repair system based on bubble pulsation theory Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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Abstract
The invention relates to an underground water pollution in-situ circulating repair system based on a bubble pulsation theory, and belongs to the technical field of underground water pollution control and repair. The upper and lower parts of the circulating well pipe are distributed with upper and lower sections of permeable sieve pores, a gas injection pipe is arranged in the circulating well pipe, and the bottom of the gas injection pipe is provided with a perforated aeration head; a plurality of layers of airflow clapboards are arranged in the circulating well pipe, water-permeable sieve holes are distributed on the upper parts of the airflow clapboards, and the airflow clapboards are uniformly arranged between the gas injection pipe and the circulating well pipe; and a tail gas recovery pipe and a medicament injection pipe are arranged in the circulating well pipe. The invention only uses a circulating well pipe without special design, does not need pumping and injecting gas or water to provide underground water circulating power, realizes the circulation of the underground water only through the action of bubble pulsation, and directly realizes tail gas collection by using the pressure in the well, thereby effectively realizing the rapid removal of underground water volatile and semi-volatile organic pollutants, simplifying the well structure and process flow, reducing the equipment maintenance probability and saving the repair cost.
Description
Technical Field
The invention relates to the technical field of underground water pollution site control and repair, in particular to an underground water pollution in-situ circulating repair system based on a bubble pulsation theory.
Background
In recent years, rapid development of economic construction and upgrading and optimization of industrial structures in China have led to relocation of a large number of heavily polluted plants of pesticide plants and chemical plants, and a large number of volatile and semi-volatile organic pollutants, such as benzene, nitrobenzene, toluene, chlorobenzene, tetrachloroethylene, and the like, remain in the left soil and underground water. Meanwhile, most of the polluted sites have large pollution depth, complex stratum structures and multiple organic pollutant types, and the periphery of the polluted sites is often close to towns, so that the peripheral environment and the human health are easily damaged. Therefore, the problem of pollution of the related underground water and soil organic matters needs to be solved urgently.
The existing remediation technologies for underground water organic pollution mainly comprise two types: in situ repair and ex situ repair. The ectopic remediation is generally only suitable for groundwater pollution with high pollutant concentration and small pollution range due to the characteristics of high cost, large engineering quantity and the like. The application of the in-situ remediation technologies such as chemical oxidation, underground water aeration and the like has obvious limitations. In recent years, the underground water gas-drive circulating well technology is more and more concerned by people because the underground water gas-drive circulating well technology can integrate related technologies such as aeration, gas-phase extraction and stripping, and the like, and the technology can save a large amount of auxiliary facilities, has small disturbance to the underground environment and has negligible secondary pollution problem, so that the application space of the technology in the field of domestic underground water restoration is further improved.
Most of the existing gas-driven circulating well technologies need to specially design the structure of the well, for example, a gas-water separation device is installed on the upper part of the circulating well, and gas injection and gas extraction must be carried out synchronously to provide power for driving underground water to circulate. In addition, the requirement of the starting condition required by circulation is high, construction technicians need to master certain technical knowledge, for example, the installation position of the gas-water separation device and the flow relation of gas injection and gas extraction must be mastered, otherwise, circulation cannot be easily carried out, or groundwater flowing out of the circulation well is difficult to flow back into the circulation well, the circulation effect is difficult to guarantee, and the risk of pollution plume range expansion exists. The complex well structure and the process flow greatly increase the equipment maintenance probability, improve the repair risk and cost, and limit the application and popularization of the technology in the repair of actual polluted sites.
Disclosure of Invention
The invention aims to provide an underground water pollution in-situ circulating repair system based on a bubble pulsation theory, which solves the problems in the prior art. The invention has the characteristics of simple system structure, energy conservation, simple use method and the like, and particularly only uses a circulating well pipe without special design, does not need pumping and injecting gas or water to provide power for underground water circulation, realizes the circulation of underground water only through the action of bubble pulsation, directly realizes tail gas collection by using the pressure in the well, and does not need a vacuum pump to pump, thereby effectively realizing the rapid removal of underground water volatilization and semi-volatility organic pollutants, simplifying the well structure and the process flow, reducing the equipment maintenance probability, saving the repair cost, and being beneficial to the application and popularization of the technology in the repair of actual polluted sites.
The above object of the present invention is achieved by the following technical solutions:
the underground water pollution in-situ circulating remediation system based on the bubble pulsation theory comprises a circulating well pipe 1, a gas injection pipe 6, a perforated aeration head 7, an airflow partition plate 8, a tail gas recovery pipe 9 and a medicament injection pipe 10, wherein upper-section water-permeable sieve pores 2 are distributed on the upper part of the circulating well pipe 1 and serve as water outlets, and the middle position of each water outlet is flush with the underground water level; lower sections of permeable sieve pores 3 are distributed on the lower part of the circulating well pipe 1 and are used as water inlets, and the water inlets are positioned at the bottom end of the circulating well pipe 1 and are arranged on the bottom layer of polluted underground water;
a gas injection pipe 6 is arranged in the circulating well pipe 1, and the bottom end of the gas injection pipe 6 extends into the position of the lower section water-permeable sieve pore 3 at the lower part of the circulating well pipe 1; the bottom of the gas injection pipe 6 is provided with a perforated aeration head 7; a plurality of layers of circular airflow clapboards 8 are arranged in the circulating well pipe 1, permeable sieve holes are distributed at the upper part of each airflow clapboard 8, the airflow clapboards 8 are uniformly arranged between the gas injection pipe 6 and the circulating well pipe 1, the top of each airflow clapboard is kept away from the upper opening of the circulating well pipe, and the bottom of each airflow clapboard extends into the position of the liquid level of underground water; a tail gas recovery pipe 9 is arranged in the circulating well pipe 1 and used for collecting volatile and semi-volatile organic pollutant gas carried in rising bubbles in underground water; the circulating well pipe 1 is internally provided with a medicament injection pipe 10, the conveying of the in-situ reaction zone repairing medicament is realized by utilizing the underground water circulating effect, and the bottom end of the medicament injection pipe 10 extends into the bottom position of the upper-section water-permeable sieve pore 2 of the circulating well pipe 1.
The diameter of the circulation well pipe 1 is at least 20 cm.
The diameter of the gas injection pipe 6 is 2-3 cm, and the perforated aeration head 7 at the bottom of the gas injection pipe is composed of a one-way gas valve 10 and quartz sand gas-sepiolite, so that the diameter of the outflow bubble is ensured to be larger than 2 mm.
The upper part of the circular airflow partition plate 8 is distributed with permeable sieve pores, and the lower part of the circular airflow partition plate 8 is a water-impermeable partition plate with the length of at least 50 cm; the distance between the two layers of airflow clapboards 8 is set to be 3-5 cm; the distance between the air flow baffle plate 8 and the upper edge of the circulation well pipe 1 is 5-10 cm.
The diameter of the medicament injection pipe 10 is 2-3 cm, the bottom of the medicament injection pipe is blocked, medicament injection holes are distributed upwards from the bottom, and the length of the pipe wall on which the medicament injection holes are distributed is 30-50% of that of the pipe wall on which the upper-section water-permeable sieve holes are distributed on the circulating well pipe 1.
The three drug injection pipes 10 are respectively installed inside the circulation well pipe 1 at equal angles.
The gas injection device further comprises an air compressor 15 for supplying gas to the gas injection pipe 6, a pressure stabilizing valve 16 and/or a flow sensor I17 and/or a pressure sensor I18 and a valve I19 are mounted on a pipeline between the air compressor 15 and the gas injection pipe 6, and the valve I19 and the flow sensor I17 and/or the pressure sensor I18 are connected to a remote central control system.
The device is characterized by further comprising a medicament injection unit, wherein the medicament injection unit comprises a medicament preparation box 11, a medicament injection pump 12 and a flow monitoring meter 13, the medicament preparation box 11 is arranged on the ground and connected with the medicament injection pipe 10, and the medicament injection pump 12, the flow monitoring meter 13 and a second valve 14 are installed on a pipeline between the medicament preparation box 11 and the medicament injection pipe 10; the second valve 14, the second medicament injection pump 12, the flow monitoring meter 13 and the stirrer in the second medicament preparation box 11 are all connected with a remote central control system.
The upper end of the tail gas recovery pipe 9 is connected with a second flow sensor 23 and a second pressure sensor 20, and the downstream of the second pressure sensor 20 is connected with a polluted gas reagent reaction box 21 and/or an activated carbon adsorption column 22 according to the pollutant concentration.
The outer side of the circulating well pipe 1 is coated with a stainless steel wire mesh corresponding to the positions of the upper and lower sections of permeable sieve pores 2 and 3, and is filled with a permeable filler 4, and the outer side of the circulating well pipe without the permeable sieve pores is coated with a non-permeable filler 5, so that the effects of both permeable and filtering are achieved.
Compared with the prior art, the invention has the beneficial effects that:
the underground water circulation device has the advantages that the concept is novel, the structure is simple, the operation is convenient, only one well pipe which does not need to be specially designed is used, gas or water is not pumped and injected to provide power for underground water circulation, the underground water circulation is realized only through the bubble pulsation effect, and the requirement on the starting condition required by the circulation is low; the tail gas collection is directly realized by using the pressure in the well, and a vacuum pump is not needed for pumping, so that the repair cost is saved; the underground water circulation effect and the medicament injection pipe are utilized to realize the delivery of the in-situ reaction zone repairing medicament. On one hand, the invention reduces the operation difficulty of construction technicians; on the other hand, the risk of enlarging the pollution plume range caused by the circulation failure of underground water is greatly reduced, and the circulation remediation effect is ensured. In addition, the system meets the dual-purpose functions of groundwater pollution remediation and medicament transmission, achieves the aim of synchronously removing volatile and semi-volatile organic pollutants, and provides technical support for further realizing large-scale engineering application. The practicability is strong.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a schematic structural diagram of an in-situ circulation remediation system for groundwater pollution based on a bubble pulsation theory, provided by the invention;
FIG. 2 is a schematic plan view of a well tubing of the present invention;
fig. 3 is a front view of the circular gas flow baffle of the present invention.
In the figure: 1. circulating a well pipe; 2. the upper section of the permeable sieve pore; 3. a lower section of permeable sieve mesh; 4. a water-permeable filler; 5. a non-water permeable filler; 6. a gas injection pipe; 7. a perforated aeration head; 8. an airflow baffle; 9. a tail gas recovery pipe; 10. a medicament injection tube; 11. a medicament blending box; 12. a medicament injection pump; 13. a flow monitoring meter; 14. a second valve; 15. an air compressor; 16. a pressure maintaining valve; 17. a first flow sensor; 18. a first pressure sensor; 19. a first valve; 20. a second pressure sensor; 21. a contaminated gas reagent reaction chamber; 22. an activated carbon adsorption column; 23. and a second flow sensor.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 3, the system for in-situ circulating remediation of groundwater pollution based on the bubble pulsation theory only uses one circulation well pipe, does not need pumping and injecting water, and realizes circulation of groundwater only through the action of bubble pulsation, thereby effectively realizing rapid removal of groundwater volatile and semi-volatile organic pollutants; meanwhile, tail gas collection is directly realized by using the pressure in the well, a vacuum pump is not needed for pumping, and the repair cost is saved. The device comprises a circulating well pipe 1, a gas injection pipe 6, a perforated aeration head 7, an airflow partition plate 8, a tail gas recovery pipe 9 and a medicament injection pipe 10, wherein upper-section water-permeable sieve pores 2 are distributed on the upper part of the circulating well pipe 1 and are used as water outlets, and the middle positions of the water outlets are flush with the underground water level; lower sections of permeable sieve pores 3 are distributed on the lower part of the circulating well pipe 1 and are used as water inlets, and the water inlets are positioned at the bottom end of the circulating well pipe 1 and are arranged on the bottom layer of polluted underground water.
A gas injection pipe 6 is arranged in the circulating well pipe 1, and the bottom end of the gas injection pipe 6 extends into the position of the lower section water-permeable sieve pore 3 at the lower part of the circulating well pipe 1; the bottom of the gas injection pipe 6 is provided with a perforated aeration head 7 to prevent groundwater from flowing back to the gas injection pipe 6 due to negative pressure; meanwhile, the diameter of the outflow bubbles is ensured to meet the condition for generating the bubble pulsation effect, and the bubble pulsation effect is enhanced by the number of the bubbles as much as possible.
A plurality of layers of circular airflow clapboards 8 are arranged in the circulating well pipe 1, and an easily-detachable plug connection mode is adopted for improving the height of the underground water level in the circulating well in the bubble pulsation effect process. The upper part of the airflow clapboard 8 is distributed with permeable sieve pores with a certain height, so that the lifted groundwater can participate in groundwater circulation through the sieve pores at the upper part of the airflow clapboard, and further the bubble pulsation effect is effectively enhanced. The airflow separation plate 8 is uniformly arranged between the gas injection pipe 6 and the circulating well pipe 1, and the top of the airflow separation plate keeps a certain distance from the upper opening of the circulating well pipe, so that airflow in the circulating well pipe is ensured to uniformly and quickly enter the tail gas recovery pipe; the bottom end of the baffle plate extends into the position of the underground water level, and the distance between the two layers of airflow baffle plates is not too large, so that the effect of improving the underground water level is ensured.
An exhaust gas recovery pipe 9 is installed in the circulation well pipe 1 and is used for collecting volatile and semi-volatile organic pollutant gas carried in bubbles rising in underground water.
The circulating well pipe 1 is internally provided with a medicament injection pipe 10, the conveying of the in-situ reaction zone repairing medicament is realized by utilizing the underground water circulating effect, and the bottom end of the medicament injection pipe 10 extends into the bottom position of the upper-section water-permeable sieve pore 2 of the circulating well pipe 1. The effect of circulating water at the water outlet can be better utilized by the agent, and the agent is uniformly distributed in the polluted area of underground water.
The diameter of the circulation well pipe 1 is at least 20 cm.
The diameter of the gas injection pipe 6 is 2-3 cm, and a perforated aeration head 7 at the bottom of the gas injection pipe is composed of a one-way gas valve 10 and a 10-mesh quartz sand gas sepiolite, so that the diameter of an outflow bubble is ensured to be larger than 2 mm.
The upper part of the circular airflow clapboard 8 is distributed with a water-permeable sieve pore, and the lower part of the circular airflow clapboard 8 is a water-impermeable clapboard with the length of at least 50 cm; the distance between the two layers of airflow clapboards 8 is set to be 3-5 cm; the distance between the air flow baffle 8 and the upper edge of the circulation well pipe 1 is 5 cm.
The diameter of the medicament injection pipe 10 is 2-3 cm, the bottom of the medicament injection pipe is blocked, medicament injection holes are distributed upwards from the bottom, and the length of the pipe wall on which the medicament injection holes are distributed is 30-50% of that of the pipe wall on which the upper-section water-permeable sieve holes are distributed on the circulating well pipe 1.
The three drug injection pipes 10 are respectively installed inside the circulation well pipe 1 at equal angles.
The gas injection device further comprises an air compressor 15 for supplying gas to the gas injection pipe 6, a pressure stabilizing valve 16 and/or a flow sensor I17 and/or a pressure sensor I18 and a valve I19 are mounted on a pipeline between the air compressor 15 and the gas injection pipe 6, and the valve I19 and the flow sensor 17 and/or the pressure sensor I18 are connected to a remote central control system.
The device is characterized by further comprising a medicament injection unit, wherein the medicament injection unit comprises a medicament preparation box 11, a medicament injection pump 12 and a flow monitoring meter 13, the medicament preparation box 11 is arranged on the ground and connected with the medicament injection pipe 10, and the medicament injection pump 12, the flow monitoring meter 13 and a second valve 14 are installed on a pipeline between the medicament preparation box 11 and the medicament injection pipe 10; the drug injection pump 12 can inject the drugs configured in the drug preparation box 11 into the drug injection pipe 10 at different speeds, and the second valve 14, the drug injection pump 12, the flow rate monitor 13 and the stirrer in the drug preparation box 11 are all connected with the remote central control system.
The upper end of the tail gas recovery pipe 9 is connected with a second flow sensor 23 and a second pressure sensor 20, and the downstream of the second pressure sensor 20 is connected with a polluted gas reagent reaction box 21 and/or an activated carbon adsorption column 22 according to the pollutant concentration.
The outer side of the circulating well pipe 1 is coated with a stainless steel wire mesh corresponding to the positions of the upper and lower sections of permeable sieve pores 2 and 3, and is filled with a permeable filler 4, and the outer side of the non-permeable circulating well pipe without the permeable sieve pores is filled with a non-permeable filler 5, so that the functions of both permeable and filtering are achieved. Related fillers are not needed in the circulating well pipe, so that the effect of bubble pulsation is prevented from being influenced.
Example (b):
referring to fig. 1, the system for in-situ circulating remediation of groundwater pollution based on the bubble pulsation theory mainly comprises a gas injection unit, a circulating well unit, a medicament injection unit, a tail gas treatment unit and a remote central control system.
(1) Gas injection unit
The gas injection unit comprises an air compressor 15, a pressure stabilizing valve 16, a first flow sensor 17, a first pressure sensor 18, a gas injection pipe 6, a perforated aeration head 7 and the like. The gas injection unit injects clean air into the circulation well unit mainly through the air compressor 15, thereby providing driving force for the circulation of the groundwater. When the air compressor 15 is used for delivering gas to the circulation well unit, parameters such as stability of air pressure, gas injection flow rate, size and quantity of outflow bubbles and the like need to be considered, and the parameters are important factors influencing whether underground water can form circulation. If the gas injection flow is small, the number of bubbles is small, and the bubble pulsation effect cannot be formed in the circulating well; if the gas injection flow is too large, the increase of the hydraulic radius is not obvious, and the repair cost is increased. The unit realizes stable and continuous injection of gas through the gas regulating valve, and provides guarantee for stable hydraulic radius formed by the underground water circulating well technology. The monitoring device formed by the first flow sensor 17 and/or the first pressure sensor 18 is connected to a remote central control system (not shown), and adjusts the operation parameters such as the gas injection flow rate and the pressure of the air compressor 15 according to the detection signal.
(2) Circulation well unit
The circulating well unit mainly comprises a circulating well pipe 1, wherein the circulating well pipe 1 is generally made of stainless steel pipes, and the diameter of the circulating well pipe is not less than 20 cm. An upper section of permeable sieve pores 2 distributed on the upper part of the circulating well pipe 1 are water outlets, the middle position of the upper section of permeable sieve pores is flush with the underground water level, and a lower section of permeable sieve pores 3 on the lower part of the circulating well pipe 1 are water inlets, are positioned at the bottom end of the circulating well pipe and are positioned at the bottom layer of the polluted underground water; the length of the lower section of the permeable sieve pore 3 is 10 to 15 percent of the length of the circulating well pipe generally, and the length of the upper section of the permeable sieve pore 2 is 1.5 times of the length of the lower section of the permeable sieve pore 3 generally. Stainless steel wire meshes are arranged at the positions of the upper and lower sections of the water permeable sieve pores 2 and 3 corresponding to the outer side of the circulating well pipe 1, and gravel river sand and/or quartz sand media with proper grain size grading are refilled to prevent fine grains from blocking the sieve pores; other positions without sieve holes are filled with clay or/and concrete medium with small particle size, and the function of fixing the circulating well pipe 1 is achieved.
A circular airflow partition plate 8 is arranged at the upper part in the circulating well pipe 1, and the circular airflow partition plate is connected in an easily-detachable plug-in connection mode and used for improving the height of the underground water level in the circulating well in the bubble pulsation effect process; which is uniformly arranged between the gas injection pipe 6 and the circulation well pipe 1; the upper part of the airflow baffle plate is provided with a water-permeable sieve pore with a certain height, so that the lifted underground water can participate in the circulation of the underground water through the sieve pore at the upper part of the airflow baffle plate, and the bubble pulsation effect is effectively enhanced; the top of the circulating well pipe keeps a certain distance with the upper opening of the circulating well pipe 1, so that the air flow in the circulating well pipe 1 uniformly and quickly enters the tail gas recovery pipe 9, and the bottom end of the circulating well pipe extends into the bottom of the upper-section water-permeable sieve pore 2 of the circulating well pipe; the distance between the airflow clapboards 8 is not suitable to be too large so as to improve the height of the underground water level in the circulating well in the bubble pulsation effect process and strengthen the underground water circulation effect.
A gas injection pipe 6 is arranged in the circulating well pipe 1, the bottom end of the gas injection pipe 6 extends into the position of the lower section water-permeable sieve pore 3 of the circulating well pipe 1, and a perforated aeration head 7 is arranged to prevent the groundwater from flowing back to the gas injection pipe 6 due to negative pressure; meanwhile, the device is used for continuously and stably injecting clean air into the bottom of the inner well, so that the bubbles flowing out of the bottom of the circulating well pipe 1 are guaranteed to have certain size and quantity, and a bubble pulsation effect is formed in the circulating well pipe 1.
And a tail gas recovery pipe 9 is arranged in the circulating well pipe 1 and is used for collecting gas carrying VOCs in the circulating well pipe 1 for subsequent treatment, so that the vertical flow of underground water due to the aeration in the well is realized, and the transverse diffusion and the secondary pollution of pollutants are reduced.
A medicament injection pipe 10 is installed in the circulating well pipe 1, and the bottom end of the medicament injection pipe 10 extends into the bottom position of the upper-section permeable sieve pore 2. In a preferred embodiment, as shown in fig. 2, the three agent injection pipes 10 are arranged at equal angles inside the circulation well pipe 1, and each agent injection pipe 10 is provided with a hole which is opened upwards from the bottom and has a length of 30% -50% of the length of the upper section of the water permeable sieve pore 2, so that the agent can be uniformly distributed in the polluted area of the groundwater by better utilizing the action of the circulating water at the water outlet.
(3) Drug infusion unit
The drug injection unit mainly includes a drug preparation tank 11, a drug injection pump 12, a flow rate monitor, and the like. The agent injection pump 12 is used for communicating the agent which is prepared in the agent preparation box 11 to the agent injection pipe 10 through the flow monitor 13 and the valve II 14, and injecting the polluted underground water for reinforced repair. The stirrer, the medicament injection pump 12 and the flow monitoring meter 13 in the medicament preparing box 11 are all connected with a remote central control system, so that the integration of equipment and remote control are realized.
(4) Tail gas treatment unit
The tail gas treatment unit mainly comprises a polluted gas reagent reaction box 21, an active carbon adsorption column 22 and the like. The gas carrying the pollutants in the circulating well pipe 1 passes through the polluted gas reagent reaction box 21 to carry out oxidation-reduction reaction, the reaction reagent is selected according to the type of the pollutants, and then the gas is further processed by an active carbon adsorption column. The monitoring device flow sensor, the pressure sensor and the gas VOCs online detector in the unit are all connected with a remote central control system, and the integration of monitoring and control of equipment is realized.
(5) Remote central control system
The remote central control system utilizes the PLC equipment and the GPRS module to remotely control the on-off and parameter adjustment of the air compressor 15, the medicament injection pump 12 and other equipment. The field monitoring data all adopt simple convenient wireless transmission mode, increase wireless module on current PLC equipment basis, build wireless teletransmission platform. And connecting each sensor and monitoring device on site with the PLC device, monitoring data in real time, and displaying and recording configuration software on an indoor upper computer in real time. The operation of the circulating system is convenient for operators to find out abnormal operation, and the maintenance is carried out in time.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a groundwater pollution normal position circulation repair system based on bubble pulsation theory which characterized in that: the device comprises a circulating well pipe (1), a gas injection pipe (6), a perforated aeration head (7), an airflow partition plate (8), a tail gas recovery pipe (9) and a medicament injection pipe (10), wherein upper-section water-permeable sieve pores (2) are distributed on the upper part of the circulating well pipe (1) and are used as water outlets, and the middle positions of the water outlets are flush with the underground water level; lower sections of permeable sieve pores (3) are distributed on the lower part of the circulating well pipe (1) and are used as water inlets, and the water inlets are positioned at the bottom end of the circulating well pipe (1) and are arranged on the bottom layer of polluted underground water;
a gas injection pipe (6) is arranged in the circulating well pipe (1), and the bottom end of the gas injection pipe (6) extends into the position of the lower section water-permeable sieve pore (3) at the lower part of the circulating well pipe (1); the bottom of the gas injection pipe (6) is provided with a perforated aeration head (7); a plurality of layers of circular airflow clapboards (8) are arranged in the circulating well pipe (1) to realize the circulation of the underground water; the upper part of the airflow clapboard (8) is distributed with a permeable sieve pore, and the lower part of the airflow clapboard (8) is at least 50cm long and is a water-impermeable clapboard; the distance between the two layers of airflow clapboards (8) is set to be 3-5 cm; the airflow separation plates (8) are uniformly arranged between the gas injection pipe (6) and the circulating well pipe (1), and the distance between the two layers of airflow separation plates (8) is set to be 3-5 cm; the distance between the top of the airflow clapboard (8) and the upper edge of the circulating well pipe (1) is set to be 5-10 cm, and the bottom end of the airflow clapboard extends into the position of the underground water liquid level; a tail gas recovery pipe (9) is arranged in the circulating well pipe (1) and used for collecting volatile and semi-volatile organic pollutant gas carried in rising bubbles in underground water; the medicament injection pipe (10) is installed in the circulating well pipe (1), the conveying of the in-situ reaction zone repairing medicament is realized by utilizing the underground water circulating effect, and the bottom end of the medicament injection pipe (10) extends into the bottom position of the upper-section water-permeable sieve pore (2) of the circulating well pipe (1).
2. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the diameter of the circulation well pipe (1) is at least 20 cm.
3. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the diameter of the gas injection pipe (6) is 2-3 cm, and the perforated aeration head (7) at the bottom of the gas injection pipe consists of a one-way gas valve and quartz sand gas sepiolite, so that the diameter of the outflow bubble is ensured to be larger than 2 mm.
4. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the diameter of the medicament injection pipe (10) is 2-3 cm, the bottom of the medicament injection pipe is blocked, medicament injection holes are distributed upwards from the bottom, and the length of the pipe wall on which the medicament injection holes are distributed is 30-50% of the length of the pipe wall on which the upper-section water-permeable sieve holes are distributed on the circulating well pipe (1).
5. A groundwater pollution in-situ circulation remediation system based on a bubble pulsation theory according to claim 1 or 4, wherein: the three medicament injection pipes (10) are respectively arranged on the inner side of the circulating well pipe (1) at equal angles.
6. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the gas injection device is characterized by further comprising an air compressor (15) for supplying gas to the gas injection pipe (6), a pressure stabilizing valve (16) and/or a first flow sensor (17) and/or a first pressure sensor (18) and a first valve (19) are mounted on a pipeline between the air compressor (15) and the gas injection pipe (6), and the first valve (19) and the first flow sensor (17) and/or the first pressure sensor (18) are connected to a remote central control system.
7. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the device is characterized by further comprising a medicament injection unit, wherein the medicament injection unit comprises a medicament preparation box (11), a medicament injection pump (12) and a flow monitoring meter (13), the medicament preparation box (11) is arranged on the ground and is connected with the medicament injection pipe (10), and the medicament injection pump (12), the flow monitoring meter (13) and a second valve (14) are installed on a pipeline between the medicament preparation box (11) and the medicament injection pipe (10); the medicines configured in the medicine preparation box (11) of the medicine injection pump (12) are injected into the medicine injection pipe (10) at different speeds, and the second valve (14), the medicine injection pump (12), the flow monitoring meter (13) and the stirrer in the medicine preparation box (11) are connected with the remote central control system.
8. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the upper end of the tail gas recovery pipe (9) is connected with a second flow sensor (23) and a second pressure sensor (20), and the downstream of the second pressure sensor (20) is connected with a polluted gas reagent reaction box (21) and/or an activated carbon adsorption column (22) according to the pollutant concentration.
9. The underground water pollution in-situ circulation remediation system based on the bubble pulsation theory as claimed in claim 1, wherein: the outer side of the circulating well pipe (1) is coated with a stainless steel wire mesh corresponding to the positions of the upper and lower sections of permeable sieve pores (2 and 3), and is refilled with a permeable filler (4), and the outer side of the circulating well pipe which is not provided with the permeable sieve pores is coated with a non-permeable filler (5), so that the effects of permeating water and filtering are achieved.
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| CN114940527B (en) | 2022-02-28 | 2023-04-18 | 成都理工大学 | Pressure-adjustable hydrodynamic cavitation underground water circulating well system |
| CN115784487A (en) * | 2022-10-17 | 2023-03-14 | 生态环境部南京环境科学研究所 | Remediation device and remediation method for remediation of groundwater benzene series pollution |
| CN115724498B (en) * | 2022-11-25 | 2024-03-19 | 吉林大学 | Underground pollution restoration device and method |
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| US6787038B2 (en) * | 2002-02-05 | 2004-09-07 | Cerestar Holding B.V. | Extraction of pollutants from underground water |
| JP2018079416A (en) * | 2016-11-15 | 2018-05-24 | 鹿島建設株式会社 | System and method for purifying ground water |
| CN206955867U (en) * | 2017-06-21 | 2018-02-02 | 上海环钻环保科技股份有限公司 | A kind of circulation well device for organic contamination underground water in-situ immobilization |
| CN109650571A (en) * | 2018-12-27 | 2019-04-19 | 博川环境修复（北京）有限公司 | A kind of circulation well |
| CN111646577A (en) * | 2020-05-18 | 2020-09-11 | 中科鼎实环境工程有限公司 | Circulating well system for treating VOCs and DNAPLs in polluted underground water |
| CN112645542A (en) * | 2020-12-29 | 2021-04-13 | 苏州精英环保有限公司 | Circulating well system for in-situ remediation of organic polluted underground water |
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