CN106906834B - Improved multiphase extraction system and method based on light well point dewatering process - Google Patents
Improved multiphase extraction system and method based on light well point dewatering process Download PDFInfo
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D19/00—Keeping dry foundation sites or other areas in the ground
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- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
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- E02D19/06—Restraining of underground water
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Abstract
The invention discloses an improved multiphase extraction system and method based on a light well point dewatering process, wherein the extraction system comprises an underground multiphase extraction well group and a ground jet type vacuum system; the ground jet type vacuum system is provided with a water replenishing pipeline, and the working water in the ground jet type vacuum system is maintained to be sufficient by controlling the proper amount of water replenishing of the water replenishing pipeline so as to ensure that the multiphase extraction system operates stably. The ground jet vacuum system comprises a jet vacuum pump, a gas-water separator and a connecting pipeline. The connecting pipeline comprises a water replenishing pipeline which is connected with the gas-water separator and the jet type vacuum pump, and water separated from the gas-water separator is automatically sucked by vacuum suction to be used as working water of the jet type vacuum pump. The invention also provides an extraction method of the extraction system. The improved multiphase extraction system and method based on the light well point dewatering process provided by the invention can adapt to more severe multiphase extraction application scenes, and improve the flexibility and stability of the operation of the multiphase extraction system.
Description
Technical Field
The invention relates to a site pollution remediation system and a site pollution remediation method, in particular to an improved multiphase extraction system and an improved multiphase extraction method based on a light well point dewatering process, which can be applied to a polluted site remediation project.
Background
The light well-point dewatering technology is a common method for artificially reducing the underground water level in the construction of earthwork, foundation and foundation engineering. The method aims to promote soil consolidation and improve foundation strength and slope stability by draining water in foundation soil, and create good construction conditions for next foundation construction. The light well point dewatering device mainly comprises a well point pipe, a water absorption main pipe and extraction equipment. The device is characterized in that a plurality of water-absorbing well point pipes with certain depth are buried around a foundation pit of a project to be built, a water-absorbing main pipe and extraction equipment are installed on the ground, and underground water is continuously pumped from the well point pipes through the extraction equipment, so that the underground water in the foundation pit is gradually reduced to a certain depth. The light well point dewatering device has the advantages of simple equipment, easiness in operation and convenience in management.
The multiphase extraction technology is an in-situ soil and underground water remediation technology, and is characterized in that a vacuum effect is applied to a multiphase extraction well arranged underground, soil gas, polluted underground water and water-insoluble free phases (if existing) in an underground aeration zone and a saturation zone are extracted to the ground, and then the extracted soil gas, polluted underground water and water-insoluble free phases are discharged or treated in the next step after being treated by a ground treatment facility. The target pollutant types which can be applied to the method comprise volatile organic pollutants, biodegradable semi-volatile organic pollutants, recyclable water-insoluble fluid and the like, and the method is widely applied.
At present, the light well point dewatering technology and the multiphase extraction technology are combined for repairing and treating the polluted site in the prior domestic practical research, if the authorization notice number is CN205035816U, the name is a utility model patent of a simple multiphase extraction device based on the light well point dewatering technology, a set of simple multiphase extraction device improved on the basis of the light well point dewatering technology is provided, the equipment and operation maintenance cost can be greatly reduced, and the operation is simple and the technology is mature. However, in a jet vacuum pump commonly used in a light well-point dewatering process, under a severe application scenario such as a multiphase extraction system that the ratio of pumping air and water is too high (mainly pumping soil gas, and only pumping a small amount of underground water), the situation that pumping underground water cannot completely supplement working water (i.e. jet circulating water) in a circulating water tank attached to the jet vacuum pump along with liquid loss discharged from a water outlet of an air-water mixture, so that the extraction efficiency is reduced, equipment such as a circulating water pump/water tank attached to the jet vacuum pump generates heat, and even the equipment has to be shut down for manual water supplement easily occurs. Therefore, it is necessary to improve the jet type vacuum system of the multiphase extraction device on the basis of the existing simple multiphase extraction device based on the light well point dewatering process, so that the jet type vacuum system can adapt to a severer multiphase extraction scene, and the operation flexibility and stability of the multiphase extraction system are improved.
Disclosure of Invention
The invention aims to provide an improved jet type multiphase extraction system and method for polluted site restoration engineering, which can adapt to a more severe multiphase extraction application scene and overcome the defects of the existing simple multiphase extraction device based on a light well point dewatering process in operation practice, thereby improving the operation flexibility and stability of the multiphase extraction system.
In order to achieve the aim, the invention provides an improved multiphase extraction system based on a light well point dewatering process, which is used for repairing underground water in soil of a polluted site, wherein the extraction system comprises an underground multiphase extraction well group and a ground jet type vacuum system; the underground multiphase extraction well group comprises a plurality of underground multiphase extraction wells; the ground jet-type vacuum system is internally provided with a water replenishing pipeline, so that the working water in the ground jet-type vacuum system can be maintained to be sufficient by controlling the proper amount of water replenishing of the water replenishing pipeline under the condition that the extraction system cannot stably operate due to the loss of working water, namely jet circulating water, in the system, so that the multiphase extraction system can stably operate.
The improved multiphase extraction system based on the light well-point dewatering process comprises a jet vacuum pump, a gas-water separator and corresponding connecting pipelines.
The improved multiphase extraction system based on the light well point dewatering process is characterized in that the connecting pipeline comprises a water inlet pipeline, a water drainage pipeline, a waste gas pipeline, a waste water pipeline and a water supplementing pipeline; the water inlet pipeline is connected with the underground multiphase extraction well and the jet type vacuum pump, the water inlet pipeline comprises a plurality of hoses which are respectively connected with the underground multiphase extraction well and a water inlet main pipe which is connected with the hoses and the jet type vacuum pump, a water inlet main regulating valve is arranged on the water inlet main pipe, and a hose regulating valve is respectively arranged on each hose.
The improved multiphase extraction system based on the light well-point dewatering process is characterized in that the drainage pipeline is connected with the jet vacuum pump and the gas-water separator, and drainage water of the jet vacuum pump is discharged into the gas-water separator through the drainage pipeline; the waste gas pipeline is connected with the gas-water separator and the subsequent waste gas treatment system, and the waste water pipeline is connected with the gas-water separator and the subsequent waste water treatment system.
The improved multiphase extraction system based on the light well-point dewatering process is characterized in that two ends of the water supplementing pipeline are respectively connected with the lower part of the gas-water separator and the jet type vacuum pump, and water separated from the lower part of the gas-water separator is automatically sucked from the vacuum suction force generated by the operation of the jet type vacuum pump and is used as working water of the jet type vacuum pump.
In the improved multiphase extraction system based on the light well-point dewatering process, the separated waste gas of the gas-water separator is discharged into a subsequent waste gas treatment system through a waste gas pipeline, and the separated waste water is discharged into the subsequent waste water treatment system through a waste water pipeline or is returned to the incident flow type vacuum pump through a water supplementing pipeline to be used as working water.
The improved multiphase extraction system based on the light well point dewatering process is characterized in that a water supplementing adjusting valve is arranged on the water supplementing pipeline, and the water supplementing adjusting valve and the adjusting valve on the water inlet pipeline jointly control the distribution of the vacuum negative pressure generated by the jet type vacuum pump between the underground multiphase extraction well group and the water supplementing pipeline, so that the water supplementing of the water supplementing pipeline maintains enough working water in the ground jet type vacuum system to enable the multiphase extraction system to stably operate. That is, when the jet-type vacuum device causes the loss of working water due to the overhigh proportion of air and water pumped by the multiphase extraction system, the distribution of vacuum negative pressure between the underground multiphase extraction well group and the water replenishing pipeline can be controlled by the adjusting valve, and enough working water in the ground jet-type vacuum system is maintained by proper amount of water replenishing in the system, thereby realizing the stable operation of the multiphase extraction system
The improved multiphase extraction system based on the light well point dewatering process comprises a plurality of underground multiphase extraction wells, wherein each underground multiphase extraction well comprises a well pipe and a sieve pipe arranged at the lower part of the well pipe, and the length of the sieve pipe is greater than the repair depth of the whole underground water.
The improved multiphase extraction system based on the light well point dewatering process is characterized in that the inside of a well pipe of the underground multiphase extraction well is filled with a sand filter layer from the bottom upwards, the filling height is matched with the length of a sieve pipe, the filling height is 0.5m higher than the length of the sieve pipe in the well pipe, and preferably, the sand filter layer is arranged outside the sieve pipe and inside the well pipe, namely, between the sieve pipe and the well pipe. Sealing layers of bentonite are arranged above the sand filtering layer and below the well mouth, and cement paste is used for sealing holes on the ground above the sealing layers.
The invention also provides an extraction method of the improved multiphase extraction system based on the light well point dewatering process, wherein the method comprises the following steps:
step 1, installing a plurality of underground multiphase extraction wells to form an underground multiphase extraction well group; the installation depth of the underground multiphase extraction well is matched with the pollution depth, the length of the sieve tube is greater than the restoration depth of the whole underground water, the filling height of a sand filter layer in the well pipe is matched with the length of the sieve tube and is generally filled to be about 0.5m above the sieve tube, after sand is filled at a well point, the position below a well mouth is sealed and compacted by bentonite, the ground is sealed by cement paste, and the hole sealing depth is reasonably determined according to the actual underground water level; step 2, installing a water inlet pipeline; the installed underground multiphase extraction wells are respectively connected to a water inlet main pipe through hoses, the water inlet main pipe is connected to a water inlet of a jet vacuum pump, each hose is respectively provided with an independent hose adjusting valve for vacuum degree adjustment of a single extraction well, and the water inlet main pipe is provided with a main water inlet adjusting valve for vacuum degree adjustment of an underground multiphase extraction well group; step 3, installing a drainage pipeline, a waste gas pipeline and a waste water pipeline; the water outlet of the jet vacuum pump is connected to a gas-water separator through a drainage pipeline, the gas-water separator is connected with a subsequent waste gas treatment system through a waste gas pipeline, and the gas-water separator is also connected with a subsequent waste water treatment system through a waste water pipeline; step 4, a water replenishing pipeline is arranged between the circulating water tank part at the lower part of the gas-water separator and a water inlet of the jet vacuum pump, water which is automatically sucked and separated from the lower part of the gas-water separator through vacuum suction force generated by the operation of the jet vacuum pump is used as working water of the jet vacuum pump, and an independent water replenishing regulating valve is arranged on the water replenishing pipeline and is used for regulating the vacuum degree of the water replenishing pipeline so as to control water replenishing flow; and 5, extracting the underground water of the polluted site soil by using the installed multiphase extraction system, allowing the underground water-water mixture pumped by the underground multiphase extraction well to enter a gas-water separator for separation treatment, discharging the waste gas into a subsequent waste gas treatment system through a waste gas pipeline, discharging part or all of the waste water into the subsequent waste water treatment system through the waste water pipeline, and using part of the waste water as working water by using a water supplementing pipeline backflow incident flow type vacuum pump.
The improved multiphase extraction system and method based on the light well point dewatering process provided by the invention have the following advantages:
(1) the water replenishing pipeline of the jet type vacuum pump is added on the basis of the existing jet type multiphase extraction system, and the jet type vacuum pump can maintain enough working water in a jet unit/circulating water tank under different extraction scenes by adjusting and controlling the vacuum degree between the water replenishing pipeline and a water inlet main pipe, so that the stable operation of the multiphase extraction system is realized.
(2) The added water supplementing pipeline is simple in design, materials can be selected and installed according to local conditions, increase of construction cost is limited, and investment burden cannot be caused to project implementation.
(3) The control of water supply pipeline is simple, for the operating personnel, only need carry out simple water supply pipeline's regulation operation according to the running state of efflux formula vacuum pump at normal inspection in-process and just can reach sufficient intervention effect, can not cause too much manpower burden to the operating personnel.
(4) The water replenishing of the jet pump takes the water separated from the gas-water separator, namely the pumped underground water, as a water source, and the suction force of the jet vacuum pump as water replenishing power, so that a water source or a power device is not required to be arranged, and the jet pump is energy-saving and environment-friendly.
(5) On the other hand, the multi-phase extraction system can stably operate in different extraction scenes, so that the extraction efficiency is ensured, and the equipment loss and the cost of manpower maintenance are actually reduced.
Therefore, the invention overcomes the defects of the existing simple multiphase extraction device based on the light well point dewatering process in the operation practice by improving the design of the multiphase extraction jet type vacuum system, so that the device can adapt to a more severe extraction scene, thereby improving the flexibility and the stability of the operation of the multiphase extraction system.
Drawings
Fig. 1 is a schematic diagram of an improved multiphase extraction system based on a light well point dewatering process of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in figure 1, the improved multiphase extraction system based on the light well-point dewatering process is used for repairing underground water in soil of a polluted site, and comprises an underground multiphase extraction well group and a ground jet type vacuum system.
The underground multiphase extraction well group comprises a plurality of underground multiphase extraction wells 1; the ground jet type vacuum system is provided with the water replenishing pipeline 15, so that the working water in the ground jet type vacuum system can be maintained to be sufficient by controlling the proper amount of water replenishing of the water replenishing pipeline 15 under the condition that the extraction system cannot stably operate due to the loss of the working water, namely jet circulating water, in the system, so that the multiphase extraction system can stably operate.
The ground jet vacuum system comprises a jet vacuum pump, a gas-water separator 11 and corresponding connecting pipelines. The connecting lines include a water inlet line, a water discharge line 10, a waste gas line 12, a waste water line 13, and a water replenishing line 15.
The water inlet pipeline is connected with the underground multiphase extraction well 1 and the jet type vacuum pump, the water inlet pipeline comprises a plurality of hoses 2 which are respectively connected with the underground multiphase extraction well 1 and a water inlet main pipe 4 which is connected with the hoses 2 and the jet type vacuum pump, a water inlet main regulating valve 5 is arranged on the water inlet main pipe 4, and a hose regulating valve 3 is respectively arranged on each hose 2.
The drainage pipeline 10 is connected with the jet type vacuum pump and the gas-water separator 11, and drainage of the jet type vacuum pump is discharged into the gas-water separator 11 through the drainage pipeline 10; the waste gas pipeline 12 is connected with the gas-water separator 11 and a subsequent waste gas treatment system, and the waste water pipeline 13 is connected with the gas-water separator 11 and the subsequent waste water treatment system.
The two ends of the water replenishing pipeline 15 are respectively connected with the lower part of the gas-water separator 11 and the jet type vacuum pump, and water separated from the lower part of the gas-water separator 11 is automatically sucked by the vacuum suction force generated by the operation of the jet type vacuum pump and is used as working water of the jet type vacuum pump.
The waste gas separated by the gas-water separator 11 is discharged into a subsequent waste gas treatment system through a waste gas pipeline 12, and the separated waste water is discharged into the subsequent waste water treatment system through a waste water pipeline 13 or is returned to the incident flow type vacuum pump through a water supplementing pipeline 15 to be used as working water.
The water replenishing pipeline 15 is provided with a water replenishing regulating valve 14, when the jet type vacuum device causes the loss of working water due to the overhigh proportion of air and water pumped by the multiphase extraction system, the distribution of vacuum negative pressure between the underground multiphase extraction well group and the water replenishing pipeline 15 can be controlled by regulating the water replenishing regulating valve 14 and the regulating valve on the water inlet pipeline, and enough working water in the ground jet type vacuum system is maintained by proper amount of water replenishing in the system, thereby realizing the stable operation of the multiphase extraction system
Each underground multiphase extraction well 1 of the underground multiphase extraction well group comprises a well pipe and a sieve pipe arranged at the lower part of the well pipe, and the length of the sieve pipe is greater than the restoration depth of the whole underground water.
The underground multiphase extraction well 1 is filled with sand filter layers from the bottom to the top in the well casing, the filling height is matched with the length of the sieve tube, the filling height is 0.5m higher than the length of the sieve tube in the well casing, and preferably, the sand filter layers are arranged outside the sieve tube and inside the well casing, namely, between the sieve tube and the well casing. Sealing layers of bentonite are arranged above the sand filtering layer and below the well mouth, and cement paste is used for sealing holes on the ground above the sealing layers.
The invention also provides an extraction method of the improved multiphase extraction system based on the light well point dewatering process, which comprises the following steps:
step 1, installing a plurality of underground multiphase extraction wells 1 to form an underground multiphase extraction well group; step 2, installing a water inlet pipeline; step 3, installing a drainage pipeline 10, a waste gas pipeline 12 and a waste water pipeline 13; step 4, arranging a water replenishing pipeline 15 between the part of the circulating water tank 8 at the lower part of the gas-water separator 11 and the water inlet of the jet vacuum pump, and arranging an independent water replenishing regulating valve 14 on the water replenishing pipeline 15 for regulating the vacuum degree of the water replenishing pipeline 15 so as to control the water replenishing flow; and 5, extracting the underground water of the soil of the polluted site through the installed multiphase extraction system, allowing the underground water-water mixture pumped by the underground multiphase extraction well 1 to enter a gas-water separator 11 for separation treatment, discharging the waste gas into a subsequent waste gas treatment system through a waste gas pipeline 12, discharging part or all of the waste water into the subsequent waste water treatment system through a waste water pipeline 13, and using part of the waste water as working water through a water supplementing pipeline 15 to reflux the incident flow type vacuum pump.
The improved multiphase extraction system and method based on light well point dewatering process provided by the present invention will be further described with reference to the following examples.
Example 1
An improved multiphase extraction system based on a light well point dewatering process comprises an underground multiphase extraction well group and a ground jet type vacuum system.
The underground multiphase extraction well group consists of underground multiphase extraction wells 1 which are matched and designed according to pollution/restoration depth, each underground multiphase extraction well 1 is connected to a water inlet main pipe 4 of a ground jet type vacuum system through a steel wire hose 2 provided with an independent hose adjusting valve 3, and the water inlet main pipe 4 is provided with a water inlet main adjusting valve 5 at the underground multiphase extraction well group part.
The ground jet type vacuum system consists of a jet type vacuum pump, a gas-water separator 11 and corresponding connecting pipelines, when the ground jet type vacuum system operates, working water in a circulating water tank 8 attached to the jet type vacuum pump is pumped out through an attached circulating water pump 6 and pumped into a jet device 7, high-speed jet water flow is formed in the jet device 7, vacuum negative pressure is generated at a water inlet, the vacuum negative pressure is transmitted to an underground multiphase extraction well group through a water inlet main pipe 4 and the like, and therefore underground water, soil gas and the like in a pollution/remediation area are pumped into the circulating water tank 8 together.
The inside of the circulating water tank 8 is provided with a partition plate 9 for preliminary gas-water separation, the separated water is used as working water to be recycled in a ground jet type vacuum system, and the rest gas-water mixture is discharged into a gas-water separator 11 from a water outlet through a water discharge pipeline 10. After gas-water separation, the waste gas is discharged into a subsequent waste gas treatment system through a waste gas pipeline 12, and the waste water is discharged into the subsequent waste water treatment system through a waste water pipeline 13 or is returned to the incident flow type vacuum pump through a water supplementing pipeline 15 to be used as working water.
A water replenishing pipeline 15 is additionally arranged between the gas-water separator 11 and the water inlet main pipe 4 of the ground jet type vacuum system, and an independent water replenishing regulating valve 14 is arranged and used for regulating the vacuum degree of the water replenishing pipeline 15. When the working water loss of the jet pump is caused by the fact that the proportion of gas and water extracted by the multiphase extraction is too high, the water inlet general regulating valve 5 and the water supplementing regulating valve 14 can be regulated to control the distribution of vacuum negative pressure between the underground multiphase extraction well group and the water supplementing pipeline 15, and enough working water in the circulating water tank 8 is maintained through proper water supplementing, so that the stable operation of the multiphase extraction system is realized.
The embodiment also provides an extraction method of the improved multiphase extraction system based on the light well point dewatering process, which comprises the following steps:
step 1, installing a plurality of underground multiphase extraction wells 1 to form an underground multiphase extraction well group; the installation depth of the underground multiphase extraction well 1 is matched with the pollution depth, the length of the sieve tube is larger than the restoration depth of the whole underground water, the filling height of the sand filter layer in the well pipe is matched with the length of the sieve tube, the sand filter layer is generally filled to be about 0.5m above the sieve tube, and preferably, the sand filter layer is arranged outside the sieve tube and inside the well pipe, namely, between the sieve tube and the well pipe. After the well point is filled with sand, sealing and compacting by bentonite below the well mouth, sealing the hole on the ground by cement paste, and reasonably determining the hole sealing depth according to the actual underground water level.
Step 2, installing a water inlet pipeline; the well 1 is connected to the water inlet manifold 4 through the wire hose 2 respectively to the multiphase extraction well in the underground that makes the installation, and the water inlet manifold 4 is connected to the water inlet of efflux formula vacuum pump, sets up solitary hose adjusting valve 3 on every wire hose 2 respectively for the vacuum degree of single extraction well is adjusted, sets up into water total adjusting valve 5 on the water inlet manifold 4, is used for the vacuum degree of the multiphase extraction well crowd in the underground to adjust.
Step 3, installing a drainage pipeline 10, a waste gas pipeline 12 and a waste water pipeline 13; the water outlet of the jet vacuum pump is connected to a gas-water separator 11 through a water discharge pipeline 10, the gas-water separator 11 is connected to a subsequent waste gas treatment system through a waste gas pipeline 12, and the gas-water separator 11 is further connected to a subsequent waste water treatment system through a waste water pipeline 13.
And 4, arranging a water replenishing pipeline 15 between the part of the circulating water tank 8 at the lower part of the gas-water separator 11 and the water inlet of the jet vacuum pump, automatically sucking separated water from the lower part of the gas-water separator 11 through vacuum suction force generated by the operation of the jet vacuum pump to be used as working water of the jet vacuum pump, and arranging an independent water replenishing regulating valve 14 on the water replenishing pipeline 15 for regulating the vacuum degree of the water replenishing pipeline 15 so as to control water replenishing flow.
And 5, extracting the underground water of the soil of the polluted site through the installed multiphase extraction system, allowing the underground water-water mixture pumped by the underground multiphase extraction well 1 to enter a gas-water separator 11 for separation treatment, discharging the waste gas into a subsequent waste gas treatment system through a waste gas pipeline 12, discharging part or all of the waste water into the subsequent waste water treatment system through a waste water pipeline 13, and using part of the waste water as working water through a water supplementing pipeline 15 to reflux the incident flow type vacuum pump.
The improved multiphase extraction system and method based on the light well point dewatering process provided by the invention are composed of an underground multiphase extraction well group and a ground jet type vacuum system, can be applied to soil and underground water restoration engineering of polluted sites such as volatile organic compounds, biodegradable semi-volatile organic compounds, movable dynamic light non-aqueous phase fluid and the like, and have the advantages of mature and reliable technology, short installation and debugging period, simple and flexible operation, low operation and maintenance cost and the like. Meanwhile, the system is improved aiming at the design of a jet type vacuum system pipeline, the flexibility and the stability of the operation of the multiphase extraction system are improved, and the application scene of the light well point dewatering device on the multiphase extraction process system is expanded.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (9)
1. An extraction method of an improved multiphase extraction system based on a light well point dewatering process is characterized by comprising the following steps:
step 1, installing a plurality of underground multiphase extraction wells to form an underground multiphase extraction well group; the installation depth of the underground multiphase extraction well is matched with the pollution depth, the length of the sieve tube is greater than the restoration depth of the whole underground water, the filling height of the sand filter layer in the well pipe is matched with the length of the sieve tube and is filled to be 0.5m above the sieve tube, after sand is filled at a well point, the position below a well mouth is sealed and compacted by bentonite, and the ground is sealed by cement paste;
step 2, installing a water inlet pipeline; the installed underground multiphase extraction wells are respectively connected to a water inlet main pipe through hoses, the water inlet main pipe is connected to a water inlet of a jet vacuum pump, each hose is respectively provided with an independent hose adjusting valve for vacuum degree adjustment of a single extraction well, and the water inlet main pipe is provided with a main water inlet adjusting valve for vacuum degree adjustment of an underground multiphase extraction well group;
step 3, installing a drainage pipeline, a waste gas pipeline and a waste water pipeline; the water outlet of the jet vacuum pump is connected to a gas-water separator through a drainage pipeline, the gas-water separator is connected with a subsequent waste gas treatment system through a waste gas pipeline, and the gas-water separator is also connected with a subsequent waste water treatment system through a waste water pipeline;
step 4, a water replenishing pipeline is arranged between a circulating water tank at the lower part of the gas-water separator and a water inlet of the jet type vacuum pump, water separated from the lower part of the gas-water separator is automatically sucked by vacuum suction force generated by the operation of the jet type vacuum pump and used as working water of the jet type vacuum pump, and an independent water replenishing regulating valve is arranged on the water replenishing pipeline and used for regulating the vacuum degree of the water replenishing pipeline so as to control the water replenishing flow;
step 5, extracting the underground water of the polluted site soil by using the installed multiphase extraction system, allowing the underground water-water mixture pumped by the underground multiphase extraction well to enter a gas-water separator for separation treatment, discharging the waste gas into a subsequent waste gas treatment system through a waste gas pipeline, and discharging the waste water into the subsequent waste water treatment system through a waste water pipeline or using the waste water as working water by using a water supplementing pipeline backflow incident flow type vacuum pump;
the improved multiphase extraction system based on the light well point dewatering process is used for repairing underground water in soil of a polluted site, and comprises an underground multiphase extraction well group and a ground jet type vacuum system; the underground multiphase extraction well group comprises a plurality of underground multiphase extraction wells; the ground jet type vacuum system is internally provided with a water replenishing pipeline, and the working water in the ground jet type vacuum system is maintained to be enough through the water replenishing pipeline so as to ensure that the multiphase extraction system stably operates.
2. The method of claim 1, wherein the surface jet vacuum system comprises a jet vacuum pump, a gas-water separator, and corresponding connecting piping.
3. The method of claim 2, wherein the connecting lines comprise a water inlet line, a water discharge line, an exhaust line, a waste line, and a water supply line; the water inlet pipeline is connected with the underground multiphase extraction well and the jet type vacuum pump, the water inlet pipeline comprises a plurality of hoses which are respectively connected with the underground multiphase extraction well and a water inlet main pipe which is connected with the hoses and the jet type vacuum pump, a water inlet main regulating valve is arranged on the water inlet main pipe, and a hose regulating valve is respectively arranged on each hose.
4. The extraction method of the improved multiphase extraction system based on the light well point dewatering process, as recited in claim 3, wherein the drainage pipeline is connected with a jet vacuum pump and a gas-water separator, and drainage of the jet vacuum pump is discharged into the gas-water separator through the drainage pipeline; the waste gas pipeline is connected with the gas-water separator and the subsequent waste gas treatment system, and the waste water pipeline is connected with the gas-water separator and the subsequent waste water treatment system.
5. The method of claim 3, wherein the two ends of the water supply line are connected to the lower part of the gas-water separator and the jet vacuum pump, and the water separated from the lower part of the gas-water separator is automatically sucked by the vacuum suction force generated by the operation of the jet vacuum pump and used as the working water of the jet vacuum pump.
6. The method for extracting the improved multiphase extraction system based on the light well-point dewatering process as claimed in claim 5, wherein the gas-water separator discharges the separated waste gas into a subsequent waste gas treatment system through a waste gas pipeline, and the separated waste water is discharged into the subsequent waste gas treatment system through the waste gas pipeline or is returned to the incident flow type vacuum pump through a water supplementing pipeline to be used as working water.
7. The method of claim 6, wherein a water replenishing regulating valve is disposed on the water replenishing pipeline, and the water replenishing regulating valve and the regulating valve on the water inlet pipeline jointly control the distribution of the vacuum negative pressure generated by the jet vacuum pump between the underground multiphase extraction well group and the water replenishing pipeline, so that the water replenishing of the water replenishing pipeline maintains enough working water in the ground jet vacuum system to make the multiphase extraction system operate stably.
8. The method for extracting an improved multiphase extraction system based on a light well point dewatering process as claimed in claim 7, wherein each of the underground multiphase extraction wells comprises a well pipe and a sieve pipe arranged at the lower part of the well pipe, and the length of the sieve pipe is greater than the repair depth of the whole underground water.
9. The method for extracting the improved multiphase extraction system based on the light well point dewatering process, according to claim 8, is characterized in that the underground multiphase extraction well is filled with sand filter layers from the bottom upwards in well pipes, the filling height is matched with the length of a sieve pipe, the filling height is 0.5m higher than the length of the sieve pipe in the well pipe, sealing layers of bentonite are arranged above the sand filter layers and below a well mouth, and the ground above the sealing layers is sealed with cement paste.
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| JP2002355663A (en) * | 2001-05-29 | 2002-12-10 | Ichinomiya Kimitake | Soil cleaning system with high pressure jet and method for the same |
| CN201521001U (en) * | 2009-04-10 | 2010-07-07 | 上海熊猫机械(集团)有限公司 | Jet box-type water supply equipment |
| CN201705742U (en) * | 2010-06-18 | 2011-01-12 | 合肥天源热电有限公司 | Water jet air suction system |
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| CN205035816U (en) * | 2015-09-14 | 2016-02-17 | 上海格林曼环境技术有限公司 | Simple and easy heterogeneous extraction device based on light well point precipitation technology |
| CN206784413U (en) * | 2017-05-03 | 2017-12-22 | 上海格林曼环境技术有限公司 | A kind of modified multiphase extraction system based on Application of light well point precipitation technique |
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