CN210995782U - Contaminated site soil-groundwater integral type simulation prosthetic devices - Google Patents

Abstract

The utility model provides a soil-groundwater integrated simulation restoration device and method for polluted sites, wherein the device comprises four parts: a soil column simulation device, a groundwater simulation device, a rainfall simulation device and a monitoring device. The soil column simulation device mainly includes a cylinder, a permeable geotextile and a soil sampling port. The groundwater simulation device mainly includes a box, a groundwater injection port, a groundwater flow outlet, a groundwater sampling port, a peristaltic pump, an inlet and outlet water pipe, and a liquid storage tank. The monitoring device includes an integrated monitoring probe. The device of the utility model uses the rainfall and seepage simulation device to realize the combined simulation of the rainfall infiltration and the water flow infiltration in the vadose zone of the soil, and adopts the integrated monitoring probe to realize the parameters such as the temperature, pH, dissolved oxygen and groundwater velocity of the soil layer and groundwater layer. The real-time monitoring can accurately simulate the complex structure of the vadose zone, and realize the soil/groundwater integrated restoration simulation and restoration process monitoring and evaluation.

Description

Soil-groundwater integrated simulation remediation device for contaminated sites

technical field

The utility model belongs to the technical field of polluted site restoration research, in particular to a soil-groundwater integrated simulation restoration device for polluted sites.

Background technique

Contaminated sites refer to sites that are polluted by activities such as production, operation, treatment, and storage of toxic and hazardous substances, stacking or disposal of hazardous wastes, and mining activities, and cause harm to human health or the ecological environment. With the development of my country's economy, the upgrading of the industrial structure and the acceleration of the urbanization process, the soil of the sites left by some heavily polluted enterprises has also been polluted, and environmental hidden dangers have become increasingly prominent. Due to precipitation or surface water infiltration, pollutants inevitably enter groundwater through soil, causing groundwater pollution.

Soil can be divided into vadose zone (unsaturated zone) and saturated zone (saturated zone), and the part of water in the saturated zone is collectively referred to as groundwater. Shallow groundwater is dominated by vertical circulation, and recharge is mainly from atmospheric precipitation, surface water and field irrigation. The amount of atmospheric precipitation, precipitation intensity, and precipitation duration directly affect the recharge characteristics of groundwater. Discharge is mainly evapotranspiration, artificial exploitation and groundwater exploitation. The vadose zone is the main channel for groundwater recharge and discharge, and it is also an important part of the migration and transformation of pollutants in the soil-groundwater system.

Commonly used site pollution remediation techniques can be roughly divided into three categories: physical, chemical, and biological. Among them, microbial remediation technology is an emerging technology that is clean, efficient, easy to apply and has great potential for development. At present, whether it is in-situ microbial remediation technology, or ex-situ microbial remediation technologies such as prefabricated beds, composting treatment, and bioreactors, they only serve a single medium (soil or groundwater), and have not achieved integrated soil/groundwater remediation. In addition, the simulation of the migration and transformation of pollutants in the soil-groundwater system is mainly carried out by indoor soil column or seepage tank experiments. These methods do not simulate the combined effect of rainwater leaching and seepage in the soil vadose zone, and lack of soil- The groundwater system, especially the monitoring and evaluation of parameters such as temperature, pH and dissolved oxygen in the soil vadose zone, does not meet the requirements for monitoring and post-evaluation of the site pollution remediation process.

Based on the above problems, the utility model proposes a soil-groundwater integrated simulation remediation device for polluted sites, which can accurately simulate the complex structure of the vadose zone, and realize soil/groundwater integrated remediation simulation and restoration process monitoring and evaluation.

Utility model content

The purpose of the utility model is to overcome the shortcomings of the existing device simulation method that is too simple and does not meet the requirements of pollution restoration process detection and post-assessment, and provides a soil-groundwater integrated simulation system and restoration method for polluted sites, which can accurately simulate the complex structure of the vadose zone. , realize multi-media integrated repair simulation, support repair process detection and evaluation.

The technical scheme that the utility model adopts is as follows:

A soil-groundwater integrated simulation restoration device for contaminated sites, comprising a soil column simulation device, a groundwater simulation device, an artificial rainfall device and a monitoring device; the soil column simulation device is fitted and placed above the groundwater simulation device; the soil column The simulation device includes a cylinder body, a seepage injection port and a soil sampling port. Several seepage injection ports and a number of soil sampling ports are respectively provided on the side wall of the cylinder body at different heights. Permeable geotextile, the top of the permeable geotextile is used to fill the soil to be simulated, the seepage injection port is connected to a simulated seepage liquid storage tank through a pipeline; the groundwater simulation device includes a box, a groundwater injection port, a groundwater flow outlet and a groundwater sampling port, The top of the box body is connected with the bottom of the cylinder body through perforations, so that the water flow between them can migrate vertically through the gravel layer; one side of the side wall of the box body is provided with a groundwater injection port, and the other side is provided with a groundwater outflow outlet and groundwater respectively a sampling port; the groundwater injection port is connected to a first liquid storage tank through a water inlet pipe, the groundwater flow outlet is connected to a second liquid storage tank through a water outlet pipe, and a peristaltic pump is provided on the water inlet pipe and the water outlet pipe; the artificial rainfall device It is located above the soil to be simulated filled in the soil column simulation device, and its inlet is connected to a simulated rainfall storage tank through a pipeline; the monitoring device includes a number of integrated monitoring probes, which are respectively located in the cylinder body at different heights of the soil to be simulated and the tank Inside the body, it is used to monitor the temperature, pH, dissolved oxygen and groundwater flow rate at each setting location.

Preferably, each pipeline is provided with a valve for controlling the opening and closing of the pipeline.

Preferably, the aspect ratio of the cylindrical body is 1:1 to 4:1.

Preferably, the diameter of the perforation between the top of the box and the bottom of the cylinder is 1 mm to 10 mm.

Preferably, the particle size of the gravel in the gravel layer is larger than the diameter of the bottom perforation.

Preferably, a plurality of the integrated monitoring probes are evenly arranged from top to bottom in the soil in the cylinder, and at least one is arranged inside the box.

Preferably, a plurality of the seepage injection ports and soil sampling ports are provided, and they are uniformly arranged vertically along the side wall of the cylinder body;

Preferably, the box body is made of transparent plexiglass, and a stainless steel support frame is provided on the periphery.

Preferably, the integrated monitoring probe includes a temperature monitoring probe, a pH monitoring probe and a dissolved oxygen monitoring probe, and a water flow velocity monitoring probe is also integrated into the integrated monitoring probe located inside the box.

Another object of the present invention is to provide a method for simulating restoration using the above-mentioned soil-groundwater integrated simulated restoration device for contaminated sites, comprising the following steps:

1) Collect soil samples in layers from the research area, and carry out uniform refinement and drying respectively;

2) Fill the bottom of the cylinder with a gravel layer to simulate a water-saturated layer, and lay a permeable geotextile on the top of the gravel layer; fill the soil samples treated in step 1) on the top of the permeable geotextile according to the layering order of the original soil, and the filled soil The height is higher than the uppermost seepage injection port opened on the side wall of the cylinder, and the filled soil is used to simulate the aquifer;

3) Obtain actual groundwater samples from in-situ drilling in the studied area and inject them into the first storage tank, inject the simulated rainfall solution into the simulated rainfall storage tank, and inject the simulated seepage liquid into the simulated seepage storage tank;

4) According to the rainfall intensity to be simulated, the simulated rainfall solution in the simulated rainfall storage tank is uniformly leached into the soil filled in the cylinder by controlling the artificial rainfall device; the simulated seepage liquid in the simulated seepage storage tank is passed through the seepage flow The positive pressure of the injection port is injected into the soil layer, and the actual groundwater is injected into the tank through the groundwater injection port by controlling the peristaltic pump;

5) With the progress of water injection, the water flow in the box gradually flows out of the groundwater simulation device and enters the second liquid storage tank to form a groundwater simulation; through the control of the peristaltic pump, the water level of the groundwater flowing through the box is stabilized at the set value, Simulate the migration and transformation of pollutants in the soil-groundwater system of the site;

6) During the simulation process, the temperature, pH, dissolved oxygen and groundwater flow velocity of soil and groundwater at different depths were monitored in real time by integrated monitoring probes; at the same time, soil and groundwater samples were collected through the soil sampling port and the groundwater sampling port respectively.

The utility model has the following beneficial effects: 1) serving the soil-groundwater medium, and realizing integrated restoration simulation; 2) using the rainfall and seepage simulation device to realize the combined simulation of rainfall infiltration and water flow infiltration in the soil vadose zone, which can effectively Simulate the migration and transformation of pollutants in the soil-groundwater system of the site; 3) Real-time monitoring of parameters such as soil layer and groundwater layer temperature, pH, dissolved oxygen and groundwater flow rate can be achieved by using integrated monitoring probes, which can accurately monitor soil- Environmental conditions of groundwater systems to support site contamination remediation process monitoring and post-assessment.

Description of drawings

Fig. 1 is the schematic diagram of the soil-groundwater integrated simulation remediation device of the contaminated site of the present invention;

In the figure: cylinder 1, artificial rainfall device 2, seepage injection port 3, soil sampling port 4, permeable geotextile 5, box 6, peristaltic pump 7, integrated monitoring probe 8, groundwater injection port 9, groundwater outflow outlet 10 , a groundwater sampling port 11 , a first liquid storage tank 12 , a second liquid storage tank 13 , a simulated rainwater storage tank 14 , a simulated seepage liquid storage tank 15 , and a data acquisition device 16 .

Detailed ways

In order to further understand the present utility model, the present utility model will be further elaborated and described below in conjunction with the accompanying drawings and specific embodiments, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present utility model, rather than the claims of the present utility model. limit.

As shown in Figure 1, a soil-groundwater integrated simulation remediation device for contaminated sites includes a soil column simulation device, a groundwater simulation device, an artificial rainfall device 2 and a monitoring device, wherein the soil column simulation device is fitted and placed above the groundwater simulation device , the lower end of the soil column simulation device and the upper end of the groundwater simulation device are fixedly connected. The bottom of the soil column simulation device can be fully supported by the top of the groundwater simulation device, so that all the water flowing down from the soil column simulation device can enter the groundwater simulation device.

The soil column simulation device includes a cylinder body 1 , a seepage injection port 3 and a soil sampling port 4 . The cylinder body 1 is the main body of the entire soil column simulation device. The seepage injection port 3 and the soil sampling port 4 are both arranged on the side wall of the cylinder body 1, and the seepage injection port 3 and the soil sampling port 4 can be respectively along the cylinder body 1 as required. The side walls are evenly arranged vertically to simulate actual seepage and collect soil at different depths. The bottom of the cylinder body 1 is filled with a layer of gravel, and a layer of permeable geotextile 5 is laid above the gravel layer. The permeable geotextile 5 is used to fill the soil to be simulated. When the soil is filled, the soil layer can simulate an aquifer, while the gravel layer can simulate a saturated layer. The permeable geotextile 5 between the two can ensure vertical flow of water, but prevent soil from falling. There are several perforations between the bottom of the cylinder 1 and the top of the groundwater simulation device. The diameter of the perforations is 1mm to 10mm, so that the seepage liquid can flow down to the groundwater simulation device. fall. The seepage injection port 3 is connected to a simulated seepage liquid storage tank 15 through a pipeline, and a control valve can be arranged on the pipeline.

The groundwater simulation device includes a box body 6 , a groundwater injection port 9 , a groundwater flow outlet 10 and a groundwater sampling port 11 . The box body 6 is the main body of the entire groundwater simulation device, the box body 6 is made of transparent plexiglass, and a stainless steel support frame is arranged on the periphery. The top of the box 6 and the bottom of the cylinder 1 are connected through the aforementioned perforations, so that the water flow between the two can migrate vertically through the gravel layer, thereby realizing the joint simulation of rainfall infiltration and water infiltration in the soil vadose zone. One side of the side wall of the box body 6 is provided with a groundwater injection port 9, and the other side is provided with a groundwater outflow port 10 and a groundwater sampling port 11, wherein the groundwater sampling port 11 can be uniformly arranged in multiple vertical directions along the side wall of the box body 6 as required. , in order to collect groundwater samples at different depths. The groundwater injection port 9 is connected to the first liquid storage tank 12 through the water inlet pipe, the groundwater outlet 10 is connected to the second liquid storage tank 13 through the water outlet pipe, and the water inlet pipe and the water outlet pipe are provided with a peristaltic pump 7, and the pipeline can be provided with a control valve. The water in the first liquid storage tank 12 can be driven into the tank 6 by the peristaltic pump 7 and then discharged into the second liquid storage tank 13 to simulate the flow of groundwater. Both the water inlet pipe and the water outlet pipe are preferably silicone tubes, which are respectively clamped in different peristaltic pumps 7, which can facilitate the control of the water flow velocity and the adjustment of the liquid level in the groundwater simulation device.

The artificial rainfall device 2 is located above the soil to be simulated filled in the soil column simulation device, and its inlet is connected to a simulated rainfall storage tank 14 through a pipeline, and a control valve can be set on the pipeline to control the opening and closing or intensity of rainfall. The monitoring device includes several integrated monitoring probes 8, which are respectively installed in the cylinder 1 at different heights of the soil to be simulated and inside the box 6, for monitoring the temperature, pH, dissolved oxygen and groundwater flow rate at each setting location. In the integrated monitoring probe 8, a temperature monitoring probe, a pH monitoring probe, a dissolved oxygen monitoring probe, and a water flow velocity monitoring probe can be integrated according to monitoring needs, for monitoring temperature, pH, dissolved oxygen, and water flow velocity. There are multiple integrated monitoring probes 8 evenly arranged from top to bottom in the soil in the cylinder body 1, and at least one is arranged inside the box body 6. The specific arrangement number is determined according to the size of the entire device and monitoring requirements. In this embodiment, three integrated monitoring probes 8 are arranged in the soil in the cylinder body 1 , and these three integrated monitoring probes 8 are integrated with a temperature monitoring probe, a pH monitoring probe and a dissolved oxygen monitoring probe for use in Real-time monitoring of temperature, pH, dissolved oxygen at different depths in soil aquifers. An integrated monitoring probe 8 is arranged inside the box body 6. The integrated monitoring probe 8 inside the box body 6 not only integrates temperature monitoring probes, pH monitoring probes, and dissolved oxygen monitoring probes, but also integrates water flow velocity monitoring probes. Probe for real-time monitoring of temperature, pH, dissolved oxygen and water flow velocity in groundwater. These probes can accurately monitor the environmental conditions of the soil-groundwater system of contaminated sites to support site pollution remediation process monitoring and post-assessment. Of course, the specific integrated probe type in each integrated monitoring probe 8 can also be adjusted according to the detection needs. Each integrated monitoring probe 8 can be connected to a data acquisition device 16 outside the device through a line. The data acquisition device 16 may be a central control computer for intuitive display, storage and analysis of data.

In addition, in order to facilitate control, each pipeline in the device of the present invention is provided with a valve for controlling the opening and closing of the pipeline. The cylinder body 1 in the present invention can be cylindrical, and its height-diameter ratio can be adjusted according to needs, the range can be 1:1-4:1, and of course other shapes are also possible.

A method for simulating restoration by utilizing the soil-groundwater integrated simulating restoration device of a polluted site as described above, comprising the following steps:

1) Collect soil samples in layers from the soil in the area to be studied, and carry out pretreatments such as uniform refinement and drying;

2) Fill the bottom of the cylinder 1 with gravel to simulate the water-saturated layer of the actual soil; lay a permeable geotextile 5 on the top of the gravel layer, and fill the pretreated layered soil samples in step 1) above the permeable geotextile 5 in turn. When filling, it can be filled in sequence according to the layering order of the original soil. The thickness of the soil filled in each layer can also be kept the same as the actual layer of soil, or the filling method of the soil can be adjusted according to the needs of the test. In addition, in order to ensure the stability of seepage, the total height of the filled soil should be higher than the top seepage injection port 3 opened on the side wall of the cylinder body 1, so that the water flow seeps into the soil, and the filled soil is used to simulate the actual soil aquifer;

3) Obtain actual groundwater samples from in-situ drilling in the studied area and inject them into the first storage tank 12, inject the pre-prepared simulated rainfall solution into the simulated rainfall storage tank 14, and inject the pre-prepared simulated seepage liquid into the simulated seepage storage tank 15;

4) According to the test requirements, the unit time precipitation is converted into the required rainfall intensity, and the simulated rainfall solution in the simulated rainfall storage tank 14 is uniformly leached into the upper surface of the soil according to the rainfall intensity by controlling the artificial rainfall device 2, and then Then penetrate vertically into the soil layer. Then, open the valve on the communication pipeline corresponding to the seepage injection port 3 on the cylinder body 1, and inject the simulated seepage liquid in the simulated seepage liquid storage tank 15 into the soil layer through the seepage injection port (3). The simulated seepage liquid should be kept constant during injection. positive pressure, so that the seepage flow can be formed smoothly. In addition, open the valve on the communication pipeline corresponding to the groundwater injection port 9 on the box body 6, and pump the actual groundwater collected in place in advance into the box body 6 by controlling the peristaltic pump 7;

5) With the progress of water injection, open the valve on the connection pipeline of the groundwater outlet (10) of the box (6), so that the water flow gradually flows out of the groundwater simulation device and enters the second liquid storage tank (13) to form a simulation of groundwater flow. At the same time, by controlling the flow rate of the peristaltic pump (7) on the water inlet pipe and the water outlet pipe, the water level of the groundwater flowing through the box (6) can be stabilized at the set value of the test to simulate the pollutants in the site under different conditions. Migration and transformation of soil-groundwater systems;

6) During the simulation process, the integrated monitoring probe (8) is used to monitor the temperature, pH, dissolved oxygen and groundwater flow velocity of soil and groundwater at different depths in real time; at the same time, through the soil sampling port (4) and the groundwater sampling port (11) Soil and groundwater samples were collected separately.

It can be seen that the soil-groundwater integrated simulation remediation device of the polluted site can accurately simulate the complex structure of the vadose zone, and at the same time, through the combination of parameters collected by different probes to analyze the samples collected from each sampling port, the soil/groundwater integration can be realized. Remediation simulation and restoration process monitoring and evaluation.

The above is only a preferred solution for the implementation of the present invention, and is not intended to limit the present invention. For those of ordinary skill in the art, any modifications, equivalent replacements, etc. made within the spirit and scope of the present utility model are all included in the protection scope of the present utility model.

Claims (9)

1. A polluted site soil-underground water integrated simulation restoration device is characterized by comprising a soil column simulation device, an underground water simulation device, an artificial rainfall device (2) and a monitoring device; the soil column simulation device is attached to and arranged above the underground water simulation device; the soil column simulation device comprises a cylinder body (1), a seepage injection port (3) and a soil sampling port (4), wherein a plurality of seepage injection ports (3) and a plurality of soil sampling ports (4) are respectively arranged at different heights on the side wall of the cylinder body (1), a gravel layer is filled at the bottom in the cylinder body (1), a permeable geotextile (5) is laid above the gravel layer, soil to be simulated is filled above the permeable geotextile (5), and the seepage injection port (3) is externally connected with a simulation seepage liquid storage tank (15) through a pipeline; the underground water simulation device comprises a box body (6), an underground water injection port (9), an underground water outflow port (10) and an underground water sampling port (11), wherein the top of the box body (6) is communicated with the bottom of the cylinder body (1) through a perforation, so that water flow between the box body and the cylinder body can vertically migrate through a gravel layer; one side of the side wall of the box body (6) is provided with an underground water inlet (9), and the other side is respectively provided with an underground water outlet (10) and an underground water sampling port (11); the underground water injection port (9) is externally connected with a first liquid storage tank (12) through a water inlet pipe, the underground water outlet (10) is externally connected with a second liquid storage tank (13) through a water outlet pipe, and peristaltic pumps (7) are arranged on the water inlet pipe and the water outlet pipe; the artificial rainfall device (2) is positioned above soil to be simulated filled in the soil column simulation device, and an inlet of the artificial rainfall device is externally connected with a simulated rainfall liquid storage tank (14) through a pipeline; the monitoring device comprises a plurality of integrated monitoring probes (8) which are respectively arranged at different heights of soil to be simulated in the cylinder body (1) and inside the box body (6) and are used for monitoring the temperature, pH, dissolved oxygen and groundwater flow speed of each setting position.

2. The soil-underground water integrated simulation restoration device for the polluted site as claimed in claim 1, wherein each pipeline is provided with a valve for controlling the opening and closing of the pipeline.

3. The polluted site soil-underground water integrated simulation restoration device according to claim 1, wherein the height-diameter ratio of the cylinder (1) is 1: 1-4: 1.

4. The soil-underground water integrated simulation restoration device for the polluted site as claimed in claim 1, wherein the diameter of the perforation between the top of the box body (6) and the bottom of the cylinder body (1) is 1 mm-10 mm.

5. The integrated simulated restoration device for soil-groundwater of a contaminated site as claimed in claim 1, wherein the diameter of the gravel in the gravel layer is larger than the diameter of the bottom perforation.

6. A polluted site soil-groundwater integrated simulation restoration device according to claim 1, wherein a plurality of the integrated monitoring probes (8) are uniformly arranged in the soil in the cylinder body (1) from top to bottom, and at least 1 monitoring probe is arranged inside the box body (6).

7. The soil-underground water integrated simulation restoration device for the polluted site according to claim 1, wherein a plurality of seepage injection ports (3) and soil sampling ports (4) are arranged and vertically and uniformly arranged along the side wall of the cylinder (1); the underground water sampling ports (11) are also arranged in a plurality of numbers and are vertically and uniformly arranged along the side wall of the box body (6).

8. The polluted site soil-underground water integrated simulation restoration device according to claim 1, wherein the box body (6) is made of transparent organic glass, and a stainless steel support frame is arranged on the periphery of the box body.

9. The soil-underground water integrated simulation restoration device for the polluted site as claimed in claim 1, wherein the integrated monitoring probe (8) comprises a temperature monitoring probe, a pH monitoring probe and a dissolved oxygen monitoring probe, and a water flow rate monitoring probe is further integrated in the integrated monitoring probe (8) positioned inside the box body (6).

Images