CN115112348A - Dynamic simulation experiment system and method for underground water circulating well - Google Patents
Dynamic simulation experiment system and method for underground water circulating well Download PDFInfo
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Abstract
The invention relates to the technical field of underground water circulating wells, and discloses a dynamic simulation experiment system and method for an underground water circulating well. A dynamic simulation experiment system of an underground water circulating well comprises a seepage groove, a base, a circulating well and a chemical injection well; the seepage groove comprises a rectangular shell with an open upper part and an aqueous medium arranged in the shell; the circulating well comprises a first round pipe vertically arranged at the center of the seepage groove, and the first round pipe is formed by connecting a lower solid pipe, a lower sieve pipe, a middle solid pipe, an upper sieve pipe and an upper solid pipe from bottom to top; a watertight diaphragm is horizontally arranged in the middle of the middle solid pipe; the injection well comprises a second round pipe arranged in the seepage groove. The invention can simulate the hydraulic circulation characteristics of the underground water circulation well under various different conditions, can accurately monitor and amplify the influence radius of the underground water circulation well, can simulate the repair experiment of the underground water circulation well under various different conditions, and provides theoretical basis and technical support for the research, popularization and application of the underground water circulation well repair technology.
Description
Technical Field
The invention relates to the technical field of underground water circulating wells, in particular to a dynamic simulation experiment system and method of an underground water circulating well.
Background
Groundwater is an important component of fresh water resources and plays a significant role in the development of human society, but with the development of the industry in China, the pollution of non-aqueous phase liquid (NAPL) represented by petroleum pollutants and the like to soil and groundwater is more and more serious.
Aiming at the organic pollutants in the underground water, the technology of the underground water circulation well (GCW) has the advantages of high removal efficiency, short repair period, easy control of secondary pollution and the like, and has huge development potential and wide application prospect. Over the years, a plurality of scientific researchers continuously develop research work for repairing organic pollutants by using underground water circulating wells, but the types of the underground water circulating wells suitable for different places are greatly different due to large differences of hydrogeological conditions, pollutant properties and the like of different underground water pollution places.
At present, the research and application of the GCW repair technology in China are still in the beginning stage, related research work is mostly limited to indoor experiments and numerical simulation, and no mature GCW repair technology application case exists. Although the numerical simulation is not limited by experimental conditions, the field boundary conditions and the properties of the water-containing medium are often simplified, so that the error of the simulation result is larger; and the structure discretization forms are different, the obtained results and precision are also different, and the randomness is relatively high.
In addition, research shows that the underground water circulating well is suitable for an aquifer with high horizontal permeability coefficient (more than 0.30m/d) and anisotropy of 3-10, and the circulating well cannot operate when the anisotropy of the aquifer is more than 10. As such, circulating groundwater wells often suffer from problems of too small an impact radius and too low contaminant remediation efficiency in low permeability aquifers. How to improve the influence radius of the circulating well and expand the hydraulic circulating range is one of the factors restricting the technical development of the circulating well at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a dynamic simulation experiment system and a method for an underground water circulating well, which can simulate the hydraulic circulation characteristics of the underground water circulating well under various conditions (different water-containing media, different underground water flow rates, different circulating well structures and different circulation modes), can accurately monitor and amplify the influence radius of the underground water circulating well, can simulate the repair experiment of the underground water circulating well under various conditions on organic pollutants of different properties, solve the problem that the dynamic repair process of the underground water circulating well on the organic pollutants cannot be comprehensively and accurately researched in the prior art, and have the advantages of reasonable structure, simplicity in operation, high efficiency and practicability.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A dynamic simulation experiment system of an underground water circulating well comprises a seepage groove, a base, a circulating well and a chemical injection well;
the seepage groove comprises a rectangular shell with an upper opening and an aqueous medium arranged in the shell; a first water outlet is formed in the upper end of the right wall of the shell, a first water inlet is formed in the lower end of the left wall of the shell, and a first water drainage port is formed in the position, close to the first water inlet, of the bottom of the shell; a first baffle is vertically arranged in the shell close to the first water outlet, a second baffle is vertically arranged in the shell close to the first water inlet, a plurality of holes are respectively formed in the first baffle and the second baffle, the lower ends of the first baffle and the second baffle are respectively fixedly connected with the upper surface of the bottom wall of the shell, the front side and the rear side of the first baffle and the second baffle are respectively fixedly connected with the front wall and the rear wall of the shell, the heights of the first baffle and the second baffle are flush with the first water inlet, and water supply compartments are respectively formed between the first baffle and the right wall of the shell and between the second baffle and the left wall of the shell; a plurality of second water outlets are formed in the front wall of the shell between the first baffle and the second baffle; a plurality of sampling ports are formed in the rear wall of the shell between the first baffle plate and the second baffle plate, sampling pipelines are arranged at the sampling ports, and valves are arranged on the sampling pipelines; the water inlet is respectively connected with the water outlets of the first peristaltic pump and the second peristaltic pump through connecting pipelines;
the base is arranged at the bottom of the shell, and the lower surface of the bottom wall of the shell is fixedly connected with the upper surface of the base; the upper surface of the base is also provided with a pressure measuring plate, and a plurality of pressure measuring pipes are vertically arranged on the pressure measuring plate; the second water outlets are respectively communicated with the lower ends of the pressure measuring pipes through pipelines;
the circulating well comprises a first circular pipe vertically arranged on the bottom surface of the seepage groove, a top cover is arranged at the top of the first circular pipe, and the bottom of the first circular pipe is closed; the first circular pipe is formed by connecting a lower solid pipe, a lower sieve pipe, a middle solid pipe, an upper sieve pipe and an upper solid pipe from bottom to top; the pipe walls of the lower solid pipe, the middle solid pipe and the upper solid pipe are watertight, and the pipe walls of the lower sieve pipe and the upper sieve pipe are provided with a plurality of water-permeable holes; a watertight diaphragm is horizontally arranged in the middle of the middle solid pipe; the center of the inner part of the first circular pipe is provided with a coaxial first pipeline, and the lower end of the first pipeline sequentially penetrates through the top cover and the transverse partition plate and extends downwards to the screen pipe; the lower end of the second pipeline penetrates through the top cover and extends downwards to the upper sieve pipe; the upper end of the first pipeline is connected with a water inlet of the circulating pump; the upper end of the second pipeline is connected with a water outlet of the circulating pump;
the medicine injection well comprises a second round pipe; the second pipe is vertically arranged on one side of the first pipe in the seepage groove, the bottom of the second pipe is sealed, the pipe wall of the second pipe is provided with a plurality of water-permeable sieve meshes, the medicine adding device further comprises a medicine adding pipe and a third peristaltic pump, the head end of the medicine adding pipe is connected with the output end of the third peristaltic pump, and the tail end of the medicine adding pipe extends into the second pipe.
Preferably, the number of the second water outlets is 50 respectively, the second water outlets are uniformly arranged in 5 rows from top to bottom, each row of the second water outlets is uniformly arranged in 10 rows from left to right, and the distance between every two adjacent second water outlets is 100 mm.
Preferably, the number of pressure measuring tubes is 50.
Preferably, the number of the sampling openings is 50, the sampling openings are uniformly arranged in 5 rows from top to bottom, 10 sampling openings are uniformly arranged in each row from left to right, and the distance between every two adjacent sampling openings is 100 mm.
Preferably, the base is a stainless steel bracket, and a sliding wheel is arranged on the outer side of the lower surface of the stainless steel bracket.
Preferably, the right side of first baffle and the left side of second baffle are provided with stainless steel screen cloth or nylon screen cloth respectively.
Preferably, the outer side walls of the first circular pipe and the second circular pipe are respectively provided with a stainless steel screen or a nylon screen.
Preferably, the aqueous medium comprises any one or more of coarse sand, medium sand, fine sand, silt or clay.
A dynamic simulation experiment method of an underground water circulating well comprises the following steps:
step 3, observing the water level change amplitude in each pressure measuring pipe after the circulation well operates stably, and calculating the influence radius of the circulation well by measuring the distance between two pressure measuring pipes which are obviously changed in water level in the same row and are farthest from the circulation well;
step 4, closing the circulating pump, starting the second peristaltic pump, releasing supersaturated solution of organic pollutants with known concentration from the first water inlet of the seepage tank, and simulating the migration process of the organic pollutants in different water-containing media;
step 5, closing the second peristaltic pump, sampling and determining the concentration of the pollutants in the second peristaltic pump; and starting the circulating pump to start the circulating well, starting the third peristaltic pump after the circulating well runs stably to convey the medicament to the aqueous medium, then closing the circulating pump and the third peristaltic pump, and sampling and analyzing the concentration of the pollutants in the underground water to obtain the repairing efficiency of the underground water circulating well for the organic pollutants.
Further preferably, the method also comprises a step 6 of replacing the circulating pump in the steps 1 to 3 with a variable frequency pump so as to adjust the circulating flow rate of the underground water in the water-containing medium; or externally connecting a high-pressure water gun in the steps 1 to 3, and directly applying high-pressure water generated by the high-pressure water gun to the water-containing medium 2 in the seepage tank 1 to change the porosity or permeability coefficient of the water-containing medium and perform an amplification simulation experiment on the influence radius of the underground water circulating well.
Compared with the prior art, the invention has the beneficial effects that:
the dynamic simulation experiment system and method for the underground water circulating well can accurately simulate the repair experiment of the underground water circulating well on various organic pollutants with different properties under various conditions (different water-containing media, different underground water flow rates, different circulating well structures and different circulating modes).
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic diagram of the overall structure of a simulation experiment system according to the present invention;
FIG. 2 is a left side view of the simulated experimental system;
FIG. 3 is a top view of a simulation experiment system;
FIG. 4 is a schematic diagram of the construction of a circulation well;
FIG. 5 is a schematic diagram of a drug injection well;
FIG. 6 is a schematic diagram of a three-dimensional elliptical flow field after the circulation well is stably operated;
the reference signs are: 1. the seepage flow groove, 2, a base, 3, a circulation well, 4, a medicine injection well, 11, a shell, 12, an aqueous medium, 13, a first water outlet, 14, a first water inlet, 15, a first water outlet, 16, a first baffle, 17, a second baffle, 18, a second water outlet, 19, a sampling port, 21, a pressure measuring plate, 22, a pressure measuring pipe, 31, a first circular pipe, 32, a transverse baffle, 33, a first pipeline, 34, a second pipeline, 35, a lower solid pipe, 36, a lower sieve pipe, 37, a middle solid pipe, 38, an upper sieve pipe, 39, an upper solid pipe, 41, a second circular pipe, 42, a water permeable sieve hole and 43, a medicine adding pipe.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
Referring to fig. 1, a schematic diagram of an overall structure of the simulation experiment system of the present invention is shown. Fig. 2 and 3 are a left side view and a top view, respectively, of the experimental system.
A dynamic simulation experiment system of an underground water circulating well comprises a seepage groove 1, a base 2, a circulating well 3 and a chemical injection well 4;
the seepage tank 1 comprises a rectangular shell 11 with an upper opening and an aqueous medium 12 arranged in the shell; the device also comprises a first peristaltic pump for adding water and a second peristaltic pump for adding pollutants; a first water outlet 13 is formed in the upper end of the right wall of the shell, a first water outlet pipe is arranged on the first water outlet 13, and a valve is arranged on the first water outlet pipe; a first water inlet 14 is formed in the lower end of the left wall of the shell, the first water inlet 14 is respectively connected with water outlets of the first peristaltic pump and the second peristaltic pump through a connecting pipeline, and a valve is arranged on the connecting pipeline; a first water outlet 15 is arranged at the bottom of the shell close to the first water inlet; be close to the vertical first baffle 16 that is provided with in first delivery port department in the casing, be close to the vertical second baffle 17 that is provided with in first delivery port department in the casing, be provided with a plurality of holes on first baffle and the second baffle respectively, in order to prevent that aqueous medium from getting into the water supply compartment, the right side of first baffle and the left side of second baffle are provided with stainless steel screen cloth or nylon screen cloth respectively.
The lower ends of a first baffle 16 and a second baffle 17 are respectively fixedly connected with the upper surface of the bottom wall of the shell, the front side and the rear side of the first baffle 16 and the second baffle 17 are respectively fixedly connected with the front wall and the rear wall of the shell, the heights of the first baffle 16 and the second baffle 17 are flush with the first water inlet, and water supply compartments are respectively formed between the first baffle and the right wall of the shell and between the second baffle and the left wall of the shell; the water outlet of the first peristaltic pump is connected with the first water inlet through a pipeline, distilled water is input into a water supply compartment between the first baffle and the left wall of the shell by the first peristaltic pump, and the distilled water drives air in pores of the water-containing medium gradually to soak the water-containing medium. In this example, distilled water was used to simulate groundwater.
A plurality of second water outlets 18 are formed in the front wall of the shell 11 between the first baffle 16 and the second baffle 17; the rear wall of the shell 11 between the first baffle 16 and the second baffle 17 is provided with a plurality of sampling ports 19, the sampling ports are provided with sampling pipelines, valves are arranged on the sampling pipelines, and the sampling ports are used for taking water samples and determining the concentration of pollutants in the water samples.
The base is arranged at the bottom of the shell 11, and the lower surface of the bottom wall of the shell 11 is fixedly connected with the upper surface of the base 2; the upper surface of the base 2 is also provided with a pressure measuring plate 21, and a plurality of pressure measuring pipes 22 are vertically arranged on the pressure measuring plate; the second water outlets 18 are respectively communicated with the lower ends of the pressure measuring pipes through pipelines; the pressure measuring pipe is used for displaying the water levels of the second water outlets, and the water level value of the pressure measuring pipe is recorded after the water level of the pressure measuring pipe is stable.
Specifically, the seepage groove is organic glass material, and the casing size is 1200mm x 400mm x 600mm, and the base is the stainless steel support of taking the movable pulley, and the seepage groove respectively has the water supply compartment that the width is 100mm in the left and right sides. In order to simulate different water-containing media, any one of coarse sand, medium sand, fine sand, silt or clay can be used for simulating a homogeneous groundwater aquifer, and a heterogeneous groundwater aquifer can also be simulated by different combinations of various water-containing media. The first water inlet can be connected with a first peristaltic pump capable of adjusting flow through a hose, so that different groundwater flow rates can be simulated. In this embodiment, the hose is latex tube.
Specifically, in order to realize the measurement of the influence radius of the underground water circulating well, 50 second water outlets are arranged on the front wall of the shell between the first baffle and the second baffle, 5 rows and 10 lines are formed in total, the distance is 100mm, the first water outlets are respectively arranged in 1-5 rows and 1-10 rows from top to bottom and from left to right, and 50 glass pressure measuring pipes are vertically arranged on the side pressure plates. The 50 second water outlets are communicated with the lower parts of the 50 glass pressure measuring pipes through latex pipes, and the top ends of the pressure measuring pipes are communicated with the atmosphere so as to discharge air in pores of the water-containing medium; the rear wall of the shell between the first baffle and the second baffle is provided with 50 sampling ports, 5 rows and 10 lines are arranged in total, the distance is 100mm, and 1-5 rows and 1-10 rows are respectively arranged from top to bottom and from left to right for taking a water sample and determining the concentration of pollutants in the water sample.
Referring to fig. 4, a schematic diagram of a circulation well is shown; the circulating well 3 comprises a first circular pipe 31 vertically arranged on the bottom surface of the seepage groove 1, the top of the first circular pipe 31 is provided with a top cover, and the bottom is closed; the first round pipe 31 is formed by connecting a lower solid pipe 35, a lower sieve pipe 36, a middle solid pipe 37, an upper sieve pipe 38 and an upper solid pipe 39 from bottom to top; the pipe walls of the lower solid pipe, the middle solid pipe and the upper solid pipe are watertight, and the pipe walls of the lower sieve pipe and the upper sieve pipe are provided with a plurality of water-permeable holes; the middle part of the middle solid pipe 37 is horizontally provided with a watertight diaphragm 32; a coaxial first pipeline 33 is arranged in the center of the inner part of the first circular pipe, and the lower end of the first pipeline 33 sequentially passes through the top cover and the diaphragm plate 32 and extends downwards to a screen pipe 36; a second pipe 34 is also included, the lower end of the second pipe 34 passes through the top cover and extends downwards to the upper sieve pipe 38; also comprises a circulating pump which is used for circulating the water,
the upper end of the first pipeline 33 is connected with a water inlet of the circulating pump; the upper end of the second pipeline 34 is connected with a water outlet of the circulating pump; the connection mode of the circulating pump can be changed. Wherein, the position of the first circular tube 31 in the seepage groove 1 can be moved according to the requirement.
Specifically, the circulating well adopts an organic glass circular tube with the diameter of 200-300 mm and the height of 600-900 mm, and the outer side wall of the organic glass circular tube is provided with a stainless steel screen or a nylon screen; in order to simulate circulating wells with different structures, the organic glass circular tube is designed to be formed by connecting 5 sections of independent circular tubes through buckles, and is respectively provided with a lower solid tube 35, a lower sieve tube 36, a middle solid tube 37, an upper sieve tube 38 and an upper solid tube 39 from bottom to top, wherein the tube walls of the lower solid tube, the middle solid tube and the upper solid tube are watertight, and the tube walls of the lower sieve tube and the upper sieve tube are provided with a plurality of water permeable holes; the upper sieve tube and the lower sieve tube can be provided with different sieve pore diameters or different pore intervals, and the upper sieve tube, the lower sieve tube, the upper solid tube and the lower solid tube can be selected with different heights, so that the positions and the number of the solid tubes and the sieve tubes of the circulating well can be changed.
The hydraulic circulation of the circulating well comprises a positive circulation mode and a reverse circulation mode, wherein the positive circulation mode is that the upper end of a first pipeline is connected with a water inlet of a circulating pump, the upper end of a second pipeline is connected with a water outlet of the circulating pump, and water flows in from a lower sieve tube and flows out from an upper sieve tube; the flow direction outside the well is from top to bottom, so that an elliptical flow field is formed around the circulating well; the reverse circulation mode is that the upper end of the second pipeline is connected with a water inlet of the circulating pump, and the upper end of the first pipeline is connected with a water outlet of the circulating pump, so that the flowing directions of water in and out of the well are opposite to the positive circulation. As shown in fig. 6, it is a schematic diagram of a three-dimensional elliptical flow field after the circulation well is stably operated. The hydraulic circulation operation mode of the circulation well can be switched by changing the connection mode of the circulation pump with the first pipeline and the second pipeline.
FIG. 5 is a schematic diagram of the structure of the injection well. The injection well 4 comprises a second circular tube 41; the second pipe 41 is vertically arranged on one side of the first pipe 31 in the seepage groove 1, the bottom of the second pipe 41 is sealed, the pipe wall of the second pipe is provided with a plurality of water-permeable sieve holes 42, the medicine adding pipe 43 and the third peristaltic pump 44 are further included, the head end of the medicine adding pipe is connected with the output end of the third peristaltic pump, and the tail end of the medicine adding pipe extends into the second pipe. Wherein the position of the second round tube 41 in the seepage groove 1 is movable.
Specifically, the injection well adopts an organic glass circular tube with the diameter of 100-200 mm and the height of 600-900 mm, a plurality of water-permeable sieve pores are arranged on the tube wall of the organic glass circular tube with the height of less than 550mm, and a stainless steel screen or a nylon screen is arranged on the outer side wall of the organic glass circular tube; the organic glass round tube can be provided with permeable sieve pores with different pore sizes or pore intervals.
A dynamic simulation experiment method of an underground water circulating well comprises the following steps:
in order to simulate different water-containing media, any one of coarse sand, medium sand, fine sand, silt or clay can be used for simulating a homogeneous groundwater aquifer, and a heterogeneous groundwater aquifer can also be simulated by different combinations of various water-containing media. Before filling sand, firstly determining the positions of a circulating well and a medicine injection well, and putting the circulating well and the medicine injection well; and then, filling the selected aqueous medium or aqueous medium combination layer by layer in a seepage tank, wherein the filling height is 550 mm. The water-containing medium is continuously tamped in the filling process, so that the medium is uniformly filled, and the circulating well and the medicine injection well are firmly fixed.
in this example, distilled water was introduced into the seepage tank to simulate groundwater. Specifically, the first water inlet is connected with the first peristaltic pump, so that distilled water is uniformly and slowly filled into the water supply compartment, air in pores of the water-containing medium is gradually displaced, when the top surface of the water-containing medium is completely wetted and thin-layer water overflows, the medium is completely saturated, and the water level of each piezometer pipe is kept flush at the moment. Different ground water flow rates can be simulated by adjusting the flow of the first peristaltic pump, and meanwhile, the valve of the first water outlet is controlled to enable the water level fluctuation amplitude of the water supply compartments on the two sides not to exceed 5 mm. And starting the circulating pump after the flow rate of the underground water is stable, starting the circulating well to run, and adding the same amount of tracer at the position 50mm below the upper surface of the water-containing medium along the horizontal direction at intervals of 100mm through the long needle tube. Due to the indicator effect of the tracer, the groundwater forms a visualized oval flow field around the circulating well, as shown in fig. 6, and the oval flow field is gradually enlarged along with the operation of the simulated circulating well.
The hydraulic circulation of the circulating well comprises a positive circulation mode and a reverse circulation mode, wherein the positive circulation mode is that the upper end of a first pipeline is connected with a water inlet of a circulating pump, the upper end of a second pipeline is connected with a water outlet of the circulating pump, and water flows in from a lower sieve tube and flows out from an upper sieve tube; the flow direction outside the well is from top to bottom, so that an elliptical flow field is formed around the circulating well; the reverse circulation mode is that the upper end of the second pipeline is connected with a water inlet of the circulating pump, and the upper end of the first pipeline is connected with a water outlet of the circulating pump, so that the flowing directions of water in the well and outside the well are opposite to the positive circulation; the hydraulic circulation operation mode of the circulation well can be switched by changing the connection mode of the circulation pump with the first pipeline and the second pipeline. By filling different aqueous media, changing the combination mode of the circulating well solid pipe and the sieve pipe and changing the running mode of the circulating well, the hydraulic circulation characteristics of the underground water circulating well under different conditions can be drawn.
Step 3, observing the water level change amplitude in each pressure measuring pipe after the circulation well operates stably, and calculating the influence radius of the circulation well by measuring the distance between two pressure measuring pipes which are obviously changed in water level in the same row and are farthest from the circulation well;
after the circulation well operates stably, the water level change amplitude in each pressure measuring pipe is different, the water level change amplitude of the pressure measuring pipe close to the circulation well is large, and the water level change of the pressure measuring pipe far away from the circulation well is small or even has no change. And measuring the distance between two pressure measuring pipes which are arranged in the same row and have obvious water level changes and are farthest from the circulating well, wherein half of the distance is the influence radius of the circulating well. In the simulation and repair experiment process of the underground water circulating well, the circulating well is opened, the water level value of each piezometer pipe is recorded after the water level of each piezometer pipe is basically stable, and the influence radius of the circulating well can be calculated.
Step 4, closing the circulating pump, starting the second peristaltic pump, releasing supersaturated solution of organic pollutants with known concentration from the first water inlet of the seepage tank, and simulating the migration process of the organic pollutants in different water-containing media;
and (3) closing the circulating pump, starting the second peristaltic pump after the flow rate of the underground water is stable, and releasing the supersaturated solution of the organic pollutants with known concentration into the water-containing medium at a certain speed through the first water inlet of the seepage tank. And during releasing the pollutants, taking water samples through sampling ports distributed on the back of the seepage tank at regular intervals and measuring the concentration of the pollutants in the water samples to obtain the migration rule of the organic matters in the underground water. By changing the types of the water-containing media filled in the seepage grooves or the released organic pollutants, the migration rules of the organic pollutants with different properties in different water-containing media can be obtained; furthermore, the influence of the groundwater flow speed on the transport law of pollutants in an aqueous medium can be analyzed by changing the flow rate of the first peristaltic pump connected to the first water inlet.
Step 5, closing the second peristaltic pump, and measuring the concentration of the pollutants in the second peristaltic pump; and starting the circulating pump to start the circulating well, starting the third peristaltic pump after the circulating well runs stably to convey the medicament to the aqueous medium, then closing the circulating pump and the third peristaltic pump, and sampling and analyzing the concentration of the pollutants in the underground water to obtain the repairing efficiency of the underground water circulating well for the organic pollutants.
And after the groundwater pollution is carried out for the expected time, the second peristaltic pump is closed, and a water sample is taken through the sampling port to determine the concentration of the pollutants in the water sample. And then starting a circulating pump to enable the circulating well to start running, and starting a third peristaltic pump after the circulating well runs stably to convey medicaments with known concentrations, such as an oxidation-reduction agent, a catalyst, a surfactant and the like at a slow speed. And after the system runs for a period of time, the circulating pump and the third peristaltic pump are closed, and after the groundwater level recovers to be stable, the sampling port samples and analyzes the concentration of pollutants in the groundwater. By comparing the change rule of the pollutant concentration of each sampling port before and after the circulation well is opened, the remediation efficiency of the underground water circulation well on the organic pollutants can be obtained.
Before the repair experiment is started, a forward/reverse circulation mode is determined according to the nature and distribution characteristics of pollutants. Light non-aqueous phase liquid (LNAPL) pollutants with specific gravity smaller than that of water are easy to gather at the upper part of the aquifer, and the circulation mode gives priority to reverse circulation, so that the pollutants at the upper part can be prevented from being carried and diffused to the lower part of the aquifer by positive circulation. Conversely, for heavy non-aqueous phase liquid (DNAPL) contaminants distributed in the lower part of the aquifer, the positive circulation mode is preferred.
Step 6, carrying out an amplification simulation experiment of the influence radius of the underground water circulating well; replacing the circulating pump in the steps 1 to 3 with a variable frequency pump to adjust the circulating flow rate of the underground water in the water-containing medium; or externally connecting a high-pressure water gun in the steps 1 to 3, and directly applying high-pressure water generated by the high-pressure water gun to the water-containing medium in the seepage tank so as to change the porosity or permeability coefficient of the water-containing medium and further change the circulating flow rate of the underground water in the water-containing medium.
Specifically, a circulating pump is replaced by a variable frequency pump, the influence radius of the circulating well before and after frequency conversion or before and after the action of high-pressure water jet is obtained, and the amplification simulation experiment result of the influence radius of the circulating well can be obtained through comparative analysis.
Example 1
And 2, connecting a first water inlet of the seepage tank with a first peristaltic pump to uniformly and slowly fill distilled water into the water supply compartment, wherein the flow rate of the first peristaltic pump is 10 ml/min. Air in the pores of the aqueous medium is gradually displaced to make the aqueous medium completely saturated with water; the water level in the seepage groove is 550mm at this moment. And opening the valve of the first water outlet, and adjusting the valve to ensure that the fluctuation range of the water level of the water supply compartments at two sides is not more than 5mm, wherein the water level of each piezometer pipe is kept flush and is 550 mm. And (3) connecting the upper end of the first pipeline with a water inlet of a circulating pump, connecting the upper end of the second pipeline with a water outlet of the circulating pump, starting the circulating pump to enable the underground water circulating well to start normal circulating work, and setting the flow of the circulating pump to be 30 ml/min. And when the circulation well runs stably, adding the soil non-adsorptive sodium fluorescein tracer solution along the long axis of the seepage tank by using the long needle tube, wherein the distance between every two adjacent adding points is 100mm, and the adding depth is 50mm away from the top of the aqueous medium. Through the running track of the fluorescein sodium tracer, the elliptical flow field formed by the underground water around the circulating well can be observed by naked eyes.
Step 3, after the circulation well operates stably, the water level change amplitude in each pressure measuring pipe is different, wherein the water level change amplitude of the pressure measuring pipes close to the circulation well in the 5 th row and the 6 th row is larger, the water level rising height of the pressure measuring pipe in the 5 th row and the 1 st row is 45mm at most, and the water level falling height of the pressure measuring pipe in the 5 th row and the 5 th row is 73mm at most; the water level of the piezometer tube of the No. 1 row in the No. 3 row is increased to 10mm, and the water level of the piezometer tube of the No. 5 row in the No. 3 row is decreased to 14 mm; the water level of the piezometer tube of the 8 th row and the 1 st row is increased to 8mm, and the water level of the piezometer tube of the 5 th row is decreased to 11 mm; while there is substantially no change in the piezometric water levels in columns 1, 2 and 9, 10 away from the recycle well. According to the influence radius of the circulation well, 1/2 of the distance between two pressure measuring pipes which are obvious in water level change and farthest from the circulation well in the same row is used as the influence radius of the circulation well, the influence radius of the circulation well is 250mm under the experimental conditions that the flow rate of underground water is 10ml/min, the flow rate of the circulation well is 30ml/min, the heights of upper and lower sieve pipes of the circulation well are 70mm, and the distance between the two sieve pipes is 380 mm.
And 4, closing the circulating pump, starting the second peristaltic pump after the circulating well stops running, and releasing the supersaturated solution of benzene with the concentration of 1800mg/L through the first water inlet of the seepage tank, wherein the release rate is synchronous with the flow rate of underground water and is 10 ml/min. The release of pollutants is continuously carried out for 50d, sampling is carried out at the sampling ports at intervals of 5d, the concentrations of benzene in water samples at different sampling ports are measured by using an Shimadzu GC-2010 type gas chromatography analyzer, and the migration rule of the benzene in underground water is analyzed.
By analyzing the change rule of the concentration of the benzene along with time, the benzene can be known to be transferred horizontally and vertically after entering the underground water. In the first 10d, only the benzene concentration in the range of 300mm from the water inlet was measured. The benzene concentration in the sampling port farther from the release point gradually increased with the increase of the release time, indicating that the contaminated zone formed by benzene in the groundwater gradually expanded. At the 40 th day of release, benzene concentration was measured in all the sampled water samples taken from the sampling ports and the contamination had covered substantially the entire flow cell. When the contamination proceeded to the end of 50 days, the benzene concentration in all the water samples was 99.5mg/L at the highest concentration and 45.03mg/L at the average concentration.
And 5, after the groundwater pollution is carried out for 50d, closing the second peristaltic pump. The density of the benzene is smaller than that of water, and the benzene belongs to light non-aqueous phase fluid (LNAPL), a water inlet of the circulating pump is connected with the upper end of the second pipeline, a water outlet of the circulating pump is connected with the upper end of the first pipeline, the circulating pump is started, and the operation mode of the circulating well is adjusted to be reverse circulation. Starting a third peristaltic pump after the circulation well runs stably, setting the flow rate at 5ml/min, and conveying potassium permanganate KMnO with the concentration of 500mg/L to the water-containing medium 4 The solution is added, and the timing is started, and the circulation is stopped every 1hAnd (5) operating the ring well and the injection well, and taking a water sample from the sampling port to determine the concentration of the pollutants. With the prolonging of the reaction time, the concentration of the pollutants in each sampling port is gradually reduced, after the accumulative reaction is carried out for 9 hours, most of water samples cannot detect benzene, and only the individual sampling port at the bottom of the seepage tank and farthest from the circulating well can detect the benzene with the concentration of 3mg/L, so that the pollutants are fully and effectively degraded, and the degradation rate can reach 93.34-100%.
And 6, replacing the circulating pump in the steps 1 to 3 with a frequency-adjustable variable frequency pump, firstly setting the frequency of the variable frequency pump to be 25Hz, setting the circulating flow rate of the variable frequency pump to be 30ml/min under the frequency, setting the flow rate of the first peristaltic pump to be 10ml/min, and measuring the influence radius of the circulating well to be 250mm under the experimental conditions that the heights of an upper sieve tube and a lower sieve tube of the circulating well are both 70mm and the distance between the two sieve tubes is 380 mm.
And then keeping the flow rate of the first peristaltic pump at 10ml/min, increasing the frequency of the variable frequency pump to 40Hz, wherein the circulation flow rate at the frequency is 70ml/min, and the influence radius of the circulation well is measured to be 350mm under the experimental conditions that the heights of the upper sieve tube and the lower sieve tube of the circulation well are both 70mm and the distance between the two sieve tubes is 380 mm.
And (3) externally connecting a high-pressure water gun in the steps 1 to 3, measuring the pressure of the water gun to be 50bar after the water pressure of a water outlet is stable, and directly acting the jetted high-pressure water in the water-containing medium. Wherein, the high-pressure squirt shower nozzle is laminated with aqueous medium top surface, acts on a point every 100mm along the infiltration groove major axis direction, and the action time of each point is 10 min. And then measuring the influence radius of the circulating well under the experimental condition that the flow rate of underground water is 10ml/min, the flow rate of the circulating well is 30ml/min, the heights of the upper sieve tube and the lower sieve tube of the circulating well are both 70mm and the distance between the two sieve tubes is 380mm under the experimental condition.
By comparing the influence radius of the circulating well before and after frequency conversion and speed regulation and before and after high-pressure jet action, the influence radius of the circulating well is expanded from 250mm to 350mm under the condition of consistent other experimental conditions.
The device can accurately simulate the repair experiment of the underground water circulating well under various different conditions, has various functions, can comprehensively and accurately simulate the dynamic repair process of the underground water circulating well on organic pollutants, can accurately monitor and amplify the influence radius of the underground water circulating well, and can provide theoretical basis and technical support for the research and popularization and application of the underground water circulating well repair technology.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A dynamic simulation experiment system of an underground water circulating well is characterized by comprising a seepage groove (1), a base (2), a circulating well (3) and a chemical injection well (4);
the seepage groove (1) comprises a rectangular shell (11) with an upper opening and a water-containing medium (12) arranged in the shell; a first water outlet (13) is formed in the upper end of the right wall of the shell, a first water inlet (14) is formed in the lower end of the left wall of the shell, and a first water drainage opening (15) is formed in the bottom of the shell, close to the first water inlet; a first baffle (16) is vertically arranged at a position close to the first water outlet in the shell, a second baffle (17) is vertically arranged at a position close to the first water inlet in the shell, a plurality of holes are respectively formed in the first baffle and the second baffle, the lower ends of the first baffle (16) and the second baffle (17) are respectively fixedly connected with the upper surface of the bottom wall of the shell, the front side and the rear side of the first baffle (16) and the rear side of the second baffle (17) are respectively fixedly connected with the front wall and the rear wall of the shell, the heights of the first baffle (16) and the second baffle (17) are flush with the first water inlet, and water supply compartments are respectively formed between the first baffle and the right wall of the shell and between the second baffle and the left wall of the shell; a plurality of second water outlets (18) are formed in the front wall of the shell (11) between the first baffle plate (16) and the second baffle plate (17); a plurality of sampling ports (19) are arranged on the rear wall of the shell (11) between the first baffle plate (16) and the second baffle plate (17), sampling pipelines are arranged at the sampling ports, and valves are arranged on the sampling pipelines; the device also comprises a first peristaltic pump for adding water and a second peristaltic pump for adding pollutants, wherein the first water inlet (14) is respectively connected with the water outlets of the first peristaltic pump and the second peristaltic pump through connecting pipelines;
the base (2) is arranged at the bottom of the shell (11), and the lower surface of the bottom wall of the shell (11) is fixedly connected with the upper surface of the base (2); the upper surface of the base (2) is also provided with a pressure measuring plate (21), and a plurality of pressure measuring pipes (22) are vertically arranged on the pressure measuring plate; the second water outlets (18) are respectively communicated with the lower ends of the pressure measuring pipes through pipelines;
the circulating well (3) comprises a first circular pipe (31) vertically arranged on the bottom surface of the seepage groove (1), a top cover is arranged at the top of the first circular pipe, and the bottom of the first circular pipe is closed; the first round pipe (31) is formed by connecting a lower solid pipe (35), a lower sieve pipe (36), a middle solid pipe (37), an upper sieve pipe (38) and an upper solid pipe (39) from bottom to top; the pipe walls of the lower solid pipe, the middle solid pipe and the upper solid pipe are watertight, and a plurality of water permeable holes are formed in the pipe walls of the lower sieve pipe and the upper sieve pipe; a watertight diaphragm plate (32) is horizontally arranged in the middle of the middle solid pipe (37); a coaxial first pipeline (33) is arranged in the center of the inner part of the first circular pipe, and the lower end of the first pipeline (33) sequentially penetrates through the top cover and the diaphragm plate (32) and extends downwards to a screen pipe (36); the lower end of the second pipeline (34) penetrates through the top cover and extends downwards to an upper sieve pipe (38); the upper end of the first pipeline (33) is connected with a water inlet of the circulating pump; the upper end of the second pipeline (34) is connected with a water outlet of the circulating pump;
the medicine injection well (4) comprises a second round pipe (41); second pipe (41) are vertical to be set up in one side of first pipe (31) in seepage flow groove (1), and second pipe (41) bottom is sealed, second pipe wall is provided with a plurality of sieve meshes (42) that permeate water, still includes with medicine pipe (43) and third peristaltic pump, add medicine pipe head end with the output of third peristaltic pump is connected, and the end that adds the medicine pipe stretches into in the second pipe.
2. A dynamic simulation experiment system for a groundwater circulation well according to claim 1, wherein the number of the second water outlets (18) is 50, the second water outlets are uniformly arranged in 5 rows from top to bottom, each row of the second water outlets (18) is uniformly arranged in 10 rows from left to right, and the distance between every two adjacent second water outlets (18) is 100 mm.
3. A dynamic simulation experiment system of a ground water circulation well according to claim 1, wherein the number of the pressure measuring pipes (22) is 50.
4. A dynamic simulation experiment system for a groundwater circulation well according to claim 1, wherein the number of the sampling ports (19) is 50, the sampling ports are uniformly arranged in 5 rows from top to bottom, each row of the sampling ports is uniformly arranged in 10 rows from left to right, and the distance between two adjacent sampling ports is 100 mm.
5. A dynamic simulation experiment system for a groundwater circulation well according to claim 1, wherein the base is a stainless steel bracket, and a sliding wheel is arranged on the outer side of the lower surface of the stainless steel bracket.
6. A dynamic simulation experiment system of a groundwater circulation well according to claim 1, wherein a stainless steel screen or a nylon screen is respectively arranged on the right side of the first baffle plate and the left side of the second baffle plate.
7. A dynamic simulation experiment system of a groundwater circulation well according to claim 1, wherein the outer side walls of the first round pipe (31) and the second round pipe (41) are respectively provided with a stainless steel screen or a nylon screen.
8. A dynamic simulation experiment system of a groundwater circulation well according to claim 1, wherein the aqueous medium (12) comprises any one or more of coarse sand, medium sand, fine sand, silt or clay.
9. A dynamic simulation experiment method of an underground water circulating well is characterized by comprising the following steps:
step 1, putting a circulation well and a medicine injection well into a seepage groove, and then filling a water-containing medium into the seepage groove;
step 2, starting a first peristaltic pump to feed water simulation underground water into the seepage groove, starting a circulating pump to start a circulating well after the water-containing medium is saturated with water, adding equal amount of tracer agents at the position 50mm below the upper surface of the water-containing medium along the horizontal direction every 100mm, and tracing and depicting the hydraulic circulation characteristics of the underground water in the circulating well;
step 3, observing the water level change amplitude in each pressure measuring pipe after the circulation well runs stably, and calculating the influence radius of the circulation well by measuring the distance between two pressure measuring pipes which are obviously changed in water level in the same row and are farthest from the circulation well;
step 4, closing the circulating pump, starting the second peristaltic pump, releasing supersaturated solution of organic pollutants with known concentration from the first water inlet of the seepage tank, and simulating the migration process of the organic pollutants in different water-containing media;
step 5, closing the second peristaltic pump, sampling and determining the concentration of the pollutants in the second peristaltic pump; and starting the circulating pump to start the circulating well, starting the third peristaltic pump after the circulating well runs stably to convey the medicament to the aqueous medium, then closing the circulating pump and the third peristaltic pump, and sampling and analyzing the concentration of the pollutants in the underground water to obtain the repairing efficiency of the underground water circulating well for the organic pollutants.
10. The method for simulating the dynamic state of the underground water circulating well according to the claim 9, characterized in that the method further comprises the step 6 of replacing the circulating pump in the steps 1 to 3 with a variable frequency pump to adjust the circulating flow rate of the underground water in the water-containing medium; or externally connecting a high-pressure water gun in the steps 1 to 3, and directly applying high-pressure water generated by the high-pressure water gun to the water-containing medium in the seepage tank so as to change the porosity or permeability coefficient of the water-containing medium and perform an amplification simulation experiment on the influence radius of the underground water circulating well.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115710039A (en) * | 2022-11-25 | 2023-02-24 | 吉林大学 | Circulating well repairing system and method |
| CN116177637A (en) * | 2023-02-20 | 2023-05-30 | 长安大学 | Repairing system and method for ultrasonic-assisted reinforced underground water circulating well |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115710039A (en) * | 2022-11-25 | 2023-02-24 | 吉林大学 | Circulating well repairing system and method |
| CN115710039B (en) * | 2022-11-25 | 2024-03-19 | 吉林大学 | Circulating well repairing system and method |
| CN116177637A (en) * | 2023-02-20 | 2023-05-30 | 长安大学 | Repairing system and method for ultrasonic-assisted reinforced underground water circulating well |
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