Underground water-containing organic volatilization pollution restoration simulation device and application method thereof

Abstract

The invention discloses an underground water-containing organic volatile pollution remediation simulation device and an application method thereof. The restoration simulation device comprises an experiment box body, an underground water layer arranged at the bottom in the experiment box body, a soil body arranged above a water permeable plate, a water insulation monitoring unit arranged on one side in the experiment box body, an integration unit arranged at the top of the experiment box body and a steam dosing unit arranged in the integration unit. The first gas phase extraction unit and the liquid phase extraction unit are arranged in the integrated unit and in the soil body; according to the invention, through the arrangement of the integrated unit, the simulation of the extraction repair technology can be effectively carried out, and gas-phase, liquid-phase and steam dosing pipes in the repair technology can be effectively connected; through the arrangement of the waterproof monitoring unit, underground water is blocked, and effective simulation of underground water level changes is guaranteed; through simulation setting of a restoration technology, implementation of an actual extraction technology in the experiment box body is effectively ensured, and effective evaluation of the restoration technology is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of experimental simulation technology for groundwater pollution remediation, and specifically relates to a simulation device for the remediation of organic volatile pollution containing groundwater and its application method. Background Technology

[0002] Groundwater pollution is highly concealed, and once it occurs, it requires a lengthy remediation process. During remediation, groundwater levels fluctuate due to runoff or precipitation replenishment, and these fluctuations affect pollutant transport. To ensure better groundwater remediation, it is necessary to specifically simulate groundwater level fluctuations and pollution plume changes to guarantee the effective implementation of remediation technologies. Furthermore, to better simulate the removal effects of volatile organic pollutants on groundwater and soil under fluctuating water levels, using remediation technologies such as gas-liquid two-phase extraction and enhanced volatilization, and to better evaluate the effectiveness of remediation technologies, targeted simulation devices and application methods need to be designed. Summary of the Invention

[0003] This invention provides a simulation device for the remediation of volatile organic pollutants containing groundwater and its application method, which solves technical problems such as simulating water level changes, pollutant migration, and extraction remediation technology in experimental devices under groundwater level fluctuations.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A simulation device for the remediation of volatile organic pollutants containing groundwater includes an experimental chamber, a groundwater layer at the bottom of the experimental chamber, a water supply tank on the outside of the experimental chamber, a water supply pipe connecting the water supply tank and the groundwater layer, a permeable plate inside the experimental chamber and above the groundwater layer, soil above the permeable plate, a water-tight monitoring unit on one side of the experimental chamber, an integrated unit on the top of the experimental chamber, a steam dosing unit inside the integrated unit, a first gas phase extraction unit inside the integrated unit and in the soil, a liquid phase extraction unit inside the integrated unit and in the groundwater layer, and a cover plate unit detachably connected to the top of the integrated unit. The groundwater layer is a wave-like aquifer; the pollution plume is distributed in the soil and the groundwater layer; The water-proof monitoring unit includes a water-proof wall panel, a monitoring insert plate detachably connected to the water-proof wall panel, a monitoring tube pre-embedded in the monitoring insert plate, monitoring sensors spaced apart along the height of the monitoring tube, and sensor wiring connected to the monitoring sensors; wherein, the monitoring sensors extend into the soil; a baffle is provided at the bottom of the experimental chamber, and the water-proof monitoring unit is sandwiched between the baffle and the side wall of the experimental chamber. The integrated unit includes a strip-shaped integrated support plate, an integrated sleeve connected to the integrated support plate, and integrated clamps set at both ends of the integrated support plate; the integrated clamps are inserted into the top of the side wall of the experimental chamber; the number of integrated sleeves is set according to the number of steam dosing units, the first gas phase extraction unit, the liquid phase extraction unit, and the number of pollutant addition points. A lower pipe connector is also fixedly connected to the side of the permeable plate near the water-proof monitoring unit. The lower pipe connector can be detachably connected to the upper liquid extraction pipe and the lower liquid extraction pipe in the liquid extraction unit. The upper liquid extraction pipe is inserted into the integrated sleeve, and the lower liquid extraction pipe is set in the groundwater layer.

[0005] Furthermore, the experimental chamber is a cuboid with an open top and is made of transparent material. A permeable plate is fixedly connected to the lower part of the experimental chamber; the diameter of the permeable holes on the permeable plate is no larger than the particle size of the soil above. The baffle in the experimental chamber is a long strip plate, and the baffle is fixedly connected to the experimental chamber. The experimental chamber has an inlet and an outlet on the side away from the water-proof monitoring unit. The inlet is located above the outlet and is connected to the water supply tank via a water supply pipe. A water pump is also installed on the water supply pipe. Valves are installed at the water inlet, water outlet, and water supply pipe.

[0006] Furthermore, the cover plate unit includes a cover plate main board, a cover plate groove disposed on the bottom surface of the cover plate main board, and a cover plate hole disposed in the cover plate groove; The cover plate is a rectangular plate, and its length and width are set to correspond to the length and width of the opening on the experimental chamber; the thickness of the cover plate is greater than the thickness of the integrated support plate. The groove of the cover plate is designed to be snapped into the integrated support plate, and the hole of the cover plate is designed to be inserted into the integrated sleeve.

[0007] Furthermore, the integrated support plate is a long rectangular plate, and an integrated sleeve is fixedly connected to the integrated support plate, with the top of the integrated sleeve protruding through the cover plate hole; The integrated clamp is composed of two parallel plates, and the gap width between the two parallel plates corresponds to the wall thickness of the experimental chamber.

[0008] Furthermore, the steam dosing unit includes a steam dosing device, a steam dosing connecting pipe connected to the steam dosing device, and a steam dosing insertion tube detachably connected to the end of the steam dosing connecting pipe; The steam dosing tube includes a main tube and a ring-shaped top plate connected to the top of the main tube. The main tube is inserted into the integrated sleeve, and the bottom of the main tube extends out of the integrated sleeve and into the soil. An air vent is provided on the wall of the main tube extending into the soil. The top plate overlaps the top of the integrated sleeve.

[0009] Furthermore, the first gas phase extraction unit includes a first gas phase collection vehicle, a first gas phase pipeline connected to the first gas phase collection vehicle, a vacuum pump installed on the first gas phase pipeline, a first gas phase fitting installed at the end of the first gas phase pipeline, and a first gas phase extraction tube detachably connected to the first gas phase fitting below the first gas phase fitting. The first gas phase extraction tube is inserted into the integrated sleeve, and the bottom of the first gas phase extraction tube extends into the range of the contamination plume; the first gas phase extraction tube has extraction holes spaced apart on its tube wall. The first gas phase pipeline is also equipped with a gas phase pipeline branch joint, which is connected to the second gas phase extraction unit. The first gas phase fitting is a sleeve, and a sampling tube is provided on one side of the sleeve.

[0010] Furthermore, the liquid phase extraction unit includes a liquid phase collection chamber, a liquid phase pipeline connected to the liquid phase collection chamber, a liquid phase pump installed on the liquid phase pipeline, a liquid phase fitting connected to the end of the liquid phase pipeline, a liquid phase extraction upper pipe detachably connected to the liquid phase fitting, a lower pipe connector connected to the bottom of the liquid phase extraction upper pipe and fixed to the permeable plate, and a liquid phase extraction lower pipe detachably connected below the lower pipe connector. The lower pipe connector is a sleeve, which is integrally and fixedly connected to the permeable plate. The liquid phase extraction tube has a water extraction hole on its wall.

[0011] Furthermore, the liquid phase extraction upper tube includes an upper main tube, an upper tube bottom plug disposed at the bottom of the upper main tube, and an upper tube stop disposed at the top of the upper tube bottom plug; The upper tube bottom plug is inserted into the lower tube connector, and the upper tube stop is a sealing ring gasket; The upper main pipe is a closed sleeve, which is inserted into the corresponding integrated sleeve; the bottom of the corresponding integrated sleeve is provided with a pumping hole within the range of water level fluctuation; The upper pipe stop seals the gap between the upper main pipe and the integrated sleeve.

[0012] Furthermore, the second gas phase extraction unit includes a second gas connection pipe, a second gas phase fitting connected to the end of the second gas connection pipe, and a second gas phase extraction pipe detachably connected to the second gas phase fitting. The second gas connection pipe is detachably connected to the gas phase pipeline branch pipe joint, and the second gas phase extraction pipe is correspondingly inserted into the integrated sleeve, which is the sleeve added by the pollution source; the second gas phase extraction pipe has extraction holes spaced apart on its pipe wall. The second gas phase fitting is a sleeve, and a sampling tube is provided on one side of the sleeve.

[0013] Furthermore, the application method of the simulation device for the remediation of volatile organic pollutants containing groundwater includes the following specific steps: Step 1: Fabricate an experimental chamber with an opening at the top, and set a sampling port on the front or back of the chamber; when installing the chamber, fabricate and install the permeable plate and baffle together; pre-install the liquid submersible connector and liquid phase extraction tube on one side of the permeable plate. Step 2: On one side of the liquid phase extraction pipe installed on the permeable plate, space is reserved for installing the water-tight monitoring unit; the monitoring plate in the water-tight monitoring unit is detachable and can be adjusted according to the range and height of the groundwater being monitored, and the monitoring tube and monitoring sensor inside the monitoring plate are also adjusted according to the range, height and location of the groundwater being monitored; Step 3: Install the integrated unit on the top of the experimental chamber. The integrated sleeve is set according to the number of steam dosing pipe, first gas phase extraction pipe, liquid phase extraction upper pipe and contaminant addition point. The length of the integrated sleeve set for the contaminant addition point is adapted to reach the addition point. The integrated sleeve connected to the liquid phase extraction upper pipe is directly fixedly connected to the lower pipe connector. The integrated sleeve corresponding to the steam dosing tube has a length not exceeding half the length of the steam dosing tube and is adapted to the design operating length of the steam dosing tube's vent. The integrated sleeve corresponding to the insertion of the first gas phase extraction tube has a length not greater than half the length of the first gas phase extraction tube and is adapted to the design working length of the extraction port of the first gas phase extraction tube. Step 4: Connect a water supply tank to the bottom of the experimental chamber to form a groundwater layer; then fill the soil according to the generalized soil layer, and finally install the cover plate unit; install the steam dosing pipe, the first gas phase extraction pipe, and the liquid phase extraction upper pipe in the integrated sleeve, and then connect them to form the steam dosing unit, the first gas phase extraction unit, and the liquid phase extraction unit respectively. Step 5: Add volatile organic pollutants to the integrated sleeve corresponding to the pollutant addition, and then insert the second gas phase extraction tube into the integrated sleeve to form the second gas phase extraction unit; then detachably connect the second gas connection tube in the second gas phase extraction unit to the gas phase pipeline branch pipe joint in the first gas phase extraction unit. Step Six: Based on the set pollutant transport time, water level fluctuation frequency and fluctuation duration, allow the pollutants to transport first to form a pollution plume, and sample and analyze it according to the sampling port; when the pollution plume reaches the groundwater layer and meets the design, extraction is carried out. The first gas phase extraction unit, the second gas phase extraction unit and the liquid phase extraction unit adopt an intermittent extraction method. The intermittent gaps are filled with steam dosing unit to improve the volatilization of pollutants in the soil. Step 7: Replenish the groundwater layer through the water supply tank to raise the groundwater level in the soil, or connect the outlet to the drainage pool to lower the groundwater level in the soil; during the fluctuation of the groundwater level, ensure that the fluctuating water level conforms to the design through the water-tight monitoring unit; and raise the upper main pipe upward according to the water level after the fluctuation stabilizes, and extract the liquid in the soil through the corresponding bottom water extraction hole of the integrated sleeve; raise the steam dosing pipe, the first gas phase extraction pipe and the second gas phase extraction pipe upward according to the water level after the stability, and the bottom elevation of both is higher than the water level line after the fluctuation, so as to ensure the gas phase extraction efficiency; Step 8: Using the first gas phase socket, the second gas phase socket, the liquid phase socket, and the sampling port, determine the content of pollutants at various points in the soil and groundwater layer before and after water level fluctuations, until the pollutant content is less than the extraction construction standard, then stop extraction; thus completing the simulation experiment for the remediation of organic volatile pollution in groundwater.

[0014] The beneficial effects of this invention are reflected in: 1) Through the integrated unit, this invention can effectively simulate extraction and remediation technology and effectively connect the gas phase, liquid phase and steam dosing pipes in the remediation technology; and the integrated sleeve can also be used for both pollutant addition and gas phase extraction, which not only ensures the accuracy of pollutant addition but also saves gas phase extraction points. 2) The present invention, through the setting of the water-proof monitoring unit, not only simulates the water-proof wall blocking the groundwater, but also ensures the effective simulation of groundwater level changes, which is conducive to providing support for the subsequent liquid phase extraction setting; and the detachable connection of the monitoring plate is conducive to adapting to different experimental conditions and convenient to use. 3) This invention effectively ensures the realization of actual extraction technology in the experimental chamber by simulating the repair technology through the steam dosing unit, the first gas phase extraction unit, the liquid phase extraction unit, and the second gas phase extraction unit, which is conducive to the effective evaluation of the repair technology. 4) The present invention facilitates sampling throughout the entire process of water level fluctuations, including before, during, and after the fluctuations, by setting up a first gas phase socket, a second gas phase socket, a liquid phase socket, and a sampling port. This allows for comprehensive collection and characterization of the migration status of the pollution plume and the content of pollution, facilitating the analysis of the migration patterns of pollutants and providing strong support for the assessment of remediation technologies.

[0015] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention; the main objects and other advantages of the invention may be realized and obtained by means of the embodiments particularly pointed out in the description. Attached Figure Description

[0016] Figure 1 This is an application diagram of a simulation device for the remediation of volatile organic compound (VOC) pollution in groundwater without added pollutants. Figure 2 This is an application diagram of a simulation device for the remediation of volatile organic pollutants, including those from groundwater. Figure 3 This is a diagram showing the distribution of sampling ports on the experimental chamber; Figure 4 This is a side view showing the connection between the integrated unit and the cover plate unit; Figure 5 This is a top view of the integrated unit; Figure 6 This is a schematic diagram of the cover plate unit structure; Figure 7 This is a top view of the water-tight monitoring unit; Figure 8 This is a side view of the water-proof monitoring unit; Figure 9 This is a schematic diagram of the steam dosing unit structure; Figure 10 This is a schematic diagram of the steam dosing tube structure; Figure 11 This is a schematic diagram of the first gas phase extraction unit; Figure 12 This is a schematic diagram of the first gas phase extraction tube structure; Figure 13 This is a schematic diagram of the first gas phase sleeve and its connection structure; Figure 14 This is a schematic diagram of the liquid phase extraction unit structure; Figure 15 This is a schematic diagram of the connection structure between the upper and lower liquid phase extraction tubes. Figure 16 This is a schematic diagram of the liquid phase sleeve and its connection structure; Figure 17 This is a schematic diagram of the second gas phase extraction unit; Figure 18 This is a schematic diagram of the second gas phase extraction tube structure; Figure 19 This is a schematic diagram of the second gas phase sleeve and its connection structure; Figure 20 This is an application diagram of a water level fluctuation repair simulation device; Figure 21 This is a diagram showing the connections after a manager's promotion.

[0017] Figure reference numerals: 1-Experimental chamber, 2-Groundwater layer, 3-Water supply tank, 4-Water supply pipe, 5-Water pump, 6-Inlet, 7-Outlet, 8-Permeable plate, 9-Soil, 10-Plugging plume, 11-Baffle, 12-Waterproof monitoring unit, 121-Waterproof wall panel, 122-Monitoring insert plate, 123-Monitoring pipe, 124-Monitoring sensor, 125-Sensor connection, 13-Integrated unit, 131-Integrated support plate, 132-Integrated sleeve, 133-Integrated clamp, 14-Steam dosing unit, 141-Steam dosing device, 142-Steam dosing connecting pipe, 143-Steam dosing insert, 1431-Insert main pipe, 1432-Insert pipe top plate, 15-First gas phase extraction unit, 151-First gas phase collection vehicle, 152-First gas phase pipeline 153-Air pump, 154-Gas phase pipeline branch connector, 155-First gas phase socket, 156-First gas phase extraction pipe, 16-Liquid phase extraction unit, 161-Liquid phase collection chamber, 162-Liquid phase pipeline, 163-Liquid phase pump, 164-Liquid phase socket, 165-Liquid phase extraction upper pipe, 1651-Upper main pipe, 1652-Upper pipe stop, 1653-Upper pipe bottom plug, 166-Liquid phase extraction lower pipe, 167-Lower pipe connector, 17-Cover plate unit, 171-Cover plate main plate, 172-Cover plate groove, 173-Cover plate hole, 18-Sampling port, 19-Second gas phase extraction unit, 191-Second gas phase connector, 192-Second gas phase socket, 193-Second gas phase extraction pipe, 20-Water level line after fluctuation, 21-Valve. Detailed Implementation

[0018] The soil used in this experiment was sandy soil, and the pollutant was petroleum. Petroleum contains various benzene compounds, which are volatile organic pollutants. To clarify the changes in the pollution plume during groundwater level fluctuations and their impact on the remediation effect of extraction technology, the following methods were used: Figures 1 to 21 A simulation experiment was conducted using a device to simulate the remediation of volatile organic pollutants containing groundwater.

[0019] In this embodiment, the volatile organic compound remediation simulation device containing groundwater includes an experimental chamber 1, a groundwater layer 2 located at the bottom of the experimental chamber 1, a water supply tank 3 located outside the experimental chamber 1, a water supply pipe 4 connecting the water supply tank 3 and the groundwater layer 2, a permeable plate 8 located inside the experimental chamber 1 and above the groundwater layer 2, soil 9 located above the permeable plate 8, a water-tight monitoring unit 12 located on one side inside the experimental chamber 1, an integrated unit 13 located at the top of the experimental chamber 1, a steam dosing unit 14 located within the integrated unit 13, a first gas phase extraction unit 15 located within the integrated unit 13 and within the soil 9, a liquid phase extraction unit 16 located within the integrated unit 13 and within the groundwater layer 2, and a cover plate unit 17 detachably connected to the top of the integrated unit 13; wherein, the groundwater layer 2 is a fluctuating water layer; the fluctuating range is set to 10-25cm; the pollutant plume 10 is distributed in the soil 9 and the groundwater layer 2.

[0020] In this embodiment, the experimental chamber 1 is a cuboid with an open top and is made of plexiglass. The joints are connected with structural adhesive. A permeable plate 8 is fixedly connected to the lower part of the experimental chamber 1. The diameter of the permeable holes on the permeable plate 8 is no larger than the particle size of the soil 9 above. The permeable plate 8 is integrally made of plexiglass of the same material as the experimental chamber 1. The baffle 11 in the experimental chamber 1 is a long strip plate, and the baffle 11 is fixedly connected to the experimental chamber 1. The baffle 11 is integrally made of plexiglass of the same material as the experimental chamber 1.

[0021] In this embodiment, the experimental chamber 1 has an inlet 6 and an outlet 7 on the side away from the water-proof monitoring unit 12. The inlet 6 is located above the outlet 7 and is connected to the water supply tank 3 through a water supply pipe 4. Valves 21 are installed on the inlet 6, the outlet 7, and the water supply pipe 4. A water pump 5 is also installed on the water supply pipe 4.

[0022] In this embodiment, the cover plate unit 17 includes a cover plate main board 171, a cover plate groove 172 disposed on the bottom surface of the cover plate main board 171, and a cover plate hole 173 disposed in the cover plate groove 172. The cover plate main board 171 is made of plexiglass of the same material as the experimental chamber 1. The cover plate main board 171 is a rectangular plate, and its length and width are set to correspond to the length and width of the opening on the experimental chamber 1. The thickness of the cover plate main board 171 is greater than the thickness of the integrated support plate 131. The cover plate groove 172 is snap-fitted to the integrated support plate 131, and the cover plate hole 173 is for the through-hole of the integrated sleeve 132.

[0023] In this embodiment, the integrated unit 13 includes a strip-shaped integrated support plate 131, an integrated sleeve 132 connected to the integrated support plate 131, and integrated clamping plates 133 disposed at both ends of the integrated support plate 131; the integrated clamping plates 133 are inserted into the top of the side wall of the experimental chamber 1; wherein, the integrated support plate 131 is a long rectangular plate, the integrated sleeve 132 is fixedly connected to the integrated support plate 131, and the top of the integrated sleeve 132 protrudes through the cover plate hole 173; the integrated clamping plate 133 is composed of two parallel plates, and the gap width between the two parallel plates corresponds to the wall thickness of the experimental chamber 1.

[0024] The number of integrated sleeves 132 corresponds to the number of steam dosing unit 14, first gas phase extraction unit 15, liquid phase extraction unit 16 and pollutant addition point, respectively; the integrated support plate 131 and integrated clamping plate 133 are made of the same material as the experimental chamber 1.

[0025] In this embodiment, the water-proof monitoring unit 12 includes a water-proof wall panel 121, a monitoring insert plate 122 detachably connected to the water-proof wall panel 121, a monitoring tube 123 pre-embedded in the monitoring insert plate 122, monitoring sensors 124 spaced apart in the height direction of the monitoring tube 123, and sensor connecting lines 125 connected to the monitoring sensors 124; the monitoring sensors 124 extend into the soil 9; a baffle 11 is provided at the bottom of the experimental chamber 1, and the water-proof monitoring unit 12 is sandwiched between the baffle 11 and the side wall of the experimental chamber 1; wherein, the water-proof wall panel 121 is made of glass plate, plastic plate or galvanized steel plate.

[0026] In this embodiment, the steam dosing unit 14 includes a steam dosing device 141, a steam dosing connecting pipe 142 connected to the steam dosing device 141, and a steam dosing insertion pipe 143 detachably connected to the end of the steam dosing connecting pipe 142. The steam dosing insertion pipe 143 includes a main insertion pipe 1431 and an annular insertion pipe top plate 1432 connected to the top of the main insertion pipe 1431. The main insertion pipe 1431 is inserted into the integrated sleeve 132, and the bottom of the main insertion pipe 1431 extends out of the integrated sleeve 132 and into the soil 9. An air vent is provided on the wall of the main insertion pipe 1431 extending into the soil 9. The insertion pipe top plate 1432 overlaps the top of the integrated sleeve 132.

[0027] In this embodiment, the first gas phase extraction unit 15 includes a first gas phase collection vehicle 151, a first gas phase pipeline 152 connected to the first gas phase collection vehicle 151, a suction pump 153 disposed on the first gas phase pipeline 152, a first gas phase sleeve 155 disposed at the end of the first gas phase pipeline 152, and a first gas phase extraction tube 156 detachably connected to the lower part of the first gas phase sleeve 155. The first gas phase extraction tube 156 is inserted into the integrated sleeve 132, and the bottom of the first gas phase extraction tube 156 extends into the range of the contamination plume 10; suction holes are provided at intervals on the tube wall of the first gas phase extraction tube 156; a gas phase pipeline branch connector 154 is also provided on the first gas phase pipeline 152, and the gas phase pipeline branch connector 154 is connected to the second gas phase extraction unit 19; the first gas phase sleeve 155 is a sleeve, and a sampling tube is disposed on one side of the sleeve.

[0028] In this embodiment, the liquid phase extraction unit 16 includes a liquid phase collection chamber 161, a liquid phase pipeline 162 connected to the liquid phase collection chamber 161, a liquid phase pump 163 installed on the liquid phase pipeline 162, a liquid phase sleeve 164 connected to the end of the liquid phase pipeline 162, a liquid phase extraction upper pipe 165 detachably connected to the liquid phase sleeve 164, a lower pipe connector 167 connected to the bottom of the liquid phase extraction upper pipe 165 and fixed to the permeable plate 8, and a liquid phase extraction lower pipe 166 detachably connected to the lower pipe connector 167 below the lower pipe connector 167; the lower pipe connector 167 is a sleeve, which is integrally fixedly connected to the permeable plate 8; the pipe wall of the liquid phase extraction lower pipe 166 is provided with a water extraction hole.

[0029] In this embodiment, the liquid phase extraction upper tube 165 includes an upper main tube 1651, an upper tube bottom plug 1653 disposed at the bottom of the upper main tube 1651, and an upper tube stop 1652 disposed at the top of the upper tube bottom plug 1653; the upper tube bottom plug 1653 is correspondingly inserted into the lower tube connector 167, and the upper tube stop 1652 is a sealing annular gasket; the upper main tube 1651 is a closed sleeve that can be spliced ​​or extended, and the upper main tube 1651 is inserted into the corresponding integrated sleeve 132; the bottom of the corresponding integrated sleeve 132 is provided with a water extraction hole within the range of water level fluctuation; the upper tube stop 1652 seals the gap between the upper main tube 1651 and the integrated sleeve 132.

[0030] In this embodiment, the second gas phase extraction unit 19 includes a second gas connecting pipe 191, a second gas phase sleeve 192 connected to the end of the second gas connecting pipe 191, and a second gas phase extraction pipe 193 detachably connected to the second gas phase sleeve 192; the second gas connecting pipe 191 is detachably connected to the gas phase pipeline branch pipe joint 154, and the second gas phase extraction pipe 193 is correspondingly inserted into the integrated sleeve 132, which is a sleeve added by the pollution source; the second gas phase extraction pipe 193 has suction holes spaced apart on its pipe wall; the second gas phase sleeve 192 is a sleeve, and a sampling tube is provided on one side of the sleeve.

[0031] Combination Figures 1 to 21 As shown, the application method of the simulation device for remediation of volatile organic pollutants containing groundwater includes the following specific steps: Step 1: Construct an experimental chamber 1 with an opening at the top, and set a sampling port 18 on the front or back of the chamber; when installing the chamber, the permeable plate 8 and the baffle 11 are constructed and installed together; the liquid submersible connector 167 and the liquid phase extraction tube 166 are pre-installed on one side of the permeable plate 8.

[0032] Step 2: On one side of the permeable plate 8, a space is reserved for installing the water-proof monitoring unit 12; wherein, the monitoring plate 122 in the water-proof monitoring unit 12 is detachably connected and can be adjusted according to the monitoring range and height of the groundwater, and the monitoring tube 123 and monitoring sensor 124 inside the monitoring plate 122 are also adjusted according to the monitoring range, height and location of the groundwater.

[0033] Step 3: Install the integrated unit 13 on the top of the experimental chamber 1. The integrated sleeve 132 is set according to the number of steam dosing pipe 143, first gas phase extraction pipe 156, liquid phase extraction upper pipe 165 and pollutant addition points. The length of the integrated sleeve 132 set for the pollutant addition point is adapted to reach the addition point. The integrated sleeve 132 connected to the liquid phase extraction upper pipe 165 is directly fixedly connected to the lower pipe connector 167.

[0034] The integrated sleeve 132 corresponding to the steam dosing tube 143 has a length not greater than half the length of the steam dosing tube 143 and is adapted to the design operating length of the vent of the steam dosing tube 143. The integrated sleeve 132 corresponding to the insertion of the first gas phase extraction tube 156 has a length not greater than half the length of the first gas phase extraction tube 156 and is adapted to the design operating length of the extraction port of the first gas phase extraction tube 156.

[0035] Step 4: Connect the water supply tank 3 to the bottom of the experimental chamber 1 to form the groundwater layer 2; then fill the soil 9 according to the generalized soil layer, and finally install the cover plate unit 17; install the steam dosing pipe 143, the first gas phase extraction pipe 156, and the liquid phase extraction upper pipe 165 in the integrated sleeve 132, and then connect them to form the steam dosing unit 14, the first gas phase extraction unit 15, and the liquid phase extraction unit 16 respectively.

[0036] Step 5: Add volatile organic pollutants to the integrated sleeve 132 corresponding to the pollutant addition, and then insert the second gas phase extraction tube 193 into the integrated sleeve 132 to form the second gas phase extraction unit 19; then detachably connect the second gas connection tube 191 in the second gas phase extraction unit 19 to the gas phase pipeline branch pipe joint 154 in the first gas phase extraction unit 15.

[0037] Step 6: Based on the set pollutant transport time, water level fluctuation frequency and fluctuation duration, allow the pollutants to transport first to form a pollution plume 10, and sample and analyze it through sampling port 18; when the pollution plume 10 reaches the groundwater layer 2 and meets the design, extraction is performed. The first gas phase extraction unit 15, the second gas phase extraction unit 19 and the liquid phase extraction unit 16 adopt an intermittent extraction method. The intermittent gaps are filled by the steam dosing unit 14 to enhance the volatilization of pollutants in the soil 9.

[0038] Step 7: The groundwater level in soil 9 is raised by replenishing the groundwater layer 2 through the water supply tank 3, or the water level in soil 9 is lowered by connecting the outlet 7 to the drainage pool. During the fluctuation of the water level in soil 9, the water-tight monitoring unit 12 ensures that the fluctuating water level conforms to the design. Based on the water level after the fluctuation stabilizes, the upper main pipe 1651 is raised, and the corresponding integrated sleeve 132 bottom water extraction hole is used to extract liquid from soil 9. The steam dosing pipe 143, the first gas phase extraction pipe 156, and the second gas phase extraction pipe 193 are also raised based on the stabilized water level, and the bottom elevation of each is higher than the fluctuating water level line 20 to ensure the gas phase extraction efficiency.

[0039] Step 8: Using the first gas phase socket 155, the second gas phase socket 192, the liquid phase socket 164, and the sampling port 18, the content of pollutants before and after the water level fluctuations at various points in the soil 9 and the groundwater layer 2 is determined. Extraction is stopped when the pollutant content is less than the extraction construction standard. This completes the simulation experiment for the remediation of organic volatile pollution containing groundwater.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A simulation device for the remediation of volatile organic pollutants containing groundwater, characterized in that, It includes an experimental chamber, a groundwater layer located at the bottom of the experimental chamber, a water supply tank located outside the experimental chamber, a water supply pipe connecting the water supply tank and the groundwater layer, a permeable plate located inside the experimental chamber and above the groundwater layer, soil located above the permeable plate, a water-tight monitoring unit located on one side of the experimental chamber, an integrated unit located at the top of the experimental chamber, a steam dosing unit located within the integrated unit, a first gas phase extraction unit located within the integrated unit and in the soil, a liquid phase extraction unit located within the integrated unit and in the groundwater layer, and a cover plate unit detachably connected to the top of the integrated unit. The groundwater layer is a wave-like aquifer; the pollution plume is distributed in the soil and the groundwater layer; The water-proof monitoring unit includes a water-proof wall panel, a monitoring insert plate detachably connected to the water-proof wall panel, a monitoring tube pre-embedded in the monitoring insert plate, monitoring sensors spaced apart along the height of the monitoring tube, and sensor wiring connected to the monitoring sensors; wherein, the monitoring sensors extend into the soil; a baffle is provided at the bottom of the experimental chamber, and the water-proof monitoring unit is sandwiched between the baffle and the side wall of the experimental chamber. The integrated unit includes a strip-shaped integrated support plate, an integrated sleeve connected to the integrated support plate, and integrated clamps set at both ends of the integrated support plate; the integrated clamps are inserted into the top of the side wall of the experimental chamber; the number of integrated sleeves is set according to the number of steam dosing units, the first gas phase extraction unit, the liquid phase extraction unit, and the number of pollutant addition points. A lower pipe connector is also fixedly connected to the side of the permeable plate near the water-proof monitoring unit. The lower pipe connector can be detachably connected to the upper liquid extraction pipe and the lower liquid extraction pipe in the liquid extraction unit. The upper liquid extraction pipe is inserted into the integrated sleeve, and the lower liquid extraction pipe is set in the groundwater layer.

2. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 1, characterized in that, The experimental chamber is a cuboid with an open top and is made of transparent material. A permeable plate is fixedly connected to the lower part of the experimental chamber. The diameter of the permeable holes on the permeable plate is no larger than the particle size of the soil above. The baffle in the experimental chamber is a long strip plate, and the baffle is fixedly connected to the experimental chamber. The experimental chamber has an inlet and an outlet on the side away from the water-proof monitoring unit. The inlet is located above the outlet and is connected to the water supply tank via a water supply pipe. A water pump is also installed on the water supply pipe. Valves are installed at the water inlet, water outlet, and water supply pipe.

3. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 2, characterized in that, The cover plate unit includes a cover plate main board, a cover plate groove disposed on the bottom surface of the cover plate main board, and a cover plate hole disposed in the cover plate groove; The cover plate is a rectangular plate, and its length and width are set to correspond to the length and width of the opening on the experimental chamber; the thickness of the cover plate is greater than the thickness of the integrated support plate. The groove of the cover plate is designed to be snapped into the integrated support plate, and the hole of the cover plate is designed to be inserted into the integrated sleeve.

4. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 3, characterized in that, The integrated support plate is a long rectangular plate, and an integrated sleeve is fixedly connected to the integrated support plate, with the top of the integrated sleeve protruding through the cover plate hole; The integrated clamp is composed of two parallel plates, and the gap width between the two parallel plates corresponds to the wall thickness of the experimental chamber.

5. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 4, characterized in that, The steam dosing unit includes a steam dosing device, a steam dosing connecting pipe connected to the steam dosing device, and a steam dosing insertion tube detachably connected to the end of the steam dosing connecting pipe. The steam dosing tube includes a main tube and a ring-shaped top plate connected to the top of the main tube. The main tube is inserted into the integrated sleeve, and the bottom of the main tube extends out of the integrated sleeve and into the soil. An air vent is provided on the wall of the main tube extending into the soil. The top plate overlaps the top of the integrated sleeve.

6. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 5, characterized in that, The first gas phase extraction unit includes a first gas phase collection vehicle, a first gas phase pipeline connected to the first gas phase collection vehicle, a vacuum pump installed on the first gas phase pipeline, a first gas phase socket installed at the end of the first gas phase pipeline, and a first gas phase extraction tube detachably connected to the bottom of the first gas phase socket. The first gas phase extraction tube is inserted into the integrated sleeve, and the bottom of the first gas phase extraction tube extends into the range of the contamination plume; the first gas phase extraction tube has extraction holes spaced apart on its tube wall. The first gas phase pipeline is also equipped with a gas phase pipeline branch joint, which is connected to the second gas phase extraction unit. The first gas phase fitting is a sleeve, and a sampling tube is provided on one side of the sleeve.

7. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 6, characterized in that, The liquid phase extraction unit includes a liquid phase collection chamber, a liquid phase pipeline connected to the liquid phase collection chamber, a liquid phase pump installed on the liquid phase pipeline, a liquid phase fitting connected to the end of the liquid phase pipeline, a liquid phase extraction upper pipe detachably connected to the liquid phase fitting, a lower pipe connector connected to the bottom of the liquid phase extraction upper pipe and fixed to the permeable plate, and a liquid phase extraction lower pipe detachably connected below the lower pipe connector. The lower pipe connector is a sleeve, which is integrally and fixedly connected to the permeable plate. The liquid phase extraction tube has a water extraction hole on its wall.

8. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 7, characterized in that, The liquid phase extraction upper tube includes an upper main tube, an upper tube bottom plug disposed at the bottom of the upper main tube, and an upper tube stopper disposed at the top of the upper tube bottom plug; The upper tube bottom plug is inserted into the lower tube connector, and the upper tube stop is a sealing ring gasket; The upper main pipe is a closed sleeve, which is inserted into the corresponding integrated sleeve; the bottom of the corresponding integrated sleeve is provided with a pumping hole within the range of water level fluctuation; The upper pipe stop seals the gap between the upper main pipe and the integrated sleeve.

9. The simulated device for remediation of volatile organic pollutants containing groundwater as described in claim 8, characterized in that, The second gas phase extraction unit includes a second gas connection pipe, a second gas phase fitting connected to the end of the second gas connection pipe, and a second gas phase extraction pipe detachably connected to the second gas phase fitting. The second gas connection pipe is detachably connected to the gas phase pipeline branch pipe joint, and the second gas phase extraction pipe is correspondingly inserted into the integrated sleeve, which is the sleeve added by the pollution source; the second gas phase extraction pipe has extraction holes spaced apart on its pipe wall. The second gas phase fitting is a sleeve, and a sampling tube is provided on one side of the sleeve.

10. A method for applying the groundwater-containing volatile organic pollution remediation simulation device as described in claim 9, characterized in that, The specific steps are as follows: Step 1: Fabricate an experimental chamber with an opening at the top, and set a sampling port on the front or back of the chamber; when installing the chamber, fabricate and install the permeable plate and baffle together; pre-install the liquid submersible connector and liquid phase extraction tube on one side of the permeable plate. Step 2: On one side of the liquid phase extraction pipe installed on the permeable plate, space is reserved for installing the water-tight monitoring unit; the monitoring plate in the water-tight monitoring unit is detachable and can be adjusted according to the range and height of the groundwater being monitored, and the monitoring tube and monitoring sensor inside the monitoring plate are also adjusted according to the range, height and location of the groundwater being monitored; Step 3: Install the integrated unit on the top of the experimental chamber. The integrated sleeve is set according to the number of steam dosing pipe, first gas phase extraction pipe, liquid phase extraction upper pipe and contaminant addition point. The length of the integrated sleeve set for the contaminant addition point is adapted to reach the addition point. The integrated sleeve connected to the liquid phase extraction upper pipe is directly fixedly connected to the lower pipe connector. The integrated sleeve corresponding to the steam dosing tube has a length not exceeding half the length of the steam dosing tube and is adapted to the design operating length of the steam dosing tube's vent. The integrated sleeve corresponding to the insertion of the first gas phase extraction tube has a length not greater than half the length of the first gas phase extraction tube and is adapted to the design working length of the extraction port of the first gas phase extraction tube. Step 4: Connect a water supply tank to the bottom of the experimental chamber to form a groundwater layer; then fill the soil according to the generalized soil layer, and finally install the cover plate unit; install the steam dosing pipe, the first gas phase extraction pipe, and the liquid phase extraction upper pipe in the integrated sleeve, and then connect them to form the steam dosing unit, the first gas phase extraction unit, and the liquid phase extraction unit respectively. Step 5: Add volatile organic pollutants to the integrated sleeve corresponding to the pollutant addition, and then insert the second gas phase extraction tube into the integrated sleeve to form the second gas phase extraction unit; then detachably connect the second gas connection tube in the second gas phase extraction unit to the gas phase pipeline branch pipe joint in the first gas phase extraction unit. Step Six: Based on the set pollutant transport time, water level fluctuation frequency and fluctuation duration, allow the pollutants to transport first to form a pollution plume, and sample and analyze it according to the sampling port; when the pollution plume reaches the groundwater layer and meets the design, extraction is carried out. The first gas phase extraction unit, the second gas phase extraction unit and the liquid phase extraction unit adopt an intermittent extraction method. The intermittent gaps are filled with steam dosing unit to improve the volatilization of pollutants in the soil. Step 7: Replenish the groundwater layer through the water supply tank to raise the groundwater level in the soil, or connect the outlet to the drainage pool to lower the groundwater level in the soil; during the fluctuation of the groundwater level, ensure that the fluctuating water level conforms to the design through the water-tight monitoring unit; and raise the upper main pipe upward according to the water level after the fluctuation stabilizes, and extract the liquid in the soil through the corresponding bottom water extraction hole of the integrated sleeve; raise the steam dosing pipe, the first gas phase extraction pipe and the second gas phase extraction pipe upward according to the water level after the stability, and the bottom elevation of both is higher than the water level line after the fluctuation, so as to ensure the gas phase extraction efficiency; Step 8: Using the first gas phase socket, the second gas phase socket, the liquid phase socket, and the sampling port, determine the content of pollutants at various points in the soil and groundwater layer before and after water level fluctuations, until the pollutant content is less than the extraction construction standard, then stop extraction; thus completing the simulation experiment for the remediation of organic volatile pollution in groundwater.

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