A soil - groundwater pollution remediation system and its usage method

Abstract

A soil - groundwater pollution remediation system and its usage method, which relate to the technical field of groundwater pollution treatment, include a central control system, a layered extraction well system, a gas treatment system, and a water treatment system; the layered extraction well system includes: horizontal wells; inclined wells; vertical wells; through the layered extraction well system, the groundwater and pollutant gases within the soil in a set range are comprehensively collected in layers; the gas treatment system and the water treatment system are located above the ground surface and are respectively connected to the layered extraction well system through pipelines, and the central control system is configured to control the layered extraction well system, the gas treatment system, and the water treatment system, and the groundwater after remediation is re - discharged into the soil within the set range. The present invention can achieve the comprehensive remediation of groundwater and soil pollution, and overcome the defect of incomplete remediation caused by separately remediating groundwater or soil.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater pollution control, and in particular to a soil-groundwater pollution remediation system and a method for using the same. Background Art

[0002] Soil and groundwater pollution prevention and control is a major challenge facing ecological and environmental protection worldwide. With the continuous development of social economy and the acceleration of industrialization, human beings have increased their development and utilization of natural resources. At the same time, soil and groundwater have also caused a lot of pollution. In particular, some pollutants such as persistent organic matter and heavy metals enter the soil and enter the groundwater through infiltration or migration and diffusion, causing serious groundwater pollution. Soil and groundwater pollution not only causes serious damage to the ecological environment, but also poses a huge threat to human health. At present, most pollution remediation focuses on single soil pollution remediation or groundwater pollution remediation. However, in actual situations, soil pollution is often accompanied by groundwater pollution, and repairing groundwater or soil pollution alone cannot completely solve the problem. Therefore, the comprehensive remediation of soil and groundwater pollution is very important and necessary. Summary of the invention

[0003] The present invention provides a soil-groundwater pollution remediation system and a method for using the same, the purpose of which is to achieve comprehensive remediation of groundwater and soil pollution and overcome the defect of incomplete remediation caused by remediating groundwater or soil alone.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A soil-groundwater pollution remediation system comprises a central control system, a stratified extraction well system, a gas treatment system and a water treatment system; the stratified extraction well system comprises: a horizontal well; an inclined well; a vertical well; the stratified extraction well system is used to realize stratified and comprehensive collection of groundwater and pollutant gases in the soil within a set range; the gas treatment system and the water treatment system are arranged above the ground surface and are respectively connected to the stratified extraction well system through pipelines; the central control system is configured to control the stratified extraction well system, the gas treatment system and the water treatment system, and the repaired groundwater is discharged back into the soil within the set range.

[0006] Preferably, the vertical shaft extends below the ground surface, and the bottom end of the vertical shaft reaches the depth of the lower layer of the soil within a set range; the horizontal wells are located at the depth of the upper layer of the soil within the set range and are evenly distributed around the axis of the vertical shaft, and the end of the horizontal well close to the vertical shaft is connected to the ground surface through a first longitudinally arranged shaft; the inclined shaft is located at the depth of the middle layer of the soil within the set range, and several inclined shafts are evenly distributed around the axis of the vertical shaft, and the high end of the inclined shaft is located on the side close to the vertical shaft, and is connected to the ground surface through a second longitudinally arranged pipe.

[0007] Preferably, there are 4 horizontal wells and 4 inclined wells respectively. A first aeration device and a filter are installed at the bottom of the vertical well, and a second aeration device is installed at the bottom of the inclined well.

[0008] Preferably, the gas treatment system includes a gas-liquid separation device, a first pressure gauge, a second pressure gauge, a gas treatment device, and a vacuum compression pump. The vacuum compression pump includes a plurality of first pump bodies and a plurality of second pump bodies. The input ends of the plurality of first pump bodies are respectively connected to the upper ports of the vertical well, the inclined well, or the horizontal well through gas collection pipelines. The output ends of the first pump bodies are respectively connected to the gas-liquid separation device through first connecting pipes. A gas monitoring device is provided on the first connecting pipe. The gas-liquid separation device is used to separate the liquid in the gas pollutants. The separated liquid is input into the water treatment system through a second connecting pipe. The remaining pollutant gas is transported to the gas treatment device through a third pipeline. A first pressure gauge for detecting the pressure of the gas pollutants is provided on the third pipeline. The output end of the gas treatment device is connected to a fourth pipeline. A pressure relief valve and a second pressure gauge are provided on the fourth pipeline. The end of the fourth pipeline is respectively connected to the input ends of each second pump body through a multi-way joint. The output end of the second pump body is connected to the first aeration device or the second aeration device through a fifth pipeline. The gas treatment device is used to repair the pollutant gas. The repaired gas enters the fourth pipeline. When the second pressure gauge is higher than the set pressure value, the pressure relief valve opens.

[0009] Preferably, the water treatment system is located on the ground surface corresponding to the upstream position of the groundwater within the set range of the soil. It includes a plurality of water pumps, a flow meter, a water treatment device, a reservoir, an activated carbon grid, and a permeable reactive wall. A storage pool is provided on one side of the water treatment device. An activated carbon grid and a permeable reactive wall are sequentially provided from top to bottom at the bottom of the storage pool. The input end of the water pump is communicated with the groundwater in the vertical well through a sixth pipeline. The output end of the water pump is connected to the input end of the water treatment device through a seventh pipeline. A flow meter is provided on the seventh pipeline. Water quality detectors are respectively provided in the seventh pipeline and the reservoir. The output end of the water treatment device is connected to the reservoir through an eighth pipeline.

[0010] A method for using a soil-groundwater pollution remediation system includes the following steps:

[0011] (1) Install a soil-groundwater pollution remediation system at the polluted site, debug it, and ensure that the soil-groundwater pollution remediation system operates normally;

[0012] (2) Under the control of the central control system, groundwater in the vertical shaft is pumped out by a water pump. The groundwater in the vertical shaft enters the water pump after being filtered by a filter, and then enters the water treatment device through the seventh pipeline. The water treatment device repairs the groundwater. The repaired groundwater enters the reservoir and then enters the groundwater after being treated by an activated carbon grid and a permeable reactive wall. During this process, the water quality in the seventh pipeline and the reservoir is detected by a water quality detector. This cycle repeats. When the water quality in the seventh pipeline meets the standard, the extraction of groundwater in the vertical shaft is stopped;

[0013] (3) The first aeration device is turned on to blow out the pollutant gas in the groundwater in the vertical shaft. The pollutant gas enters the gas-liquid separation device through the first pump body. The separated pollutant gas enters the gas treatment device, and the liquid enters the water treatment device. The repaired gas from the gas treatment device is pumped into the first aeration device through the second pump body. When the value of the second pressure gauge is higher than the set pressure value, the pressure relief valve is opened to relieve pressure; this cycle repeats until the data detected by the gas monitoring device returns to normal, realizing the repair and treatment of the pollutant gas in the groundwater of the vertical shaft;

[0014] (4) According to the method in step (3), the pollutant gas in the inclined shaft is treated, and the pollutant gas in the horizontal well is treated; after all the treatment and repair are completed, the soil - groundwater pollution repair system is shut down;

[0015] (5) After the soil - groundwater pollution repair system is shut down for a period of time, after the pollution source on the soil surface within the set range releases pollutants, steps (2) - (4) are repeated;

[0016] (6) Step (5) is repeated until the pollutant concentration in the soil and groundwater is treated below the standard, completing the repair.

[0017] The beneficial effects of a soil - groundwater pollution repair system and its use method of the present invention are as follows:

[0018] By setting up a layered extraction well system, the present invention can achieve a comprehensive layered collection of groundwater and pollutant gas in the soil. Through repeated treatment, it can achieve a comprehensive treatment of soil and groundwater pollution, thus avoiding the problem of incomplete repair effect caused by treating groundwater or soil alone.

[0019] Explanation of the drawings

[0020] Figure 1 is a structural schematic diagram of the present invention.

[0021] Figure 2 is a top - view structural schematic diagram of the layered extraction well system.

[0022] In the figure: 01 - groundwater level, 02 - groundwater flow direction, 03 - air flow, 1 - central control system, 2 - water quality detector, 3 - water treatment device, 4 - flow meter, 5 - water pump, 6 - second pressure gauge, 7 - vacuum compression pump, 8 - gas treatment device, 9 - gas monitoring device, 10 - gas-liquid separation device, 11 - first pressure gauge, 12 - storage tank, 13 - activated carbon grid, 14 - permeable reactive wall, 15 - horizontal well, 16 - inclined well, 17 - pollutant, 18 - vertical well, 19 - filter, 20 - first aeration device, 21 - first valve, 22 - second valve, 23 - third valve, 24 - fourth valve, 25 - fifth valve, 26 - sixth valve, 27 - second aeration device. Detailed implementation mode

[0023] The following description is only for the preferred embodiments of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0024] The following embodiments can be understood as separately expressing a part of the local structure or method of the present invention, or can also be understood as the embodiments combined with each other to explain the connotation of the structure or method in a larger scope of the present invention.

[0025] Embodiment 1

[0026] A soil - groundwater pollution remediation system, as Figure 1 , 2 shown, includes a central control system 1, a layered extraction well system, a gas treatment system, and a water treatment system; the layered extraction well system includes: a horizontal well 15; an inclined well 16; a vertical well 18; through the layered extraction well system, the layered comprehensive collection of groundwater and pollutant gases in the soil within a set range is realized; the gas treatment system and the water treatment system are arranged above the ground surface and are respectively connected to the layered extraction well system through pipelines, and the central control system is configured to control the layered extraction well system, the gas treatment system, and the water treatment system, and the groundwater after remediation is re-discharged into the soil within the set range.

[0027] In this embodiment, the central control system generally includes a computer, software, wires, and a data acquisition and processing system. The function of the central control system is to control the layered extraction well system, the gas treatment system, and the water treatment system to realize the cyclic treatment and remediation of groundwater and pollutant gases; the function of the layered extraction well system is to realize the layered comprehensive collection of groundwater. Among them, the soil within the set range refers to the soil within the set spatial range. Since the groundwater and pollutant gases in the soil are distributed at different depths, the layered extraction well system can be set up to realize the layered comprehensive collection of groundwater and pollutant gases.

[0028] Embodiment 2

[0029] As Figure 1 , 2 shown, the vertical shaft 18 extends downward below the ground surface, and the bottom end of the vertical shaft 18 reaches the depth of the lower layer within the set range of soil; the horizontal wells 15 are located at the depth of the upper layer within the set range of soil and are evenly distributed around the axis of the vertical shaft 18. One end of the horizontal well 15 close to the vertical shaft is connected to the ground surface through a longitudinally arranged first well passage; the inclined wells 16 are located at the depth of the middle layer within the set range of soil, and a plurality of inclined wells 16 are evenly distributed around the axis of the vertical shaft 18. The high-end of the inclined well 16 is located on one side close to the vertical shaft 18 and is connected to the ground surface through a longitudinally arranged second pipeline.

[0030] Example 3

[0031] As Figure 1 , 2 shown, there are 4 horizontal wells 15 and 4 inclined wells 16 respectively. A first aeration device 20 and a filter 19 are installed at the bottom of the vertical shaft 18, and a second aeration device is installed at the bottom of the inclined well 16.

[0032] Example 4

[0033] As Figure 1 shown, the gas treatment system includes a gas-liquid separation device 10, a first pressure gauge 6, a second pressure gauge 11, a gas treatment device 8, and a vacuum compression pump. The vacuum compression pump includes a plurality of first pump bodies and a plurality of second pump bodies. The input ends of the plurality of first pump bodies are respectively connected to the upper ports of the vertical shaft 18 or the inclined well 16 or the horizontal well through gas collection pipelines. The output ends of the first pump bodies are respectively connected to the gas-liquid separation device 10 through first connecting pipes. A gas monitoring device 9 is provided on the first connecting pipe. The gas-liquid separation device 10 is used to separate the liquid in the gas pollutants. The separated liquid is input into the water treatment system through a second connecting pipe. The remaining pollutant gas is transported to the gas treatment device 8 through a third pipeline. A first pressure gauge 11 for detecting the pressure of the gas pollutants is provided on the third pipeline; the output end of the gas treatment device 8 is connected to a fourth pipeline. A pressure relief valve and a second pressure gauge 6 are provided on the fourth pipeline. The end of the fourth pipeline is respectively connected to the input ends of each second pump body through a multi-way joint. The output end of the second pump body is connected to the first aeration device or the second aeration device through a fifth pipeline. The gas treatment device is used to repair the pollutant gas. The repaired gas enters the fourth pipeline. When the second pressure gauge 6 is higher than the set pressure value, the pressure relief valve opens.

[0034] Example 5

[0035] As Figure 1As shown in the figure, the water treatment system is located on the ground surface corresponding to the upstream position of the groundwater within the set range of soil, and includes multiple water pumps 5, flow meters 4, water treatment devices 3, a reservoir 12, activated carbon grids 13, and a permeable reactive wall 14. A reservoir 12 is provided on one side of the water treatment device. The bottom of the reservoir 12 is successively provided with an activated carbon grid 13 and a permeable reactive wall 14 from top to bottom. The input end of the water pump 5 is connected to the groundwater in the vertical shaft 18, horizontal well 15, and inclined well 16 through a sixth pipeline respectively. The output end of the water pump 5 is connected to the input end of the water treatment device 3 through a seventh pipeline. A flow meter 4 is provided on the seventh pipeline. Water quality detectors 2 are respectively provided in the seventh pipeline and the reservoir 12. The output end of the water treatment device 3 is connected to the reservoir 12 through an eighth pipeline.

[0036] Example 6

[0037] A method for using a soil - groundwater pollution remediation system, as Figure 1 、 2 shown, includes the following steps:

[0038] (1) Install a soil - groundwater pollution remediation system at the polluted site, debug and ensure that the soil - groundwater pollution remediation system operates normally;

[0039] (2) Under the control of the central control system, pump the groundwater in the vertical shaft through the water pump. The groundwater in the vertical shaft enters the water pump after being filtered by the filter, and then enters the water treatment device through the seventh pipeline. The water treatment device remediates the groundwater. The remediated groundwater enters the reservoir, and after being treated by the activated carbon grid and the permeable reactive wall, it enters the groundwater. During this process, the water quality in the seventh pipeline and the reservoir is detected by the water quality detector. This cycle repeats. When the water quality in the seventh pipeline meets the standard, stop pumping the groundwater in the vertical shaft;

[0040] (3) Turn on the first aeration device to blow out the pollutant gas in the groundwater in the vertical shaft. The pollutant gas enters the gas - liquid separation device through the first pump body. The separated pollutant gas enters the gas treatment device, and the liquid enters the water treatment device. The gas after being remediated by the gas treatment device is pumped into the first aeration device through the second pump body. When the value of the second pressure gauge is higher than the set pressure value, open the pressure relief valve to relieve pressure; this cycle repeats until the data detected by the gas monitoring device returns to normal, realizing the remediation of the pollutant gas in the groundwater of the vertical shaft;

[0041] (4) According to the method in step (3), treat the pollutant gas in the inclined well and treat the pollutant gas in the horizontal well; after all the treatment and remediation are completed, turn off the soil - groundwater pollution remediation system;

[0042] After shutting down the soil - groundwater pollution remediation system for a period of time, after the pollution source on the surface of the soil within the set range releases pollutants, repeat steps (2)-(4);

[0043] (6) Repeat step (5) until the pollutant concentrations in the soil and groundwater are treated below the standard to complete the remediation.

Claims

1. A soil - groundwater pollution remediation system, characterized by: It includes a central control system, a layered extraction well system, a gas treatment system, and a water treatment system; the layered extraction well system includes: horizontal wells; inclined wells; vertical wells; through the layered extraction well system, the groundwater and pollutant gases in the soil within a set range are comprehensively collected in layers; the gas treatment system and the water treatment system are located above the ground surface and are respectively connected to the layered extraction well system through pipelines, and the central control system is configured to control the layered extraction well system, the gas treatment system, and the water treatment system. The treated groundwater is re-discharged into the soil within the set range, and through repeated treatment, the comprehensive treatment of soil and groundwater pollution is achieved; The vertical well extends downward to the ground surface, and the bottom end of the vertical well reaches the depth of the lower layer within the soil of the set range; the horizontal wells are located at the depth of the upper layer within the soil of the set range and are evenly distributed around the axis of the vertical well. One end of the horizontal well close to the vertical well is connected to the ground surface through a longitudinally arranged first well passage; the inclined wells are located at the depth of the middle layer within the soil of the set range, and several inclined wells are evenly distributed around the axis of the vertical well. The high end of the inclined well is located on the side close to the vertical well and is connected to the ground surface through a longitudinally arranged second pipeline; There are 4 horizontal wells and 4 inclined wells respectively. A first aeration device and a filter are installed at the bottom of the vertical well, and a second aeration device is installed at the bottom of the inclined well; The gas treatment system includes a gas-liquid separation device, a first pressure gauge, a second pressure gauge, a gas treatment device, and a vacuum compression pump. The vacuum compression pump includes a plurality of first pump bodies and a plurality of second pump bodies. The input ends of the plurality of first pump bodies are respectively connected to the upper ports of the vertical well, the inclined well, or the horizontal well through gas collection pipelines. The output ends of the first pump bodies are respectively connected to the gas-liquid separation device through first connecting pipes. A gas monitoring device is provided on the first connecting pipe. The gas-liquid separation device is used to separate the liquid in the gas pollutants. The separated liquid is input into the water treatment system through a second connecting pipe, and the remaining pollutant gas is transported to the gas treatment device through a third pipeline. A first pressure gauge for detecting the pressure of the gas pollutants is provided on the third pipeline; the output end of the gas treatment device is connected to a fourth pipeline. A pressure relief valve and a second pressure gauge are provided on the fourth pipeline. The end of the fourth pipeline is respectively connected to the input ends of each second pump body through a multi-way joint. The output end of the second pump body is connected to the first aeration device or the second aeration device through a fifth pipeline. The gas treatment device is used to repair the pollutant gas. The treated gas enters the fourth pipeline. When the second pressure gauge is higher than the set pressure value, the pressure relief valve opens; The described water treatment system is located on the ground surface corresponding to the upstream position of the groundwater within the set range of soil, and includes multiple water pumps, flow meters, water treatment devices, water storage tanks, activated carbon grids, and permeable reactive barriers. A water storage tank is provided on one side of the water treatment device. An activated carbon grid and a permeable reactive barrier are successively provided at the bottom of the water storage tank from top to bottom. The input end of the water pump is connected to the groundwater in the shaft through a sixth pipeline, and the output end of the water pump is connected to the input end of the water treatment device through a seventh pipeline. A flow meter is provided on the seventh pipeline, and water quality detectors are respectively provided in the seventh pipeline and the water storage tank. The output end of the water treatment device is connected to the water storage tank through an eighth pipeline.

2. The method of using a soil - groundwater pollution remediation system according to claim 1, characterized in that, It includes the following steps: (1) Install a soil - groundwater pollution remediation system at the contaminated site, debug and ensure the normal operation of the soil - groundwater pollution remediation system; (2) Under the control of the central control system, pump the groundwater in the shaft through the water pump. The groundwater in the shaft enters the water pump after being filtered by the filter, and then enters the water treatment device through the seventh pipeline. The water treatment device remediates the groundwater. The remediated groundwater enters the water storage tank and then enters the groundwater after being treated by the activated carbon grid and the permeable reactive barrier. During this process, the water quality in the seventh pipeline and the water storage tank is detected by the water quality detector. Repeat this process. When the water quality in the seventh pipeline meets the standards, stop pumping the groundwater in the shaft; (3) Turn on the first aeration device to blow out the pollutant gas in the groundwater in the shaft. The pollutant gas enters the gas - liquid separation device through the first pump body. The separated pollutant gas enters the gas treatment device, and the liquid enters the water treatment device. The gas repaired by the gas treatment device is pumped into the first aeration device through the second pump body. When the value of the second pressure gauge is higher than the set pressure value, open the pressure relief valve to relieve pressure; repeat this process until the data detected by the gas monitoring device returns to normal, realizing the remediation of the pollutant gas in the shaft groundwater; (4) According to the method in step (3), treat the pollutant gas in the inclined shaft and the pollutant gas in the horizontal well; after all the treatment and remediation are completed, turn off the soil - groundwater pollution remediation system; (5) After turning off the soil - groundwater pollution remediation system for a period of time, when the pollution source on the ground surface of the set - range soil releases pollutants, repeat steps (2) - (4); (6) Repeat step (5) until the pollutant concentration in the soil and groundwater is treated below the standard, completing the remediation.

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