An apparatus for simulating remediation of organic volatile pollution in groundwater and a method of using the same

Abstract

The application discloses a kind of organic volatile pollution remediation simulation devices containing groundwater and application method thereof, and the simulation device for remediation includes experimental box, groundwater layer arranged in the bottom of experimental box, soil arranged above water-permeable plate, waterproof monitoring unit arranged in one side of experimental box, integrated unit arranged in the top of experimental box, steam dosing unit arranged in integrated unit, first gas phase extraction unit and liquid phase extraction unit arranged in integrated unit and arranged in soil;The simulation of extraction remediation technology can be effectively carried out by the setting of integrated unit, and the gas phase, liquid phase and steam dosing in the remediation technology are effectively connected;By the setting of waterproof monitoring unit, the groundwater is blocked, and the simulation of effective change of groundwater level is guaranteed;By the simulation setting of remediation technology, the actual extraction technology in experimental box is effectively guaranteed, and the remediation technology is effectively evaluated.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of groundwater pollution remediation experiment simulation, and particularly relates to a groundwater-containing organic volatile pollution remediation simulation device and an application method thereof. BACKGROUND

[0002] Groundwater pollution has strong concealment, and once groundwater pollution occurs, a long remediation process is required. During the remediation process, fluctuations in the groundwater level may occur due to runoff or precipitation replenishment, and the fluctuating groundwater may affect the migration of pollutants. In order to ensure better remediation of groundwater pollution, it is necessary to simulate the fluctuations in the groundwater level and the changes in the pollution plume in a targeted manner to ensure the effective implementation of remediation technologies. How to better simulate the removal of pollutants from the groundwater and the soil by the volatile organic pollutants under the conditions of water level fluctuation migration, gas-liquid two-phase extraction, and synergistic volatilization remediation technologies, so as to better evaluate the remediation technology effect, requires the design of a targeted simulation device and application method. SUMMARY

[0003] The present application provides a groundwater-containing organic volatile pollution remediation simulation device and an application method thereof to solve the technical problems of water level change simulation, pollutant migration simulation, and extraction remediation technology simulation in an experimental device under the condition of groundwater level fluctuation of organic volatile pollutants.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A groundwater-containing organic volatile pollution remediation simulation device, comprising an experimental box body, a groundwater layer arranged at the bottom of the experimental box body, a water supply tank arranged outside the experimental box body, a water supply pipeline connected between the water supply tank and the groundwater layer, a water-permeable plate arranged inside the experimental box body and above the groundwater layer, a soil arranged above the water-permeable plate, a waterproof monitoring unit arranged at one side of the experimental box body, an integrated unit arranged at the top of the experimental box body, a steam dosing unit arranged in the integrated unit, a first gas-phase extraction unit arranged in the integrated unit and arranged in the soil, a liquid-phase extraction unit arranged in the integrated unit and arranged in the groundwater layer, and a cover plate unit detachably connected to the top of the integrated unit.

[0006] The groundwater layer is a fluctuating water layer; the pollution plume is distributed in the soil and the groundwater layer.

[0007] The waterproof monitoring unit comprises a waterproof wall plate, a monitoring plug plate detachably connected to the waterproof wall plate, a monitoring pipe pre-buried in the monitoring plug plate, monitoring sensors arranged at intervals in the height direction of the monitoring pipe, and sensor connecting lines connected to the monitoring sensors; wherein the monitoring sensors extend into the soil; a baffle is arranged at the bottom of the experimental box body, and the baffle and the side wall of the experimental box body sandwich the waterproof monitoring unit.

[0008] The integrated unit comprises a strip-shaped integrated carrier plate, integrated sleeves connected to the integrated carrier plate, and integrated clamping plates arranged at both ends of the integrated carrier plate; the integrated clamping plates are inserted into the top of the side wall of the experimental box; the number of integrated sleeves is respectively corresponding to the number of steam dosing units, first gas phase extraction units, liquid phase extraction units and pollution addition points.

[0009] The water permeable plate is further fixedly connected with a lower pipe connecting piece on the side close to the water-resisting monitoring unit, and the lower pipe connecting piece is detachably connected with a liquid phase extraction upper pipe and a liquid phase extraction lower pipe in the liquid phase extraction unit; the liquid phase extraction upper pipe is inserted into the integrated sleeve, and the liquid phase extraction lower pipe is arranged in the underground water layer.

[0010] Further, the experimental box is a rectangular box with an upper opening and is made of transparent material, and the water permeable plate is fixedly connected in the lower part of the experimental box; the diameter of the water permeable hole on the water permeable plate is not greater than the particle size of the soil above;

[0011] The baffle in the experimental box is a long strip-shaped plate, and the baffle is fixedly connected with the experimental box.

[0012] The experimental box is provided with a water inlet and a water outlet on the side away from the water-resisting monitoring unit, the water inlet is arranged above the water outlet, and the water inlet is connected with a water supply tank through a water supply pipeline; a water pump is further arranged on the water supply pipeline.

[0013] Valves are arranged on the water inlet, the water outlet and the water supply pipeline.

[0014] Further, the cover plate unit comprises a cover main plate, a cover plate groove arranged on the bottom surface of the cover main plate, and a cover plate hole arranged in the cover plate groove.

[0015] The cover main plate is a rectangular plate, and the length and width of the cover main plate are corresponding to the length and width of the upper opening of the experimental box; the thickness of the cover main plate is greater than the thickness of the integrated carrier plate.

[0016] The cover plate groove is arranged corresponding to the clamping of the integrated carrier plate, and the cover plate hole is arranged corresponding to the penetration of the integrated sleeve.

[0017] Further, the integrated carrier plate is a long strip-shaped rectangular plate, and the integrated sleeve is fixedly connected to the integrated carrier plate, and the top of the integrated sleeve penetrates through the cover plate hole.

[0018] The integrated clamping plate is formed by two parallel plates, and the gap width between the two parallel plates is corresponding to the wall thickness of the experimental box.

[0019] Further, the steam dosing unit comprises a steam dosing device, a steam dosing connecting pipe connected with the steam dosing device, and a steam dosing insertion pipe detachably connected to the end of the steam dosing connecting pipe.

[0020] The steam medicine inserting pipe comprises a main pipe and a pipe top plate connected to the top of the main pipe and in the shape of a ring, the main pipe is inserted into the integrated sleeve, and the bottom of the main pipe extends out of the integrated sleeve and into the soil; the wall of the main pipe extending into the soil is provided with air outlet holes; and the pipe top plate is lapped on the top of the integrated sleeve.

[0021] Further, the first gas phase extraction unit comprises a first gas phase collection vehicle, a first gas phase pipeline connected to the first gas phase collection vehicle, an air extraction pump arranged on the first gas phase pipeline, a first gas phase sleeve connector arranged at the end of the first gas phase pipeline, and a first gas phase extraction pipe detachably connected below the first gas phase sleeve connector;

[0022] The first gas phase extraction pipe is inserted into the integrated sleeve, and the bottom of the first gas phase extraction pipe extends into the pollution plume range; the wall of the first gas phase extraction pipe is provided with air extraction holes at intervals;

[0023] The first gas phase pipeline is further provided with a gas phase pipeline branch connector, and the gas phase pipeline branch connector is connected to the second gas phase extraction unit;

[0024] The first gas phase sleeve connector is a sleeve, and one side of the sleeve is provided with a sampling pipe.

[0025] Further, the liquid phase extraction unit comprises a liquid phase collection chamber, a liquid phase pipeline connected to the liquid phase collection chamber, a liquid phase water extraction pump arranged on the liquid phase pipeline, a liquid phase sleeve connector connected to the end of the liquid phase pipeline, a liquid phase extraction upper pipe detachably connected to the liquid phase sleeve connector, a lower pipe connector fixed to the water permeable plate and connected to the bottom of the liquid phase extraction upper pipe, and a liquid phase extraction lower pipe detachably connected below the lower pipe connector;

[0026] The lower pipe connector is a sleeve, which is integrally and fixedly connected with the water permeable plate;

[0027] The wall of the liquid phase extraction lower pipe is provided with water extraction holes.

[0028] Further, the liquid phase extraction upper pipe comprises an upper main pipe, an upper pipe bottom plug arranged at the bottom of the upper main pipe, and an upper pipe stopper arranged at the top of the upper pipe bottom plug;

[0029] The upper pipe bottom plug is correspondingly inserted into the lower pipe connector, and the upper pipe stopper is a sealing ring gasket;

[0030] 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 water extraction holes within the range of water level fluctuation;

[0031] The upper pipe stopper seals the gap between the upper main pipe and the integrated sleeve.

[0032] Further, the second gas-phase extraction unit comprises a second gas-phase connecting pipe, a second gas-phase sleeve connector connected to the end of the second gas-phase connecting pipe, and a second gas-phase extraction pipe detachably connected to the second gas-phase sleeve connector.

[0033] The second gas-phase connecting pipe is detachably connected to the gas-phase pipeline branch joint, and the second gas-phase extraction pipe is correspondingly inserted into the integrated sleeve, which is a sleeve added by the pollution source; the second gas-phase extraction pipe is provided with gas extraction holes at intervals on the wall thereof.

[0034] The second gas-phase sleeve connector is a sleeve, and one side of the sleeve is provided with a sampling pipe.

[0035] Further, the application method of the organic volatile pollution remediation simulation device containing underground water comprises the following specific steps:

[0036] Step one: an experimental box body with an upper opening is made, and a sampling port is arranged on the front or back of the box body; the water permeable plate and the baffle are made and installed together when the box body is installed; a liquid extraction lower pipe connecting piece and a liquid-phase extraction lower pipe are pre-installed on one side of the water permeable plate;

[0037] Step two: a space for installing a water isolation monitoring unit is reserved on one side of the liquid-phase extraction lower pipe installed on the water permeable plate; the monitoring plug-in plate in the water isolation monitoring unit is detachably connected, and is adaptively adjusted according to the monitored range and height of the underground water, and the monitoring pipe and the monitoring sensor in the monitoring plug-in plate are also adaptively adjusted according to the monitored range, height and point of the underground water;

[0038] Step three: an integrated unit is installed on the top of the experimental box body, and integrated sleeves are correspondingly arranged according to the number of steam dosing insertion pipes, first gas-phase extraction pipes, liquid-phase extraction upper pipes and pollution adding points; the length of the integrated sleeve corresponding to the pollution adding point is adapted to reach the adding point, and the integrated sleeve corresponding to the liquid-phase extraction upper pipe is directly fixedly connected to the lower pipe connecting piece;

[0039] The length of the integrated sleeve corresponding to the steam dosing insertion pipe is not greater than half of the length of the steam dosing insertion pipe and is adapted to the design operation length of the gas outlet hole of the steam dosing insertion pipe;

[0040] The length of the integrated sleeve corresponding to the first gas-phase extraction pipe is not greater than half of the length of the first gas-phase extraction pipe and is adapted to the design operation length of the gas extraction hole of the first gas-phase extraction pipe;

[0041] Step four: a water supply tank is connected to the bottom of the experimental box body to form an underground water layer; then the soil is filled according to the generalized soil layer, and finally a cover plate unit is installed; the steam dosing insertion pipe, the first gas-phase extraction pipe and the liquid-phase extraction upper pipe are correspondingly installed in the integrated sleeve, and then steam dosing units, first gas-phase extraction units and liquid-phase extraction units are respectively connected to form the steam dosing units, the first gas-phase extraction units and the liquid-phase extraction units;

[0042] Step five, the integrated sleeve corresponding to the added pollutants is added with volatile organic pollutants, and then a second gas phase extraction pipe is inserted into the integrated sleeve, and is connected to form a second gas phase extraction unit; then the second gas phase connecting pipe in the second gas phase extraction unit is detachably connected with the gas phase pipeline branch joint in the first gas phase extraction unit;

[0043] Step six, according to the set pollutant migration time, water level fluctuation frequency and fluctuation time, the pollutants are allowed to migrate to form a pollution plume, and sampling and analysis are performed according to the sampling port; when the pollution plume reaches the groundwater layer and meets the design, the first gas phase extraction unit, the second gas phase extraction unit and the liquid phase extraction unit are used in an intermittent extraction mode, and the intermittent space is used to increase the volatility of the pollutants in the soil by the steam dosing unit;

[0044] Step seven, the groundwater level in the soil is raised by the water supply tank, or the water level in the soil is lowered by connecting the water outlet with the drainage tank; during the water level fluctuation in the soil, the fluctuation water level is ensured to meet the design by the water-resisting monitoring unit; and according to the water level after the fluctuation is stabilized, the main pipe is lifted upwards, and the soil liquid extraction is performed through the soil liquid extraction hole at the bottom of the corresponding integrated sleeve; the steam dosing insertion pipe, the first gas phase extraction pipe and the second gas phase extraction pipe are also lifted upwards according to the stabilized water level, and the bottom elevations are all higher than the water level after the fluctuation, so as to ensure the gas phase extraction efficiency;

[0045] Step eight, the contents of the pollutants before and after the water level fluctuation at each point in the soil and the groundwater layer are determined through the first gas phase sleeve joint, the second gas phase sleeve joint, the liquid phase sleeve joint and the sampling port, and the extraction is stopped when the content of the pollutants is less than the extraction construction standard; thus, the simulation experiment of the organic volatile pollution repair of the groundwater is completed.

[0046] The beneficial effects of the present application are as follows:

[0047] 1) The integrated unit provided by the present application can effectively simulate the extraction repair technology, and effectively connect the gas phase, liquid phase and steam dosing pipes in the repair technology; and the integrated sleeve can also be used for both adding pollutants and gas phase extraction, which not only ensures the accuracy of adding pollutants, but also saves the extraction points;

[0048] 2) The water-resisting monitoring unit provided by the present application not only simulates the water-resisting wall to block the groundwater, but also ensures the simulation of the change of the groundwater level, which provides support for the subsequent setting of the liquid phase extraction; and the detachable connection of the monitoring plugboard is convenient for adapting to different experimental conditions and convenient use;

[0049] 3) The present application effectively ensures the realization of the actual extraction technology in the experimental box by the simulation setting of the steam dosing unit, the first gas phase extraction unit, the liquid phase extraction unit and the second gas phase extraction unit, which is beneficial to the effective evaluation of the remediation technology;

[0050] 4) The present application is convenient for sampling before, during and after the water level fluctuation by the setting of the first gas phase adapter, the second gas phase adapter, the liquid phase adapter and the sampling port, which is beneficial to the collection and description of the migration condition and the pollution content of the pollution plume, and is convenient for analyzing the migration rule of the pollutants and providing strong support for the remediation technology evaluation.

[0051] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application; the main purpose and other advantages of the present application can be achieved and obtained through the schemes specifically pointed out in the description. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 is the application diagram of the organic volatile pollution remediation simulation device of the underground water without adding pollutants;

[0053] Figure 2 is the application diagram of the organic volatile pollution remediation simulation device of the underground water with adding pollutants;

[0054] Figure 3 is the distribution diagram of the sampling port on the experimental box;

[0055] Figure 4 is the side view of the integrated unit and the cover plate unit connection;

[0056] Figure 5 is the top view of the integrated unit;

[0057] Figure 6 is the structure schematic diagram of the cover plate unit;

[0058] Figure 7 is the top view of the water isolation monitoring unit;

[0059] Figure 8 is the side view of the water isolation monitoring unit;

[0060] Figure 9 is the structure schematic diagram of the steam dosing unit;

[0061] Figure 10 is the structure schematic diagram of the steam dosing cannula;

[0062] Figure 11 is the structure schematic diagram of the first gas phase extraction unit;

[0063] Figure 12Figure 1 is a schematic diagram of a first gas phase extraction pipe structure;

[0064] Figure 13 Figure 2 is a schematic diagram of a first gas phase adapter and its connection structure;

[0065] Figure 14 Figure 3 is a schematic diagram of a liquid phase extraction unit structure;

[0066] Figure 15 Figure 4 is a schematic diagram of a liquid phase extraction upper pipe and liquid phase extraction lower pipe connection structure;

[0067] Figure 16 Figure 5 is a schematic diagram of a liquid phase adapter and its connection structure;

[0068] Figure 17 Figure 6 is a schematic diagram of a second gas phase extraction unit structure;

[0069] Figure 18 Figure 7 is a schematic diagram of a second gas phase extraction pipe structure;

[0070] Figure 19 Figure 8 is a schematic diagram of a second gas phase adapter and its connection structure;

[0071] Figure 20 Figure 9 is an application diagram of a water level fluctuation post-repair simulation device;

[0072] Figure 21 Figure 10 is a schematic diagram of an upper main pipe post-lifting connection.

[0073] : 1 - experimental box, 2 - groundwater layer, 3 - water supply tank, 4 - water supply pipeline, 5 - water pump, 6 - water inlet, 7 - water outlet, 8 - water permeable plate, 9 - soil body, 10 - pollution plume, 11 - baffle, 12 - waterproof monitoring unit, 121 - waterproof wall plate, 122 - monitoring plug plate, 123 - monitoring pipe, 124 - monitoring sensor, 125 - sensor connecting line, 13 - integrated unit, 131 - integrated plug plate, 132 - integrated sleeve, 133 - integrated clamp plate, 14 - steam dosing unit, 141 - steam dosing device, 142 - steam dosing connecting pipe, 143 - steam dosing plug pipe, 1431 - main plug pipe, 1432 - plug 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 joint, 155 - first gas phase sleeve fitting, 156 - first gas phase extraction pipe, 16 - liquid phase extraction unit, 161 - liquid phase collection chamber, 162 - liquid phase pipeline, 163 - liquid phase water pump, 164 - liquid phase sleeve fitting, 165 - liquid phase extraction upper pipe, 1651 - main upper pipe, 1652 - upper pipe stopper, 1653 - upper pipe bottom plug, 166 - liquid phase extraction lower pipe, 167 - lower pipe connecting piece, 17 - cover plate unit, 171 - main cover plate, 172 - cover plate groove, 173 - cover plate hole, 18 - sampling port, 19 - second gas phase extraction unit, 191 - second gas phase connecting pipe, 192 - second gas phase sleeve fitting, 193 - second gas phase extraction pipe, 20 - post-fluctuation water level line, 21 - valve. DETAILED DESCRIPTION

[0074] The soil body of the experiment is sand, and the pollutant is petroleum, which contains various benzene series. The benzene series is a volatile organic pollutant. In order to clarify the change of the pollution plume in the fluctuation of the groundwater level and the influence on the repair effect of the extraction technology, a simulation experiment is carried out by using the organic volatile pollution repair simulation device with groundwater. Figures 1 to 21

[0075] ​In the embodiment, the organic volatile pollution remediation simulation device containing groundwater comprises an experimental box 1, a groundwater layer 2 arranged at the bottom of the experimental box 1, a water supply tank 3 arranged outside the experimental box 1, a water supply pipeline 4 connected between the water supply tank 3 and the groundwater layer 2, a water permeable plate 8 arranged in the experimental box 1 and above the groundwater layer 2, a soil body 9 arranged above the water permeable plate 8, a water isolation monitoring unit 12 arranged at one side of the experimental box 1, an integrated unit 13 arranged at the top of the experimental box 1, a steam dosing unit 14 arranged in the integrated unit 13, a first gas phase extraction unit 15 arranged in the integrated unit 13 and arranged in the soil body 9, a liquid phase extraction unit 16 arranged in the integrated unit 13 and arranged in 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 fluctuation range is set to 10-25 cm; and a pollution plume 10 is distributed in the soil body 9 and the groundwater layer 2.

[0076] In the embodiment, the experimental box 1 is a rectangular box with an open top and is made of organic glass, the connecting parts are connected by structural glue, and the water permeable plate 8 is fixedly connected to the lower part of the experimental box 1; the water permeable holes on the water permeable plate 8 have a diameter not greater than the particle size of the soil body 9 above; and the water permeable plate 8 is integrally made of organic glass of the same material as the experimental box 1. The baffle 11 in the experimental box 1 is a long strip-shaped plate, and the baffle 11 is fixedly connected to the experimental box 1; wherein the baffle 11 is integrally made of organic glass of the same material as the experimental box 1.

[0077] In the embodiment, the experimental box 1 is provided with a water inlet 6 and a water outlet 7 on the side away from the water isolation monitoring unit 12, the water inlet 6 is arranged above the water outlet 7, and the water inlet 6 is connected to the water supply tank 3 through the water supply pipeline 4; valves 21 are arranged on the water inlet 6, the water outlet 7 and the water supply pipeline 4. A water pump 5 is further arranged on the water supply pipeline 4.

[0078] In the embodiment, the cover plate unit 17 comprises a cover main plate 171, a cover plate groove 172 arranged on the bottom surface of the cover main plate 171, and a cover plate hole 173 arranged in the cover plate groove 172; the cover main plate 171 is made of organic glass of the same material as the experimental box 1. The cover main plate 171 is a rectangular plate, and the length and width thereof correspond to the length and width of the open top of the experimental box 1; the thickness of the cover main plate 171 is greater than the thickness of the integrated sleeve 132. The cover plate groove 172 is arranged in correspondence with the clamping of the integrated sleeve 132, and the cover plate hole 173 is arranged in correspondence with the penetration of the integrated sleeve 132.

[0079] In the embodiment, the integrated unit 13 comprises a strip-shaped integrated carrier plate 131, an integrated sleeve 132 connected to the integrated carrier plate 131, and integrated clamping plates 133 arranged at both ends of the integrated carrier plate 131; the integrated clamping plates 133 are inserted into the top of the side wall of the experimental box 1; wherein the integrated carrier plate 131 is a long strip-shaped rectangular plate, the integrated sleeve 132 is fixedly connected to the integrated carrier plate 131, and the top of the integrated sleeve 132 penetrates through the hole 173 of the cover plate; the integrated clamping plates 133 are formed by two parallel plates, and the gap width between the two parallel plates corresponds to the wall thickness of the experimental box 1.

[0080] The number of the integrated sleeves 132 corresponds to the number of the steam dosing units 14, the first gas-phase extraction units 15, the liquid-phase extraction units 16, and the pollution adding points respectively; the integrated carrier plate 131 and the integrated clamping plates 133 are made of the same material as the experimental box 1.

[0081] In the embodiment, the water isolation monitoring unit 12 comprises a water isolation wall plate 121, a monitoring plugboard 122 detachably connected in the water isolation wall plate 121, a monitoring pipe 123 pre-buried in the monitoring plugboard 122, monitoring sensors 124 arranged at intervals in the height direction of the monitoring pipe 123, and sensor wires 125 connected to the monitoring sensors 124; the monitoring sensors 124 extend into the soil body 9; a baffle plate 11 is arranged at the bottom of the experimental box 1, and the water isolation monitoring unit 12 is clamped between the baffle plate 11 and the side wall of the experimental box 1; wherein the water isolation wall plate 121 is made of a glass plate, a plastic plate, or a galvanized steel plate.

[0082] In the embodiment, the steam dosing unit 14 comprises a steam dosing device 141, a steam dosing connecting pipe 142 connected to the steam dosing device 141, and a steam dosing plug pipe 143 detachably connected to the end of the steam dosing connecting pipe 142. The steam dosing plug pipe 143 comprises a plug main pipe 1431 and a plug pipe top plate 1432 connected to the top of the plug main pipe 1431 and in a ring shape, the plug main pipe 1431 is inserted into the integrated sleeve 132, and the bottom of the plug main pipe 1431 extends out of the integrated sleeve 132 and extends into the soil body 9; the pipe wall of the plug main pipe 1431 extending into the soil body 9 is provided with gas outlet holes. Wherein, the plug pipe top plate 1432 overlaps the top of the integrated sleeve 132.

[0083] In the embodiment, the first gas-phase extraction unit 15 comprises a first gas-phase collection vehicle 151, a first gas-phase pipeline 152 connected with the first gas-phase collection vehicle 151, an air extraction pump 153 arranged on the first gas-phase pipeline 152, a first gas-phase sleeve connector 155 arranged at the end of the first gas-phase pipeline 152, and a first gas-phase extraction pipe 156 detachably connected below the first gas-phase sleeve connector 155. The first gas-phase extraction pipe 156 is inserted into the integrated sleeve 132, and the bottom of the first gas-phase extraction pipe 156 extends into the pollution plume 10; air extraction holes are arranged on the wall of the first gas-phase extraction pipe 156 at intervals; the first gas-phase pipeline 152 is further provided with a gas-phase pipeline branch connector 154 connected with the second gas-phase extraction unit 19; the first gas-phase sleeve connector 155 is a sleeve, and a sampling pipe is arranged on one side of the sleeve.

[0084] In the embodiment, the liquid-phase extraction unit 16 comprises a liquid-phase collection chamber 161, a liquid-phase pipeline 162 connected with the liquid-phase collection chamber 161, a liquid-phase water extraction pump 163 arranged on the liquid-phase pipeline 162, a liquid-phase sleeve connector 164 connected at the end of the liquid-phase pipeline 162, a liquid-phase extraction upper pipe 165 detachably connected with the liquid-phase sleeve connector 164, a lower pipe connecting piece 167 connected at the bottom of the liquid-phase extraction upper pipe 165 and fixed on the water-permeable plate 8, and a liquid-phase extraction lower pipe 166 detachably connected below the lower pipe connecting piece 167; the lower pipe connecting piece 167 is a sleeve integrally and fixedly connected with the water-permeable plate 8; water extraction holes are arranged on the wall of the liquid-phase extraction lower pipe 166.

[0085] In the embodiment, the liquid-phase extraction upper pipe 165 comprises an upper main pipe 1651, an upper pipe bottom plug 1653 arranged at the bottom of the upper main pipe 1651, and an upper pipe stopper 1652 arranged at the top of the upper pipe bottom plug 1653; the upper pipe bottom plug 1653 is inserted into the lower pipe connecting piece 167, and the upper pipe stopper 1652 is a sealing annular gasket; the upper main pipe 1651 is a closed sleeve that can be spliced or telescoped, and is inserted into the corresponding integrated sleeve 132; water extraction holes are arranged at the bottom of the corresponding integrated sleeve 132 within the range of water level fluctuation; and the upper pipe stopper 1652 seals the gap between the upper main pipe 1651 and the integrated sleeve 132.

[0086] In the embodiment, the second gas-phase extraction unit 19 comprises a second gas-phase connecting pipe 191, a second gas-phase sleeve connector 192 connected at the end of the second gas-phase connecting pipe 191, and a second gas-phase extraction pipe 193 detachably connected with the second gas-phase sleeve connector 192; the second gas-phase connecting pipe 191 is detachably connected with the gas-phase pipeline branch connector 154, and the second gas-phase extraction pipe 193 is inserted into the integrated sleeve 132, which is a sleeve added by the pollution source; air extraction holes are arranged on the wall of the second gas-phase extraction pipe 193 at intervals; and the second gas-phase sleeve connector 192 is a sleeve, and a sampling pipe is arranged on one side of the sleeve.

[0087] Combination Figures 1 to 21 As shown in the application method of the organic volatile pollution remediation simulation device containing groundwater, the specific steps are as follows:

[0088] Step one, make an experimental box 1 with an open top, and set a sampling port 18 on the front or back of the box; the water permeable plate 8 and the baffle 11 are made and installed together when the box is installed; the liquid under-pipe connecting piece 167 and the liquid-phase extraction under-pipe 166 are pre-installed on one side of the water permeable plate 8.

[0089] Step two, reserve space for installing the water-resisting monitoring unit 12 on one side of the water permeable plate 8 where the liquid-phase extraction under-pipe 166 is installed; among them, the monitoring plug-in board 122 in the water-resisting monitoring unit 12 is detachably connected, and is adjusted according to the range and height of the monitored groundwater; and the monitoring pipe 123 and the monitoring sensor 124 in the monitoring plug-in board 122 are also adjusted according to the range, height and point of the monitored groundwater.

[0090] Step three, install the integrated unit 13 on the top of the experimental box 1; the integrated sleeve 132 is correspondingly set according to the number of the steam dosing insertion pipe 143, the first gas-phase extraction pipe 156, the liquid-phase extraction upper pipe 165 and the pollution adding point, wherein the length of the integrated sleeve 132 corresponding to the pollution adding point is adapted to reach the adding point, and the integrated sleeve 132 corresponding to the insertion of the liquid-phase extraction upper pipe 165 is directly fixedly connected with the under-pipe connecting piece 167.

[0091] The length of the integrated sleeve 132 corresponding to the insertion of the steam dosing insertion pipe 143 is not more than half of the length of the steam dosing insertion pipe 143 and is adapted to the design operation length of the gas outlet hole of the steam dosing insertion pipe 143.

[0092] The length of the integrated sleeve 132 corresponding to the insertion of the first gas-phase extraction pipe 156 is not more than half of the length of the first gas-phase extraction pipe 156 and is adapted to the design operation length of the gas extraction hole of the first gas-phase extraction pipe 156.

[0093] Step four, connect the water supply tank 3 at the bottom of the experimental box 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 insertion 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 to form the steam dosing unit 14, the first gas-phase extraction unit 15 and the liquid-phase extraction unit 16, respectively.

[0094] Step five, add volatile organic pollutants to the integrated sleeve 132 corresponding to the pollution adding point, then insert the second gas-phase extraction pipe 193 into the integrated sleeve 132, and connect to form the second gas-phase extraction unit 19; then detachably connect the second gas-phase connecting pipe 191 in the second gas-phase extraction unit 19 with the gas-phase pipe branch joint 154 in the first gas-phase extraction unit 15.

[0095] Step six, according to the set of pollutant migration time, water level fluctuation frequency and fluctuation duration, let the pollutants first migration to form a pollution plume 10, according to the sampling port 18 sampling and analysis; when the pollution plume 10 reaches the groundwater layer 2 and meets the design, the extraction is carried out, wherein the first gas phase extraction unit 15, the second gas phase extraction unit 19 and the liquid phase extraction unit 16 adopt intermittent extraction mode, and the intermittent gap is used to improve the volatility of the pollutants in the soil body 9 by the steam dosing unit 14.

[0096] Step seven, the groundwater level in the soil body 9 is raised by the water supply tank 3, or the water level in the soil body 9 is lowered by connecting the water outlet 7 with the drainage tank; during the fluctuation of the water level in the soil body 9, the fluctuation water level is ensured to meet the design by the water-resisting monitoring unit 12; and according to the water level after the fluctuation is stabilized, the upper main pipe 1651 is lifted upwards, and the corresponding bottom water hole of the integrated sleeve 132 carries out liquid extraction in the soil body 9. The steam dosing insertion tube 143, the first gas phase extraction pipe 156 and the second gas phase extraction pipe 193 are also lifted upwards according to the stabilized water level, and the bottom elevations are all higher than the water level line 20 after the fluctuation, so as to ensure the gas phase extraction efficiency.

[0097] Step eight, the contents of the pollutants in the soil body 9 and the groundwater layer 2 before and after the water level fluctuation of each point are determined by the first gas phase sleeve joint 155, the second gas phase sleeve joint 192, the liquid phase sleeve joint 164 and the sampling port 18 sampling, until the content of the pollutants is less than the extraction construction standard, the extraction is stopped; thus, the simulation experiment of the organic volatile pollution repair containing groundwater is completed.

[0098] The above only describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this, any changes or replacements thought by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application.

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. 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; 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. 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.

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. A method for applying the groundwater-containing volatile organic pollution remediation simulation device as described in claim 7, 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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