CN109967509B - Pollution site normal position multiphase extraction well device - Google Patents
Pollution site normal position multiphase extraction well device Download PDFInfo
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- CN109967509B CN109967509B CN201910363954.1A CN201910363954A CN109967509B CN 109967509 B CN109967509 B CN 109967509B CN 201910363954 A CN201910363954 A CN 201910363954A CN 109967509 B CN109967509 B CN 109967509B
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- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
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Classifications
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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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses an in-situ multiphase extraction well device for a polluted site, which comprises a ground main pipe, an extraction well head, an extraction screen pipe, a liquid phase extraction pipe, a gas phase extraction pipe and a gas injection pipe, wherein the extraction well head and the extraction screen pipe are in sealed connection, one end of the liquid phase extraction pipe penetrates through the extraction well head and is arranged in the extraction screen pipe, the other end of the liquid phase extraction pipe is connected with the ground main pipe, one end of the gas phase extraction pipe is connected with a gas outlet of the extraction well head, the other end of the gas phase extraction pipe is connected with the ground main pipe, and the ground main pipe is connected with a vacuumizing device. The invention can realize the double-channel extraction paths of gas phase and liquid phase at the same time, improves the double ports on the extraction wellhead, not only improves the extraction efficiency, but also greatly saves the well construction cost.
Description
Technical Field
The invention belongs to the technical field of in-situ multiphase extraction equipment of a polluted site, and relates to an in-situ multiphase extraction well device of the polluted site.
Background
The problem of secondary pollution such as peculiar smell diffusion is difficult to control in the process of ectopic treatment due to the volatility characteristics of pollutants in organic pollution sites such as petroleum, chemical industry and pesticides, and the like, and the dewatering and supporting difficulty of an excavated foundation pit is high along with the increase of the pollution depth. Under the background that the green sustainable restoration concept gradually obtains consensus, the in-situ restoration technology can replace the ectopic restoration technology and becomes the main force army of soil restoration. The soil multiphase extraction technology is one of in-situ remediation technologies for treating volatile and semi-volatile organic pollution, has the advantages of convenient operation, easy combination with other technologies, no damage to soil structure and the like, and is one of necessary technologies of soil remediation technologies. The technology is characterized in that an extraction well is built in situ in a polluted site, and organic volatile gas pollutants, polluted underground water, non-aqueous phase liquid (NAPL) and the like in the polluted site are extracted to a ground treatment system for treatment through an extraction pipeline and a pump system, so that pollution elimination of in-situ soil and underground water is realized.
Due to the influence of the hydrogeologic features of the field, the characteristics of organic pollutants and other factors, the repairing effect of the application of the single extraction technology has a certain limit and the tailing repairing phenomenon exists. Therefore, in practical application, in order to widen the application range of the extraction technology and improve the restoration effect, a composite restoration technology mode of in-situ heating, in-situ extraction, in-situ chemical oxidation/reduction, in-situ extraction, biological ventilation and in-situ extraction is often adopted, so as to increase the desorption rate and degradation rate of the organic pollutants, and then the ground is extracted through the extraction technology. The combination technical mode of the enhanced repair greatly widens the application range of the extraction technology, and has wide application prospect in the treatment of chemical industry, pesticides and petroleum pollution sites.
In situ thermal remediation began in the petroleum exploitation industry in the 30 s of the 20 th century and began in the 70 s for the remediation of contaminated sites. The technology mainly comprises a heating system and an extraction system. By raising the temperature of the contaminated area, the physicochemical properties of the contaminants (vapor pressure and solubility increase, viscosity, surface tension, henry coefficient and soil water distribution coefficient decrease) are changed, so that the soil contaminants are promoted to be desorbed into the gas phase and then extracted out of the underground environment. The combination of the technology greatly increases the application range and the repair efficiency of the in-situ technology, and the pollutant removal efficiency can be up to more than 98%. On the other hand, thermal desorption requires energy input, and the extraction process causes heat loss, so that continuous energy (electricity or gas) supply is required to maintain the temperature of the system, resulting in high cost. Therefore, the method can reduce the output heat loss of the extraction system as much as possible while ensuring the pollutant removal effect of the extraction system, and is one of the keys of reducing the in-situ heat repair cost and popularizing technology application.
Disclosure of Invention
The invention aims to solve the technical problems that: the in-situ multiphase extraction well device for the polluted site is provided, and organic pollutants in soil and underground water are removed through gas-liquid multiphase extraction, so that the effects of high efficiency and energy conservation are achieved, and the problems in the prior art are solved.
The technical scheme adopted by the invention is as follows: the in-situ multiphase extraction well device for polluted site includes ground main pipe, extraction well head, extraction sieve pipe, liquid phase extraction pipe, gas phase extraction pipe and gas injection pipe.
Preferably, the above-mentioned vacuum-pumping device is connected to a gas-liquid separation system.
Preferably, the extraction sieve tube is provided with a plurality of sieve slits which are uniformly arranged along the sieve tube direction at intervals, the extraction sieve tube is arranged in a vertical downward well hole which is preset in a polluted site, the diameter of the well hole is larger than the outer diameter of the extraction sieve tube, a filtering filling filler structure is arranged between the inside of the well hole and the extraction sieve tube, and the upper part of the sieve slits is positioned at the upper side of an underground saturated aquifer.
Preferably, the filling filler structure comprises a hole from bottom to top filtering layer, a fine sand layer and a hole sealing layer.
Preferably, the filter layer is made of coarse sand or quartz sand or graded filter material, and the hole sealing layer is made of cement grouting.
Preferably, the upper end of the extraction well head is provided with an interface for installing a liquid phase extraction pipe, and the side surface is provided with a gas phase outlet and a pressure relief valve which are connected with the gas phase extraction pipe.
Preferably, the liquid phase extraction pipe is connected with an air injection pipe through a three-way joint, the inner end of the air injection pipe stretches into the liquid phase extraction pipe to be close to the lower end, a valve I and a check valve I are arranged on the liquid phase extraction pipe, and the valve I and the check valve I are positioned between the three-way joint and the ground main pipe.
Preferably, one end of the vapor extraction pipe is connected to the extraction wellhead through a second valve, and the other end is connected to the ground main pipe through a second check valve.
Preferably, the surface of the well where the extraction screen is inserted into the well is covered with a concrete layer.
Preferably, the well bores and the extraction sieve tubes cover the pollution site range, the well bores are uniformly distributed at intervals, and a plurality of extraction sieve tubes are arranged in the well bores at uniform intervals.
The invention has the beneficial effects that: compared with the prior art, the invention has the following effects:
(1) Compared with a common multiphase extraction well, the multiphase extraction well device can realize a double-channel extraction path of gas phase and liquid phase at the same time, and double-port improvement on the extraction well head not only improves the extraction efficiency, but also greatly saves the well construction cost;
(2) The gas path and the liquid path channel on the multiphase extraction well device are respectively provided with a valve capable of adjusting flow, and the extraction gas quantity and the liquid phase flow can be flexibly adjusted according to the actual operation condition requirements;
(3) The multiphase extraction well device is provided with the gas injection pipe in the liquid phase extraction pipe, so that groundwater or nonaqueous phase liquid can be extracted more easily by means of intermittent aeration, and the vacuum degree requirement of the system is reduced. The device is suitable for both normal temperature and heating conditions. Particularly under the heating condition, the aeration effect of the gas injection pipe can promote the high-concentration extraction of pollutants in the underground water in the form of bubbles, thereby reducing the water content in the extraction liquid phase, avoiding the system heat loss caused by extraction of a large amount of water and achieving the effect of energy conservation.
Drawings
FIG. 1 is a schematic illustration of a well tubular structure;
FIG. 2 is a schematic illustration of a well tubular connection;
FIG. 3 is a view showing the construction of the inside of the gas injection pipe.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Example 1: as shown in fig. 1-3, an in-situ multiphase extraction well device for a polluted site comprises a ground main pipe 1, an extraction well head 2, an extraction screen pipe 3, a liquid phase extraction pipe 4, a gas phase extraction pipe 5 and a gas injection pipe 6, wherein the extraction well head 2 and the extraction screen pipe 3 are in sealing connection, one end of the liquid phase extraction pipe 4 is arranged in the extraction screen pipe 3 through the extraction well head 2, the other end of the liquid phase extraction pipe 4 is connected with the ground main pipe 1, one end of the gas phase extraction pipe 5 is connected with a gas phase outlet 21 of the extraction well head 2, the other end of the gas phase extraction pipe is connected with the ground main pipe 1, the ground main pipe 1 is connected with a vacuumizing device 13, a buffer tank 14 is arranged at the front end of the vacuumizing device 13, the extracted polluted gas and liquid are fed into a system at the rear end to be subjected to gas-liquid separation and treatment, and the extraction screen pipe 3 and the extraction well head 2 are uniformly arranged at the same intervals in the polluted site, and are connected to the ground main pipe 1.
Preferably, the front end of the vacuum pumping device 13 (vacuum pump) is provided with a buffer tank 14, the rear end is connected to a gas-liquid separation system, and gas-liquid separation is performed on the gas-liquid pollution mixture of the volatile pollutants collected and pumped in situ and the polluted groundwater and non-aqueous liquid, so that the polluted gas and liquid can be further treated, the buffer tank 14 has a buffer pipeline structure, impact damage to the vacuum pumping device is avoided, and the service life of the vacuum pumping device is prolonged.
Preferably, the extraction sieve tube 3 is provided with a plurality of sieve slits 31 uniformly distributed along the sieve tube direction at intervals, the sieve slit 31 is provided with a sieve range covering the whole vertical pollution area in the vertical direction, the sieve slit range and the sieve tube bottom are provided with a set interval, the sieve tube bottom is sealed and used for collecting liquid, the distance between the upper part of the sieve slit 31 range and the ground is greater than 50cm, the extraction sieve tube 3 is arranged in a vertical downward well hole 7 preset in the pollution field, the diameter of the well hole 7 is greater than the outer diameter of the extraction sieve tube 3 by more than 5cm, a filtering filling filler structure filled with filler is arranged between the inside of the well hole 7 and the extraction sieve tube 3, the upper part of the sieve slit 31 is positioned at the upper side of the underground saturated aquifer 12 and ensures that enough sieve slits are used for capturing gas phase pollutants, the depth of the well hole 7 and the length of the extraction sieve tube 3 are determined according to the polluted depth, the material of the extraction sieve tube 3 is required to meet the requirement, and the requirement of high temperature resistance is required to be met under the heating condition.
In order to prevent sand particles in the soil from blocking the screen joints, the width of the screen joints 31 of the extraction well pipe is 0.25-0.50 mm, and the screen joints are determined according to the soil properties of the field. The diameter of the well pipe 3 is about 10-20 cm, the diameter of the well hole 7 is about 15-30 cm, a filler is filled between the outer wall of the well pipe and the wall of the well hole to form a filler filling structure, and the filler filling structure comprises a well hole filtering layer 10, a fine sand layer 9 and a hole sealing layer 8 with the thickness of 20cm from bottom to top; the filter layer 10 is made of coarse sand or quartz sand or graded filter material, the minimum grain diameter of the coarse sand or quartz sand or graded filter material is larger than the width of a screen gap, the filling range is 15cm from the bottom of a well to the upper end of the screen gap, the hole sealing layer 8 is made of cement grouting, the fine sand layer 9 is made of fine sand, and the filling thickness is about 15cm, so that grouting cement infiltration is prevented.
Preferably, the upper end of the extraction wellhead 2 is provided with an interface 22 for installing the liquid phase extraction pipe 4, the side surface is provided with a gas phase outlet 21 and a pressure relief valve 24 which are connected with the gas phase extraction pipe 5, and the pressure relief valve 24 can be used for pressure relief and can be used as a gas sample collection interface.
The liquid extraction pipe 4 is inserted into the extraction screen pipe 3, and is positioned at a position about 4cm away from the bottom of the screen pipe, and a liquid extraction pipe joint on the extraction wellhead is sealed with the liquid extraction pipe, so that the leakage of the system is prevented. The liquid phase extraction pipe should satisfy high temperature resistant and corrosion demand, in order to guarantee the liquid phase extraction effect, be connected with gas injection pipe 6 through tee bend 41 on above-mentioned liquid phase extraction pipe 4, gas injection pipe 6 inner stretches into in the liquid phase extraction pipe 4 near the lower extreme, install valve one 42 and check valve one 23 of flow control function on the liquid phase extraction pipe 4, valve one 42 and check valve one 23 are located between tee bend 41 and the ground main 1, gas injection pipe is connected to air compressor 63, install relief valve 62 on the gas injection pipe, through the intermittent type aeration of gas injection pipe, make liquid also be easily extracted under less vacuum degree, the vacuum degree demand of system has been reduced, gas injection pipe length extends to about 10~30cm from the liquid phase extraction pipe bottom, the diameter is about 1/4 of liquid phase extraction pipe diameter, the tubular product can adopt thick wall Teflon pipe, satisfy high temperature resistant and corrosion resistant demand. To prevent the outlet of the gas injection tube 6 from clogging, a bottom-sealed sleeve 61 is fixed to the end, the diameter of the sleeve being 2 times the diameter of the gas injection tube and the length being about 10cm.
Preferably, the vapor extraction pipe 5 is connected to the extraction wellhead 2 at one end thereof via a second valve 51, and connected to the above-ground main pipe 1 at the other end thereof via a second check valve 52.
In order to ensure the vacuum degree of an extraction well site, prevent rainwater from seeping and prevent polluted gas from diffusing under the heating condition, the in-situ restoration multiphase extraction well device provided by the invention is arranged in the restoration range of the polluted site, the ground is provided with a concrete layer 11, the concrete layer is divided into an upper layer and a lower layer, the lower layer is fiber bubble concrete, and the upper layer is common concrete.
Preferably, the well holes 7 and the extraction sieve tube 3 cover the pollution site, the well holes 7 are uniformly distributed at intervals, the extraction sieve tube 3 is arranged in a plurality of well holes 7 uniformly distributed in the site, and the whole repair area is covered, so that the extraction effect is ensured.
Example 2: a multiphase extraction well device for in-situ remediation engineering of a contaminated site is used for remediation of soil and groundwater of a volatile organic contaminated site, and comprises an overground main pipe and an extraction well pipe, wherein the extraction well pipe comprises an extraction well head, an extraction sieve pipe, a vapor extraction pipe, a liquid extraction pipe and an air injection pipe. One end of the ground main pipe is connected with the buffer tank, the vacuum pump and the gas-liquid separation system, and one end of the gas injection pipe is connected with the air compressor. The construction depth of the extraction well is 10.5m, the diameter of the well is 15cm, the length of the extraction well pipe is 10m, the diameter of the extraction well pipe is 10cm, and the well spacing is 4.5m. The extraction well pipe and the ground main pipe are both UPVC materials. The width of the screen slot of the extraction well pipe is 0.3mm, the spacing between the slots is 3mm, and the screen opening range is 2m to 9.5m underground. The space between the underground 1m and the well pipe at the bottom of the well and the extraction well wall is filled with quartz sand with the grain diameter of 0.5-1.0 mm, bentonite is wrapped at the position 20cm to 1m of the underground, and the underground 20cm to the surface of the well is sealed by cement grouting. The extraction well pipe is exposed out of the ground surface by 0.4m so as to be connected with the extraction well head. One end of the liquid phase extraction pipe is connected with the ground main pipe and is provided with a check valve and a valve, and the other end of the liquid phase extraction pipe is inserted into the depth position of about 9.8m from the extraction wellhead. The gas injection pipe is arranged in the liquid phase extraction pipe, and the aeration quantity and the aeration frequency are controlled by the pneumatic valve. One end of the vapor extraction pipe is connected with the ground main pipe and is provided with a check valve and a valve, and the other end of the vapor extraction pipe is connected with an air outlet on the extraction wellhead. The repair area is covered with a 15cm thick layer of concrete.
And (5) completing the pipeline connection and detecting the air tightness. When the system is debugged, the valve for liquid phase extraction is closed, the valve for vapor phase extraction is opened, and the vacuum pump is started. Regulating the vacuum degree of the system to ensure that the vapor extraction reaches the flow design value of 500m after the system is stable 3 And/h. And opening a liquid phase extraction valve, closing a vapor phase extraction valve, and performing liquid phase extraction debugging. The aeration quantity of the gas injection pipe is regulated to be about 4m 3 Every 6s aeration time is opened, the stop is 40s, and the pumping speed is about 5m 3 /h。
Example 3: a multiphase extraction well device for in-situ remediation engineering of a polluted site is used for in-situ thermal desorption remediation of an organic polluted site and comprises an overground main pipe and an extraction well pipe, wherein the extraction well pipe comprises an extraction well head, an extraction sieve pipe, a vapor extraction pipe, a liquid extraction pipe and an air injection pipe. One end of the ground main pipe is connected with the buffer tank, the condenser, the vacuum pump, the gas-liquid separation system and the dehumidifier, and one end of the gas injection pipe is connected with the air compressor. The extraction well pipe and the upper main pipe are both made of carbon steel. The construction depth of the extraction wells is 8.5m, the diameter of the wells is 15cm, and the spacing between the wells is 5.25m. The diameter of the extraction sieve tube is 10cm, the length of the underground part is 8m, the width of the sieve slit is 0.25mm, the distance between the cutting slits is 1.5mm, and the sieve opening range is 2m to 7.5m underground. The length of the overground part of the sieve tube is 0.4m, so as to connect and install the extraction wellhead. Quartz sand with the grain size of 0.5-1.0 mm is filled between a sieve tube and an extraction well wall in the range from 1m underground to the well bottom, fine sand with the grain size of 0.25-0.125 mm is filled at the position from 20cm underground to 1m underground, and the position from 20cm underground to the surface of the well is sealed by cement grouting.
The highest heating temperature of the system in-situ thermal desorption can reach 120 ℃. The liquid phase extraction tube and the gas phase extraction tube adopt a DN25 PEX tube, the gas injection tube adopts a Teflon tube, and the gas injection tube is inserted into the liquid phase extraction tube through a stainless steel tee joint. All meet the requirements of high temperature resistance and corrosion resistance.
In order to meet the heat preservation requirement of system heating, after the well is built and the repair area is leveled, a layer of broken stone layer is paved, a foam concrete layer with the thickness of 15cm is poured for heat preservation, the maintenance is carried out for more than 12 hours, and then a common concrete layer with the thickness of 5cm is poured on the heat preservation layer. Considering the heat radiation area, the concrete coverage exceeds the repair area boundary by at least 2m.
After the system is built and debugged, the extraction system is started, the vacuum degree of the system is regulated, and after the system is stabilized, the vapor extraction reaches the flow design value of 300m 3 And/h, opening a liquid phase extraction valve, closing a vapor phase extraction valve, performing liquid phase extraction debugging, and adjusting the aeration rate of the gas injection pipe to be about 2.7m 3 Every 4s aeration time is started, the aeration time is stopped for 60s, and the liquid phase extraction rate reaches the design value of 2.64 and 2.64 m 3 And/h, after the stable operation is carried out for 48h, restarting the in-situ thermal desorption heating system to prevent heating from being startedThe contaminants diffuse out. After heating, the concentration of the underground gas steam is increased, the pressure is increased, and the extraction gas amount and the water amount are required to be adjusted according to the actual operation effect, so that the normal operation of the system is ensured.
The multiphase extraction well device for the polluted site in-situ remediation engineering provided by the invention can be independently used for the extraction treatment of the polluted site soil and underground water, and can also be used in combination with in-situ technologies such as in-situ thermal desorption and the like. The device simple structure, design benefit realizes the binary channels extraction route of gaseous phase and liquid phase simultaneously, and construction cost is low, and extraction efficiency is high, and the practicality is strong.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (8)
1. The utility model provides a contaminated site normal position multiphase extraction well device which characterized in that: the device comprises a ground main pipe (1), an extraction well head (2), an extraction screen pipe (3), a liquid phase extraction pipe (4), a vapor phase extraction pipe (5) and an air injection pipe (6), wherein the extraction well head (2) is in sealing connection with the extraction screen pipe (3), one end of the liquid phase extraction pipe (4) passes through the extraction well head (2) to be arranged in the extraction screen pipe (3), the other end of the liquid phase extraction pipe is connected with the ground main pipe (1), one end of the vapor phase extraction pipe (5) is connected with a vapor phase outlet (21) of the extraction well head (2), the other end of the vapor phase extraction pipe is connected with the ground main pipe (1), and the ground main pipe (1) is connected with a vacuumizing device (13); the liquid phase extraction pipe (4) is connected with an air injection pipe (6) through a three-way joint (41), the inner end of the air injection pipe (6) stretches into the liquid phase extraction pipe (4) to be close to the lower end, a valve I (42) and a check valve I (23) are arranged on the liquid phase extraction pipe (4), the valve I (42) and the check valve I (23) are positioned between the three-way joint (41) and the ground main pipe (1), and the extracted liquid phase is intermittently aerated through the air injection pipe; the vacuumizing device (13) is connected to the gas-liquid separation system.
2. A contaminated site in situ multiphase extraction well installation, as recited in claim 1, wherein: the extraction screen pipe (3) is provided with a plurality of screen slits (31) which are uniformly distributed along the screen pipe direction at intervals, the extraction screen pipe (3) is arranged in a vertical downward well hole (7) which is preset in a polluted site, the diameter of the well hole (7) is larger than the outer diameter of the extraction screen pipe (3), a filtering filling filler structure is arranged between the inside of the well hole (7) and the extraction screen pipe (3), and one section of the upper part of the screen slits (31) is positioned on the upper side of an underground saturated aquifer (12).
3. A contaminated site in situ multiphase extraction well installation, according to claim 2, wherein: the filling filler structure comprises a filter layer (10), a fine sand layer (9) and a hole sealing layer (8) from bottom to top.
4. A contaminated site in situ multiphase extraction well installation according to claim 3, wherein: the filter layer (10) is made of coarse sand or quartz sand or graded filter material, and the hole sealing layer (8) is made of cement grouting.
5. A contaminated site in situ multiphase extraction well installation, as recited in claim 1, wherein: the upper end of the extraction well head (2) is provided with an interface (22) for installing a liquid phase extraction pipe (4), and the side surface is provided with a gas phase outlet (21) and a pressure relief valve (24) which are connected with a gas phase extraction pipe (5).
6. A contaminated site in situ multiphase extraction well installation, as recited in claim 1, wherein: one end of the vapor extraction pipe (5) is connected to the extraction wellhead (2) through a valve II (51), and the other end is connected to the ground main pipe (1) through a check valve II (52).
7. A contaminated site in situ multiphase extraction well installation, as recited in claim 1, wherein: the extraction screen (3) is inserted into the well hole (7) and covered with a concrete layer (11).
8. A contaminated site in situ multiphase extraction well installation, as recited in claim 1, wherein: the well holes (7) and the extraction sieve tube (3) cover the pollution site range, and the well holes (7) are uniformly arranged at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910363954.1A CN109967509B (en) | 2019-04-30 | 2019-04-30 | Pollution site normal position multiphase extraction well device |
Applications Claiming Priority (1)
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