WO2023124090A1 - Pollutant migration soil column apparatus used for plastic concrete, and test method thereof - Google Patents

Abstract

Provided are a pollutant migration soil column apparatus used for plastic concrete and a test method thereof, comprising: air is compressed by an air compressor (1) and then enters an air storage tank (3), and high-pressure gas passes through an air filter (5); by means of inputting an electrical signal, controlling an electrical proportioning valve (10) so as to control the output air pressure; inputting the adjusted air pressure into a gas–liquid conversion apparatus, achieving conversion of air pressure to hydraulic pressure, pollution liquid is contained in the upper portion of a liquid-pollution liquid conversion apparatus, the lower portion of the liquid-pollution liquid conversion apparatus is connected to the gas–liquid conversion apparatus, and conversion of oil to pollution liquid is achieved; a pollution liquid concentration blending apparatus is provided with a pure solvent and a low- and high-concentration solution storage tanks, and blending of any pollutant concentration is achieved by means of control of a flow pump (54); the upper part of a soil column shower apparatus (17) is connected to a pollution liquid, a plastic concrete soil sample (21) is placed in the soil column, and the lower part of the soil column shower apparatus (17) is connected to a differential pressure sensor (20) and an effluent storage chamber (18). By means of the apparatus and method, the migration of pollutants in plastic concrete under different heads is realized.

Description

A pollutant migration soil column device for plastic concrete and its test method technical field

The invention belongs to the technical field of geotechnical tests, and relates to a soil column device for the migration of pollutants in plastic concrete and a test method thereof, in particular, relates to the removal of pollutants in plastic concrete (soil body or concrete with a very low permeability coefficient) Migration tests, especially involving pollutant migration test devices under different water heads (high or extremely high water heads), can explore the migration laws of pollutants under different high water heads.

Background technique

Antifouling barriers are installed at the bottom and around the solid waste landfill to prevent leachate from seeping and spreading to pollute the surrounding groundwater and soil. Plastic concrete, as a commonly used antifouling barrier material, has been applied in solid waste landfill treatment. The migration of pollutants in antifouling barriers is affected by various physical, chemical and biological reactions, and is a complex process, including convection, molecular diffusion, mechanical dispersion, adsorption, dissolution, precipitation and other effects. Usually, when evaluating the service performance of anti-fouling barriers, the migration of pollutants is simplified as the problem of convection, dispersion and adsorption of pollutants. In order to obtain the convection, dispersion and adsorption parameters of pollutants in antifouling barrier materials, the common method is to use indoor experiments. Soil column test is an effective method to obtain the above parameters. Due to the low permeability coefficient of the plastic concrete anti-fouling barrier, the migration speed of pollutants in it is very slow. The conventional soil column shower test uses a Martens flask as a constant water head method, which cannot meet the requirements of the test. In order to quickly and accurately obtain the parameters of pollutants in the plastic concrete antifouling barrier, a device that can stably provide a constant high water head is needed. At the same time, in order to explore the migration of pollutants in plastic concrete under different higher water heads, it is necessary to independently control the upstream water head and conduct multiple experiments at the same time.

At present, in domestic pollutant migration tests, few people have explored the migration of pollutants in extremely low-permeability samples (plastic concrete or concrete) under extremely high water heads, and there is a lack of research on pollutants under extremely low water heads. The test device for migration in the permeability sample lacks special test equipment for plastic concrete.

Contents of the invention

Purpose of the invention: the purpose of the present invention is to provide a soil column device for the migration of pollutants in plastic concrete and its test method, which realizes the soil pollution by using an air compressor, an air storage tank, an electrical proportional valve and a gas-liquid conversion tank. The high-precision intelligent control of the upstream water head of the column shower device and the pressure of the extremely high water head are used to explore the migration of pollutants in plastic concrete under the action of different water heads (including extremely high water heads). At the same time, a sensor is used downstream of the soil column device to monitor the change of the shower fluid in real time.

Technical solution: a pollutant migration soil column device for plastic concrete according to the present invention,

Including air supply device, air pressure control device, gas-liquid conversion device, liquid-pollution liquid conversion device, pollution liquid concentration adjustment device, soil column shower device and effluent liquid storage monitoring device;

The air supply device includes an air compressor (1) and an air storage tank (3), and the air compressor (1) and the air storage tank (3) are equipped with interconnected high-pressure air pipes, and the interconnected Variable-diameter adapters (2) are installed between the high-pressure gas pipes;

A vent pipe (25) is installed on the output end of the gas tank (3); the other end of the vent pipe (25) is connected to the gas-liquid conversion device through the air pressure control device;

A decompression valve (4) and an air filter (5) are also installed on the air pipe (25).

Further, the air pressure control device includes a potentiometer (8), a single-pole double-throw switch (9), an electrical proportional valve (10), a tee joint one (11) and a valve one (12);

The gas-liquid conversion device includes at least three gas-liquid conversion cylinders (13);

Three described gas-liquid conversion cylinders (13) are respectively connected on the vent pipe (25) by pipelines,

A valve one (12) is installed between the gas-liquid conversion cylinder (13) and the pipeline, and a tee joint one (11) is installed between the other end of the pipeline and the vent pipe (25);

Electric proportional valves (10) are all installed on the three described pipelines and connected vent pipes (25), and one end of the electric proportional valves (10) is installed on the pipelines, and the electric proportional valves The other end of (10) is arranged on the described vent pipe (25), and a potentiometer (8) is installed through a single-pole double-throw switch (9) at its extended end;

Three described single-pole double-throw switches (9) are summarized into a bus line and connected to one end of the computer (22) for controlling and collecting and displaying data through the wired lines installed respectively;

Pipelines are installed at the other ends of the three gas-liquid conversion cylinders (13), and the other ends of the pipelines are connected to the liquid-contaminated liquid conversion device;

An instrument case (14) is installed outside the air pressure control device and the gas-liquid conversion device, and an oil filling tank support frame (7) is also installed on the instrument case (14). An oil filling tank (6) is installed on the oil tank support frame (7),

A water main pipe is installed at the bottom of the oil filling tank (6), and the water main pipe is respectively connected to the pipes of the gas-liquid conversion cylinder (13) after passing through the box body through three bifurcated sub-water pipes. on the way.

Further, the gas-liquid conversion cylinder (13) includes a cylinder (31) of a cylindrical gas-liquid conversion device, and gas-liquid conversion cylinders are installed at both ends of the cylinder (31) of the gas-liquid conversion device. The stainless steel upper cover (27) of the device and the stainless steel lower cover (28) of the gas-liquid conversion device are provided with bolt holes on the stainless steel upper cover (27) of the gas-liquid conversion device (27) and the stainless steel lower cover (28) of the gas-liquid conversion device. A pull bolt one (29-1) is pierced in the bolt hole, and the pull bolt one (29-1) is installed on the stainless steel of the gas-liquid conversion device through the sleeve set screw one (30-1). On the cover (27) and the stainless steel lower cover (28) of the gas-liquid conversion device;

An o-shaped sealing ring-( 32-1).

Further, the liquid-contaminated liquid conversion device includes a liquid-contaminated liquid conversion cylinder (16), and the liquid-contaminated liquid conversion cylinder (16) includes the upper column (37) of the liquid-contaminated liquid conversion device and the liquid-contaminated liquid conversion cylinder (16). The lower cylinder (38) of the liquid conversion device, the upper cylinder (37) of the liquid-contaminated liquid conversion device and the lower cylinder (38) of the liquid-contaminated liquid conversion device are respectively equipped with liquid-contaminated liquid conversion The device stainless steel upper cover (33) and the stainless steel lower cover (34) of the liquid-polluted liquid conversion device;

Bolt holes are provided on the stainless steel upper cover (33) of the liquid-contamination liquid conversion device and the stainless steel lower cover (34) of the liquid-contamination liquid conversion device, and two pull bolts (29) are pierced in the bolt holes. -2), the two pull bolts (29-2) are installed on the stainless steel upper cover (33) of the liquid-pollution liquid conversion device and the liquid-pollution liquid conversion through the set screw two (30-2). Install the stainless steel lower cover (34);

A vent hole is also installed on the stainless steel upper cover (33) of the liquid-contaminated liquid conversion device, and a vent hole screw plug (35) is arranged in the vent hole;

A flexible isolation membrane (36) that has no chemical reaction with pollutants is installed between the upper column (37) of the liquid-contaminated liquid conversion device and the lower column (38) of the liquid-contaminated liquid conversion device;

The stainless steel upper cover (33) of the liquid-contamination liquid conversion device, the stainless steel lower cover (34) of the liquid-contamination liquid conversion device and the upper cylinder (37) of the liquid-contamination liquid conversion device and the liquid-contamination liquid conversion device The joints of the lower cylinder (38) are all sleeved with two o-shaped sealing rings (32-2).

Further, the pollution liquid concentration adjustment device includes a pollution liquid mixing tank (57), and a high-concentration pollution liquid injection tank (24) is connected to one end of the pollution liquid mixing tank (57) through a pipeline. The other end of the polluted liquid mixing box (57) is connected to a solvent injection tank (53) through a pipeline, and a low-concentration polluted liquid injection tank (52) is connected to the central end of the polluted liquid mixing box (57) through a pipeline;

A flow pump (54) is installed at the connection between the pipeline and the high-concentration pollution liquid injection tank (24), the solvent injection tank (53) and the low-concentration pollution liquid injection tank (52);

At least two solution agitators (55) are also installed inside the polluted liquid mixing box (57);

A main pipe is also installed at the bottom of the polluted liquid mixing tank (57), and the extension end of the main pipe is connected with three liquid pipes (26) through the four-way joint (15) installed. The other end of the liquid pipe (26) is connected on the described earth column shower device (17);

Thin pipes are also installed on the upper end of the liquid-contaminated liquid conversion cylinder (16), and the other ends of the thin pipes are respectively installed on the three liquid pipes (26). A valve two (12-2) is installed at the joint of the liquid pipe (26) respectively;

A solution two-way valve (56) is also installed on the main pipeline.

Further, the soil column shower device (17) includes a soil column shower device stainless steel base (40), and a soil column shower device column (47) is installed on the stainless steel base (40). The top of the shower device cylinder (47) is equipped with an earth column shower device stainless steel upper cover (39);

The bottom connection band (60) connected with the stainless steel base (40) of the soil column shower device is installed at the bottom of the column body (47) of the soil column shower device, and the bottom connection band (60) There are also at least three fixing bolt holes on the stainless steel base (40) of the soil column shower device;

A fixed connecting bolt (43) is pierced in the fixing bolt hole, and a fixing screw (30-4) is sleeved on the fixed connecting bolt (43);

A support column (41) for supporting the soil column shower device (17) is also pierced at the bottom end of the stainless steel base (40);

A valve three (12-3) is also installed on the stainless steel upper cover (39) of the soil column shower device, and a pressure gauge (46) is also installed on one side of the valve three (12-3);

In the central position of the stainless steel base (40) of the soil column shower device, a groove with a height of 1 cm is also installed,

Install drainage strips (44) and permeable stones (42) in the interior of the groove,

A connected small hole is provided at the center of the bottom drainage belt (44), the stainless steel base of the soil column shower device (40) and the groove, and a connected water outlet (45) is provided at the small hole;

Also be equipped with water stop clip two (59) at described water outlet (45);

An o-shaped sealing ring three (32-3) is also installed between the permeable stone (42) and the stainless steel base (40) of the earth column shower device;

Fill with plastic concrete soil sample (21) inside described soil column shower device cylinder (47), also be coated with between described plastic concrete soil sample (21) and soil column shower device cylinder (47) Crystal glaze glue (58).

Further, a test platform (23) is also installed at the lower end of the instrument case (14) including the air pressure control device and the gas-liquid conversion device, and the liquid-contaminated liquid conversion device, and the test platform (23) ) is equipped with an effluent storage monitoring device on the side wall;

The effluent storage monitoring device is connected to the water stop clip two (59) of the water outlet (45) of the soil column shower device (17) through a pipeline.

Further, the effluent storage monitoring device includes an elongated glass tube (19) that is placed on the test platform (23), and a tee that is installed at the bottom end of the elongated glass tube (19) Joint two (11-2) is connected with differential pressure sensor (20);

The other end of the water outlet (45) is connected to the tee joint two (11-2) of the elongated glass tube (19);

The lower end of the elongated glass tube (19) is also connected to an outflow liquid storage chamber (18) through a liquid flow pipe, and a water stop clamp (51) is also clamped on the liquid flow pipe;

One end of the effluent storage chamber (18) is respectively equipped with a conductivity sensor (48), a pH sensor (49) and a chloride ion concentration measurement sensor (50);

The conductivity sensor (48), pH sensor (49) and chloride ion concentration measurement sensor (50) are respectively connected to the other end of the computer (22) for controlling and collecting and displaying data through connected wired lines.

Further, a test method for a pollutant migration soil column device for plastic concrete, the specific operation steps are as follows:

(1) Assemble the pollutant migration test device, connect the various pipes of the device, and check the connection of each part of the device and the airtightness of each part of the entire device;

(2), the soil column shower device (17) is disassembled, put into clean water and wipe dry after cleaning;

(3), close the water stop clip two (59) under the stainless steel base (40) of the soil column shower device (17), place a permeable stone (42) and a filter paper on the base, and place the o-shaped Sealing ring three (32-3) is placed around the permeable stone (42);

(4), fix the bottom connecting band (60) of the column body (47) of the soil column shower device to the stainless steel base (40) of the soil column shower device through the fixed connection bolt (43) and the set screw (30-4) Above, fix the column body (47) of the soil column shower device on the stainless steel base (40), fill the configured plastic concrete soil sample (21) into the column body (47) of the soil column shower device, and fill each section, Using tools to mix the plastic concrete soil sample (21) evenly distributed until reaching the desired height;

(5), pass the upper cover (39) of the soil column shower device, the column body (47) of the soil column shower device and the stainless steel base (40) of the soil column shower device through the pull bolt (29-3) and the pull screw (30 -3) Connect and fix as a whole, put the soil column shower device (17) into a curing room with a temperature of 20° C. and a humidity of 95% for a specified time;

(6), the solid plastic concrete soil sample (21) that curing finishes is pushed out from the column body (47) of the soil column shower device, and smears crystal glaze glue (58) around the plastic concrete soil sample (21), and then Push the plastic concrete soil sample (21) into the original position in the soil column shower device (17), and place it for three days to wait for the colloid to solidify;

(7), inject hydraulic oil from the bottom of the gas-liquid conversion device, and stop at 90% of the conversion device;

(8), by calculation, the flow velocity of three flow pumps (54) of the pollution liquid concentration adjustment device is set, and the pollution liquids of different concentrations are mixed in the pollution liquid mixing tank (57), and the fixed target concentration of the configuration is obtained. contaminated liquid;

(9) Inject the prepared contaminated liquid into the upper part of the conversion device through the upper valve of the liquid-contaminated liquid conversion device until the air in the upper part of the device is exhausted;

Check the connecting pipe and exhaust all the air in the connecting pipe;

(10), connect the water inlet of the soil column shower device (17) with the liquid-contaminated liquid device, adjust the electric proportional valve through the computer (22) for controlling and collecting and displaying data, set the target water head size, and start the air supply device , three soil column shower devices (17) are injected with the solution of pollutants, and the air in the column is exhausted through the exhaust holes of the loam cake to close the exhaust holes;

(11), record the amount of water discharged from the drainpipe by the differential pressure sensor (20), measure the chemical parameters of the liquid in the corresponding liquid storage chamber by the conductivity, pH, and ion concentration measuring instrument, and complete the pollutants in the plastic concrete soil under different water heads Migration test in the sample (21); the liquid in the contaminated liquid mixing box (57) is collected by a sealed test tube for later detection needs;

(12), complete the test, remove the soil column shower device (17), use the automatic hydraulic jacking device to push out the plastic concrete soil sample (21) from the column body (47) of the soil column shower device, and measure its different depths Take out the contaminated liquid in the liquid-contaminated liquid conversion tank and put it into the chemical collection bucket for centralized treatment.

Beneficial effects: Compared with the prior art, the present invention has the following characteristics: 1) The present invention provides a soil column device for pollutant migration in plastic concrete, including an air supply device, an air pressure control device, and a gas-liquid conversion device. The device and liquid are a polluted liquid conversion device, a polluted liquid concentration adjusting device, a soil column shower device and a shower liquid collecting and monitoring device. Through the adjustment of the air pressure by the air pressure control device, the high precision control of the hydraulic pressure is realized; 2), due to the use of the compressor, the air storage tank and the air filter, it can provide higher and more stable pressure. For the very low soil body of plastic concrete this permeability coefficient, the present invention can provide the pressure of high water head, can simulate pollutants to migrate in plastic concrete under high water head in the laboratory, more consistent with actual situation; 3), this Invention that each shower soil column is equipped with an air pressure control device, which realizes independent control of multiple soil columns, and can simultaneously perform shower tests under multiple groups of different water heads; 4), the gas-liquid conversion device of the present invention, liquid-pollution liquid conversion Both the device and the soil column shower device are made of high-strength corrosion-resistant stainless steel upper and lower covers fixed by pull bolts, which have higher strength and can ensure the safety and sealing of the device under the condition of high pressure in the column; 5), this The invented liquid is a polluted liquid conversion device, which isolates the ordinary liquid and the polluted liquid through the flexible isolation membrane of the inert material, and empties the upper part of the air through the exhaust hole, so that the polluted liquid is always isolated from the air, and the chemical composition in the polluted liquid is guaranteed to last for a long time 6), the polluted liquid of the present invention can be mixed automatically by the flow pump, and the polluted liquid of different concentrations is configured by controlling the flow rate of the flow pump, and the required polluted liquid concentration is obtained after being fully stirred by the polluted liquid mixing tank to realize the High-precision configuration and dynamic allocation of target concentration pollution liquid; 7), the pressure difference sensor of the detection system of the present invention calculates the liquid outflow by measuring the pressure difference of the outflow liquid, which is more accurate than manual reading; 8), this The side wall of the inventive soil column shower device in contact with the plastic concrete is glued with crystal glaze glue, which can not only ensure the cohesion and sealing between the column and the plastic concrete column, but also effectively prevent the polluted liquid from measuring the flow. It is also convenient to dismantle after the end of the test without damaging the sample; 9), the effluent storage chamber of the present invention is provided with a conductivity sensor, a ph sensor and a chloride ion sensor, which are transmitted to a computer through a data line, and the effluent in the effluent can be obtained. The change of conductivity, ph and chloride ion concentration is more convenient and accurate than manual operation.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is a schematic structural view of the gas-liquid conversion cylinder, the stainless steel upper cover of the gas-liquid conversion device and the stainless steel lower cover of the gas-liquid conversion device in the gas-liquid conversion device of the present invention;

Fig. 3 is a schematic structural view of the pull bolt, the fixing screw, the cylinder of the gas-liquid conversion device and the O-shaped sealing ring in the gas-liquid conversion device of the present invention;

Fig. 4 is a structural schematic diagram of the liquid-contaminated liquid conversion cylinder, the stainless steel upper cover of the liquid-contaminated liquid conversion device, the stainless steel lower cover of the liquid-contaminated liquid conversion device and the vent hole screw plug in the liquid-contaminated liquid conversion device of the present invention;

Fig. 5 is a structural schematic diagram of the flexible isolation membrane without chemical reaction with pollutants in the liquid-contaminated liquid conversion device of the present invention, the upper column of the liquid-contaminated liquid conversion device and the lower column of the liquid-contaminated liquid conversion device;

Fig. 6 is a schematic diagram of components of each device in the pollution liquid concentration adjustment device of the present invention;

Fig. 7 is a schematic diagram of the composition of each part in the soil column shower device of the present invention;

Fig. 8 is a second schematic diagram of the composition of each part in the soil column shower device of the present invention;

Fig. 9 is a schematic diagram of the composition of each part in the soil column shower device of the present invention III;

Fig. 10 is a schematic diagram of the composition of each part in the soil column shower device of the present invention (4);

10 is a schematic diagram of the components of the effluent storage and monitoring device of the present invention;

Fig. 11 is a schematic diagram of the flow rate setting scheme of three flow pumps in the pollution liquid concentration adjustment device in the embodiment of the present invention;

In the figure, 1 is an air compressor; 2 is a variable diameter adapter; 3 is an air storage tank; 4 is a pressure reducing valve; 5 is an air filter; 6 is an oil filling tank; 7 is an oil filling tank support frame; Potentiometer; 9 is a single-pole double-throw switch; 10 is an electric proportional valve; 11 is a three-way joint one; 11-2 is a three-way joint two; 12 is a valve one; 12-2 is a valve two; 12-3 is a valve three ; 13 is a gas-liquid conversion cylinder; 14 is an instrument box; 15 is a four-way joint; 16 is a liquid-polluted liquid conversion cylinder; 17 is a soil column shower device; 18 is an effluent storage room; 19 is a slender glass tube; 20 is a differential pressure sensor; 21 is a plastic concrete soil sample; 22 is a computer for controlling and collecting and displaying data; 23 is a test platform; 24 is a high-concentration pollution liquid injection tank; Gas-liquid conversion device stainless steel upper cover; 28 is the stainless steel lower cover of the gas-liquid conversion device; 29-1 is the first pull bolt; 29-2 is the second pull bolt; 29-3 is the third pull bolt; 30-1 is fixed Screw one; 30-2 is the second fixing screw; 30-3 is the third fixing screw; 30-4 is the fourth fixing screw; 31 is the cylinder of the gas-liquid conversion device; 32-1 is the o-shaped sealing ring one; 32-2 32-3 is the third o-shaped seal ring; 33 is the stainless steel upper cover of the liquid-polluted liquid conversion device; 34 is the stainless steel lower cover of the liquid-polluted liquid conversion device; 35 is the vent hole screw plug; 36 It is a flexible isolation membrane that has no chemical reaction with pollutants; 37 is the upper column of the liquid-polluted liquid conversion device; 38 is the lower column of the liquid-polluted liquid conversion device; 39 is the stainless steel upper cover of the soil column shower device; 40 is the soil column The stainless steel base of the shower device; 41 is the support column; 42 is the permeable stone; 43 is the fixed connection bolt between the column and the base; 44 is the bottom drainage belt; 45 is the water outlet; 46 is the pressure gauge; ; 48 is a conductivity sensor; 49 is a pH sensor; 50 is a chloride ion concentration measurement sensor; 51 is a water stop clamp; 52 is a low-concentration pollution liquid injection tank; 53 is a solvent injection tank; 54 is a flow pump; 55 is a solution stirring Device; 56 is a two-way valve for solution; 57 is a mixing box for polluted liquid; 58 is a crystal glaze glue; 59 is a water stop clip two;

Detailed ways

In order to illustrate the technical solution of the present invention more clearly, the technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings:

A pollutant migration soil column device for plastic concrete according to the present invention includes an air supply device, an air pressure control device, a gas-liquid conversion device, a liquid-pollution liquid conversion device, a pollution liquid concentration adjustment device, and a soil column shower device and effluent storage monitoring device;

The air supply device is fixedly installed on the flat ground, the air enters the air compressor 1 through the air inlet, and the high-pressure gas obtained through its compression enters the air storage tank 3 through the high-pressure air pipe, and the high-pressure gas in the air storage tank 3 passes through the air outlet, Enter the air filter to filter 5, and then pass through the pressure reducing valve 4 to initially adjust its pressure;

Described air pressure control device comprises electric proportional valve 10, SPDT switch 9, potentiometer 8 and the computer 22 of control and acquisition display data, switch is connected computer 22, adopts computer 22 to set the pressure target value of electric proportional valve 10, Or switch on the potentiometer 8, and use the potentiometer 8 to manually adjust the target value (alternative control scheme);

The gas-liquid conversion device has a control valve on the upper and lower parts, the upper valve controls the connection of the upper part to the atmosphere or the adjusted air pressure, and the lower valve controls the connection of the hydraulic oil storage chamber or the liquid-contaminated liquid conversion device;

The liquid-contaminated liquid conversion device has a valve on the upper part, which is used to control the connection between the contaminated liquid mixing tank 57 and the shower equipment, and a valve on the lower part, which is connected to the liquid in the gas-liquid conversion device. The inert flexible isolation membrane 36 realizes the transmission of hydraulic pressure from the lower part to the upper part of the contaminated liquid;

The pollution liquid concentration adjustment device includes a pollutant-free solvent, a low-concentration solution pollution liquid, and a high-concentration solution pollution liquid storage tank, through the control of the flow pump 54, the pollutant allocation to the target concentration is realized;

There is a valve on the soil column shower device, the upper valve is connected to the polluted liquid, the lower part is connected to the differential pressure sensor 20 and the outflow liquid storage chamber 18, and is connected to the liquid-contaminated liquid conversion device through a connecting pipe, and the test tube port at the bottom of the shower device is connected to the drain pipe , the drain pipe is provided with a differential pressure sensor 20 to measure the volume of the connected liquid, open the water stop clamp 51, and the effluent enters the effluent storage chamber 18, and each effluent storage chamber 18 is provided with a conductivity sensor 48 and a pH sensor 49 And the chloride ion concentration measuring sensor 50.

Further, the compressor in the air supply device is placed on a flat ground with a large open space to meet its heat dissipation and air intake conditions.

Further, the high-pressure air outlet of the air compressor 1 in the air supply device connects the high-pressure pipe of the air compressor 1 and the intake pipe of the air storage tank 3 through the variable diameter adapter 2 to ensure good airtightness sex.

Further, the gas storage tank 3 in the gas supply device is equipped with a pressure gauge and a safety valve. The pressure gauge is used to measure the air pressure in the pipe in real time, and the safety valve is used for rapid pressure relief in an emergency. The capacity of the gas storage tank 3 It must be above 30L to ensure the stability of the air supply pressure.

Further, the air filter 5 in the air supply device has a filtration precision of 5 μm, and the number should be two or more, so as to ensure the filtration of the gas.

Further, the air pressure control device includes an electric proportional valve 10, a single pole double throw switch 9, a potentiometer 8 and a computer (computer 22 for controlling and collecting display data) for inputting control signals; the pressure setting range of the electric proportional valve 10 is between 0.005-1MPa, the adjustment accuracy is 0.1kpa, which can meet the high-precision adjustment of different water heads (high, medium and low water heads), and the error head is within 1cm.

Further, the switch of the air pressure control device is connected to the computer (computer 22 for controlling and collecting display data), and the electric proportional valve 10 is controlled by the computer; when the computer breaks down, the switch can be connected to the potentiometer 8, and the rotary potentiometer is turned on. 8. Adjust and set the target pressure value of the electric proportional valve 10.

Further, the upper and lower parts of the gas-liquid conversion device each have a valve; the upper valve controls the upper part of the gas-liquid conversion device to connect to the air pressure adjusted by the electric proportional valve 10 or connects to the atmosphere, and the lower valve controls the lower part of the gas-liquid conversion device to connect to the hydraulic oil. storage chamber or fluid-to-contaminated fluid switching device.

Further, the hydraulic oil in the gas-liquid conversion device adopts high-quality anti-wear hydraulic oil.

Further, the upper and lower parts of the liquid-contaminated liquid conversion device are composed of an inert (non-reactive with polluted liquid) flexible isolation membrane (a flexible isolation membrane 36 that has no chemical reaction with pollutants); the lower area is connected to the hydraulic oil , the upper area is pre-loaded with the prepared pollution liquid; the lower part of the device is equipped with a valve to control the input of upstream hydraulic oil;

Further, the upper cover of the liquid-contaminated liquid conversion device is provided with a vent hole with a diameter of 2mm and a sealing screw plug, which is used to discharge all the air in the upper part of the polluted liquid area to prevent the components in the air from mixing with the contaminated liquid. Contaminant reaction in contaminated fluid.

Further, the non-pollutant solvent in the pollution liquid concentration adjustment device, if the pollutant is inorganic, the solvent is deionized water; if the pollutant is inorganic, the solvent is an organic solvent.

Further, the flow rate setting scheme of the three flow pumps in the pollution liquid concentration adjustment device is as shown in Figure 12;

If c<c ₂ , then q ₁ =0, q ₂ =1, q ₃ =c/c ₂ -c; if c ₂ <c<c ₁ , then q ₁ =(cc ₂ )/(c ₁ -c ), q ₂ =1, q ₃ =0, where c ₁ is the concentration of high-concentration pollutants, c ₂ is the concentration of low-concentration pollutants, q ₁ is the flow velocity of high-concentration pollutants, q ₂ is the flow velocity of low-concentration pollutants, q ₃ is the solvent flow rate.

Further, the soil column shower device 17 includes a stainless steel upper cover 39, a cylinder 47, a bottom stainless steel base 40, upper and lower connecting bolts and fixing screws; the upper cover is circular, and the upper part is provided with a pressure gauge 46, a valve and The exhaust hole is provided with three anchor bolt holes on the edge, the middle concave edge of the lower base is convex, and an annular groove is arranged on the outermost edge of the middle concave place for placing an o-shaped sealing ring.

Further, the soil column shower device column 47 of the soil column shower device 17 is a transparent acrylic material with a height of 0.5m-1.5m, an outer diameter of 12-25cm, and an inner diameter of 10-20cm; The bottom connecting band 60 is connected with the column body 47 of the soil column shower device, and is provided with six screw holes.

Further, the side walls of the column body 47 of the soil column shower device and the plastic concrete soil sample 21 are bonded using crystal glaze glue 58 .

Further, the lower part of the base of the soil column device is provided with three acrylic support columns 41 and a water outlet 45; each support column is provided with three anchor bolts; the upper part of the base has fixing screws, which are initially connected to the bottom of the column , and fixed with screws; in the middle of the upper part of the base, there are bottom drainage belt 44 and permeable stone 42 successively from bottom to top, and an annular groove is arranged around the permeable stone 42, and an o-shaped sealing ring is set.

Further, the water outlet 45 of the soil column shower device is provided with a differential pressure sensor 20 and a slender glass tube 19 with scales; a valve is provided downstream of the differential pressure sensor 20, and the valve controls the outflow liquid to enter the outflow liquid storage chamber 18; The liquid storage chamber 18 is provided with a pH sensor 49, a conductivity sensor 48 and a chlorine ion concentration measurement sensor 50, which can measure the chemical properties of the collected liquid.

Further, the upper and lower covers of the gas-liquid replacement device and the upper and lower covers of the liquid-contaminated liquid conversion device and the upper cover base of the soil column shower device are all made of 306 stainless steel, which has the characteristics of high strength and corrosion resistance.

A test method for a pollutant migration soil column device for plastic concrete described in any one of the above; including the following steps:

Step 1. Assemble the pollutant migration test device, connect the various pipes of the device, and check the connection of each part of the device and the airtightness of each part of the entire device;

Step 2. Disassemble the soil column shower device 17, wash it in clean water and dry it;

Step 3, close the water-stop clamp 2 59 under the base 40 of the soil column shower device, place a permeable stone 42 and a filter paper on the base 40 of the soil column shower device, and place the O-shaped sealing ring around the permeable stone;

Step 4. Fix the connecting part at the bottom of the column body 47 of the soil column shower device to the column body 47 of the column body shower device by bolts, fill the configured plastic concrete soil sample 21 into the column body 47 of the column body shower device, In one section, the plastic concrete soil sample 21 is evenly distributed by mixing with a tool until reaching the required height;

Step 5. Put the soil column shower device 17 into a curing room with a temperature of 20°C and a humidity of 95% for a specified period of time;

Step 6. Push out the cured plastic concrete soil sample 21 from the column body 47 of the soil column shower device, apply crystal glaze glue 58 around the column body 47 of the soil column shower device, and then push the column body 47 of the soil column shower device Put it into the original position in the soil column shower device 17, place it for three days and wait for the colloid to solidify;

Step 7, inject hydraulic oil from the bottom of the gas-liquid conversion device, and stop at 90% of the conversion device;

Step 8. Through calculation, set the flow rates of the three flow pumps 54 of the polluted liquid concentration adjustment device, and mix the polluted liquids with different concentrations in the polluted liquid mixing tank 57 to obtain the configured polluted liquid with a fixed target concentration;

Step 9. Inject the prepared contaminated liquid into the upper part of the conversion device through the upper valve of the liquid-contaminated liquid conversion device until the air in the upper part of the device is exhausted; check the connecting pipe and exhaust all the air in the connecting pipe;

Step 10, connect the water inlet of the soil column shower device 17 with the liquid-pollution liquid device, adjust the electric proportional valve 10 through the computer, set the target water head size, start the air supply device, and adjust the three soil column shower device columns 47 Inject the solution of pollutants, and close the vent hole after exhausting the air in the column through the vent hole of the stainless steel upper cover 39 of the soil column shower device;

Step 11, record the amount of water discharged from the drainage pipe through the differential pressure sensor 20, measure the chemical parameters of the liquid in the corresponding effluent storage chamber 18 through the conductivity, pH, and ion concentration measuring instrument, and complete the pollutants in the plastic concrete soil sample under different water heads. Migration test in 21; the liquid in the effluent storage chamber 18 is collected through a sealed test tube for later detection needs;

Step 12, complete the test, remove the soil column shower device 17, use the automatic hydraulic jacking device to push the plastic concrete soil sample 21 out of the column body 47 of the soil column shower device, measure the pollutant content at different depths, and take out the liquid - Put the polluted liquid in the polluted liquid conversion cylinder into the chemical collection bucket for centralized treatment.

Specifically, as shown in Figures 1 to 11, the present invention provides a pollutant migration test device suitable for plastic concrete, including an air supply device, 3 air pressure control devices, 3 gas-liquid conversion devices, 3 liquid - Pollutant conversion device, 1 pollutant concentration adjustment device, 3 soil column shower devices, 3 effluent storage monitoring devices and a computer 22 for inputting, collecting and displaying data;

The air supply device is composed of an air compressor 1, a variable diameter adapter 2, an air storage tank 3, two air filters 5 and a pressure reducing valve 4 connected to each other through an air pressure hose 25; the air pressure control device is composed of Electric proportional valve 10, single pole double throw switch 9, potentiometer 8 and computer 22 of input signal are connected and controlled by circuit, and the lower end of each control device is connected to a gas-liquid conversion cylinder 13 through valve one 12 and pneumatic hose (breather pipe 25) , the upper end of each control device is connected to the high-pressure gas in the gas storage tank 3 through a tee joint 11 and a vent pipe 25;

The gas-liquid conversion device is composed of upper and lower valves 12 and a gas-liquid conversion cylinder 13, the upper part of the gas-liquid conversion cylinder 13 is controlled and connected through the upper valve, and the gas regulated by the electric proportional valve 10 enters the upper part of the cylinder body through the upper valve 12, The liquid enters the liquid-contaminated liquid conversion device through the lower valve 12 under the action of air pressure;

The liquid-contaminated liquid conversion device is formed by connecting a liquid-contaminated liquid conversion cylinder 16, a valve one 12 and a four-way joint 15 through a hydraulic hose (liquid pipe 26), and the lower end joint and the liquid are connected by the lower end of the gas-liquid conversion device. Enter the lower part of the liquid-contaminated liquid conversion cylinder, push the flexible isolation film (the flexible isolation film 36 that has no chemical reaction with the pollutants), and the polluted liquid in the upper cylinder body enters the soil column shower device 17;

The pollution liquid concentration adjustment device is composed of a high-concentration polluted liquid injection tank 24, a low-concentration polluted liquid injection tank 52, a solvent injection tank 53, a flow pump 54, a solution agitator 55, and a polluted liquid mixing tank 57. Through calculation, set The flow rate of the flow pump 54 under different tanks, high-concentration polluting liquid, low-concentration polluting liquid and solvent flow into the polluting liquid mixing tank 57, and under the agitation of the solution agitator 55, the polluting liquid of the target concentration is obtained; The soil column shower device 17 is composed of the soil column shower device stainless steel upper cover 39, the soil column shower device column body 47 of the acrylic device, the soil column shower device stainless steel base 40, pull bolts, fixing screws and crystal glaze glue 58. The contaminated liquid passes through The upper end interface of the soil column shower device 17 enters the column body, passes through the plastic concrete sample 21, the permeable stone 42, the filter paper and the bottom drainage belt 44 in turn, enters the differential pressure sensor 20 and the slender glass pavilion 19 through the effluent interface 45, and opens the stopper. Water clip 51, the effluent enters the storage chamber 18, and each liquid storage chamber 18 is provided with a concentration measuring instrument capable of detecting the conductivity, ph and chloride ion concentration of the liquid concentration therein.

The air supply device is composed of an air compressor 1, a variable diameter adapter 2, an air storage tank 3, two air filters 5 and a pressure reducing valve 4 connected to each other through a pneumatic hose; the air passes through the compressor 1 to the air Compress and enter the air storage tank 3 through the variable diameter interface 2 and the air pressure hose; the air storage tank 3 is provided with a pressure gauge to monitor the air pressure inside the tank body in real time; the air filter 5 is installed in the air storage tank 3. At the outlet, it functions to filter the compressed gas in the tank; the pressure reducing valve 4 is installed between two air filters 5 or downstream of the two air filters 5 to realize preliminary regulation of the gas pressure ; After filtering and decompressing, the gas is divided into three ways and enters the upstream of the electric proportional valve 10 through the shunt flow of two three-way joints.

Each described air pressure control device is provided with two kinds of control methods, which are respectively common mode and standby mode; common mode: the single pole double throw switch 9 is connected to the computer (the computer 22 for controlling and collecting and displaying data), through Input the control signal to realize the precise control of the electric proportional valve 10;

Alternative method: connect the single-pole double-throw switch 9 to the potentiometer 8, change the output of the electrical signal by rotating the potentiometer 8, and realize the control of the electric proportional valve 10; in addition to the above two methods, you can set the single-chip combination button control, the control method unlimited.

Each gas-liquid conversion cylinder is composed of 1 gas-liquid conversion cylinder upper cover 27, 1 gas-liquid conversion cylinder lower cover 28, an acrylic transparent cylinder 31, 2 O-shaped sealing rings 32, and 4 pull bolts 29 and 8 screws 30 form. The two sealing rings are respectively placed at the contact between the upper and lower covers and the cylinder, and are fixed by four pull bolts 29 and eight screws 30 to form a sealed space.

The gas-liquid conversion device is composed of upper and lower valves and a gas-liquid conversion cylinder 13; the upper valve is rotated to the right, and the upper part of the gas-liquid conversion cylinder is connected to the air pressure adjusted by the electric proportional valve 10, and rotated to the left side of the gas-liquid conversion cylinder Connect to the atmosphere; the lower valve is rotated to the right, the lower part of the gas-liquid conversion cylinder is connected to the lower part of the liquid-contaminated liquid conversion cylinder, rotated to the left, and connected to the tap water injection tank 6 for adding water.

Each of the liquid-contamination liquid conversion cylinders is composed of a liquid-contamination liquid conversion cylinder stainless steel upper cover 33, a liquid-contamination liquid conversion cylinder stainless steel lower cover 34, a flexible isolation membrane 36 that has no chemical reaction with pollutants, a liquid - Consisting of the upper cylinder 37 of the contaminated liquid conversion device, the lower cylinder 38 of the liquid-contaminated liquid conversion device, an upper vent hole screw plug 35, 2 O-rings, 4 pull bolts and 8 screws; the liquid- The joints of the upper cylinder 37 of the polluted liquid conversion device and the lower cylinder 38 of the liquid-polluted liquid conversion device are designed in special shapes, and the edge of the flexible isolation membrane 36 that has no chemical reaction with pollutants is fixed at the joint of the upper and lower cylinders. By setting O-rings at the contact between the cylinder body and the upper and lower covers, and by pulling bolts and screws, all components are fixed together to form two isolated airtight chambers.

The upper valve of each liquid-contaminated liquid conversion cylinder controls the outflow direction of the polluted liquid. Rotate the valve to the left, connect the contaminated liquid mixing tank 57 through the four-way joint 15 and the infusion hose 26, and the contaminated liquid mixing tank 57 is connected to the high-concentration polluted liquid injection tank 24, the low-concentration polluted liquid injection tank 52, and the solvent injection tank 57. Tank 53, flow pumps 54 are respectively connected below the three injection tanks, the flow rates of different solutions are controlled by flow pumps 54, and the required concentration of contaminated liquid can be automatically prepared after the contaminated liquid mixing tank 57 is fully stirred by the solution agitator 55; Open the exhaust hole, when the upper cavity is completely filled with polluted liquid, tighten the vent hole screw plug 35; the adjusted air pressure pushes the liquid in the air pressure conversion cylinder to enter the lower part of the liquid-contaminated liquid conversion cylinder 16, and the liquid in the lower part of the cylinder passes through The flexible isolation membrane pushes the upper polluted liquid into the soil column shower device with a fixed head pressure.

The soil column shower device 17 is composed of a soil column shower device stainless steel upper cover 39, an acrylic soil column shower device column body 47, and an soil column shower device stainless steel base 40; the soil column shower device stainless steel upper cover 39 includes an upper Cover main body, valve, pressure gauge 46, vent hole screw plug 33 and O-ring;

The bottom of the column body 47 of the acrylic soil column shower device is provided with a protruding connection belt on the outer ring, and each connection belt is provided with six screw holes, three of which are holes for the pull bolts, and three are the connection between the column body and the base. 43 holes for bolts; the stainless steel base 40 of the soil column shower device includes a stainless steel base body, three support columns 41, permeable stones 42, 3 connecting bolts, drainage belt 44, outflow port 45, pull bolts and fixing screws; pollution The liquid enters the soil column shower device 17 with a fixed water head pressure, and closes the vent hole after filling to ensure that the pollutants in the polluted liquid have no chemical reaction, and enters the plastic concrete sample 21 with a constant water head; in order to ensure the integrity of the sample , place a piece of filter paper and a permeable stone 42 at the bottom of the sample, and set a bottom drainage belt 44 so that the effluent can flow out.

The effluent storage monitoring device includes a differential pressure sensor 20, an elongated glass tube 19, a tee joint, a liquid storage chamber 18, a conductivity sensor 48, a pH sensor 49, a chloride ion concentration measurement sensor 50 and a water stop clip 51; Through the pressure difference sensor 20 and the slender glass tube 19, the pressure difference is obtained to calculate the outflow volume; the water stop clamp 51 is opened, and the outflow liquid enters the liquid storage chamber 18, and passes through the conductivity sensor 48, the pH sensor 49, and the chloride ion concentration measurement sensor 50 and calculation 2 to monitor the change of the chemical properties of the effluent in real time.

Embodiment 1, a method for the pollutant migration soil column device for plastic concrete is as follows:

1) After assembling and connecting all parts of the test device, connect the upper and lower valves of the gas-liquid conversion cylinder to the electrical proportional valve 9 and the liquid-contaminated liquid conversion cylinder 16 respectively, and connect the upper valve of the liquid-contaminated liquid conversion cylinder 16 to Soil column shower device 17, close the water stop clip 51 at the bottom of soil column shower device 17; set pressure 20kPa pressure to three electric proportional valves, start air compressor 1, observe air storage tank 2 and soil column shower device 17 Pressure gauge 46 is used to judge the internal sealing of the whole device;

2), split the soil column shower device 17 into soil column shower device stainless steel upper cover 39, acrylic soil column shower device column body 47, soil column shower device stainless steel base 40, clean and wipe the above three parts Dry.

3), close the water-stop clamp 51 under the base of the soil column shower device, place a permeable stone 42 and a filter paper on the base, and place the O-ring around the permeable stone 42;

4) Fix the shower device column 47 on the base 40 through the bottom connection part and the fixing bolt 43, fill the configured plastic concrete 21 into the soil column shower device column 47, and stir with a glass rod for each section filled Distribute the plastic concrete evenly until the desired height is achieved.

5) Fix the stainless steel upper cover 39 of the soil column shower device on the upper part of the acrylic soil column shower device column 47 by pulling bolts and screws, and put the soil column shower device 17 into a standard curing room with a temperature of 20°C and a humidity of 95%. 28 days after curing until the specified time;

6), push out the plastic concrete soil sample 21 that has been cured from the column body 47 of the soil column shower device, and apply crystal glaze glue 58 around the sample, and then push the column body 47 of the soil column shower device into the soil column shower The original position in the device 17 is placed for three days and waits for the crystal glaze glue 58 to solidify;

7), set the flow rate of the flow pump 54 of high-concentration polluting liquid 10000mg/L and low-concentration polluting liquid 5000mg/L to 1mL/s and 1mL/s respectively, and mix the polluting liquids of two concentrations in the polluting liquid mixing tank 57 , to obtain the target concentration of 7500mg/L contaminated liquid;

8), open the upper and lower valves of the gas-liquid conversion cylinder 13, the upper valve is connected to the atmosphere, and the lower valve is connected to the water injection tank 6, and the gas-liquid conversion cylinder 13 is injected with hydraulic oil under the action of its own weight, and the injection stops at 90% of the conversion device; Add the Ba2 ⁺ polluting solution with a concentration of 5000 mg/L into the pollutants and inject the high-concentration polluted solution into the injection tank 24, open the upper valve of the liquid-contaminated solution conversion cylinder 16, remove the vent hole screw plug 35, and inject the polluted solution. Until the air on the upper part of the device is exhausted and the upper cavity is filled, tighten the vent hole screw plug 35 to close the vent hole; check the connecting hose (fluid pipe 26), and exhaust all the air in the connecting pipe;

9), open the valve of the stainless steel upper cover 39 of the soil column shower device, connect with the liquid-pollution liquid conversion cylinder 16 through a pipeline, and open the vent hole of the stainless steel upper cover 39 of the soil column shower device; according to the test plan, determine three objectives The water heads are 5m, 10m and 15m respectively, and the corresponding target pressures are 50kPa, 100kPa and 150kPa respectively. Connect the SPDT switch 9 to the computer 22 for controlling and collecting and displaying data, and set the target pressure values for the three electric proportional valves 9 as 50kPa, 100kPa and 150kPa respectively. Start the air compressor 1, inject the solution of pollutants into the three soil columns, exhaust the air in the columns through the exhaust holes of the upper cover, and then tighten the exhaust hole screw plug 35, and observe the stainless steel upper cover 39 of the soil column shower device. Pressure gauge 46, compares whether the internal pressure of the soil column is the same as the set pressure;

10), through the pressure difference sensor 20 to measure the amount of water flowing out and discharged, every 1h, open the water stop clamp 51, the effluent enters the effluent storage chamber 18 from the elongated glass tube 19, and passes through the conductivity sensor 48, pH sensor 49 and The chloride ion concentration measuring instrument 50 measures the chemical parameter changes of the effluent in the storage chamber, and completes the migration test of pollutants in plastic concrete under different water heads; the liquid in the liquid storage chamber 18 is collected through a sealed test tube for later use testing needs;

11), complete the test, remove the soil column shower device 17, take out the plastic concrete soil sample 21 from the column body 47 of the soil column shower device, measure the heavy metal content at its different depths, take out the polluted liquid in the liquid-contaminated liquid conversion cylinder 16 and put it into chemical collection buckets for centralized disposal.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims (9)

A pollutant migration soil column device for plastic concrete, characterized in that, Including air supply device, air pressure control device, gas-liquid conversion device, liquid-pollution liquid conversion device, pollution liquid concentration adjustment device, soil column shower device and effluent liquid storage monitoring device; The air supply device includes an air compressor (1) and an air storage tank (3), and the air compressor (1) and the air storage tank (3) are equipped with interconnected high-pressure air pipes, and the interconnected Variable-diameter adapters (2) are installed between the high-pressure gas pipes; A vent pipe (25) is installed on the output end of the gas storage tank (3); the other end of the vent pipe (25) is connected to the gas-liquid conversion device through the air pressure control device; A decompression valve (4) and an air filter (5) are also installed on the air pipe (25). A kind of pollutant migration soil column device for plastic concrete according to claim 1, characterized in that, The air pressure control device includes a potentiometer (8), a single-pole double-throw switch (9), an electric proportional valve (10), a tee joint one (11) and a valve one (12); The gas-liquid conversion device includes at least three gas-liquid conversion cylinders (13); Three described gas-liquid conversion cylinders (13) are respectively connected on the vent pipe (25) by pipelines, A valve one (12) is installed between the gas-liquid conversion cylinder (13) and the pipeline, and a tee joint one (11) is installed between the other end of the pipeline and the vent pipe (25); Electric proportional valves (10) are all installed on the three described pipelines and connected vent pipes (25), and one end of the electric proportional valves (10) is installed on the pipelines, and the electric proportional valves The other end of (10) is arranged on the described vent pipe (25), and a potentiometer (8) is installed through a single-pole double-throw switch (9) at its extended end; Three described single-pole double-throw switches (9) are summarized into a bus line and connected to one end of the computer (22) for controlling and collecting and displaying data through the wired lines installed respectively; Pipelines are installed at the other ends of the three gas-liquid conversion cylinders (13), and the other ends of the pipelines are connected to the liquid-contaminated liquid conversion device; An instrument case (14) is installed outside the air pressure control device and the gas-liquid conversion device, and an oil filling tank support frame (7) is also installed on the instrument case (14). An oil filling tank (6) is installed on the oil tank support frame (7), A water main pipe is installed at the bottom of the oil filling tank (6), and the water main pipe is respectively connected to the pipes of the gas-liquid conversion cylinder (13) after passing through the box body through three bifurcated sub-water pipes. on the way. A pollutant migration soil column device for plastic concrete according to claim 2, characterized in that, The gas-liquid conversion cylinder (13) comprises a cylinder (31) of a cylindrical gas-liquid conversion device, and the two ends of the cylinder (31) of the gas-liquid conversion device are respectively equipped with gas-liquid conversion device stainless steel Cover (27) and gas-liquid conversion device stainless steel lower cover (28), on the gas-liquid conversion device stainless steel upper cover (27) and gas-liquid conversion device stainless steel lower cover (28), there are bolt holes, in the bolt holes A pair of tension bolts (29-1) is threaded through, and the tension bolts (29-1) are installed on the stainless steel upper cover (27 ) and the stainless steel lower cover (28) of the gas-liquid conversion device; An o-shaped sealing ring-( 32-1). A pollutant migration soil column device for plastic concrete according to claim 2, characterized in that, The liquid-contaminated liquid conversion device includes a liquid-contaminated liquid conversion cylinder (16), and the liquid-contaminated liquid conversion cylinder (16) includes a liquid-contaminated liquid conversion device upper column (37) and a liquid-contaminated liquid conversion device The lower cylinder (38), on the upper cylinder (37) of the liquid-contaminated liquid conversion device and the lower cylinder (38) of the liquid-contaminated liquid conversion device, the stainless steel of the liquid-contaminated liquid conversion device is installed respectively Cover (33) and the stainless steel lower cover (34) of the liquid-polluted liquid conversion device; Bolt holes are provided on the stainless steel upper cover (33) of the liquid-contamination liquid conversion device and the stainless steel lower cover (34) of the liquid-contamination liquid conversion device, and two pull bolts (29) are pierced in the bolt holes. -2), the two pull bolts (29-2) are installed on the stainless steel upper cover (33) of the liquid-pollution liquid conversion device and the liquid-pollution liquid conversion through the set screw two (30-2). Install the stainless steel lower cover (34); A vent hole is also installed on the stainless steel upper cover (33) of the liquid-contaminated liquid conversion device, and a vent hole screw plug (35) is arranged in the vent hole; A flexible isolation membrane (36) that has no chemical reaction with pollutants is installed between the upper column (37) of the liquid-contaminated liquid conversion device and the lower column (38) of the liquid-contaminated liquid conversion device; The stainless steel upper cover (33) of the liquid-contamination liquid conversion device, the stainless steel lower cover (34) of the liquid-contamination liquid conversion device and the upper cylinder (37) of the liquid-contamination liquid conversion device and the liquid-contamination liquid conversion device The joints of the lower cylinder (38) are all sleeved with two o-shaped sealing rings (32-2). A kind of pollutant migration soil column device for plastic concrete according to claims 1 and 4, characterized in that, The polluted liquid concentration adjustment device includes a polluted liquid mixing tank (57), one end of the polluted liquid mixing tank (57) is connected with a high-concentration polluted liquid injection tank (24) through a pipeline, and the polluted liquid is mixed The other end of the box (57) is connected with a solvent injection tank (53) through a pipeline, and a low-concentration pollution liquid injection tank (52) is connected with a pipeline at the central end of the polluted liquid mixing tank (57); A flow pump (54) is installed at the connection between the pipeline and the high-concentration pollution liquid injection tank (24), the solvent injection tank (53) and the low-concentration pollution liquid injection tank (52); At least two solution agitators (55) are also installed inside the polluted liquid mixing box (57); A main pipe is also installed at the bottom of the polluted liquid mixing tank (57), and the extension end of the main pipe is connected with three liquid pipes (26) through the four-way joint (15) installed. The other end of the liquid pipe (26) is connected on the described earth column shower device (17); Thin pipes are also installed on the upper end of the liquid-contaminated liquid conversion cylinder (16), and the other ends of the thin pipes are respectively installed on the three liquid pipes (26). A valve two (12-2) is installed at the joint of the liquid pipe (26) respectively; A solution two-way valve (56) is also installed on the main pipeline. A kind of pollutant migration soil column device for plastic concrete according to claim 5, characterized in that, The soil column shower device (17) comprises a soil column shower device stainless steel base (40), on which a soil column shower device cylinder (47) is installed, and on the soil column shower device column The top of the body (47) is equipped with an earth column shower device stainless steel upper cover (39); The bottom connection band (60) connected with the stainless steel base (40) of the soil column shower device is installed at the bottom of the column body (47) of the soil column shower device, and the bottom connection band (60) There are also at least three fixing bolt holes on the stainless steel base (40) of the soil column shower device; A fixed connecting bolt (43) is pierced in the fixing bolt hole, and a fixing screw (30-4) is sleeved on the fixed connecting bolt (43); A support column (41) for supporting the soil column shower device (17) is also pierced at the bottom end of the stainless steel base (40); A valve three (12-3) is also installed on the stainless steel upper cover (39) of the soil column shower device, and a pressure gauge (46) is also installed on one side of the valve three (12-3); In the central position of the stainless steel base (40) of the soil column shower device, a groove with a height of 1 cm is also installed, Install drainage strips (44) and permeable stones (42) in the interior of the groove, A connected small hole is provided at the center of the bottom drainage belt (44), the stainless steel base of the soil column shower device (40) and the groove, and a connected water outlet (45) is provided at the small hole; Also be equipped with water stop clip two (59) at described water outlet (45); An o-shaped sealing ring three (32-3) is also installed between the permeable stone (42) and the stainless steel base (40) of the earth column shower device; Fill with plastic concrete soil sample (21) inside described soil column shower device cylinder (47), also be coated with between described plastic concrete soil sample (21) and soil column shower device cylinder (47) Crystal glaze glue (58). A kind of pollutant transfer soil column device for plastic concrete according to claim 2, is characterized in that, Also be equipped with a test platform (23) at the lower end of the instrument case (14) that includes the air pressure control device and the gas-liquid conversion device, and the described liquid-polluted liquid conversion device, on the side of the test platform (23) An effluent storage monitoring device is installed on the side wall; The effluent storage monitoring device is connected to the water stop clip two (59) of the water outlet (45) of the soil column shower device (17) through a pipeline. A pollutant transfer soil column device for plastic concrete according to claims 6 and 7, characterized in that, The effluent storage monitoring device comprises an elongated glass tube (19) which is arranged on the test platform (23), and a tee joint two ( 11-2) A differential pressure sensor (20) is connected; The other end of the water outlet (45) is connected to the tee joint two (11-2) of the elongated glass tube (19); The lower end of the elongated glass tube (19) is also connected to an outflow liquid storage chamber (18) through a liquid flow pipe, and a water stop clamp (51) is also clamped on the liquid flow pipe; One end of the effluent storage chamber (18) is respectively equipped with a conductivity sensor (48), a pH sensor (49) and a chloride ion concentration measurement sensor (50); The conductivity sensor (48), pH sensor (49) and chloride ion concentration measurement sensor (50) are respectively connected to the other end of the computer (22) for controlling and collecting and displaying data through connected wired lines. A kind of test method for the pollutant migration soil column device of plastic concrete as described in claim 1-8, it is characterized in that, its specific operation steps are as follows: (1) Assemble the pollutant migration test device, connect the various pipes of the device, and check the connection of each part of the device and the airtightness of each part of the entire device; (2), the soil column shower device (17) is disassembled, put into clean water and wipe dry after cleaning; (3), close the water stop clip two (59) under the stainless steel base (40) of the soil column shower device (17), place a permeable stone (42) and a filter paper on the base, and place the o-shaped Sealing ring three (32-3) is placed around the permeable stone (42); (4), fix the bottom connecting band (60) of the column body (47) of the soil column shower device to the stainless steel base (40) of the soil column shower device through the fixed connection bolt (43) and the set screw (30-4) Above, fix the column body (47) of the soil column shower device on the stainless steel base (40), fill the configured plastic concrete soil sample (21) into the column body (47) of the soil column shower device, and fill each section, Using tools to mix the plastic concrete soil sample (21) evenly distributed until reaching the desired height; (5), pass the upper cover (39) of the soil column shower device, the column body (47) of the soil column shower device and the stainless steel base (40) of the soil column shower device through the pull bolt (29-3) and the pull screw (30 -3) Connect and fix as a whole, put the soil column shower device (17) into a curing room with a temperature of 20° C. and a humidity of 95% for a specified time; (6), the solid plastic concrete soil sample (21) that curing finishes is pushed out from the column body (47) of the soil column shower device, and smears crystal glaze glue (58) around the plastic concrete soil sample (21), and then Push the plastic concrete soil sample (21) into the original position in the soil column shower device (17), and place it for three days to wait for the colloid to solidify; (7), inject hydraulic oil from the bottom of the gas-liquid conversion device, and stop at 90% of the conversion device; (8), by calculation, the flow velocity of three flow pumps (54) of the pollution liquid concentration adjustment device is set, and the pollution liquids of different concentrations are mixed in the pollution liquid mixing tank (57), and the fixed target concentration obtained is configured. contaminated liquid; (9) Inject the prepared contaminated liquid into the upper part of the conversion device through the upper valve of the liquid-contaminated liquid conversion device until the air in the upper part of the device is exhausted; Check the connecting pipe and exhaust all the air in the connecting pipe; (10), connect the water inlet of the soil column shower device (17) with the liquid-contaminated liquid device, adjust the electric proportional valve through the computer (22) for controlling and collecting and displaying data, set the target water head size, and start the air supply device , three soil column shower devices (17) are injected with the solution of pollutants, and the air in the column is exhausted through the exhaust holes of the loam cake to close the exhaust holes; (11), record the amount of water discharged from the drainpipe by the differential pressure sensor (20), measure the chemical parameters of the liquid in the corresponding liquid storage chamber by the conductivity, pH, and ion concentration measuring instrument, and complete the pollutants in the plastic concrete soil under different water heads Migration test in the sample (21); the liquid in the contaminated liquid mixing box (57) is collected by a sealed test tube for later detection needs; (12), complete the test, remove the soil column shower device (17), use the automatic hydraulic jacking device to push out the plastic concrete soil sample (21) from the column body (47) of the soil column shower device, and measure its different depths Take out the contaminated liquid in the liquid-contaminated liquid conversion tank and put it into the chemical collection bucket for centralized treatment.

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