CN111484122A - Underground water remediation system and method - Google Patents
Underground water remediation system and method Download PDFInfo
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- CN111484122A CN111484122A CN202010323131.9A CN202010323131A CN111484122A CN 111484122 A CN111484122 A CN 111484122A CN 202010323131 A CN202010323131 A CN 202010323131A CN 111484122 A CN111484122 A CN 111484122A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The embodiment of the application discloses a groundwater remediation system and a remediation method, which are used for ensuring the continuity of groundwater remediation effects. The utility model provides a groundwater repair system, the circulating well includes the inner well screen pipe, outer well screen pipe and well lid, the outer matching cover of inner well screen pipe is equipped with middle screen pipe, middle screen pipe can rotate relative inner well screen pipe, middle screen pipe includes first screen pipe section and second screen pipe section, aeration system's aeration pipe extends to and is connected with the aeration head in the inner well screen pipe, when middle screen pipe rotates to the first position, the sieve mesh on the first screen pipe section is aimed at the sieve mesh on the inner well screen pipe rather than corresponding, sieve mesh on the second screen pipe section staggers rather than the sieve mesh on the corresponding inner well screen pipe, thereby seal the sieve mesh on the corresponding inner well screen pipe, when middle screen pipe rotates to the second position, sieve mesh on the second screen pipe section is aimed at the sieve mesh on the inner well screen pipe rather than corresponding, the aeration head sets up between second screen pipe section and circulating well bottom.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution remediation, and particularly relates to a groundwater remediation system and a remediation method.
Background
The main sources of organic pollution of underground water include the use of pesticides and fertilizers, oil leakage and the random arrangement and discharge of organic wastes by factory enterprises. Wherein the main component causing the petroleum pollution of the soil is C15-C36The compound can be alkane, olefin, benzene series, polycyclic aromatic hydrocarbon, phenols and the like, wherein the environment has limited control on pollutants of up to 30 types. Pollutants in surface soil in the polluted site penetrate the aeration zone to enter the diving aquifer mainly in a vertical migration mode. Therefore, the pollution of diving is inseparable with the pollution of surface soil, the groundwater aquifer ground soil, and the pollutant gets into behind the surface soil, under the rainwater eluviation effect, along with the time lapse, must can be gradually downward vertical migration, causes the pollution of diving.
At present, for organic pollutants, the oxygen is added to underground water through biological oxidation to promote in-situ biodegradation so as to achieve the aim of repairing the underground water, which is the most common underground water repairing idea at present. Although oxygen is the most abundant electron donor in nature and is also the most readily available electron donor for microorganisms, it is not easy to add oxygen to groundwater. Due to factors such as low oxygen solubility and difficult underground mass transfer, the cost of underground water restoration projects which take oxygen enrichment as a main means is difficult to greatly reduce, so the application is limited.
The mass transfer mechanism of the underground water circulating well technology mainly comprises volatilization of organic matters between gas and water phases, adsorption/desorption of the organic matters on a medium and dissolution of the organic matters, and the migration process is mainly influenced by the effects of convection dispersion, molecular diffusion and the like. Meanwhile, the aeration process improves the content of dissolved oxygen in the underground water, strengthens in-situ aerobic biodegradation, and determines the removal of organic matters through multiple actions. The volatilization process of the organic matter entering the gas phase from the water phase is actually the process of the organic matter transferring between the gas phase and the water phase, and the transfer rate is influenced by various effects such as temperature, total pressure of gas in a system, concentration of the water phase of the organic matter and the like. The technology has the advantages of simple structure, convenient operation and maintenance, small disturbance to the site environment and the like. However, once the circulating well repairing system stops operating, the bound non-aqueous phase liquid can be continuously discharged into the water body as a persistent pollution source, and the water body can be polluted again.
In conclusion, the existing groundwater remediation technology has the problem of poor remediation effect persistence.
Disclosure of Invention
The technical problem to be solved by the embodiment of the application is to provide a groundwater remediation system and a remediation method capable of ensuring the continuity of groundwater remediation effects.
To this end, an aspect of the present invention provides an underground water remediation system, including a circulation well and an aeration system, where the circulation well includes an inner well screen, an outer well screen, and a sealing well lid covering the top of the outer well screen;
a middle screen pipe is sleeved outside the inner well screen pipe in a matching manner, and the middle screen pipe can rotate between a first position and a second position relative to the inner well screen pipe;
the middle sieve tube comprises a first sieve tube section positioned above the underground water level and a second sieve tube section positioned below the underground water level, and an aeration tube of the aeration system penetrates through the sealing well cover and extends into the inner well sieve tube to be connected with an aeration head;
when the middle screen pipe rotates to the first position, the screen holes on the first screen pipe section are aligned with the screen holes on the inner well screen pipe corresponding to the first screen pipe section, and the screen holes on the second screen pipe section are staggered with the screen holes on the inner well screen pipe corresponding to the second screen pipe section, so that the screen holes on the corresponding inner well screen pipe are closed;
when the middle screen pipe rotates to the second position, the screen holes on the second screen pipe section are aligned with the corresponding screen holes on the inner well screen pipe;
the aeration head is arranged between the second screen section and the bottom of the circulating well, and an exhaust pipe is arranged on the sealed well cover.
In some embodiments, the screen holes on the inner well screen are arranged in rows along a circumferential direction of a cross section of the inner well screen, each row comprising a plurality of the screen holes equidistantly spaced along an axial direction of the inner well screen;
the sieve pores on the middle sieve tube are divided into a first sieve pore and a second sieve pore;
the first sieve holes are equal to the sieve holes on the inner well sieve tube in number and correspond to the sieve holes on the inner well sieve tube in position one to one;
the second sieve holes are arranged on the first sieve tube section and are alternately arranged with the first sieve holes in rows on the middle sieve tube along the circumferential direction of the cross section of the middle sieve tube;
when the middle screen pipe rotates to a first position, the second screen holes are aligned with the screen holes on the inner well screen pipe, and the first screen holes are staggered with the screen holes on the inner well screen pipe;
when the middle screen pipe rotates to the second position, the first screen holes are aligned with the screen holes on the inner well screen pipe.
In some embodiments, the aeration system further comprises an air storage tank and an air pump which are arranged on the ground, and the air storage tank, the air pump and the aeration pipe are connected in sequence.
In some embodiments, the exhaust pipe is connected to a vacuum pump and an activated carbon adsorption tank on the ground in sequence.
In some embodiments, the exhaust pipe and the aeration pipe are provided with control valves.
In some embodiments, a first annular stop ring is disposed on an outer wall of the inner well screen, and a bottom end of the middle screen seals against the first annular stop ring.
In some embodiments, a second annular baffle ring is disposed in the inner well screen above the ground water level, and a sealing end cover is disposed on the aerator pipe and is in sealing interference with the second annular baffle ring.
An underground water remediation system using the underground water remediation system comprises the following steps:
rotating the middle sieve tube to a first position;
aerating to the inner well sieve tube through an aeration tube of the aeration system, injecting ozone and/or oxygen into the bottom end of the inner well sieve tube, mixing with the underground water to form a gas-water mixture with low density, and promoting the underground water at the bottom end of the circulating well to continuously flow into the well due to density difference formed inside and outside the circulating well; meanwhile, the gas-water mixture of the screen pipe of the inner well continuously rises, the gas carrying the organic matters is discharged from the well through the exhaust pipe, the underground water is reversely infiltrated back to the aquifer through the first screen pipe section, and an underground water three-dimensional circulating flow field is formed around the circulating well through continuous aeration;
after a certain amount of underground water containing organic pollutants is treated, the middle sieve tube is rotated to a second position, the aeration tube is taken out at the same time, and reaction fillers are added into the inner well sieve tube to form an injection type permeable reaction wall, so that the continuous effect of repairing the underground water is ensured.
In some embodiments, the reactive filler employs modified zero valent iron or clay minerals.
Compared with the prior art, at least one embodiment of the application has the following beneficial effects:
1. by injecting liquid oxygen or ozone into the underground water, the underground water presents an oxidation environment, the underground water polluted by organic matters can be effectively repaired, a three-dimensional circulating flow field of the underground water can be formed around the circulating well due to density difference formed in the circulating well, and the organic matters pollutants can be subjected to reactions such as volatilization between gas and water, adsorption/desorption on a medium, dissolution of the organic matters and the like. After reacting for a period of time, the circulating well can be changed into an injection type permeable reaction wall reaction system, and active reaction medium is injected into the circulating well to form a banded reaction area, so that the underground water treatment effect is continuously and stably ensured.
2. The whole underground water remediation system is simple in structure and convenient to operate and maintain; the disturbance to the field environment is small; underground water is not pumped to the ground surface, a large amount of auxiliary facilities are saved, and the cost is greatly reduced; meanwhile, the modified injection type permeable reaction wall has strong adaptability to water quality, high stability, continuous operation, good treated water quality and economy.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a screen of a groundwater remediation system according to an embodiment of the present invention in a first position;
FIG. 2 is a schematic structural diagram of a middle screen of the groundwater remediation system provided by an embodiment of the invention in a second position;
FIG. 3 is a schematic view of a middle screen construction provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of an inner well screen configuration provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the groundwater remediation system provided by the embodiment of the application comprises a circulation well and an aeration system, wherein the circulation well comprises an inner well sieve tube 1, an outer well sieve tube 2 and a sealing well cover 3 covering the top of the outer well sieve tube 2, water permeable sieve holes (not shown in the figure) are uniformly distributed on the inner well sieve tube 1 and the outer well sieve tube 2, and groundwater can freely pass through the water permeable sieve holes. The outer of the inner well screen pipe 1 is also sleeved with a middle screen pipe 4 in a matching manner, a water passing gap is reserved between the middle screen pipe 4 and the outer well screen pipe 2, and the middle screen pipe 4 can rotate between a first position and a second position relative to the inner well screen pipe 1.
Specifically, the middle sieve tube 4 comprises a first sieve tube section 401 located above the ground water level 5 and a second sieve tube section 402 located below the ground water level 5, an aeration pipe 6 of the aeration system penetrates through the sealed well cover 3 and extends into the inner well sieve tube 1 to be connected with an aeration head 7, when the middle sieve tube 4 rotates to a first position, sieve holes on the first sieve tube section 401 are aligned with sieve holes on the inner well sieve tube 1 corresponding to the sieve holes, sieve holes on the second sieve tube section 402 are staggered with sieve holes on the inner well sieve tube 1 corresponding to the sieve holes, so that the sieve holes on the inner well sieve tube 1 corresponding to the sieve tubes are sealed, when the middle sieve tube 4 rotates to a second position, the sieve holes on the second sieve tube section 402 are aligned with sieve holes on the inner well sieve tube 1 corresponding to the sieve tubes, the aeration head 7 is arranged between the second sieve tube 402 and the bottom of the circulating well, and an exhaust pipe 8 is arranged on.
The underground water remediation system is simple in structure, convenient to operate and maintain, small in disturbance to the field environment, free of pumping of underground water to the ground surface, free of a large number of auxiliary facilities and greatly reduced in cost; meanwhile, the modified injection type permeable reaction wall has strong adaptability to water quality, high stability, continuous operation, good treated water quality and economy.
Referring to fig. 3 and 4, in some possible embodiments, the sieve holes 101 on the inner well screen 1 are arranged in rows along the circumferential direction of the cross section of the inner well screen, each row includes a plurality of sieve holes equidistantly spaced along the axial direction of the inner well screen 1, and the sieve holes on the middle screen 4 are divided into a first sieve hole 403 and a second sieve hole 403, wherein the first sieve hole 403 is equal in number and corresponds to the sieve holes 101 on the inner well screen 1 in one-to-one correspondence, and the second sieve hole 403 is arranged on the first sieve tube section 401 and is alternately arranged in rows along the circumferential direction of the cross section of the middle screen with the first sieve hole 403. When the middle screen 4 is rotated to the first position, the second screen holes 404 are aligned with the screen holes on the inner well screen 1, the first screen holes 403 are staggered with the screen holes on the inner well screen 1, and when the middle screen 4 is rotated to the second position, the first screen holes 403 are aligned with the screen holes 101 on the inner well screen 1.
In the embodiment of the application, the middle screen pipe 4 is rotated to the first position, the second screen holes are aligned with the screen holes on the inner well screen pipe, the first screen holes are staggered with the screen holes on the inner well screen pipe by a set distance, the middle part of the inner well screen pipe is sealed, so that underground water at the bottom of the well can only overflow from the top of the inner well screen pipe and enter the soil again, a three-dimensional underground water circulating flow field is formed around the circulating well, after the circulating well is treated for a period of time, the middle screen pipe 4 is rotated to the second position, the first screen holes on the second screen pipe section 402 are aligned with the corresponding screen holes on the inner well screen pipe 1, so that the inner well screen pipe 1 and the outer well screen pipe 2 are communicated with each other below the underground water level, the circulating well can be changed into an injection type permeable reaction wall reaction system, reaction fillers 18 are injected into the circulating well to form a strip-shaped reaction area, simple structure, the operation is convenient, can be fast repack the circulation well into injection type permeability reaction wall reaction system, even if the ground water level changes moreover, can not destroy injection type permeability reaction wall structure yet.
Referring to fig. 1 and 2, in some possible embodiments, the aeration system further includes an air tank 9 and an air pump 10 disposed on the ground, and the air tank 9, the air pump 10 and the aeration pipe 6 are connected in sequence.
In the embodiment of the application, the middle sieve tube 4 is rotated to the first position, oxygen or ozone in the gas storage tank 9 is pumped into the inner well sieve tube 1 through the aeration tube 6 by the gas pump 10 to enable the underground water to present an oxidation environment, the underground water polluted by organic matters can be effectively repaired, density difference formed in the circulating well can enable a three-dimensional circulating flow field of the underground water to be formed around the circulating well, and the organic matters can be subjected to reactions such as gas-water two-phase volatilization, medium adsorption/desorption, organic matter dissolution and the like. After a period of reaction, the middle sieve tube 4 is rotated to the second position, the sieve holes on the second sieve tube section 402 are aligned with the corresponding sieve holes on the inner well sieve tube 1, so that the inner well sieve tube 1 and the outer well sieve tube 2 are communicated at all positions below the underground water level, the circulating well can be modified into an injection type permeable reaction wall reaction system, reaction fillers 18 are injected into the circulating well to form a strip-shaped reaction area, and the underground water treatment effect is continuously and stably ensured. Wherein, the reaction filler is selected according to the nature of pollutants, and can be used as modified zero-valent iron, clay minerals and the like of the reaction filler.
Referring to fig. 1, in some possible embodiments, the exhaust pipe 8 is connected to a vacuum pump 11 and an activated carbon adsorption tank 12 on the ground in turn, and the aeration pipe 6 is provided with a first control valve 13 and the exhaust pipe 8 is provided with a second control valve 14. The activated carbon adsorption tank 12 is used for treating volatile organic pollutants and is conveyed by the vacuum pump 11.
Referring to fig. 1, in some possible embodiments, a first annular retainer 15 is provided on the outer wall of the inner well screen 1, and the bottom end of the middle screen 4 seals against the first annular retainer 15. A second annular baffle ring 16 is arranged on the underground water level 5 in the inner well screen pipe 1, a sealing end cover 17 which is in sealing contact with the second annular baffle ring 16 is arranged on the aeration pipe 6, and the aeration pressure can be effectively increased by arranging the sealing end cover 17 in the inner well screen pipe 1. Specifically, the aeration pipe 6 is adhered to the end cap 17 and fixed to the second annular baffle ring 16.
Referring to fig. 1 to 4, an underground water remediation system using the above-described underground water remediation system includes the steps of:
rotating the middle screen pipe 4 to a first position, aligning the screen holes on the first screen pipe section 401 with the screen holes on the inner well screen pipe 1 corresponding to the first screen pipe section, and staggering the screen holes on the second screen pipe section 402 with the screen holes on the inner well screen pipe 1 corresponding to the second screen pipe section so as to seal the screen holes on the corresponding inner well screen pipe 1;
aerating the inner well sieve tube 1 through an aeration tube 6 of an aeration system, injecting ozone or oxygen into the bottom end of the inner well sieve tube 1, mixing with underground water to form a gas-water mixture with low density, and promoting the underground water at the bottom end of the circulating well to continuously flow into the well due to density difference formed inside and outside the circulating well; meanwhile, the gas-water mixture of the screen pipe 1 of the inner well continuously rises, the gas carrying organic matters is discharged from the well through the exhaust pipe 8, the underground water is reversely infiltrated back to the aquifer through the first screen pipe section 401, and an underground water three-dimensional circulating flow field is formed around the circulating well through continuous aeration;
after a certain amount of groundwater containing organic pollutants is treated, the middle sieve tube 4 is rotated to a second position, the sieve holes on the second sieve tube section 402 are aligned with the corresponding sieve holes on the inner well sieve tube 1, so that the inner well sieve tube 1 and the outer well sieve tube 2 are communicated everywhere below the groundwater level, the aeration tube 6 is taken out, and reaction fillers are added into the inner well sieve tube 1 to form an injection type permeable reaction wall, thereby ensuring the continuous effect of groundwater remediation.
Aiming at the characteristics that organic pollution is complex and difficult to restore, liquid oxygen and/or ozone are injected into underground water, so that the underground water presents an oxidation environment, the underground water polluted by the organic matters can be effectively restored, the density difference formed in the circulating well can form an underground water three-dimensional circulating flow field around the circulating well, and the organic pollutants can be subjected to reactions such as volatilization between gas and water, adsorption/desorption on a medium, dissolution of the organic matters and the like. After a period of reaction, the circulating well can be changed into an injection type permeable reaction wall reaction system, and reaction fillers 18 are injected into the circulating well to form a banded reaction area, so that the underground water treatment effect is continuously and stably ensured.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (9)
1. Groundwater repair system, including circulation well and aeration system, its characterized in that: the circulating well comprises an inner well screen pipe, an outer well screen pipe and a sealing well cover covering the top of the outer well screen pipe;
a middle screen pipe is sleeved outside the inner well screen pipe in a matching manner, and the middle screen pipe can rotate between a first position and a second position relative to the inner well screen pipe;
the middle sieve tube comprises a first sieve tube section positioned above the underground water level and a second sieve tube section positioned below the underground water level, and an aeration tube of the aeration system penetrates through the sealing well cover and extends into the inner well sieve tube to be connected with an aeration head;
when the middle screen pipe rotates to the first position, the screen holes on the first screen pipe section are aligned with the screen holes on the inner well screen pipe corresponding to the first screen pipe section, and the screen holes on the second screen pipe section are staggered with the screen holes on the inner well screen pipe corresponding to the second screen pipe section, so that the screen holes on the corresponding inner well screen pipe are closed;
when the middle screen pipe rotates to the second position, the screen holes on the second screen pipe section are aligned with the corresponding screen holes on the inner well screen pipe;
the aeration head is arranged between the second screen section and the bottom of the circulating well, and an exhaust pipe is arranged on the sealed well cover.
2. A groundwater remediation system as claimed in claim 1, wherein: the sieve pores on the inner well sieve tube are arranged in rows along the circumferential direction of the cross section of the inner well sieve tube, and each row comprises a plurality of sieve pores which are equidistantly distributed along the axial direction of the inner well sieve tube at intervals;
the sieve pores on the middle sieve tube are divided into a first sieve pore and a second sieve pore;
the first sieve holes are equal to the sieve holes on the inner well sieve tube in number and correspond to the sieve holes on the inner well sieve tube in position one to one;
the second sieve holes are arranged on the first sieve tube section and are alternately arranged with the first sieve holes in rows on the middle sieve tube along the circumferential direction of the cross section of the middle sieve tube;
when the middle screen pipe rotates to a first position, the second screen holes are aligned with the screen holes on the inner well screen pipe, and the first screen holes are staggered with the screen holes on the inner well screen pipe;
when the middle screen pipe rotates to the second position, the first screen holes are aligned with the screen holes on the inner well screen pipe.
3. A groundwater remediation system as claimed in claim 1 or claim 2, wherein: the aeration system also comprises an air storage tank and an air pump which are arranged on the ground;
the gas storage tank, the gas pump and the aeration pipe are connected in sequence.
4. A groundwater remediation system as claimed in claim 1 or claim 2, wherein: the exhaust pipe is connected with a vacuum pump and an active carbon adsorption tank on the ground in sequence.
5. A groundwater remediation system as claimed in claim 4, wherein: and control valves are arranged on the exhaust pipe and the aeration pipe.
6. A groundwater remediation system as claimed in claim 4, wherein: and a first annular retaining ring is arranged on the outer wall of the inner well screen pipe, and the bottom end of the middle screen pipe is abutted against the first annular retaining ring in a sealing manner.
7. A groundwater remediation system as claimed in claim 4, wherein: and a second annular baffle ring is arranged in the inner well sieve tube above the underground water level, and a sealing end cover which is in sealing contact with the second annular baffle ring is arranged on the aeration tube.
8. The groundwater remediation method is characterized in that: use of a groundwater remediation system as claimed in any of claims 1 to 7 including the steps of:
rotating the middle sieve tube to a first position;
aerating to the inner well sieve tube through an aeration tube of the aeration system, injecting ozone and/or oxygen into the bottom end of the inner well sieve tube, mixing with the underground water to form a gas-water mixture with low density, and promoting the underground water at the bottom end of the circulating well to continuously flow into the well due to density difference formed inside and outside the circulating well; meanwhile, the gas-water mixture of the screen pipe of the inner well continuously rises, the gas carrying the organic matters is discharged from the well through the exhaust pipe, the underground water is reversely infiltrated back to the aquifer through the first screen pipe section, and an underground water three-dimensional circulating flow field is formed around the circulating well through continuous aeration;
after a certain amount of underground water containing organic pollutants is treated, the middle sieve tube is rotated to a second position, the aeration tube is taken out at the same time, and reaction fillers are added into the inner well sieve tube to form an injection type permeable reaction wall, so that the continuous effect of repairing the underground water is ensured.
9. A groundwater remediation method as claimed in claim 8, wherein: the reaction filler adopts modified zero-valent iron or clay mineral.
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| CN202010323131.9A CN111484122B (en) | 2020-04-22 | 2020-04-22 | Underground water remediation system and method |
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| CN202010323131.9A CN111484122B (en) | 2020-04-22 | 2020-04-22 | Underground water remediation system and method |
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| CN111484122B CN111484122B (en) | 2022-06-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112775168A (en) * | 2020-12-08 | 2021-05-11 | 河海大学 | System and method for repairing underground water by using in-situ segmented sieve well |
| CN113311133A (en) * | 2021-06-23 | 2021-08-27 | 成都理工大学 | Test method for repairing heterogeneous soil groundwater |
| CN114275873A (en) * | 2021-12-13 | 2022-04-05 | 大庆三宝环保科技有限公司 | Polluted underground water repairing system and method |
| CN115504623A (en) * | 2022-08-22 | 2022-12-23 | 中国石油化工股份有限公司 | Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application |
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| CN112775168A (en) * | 2020-12-08 | 2021-05-11 | 河海大学 | System and method for repairing underground water by using in-situ segmented sieve well |
| CN112775168B (en) * | 2020-12-08 | 2022-03-18 | 河海大学 | System and method for repairing underground water by using in-situ segmented sieve well |
| CN113311133A (en) * | 2021-06-23 | 2021-08-27 | 成都理工大学 | Test method for repairing heterogeneous soil groundwater |
| CN113311133B (en) * | 2021-06-23 | 2022-08-09 | 成都理工大学 | Test method for repairing heterogeneous soil groundwater |
| CN114275873A (en) * | 2021-12-13 | 2022-04-05 | 大庆三宝环保科技有限公司 | Polluted underground water repairing system and method |
| CN115504623A (en) * | 2022-08-22 | 2022-12-23 | 中国石油化工股份有限公司 | Device for treating volatile D-NAPL (D-NAPL) by using filler to reinforce underground water circulating well and application |
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