Organic contaminated soil in-situ remediation extraction device and system

Abstract

The utility model relates to an organic contaminated soil in-situ remediation extraction device and system, which comprises an extraction well and a gas phase extraction pipe, the gas phase extraction pipe is arranged in the extraction well, a plurality of annular brushes are arranged in a gap between the gas phase extraction pipe and the extraction well from top to bottom, the adjacent annular brushes are mutually connected together through a connecting frame, and the connecting frame is connected with the gas phase extraction pipe. The uppermost annular brush is connected with a supporting disc through a connecting frame, the supporting disc is connected with a pressing rod, the pressing rod penetrates through the well lid to be connected with a pressing plate, and a first reset spring is arranged outside the pressing rod. The device can effectively clean the blockages in the extraction well and the gas extraction hole of the gas phase extraction pipe, can take out the accumulated blockages, is convenient to use, can adapt to gas phase extraction pipes and extraction wells of different specifications under the condition that the existing extraction well and gas phase extraction pipe are not replaced, and saves the upgrading cost.

Description

Technical Field

[0001] The utility model relates to the technical field of soil remediation, and in particular to an in-situ remediation extraction device and system for organic polluted soil. Background Art

[0002] In-situ soil remediation refers to a soil remediation technology that repairs or treats the contaminated soil directly at the site where the contamination occurred without moving it. It has the following advantages: good economy, especially microbial remediation method; low energy consumption, small changes in soil quality, and good harmony with the surrounding environment; no need to dig up the soil, even factories that are in operation can be repaired; low risk of pollutant spread, and no secondary pollution due to transportation and disposal of soil.

[0003] The in-situ soil bioremediation method is to promote the degradation of pollutants by supplying air or oxygen to the soil and relying on the aerobic activity of microorganisms. At the same time, the pressure gradient in the soil is used to force volatile organic compounds and degradation products to flow to the air wells, and then be removed by extraction through the air wells. Depending on the actual pollution situation, the removal of pollutants can also be enhanced by adding nutrient solution, exogenous high-efficiency degradation bacteria, etc. to the air or oxygen.

[0004] Therefore, the commonly used in-situ soil biological ventilation remediation system includes an exhaust system, an extraction well, a gas transmission system, a nutrient and water allocation system, an injection well, an exhaust gas treatment system, an online monitoring system and a supporting control system. The exhaust system generally includes a vacuum pump, an exhaust pipe network, a gas-water separation tank, a pressure gauge, a flow meter, and an exhaust fan. The gas transmission system includes a blower, an air transmission pipe network, etc. The nutrient and water allocation system includes a nutrient and water addition pipe network, an addition pump, a nutrient and water storage tank, etc. The exhaust gas treatment system includes a dust collector, an activated carbon adsorption tower, etc. The exhaust pipe network includes a plurality of exhaust pipes, and the exhaust pipes are installed in the extraction well. Most of the exhaust pipes have an exhaust hole at the bottom of the air pipe, and the top of the exhaust pipe is connected to the vacuum pump through a pipeline to extract organic gas or gas produced after biological decomposition from the soil. Due to the injection of nutrient solution, biodegradable bacteria, etc. into the soil, and the reaction of organic pollutants in the soil, some substances are produced. Under the action of pressure, they will move to the extraction well and extraction pipe and gather. In serious cases, the extraction holes will be blocked, the extraction efficiency will be reduced, and even the extraction pipe will be blocked. After these substances enter the extraction well, they will also precipitate downwards due to hitting the wall of the extraction pipe and precipitate between the extraction well and the extraction pipe. These bacterial clusters, nutrient solution, and reacted substances combine into floccules, which are very viscous and accumulate for a long time, blocking the pores at the bottom and cannot be effectively removed. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings, the purpose of the utility model is to provide an in-situ remediation extraction device and system for organic contaminated soil.

[0006] The technical solution adopted by the present utility model to solve its technical problems is as follows: An in-situ remediation extraction device for organically polluted soil, comprising an extraction well and a vapor extraction pipe. The vapor extraction pipe is arranged inside the extraction well, and a manhole cover is provided above the extraction well. There is a gap between the vapor extraction pipe and the extraction well. A plurality of annular brushes are arranged from top to bottom in the gap between the vapor extraction pipe and the extraction well. Adjacent annular brushes are connected to each other through a connecting frame. The uppermost annular brush is connected to a support disc through a connecting frame. The support disc is connected to a pressing rod, and the pressing rod passes through the manhole cover and is connected to a pressing plate. A first return spring is arranged outside the pressing rod. The upper section of the first return spring is fixed on the pressing rod, and the lower end of the first return spring is fixed on the manhole cover. A sleeve ring is arranged in the middle of the pressing disc and sleeved outside the vapor extraction pipe, and it slides up and down along the vapor extraction pipe.

[0007] Specifically, the annular brush comprises an annular brush frame, inner bristles, and outer bristles.

[0008] Specifically, universal balls are arranged inside the sleeve ring of the support disc.

[0009] Specifically, a plurality of pressing rods are provided, and each pressing rod is connected to the pressing plate.

[0010] Specifically, the extraction well is sequentially coated with a filter layer, a bentonite layer, and a well platform from bottom to top.

[0011] Specifically, the lowerermost annular brush is connected to a tray through a plurality of second return springs. A through hole is arranged in the middle of the tray, and the through hole is sleeved outside the vapor extraction pipe. The tray moves up and down along the vapor extraction pipe. A limit ring is arranged outside the bottom of the vapor extraction pipe.

[0012] Specifically, one end of the pressing plate is hinged to one end of a driving rod, and the other end of the driving rod is assembled with a rotating shaft near the outer side of a rotating disc. A rocker is arranged on the side surface of the rotating disc opposite to the driving rod, or the rotating disc is driven by a driving motor.

[0013] An in-situ remediation system for organically polluted soil, comprising the above-mentioned extraction well, and further comprising an injection gas pipeline network, a blower, a nutrient solution pipeline network, a nutrient solution tank body, a water pump, a vacuum pump, and an extraction gas pipe. The injection gas pipeline network and the nutrient solution pipeline network are buried in the polluted soil. The injection gas pipeline network is connected to the blower through a pipeline. The nutrient solution pipeline network is communicated with the nutrient solution tank body through a pipeline and a water pump. The gas outlet pipe at the upper end of the vapor extraction pipe is communicated with the extraction gas pipeline network. The extraction gas pipeline network is communicated with a gas-liquid separator through a pipeline. The gas-liquid separator is communicated with a filtering device through a pipeline. The filtering device is communicated with the vacuum pump through a pipeline.

[0014] The beneficial effects of the present utility model are as follows: In this application, through the design of the annular brush and the tray, the blockages in the extraction well and the extraction holes of the gas-phase extraction pipe can be effectively cleaned, and the accumulated blockages can be removed. It is convenient to use, and the annular brush can be installed without replacing the existing extraction well and gas-phase extraction pipe, so as to upgrade and transform the existing system. Moreover, the transformation is flexible. According to the length of the extraction holes of the actual gas-phase extraction pipe, by selecting different numbers of annular brushes or rotating different specifications of annular brushes, it can adapt to different specifications of gas-phase extraction pipes and extraction wells, saving the upgrade cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present utility model.

[0016] Figure 2 It is a schematic structural diagram above the extraction well of Embodiment 1 of the present utility model.

[0017] Figure 3 It is a schematic structural diagram below the extraction well of Embodiment 1 of the present utility model.

[0018] Figure 4 It is a schematic structural diagram of the support plate of Embodiment 1 of the present utility model.

[0019] Figure 5 It is a schematic structural diagram of the annular brush of Embodiment 1 of the present utility model.

[0020] Figure 6 It is a schematic structural diagram above the extraction well of Embodiment 2 of the present utility model.

[0021] Figure 7 It is a schematic structural diagram of Embodiment 3 of the present utility model.

[0022] In the figure, 1 is the extraction well, 101 is the filter layer, 102 is the bentonite layer, 103 is the well platform, 104 is the ventilation hole, 2 is the gas-phase extraction pipe, 201 is the extraction pipe, 3 is the well cover, 4 is the pipe end, 5 is the pressing rod, 501 is the pressing plate, 502 is the first return spring, 6 is the support plate, 7 is the connecting frame, 8 is the annular brush, 9 is the tray, 1001 is the driving rod, 1002 is the rotating disk, 11 is the gas-liquid separator, 12 is the filtering device, 13 is the vacuum pump, 14 is the extraction pipe network, 15 is the injection pipe network, 16 is the fan, 17 is the water pump, 18 is the nutrient solution pipe network, 19 is the nutrient solution tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Now, the present utility model will be further described in detail with reference to the accompanying drawings.

[0024] Embodiment 1

[0025] As Figures 1 to 5An in-situ remediation extraction device for organic contaminated soil as shown, includes an extraction well 1 and a vapor extraction pipe 2. The vapor extraction pipe 2 is arranged inside the extraction well 1. There is a manhole cover 3 above the extraction well 1. There is a gap between the vapor extraction pipe 2 and the extraction well 1. A plurality of ventilation holes 101 are opened on the wall of the extraction well 1. A plurality of extraction holes 201 are opened on the outer wall of the lower part of the vapor extraction pipe 2. A plurality of annular brushes 8 are arranged from top to bottom in the gap between the vapor extraction pipe 2 and the extraction well 1. Adjacent annular brushes 8 are connected to each other through a connecting frame 7. The topmost annular brush 8 is connected to a support disc 6 through a connecting frame 1. The support disc 6 is connected to a pressing rod 5. The pressing rod 5 passes through the manhole cover 3 and is connected to a pressing plate 501. A first return spring 502 is arranged outside the pressing rod 5. The upper section of the first return spring 502 is fixed on the pressing rod 5, and the lower end of the first return spring 502 is fixed on the manhole cover 3. A collar 601 is arranged in the middle of the pressing disc 6 and sleeved outside the vapor extraction pipe 2, and slides up and down along the vapor extraction pipe 2. The connecting frame 7 can be composed of multiple connecting rods. By pressing down the pressing plate 501, the pressing rod 5 presses the support disc 6 downward. The support disc 6 drives the annular brush 8 downward through the connecting frame 7. The brush hairs of the annular brush 8 brush the extraction holes 201 of the vapor extraction pipe 2, and at the same time, also brush down the condensates on the wall of the extraction well 1. After releasing the pressing plate 5, under the action of the first return spring 502, the pressing plate 501, the pressing rod 5, and the support disc 6 drive the annular brush 8 to move upward along the vapor extraction pipe 2 and brush again. After repeating several times like this, the viscous substances on the extraction holes 201 of the vapor extraction pipe 2 and the inner wall of the extraction well 1 can be brushed down.

[0026] Specifically, the annular brush 8 includes an annular brush frame 801, inner brush hairs 802, and outer brush hairs 803. The inner brush hairs 802 and the outer brush hairs 803 are made of hard plastic fibers or steel wires.

[0027] Specifically, universal balls 601 are arranged inside the collar 601 of the support disc 6 to make the sliding along the vapor extraction pipe 2 smoother.

[0028] Specifically, a plurality of pressing rods 5 are provided, and each pressing rod 5 is connected to the pressing plate 501 and is symmetrically distributed around the extraction well 1 at the center for balance.

[0029] Specifically, the extraction well 1 is sequentially coated with a filter layer 101, a bentonite layer 102, and a well platform 103 from bottom to top. The well platform 103 is made of cement or cement-bentonite pouring to isolate the outside atmosphere from entering the extraction area. The bentonite layer 102 is located below the well platform to play a secondary isolation role. The filter layer 101 is made of quartz sand as a water and gas filtration barrier to form a water and gas filtration system and play a good filtering role. Ventilation holes 104 are arranged on the filter layer 101.

[0030] Specifically, a plurality of second reset springs 901 are connected to the tray 9 below the lowermost annular brush 8. A through hole is provided in the middle of the tray 9, and the through hole is sleeved outside the vapor extraction pipe 2. The tray 9 moves up and down along the vapor extraction pipe 2. A limiting ring 201 is provided on the outer side of the bottom of the vapor extraction pipe 2 to prevent the tray 9 from coming off and can support the tray 9 when not being cleaned. The blocked substances brushed off are placed in the tray. After a certain period of time, after removing the manhole cover 3, the annular brush 8 and the tray 9 are pulled out upward by using the pressing rod, the blocked substances are cleared, and at the same time, the annular brush 8 is cleaned, maintained or replaced. After cleaning, it is put back into the extraction well 1 and can continue to work.

[0031] Embodiment 2

[0032] As Figure 6 shown in an in-situ remediation extraction device for organic contaminated soil, one end of the pressing plate 501 is hinged to one end of the driving rod 1001, and the other end of the driving rod 1001 is assembled with the rotating shaft near the outer side of the rotating disk 1002. A rocker is provided on the side surface of the rotating disk 1002 opposite to the driving rod 1001. By manually shaking the rocker, the rotating disk is driven, and then the pressing rod is driven to move, so that the pressing plate moves up and down, which is more rapid and convenient to use. Or the rotating disk 1002 is driven by a driving motor to achieve automatic cleaning, which is more labor-saving.

[0033] Embodiment 3

[0034] As Figure 6 shown in an in-situ remediation system for organic contaminated soil, including the above-mentioned extraction well 1, and also including an injection gas pipeline network 15, a blower 14, a nutrient solution pipeline network 18, a nutrient solution tank body 16, a water pump 17, a vacuum pump 13, and an extraction gas pipe 19. The injection gas pipeline network 15 and the nutrient solution pipeline network 18 are buried in the contaminated soil. The injection gas pipeline network 15 is connected to the blower 16 through a pipeline for injecting air into the contaminated soil. The nutrient solution pipeline network 18 is communicated with the nutrient solution tank body 19 through a pipeline and a water pump 17 for injecting nutrient solution and other substances into the contaminated soil. The gas outlet pipe of the upper end head 4 of the vapor extraction pipe 2 is communicated with the extraction gas pipeline network 14. The extraction gas pipeline network 14 is communicated with the gas-liquid separator 11 through a pipeline. The gas-liquid separator 11 is communicated with the filtering device 12 through a pipeline. The filtering device 12 is communicated with the vacuum pump 13 through a pipeline for extracting the organic gas in the contaminated soil, separating the extracted water vapor and filtering impurities, and then flowing into the next process or directly discharging to the atmosphere. If conditions permit, a layer of cement or cement bentonite can be laid above the contaminated soil to play a certain encapsulation role and make the treatment effect better.

[0035] The present utility model is not limited to the described embodiments. Any person should be aware that structural changes made under the inspiration of the present utility model, as long as they have the same or similar technical solutions as the present utility model, shall fall within the protection scope of the present utility model.

[0036] The technologies, shapes, and structures not described in detail in the present utility model are all well-known technologies.

Claims

1. An in-situ remediation extraction device for organically contaminated soil, comprising an extraction well and a vapor extraction pipe. The vapor extraction pipe is arranged in the extraction well, and a well cover is provided above the extraction well. It is characterized in that: A gap is provided between the gas extraction pipe and the extraction well. A plurality of annular brushes are arranged in the gap between the gas extraction pipe and the extraction well from top to bottom. Adjacent annular brushes are connected to each other through a connecting frame. The uppermost annular brush is connected to a support plate through a connecting frame. The support plate is connected to a pressing rod. The pressing rod passes through the well cover and is connected to a pressing plate. A first return spring is arranged outside the pressing rod. The upper section of the first return spring is fixed on the pressing rod, and the lower end of the first return spring is fixed on the well cover. A collar is arranged in the middle of the support plate and sleeved outside the gas extraction pipe, and slides up and down along the gas extraction pipe.

2. An in-situ remediation extraction device for organic polluted soil according to claim 1, characterized in that: The annular brush includes an annular brush frame, inner bristles, and outer bristles.

3. An in-situ remediation extraction device for organic contaminated soil according to claim 1, characterized in that: Universal balls are arranged on the inner side of the collar of the support plate.

4. An in-situ remediation extraction device for organic contaminated soil according to claim 1, characterized in that: A plurality of pressing rods are provided, and each pressing rod is connected to the pressing plate.

5. An in-situ remediation extraction device for organic contaminated soil according to claim 1, characterized in that: The extraction well is sequentially coated with a filter layer, a bentonite layer, and a well platform from bottom to top.

6. An in-situ remediation extraction device for organic contaminated soil according to claim 1, characterized in that: The lowerermost annular brush is connected to a tray through a plurality of second return springs. A through hole is arranged in the middle of the tray and sleeved outside the gas extraction pipe. The tray moves up and down along the gas extraction pipe. A limiting ring is arranged on the outer side of the bottom of the gas extraction pipe.

7. An in-situ remediation extraction device for organic polluted soil according to claim 1, characterized in that: One end of the pressing plate is hinged to one end of a driving rod. The other end of the driving rod is assembled with a rotating shaft near the outer side of a rotating disc. A rocker is arranged on the side surface of the rotating disc opposite to the driving rod, or the rotating disc is driven by a driving motor.

8. An in-situ remediation system for organically polluted soil, characterized in that: Including any one of the repair extraction devices described in claims 1 to 7, it further includes an injection gas pipeline network, a fan, a nutrient solution pipeline network, a nutrient solution tank, a water pump, a vacuum pump, and an extraction pipe. The injection gas pipeline network and the nutrient solution pipeline network are buried in the polluted soil. The injection gas pipeline network is connected to the fan through a pipeline. The nutrient solution pipeline network is communicated with the nutrient solution tank through a pipeline and a water pump.

9. An in-situ remediation system for organic contaminated soil according to claim 8, characterized in that: The gas outlet pipe at the upper end of the gas extraction pipe is communicated with an extraction gas pipeline network. The extraction gas pipeline network is communicated with a gas-liquid separator through a pipeline. The gas-liquid separator is communicated with a filtering device through a pipeline. The filtering device is communicated with a vacuum pump through a pipeline.

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