Rapid in-situ monitoring system for VOCs pollution in underground water and soil gas of polluted site

Abstract

The invention provides a rapid in-situ monitoring system for VOCs pollution in underground water and soil gas of a polluted site, and belongs to the technical field of environment monitoring. Comprising a first collection module for collecting VOCs samples in underground water, a second collection module for collecting VOCs samples in soil gas, a collection module connected with the first collection module and the second collection module, an analysis monitoring module connected with the collection module, and a central processing module. VOCs samples in underground water are collected through the first collection module, VOCs samples in soil gas are collected through the second collection module, the collected VOCs samples are collected and stored through the collection module, the concentration and components of the VOCs samples in the collection module are monitored through the analysis monitoring module, and the whole system is arranged near a polluted site. And rapid in-situ monitoring of VOCs pollution in underground water and soil gas of a polluted site can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental monitoring, and in particular relates to a rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas at a contaminated site. Background Art

[0002] With the development of economy and urban planning, industrial production activities and the organic pollution sites left behind are one of the important sources of VOCs. Industrial production activities generate VOCs pollutants that enter the human environment. Some VOCs substances enter the soil and groundwater through leakage and unreasonable stacking during transportation and storage. Due to the extensive environmental management in the past, the site has caused considerable pollution.

[0003] By monitoring VOCs in groundwater and soil gas, we can trace the source of pollution, help determine the distribution and migration path of pollutants, and effectively control the spread of pollution. Therefore, there is an urgent need for a monitoring system for VOCs pollution in groundwater and soil gas.

[0004] The existing monitoring systems for VOCs pollution in groundwater and soil gas require a lot of manpower and resources when in use, are costly, and are difficult to adapt to VOCs collection at different depths and environmental conditions, especially in soil gas collection. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention provides a rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas in contaminated sites.

[0006] The technical solution of the present invention is: a rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas in a contaminated site, comprising a first collection module for collecting VOCs samples in groundwater, a second collection module for collecting VOCs samples in soil gas, a collection module connected to the first collection module and the second collection module, an analysis and monitoring module connected to the collection module, and a central processing module;

[0007] The first collection module includes a groundwater well, a collection pipe arranged in the groundwater well, an air bag pump connected to the collection pipe, and a purge and capture instrument connected to the air bag pump; the second collection module includes a soil gas well, a regulating collection component arranged in the soil gas well, and a vacuum sampling box connected to the regulating collection component;

[0008] The collection module comprises a collection body, a partitioning horizontal plate disposed in the collection body and dividing the interior of the collection body into a first collection chamber and a second collection chamber, and a collection mounting frame connected to the side wall of the collection body through a fixing frame, the first collection chamber is connected to the purge and capture instrument, and the second collection chamber is connected to the vacuum sampling box;

[0009] The analysis and monitoring module includes a detection main pipe connected to the first collection chamber and the second collection chamber, a detection branch pipe connected to the detection main pipe, a flow control valve, a PID photoionization detector and a TCD detector connected end to end to the detection branch pipe; the central processing module is electrically connected to the flow control valve, the PID photoionization detector and the TCD detector.

[0010] Furthermore, the adjusting and collecting assembly includes an upper collecting tube with a sealing ring on the outer wall, a lower collecting tube with a drilling fixing head at the bottom, and a plurality of adjusting and collecting tubes distributed between the upper collecting tube and the lower collecting tube from top to bottom. The adjusting and collecting tube at the uppermost end and the upper collecting tube, between two adjacent adjusting and collecting tubes, and between the adjusting and collecting tube at the lowermost end and the lower collecting tube are all threadedly connected through threaded tubes, and the outer walls of the adjusting and collecting tube and the lower collecting tube are provided with a plurality of collecting holes.

[0011] Description: When collecting VOCs in soil gas, place the regulating collection assembly into the soil gas well, and VOCs enter the regulating collection tube and the lower collection tube through each collection hole and flow into the vacuum sampling box from bottom to top. In the above structure, since the regulating collection tube at the uppermost end and the upper collection tube, between two adjacent regulating collection tubes, and between the regulating collection tube at the lowermost end and the lower collection tube are all threadedly connected by threaded tubes, the number of regulating collection tubes and threaded tubes can be freely increased or decreased according to the required collection depth, so that the regulating collection assembly has strong adaptability and can cover the collection of VOCs in soil gas from shallow to deep layers. The collected VOCs data is more reliable and has higher value for environmental monitoring, pollution source analysis and other research.

[0012] Furthermore, the outer walls of the adjusting collection tube and the lower collection tube are both provided with hollow collection covers, and each of the hollow collection covers is provided with a plurality of collection holes.

[0013] Description: A hollow collection cover is set on the outer wall of the regulating collection tube and the lower collection tube, and a number of collection holes are set on each hollow collection cover to increase the rate at which VOCs enter the regulating collection tube and the lower collection tube and improve the VOCs collection efficiency.

[0014] Furthermore, the sealing ring is fixedly connected to the inner wall of the soil gas well, and a filter is provided in the regulating collection tube and the lower collection tube and at the upper end of the corresponding hollow collection cover.

[0015] Note: When collecting VOCs in soil gas wells, the upper end of the soil gas well is sealed with a sealing ring to reduce the gas exchange between soil gas and the outside air. This can effectively prevent surface air from entering the soil gas well and reduce the contamination of the collected samples by the outside air.

[0016] Furthermore, an air inlet and an air outlet are respectively provided on the left and right sides of the vacuum sampling box, and a collection air bag with one end connected to the air inlet is provided in the vacuum sampling box, and a limiting sliding plate which can slide left and right along the inner wall of the vacuum sampling box is provided at the other end of the collection air bag, and a connecting sleeve is provided at the center of the limiting sliding plate near the air outlet, and an automatic opening and closing plate is provided at the air outlet. The side wall of the vacuum sampling box is connected to an air pump, and the air outlet is connected to the second collection chamber.

[0017] Description: The VOCs collected in the soil gas enter the collection air bag through the air inlet. As the VOCs continue to enter, the collection air bag is gradually filled. At this time, the limiting sliding plate on the collection air bag moves in the vacuum sampling box toward the air outlet. At the same time, the vacuum sampling box is pumped into a negative pressure state through the vacuum pump to speed up the speed at which VOCs enter the collection air bag from the soil gas, thereby improving the sampling efficiency. When the connecting sleeve contacts the air outlet, the automatic opening and closing plate at the air outlet automatically opens, and the collected VOCs enter the second collection chamber through the air outlet for collection, which can reduce the direct contact between operators and harmful VOCs and improve the safety of the sampling process.

[0018] Furthermore, an arc-shaped mounting plate is connected in the vacuum sampling box at the upper and lower ends of the air outlet through an electric telescopic rod, a sealing airbag is provided on the inner wall of the arc-shaped mounting plate, and an inflation port is provided on the sealing airbag.

[0019] Description: When the connecting sleeve contacts the air outlet, the extension of the electric telescopic rod drives the arc-shaped mounting plate to approach the joint between the connecting sleeve and the air outlet. When the two arc-shaped mounting plates are buckled, the joint between the connecting sleeve and the air outlet is sealed by the sealing airbag. The sealing airbag can automatically adjust according to the shape of the joint to form a tight seal, effectively preventing VOCs leakage and ensuring the airtightness of the sampling process.

[0020] Furthermore, the PID photoionization detector and the TCD detector are arranged on the collection mounting frame.

[0021] Note: Place the PID photoionization detector and TCD detector on the collection mounting frame to improve the centralization of equipment installation and avoid taking up additional space.

[0022] Furthermore, a first air pressure detector is provided at the connection between the first collecting chamber and the purge-trap instrument, and a second air pressure detector is provided at the connection between the second collecting chamber and the vacuum sampling box.

[0023] Note: The air pressure in the first collection chamber is detected by the first air pressure detector, and the air pressure in the second collection chamber is detected by the second air pressure detector. Through continuous monitoring, it can be ensured that the sampling environment meets the preset conditions, thereby improving the controllability of the sampling process and the reliability of the data.

[0024] Furthermore, the central processing module is electrically connected to an electronic display screen.

[0025] Description: The electronic display screen displays the system's operating status, parameter settings, data collection results and other information in real time, allowing users to intuitively monitor the sampling process and system performance.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] When the system for rapid in-situ monitoring of VOCs pollution in groundwater and soil gas of a contaminated site of the present invention is used, VOCs samples in groundwater are collected by a first collection module, VOCs samples in soil gas are collected by a second collection module, VOCs samples in groundwater and soil gas collected are collected and stored by a collection module, and the concentration and composition of the VOCs samples in the collection module are monitored by an analysis and monitoring module. The entire system is arranged near the contaminated site, and rapid in-situ monitoring of VOCs pollution in groundwater and soil gas of the contaminated site can be achieved, and changes in VOCs in groundwater and soil gas can be monitored in real time. Rapid response to pollution sources can provide pollution dynamic information in a timely manner, which is conducive to early warning and rapid disposal of pollution events. Through automation and integrated design, manpower requirements are reduced, resource utilization efficiency is improved, and it has higher cost-effectiveness.

[0028] When collecting VOCs in soil gas, the regulating collection component is placed in the soil gas well, and VOCs enter the regulating collection tube and the lower collection tube through each collection hole and flow into the vacuum sampling box from bottom to top. In the above structure, since the regulating collection tube at the uppermost end and the upper collection tube, between two adjacent regulating collection tubes, and between the regulating collection tube at the lowermost end and the lower collection tube are all threadedly connected by threaded tubes, the number of regulating collection tubes and threaded tubes can be freely increased or decreased according to the required collection depth, so that the regulating collection component has strong adaptability and can cover the collection of VOCs in soil gas from shallow to deep layers. The collected VOCs data is more reliable and has higher value for environmental monitoring, pollution source analysis and other research;

[0029] The VOCs collected in the soil gas enter the collection air bag through the air inlet. As the VOCs continue to enter, the collection air bag is gradually filled. At this time, the limiting sliding plate on the collection air bag moves in the vacuum sampling box toward the air outlet. At the same time, the vacuum sampling box is pumped into a negative pressure state through the vacuum pump to speed up the speed of VOCs entering the collection air bag from the soil gas, thereby improving the sampling efficiency. When the connecting sleeve contacts the air outlet, the automatic opening and closing plate at the air outlet automatically opens, and the collected VOCs enter the second collection chamber through the air outlet for collection, which can reduce the direct contact between operators and harmful VOCs and improve the safety of the sampling process. By establishing a negative pressure state in the vacuum sampling box, the speed of VOCs entering the collection air bag is accelerated, which significantly improves the sampling efficiency and ensures a rapid response to changes in VOCs in the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the vacuum sampling box when the connecting sleeve of the present invention is not in contact with the gas outlet;

[0032] Figure 3 It is a schematic diagram of the internal structure of the vacuum sampling box when the connecting sleeve of the present invention is in contact with the air outlet;

[0033] Figure 4 It is a schematic diagram of the external structure of the regulating and collecting component of the present invention;

[0034] Figure 5 It is a schematic diagram of the internal structure of the regulating and collecting component of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the analysis and monitoring module of the present invention.

[0036] Among them, 1-first collection module, 10-groundwater well, 11-collection tube, 12-air bag pump, 13-purge capture instrument, 14-first air pressure detector, 15-second air pressure detector, 2-second collection module, 20-soil gas well, 21-adjusting collection component, 210-blocking ring, 211-upper collection tube, 212-lower collection tube, 213-adjusting collection tube, 214-threaded tube, 215-collection hole, 216-hollow collection cover, 217-filter, 22-vacuum sampling box, 220-air inlet, 221-air outlet, 222-collection air bag, 2 23-limit sliding plate, 224-connecting sleeve, 225-automatic opening and closing plate, 226-vacuum pump, 24-electric telescopic rod, 240-arc mounting plate, 241-sealed airbag, 3-collection module, 30-collection body, 31-partition horizontal plate, 310-first collection chamber, 311-second collection chamber, 32-collection mounting frame, 320-fixed frame, 4-analysis and monitoring module, 40-detection main pipe, 41-detection branch pipe, 42-flow control valve, 43-PID photoionization detector, 44-TCD detector, 5-central processing module, 50-electronic display screen. DETAILED DESCRIPTION

[0037] In order to further understand the content of the present invention, the present invention is described in detail by way of examples below.

[0038] Example 1: Figure 1 As shown, the rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of a contaminated site includes a first collection module 1 for collecting VOCs samples in groundwater, a second collection module 2 for collecting VOCs samples in soil gas, a collection module 3 connected to the first collection module 1 and the second collection module 2, an analysis and monitoring module 4 connected to the collection module 3, and a central processing module 5;

[0039] The first collection module 1 includes a groundwater well 10, a collection pipe 11 disposed in the groundwater well 10, an air bag pump 12 connected to the collection pipe 11, and a purge and capture device 13 connected to the air bag pump 12; the second collection module 2 includes a soil gas well 20, a regulating collection component 21 disposed in the soil gas well 20, and a vacuum sampling box 22 connected to the regulating collection component 21, wherein the air bag pump 12 and the purge and capture device 13 both adopt existing technologies;

[0040] The collection module 3 includes a collection body 30, a partitioning transverse plate 31 disposed in the collection body 30 and dividing the interior of the collection body 30 into a first collection chamber 310 and a second collection chamber 311, and a collection mounting frame 32 connected to the side wall of the collection body 30 through a fixing frame 320, the first collection chamber 310 is connected to the purge trap 13, and the second collection chamber 311 is connected to the vacuum sampling box 22;

[0041] like Figure 6As shown, the analysis and monitoring module 4 includes a detection main pipe 40 connected to the first collection chamber 310 and the second collection chamber 311, a detection branch pipe 41 connected to the detection main pipe 40, a flow control valve 42 connected end to end with the detection branch pipe 41, a PID photoionization detector 43 and a TCD detector 44; the central processing module 5 is electrically connected to the flow control valve 42, the PID photoionization detector 43 and the TCD detector 44, wherein the flow control valve 42, the PID photoionization detector 43, the TCD detector 44 and the central processing module 5 all adopt the existing technology;

[0042] like Figure 4 , 5 As shown, the regulating and collecting assembly 21 includes an upper collecting tube 211 with a sealing ring 210 on the outer wall, a lower collecting tube 212 with a drilling fixing head 23 on the bottom, and two regulating and collecting tubes 213 distributed between the upper collecting tube 211 and the lower collecting tube 212 from top to bottom. The regulating and collecting tube 213 at the uppermost end and the upper collecting tube 211, between two adjacent regulating and collecting tubes 213, and between the regulating and collecting tube 213 at the lowermost end and the lower collecting tube 212 are all threadedly connected by threaded tubes 214. The outer walls of the regulating and collecting tube 213 and the lower collecting tube 212 are each provided with 8 collecting holes 215. When collecting VOCs in soil gas, the regulating and collecting assembly 21 is placed in the soil gas well 20, and VOCs pass through each collecting hole. The collecting hole 215 enters the regulating collection tube 213 and the lower collection tube 212 and flows into the vacuum sampling box 22 from bottom to top. In the above structure, since the regulating collection tube 213 at the uppermost end and the upper collection tube 211, the two adjacent regulating collection tubes 213, and the regulating collection tube 213 at the lowermost end and the lower collection tube 212 are all threadedly connected by the threaded tube 214, the number of regulating collection tubes 213 and threaded tubes 214 can be freely increased or decreased according to the required collection depth, so that the regulating collection component 21 has strong adaptability and can cover the collection of VOCs in soil gas from shallow to deep layers. The collected VOCs data is more reliable and has higher value for environmental monitoring, pollution source analysis and other research;

[0043] The outer walls of the regulating collection tube 213 and the lower collection tube 212 are both provided with a hollow collection cover 216, and each hollow collection cover 215 is provided with 8 collection holes 215. The hollow collection cover 216 is provided on the outer walls of the regulating collection tube 213 and the lower collection tube 212, and a plurality of collection holes 215 are provided on each hollow collection cover 215, so as to increase the rate at which VOCs enter the regulating collection tube 213 and the lower collection tube 212, and improve the VOCs collection efficiency;

[0044] The sealing ring 210 is fixedly connected to the inner wall of the soil gas well 20, and a filter screen 217 is provided in the adjusting collection tube 213 and the lower collection tube 212 and at the upper end of the corresponding hollow collection cover 215;

[0045] The plugging ring 210 is fixedly connected to the inner wall of the soil gas well 20, and a filter screen 217 is provided in the adjusting collection tube 213 and the lower collection tube 212 and at the upper end of the corresponding hollow collection cover 215. When collecting VOCs in the soil gas well 20, the upper end of the soil gas well 20 is blocked by the plugging ring 210 to reduce the gas exchange between the soil gas and the outside air, which can effectively prevent the surface air from entering the soil gas well, thereby reducing the pollution of the collected samples by the outside air;

[0046] The PID photoionization detector 43 and the TCD detector 44 are arranged on the collection mounting frame 32, and the PID photoionization detector 43 and the TCD detector 44 are arranged on the collection mounting frame 32 to improve the centralization of equipment installation and avoid occupying additional space, wherein the PID photoionization detector 43 and the TCD detector 44 both adopt the existing technology;

[0047] A first air pressure detector 14 is provided at the connection between the first collection chamber 310 and the purge collector 13, and a second air pressure detector 15 is provided at the connection between the second collection chamber 311 and the vacuum sampling box 22. The air pressure in the first collection chamber 310 is detected by the first air pressure detector 14, and the air pressure in the second collection chamber 311 is detected by the second air pressure detector 15. Through continuous monitoring, it can be ensured that the sampling environment meets the preset conditions, and the controllability of the sampling process and the reliability of the data are improved. The first air pressure detector 14 and the second air pressure detector 15 both adopt the existing technology;

[0048] The central processing module 5 is electrically connected to an electronic display screen 50, which displays the system's working status, parameter settings, data collection results and other information in real time, allowing users to intuitively monitor the sampling process and system performance. The electronic display screen 50 adopts existing technology.

[0049] Example 2: This example describes a method for rapid in-situ monitoring of VOCs pollution in groundwater and soil gas at a contaminated site. The method is based on the rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas at a contaminated site in Example 1, and includes the following steps:

[0050] S1. Collection of VOCs samples in groundwater

[0051] The collecting tube 11 is placed in the groundwater well 10, and the groundwater is pumped into the purge trap 13 by the airbag pump 12. The groundwater sample is purged by the purge trap 13 to transfer VOCs from the groundwater sample and transfer them into the first collection chamber 310;

[0052] S2. Collection of VOCs samples in soil gas

[0053] The regulating collection assembly 21 is placed in the soil gas well 20, and VOCs enter the regulating collection tube 213 and the lower collection tube 212 through the collection holes 215 and flow from bottom to top into the vacuum sampling box 22 for temporary storage, and finally transferred to the second collection chamber 311. The number of regulating collection tubes 213 and threaded tubes 214 can be freely increased or decreased according to the required collection depth, so as to complete the collection of VOCs in the soil gas from shallow to deep layers;

[0054] S3. Monitoring of VOCs pollution in groundwater and soil gas

[0055] The VOCs in the groundwater in the first collection chamber 310 and the VOCs in the soil gas in the second collection chamber 311 are respectively introduced into the detection main pipe 40, and then pass through the detection branch pipe 41 and sequentially pass through the PID photoionization detector 43 and the TCD detector 44. The VOCs molecules are ionized by the PID photoionization detector 43 and a current signal is generated. The concentration of the VOCs is monitored according to the magnitude of the current, and the gas composition of the VOCs is monitored by the TCD detector 44.

[0056] S4. Results Analysis

[0057] The data output by the PID photoionization detector 43 and the TCD detector 44 are collected and analyzed by the central processing module 5 to provide detailed information on VOCs in groundwater and soil gas.

[0058] Embodiment 3: This embodiment differs from Embodiment 1 in that:

[0059] like Figure 2 , 3As shown, an air inlet 220 and an air outlet 221 are respectively provided on the left and right sides of the vacuum sampling box 22, a collection air bag 222 is provided in the vacuum sampling box 22, one end of which is connected to the air inlet 220, and the other end of the collection air bag 222 is provided with a limit sliding plate 223 that can slide left and right along the inner wall of the vacuum sampling box 22, a connecting sleeve 224 is provided at the center of the limit sliding plate 223 near the air outlet 221, an automatic opening and closing plate 225 is provided at the air outlet 221, a vacuum pump 226 is connected to the side wall of the vacuum sampling box 22, the air outlet 221 is connected to the second collection chamber 311, and the VOCs collected in the soil gas enter the collection air bag 222 through the air inlet 220. As the VOCs continue to enter, the collection air bag 222 is gradually Gradually filled, at this time, the limiting sliding plate 223 on the collection air bag 222 moves in the vacuum sampling box 22 toward the air outlet 221, and at the same time, the vacuum sampling box 22 is evacuated to a negative pressure state through the vacuum pump 226, which speeds up the speed of VOCs entering the collection air bag 222 from the soil gas, thereby improving the sampling efficiency. When the connecting sleeve 224 contacts the air outlet 221, the automatic opening and closing plate 225 at the air outlet 221 automatically opens, and the collected VOCs enter the second collection chamber 311 through the air outlet 221 for collection, which can reduce the direct contact between the operator and the harmful VOCs and improve the safety of the sampling process. Among them, the automatic opening and closing plate 225 and the air pump 226 adopt the existing technology;

[0060] An arc-shaped mounting plate 240 is connected to the upper and lower ends of the air outlet 221 in the vacuum sampling box 22 through an electric telescopic rod 24. A sealing airbag 241 is provided on the inner wall of the arc-shaped mounting plate 240. An inflation port is provided on the sealing airbag 241. When the connecting sleeve 224 contacts the air outlet 221, the arc-shaped mounting plate 240 is driven to approach the joint between the connecting sleeve 224 and the air outlet 221 through the extension of the electric telescopic rod 24. When the two arc-shaped mounting plates 240 are buckled, the joint between the connecting sleeve 224 and the air outlet 221 is sealed through the sealing airbag 241. The sealing airbag 241 can automatically adjust according to the shape of the joint to form a tight seal, effectively prevent VOCs leakage, and ensure the airtightness of the sampling process. The electric telescopic rod 24 and the sealing airbag 241 adopt existing technology.

[0061] Embodiment 4: This embodiment differs from Embodiment 2 in that:

[0062] In step S2, the VOCs collected in the soil gas enter the collection air bag 222 through the air inlet 220. As the VOCs continue to enter, the collection air bag 222 is gradually filled. At this time, the limiting sliding plate 223 on the collection air bag 222 moves in the vacuum sampling box 22 toward the air outlet 221. At the same time, the inside of the vacuum sampling box 22 is evacuated to a negative pressure state through the vacuum pump 226. When the connecting sleeve 224 contacts the air outlet 221, the arc-shaped mounting plate 240 is driven to approach the joint between the connecting sleeve 224 and the air outlet 221 through the extension of the electric telescopic rod 24. When the two arc-shaped mounting plates 240 are buckled, the joint between the connecting sleeve 224 and the air outlet 221 is sealed by the sealing air bag 241.

Claims

1. Rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas at contaminated sites, characterized by: It comprises a first collection module (1) for collecting VOCs samples in groundwater, a second collection module (2) for collecting VOCs samples in soil gas, a collection module (3) connected to the first collection module (1) and the second collection module (2), an analysis and monitoring module (4) connected to the collection module (3), and a central processing module (5); The first collection module (1) comprises a groundwater well (10), a collection pipe (11) arranged in the groundwater well (10), an air bag pump (12) connected to the collection pipe (11), and a purge trap (13) connected to the air bag pump (12); the second collection module (2) comprises a soil gas well (20), a regulating collection component (21) arranged in the soil gas well (20), and a vacuum sampling box (22) connected to the regulating collection component (21); The collection module (3) comprises a collection body (30), a partitioning transverse plate (31) disposed in the collection body (30) and dividing the interior of the collection body (30) into a first collection chamber (310) and a second collection chamber (311), and a collection mounting frame (32) connected to the side wall of the collection body (30) via a fixing frame (320), the first collection chamber (310) being connected to the purge trap (13), and the second collection chamber (311) being connected to the vacuum sampling box (22); The analysis and monitoring module (4) comprises a detection main pipe (40) connected to the first collection chamber (310) and the second collection chamber (311), a detection branch pipe (41) connected to the detection main pipe (40), a flow control valve (42) connected end to end to the detection branch pipe (41), a PID photoionization detector (43) and a TCD detector (44); the central processing module (5) is electrically connected to the flow control valve (42), the PID photoionization detector (43) and the TCD detector (44).

2. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 1 is characterized in that: The regulating and collecting assembly (21) comprises an upper collecting tube (211) with a sealing ring (210) on the outer wall, a lower collecting tube (212) with a drilling fixing head (23) at the bottom, and a plurality of regulating and collecting tubes (213) distributed from top to bottom between the upper collecting tube (211) and the lower collecting tube (212); the regulating and collecting tube (213) at the uppermost end and the upper collecting tube (211), between two adjacent regulating and collecting tubes (213), and between the regulating and collecting tube (213) at the lowermost end and the lower collecting tube (212) are all threadedly connected via threaded tubes (214); and the outer walls of the regulating and collecting tube (213) and the lower collecting tube (212) are both provided with a plurality of collecting holes (215).

3. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 2 is characterized in that: The outer walls of the adjusting collection tube (213) and the lower collection tube (212) are both provided with a hollow collection cover (216), and each of the hollow collection covers (215) is provided with a plurality of collection holes (215).

4. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 3 is characterized in that: The sealing ring (210) is fixedly connected to the inner wall of the soil gas well (20), and a filter screen (217) is provided inside the regulating collection tube (213) and the lower collection tube (212) and at the upper end of the corresponding hollow collection cover (215).

5. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 1 is characterized in that: The vacuum sampling box (22) is provided with an air inlet (220) and an air outlet (221) on the left and right sides respectively. A collection air bag (222) is provided in the vacuum sampling box (22) and one end of the collection air bag is connected to the air inlet (220). The other end of the collection air bag (222) is provided with a limit sliding plate (223) that can slide left and right along the inner wall of the vacuum sampling box (22). A connecting sleeve (224) is provided at the center of the limit sliding plate (223) near the air outlet (221), and an automatic opening and closing plate (225) is provided at the air outlet (221). The side wall of the vacuum sampling box (22) is connected to an air pump (226), and the air outlet (221) is connected to the second collection chamber (311).

6. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 5 is characterized in that: An arc-shaped mounting plate (240) is connected to the vacuum sampling box (22) at the upper and lower ends of the air outlet (221) via an electric telescopic rod (24); a sealing airbag (241) is provided on the inner wall of the arc-shaped mounting plate (240); and an inflation port is provided on the sealing airbag (241).

7. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 1 is characterized in that: The PID photoion detector (43) and the TCD detector (44) are arranged on the collection mounting frame (32).

8. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 1 is characterized in that: A first air pressure detector (14) is provided at the connection between the first collection chamber (310) and the purge trap (13), and a second air pressure detector (15) is provided at the connection between the second collection chamber (311) and the vacuum sampling box (22).

9. The rapid in-situ monitoring system for VOCs pollution in groundwater and soil gas of contaminated sites according to claim 1 is characterized in that: The central processing module (5) is electrically connected to an electronic display screen (50).

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