CN111960484A - Multidirectional three-dimensional circulation in-situ remediation system - Google Patents
Multidirectional three-dimensional circulation in-situ remediation system Download PDFInfo
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- 238000005067 remediation Methods 0.000 title claims abstract description 53
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 35
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
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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
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2209/04—Oxidation reduction potential [ORP]
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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
- C02F2209/05—Conductivity or salinity
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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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
Abstract
The invention discloses a multidirectional three-dimensional circulating in-situ restoration system which comprises a restoration well and a monitoring well, wherein the restoration well and the monitoring well are vertically and alternately arranged on a site to be restored; the monitoring well monitors the soil characteristic, the underground water flow field and the pollution plume change data information of a site to be repaired, and the control part adjusts the underground water extraction and/or the injection of the repairing agent of the repairing well to be carried out among different wells and different well screen sections of each well according to the obtained data information so as to promote the multidirectional three-dimensional circulation of the underground water and the agent and realize the efficient removal of the pollution along with the water flow or the full contact reaction of the agent and the pollutants. The multidirectional three-dimensional circulation in-situ remediation system provided by the invention is reasonable in structure, intelligently and flexibly sets underground water pumping and medicament injection, promotes multidirectional three-dimensional circulation of underground water and medicament, realizes efficient removal of pollution along with water flow or full and uniform contact reaction between the medicament and pollutants, improves the utilization rate of the injected medicament, saves the remediation cost and improves the remediation effect.
Description
Technical Field
The invention relates to the technical field of pollution treatment, in particular to a multidirectional three-dimensional circulating in-situ remediation system.
Background
Poor management in human industrial production activities leads to the leakage of contaminants, often resulting in soil and groundwater contamination. Soil and groundwater pollution has the characteristics of concealment, long-term property, complexity and the like, and once formed, the pollution is difficult to treat and repair. Because the soil has heterogeneity, different soil media have different conditions such as permeability, organic matter content and the like, so that the interception and enrichment capacities of pollutants are different, and generally, the smaller the permeability coefficient of the soil is, the lower the migration speed of the pollutants is; and the higher the organic matter content of the soil is, the stronger the pollutant enriching capacity is.
Generally, the soil medium has the capability of retaining and enriching pollutants from strong to weak, namely clay > silt > sandy soil > gravel. The clay has low permeability coefficient and strong dirt intercepting capability. For example, researches show that the retention rate of petroleum pollutants on a clay layer is 70-90%, and the retention rate of a sand layer is 20-50%. The heterogeneous nature of this soil medium has a tremendous impact on the removal of contaminants from soil and groundwater, resulting in significant limitations on the effectiveness and efficiency of many conventional soil and groundwater remediation techniques. Groundwater flow or contaminant/agent migration involved in conventional remediation techniques for soil and groundwater contamination, such as groundwater extraction treatment, in situ chemical oxidation (or reduction), in situ bioremediation, etc., are strongly related to the heterogeneous nature of the soil medium. The traditional pumping treatment mode is to establish a pumping well in the whole pollution layer, however, the formed underground water flow field and the corresponding pollution migration path are mostly in the transverse single direction, and the main migration occurs in a sandy soil layer with strong permeability. Similarly, in-situ chemical oxidation and in-situ bioremediation also typically employ injection wells across the entire contaminated layer when the agent is injected, and the agent migration path thus formed is also mostly in a single lateral direction, and the main migration occurs from a highly permeable sandy soil layer. This can result in areas of relatively poor permeability that are wrapped with contaminants that are difficult to remove or that are difficult for the agent to reach areas of relatively poor permeability that do not interact with the contaminants, creating blind repair zones.
Patent CN107626730A discloses an extraction well group for in-situ remediation engineering of contaminated sites, comprising an extraction main pipe and a plurality of extraction well pipes respectively connected with the extraction main pipe, wherein the other end of the extraction main pipe is provided with a vacuum pump; the extraction well pipe comprises a plurality of vertical well type extraction wells vertically arranged in a polluted site and a plurality of horizontal well type extraction wells horizontally arranged in surface soil of a polluted area. The extraction well pipe is provided with a plurality of sieve holes or sieve slits which are evenly spaced along the direction of the well pipe. The vertical shaft type extraction wells are respectively arranged in a plurality of soil holes which are preset in the polluted site and face downwards from the ground; the vertical shaft type extraction well comprises an associated extraction well and an independent extraction well, wherein each associated extraction well and one heating well are arranged in one soil hole, and each independent extraction well is independently arranged in one soil hole. The invention can not adjust injection of the injection well and extraction of the pumping well according to the changes of soil layer medium permeability, underground water flow field and pollution feather.
The existing in-situ injection well and pumping well combined technology is still in an initial stage, the adjustment of the working time, frequency and the like of injection well injection and pumping well extraction mainly depends on field implementation experience, and the injection well injection and pumping well extraction cannot be adjusted according to the changes of soil layer medium permeability, underground water flow field and pollution feather, so that the problems of small permeability coefficient, limited restoration effect of a polluted area with high organic matter content, injection medicament waste and the like are caused.
Therefore, it is necessary to design a multi-directional three-dimensional circulation in-situ remediation system to solve the technical problems in the prior art.
Disclosure of Invention
The multidirectional three-dimensional circulation in-situ remediation system is reasonable in structure, intelligently and flexibly sets underground water pumping and medicament injection, promotes multidirectional three-dimensional circulation of the underground water and the medicament, realizes efficient removal of pollution along with water flow or full and uniform contact reaction between the medicament and pollutants, improves the utilization rate of the injected medicament, saves remediation cost and improves remediation effect.
In order to solve the technical problems, the multidirectional three-dimensional circulating in-situ restoration system provided by the invention comprises a restoration well and a monitoring well, wherein the restoration well and the monitoring well are vertically and alternately arranged on a site to be restored; the monitoring well is provided with a monitoring sensor, and the repairing well is connected with the water processing unit and the dispensing unit through a switching device.
Preferably, the repair wells are distributed in a plum blossom shape, and monitoring wells are arranged in the middle of a triangle formed by the three repair wells.
Preferably, the well is provided with a pipe integrating injection and extraction, herein referred to as injection/extraction pipe; the injection/extraction pipe is connected with the water treatment unit and the dispensing unit through a switching device, the switching device is switched to an extraction state, and the injection/extraction pipe extracts underground water so that pollution flows to the water treatment unit along with water flow for treatment; the switching device is switched to an injection state, and the injection/extraction pipe injects the medicament so that the medicament is in sufficiently uniform contact with the pollutants through the repair well.
Preferably, the inner wall of the repair well is provided with a sheath screen pipe, the injection/extraction pipe is arranged in the sheath screen pipe and can move up and down, and an upper blocker and a lower blocker are arranged between the sheath screen pipe and the injection/extraction pipe.
In some embodiments, the outer peripheral wall of the jacketed screen is provided with fluid holes spaced along the length of the jacketed screen; the peripheral wall of the injection/extraction pipe is also provided with a through hole; pumping underground water containing pollutants to a water treatment unit through a fluid hole of the sheath sieve tube, a closed space formed by the upper barrier and the lower barrier and a through hole of the injection/extraction tube; the medicament flows to the area to be repaired through the through hole of the injection/extraction pipe, the closed space formed by the upper baffle and the lower baffle and the fluid hole of the sheath screen pipe to realize injection.
In some embodiments, the upper and lower barriers are provided with a pressurized pipe connected to a pressurized pump to pressurize and expand the barriers to seal up and down between the injection/extraction pipe and the sheath screen.
In some embodiments, the pressurized tube is provided with a pressure relief valve to relieve the enclosed space by reducing the pressure relief of the upper and lower barriers.
Preferably, the injection/extraction pipe is driven by a power device to move up and down in the sheath screen pipe.
In some embodiments, the inside of the monitoring well is provided with monitoring sensors that monitor soil/groundwater physicochemical properties and contaminant concentrations in real time.
Preferably, the monitoring well monitors the soil characteristic, the groundwater flow field and the pollution plume change data information of the site to be repaired, the control part finds the water flow permeability advantage channel according to the obtained data information, the switching device is manually adjusted, the extraction or injection state of the repair well is determined, the groundwater extraction or the medicament injection of the repair well is carried out in different wells and different depths of each well, the adverse effect of the water flow permeability advantage channel is fully avoided, the multidirectional three-dimensional circulation of the groundwater and the medicament is promoted, and the pollution is efficiently removed along with the water flow or the medicament and the pollutant are fully contacted and reacted.
As preferred technical scheme, make up the not enough of artifical adjustment, this scheme still includes the control part, control part and monitoring sensor, auto-change over device and power device communication connection. The control part can select a PLC control circuit common in the field to realize automatic control.
In some embodiments, the monitoring sensor may be moved along the length of the monitoring well to monitor soil/groundwater physicochemical properties and contaminant concentrations at different depths.
In some embodiments, the control part is a cloud processing platform, which draws the spatial distribution of the groundwater flow field and the pollution plume according to the soil/groundwater physicochemical properties and pollutant concentration data at different depths acquired by the monitoring sensors, and controls the switching device and/or the power device in combination with the repair well distribution position.
The invention also provides a multidirectional three-dimensional circulation in-situ remediation method, which adopts the multidirectional three-dimensional circulation in-situ remediation system and comprises the following specific steps:
s1, monitoring soil/underground water physicochemical property and pollutant concentration data by a monitoring sensor in real time, inputting the soil/underground water physicochemical property and pollutant concentration data into a cloud processing platform, and drawing an underground water flow field by the cloud processing platform by adopting a MODFLOW model such as GMS software;
s2, inputting soil/underground water physicochemical property and pollutant concentration data into a cloud processing platform, wherein the cloud processing platform adopts MT3DMS (MT 3 DMS) such as GMS software as a pollutant migration model, simulates the change condition of pollutants, and draws the spatial distribution of pollution plume;
s3, combining the groundwater flow field, the pollution plume spatial distribution and the distributed repair well distribution positions obtained in the above steps, simulating by using a FEMWATER model such as GMS software by using a cloud processing platform, and outputting a multidirectional three-dimensional circulation pumping and injecting scheme, wherein the multidirectional three-dimensional circulation pumping and injecting scheme comprises switching, working time, flow and pumping/injecting depth positions of injection or pumping of each repair well at upstream and downstream;
and S4, controlling a switching device and a power device to execute the multidirectional stereoscopic circulation pumping scheme according to the multidirectional stereoscopic circulation pumping scheme output in the step S3, and adjusting the injection or extraction of the repair well. Preferably, the steps S1-S4 are periodically updated and repeated.
Further, the soil/groundwater physicochemical properties and contaminant concentration data described above include permeate flow, water level, pH, DO, conductivity, ORP, target contaminant concentration.
The invention has the beneficial effects that:
the multidirectional three-dimensional circulation in-situ remediation system provided by the invention is reasonable in structure, flexibly sets underground water pumping and medicament injection, promotes multidirectional three-dimensional circulation of the underground water and the medicament, fully avoids adverse effects of a water flow permeation dominant channel, realizes efficient removal of pollution along with water flow or fully and uniformly contact reaction between the medicament and pollutants, improves the utilization rate of the injected medicament, saves remediation cost and improves remediation effect.
Drawings
The above advantages of the present invention will become more apparent and more readily appreciated from the detailed description set forth below when taken in conjunction with the drawings, which are intended to be illustrative, not limiting, of the invention and in which:
FIG. 1 is a schematic structural diagram of a multi-directional three-dimensional cyclic in-situ remediation system according to the present invention;
FIG. 2 is a schematic view of the placement of the remediation and monitoring wells of the present invention;
FIG. 3 is a schematic diagram of a well repair according to the present invention;
FIG. 4 is an enlarged partial view of the jacketed screen of the present invention;
FIG. 5 is a schematic view of one embodiment of a multi-directional three-dimensional cyclic in situ remediation system of the present invention;
FIG. 6 is a schematic view of the FIG. 5 arrangement after the obstructor has been moved;
FIG. 7 is an initial state of a groundwater pollution plume;
FIG. 8 is a graph showing the groundwater pollution plume state after 1000 days of remediation and simulation by the conventional pollution extraction process
FIG. 9 is a diagram of the groundwater pollution plume state after 1000 days of remediation by adopting a multidirectional three-dimensional circulation in-situ remediation system process
FIG. 10 is a diagram illustrating the groundwater pollution plume state after 600 days of remediation by adopting a multidirectional three-dimensional circulation in-situ remediation system process
FIG. 11 is a 40% efficiency comparison of the reduction in contaminant level in heavily contaminated areas.
In the figure:
10. repairing the well; 11. a sheath screen pipe; 111. a fluid aperture; 12. an injection/extraction tube; 13a, an upper blocker; 13b, a lower barrier; 131. a pressurizing pipe; 132. a pressure pump; 133. a pressure relief valve;
20. a monitoring well; 21. monitoring a sensor;
30. a clay lens body;
40. pollution feather;
50. a water treatment unit;
60. a dispensing unit;
70. a switching device;
80. a control unit.
Detailed Description
The following describes a multi-directional three-dimensional circulation in-situ remediation system in detail with reference to specific embodiments and accompanying drawings.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. Note that, in order to clearly show the structures of the respective members of the embodiments of the present invention, the same reference numerals are used to denote the same parts.
The structural schematic diagram of the multidirectional three-dimensional circulating in-situ remediation system disclosed by the invention is shown in fig. 1, and comprises a remediation well 10 and a monitoring well 20, wherein the remediation well 10 and the monitoring well 20 are vertically and alternately arranged on a site to be remediated; the monitoring well 20 is provided with a monitoring sensor 21, and the repairing well 10 is connected with the water treatment unit 50 and the dispensing unit 60 through a switching device 70. The rehabilitation well 10 is connected with the water treatment unit 50 and the dispensing unit 60 through a switching device 70. The switching means 70 may be arranged to switch the syringe pump and the suction pump on.
The monitoring well 20 monitors the soil characteristic, the groundwater flow field and the pollution plume change data information of the site to be repaired, and the control part 80 controls the groundwater extraction and the repair agent injection of the repair well 10 to be carried out among different wells and in different well screen sections of each well according to the acquired data information, so as to promote the multidirectional three-dimensional circulation of the groundwater and the agent, and realize the efficient removal of the pollution along with the water flow or the full contact reaction of the agent and the pollutant.
Fig. 2 is a schematic layout diagram of the remediation well 10 and the monitoring well 20 according to the invention, wherein the remediation well 10 is in a quincunx layout, and the monitoring well 20 is arranged between three adjacent remediation wells 10, so as to monitor the physicochemical properties of soil/groundwater and the concentration change of pollutants in the area where the remediation well 10 is located in real time, and guide the extraction or injection operation of the remediation well 10.
Fig. 3 is a schematic structural diagram of a rehabilitation well 10 according to the present invention, wherein a jacket screen 11 is disposed on an inner wall of the rehabilitation well 10, an injection/extraction pipe 12 is disposed in the jacket screen 11, and an upper barrier 13a and a lower barrier 13b are disposed between the jacket screen 11 and the injection/extraction pipe 12.
As one aspect of this embodiment, the outer circumferential wall of the sheath screen 11 is provided with fluid holes 111, as shown in fig. 4, which are spaced apart along the length direction of the sheath screen 11; in the embodiment shown in fig. 4, the fluid holes 111 are in a long-strip hole structure with a small gap, the distance between adjacent intervals is not more than 20mm, four rows are equally distributed along the circumference of the jacket screen 11, and the specific arrangement can be flexibly adjusted according to application requirements. It will be appreciated that it is also possible to arrange five rows, six rows, etc. The gap of the fluid hole 111 is 0.3-2mm, and the specific arrangement can be flexibly adjusted according to application requirements.
The outer peripheral wall of the injection/extraction tube 12 is also provided with a through hole; the groundwater containing the contaminant is pumped to the water treatment unit through the fluid hole 111 of the sheath screen 11, the closed space formed by the upper and lower barriers 13a and 13b, and the penetration hole of the injection/extraction pipe 12; the agent flows to the area to be repaired through the through hole of the injection/extraction pipe 12, the closed space formed by the upper barrier 13a and the lower barrier 13b, and the fluid hole 111 of the sheath screen 11 to realize injection.
As another embodiment of the present invention, the upper and lower barriers 13a and 13b are provided with a pressurizing pipe 131, and the pressurizing pipe 131 is connected with a pressurizing pump 132 to pressurize and expand the barriers to seal up and down between the injection/extraction pipe and the sheath screen. As an aspect of the present embodiment, the pressurizing pipe 131 is provided with a relief valve 133 to relieve the upper and lower stoppers 13a and 13b from pressure and reduce the closed space to move the stoppers on the injection/extraction pipe or to lift or lower the injection/extraction pipe together with the stoppers.
As an embodiment of the present invention, the control part 80 is a cloud processing platform, which draws the spatial distribution of the groundwater flow field and the pollution plume according to the soil/groundwater physicochemical properties and pollutant concentration data of different depths acquired by the monitoring sensor 21, and controls the switching device and the power device in combination with the distribution position of the repair well, so that the repair well is connected to the water processing unit or the dispensing unit through the switching device, and the injection or extraction depth of the injection/extraction pipe in the well is changed.
In some embodiments, the control part draws the groundwater flow field according to the received soil/groundwater physicochemical property and pollutant concentration data, and the control part intelligently controls the extraction/injection of the repair well according to the information of the groundwater flow field; the control part simulates the change condition of the pollutants according to the received soil/underground water physicochemical property and pollutant concentration data, draws the spatial distribution of the pollution plume, and intelligently controls the extraction/injection of the remediation well according to the information of the spatial distribution of the pollution plume.
In one aspect of this embodiment, the monitoring sensors 21 monitor permeate flow, water level, pH, DO, conductivity, ORP, target pollutant concentration, and the like. The monitoring sensor can move along the length direction of the monitoring well so as to monitor the soil/underground water physicochemical property and pollutant concentration at different depths.
The control section 80 draws and outputs the ground water flow field using a MODFLOW model such as GMS software according to the inputted permeate flow, water level, pH, DO, conductivity, ORP, target pollutant concentration, and the like. .
The control unit 80 simulates the change of the pollutant according to the input osmotic flow, water level, pH, DO, conductivity, ORP, target pollutant concentration, and the like, and draws the spatial distribution of the pollution plume. Specifically, an MT3DMS model such as GMS software is adopted as a pollutant migration model, the change condition of pollutants is simulated, and the spatial distribution of the pollution plume is drawn.
According to the distribution position of the repair wells and the calculated underground water flow field and the calculated spatial distribution of the pollution plume, the control part 80 adopts a FEMWATER model simulation such as GMS software to output a multidirectional three-dimensional circulation pumping and injecting scheme, wherein the multidirectional three-dimensional circulation pumping and injecting scheme comprises switching, working time, flow and pumping/injecting depth of injection or pumping of the repair wells at upstream and downstream.
And controlling the switching device and the power device to execute the multidirectional three-dimensional circulation pumping scheme, and automatically adjusting the injection or pumping of the repair well.
FIG. 5 is a schematic view of an embodiment of the multi-directional three-dimensional cyclic in situ remediation system of the present invention. In this embodiment, the sealed space formed by the upper and lower stoppers 13a and 13b of the injection/extraction pipe in the rehabilitation well 10a is located at position # c, and the upper and lower stoppers of the injection/extraction pipe in the rehabilitation well 10b are located at position # c. Through the monitoring data of the monitoring sensors of the monitoring well 20, it is found that the soil layer contains clay lenticles 30, and if the traditional extraction/injection in the horizontal direction is adopted, the recovery effect of the extraction/injection can be weakened due to the poor permeability of the clay lenticles.
By inputting monitoring data into a simulation calculation of a control part 80, in order to avoid the obstruction of a clay lens body with poor permeability, the injected and extracted water flow is enabled to run by bypassing the clay lens body with weak permeability, a power device of an injection/extraction pipe is controlled, a sealing space formed by an upper barrier 13a and a lower barrier 13b of the injection/extraction pipe in a repair well 10a is enabled to be lowered to a position of number (c), meanwhile, the sealing space of the upper barrier and the lower barrier of the injection/extraction pipe in the repair well 10b is enabled to be raised to a position of number (c), as shown in figure 6, a switching device is controlled, a medicament is injected into the repair well 10a, underground water is extracted from the repair well 10b, the injected medicament or the extracted water flow avoids the clay lens body with poor permeability as much as possible, the medicament is enabled to be fully contacted with the pollution plume, and the pollution plume 40 passes through most of the pollution plume to realize that the pollution is efficiently removed along with the water flow or the, ensuring the pollution remediation effect.
The effect of the multi-directional three-dimensional circulation in-situ remediation system according to the present invention will be described with reference to fig. 7 to 11.
Benzene pollution exists in groundwater in a certain area, and the highest concentration reaches 90-100 mg/L. The regional stratum is generalized to 3 layers, the upper layer is artificial filling soil, the middle layer is a sand layer, and the bottom layer is a cohesive soil layer. Wherein the sand layer is a water-containing layer, a cohesive soil lens body is clamped at the local part, and the pollution feather is positioned at the middle depth of the water-containing layer.
By arranging the multidirectional three-dimensional circulating well, the three-dimensional circulating extraction strategy is optimized under the condition of maintaining the extraction treatment water quantity unchanged. Compared with the traditional remediation strategy that water pumping is only performed according to the pollution depth of 3-5 meters, the scheme optimizes the three-dimensional pumping depth to be 2-8 meters of the whole aquifer, and simultaneously designs the pumping well or the remediation well as a circulating pumping and injection well, so that the drainage of underground water in the pollution layer is avoided, injected agents or pumped water flow is blocked by a clay lens, the circulation is enhanced, and the remediation effect is improved. Through the simulation comparison of the optimized scheme and the traditional repair strategy, the repair efficiency is improved by more than 3 times, the repair period is shortened by 60 percent, and the multiple advantages of repair efficiency, time efficiency and the like of the repair system are fully embodied.
Compared with the prior art, the multidirectional three-dimensional circulation in-situ remediation system provided by the invention is reasonable in structure, flexibly sets underground water pumping and medicament injection, promotes multidirectional three-dimensional circulation of the underground water and the medicament, realizes efficient removal of pollution along with water flow or full and uniform contact reaction between the medicament and pollutants, improves the utilization rate of the injected medicament, saves the remediation cost and improves the remediation effect.
The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.
Claims (10)
1. The multi-directional three-dimensional circulating in-situ restoration system is characterized by comprising a restoration well and a monitoring well, wherein the restoration well and the monitoring well are vertically and alternately arranged on a site to be restored; the monitoring well is provided with a monitoring sensor, and the repair well is connected with the water extraction unit and the dispensing unit through a switching device.
2. The multi-directional three-dimensional circulation in-situ repair system according to claim 1, wherein a sheath screen is arranged on the inner wall of the repair well, an injection/extraction pipe is arranged in the sheath screen and can move up and down, and an upper blocker and a lower blocker are arranged between the sheath screen and the injection/extraction pipe.
3. The multidirectional three-dimensional circulation in-situ remediation system of claim 1, wherein the outer peripheral wall of the sheath screen is provided with fluid holes spaced along the length of the sheath screen; the peripheral wall of the injection/extraction pipe is also provided with a through hole; pumping underground water containing pollutants to a water treatment unit through a fluid hole of the sheath sieve tube, a closed space formed by the upper barrier and the lower barrier and a through hole of the injection/extraction tube; the medicament flows to the area to be repaired through the through hole of the injection/extraction pipe, the closed space formed by the upper baffle and the lower baffle and the fluid hole of the sheath screen pipe to realize injection.
4. The multidirectional stereoscopic circulation in-situ remediation system of claim 3 wherein the upper and lower barriers are provided with a pressurization pipe connected to a pressurization pump for pressurizing expansion of the barriers to seal the injection/extraction pipe to the screen of the sheath up and down.
5. The multidirectional three-dimensional circulation in-situ remediation system of claim 4, wherein the pressurization pipe is provided with a pressure relief valve to reduce pressure relief of the upper and lower barriers to relieve the confined space.
6. The multidirectional stereoscopic circulation in-situ remediation system of any one of claims 2 to 5 wherein an injection/extraction pipe is driven by power means to move up and down within the jacketed screen.
7. The multidirectional stereoscopic circulation in-situ remediation system of claim 6 further comprising a control portion communicatively coupled to the monitoring sensor, the switching device, and the motive device.
8. The multidirectional stereoscopic circulation in-situ remediation system of claim 7 wherein the monitoring sensor is movable along the length of the monitoring well to monitor soil/groundwater physicochemical properties and contaminant concentrations at different heights.
9. The system according to claim 7, wherein the control part is a cloud processing platform, which maps the spatial distribution of the groundwater flow field and the pollution plume according to the soil/groundwater physicochemical properties and pollutant concentration data at different depths acquired by the monitoring sensors, and combines the distribution positions of the remediation wells to control the switching device and/or the power device.
10. The multidirectional stereoscopic circulation in situ remediation system of claim 9 wherein the soil/groundwater physicochemical properties and contaminant concentration data include permeate flow, water level, pH, conductivity, ORP, DO, target contaminant concentration.
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| CN113311133A (en) * | 2021-06-23 | 2021-08-27 | 成都理工大学 | Test method for repairing heterogeneous soil groundwater |
| CN113532940A (en) * | 2021-06-23 | 2021-10-22 | 成都理工大学 | Multifunctional test testing equipment for repairing heterogeneous soil groundwater |
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| CN114570759A (en) * | 2022-03-09 | 2022-06-03 | 广东工业大学 | Soil remediation control method and system based on heat-assisted in-situ chemical oxidation |
| CN114632368A (en) * | 2022-04-22 | 2022-06-17 | 中国地质调查局水文地质环境地质调查中心 | Blockage removing and resistance breaking method for multi-filter-layer circulating well in organic pollution site |
| CN114632368B (en) * | 2022-04-22 | 2024-04-26 | 中国地质调查局水文地质环境地质调查中心 | Method for removing blockage and breaking blockage of multi-filter-layer circulating well in organic pollution site |
| CN115228916A (en) * | 2022-07-27 | 2022-10-25 | 江苏维诗环境科技有限公司 | Integrated repair system for strengthening soil vapor extraction and groundwater remediation |
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| CN115784417A (en) * | 2023-02-17 | 2023-03-14 | 宝航环境修复有限公司 | Method for repairing underground water polluted by volatile phenol through in-situ ozone oxidation |
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