CN211803057U - Soil and groundwater pollution monitoring and prosthetic integration system - Google Patents

Abstract

An integrated system for monitoring and remediation of soil and groundwater pollution. The monitoring and remediation wells include an aeration pipeline screen whose depth is lower than the lowest water level of groundwater and a gas-phase extraction pipeline screen whose depth is greater than the maximum water level of groundwater. The road screen is connected to the aeration fan through the pipeline, and the aeration fan is connected to the air pipeline; the gas-phase extraction pipeline screen is connected to the gas-liquid separation tank and the vacuum pump through the pipeline, and the vacuum pump is connected to the exhaust gas treatment system; the gas-liquid separation tank is output The pipeline is connected to the soil gas monitoring system through the sampling pump. By combining the advantages of gas phase extraction and restoration, biological aeration restoration, soil gas monitoring and other technical methods, the utility model can not only restore the polluted soil and groundwater, but also monitor the soil and groundwater with potential pollution risks. Thus, the repairing effect and repairing efficiency are improved, and the pollution situation can be responded to in time, and the installation of the equipment is simple and the operation cost is low.

Description

An integrated system for soil and groundwater pollution monitoring and remediation

technical field

The utility model relates to the technical field of soil and groundwater pollution monitoring and restoration.

Background technique

Gas-phase extraction is a widely used remediation technology for the remediation of organic pollution in soil and groundwater. It is used to deal with the pollution of formation media in the vadose zone. The basic principle of gas-phase extraction is to generate negative pressure through vacuum pump extraction. When the air flows through the polluted area, it desorbs and entrains the volatile and semi-volatile organic pollutants in soil pores or groundwater. After being collected by the pumping well, it is finally processed to achieve the purpose of purifying the soil and groundwater in the vadose zone. Sometimes at the same time of extraction, aeration wells can be set up to artificially introduce air into the soil. The extracted gas should be discharged into the atmosphere after water vapor removal and adsorption treatment, or corresponding gas treatment technology should be adopted according to the different pollutants.

Groundwater pollution aeration remediation technology is an emerging in-situ remediation technology for removing volatile organic compounds in soil and groundwater. It was first applied in Germany in 1985 and is considered to be the most effective method to remove volatile organic compounds from saturated soil and groundwater. It has attracted much attention at present, and many places have adopted this technology for groundwater remediation, and achieved great results. Good results, the technology has good application prospects.

At present, for the in-situ remediation of pollution, only bioremediation, gas-phase extraction remediation technology, and aeration remediation technology are used alone, and such situations often occur after the soil and groundwater are polluted for a long time, and the pollutants accumulate. This pollution can only be discovered after a certain concentration or the site is redeveloped. It cannot be discovered and repaired in time at the initial stage of soil and groundwater pollution. This will often cause the pollution to continue to spread and cause incalculable economic losses.

Utility model content

The purpose of the utility model is to overcome the above problems existing in the prior art, and to provide an integrated system for monitoring and repairing soil and groundwater pollution.

The technical scheme adopted by the present invention to achieve the above purpose is: an integrated system for monitoring and repairing soil and groundwater pollution. The screen pipe 5 of the gas phase extraction pipeline that is greater than the highest water level of the groundwater, the screen pipe 4 of the aeration pipeline is connected to the aeration fan 1 through the pipeline, and the aeration fan 1 is connected to the air pipeline; The gas-liquid separation tank 7 is connected with the vacuum pump 10, and the vacuum pump 10 is connected with the exhaust gas treatment system; the output pipeline of the gas-liquid separation tank 7 is connected to the soil gas monitoring system through the sampling pump 13.

The depth of the screen tube 4 of the aeration pipeline is 0.5-1m lower than the lowest water level of the groundwater, and the depth of the screen tube 5 of the gas phase extraction pipeline is 0.5-1m higher than the highest water level of the groundwater.

An aeration pipeline switch 2 is installed on the pipeline between the aeration pipeline screen pipe 4 and the air blower 1 , and the aeration pipeline switch 2 is installed in the skid-mounted box 22 .

A gas phase extraction pipeline switch 9 is installed on the road between the liquid separation tank 7 and the vacuum pump 10 .

The exhaust gas treatment system includes an exhaust gas absorption device 11 and an exhaust gas VOCs detector 12 .

The soil gas monitoring system includes a gas-liquid separator 14 connected to the sampling pump 13 , and the gas-liquid separator 14 is connected to an oxygen detector 15 , a carbon dioxide detector 16 , a VOCs detector 17 , and a petroleum hydrocarbon detector 18 .

It also includes a drainage system, a drainage switch 19 is installed on the pipeline between the aeration fan 1 and the gas-liquid separation tank 7, a drainage valve 20 is installed on the drainage pipeline at the lower part of the gas-liquid separation tank 7, and a liquid level gauge 8 is installed on the gas-liquid separation tank 7. .

The pipeline between the gas-phase extraction pipeline screen tube 5 and the gas-liquid separation tank 7 is connected to the drug injection valve 6, and the pipeline between the gas-phase extraction pipeline screen tube 5 and the gas-liquid separation tank 7 is equipped with a drug injection prevention valve. Backflow switch 21 .

The integrated system for monitoring and repairing soil and groundwater pollution of the utility model, by combining the advantages of gas phase extraction and repairing, biological aeration repairing advantages and soil gas monitoring and other technical methods, can not only repair the polluted soil and groundwater, but also Soil and groundwater with potential contamination risks can be monitored, thereby improving the remediation effect and remediation efficiency, and responding to contamination in a timely manner, with simple equipment installation and low operating costs.

Description of drawings

Figure 1 is a schematic diagram of an integrated system for monitoring and remediation of soil and groundwater pollution according to the present invention.

In the figure: 1- Aeration fan, 2- Aeration pipeline switch, 3- Inspection and repair well, 4- Aeration pipeline screen, 5- Gas phase extraction pipeline screen, 6- Chemical injection valve, 7- -Gas-liquid separation tank, 8-liquid level gauge, 9-gas phase extraction pipeline switch, 10-vacuum pump, 11-exhaust gas absorption device, 12-exhaust gas VOCs detector, 13-sampling pump, 14-gas-liquid separator, 15-Oxygen detector, 16-CO2 detector, 17-VOCs detector, 18-Petroleum hydrocarbon detector, 19-Drain switch, 20-Drain valve, 21-Drug injection anti-backflow switch, 22-Skid box, 23- hard cover of the site, 24- groundwater level.

Detailed ways

The principle of an integrated system for monitoring and remediation of soil and groundwater pollution of the present invention is shown in Figure 1, including monitoring and remediation wells 3, aeration system, gas phase extraction system, soil gas monitoring system, exhaust gas treatment system, drainage system System and drug injection valve 6. The monitoring and repairing well 3 includes the aeration pipeline screen 4 whose depth is 0.5-1 m below the lowest water level of the groundwater and the gas-phase extraction pipeline screen 5 whose depth is 0.5-1 m higher than the maximum groundwater level. The aeration system includes an aeration pipeline screen 4, which is sequentially connected to the aeration pipeline switch 2 and the aeration fan 1 in the skid-mounted box 22 through the pipeline, and finally communicates with the outside air. The gas-phase extraction system includes a gas-extraction pipeline screen 5, which is sequentially connected with the drug injection anti-backflow switch 21, the gas-liquid separation tank 7 in the skid-mounted box 22, the gas-phase extraction pipeline switch 9 and the vacuum pump (10) through the pipeline. , and finally connected to the exhaust gas treatment system. The exhaust gas treatment system includes an exhaust gas absorption device 11 and an exhaust gas VOCs detector 12. After final treatment, the qualified exhaust gas is directly discharged. The soil gas monitoring system is located between the gas phase extraction pipeline switch 9 and the vacuum pump 10, using pipeline and sampling pump 13, gas-liquid separator 14, oxygen detector 15, carbon dioxide detector 16, VOCs detector 17 and petroleum hydrocarbon detection The meters 18 are connected in turn. The drainage system connects the aeration fan 1 , the drainage switch 19 , the gas-liquid separation tank 7 and the drainage valve 20 in sequence through pipelines. Whether the drainage system is turned on is controlled by the liquid level gauge 8 . The medicine injection valve 6 is mainly used for the injection of the medicine in the repair process. Before the medicine is injected, the medicine injection anti-backflow switch 21 must be closed.

When the integrated system for monitoring and repairing soil and groundwater pollution of the present invention works, the aeration fan 1 aerates the soil through the aeration pipeline screen 4, and the vacuum pump 10 separates the gas and liquid through the gas-phase extraction pipeline screen 5. Tank 7 extracts the soil gas samples in the monitored site, and processes and empties them through the exhaust gas absorption device 11 of the exhaust gas treatment system and the exhaust gas VOCs detector 12; the sampling pump 13 connected to the front pipeline of the vacuum pump 10 extracts the soil in the monitored site The gas sample is separated by the gas-liquid separator 14, and the soil gas is monitored in real time by the VOCs detector 17 and the petroleum hydrocarbon detector 18 of the soil gas monitoring system. Once soil and groundwater organic pollution occurs, the pollution data can be checked in time, and the restoration function can be activated. During the remediation process, the aeration system and the gas-phase extraction system work at the same time to promote the extraction of organic matter through the gas-phase extraction device. Reproduction and metabolism, and further adsorption and degradation of organic pollutants.

The utility model combines gas-phase extraction, biological aeration restoration technology and soil gas monitoring technology. Under the condition that soil and groundwater have been polluted, gas-phase extraction can remove volatile organic compounds in soil, and biological aeration can not only strengthen the During gas phase extraction, the air flow in the soil can increase the oxygen content in the soil, enhance the metabolism of microorganisms in the soil, and degrade organic pollutants. When the soil and groundwater are not polluted but have potential pollution risks, the utility model can not only repair the polluted soil and groundwater, but also monitor the soil and groundwater with potential pollution risks, thereby improving the repairing effect and repair efficiency, and respond to pollution in a timely manner, with simple equipment installation and low operating costs. It is suitable for volatile organic compounds, semi-volatile organic compounds and petroleum hydrocarbon contaminated sites or sites with potential pollution risks. It can not only monitor whether the site is polluted in time, but also start the restoration process after the site is polluted, preventing large-scale pollutants. diffusion.

The present invention is described through the embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, in the teachings of the present invention, the features and embodiments may be modified to adapt to a particular situation and material without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present invention.

Claims (8)

1. An integrated system for soil and groundwater pollution monitoring and restoration, characterized in that: the monitoring and restoration well (3) comprises an aeration pipeline screen pipe (4) whose depth is lower than the minimum water level of the groundwater and the depth is greater than the maximum water level of the groundwater. The gas phase extraction pipeline screen (5), the aeration pipeline screen (4) is connected to the aeration fan (1) through the pipeline, and the aeration fan (1) is connected to the air pipeline; the gas phase extraction pipeline screen ( 5) The gas-liquid separation tank (7) and the vacuum pump (10) are connected to the gas-liquid separation tank (7) and the vacuum pump (10) in turn through the pipeline, and the vacuum pump (10) is connected to the exhaust gas treatment system; the output pipeline of the gas-liquid separation tank (7) is connected to the soil gas through the sampling pump (13). Monitoring System. 2. The integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, characterized in that: the depth of the aeration pipeline screen pipe (4) is 0.5-1m lower than the minimum water level of the groundwater, and the gas-phase pumping The depth of the screen pipe (5) of the lifting pipe is greater than the maximum water level of the groundwater by 0.5-1m. 3. The integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, characterized in that: a pipe between the aeration pipeline screen (4) and the air blower (1) is installed on the pipe The aeration pipeline switch (2) is installed in the skid-mounted box body (22). 4. An integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, characterized in that: a gas phase extraction pipe is installed on the official road between the liquid separation tank (7) and the vacuum pump (10). circuit switch (9). 5. An integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, wherein the exhaust gas treatment system comprises an exhaust gas absorption device (11) and an exhaust gas VOCs detector (12). 6. The integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, wherein the soil gas monitoring system comprises a gas-liquid separator (14) connected to a sampling pump (13), The connecting pipeline of the gas-liquid separator (14) is connected to an oxygen detector (15), a carbon dioxide detector (16), a VOCs detector (17) and a petroleum hydrocarbon detector (18). 7. An integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, characterized in that it further comprises a drainage system, a pipe between the aeration fan (1) and the gas-liquid separation tank (7) A drain switch (19) is installed on the road, a drain valve (20) is installed on the drainage pipeline at the lower part of the gas-liquid separation tank (7), and a liquid level gauge (8) is installed on the gas-liquid separation tank (7). 8. The integrated system for monitoring and remediation of soil and groundwater pollution according to claim 1, characterized in that: a connection between the gas-phase extraction pipeline screen (5) and the gas-liquid separation tank (7) The pipeline is connected to the medicine injection valve (6), and the medicine injection anti-backflow switch (21) is installed on the pipeline between the gas phase extraction pipeline screen pipe (5) and the gas-liquid separation tank (7).

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