CN108447376A - A kind of assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become and method - Google Patents
A kind of assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become and method Download PDFInfo
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Abstract
A kind of assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become and method, including water supply installation, reactor, injection device, sampler and water-storing device, the reactor is a groove body for carrying upper cover, and space in groove body is divided into pond, simulation water-bearing layer and discharge bay by two vertical filters in groove body；The water supply installation is connected with pond is entered, the water-storing device is connected with discharge bay, the upstream in simulation intake area domain is equipped with injector well in groove body, monitoring well is provided in groove body, position corresponding with injector well is equipped with injection orifice on upper lid, position corresponding with monitoring well is equipped with thief hole, and the injection device is connect with injection orifice, and the sampler is connect with thief hole.It is the device flexible design, easy to operate, highly practical, at low cost.
Description
Technical field
The invention belongs to soil and groudwater remediation Treatment process fields, and in particular to a kind of assessment nano-particle is in underground
It migrates in environment and returns the analogue experiment installation to become and method.
Background technology
Underground water be human being's production, life one of important water source.However due to industrial and agricultural production and waste discharge etc.
Influence, China's underground water pollution problem becomes increasingly conspicuous.In January, 2016, the groundwater dynamic monthly magazine of Ministry of Water Resources's publication showed water quality
Evaluation result is totally poor, surpasses 8 one-tenth of underground water and is contaminated, and there are a degree of heavy metals and toxic organic for some areas
Object pollutes.If these polluted underground waters cannot be administered in time, the problems such as drinking water and food safety hazards will one after another and
Extremely, and to health and ecological environment great threat is caused, therefore there is an urgent need for develop suitable for effective underground water pollution control
Recovery technique.
Polluted underground water recovery technique includes showering technology (mainly Pump-and-Treat technology) and based technique for in-situ remediation
(in-situ injection, permeable reactive barrier etc.).Pump-and-Treat is handled in earth's surface after polluted underground water is extracted out/pumped out, and is reached
Recharge is carried out after mark again.Of high cost needed for the process, energy consumption is big, waste groundwater resources, unsustainable, more and more
It is abandoned by the engineers of domestic and foreign scholars and European and American developed countries on ground.Based technique for in-situ remediation can be to the pollutant in underground water
Treatment in situ is carried out, economic benefit is good, is convenient for management.Wherein in-situ injection technology is directly injected into underground water pollution region
Chemistry or biological agent, by the chemistry or biodegradation process of reinforcing Organic Chemicals In Groundwater to accelerate its removal, tool
There is higher removal efficiency and easy construction, expense be low, small to environmental perturbation of pollutant exposure is few.Nano material
Due to large specific surface area, the advantages such as surface-active is strong, rapid reaction is effective, becoming the research hotspot of groundwater remediation, such as
There are numerous research and utilization in-situ injection nano zero valence irons to repair organic pollutions underground water, the seminars such as chlorohydrocarbon to have published an article
It also indicates that, nano material such as nano magnesia and its modified material, nano aluminium oxide and its modified material can be in underground water
Heavy metal carry out highly desirable Adsorption.
However when nano material is applied to practical groundwater remediation by in-situ injection technology, the migration of nano-particle
The repairing effect of pollutant will can be had an important influence on, therefore it is urgently that migration of the nano-particle in underground reservoir and returning, which becomes,
Hot and difficult issue problem to be probed into.Carry out migration of the nano-particle in underground environment and return the research that becomes, not only nanometer material
The effect prediction that material repairs practical polluted underground water provides foundation, for probing into influence of the nano-particle to environmental and human health impacts
Also it is of great significance.
Due to the complexity and concealment of underground environment, migration of the nano-particle in underground reservoir and return become to being difficult to it is pre-
It surveys, further, since nano-particle is different from soluble chemical agent, the migration performance in underground water is to influence pollutant to repair
One of an important factor for multiple effect, therefore, it is necessary to develop a kind of easy to operate, highly practical, flexible design can simulate
Nano material migrates and returns to become and its to the simulator of polluted underground water in-situ immobilization process, pass through interior in underground environment
Simulated experiment furthers investigate in-situ injection technology under different water cut channel type and flowing water field condition, the migration distance of nano-particle
(radius of influence), injection dosage, service life and its repairing effect to pollutant, are polluted underground water based technique for in-situ remediation
Exploitation provides reliable theoretical foundation and underlying parameter, and provides parameter for the practical application of in-situ injection technology and support.
Invention content
The technical issues of solution：It is an object of the invention to the deficiencies for existing research, provide a kind of assessment nanoparticle
Son migrates in underground environment and returns the analogue experiment installation to become and method, and under the reparation impurely of in-situ injection nano material
The whole process of water is simulated.It is aqueous to simulate different types of underground saturation homogeneous by filling different types of medium
Layer, the conditions such as adjustment flowing water field, nanometer suspension is injected in underground water, then analyze nanometer by the way of injecting while stirring
The ion and target contaminant that particle generates are suitable for research nano-particle full in the distribution and conversion in different time, space
With in homogeneous aquifer migration and return, and simulation in-situ injection technology is to the repairing effect of pollutant.
Technical solution：A kind of assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become, including supplies
Water installations, reactor, injection device, sampler and water-storing device, the reactor are a groove body for carrying upper cover, groove body
It is interior that space in groove body is divided into pond, simulation water-bearing layer and discharge bay by two vertical filters；The water supply installation with
Enter pond to be connected, the water-storing device is connected with discharge bay, and the upstream in simulation intake area domain is equipped with injector well, groove body in groove body
It is inside provided with monitoring well, position corresponding with injector well is equipped with injection orifice on upper lid, and position corresponding with monitoring well is equipped with sampling
Hole, the injection device are connect with injection orifice, and the sampler is connect with thief hole.
Above-mentioned water supply installation includes that the connected liquid storage bottle of pipeline sequence, flowmeter and peristaltic pump a, water supply installation pass through pipe again
Road is connected with pond is entered, and the pipeline is equipped with sampling valve a.
Above-mentioned water-storing device includes water level regulation slot and waste collection bottle, and discharge bay is connected by pipeline and water level regulation slot
It connects, pipeline is equipped with valve and sampling valve b, and water level regulation slot is equipped with the water outlet for fixing water level.
Above-mentioned injector well and monitoring well are the stainless steel screen casing with bar shaped screen slot, and screen slot is less than filled media grain size, sieve
Thickness of pipe wall 0.8mm, injector well internal diameter are 1.5cm, and monitoring well internal diameter is 1cm；Injector well and monitoring well pass through waterproof silicone seal
Glue bonds in shaft bottom and groove body bottom vertically.
Above-mentioned filter is made of poly (methyl methacrylate) plate frame and stainless steel cloth, and stainless steel cloth passes through waterproof silicone sealant
Be bonded and fixed on poly (methyl methacrylate) plate frame, it is described enter the position that has a common boundary respectively with simulation water-bearing layer of pond and discharge bay be equipped with
Groove, poly (methyl methacrylate) plate frame insert in groove；Enter the cobblestone for filling that grain size is 1.5~4cm in pond and discharge bay.
Above-mentioned upper cover is the poly (methyl methacrylate) plate of thickness 5mm, and which is provided with injection orifice that aperture is 4.8mm and aperture is 1mm's
The position of thief hole, injection orifice and thief hole and quantity are corresponding with injector well and monitoring well respectively；Injection orifice connection injection dress
It postpones for injecting nano-particle, sampler is set at thief hole, and the sampler is with female Luer 0.5mm outer diameters
No. 5 sampling probes, sampling probe syringe needle by the thief hole of upper cover be inserted vertically into simulation water-bearing layer, sampling probe is consolidated using silicon rubber
It is scheduled on lid, the other end is connect with the check valve with female Luer, and the external tapping of check valve connects disposable syringe.
Above-mentioned injection device includes electric mixer, beaker and peristaltic pump b；When injection, nano-particle is placed in beaker
Add deionized water to keep stirring, prevents precipitation of material, and pump line one end of 4.8mm outer diameters is placed in beaker by peristaltic pump and is received
Below rice corpuscles suspension, the injection orifice of the other end and 4.8mm connect.
Above-mentioned apparatus assessment nano-particle migrates in underground environment and returns the method for the simulated experiment to become, and experimental procedure is such as
Under：(1) reactor cleaning and leak detection：Groove body and each accessory are cleaned, first cleaned using suds, deionized water punching
It defoams；With 10% salpeter solution rinse, and remained on surface acid is washed with deionized water；Finally rinsed 3 times with deionized water；It will
Injector well, monitoring well and sampling probe etc. all fix, and the analogue experiment installation is connected, and keep groove body static full of water
12h hunts leak；(2) media filler：By the way of wet method filling, the specific steps are：5cm heads are injected in groove body, are used
Beaker is sprinkled into the filled media of 1~2cm cleanings, and the medium is quartz sand, the partial compaction that will be had been filled with the wooden pestle, then is noted
Water, filling quartz sand make the reactor after filling be stood in the state of saturation for 24 hours to reactor head, then by top sky
Quartz sand is filled up in the part gone out again, finally covers upper cover and is sealed；(3) it is pumped into deionized water：Via peristaltic pump will go from
Sub- water is pumped into from water supply installation in reactor, is cleaned to system；By peristaltic pump, enter pond, discharge bay height of water level, storage
The hydraulic parameters in the water outlet height control simulation water-bearing layer of water installations；According to the infiltration coefficient of filled media, simulation water-bearing layer
Hydraulic gradient and reactor cross section product, pass through Darcy's law calculate determine peristaltic pump setting flow velocity；According to the simulation of setting
Aquifer water force gradient makes to stablize into pond, water outlet pool water level and head by adjusting the water outlet height of water level regulation slot；
Make 48~96h of system stable operation；(4) it is pumped into polluted underground water：After system stable operation, it is pumped into polluted underground water, the process
Duration >=96h, pollutant is made to be uniformly distributed in the reactor；(5) nano-particle is injected：It is continuously pumped into polluted underground water
Afterwards, sampling analysis pollutant initial concentration, when each monitoring point concentration distribution of pollutants uniformly and with pollutant in water supply installation
When initial concentration is consistent, the nano-particle of the pollutant can be effectively repaired via the injection orifice injection of upper cover by injection device
As medicament is repaired, carried out by the ion concentration mode for detecting different monitoring points pollutant residual concentration, nano-particle generates
Quantitative analysis, or the regularity of distribution of view mode qualitative analysis nano-particle by visual observation, to assess nano-particle in underground ring
Migration in border and return the repair process for becoming and simulating based on in-situ injection nano-particle to polluted underground water；Wherein：
1) injection rate：The injection rate of nano-particle should be less than water-bearing layer groundwater velocity, to keep flowing in water-bearing layer
It is fast uniform；
2) injection volume and injection concentration：The batch experiment result of study that pollutant is repaired according to nano-particle, is removed
Pollutant amount and nano-particle quality ratio, it is total further according to the polluted underground water volume and pollutant of this simulated experiment
Amount, is calculated the injection volume of nano-particle needed for simulated experiment, the calculation of volume injected is as follows：
V=π × r2×h×θ
In formula：V is nano-particle volume injected, Unit/mL；π is pi, dimensionless constant；R is the design of injector well
The radius of influence, unit cm；H is height for reactor, unit cm；θ is that porosity, dimensionless, by injection volume and note are moved in water-bearing layer
Beam accumulates and then determines the injection concentration of nano material needed for certain volume and the polluted underground water of concentration；
3) it maintains water-in and water-out flow speed stability, head to stablize during system operation, is adopted with disposable syringe every 2~12h
Water sample in monitoring well is taken, ion concentration and pollutant concentration that nano-particle generates are measured, nano-particle in water-bearing layer is obtained and exists
Transport on room and time, and its remediation efficiency to pollutant；
(6) underground water sample volume and rate：According to nano-particle and pollutant analysis method and groundwater velocity size
Sample volume and sampling rate are set：To reduce influence of the sampling to aqueous lamellar field, sample volume should meet concentration analysis
On the basis of it is small as possible；Sampling rate should be sufficiently low, is no more than the 5% of water-bearing layer water velocity.
Advantageous effect：(1) apparatus of the present invention can (including water-bearing layer be permeated according to the hydrological geological conditions of practical contaminated site
Coefficient, groundwater velocity, hydraulic gradient etc.), laboratory experiment parameter, fortune of the accurate simulation nano-particle in underground environment are set
It moves and its to the dynamic process of polluted underground water reparation.(2) injector well and monitoring well are fixed on reactor chamber by this simulator
Body bottom so that the positioning of well is more accurate, avoids water-bearing layer filling process and causes to move to it.(3) it is directed to nanometer suspension
The characteristics of, the injection device in this simulator is equipped with blender and peristaltic pump etc., can not only prevent precipitation of material, but also can make to receive
Rice corpuscles is continuously injected into simulation water-bearing layer with given pace, enhances the controllability of experimentation.(4) different by injecting
Nano-particle (such as nano magnesia and its modified material, nano aluminium oxide and its modified material), more scientifically shows
Influence of hydraulic conductivity of the nano material in aquifer to pollutant repairing effect.(5) sampling side of the invention
Method more science, by controlling sampling frequency, sample size and rate, experimentation has been reduced as far as sampling to aqueous laminar flow
The man's activity of water field.(6) apparatus of the present invention flexible design, easy to operate, highly practical, can largely reduce pollution
The indoor simulation cost of underground water in-situ immobilization, improves the working efficiency of analog study.(7) present invention is not limited solely to simulate certain
The migration in underground environment of kind of nano-particle and return, be also applied for based on in-situ injection nano-particle to any organic/nothing
The reparation of machine polluted underground water is simulated, and has widely application value.
Description of the drawings
Fig. 1 is the structural schematic diagram of simulator of the present invention；
Fig. 2 is reactor vertical view；
Fig. 3 is that cadmium concentration changes with time figure in monitoring well A7, B7, AB3 and AB4 after nano magnesia injection；
Cadmium concentration changes with time figure in monitoring well A9, B9, A10 and B10 after the injection of Fig. 4 nano magnesias；
The magnesium ion concentration that unmodified and modified Nano magnesia generates in Fig. 5 difference monitoring wells B7, B8, B9 and B10 with
The variation diagram of time；
(black portions aoxidize the visual observation chart of the migration situation of nano-particle for modified Nano in figure in Fig. 6 reactors
Magnesium).
Liquid storage bottle 1, peristaltic pump a 3, sampling valve a 4, reactor 5, enters pond 6, discharge bay 7, filter 8, note at flowmeter 2
Well 9, monitoring well 10, upper cover 11, injection orifice 12, thief hole 13, valve 14, sampling valve b 15, water level regulation slot 16, waste liquid is penetrated to receive
Collect bottle 17, electric mixer 18, beaker 19, peristaltic pump b 20.
Specific implementation mode
The following examples can make those skilled in the art that the present invention be more fully understood, but not limit this in any way
Invention.
Embodiment 1
As shown in Fig. 1~2, a kind of assessment nano-particle of the invention migrates in underground environment and returns the simulated experiment to become
Device includes mainly water supply installation, reactor 5, injection device, sampler and water-storing device, and wherein water supply installation includes pipe
Road sequence connected liquid storage bottle 1, flowmeter 2 and peristaltic pump a 3, water supply installation are connected by pipeline with pond 6 is entered again, the pipe
Road is equipped with sampling valve a 4；Peristaltic pump is for adjusting reactor flow of inlet water, and optional more pump head peristaltic pump systems can be simultaneously
Injection device and several parallel analogue experiment installations are supplied, range of flow is that 0.21~21mL/min (select beautiful by the present embodiment
Cole-Parmer instrument companies of state Masterflex L/S types peristaltic pump system).Flowmeter for monitor flow of inlet water whether with
It is consistent that flow is arranged in peristaltic pump.
Reactor is a rectangular organic glass groove body for carrying upper cover 11, and organic glass plate thickness is 1cm, reactor ruler
Very little is 60cm × 50cm × 11cm, is divided into space in groove body by two vertical filters 8 in groove body and contains into pond 6, simulation
Water layer and discharge bay 7；Simulation water-bearing layer size is 50cm × 50cm × 11cm, and it is 5cm × 5cm to enter pond and water outlet pool size
×11cm.The water supply installation is connected with pond is entered, and the water-storing device is connected with discharge bay, simulation intake area domain in groove body
Upstream be equipped with injector well 9, monitoring well 10 is provided in groove body, position corresponding with injector well is equipped with injection orifice 12 on upper lid,
Position corresponding with monitoring well is equipped with thief hole 13, and the injection device is connect with injection orifice, the sampler and thief hole
Connection；
The injector well and monitoring well are the stainless steel screen casing with bar shaped screen slot, and screen slot is less than 0.106mm, screen casing wall thickness
0.8mm, injector well internal diameter are 1.5cm, and high 11cm, monitoring well internal diameter is 1cm, high 11cm.Injector well and monitoring well utilize waterproof
Shaft bottom and groove body bottom are firmly bonded by silicone sealant vertically.
Enter the position that pond and discharge bay have a common boundary with simulation water-bearing layer respectively and be equipped with groove, above-mentioned filter is by thick 5mm's
Poly (methyl methacrylate) plate frame and 150 mesh stainless steel cloths (0.106mm) are constituted, and stainless steel cloth passes through waterproof silicone seal gluing knot
It is fixed on poly (methyl methacrylate) plate frame, then is inserted into reactor and enters pond/discharge bay and the setting of water-bearing layer boundary position
In groove.Enter in pond and discharge bay fill grain size be 1.5~4cm cobblestone, prevent simulation water-bearing layer area filling after every
The side extrusion of net device.
Upper cover is the poly (methyl methacrylate) plate of thickness 5mm, which is provided with the injection orifice that aperture is 4.8mm and the sampling that aperture is 1mm
The position of hole, injection orifice and thief hole and quantity are corresponding with injector well and monitoring well respectively；Injection orifice connects injection device and uses
In injection nano-particle as medicament is repaired, sampler is set at thief hole；The sampler is with female Luer
No. 5 sampling probes of 0.5mm outer diameters, sampling probe syringe needle are inserted vertically into water-bearing layer by the thief hole of upper cover, will be taken using silicon rubber
Sample needle is fixed on lid, and the other end is connect with the check valve with female Luer, the disposable note of external tapping connection of check valve
Emitter.
Injection device includes electric mixer 18, beaker 19 and peristaltic pump b 20；When injection, nano-particle is placed in beaker
In plus deionized water keep stirring, prevent nano-particle from precipitating, and pump line one end of 4.8mm outer diameters is placed in burning by peristaltic pump
In cup below nano-particle suspension, the injection orifice of one end and 4.8mm connect；A certain amount of nano-particle is continuous with given pace
It is injected into simulation water-bearing layer.
Water-storing device includes rectangular water level regulating tank 16 and waste collection bottle 17, and discharge bay passes through pipeline and rectangular water level tune
Slot connection is saved, pipeline is equipped with valve 14 and sampling valve b 15, and water level regulation slot is equipped with the water outlet for fixing water level.
Embodiment 2
It is a kind of to utilize analogue experiment installation described in embodiment 1, the nano magnesia of progress migrate in underground environment with
Return to become and its analogue experiment method of the restoring cadmium polluted underground water of in-situ injection is as follows：
2 mouthfuls of injector wells are set in simulation water-bearing layer region, well spacing is 20cm.If 8 arrange totally 30 mouthfuls of monitoring wells, wherein 2 row
In injector well upstream, 1 row flush monitoring well with injector well, remaining 5 is listed in injector well downstream, and specific distribution and number are such as Fig. 2 institutes
Show.
In experimentation, reactor upper cover is opened, using fine sand as water-bearing layer, reactor is packed into using wet method filling mode
In simulation water-bearing layer region, the specific steps are：5cm heads are first injected in groove body, and the thin of 1~2cm cleanings is sprinkled into beaker
Sand, the partial compaction that will be had been filled with the wooden pestle, then water filling, filling fine sand, are repeated several times until filling is to reactor head, then
So that the reactor after filling is stood in the state of saturation for 24 hours, fine sand is then filled up into the part that top is vacated again, is finally covered
Upper cover is simultaneously sealed.
After system sealing, it is pumped into reactor from water supply installation by deionized water, system is cleaned.Meanwhile passing through
The hydraulic parameters in water-bearing layer are simulated in the water outlet height control of peristaltic pump, entry/exit water level in water pool height, water-storing device, pass through tune
The water outlet height of water-saving position regulating tank makes in/out water level in water pool and head stablize.Make system stable operation 96h.Wait for that system is steady
After fixed, simulation cadmium pollution underground water is pumped into the rate of 2mL/min, which continues 96h, sampling analysis cadmium initial concentration, when
Each monitoring point cadmium concentration be evenly distributed and it is consistent with the initial concentration of cadmium in water supply installation when, by injection device via upper cover
Two injection orifices inject nano magnesia with the injection rate of 2mL/min, and cadmium pollution underground water of the simulation based on in-situ injection is repaiied
Multiple process.This object of experiment is the cadmium pollution simulated groundwater for repairing a concentration of 200 μ g/L of 10L, i.e. 2mg cadmiums, according to nanometer
Magnesia repairs the batch experiment result of study of cadmium, and nano magnesia is 1.99mg/g to the removal amount of cadmium, therefore removes 2mg's
The amount of nano magnesia needed for cadmium is 1g.The design radius of influence of every mouthful of injector well is 8cm, and mobile porosity is 0.23, according to
The volume injected that each well is calculated in formula is about 500mL, i.e., every mouthful of injector well needs the nanometer of a concentration of 1g/L of 500mL
Magnesia, therefore simulated experiment will at least be run 3.5 days, wherein nano magnesia need to inject 4.2h.If after operation 3.5 days, receive
Rice magnesia still has higher remediation efficiency to cadmium, then continues to be pumped into cadmium pollution simulated groundwater, until near injector well
Monitoring well in cadmium concentration increase to over《Groundwater quality standard》(GB/T 14848-95) Group III water quality standard 0.01mg/L, mould
Draft experiment terminates.
During simulation system is run, first 3 days after maintaining Inlet and outlet water flow speed stability, medicament injection to start, per 2h with primary
Property syringe takes water sample 0.2mL from 30 monitoring wells, magnesium ion concentration and cadmium concentration therein is measured, according to daily sample
Product measurement result, adjustment sample interval are 4h, 6h, 8h, 12h.Using said determination data, different time nanometer can be drawn
The repairing effect (Fig. 3-4) of cadmium in the migration situation and different spaces of magnesia.As shown in Figure 3 and Figure 4, two monitorings of A7 and B7
The cadmium concentration of point is always held at reduced levels after nano-particle injection, mainly since A7 and B7 is located under injector well
Closer location is swum, nanoparticle migration to neighbouring position has carried out effective reparation to cadmium；And other point cadmium concentrations are first in injection
Phase declines then to go up rapidly, illustrates the nanoparticle migration of only less (or not having) so far, so there is cadmium concentration rise
Phenomenon, but A10 and B10, away from injector well most far 30cm, cadmium concentration also has reduction, illustrates that nano-particle has stronger migration
Performance, downstream is polluted at a distance also has repairing effect.
Embodiment 3
Another kind is transported using analogue experiment installation described in embodiment 1, the modified Nano magnesia of progress in underground environment
It moves and returns to become and its analogue experiment method of the restoring cadmium polluted underground water of in-situ injection, same as Example 2, the nanometer injected
Particle is different, accordingly can be relatively more modified with the migration performance of unmodified nano magnesia and its to cadmium pollution groundwater remediation
The similarities and differences of effect.Fig. 5 shows that the magnesium ion concentration that modified Nano magnesia generates is far above unmodified nano magnesia, modified
Nano magnesia is to the repairing effect of cadmium also superior to unmodified nano magnesia.In addition, to the simulation water-bearing layer after reparation every
2.5cm excavates section, observes the migration situation (Fig. 6) of nano-particle, it can be seen that nano-particle, which is not apparent from, to be migrated to away from injection
At the 7.5cm of well upstream, and away from the presence that nano-particle still can be observed at the 32.5cm of injector well downstream, demonstrate nano-particle compared with
Strong migration performance.
Embodiment 4
Another kind using analogue experiment installation described in embodiment 1, the nano aluminium oxide of progress migrate in underground environment with
Return and become and its analogue experiment method of the restoring cadmium polluted underground water of in-situ injection, substantially the same manner as Example 2, difference exists
In：
This experiment shares the cadmium pollution simulated groundwater of a concentration of 200 μ g/L of 10L, and cadmium is repaired according to nano aluminium oxide
Batch experiment result of study, every mouthful of injector well needs the nano aluminium oxide of a concentration of 1.2g/L of 500mL, and (0.6g is nano oxidized
Aluminium).
Claims (8)
1. a kind of assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become, it is characterised in that including supplying water
Device, reactor (5), injection device, sampler and water-storing device, the reactor are a slot for carrying upper cover (11)
Body, groove body is interior to be divided into space in groove body into pond (6), simulation water-bearing layer and discharge bay by two vertical filters (8)
(7)；The water supply installation is connected with pond is entered, and the water-storing device is connected with discharge bay, simulation intake area domain in groove body
Upstream is equipped with injector well (9), and monitoring well (10) is provided in groove body, and position corresponding with injector well is equipped with injection orifice on upper lid
(12), position corresponding with monitoring well is equipped with thief hole (13), and the injection device connect with injection orifice, the sampler and
Thief hole connects.
2. assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become according to claim 1, special
Sign is that the water supply installation includes connected liquid storage bottle (1), flowmeter (2) and the peristaltic pump a (3) of pipeline sequence, water supply installation
It is connected again with pond (6) is entered by pipeline, the pipeline is equipped with sampling valve a (4).
3. assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become according to claim 1, special
Sign is that the water-storing device includes water level regulation slot (16) and waste collection bottle (17), and discharge bay passes through pipeline and water level regulation
Slot connects, and pipeline is equipped with valve (14) and sampling valve b (15), and water level regulation slot is equipped with the water outlet for fixing water level.
4. assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become according to claim 1, special
Sign is the injector well and monitoring well is the stainless steel screen casing with bar shaped screen slot, and screen slot is less than filled media grain size, screen casing
Wall thickness 0.8mm, injector well internal diameter are 1.5cm, and monitoring well internal diameter is 1cm；Injector well and monitoring well pass through waterproof silicone sealant
Shaft bottom and groove body bottom are bonded vertically.
5. assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become according to claim 1, special
Sign is that the filter is made of poly (methyl methacrylate) plate frame and stainless steel cloth, and stainless steel cloth passes through waterproof silicone seal gluing
Knot is fixed on poly (methyl methacrylate) plate frame, it is described enter the position that has a common boundary respectively with simulation water-bearing layer of pond and discharge bay be equipped with it is recessed
Slot, poly (methyl methacrylate) plate frame insert in groove；Enter the cobblestone for filling that grain size is 1.5~4cm in pond and discharge bay.
6. assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become according to claim 1, special
Sign is that the upper cover is the poly (methyl methacrylate) plate of thickness 5mm, and which is provided with injection orifice that aperture is 4.8mm and aperture is taking for 1mm
The position of sample hole, injection orifice and thief hole and quantity are corresponding with injector well and monitoring well respectively；Injection orifice connects injection device
It is used to inject nano-particle afterwards, sampler is set at thief hole, the sampler is with female Luer 0.5mm outer diameters
No. 5 sampling probes, sampling probe syringe needle are inserted vertically into simulation water-bearing layer by the thief hole of upper cover, are fixed sampling probe using silicon rubber
On upper lid, the other end is connect with the check valve with female Luer, and the external tapping of check valve connects disposable syringe.
7. assessment nano-particle migrates in underground environment and returns the analogue experiment installation to become according to claim 1, special
Sign is that the injection device includes electric mixer (18), beaker (19) and peristaltic pump b (20)；When injection, by nano-particle
It is placed in beaker plus deionized water is kept stirring, prevent precipitation of material, and set pump line one end of 4.8mm outer diameters by peristaltic pump
In beaker below nano-particle suspension, the injection orifice of the other end and 4.8mm connect.
8. being migrated in underground environment using any described device assessment nano-particle of claim 1~7 and returning the simulation to become real
The method tested, it is characterised in that experimental procedure is as follows：
(1) reactor cleaning and leak detection：Groove body and each accessory are cleaned, first cleaned using suds, deionized water
Wash away foam；With 10% salpeter solution rinse, and remained on surface acid is washed with deionized water；Finally rinsed 3 times with deionized water；
Injector well, monitoring well and sampling probe etc. are all fixed, and the analogue experiment installation is connected, keeps groove body quiet full of water
Only 12h hunts leak；
(2) media filler：By the way of wet method filling, the specific steps are：5cm heads are injected in groove body, and 1 is sprinkled into beaker
The filled media of~2cm cleanings, the medium are quartz sand, the partial compaction that will be had been filled with the wooden pestle, then water filling, filling quartz
Sand makes the reactor after filling be stood in the state of saturation for 24 hours to reactor head, then fills out the part that top is vacated again
Full quartz sand, finally covers upper cover and is sealed；
(3) it is pumped into deionized water：Deionized water is pumped into from water supply installation in reactor via peristaltic pump, system is carried out clear
It washes；By peristaltic pump, enter pond, discharge bay height of water level, water-storing device water outlet height control simulation water-bearing layer waterpower
Parameter；According to the infiltration coefficient of filled media, the hydraulic gradient in simulation water-bearing layer and reactor cross section product, pass through Darcy's law meter
Calculate the setting flow velocity for determining peristaltic pump；According to the simulation aquifer water force gradient of setting, by the water outlet for adjusting water level regulation slot
Open height makes to stablize into pond, water outlet pool water level and head；Make 48~96h of system stable operation；
(4) it is pumped into polluted underground water：After system stable operation, it is pumped into polluted underground water, which makes dirt
Dye object is uniformly distributed in the reactor；
(5) nano-particle is injected：After being continuously pumped into polluted underground water, sampling analysis pollutant initial concentration, when the dirt of each monitoring point
When dye concentration profile is uniform and consistent with the initial concentration of pollutant in water supply installation, by injection device via the note of upper cover
The nano-particle that perforation injection can effectively repair the pollutant is used as reparation medicament, residual by detecting different monitoring points pollutant
The ion concentration mode that remaining concentration, nano-particle generate carries out quantitative analysis, or view mode qualitative analysis nanometer by visual observation
The regularity of distribution of particle, to assess migration of the nano-particle in underground environment and return to become and simulate based on in-situ injection nanoparticle
Repair process of the son to polluted underground water；Wherein,
1) injection rate：The injection rate of nano-particle should be less than water-bearing layer groundwater velocity, to keep flow velocity in water-bearing layer equal
It is even；
2) injection volume and injection concentration：The batch experiment result of study of pollutant, the dirt removed are repaired according to nano-particle
The ratio for contaminating the amount and nano-particle quality of object, further according to the polluted underground water volume and the total amount of pollutant of this simulated experiment, meter
The injection volume for obtaining nano-particle needed for simulated experiment is calculated, the calculation of volume injected is as follows：
V=π × r2×h×θ
In formula：V is nano-particle volume injected, Unit/mL；π is pi, dimensionless constant；R, which is the design of injector well, to be influenced
Radius, unit cm；H is height for reactor, unit cm；θ is that porosity, dimensionless, by injection volume and injecting body are moved in water-bearing layer
Product and then the injection concentration for determining nano material needed for certain volume and the polluted underground water of concentration；
3) it maintains water-in and water-out flow speed stability, head to stablize during system operation, prison is taken with disposable syringe every 2~12h
Water sample in well logging measures ion concentration and pollutant concentration that nano-particle generates, and nano-particle is in space in acquisition water-bearing layer
With temporal Transport, and its remediation efficiency to pollutant；
(6) underground water sample volume and rate：It is arranged with groundwater velocity size according to nano-particle and pollutant analysis method
Sample volume and sampling rate：To reduce influence of the sampling to aqueous lamellar field, sample volume should be in the base for meeting concentration analysis
It is small as possible on plinth；Sampling rate should be sufficiently low, is no more than the 5% of water-bearing layer water velocity.
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