CN105466815A - Underground water contaminant movement simulation device on transfluence condition and using method - Google Patents

Underground water contaminant movement simulation device on transfluence condition and using method Download PDF

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Publication number
CN105466815A
CN105466815A CN201610020021.9A CN201610020021A CN105466815A CN 105466815 A CN105466815 A CN 105466815A CN 201610020021 A CN201610020021 A CN 201610020021A CN 105466815 A CN105466815 A CN 105466815A
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organic glass
water
glass post
pressure
cylinder
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CN201610020021.9A
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Chinese (zh)
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CN105466815B (en
Inventor
王妍妍
闫雅妮
郑倩琳
刘路
马腾
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中国地质大学(武汉)
中国地质科学院水文地质环境地质研究所
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N13/00Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
    • G01N13/04Investigating osmotic effects

Abstract

The invention discloses an underground water contaminant movement simulation device on the transfluence condition and a using method, and belongs to the technical field of underground water contamination simulation instrument equipment. The underground water contaminant movement simulation device comprises a pressure supply unit, a water supply unit, an earth pillar unit and a sample receiving unit. The pressure supply unit comprises a pressure air cylinder, and a pressure reducing valve is arranged at an outlet of the pressure air cylinder. The water supply unit comprises a closed organic glass pillar I capable of bearing pressure. The earth pillar unit comprises an organic glass pillar II capable of bearing pressure. A simulated earth pillar is arranged inside the organic glass pillar II. The top and the bottom of the simulated earth pillar are water-bearing layer settlings, and the middle of the simulated earth pillar is weak water permeable layer settling media. The sample receiving unit comprises a water stabilizing tank and a sampler with scale marks. The pressure reducing valve, the organic glass pillar I and the organic glass pillar II are sequentially connected through guiding pipes. The organic glass pillar II, the water stabilizing tank and the sampler are sequentially communicated through guiding pipes. The high water head difference supplied by underground water transfluence and the reducing environment of the weak water permeable layer are provided, the transfluence water head difference is 0-15 cm, operation is easy, adjustment is convenient, and test data is more accurate and reliable.

Description

The analogue means that more under stream condition, groundwater pollutant moves and using method

Technical field

The present invention relates to groundwater pollution simulation instrument and equipment technical field.

Background technology

Along with the acceleration of industrialization and Development of China's Urbanization, surface water and groundwater pollution tendencies constantly increases the weight of.Because of water quality deterioration, mining rate reduces shallow ground water, and because water quality is better, mining rate constantly increases deep phreatic water; Shallow-layer and deep phreatic water head continue to increase, and then make the shallow ground water leakage-releasing water deep water that polluted, cause deep phreatic water water quality deterioration.

Aquitard is the tie that shallow-layer is connected with deep layer water-bearing zone, plays conducting water pressure and transmission solute component function.Aquitard media particle is little, microporosity is many, and underground water mainly exists with the form of Bound moisture, is often in weak reducing environment.Therefore, in aquitard there is significant difference with water-bearing zone in the transport kinetics rule of Water Transport feature and pollutant.Earth pillar model, as the important research method of contaminant transportation dynamics problem, has obtained common concern and widespread use, and has emerged in large numbers large quantities of soil column leaching device.Such as, " a kind of device analyzed pollutant and move in different medium " of the people such as Li Peijun design, can simulate after connecting geneva bottle under waiting the stablizing of head and ooze; " a kind of method and apparatus studying pollutant migration and conversion in soil " of the design such as Wang Minjian can study the volatilization of pollutant in soil, diafiltration and degraded, is unsaturated soil column experiments; " temperature control-pressure control underground water transfluent pollution simulation system " of the people such as Ma Chuanming design can be used for steady temperature and pressure, and wherein pressure controls by supercharge pump thus realize physical simulation to get over streaming system.

Reflect in research in the past that current earth pillar model exists following several defect: one, the earth pillar device that present stage uses is designed to the hydraulics of unsaturation or low pressure-bearing mostly, simulated groundwater cannot get over the transport kinetics rule of pollutant under stream condition; Its two, only several high pressure earth pillar does not but consider chemical environment, if underground water many places in aquitard are in reducing environment, if with supercharge pump supercharging, can produce well-oxygenated environment, and causes the pollutant of isotope of redox-sensitive (as NH 4 +, SO 4 2-deng) Transport And Transformation in aquitard and underground actual conditions run counter to.Current device all cannot realize the test simulation of chemical fields-physic field coupling, and can only carry out test simulation for single game (only considering pressure, water chemistry).

Therefore, how to research and develop a kind of more close to actual conditions during leakage-releasing water, the reducing environment providing the high water head of leakage-releasing water difference and aquitard the contaminant transportation analogue means of pressure head can be regulated accurately and easily, and avoid the pollutant of isotope of redox-sensitive that the Forms Transformation of runing counter to actual conditions occurs when experimental simulation, be the technical matters that those skilled in the art need solution badly.

Summary of the invention

The technical problem to be solved in the present invention, be to provide analogue means and the using method thereof of groundwater pollutant migration under a kind of more stream condition, its experimental enviroment is closer to actual conditions, provide the high water head difference of leakage-releasing water and the reducing environment of aquitard, pressure head can be regulated accurately and easily, and avoid the pollutant of isotope of redox-sensitive that the Forms Transformation of runing counter to actual conditions occurs when experimental simulation, make test figure more accurately, reliably.

For solving the problems of the technologies described above, the technical solution used in the present invention is:

The more analogue means of groundwater pollutant migration under stream condition, comprises the voltage supply unit, water supplying unit, the earth pillar unit that are linked in sequence successively and connects sample unit;

Described voltage supply unit comprises the pressure cylinder that outlet is provided with reduction valve, what described water supplying unit comprised that an inside is equipped with simulating pollution underground water can the airtight organic glass post I of pressure-bearing, described organic glass post I upper end is connected with reduction valve by conduit, described earth pillar unit comprises one can the airtight organic glass post II of pressure-bearing, be provided with Simulated soil columns in organic glass post II and namely simulate deposition medium (comprising upper and lower water-bearing zone and middle part aquitard), the bottom of described organic glass post I is communicated with by the top of conduit with organic glass post II, the described sample unit that connects comprises steady water tank and the graduated sampler of mark, the bottom of described organic glass post II is communicated with steady water tank bottom by conduit, described steady water tank is communicated with sampler by conduit.

As preferably, described pressure cylinder is high-purity argon gas cylinder, purity of argon >=99.999%.

As preferably, described Simulated soil columns is followed successively by quartz sand layer I, viscous soil horizon and quartz sand layer II from top to bottom, be provided with nylon gauze between every two media in earth pillar, bottom described quartz sand layer II and be also provided with nylon gauze between water delivering orifice, nylon gauze aperture density is 50 to 500 orders.

As preferably, the securing member II that described organic glass post I and organic glass post II include cylinder, are positioned at the securing member I at cylinder top, screen cloth filter membrane frid and are positioned at bottom cylinder, screen cloth filter membrane frid is positioned at the earth pillar top of cylinder, and securing member I and securing member II are fixed by packing ring and nut with cylinder respectively.

As preferably, described cylinder height 100cm, internal diameter 10cm, cylinder all indicates scale from bottom to top, and precision is 1mm, and screen cloth filter membrane frid aperture is 500 orders.

As preferably, described conduit is polyfluortetraethylene pipe.

As preferably, be provided with stainless steel inner lining tube in the conduit between described reduction valve and organic glass post I, be provided with draw-in groove in the joint of reduction valve, endoporus 3mm, is threaded, and conduit and organic glass post I junction are sealed by taper plug plug.

As preferably, bottom described organic glass post I and organic glass post II, be equipped with A-frame.

As preferably, described steady water tank is made up of polypropylene centrifuge tube, and volume is 10ml, and internal diameter is 10mm, and steady water tank water inlet is in bottom, and outlet is positioned at steady water tank sidepiece 1/2nd place.

The more using method of the analogue means of groundwater pollutant migration under stream condition, concrete steps are as follows:

The first step, cohesive soil is too much hole sizer after air-dry grinding, and load in organic glass column II by the unit weight of undisturbed soil, at top layer and the bottom laying silica sand of cohesive soil, layering during filling, is adopted to load method, every 1cm one deck, every layer completes and uses compactor compacting, soil layer surface ball woll, then fill out lower one deck, not plan a successor phenomenon to avoid Simulated soil columns in experimentation;

Second step, injects deionized water from organic glass post II lower end, and to drive away bubble in Simulated soil columns, ensure that in experimentation, Simulated soil columns is in water-saturated state, when water layer appears in Simulated soil columns top by the time, namely Simulated soil columns reaches water-saturated state;

3rd step, after full water, organic glass post II and organic glass post I, pressure cylinder are linked in sequence, regulate the top hole pressure of reduction valve to the numerical value of test setting, permeate on top with simulating pollution underground water, every 2h gets a sample, can be used for follow-up hydrochemical analyse, records out the flow of flow liquid, volume simultaneously.

The beneficial effect adopting technique scheme to produce is: the present invention one utilizes pressure cylinder to pressurize, the pressure head needed for test is regulated by reduction valve gauge tap, both the limitation that the head difference scope simulated by geneva bottle is less had been avoided, turn avoid the disturbance of supercharge pump pressurization to chemical environment, its experimental enviroment is closer to actual conditions, provide the high water head difference of leakage-releasing water and the reducing environment of aquitard, can be accurate, regulate pressure head easily, make test figure more accurate, reliably, and avoid the pollutant of isotope of redox-sensitive that the Forms Transformation of runing counter to actual conditions occurs when experimental simulation, two is that in system provided by the invention, unit is the entirety mutually organically combined, and can dismantle flexibly again between each unit, easy to assembly, unit is simple and easy to get, is laboratory common materials simultaneously.

Accompanying drawing explanation

Fig. 1 is the structural representation of one embodiment of the invention;

Fig. 2 is the joint design schematic diagram of reduction valve and conduit connection;

Fig. 3 is principle of work block diagram of the present invention;

Each figure number name is called: 1-pressure cylinder, 2-reduction valve, 3-joint, 4-conduit, 5-securing member I, 6-screen cloth filter membrane frid, 7-cylinder, 8-securing member II, 9-nylon gauze, 10-A-frame, 11-steady water tank, 12-sampler, 13-organic glass post I, 14-organic glass post II, 15-internal lining pipe, 16-taper plug plug, 17-nut.

Embodiment

Below in conjunction with drawings and Examples, the present invention is further detailed explanation.

As shown in Figure 1, the present invention includes voltage supply unit, water supplying unit, the earth pillar unit be linked in sequence successively and connect sample unit, described voltage supply unit comprises the pressure cylinder 1 providing pressure and reducing environment that outlet is provided with reduction valve 2, intake pressure is reduced to the top hole pressure of setting and keeps stable by described reduction valve 2, described pressure cylinder 1 is preferably high-purity argon gas cylinder, purity of argon >=99.999%, described water supplying unit comprise an inside be equipped with groundwater pollution simulation liquid, can pressure-bearing, airtight organic glass post I 13, described organic glass post I 13 upper end is connected with reduction valve 2 by conduit, described earth pillar unit comprises one can the airtight organic glass post II 14 of pressure-bearing, the top of organic glass post II 14 and filling water-bearing zone, bottom sediment, aquitard deposition medium (namely simulating deposition medium) is loaded at middle part, described Simulated soil columns is followed successively by quartz sand layer I (simulation water-bearing zone sediment) from top to bottom, viscous soil horizon (simulation aquitard sediment) and quartz sand layer II (simulation water-bearing zone sediment), nylon gauze 9 is provided with between every two media in earth pillar, top quartz sand layer I seepage is avoided to enter the viscous soil horizon at middle part, prevent the soil in viscous soil horizon to be scattering in the quartz sand layer II of bottom simultaneously, bottom described quartz sand layer II and be also provided with nylon gauze between water delivering orifice, the nylon gauze 9 of the bottom filters water outlet, avoid taking particle out of Simulated soil columns, described nylon gauze aperture density is 50 to 500 orders (selecting suitable order number according to the size of media particle size), the bottom of described organic glass post I 13 is communicated with the top of organic glass post II 14 by conduit 4, described organic glass post I 13 and described organic glass post II 14 all indicate scale from bottom to top, precision is 1mm, the described sample unit that connects comprises steady water tank 11 and the graduated sampler 12 of mark, preferably, described steady water tank 11 is made up of polypropylene centrifuge tube, volume is 10ml, internal diameter is 10mm, steady water tank 11 water inlet is in bottom, outlet is positioned at steady water tank 11 sidepiece 1/2nd place, can prevent air from entering in the hole of the medium in Simulated soil columns, avoid the migration pathway of blocking underground water, the bottom of described organic glass post II 14 is communicated with steady water tank 11 bottom by conduit 4, described steady water tank 11 is communicated with sampler 12 by conduit 4, described sampler 12 preferably adopts graduated cylinder, graduated cylinder is glass material, accurately can read the volume of efflux, above-mentioned conduit 4 all adopts polyfluortetraethylene pipe.

In this experimental provision, quartz sand layer I and quartz sand layer II are highly for 50mm, particle diameter are 2 to 4mm, for simulating upper and lower water-bearing zone, viscous soil horizon for simulating the aquitard be between two water-bearing zones, by the seepage pressure of aquitard and weak reducing environment when high-purity argon gas cylinder carrys out simulated groundwater leakage-releasing water.Experimental temperature controls at 13 to 15 DEG C, with the actual environment close to underground water.High-purity argon gas cylinder reduction valve 2 outlet pressure is adjusted to 0.25MPa to simulate more flowing pressure (15m head difference), and the weak reducing environment of supplying subsurface water.During experiment, the NH of 90mg/L can be adopted 4cl simulates the underground water that ammonium nitrogen pollutes, wherein Cl -the transportion and transformation of conservative property ion in underground water can be indicated as tracer agent.Adopt layering to load method, every 1cm one deck when loading Simulated soil columns, every layer completes and use compactor compacting, surperficial for soil layer ball woll, then fills out lower one deck, not to plan a successor phenomenon to avoid earth pillar in experimentation.

Further, described organic glass post I 13 and organic glass post II 14 include cylinder 7, are positioned at the securing member I 5 at cylinder 7 top, screen cloth filter membrane frid 6 and the securing member II 8 that is positioned at bottom cylinder 7, cylinder 7 precision is 1mm, adopt medical grade high precision to add heavy sheet glass to make, securing member I 5 and securing member II 8 adopt high density polyoxymethylene plastic production, screen cloth filter membrane frid 6 is positioned at the aquitard Simulated soil columns top of cylinder 7, play the effect of even gas distribution and cloth liquid, securing member I 5 and securing member II 8 are fixed by packing ring and nut with cylinder 7 respectively; Further, the high 100cm of described cylinder 7, internal diameter 10cm, screen cloth filter membrane frid 6 aperture is 500 orders.

Further, A-frame 10 is equipped with bottom described organic glass post I 13 and organic glass post II 14.

Further, be provided with stainless steel inner lining tube 15 in conduit 4 between described reduction valve 2 and organic glass post I 13, be provided with draw-in groove in the joint 3 of reduction valve 2, endoporus 3mm, be threaded, conduit 4 and organic glass post I 13 junction are sealed by taper plug plug 16.

The more using method of the analogue means of groundwater pollutant migration under stream condition, concrete steps are as follows:

The first step, cohesive soil crosses 100 object porous sieves after air-dry grinding, and load in organic glass column II 14 by the unit weight of undisturbed soil, the silica sand of 5cm is respectively laid to simulate upper and lower water-bearing zone at the top layer of cohesive soil and bottom, top layer is quartz sand layer I, bottom is quartz sand layer II, quartz sand layer II bottom with 200 object nylon gauzes as loaded filter to prevent cohesive soil Particle Blocking exhalant canal, separate with 200 order nylon gauzes between every layer of medium, layering is adopted to load method when loading earth pillar, every 1cm one deck, every layer completes and uses compactor compacting, soil layer surface ball woll, fill out lower one deck again, not plan a successor phenomenon to avoid Simulated soil columns in experimentation, second step, injects deionized water from organic glass post II 14 lower end, and to drive away the bubble in Simulated soil columns, ensure that in experimentation, Simulated soil columns is in water-saturated state, when water layer appears in Simulated soil columns top by the time, namely Simulated soil columns reaches water-saturated state, 3rd step, after full water, organic glass post II 14 and organic glass post I 13, pressure cylinder 1 are linked in sequence, regulate the top hole pressure of reduction valve 2 to the numerical value of test setting, permeate on top with simulating pollution underground water, every 2h gets a sample, can be used for follow-up hydrochemical analyse, records out the flow of flow liquid, volume simultaneously.

Device provided by the invention can the Transport And Transformation effect of simulating pollution thing when underground water leakage-releasing water, experimental enviroment is closer to actual conditions, provide the high water head difference of leakage-releasing water and the reducing environment of aquitard, pressure head can be regulated accurately and easily, and avoid the pollutant of isotope of redox-sensitive that the Forms Transformation of runing counter to actual conditions occurs when experimental simulation, make test figure more accurately, reliably, it measures conveniently, error is little, and the high pressure reducing environment created is close to the true environment of underground water; The parameter such as dispersion coefficient, infiltration coefficient can be calculated by the data obtained in this device experimentation simultaneously.This device is that the pressure cylinder by connecting inert gas improves, and adopts the NH of 90mg/L 4when Cl simulates the underground water of ammonium nitrogen pollution, the present embodiment experimental result shows, and goes out NO in flow liquid 3 -, NO 2 -concentration maintains reduced levels always, that is in a reducing environment, and NH 4 +main based on suction-operated, the conversion substantially not on existing forms, and if NH in an oxidizing environment 4 +the reactions such as nitrification may be there is and generate NO 3 -, this will run counter to actual conditions, cannot reach the object that water pollutant Transport And Transformation process is descended in the reduction of laboratory experiment analogue means practically.

Although be described the preferred embodiments of the present invention by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, can also make the concrete conversion of a lot of form, these all belong within protection scope of the present invention.

Claims (10)

1. get over the analogue means of groundwater pollutant migration under stream condition, it is characterized in that: comprise the voltage supply unit, water supplying unit, the earth pillar unit that are linked in sequence successively and connect sample unit;
Described voltage supply unit comprises the pressure cylinder (1) that outlet is provided with reduction valve (2); Described water supplying unit comprise an inside be equipped with groundwater pollution simulation liquid, can pressure-bearing, airtight organic glass post I (13), described organic glass post I (13) upper end is connected with reduction valve (2) by conduit (4); Described earth pillar unit comprises the airtight organic glass post II (14) that an inside is filled with Simulated soil columns, and the bottom of described organic glass post I (13) is communicated with the top of organic glass post II (14) by conduit (4); The described sample unit that connects comprises steady water tank (11) and the graduated sampler of mark (12), the bottom of described organic glass post II (14) is communicated with steady water tank (11) bottom by conduit (4), and described steady water tank (11) is communicated with sampler (12) by conduit (4).
2. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, is characterized in that: described pressure cylinder (1) is high-purity argon gas cylinder, purity of argon >=99.999%.
3. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, it is characterized in that: described Simulated soil columns is followed successively by quartz sand layer I, viscous soil horizon and quartz sand layer II from top to bottom, nylon gauze is provided with between every two media in Simulated soil columns, bottom described quartz sand layer II and be also provided with nylon gauze between water delivering orifice, nylon gauze aperture density is 50 to 500 orders.
4. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, it is characterized in that: described organic glass post I (13) and organic glass post II (14) include cylinder (7), are positioned at the securing member I (5) at cylinder (7) top, screen cloth filter membrane frid (6) and are positioned at the securing member II (8) bottom cylinder (7), screen cloth filter membrane frid (6) is positioned at the Simulated soil columns top of cylinder (7), and securing member I (5) and securing member II (8) are fixed by packing ring and nut with cylinder (7) respectively.
5. the analogue means of groundwater pollutant migration under more stream condition according to claim 4, it is characterized in that: described cylinder (7) high 100cm, internal diameter 10cm, screen cloth filter membrane frid (6) aperture is 500 orders.
6. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, is characterized in that: described conduit (4) is polyfluortetraethylene pipe.
7. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, it is characterized in that: in the conduit (4) between described reduction valve (2) and organic glass post I (13), be provided with stainless steel inner lining tube (15), draw-in groove is provided with in the joint (3) of reduction valve (2), endoporus 3mm, be threaded, conduit and organic glass post I (13) junction are sealed by taper plug plug (16).
8. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, is characterized in that: described organic glass post I (13) and organic glass post II (14) bottom are equipped with A-frame (10).
9. the analogue means of groundwater pollutant migration under more stream condition according to claim 1, it is characterized in that: described steady water tank (11) is made up of polypropylene centrifuge tube, volume is 10ml, internal diameter is 10mm, steady water tank (11) water inlet is in bottom, and outlet is positioned at steady water tank (11) sidepiece 1/2nd place.
10. get over the using method of the analogue means of groundwater pollutant migration under stream condition, it is characterized in that:
The first step, cohesive soil is too much hole sizer after air-dry grinding, and load in organic glass column II (14) by the unit weight of undisturbed soil, at top layer and the bottom laying silica sand of cohesive soil, layering during filling, is adopted to load method, every 1cm one deck, every layer completes and uses compactor compacting, soil layer surface ball woll, then fill out lower one deck, not plan a successor phenomenon to avoid Simulated soil columns in experimentation;
Second step, injects deionized water from organic glass post II (14) lower end, and to drive away bubble in Simulated soil columns, ensure that in experimentation, Simulated soil columns is in water-saturated state, when water layer appears in Simulated soil columns top by the time, namely Simulated soil columns reaches water-saturated state;
3rd step, after full water, organic glass post II (14) and organic glass post I (13), pressure cylinder (1) are linked in sequence, regulate the top hole pressure of reduction valve (2) to the numerical value of test setting, permeate on top with simulating pollution underground water, every 2h gets a sample, records out the flow of flow liquid, volume simultaneously.
CN201610020021.9A 2016-01-13 2016-01-13 The simulator and application method that groundwater pollutant migrates under the conditions of more flowing CN105466815B (en)

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CN109187283B (en) * 2018-08-13 2020-11-13 浙江海洋大学 Device and method for determining internal moisture permeation rate of easily fluidized cargo under real ship motion

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