CN103926172B - For simulating experimental provision and the method for the surfactant enhanced remediation process of DNAPL pollutant in water-bearing zone - Google Patents
For simulating experimental provision and the method for the surfactant enhanced remediation process of DNAPL pollutant in water-bearing zone Download PDFInfo
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Abstract
The present invention relates to a kind of experimental provision and method of the surfactant enhanced remediation process for simulating DNAPL pollutant in water-bearing zone.The present invention adopts two-dimensional visualization sandbox modeling water-bearing zone, can directly observe and record DNAPL Pollution Plume in vertical and horizontal direction migration, and quantitatively calculate the diffusion area change of pollutant, remediation efficiency estimation and contaminant transportation risk control have visual advantage directly perceived, can in the kind of engineering Optimization Technology in early stage especially preferred surfactant and concentration thereof.
Description
Technical field
The present invention relates to technical field of environment pollution control, being specifically related to a kind of experimental provision and method of the surfactant enhanced remediation process for simulating DNAPL pollutant in water-bearing zone.
Background technology
Along with the development of chemical engineering industry, in the production of product, transport, storage and use procedure, there is a large amount of toxic organic compounds to enter in soil and groundwater environment every year, become the polluter that a class is important.Dense non-aqueous phase liquids (DNAPL) density ratio water is wherein large, often penetrates aeration zone and enters saturated aquifer.When moving downwards in saturated aquifer, possibly cannot penetrate when running into the thinner soil horizon of particle diameter, pile up and form DNAPL accumulation area thereon.Due to 1, the DNAPL of 2-DCA and PCE and so on has the interfacial tension between lower water solubility and higher and water, traditional pump-and-treat system method is not good to its repairing effect, the more method of current employing adds surfactant to carry out strengthening pump-and-treat system (SurfactantEnhancedAquiferRemediation is called for short SEAR).The principle of SEAR technology is by adding surfactant, improve solubleness in water of indissoluble organic contaminant and movability, by the hydraulic gradient that the extraction well be located in water-bearing zone causes, pollutant mixed liquor is drawn into earth's surface to carry out being separated, processing, finally water up to standard after process is arranged outward or is again circulated in underground water.
Use SEAR technology to DNAPL process, when surfactant solution flows through DNAPL aggregation, mobilization and solubilization two kinds of processes may be there are simultaneously.Research is in the past thought mostly, and mobilization may cause the vertical migration of DNAPL, and Pollution Plume is expanded further, therefore usually pursues higher solubilizing effect when option table surface-active agent, mostly suppresses for the effect reducing oil water interfacial tension as far as possible.In order to suppress surfactant to the mobilization of DNAPL, need a large amount of previous experiments to select suitable proportion of surfactant.Even now, after adding surfactant in actual repair process, the diffusion mobility of DNAPL is difficult to avoid completely.If repair with solubilising principle, reach higher solubilizing effect generally needs very high surfactant injected volume, also brings surfactant to the pollution of soil and ecological risk while high cost.In addition, in the underground reservoir of place the structure of porous medium, particle diameter and pore diameter distribution etc. all the solubilising of Surfactant and incremental effect exist and affect.Therefore select suitable surfactant to improve remediation efficiency according to the pollutant composition in actual place and hydrological geological conditions, reduce the emphasis that dosage of surfactant is SEAR technology.
In order to the solubilising of Surfactant and mobilization are assessed, recovery project needs to carry out simulated experiment early stage.Simulated experiment in the past much adopts one dimension column experiments, although the solubilizing effect of the good proof list surface-active agent of energy, but add the migration situation of DNAPL Pollution Plume after surfactant owing to being difficult to directly observation, the mobilization of Surfactant and be difficult to assess accurately on the impact of remediation efficiency.The two-dimentional sandbox of the more employing of simulated experiment afterwards, not only can nonuniformity in simulate formation water-bearing zone and impact thereof, and intuitively can observe the migration flowing adding DNAPL Pollution Plume after surfactant.
Existing two-dimentional sandbox experimental provision comes with some shortcomings, and the pollutant in such as Extract does not just directly discharge through process, does not have good means to test pollutant distribution area in sandbox easily.(Taylor, the T.P. such as Taylor; Pennell, K.D.; Abriola, L.M.; Dane, J.H., Surfactantenhancedrecoveryoftetrachloroethylenefromaporo usmediumcontaininglowpermeabilitylenses:1.Experimentalst udies.JournalofContaminantHydrology2001,48, (3-4), two-dimentional sandbox 325-350.) designed is made up of unorganic glass plate and aluminium alloy, but this device lacks circular processed portion and digital image imaging analysis part.
Domestic Lee Sui etc. (Lee Sui etc. the experimental study that process DNA plerosis PL pollutes water-bearing zone is extracted in surfactant strengthening. Jilin University, 2008.) the water-bearing zone experimental provision designed is the closed rectangular channel made by polyvinyl chloride panel, be designed specifically to: seepage flow flute length is 120cm, wide is 32cm, height is 56cm, respectively there is the wide water distribution space for 6cm on both sides, and dividing plate being densely covered with diameter is 0.15cm water distributing pore.Trough front be furnished with 10 row 6 row totally 60 diameters be the thief hole of 2cm.Inlet opening is in the lower left corner in trough front, and apopore is in the position of another side distance bottom land 24cm.The thickness of this device reaches 32cm, does not belong to the yardstick category of two-dimentional sandbox, and sampling by the thief hole in front, can only can produce interference to the flow field in sandbox, and lack circular processed portion and digital image imaging analysis part.
The present invention be recovery project early stage repairing condition optimization and repair result simulate the visual Quantitative research method of providing convenience.Engineering was in earlier stage in order to the proportioning of optimizing surface activating agent carried out one dimension column experiments mostly in the past, although the solubilizing effect of the good proof list surface-active agent of energy, but add the migration situation of DNAPL Pollution Plume after surfactant owing to being difficult to directly observation, the mobilization of Surfactant and be difficult to assess accurately on the impact of remediation efficiency.This method adopts two-dimensional visualization sandbox modeling water-bearing zone, can directly observe and record DNAPL Pollution Plume in vertical and horizontal direction migration, and quantitatively calculate the diffusion area change of pollutant, remediation efficiency estimation and contaminant transportation risk control have visual advantage directly perceived, accordingly can in the kind of engineering Optimization Technology in early stage especially preferred surfactant and concentration thereof.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, proposing a kind of experimental provision and method of the surfactant enhanced remediation process for simulating DNAPL pollutant in water-bearing zone.
For reaching this object, the present invention by the following technical solutions:
An object of the present invention is the experimental provision providing a kind of surfactant enhanced remediation process for simulating DNAPL pollutant in water-bearing zone, and described device comprises two-dimensional visualization sandbox, the circulation system and surfactant adding apparatus.
Described two-dimensional visualization sandbox upward opening, its transversely by band filter opening baffle for separating be the tank at two ends and the sand launder of centre; Described two-dimensional visualization sandbox front is provided with timing image-taking device.Be water white transparency unorganic glass before and after two-dimensional visualization sandbox of the present invention, both sides and bottom are colourless transparent resin glass bar, to form two-dimentional sandbox.Seal both sides and bottom with glass cement, its opening is used for back-up sand and adds pollutant.The dividing plate of described band filter opening can select the organic glass bar of band filter opening, can make water through.Described timing image-taking device is connected to after setting exposure parameter on computer before digital camera can being positioned over sandbox, utilizes the capture of Nikontrol3k software timing.
The described circulation system comprises activated-charcoal column, water tank and is placed in pumped well simulative tube and the inverted well simulative tube of two-dimensional visualization sandbox two ends tank respectively, the bottom of described pumped well simulative tube access activated-charcoal column, the top of activated-charcoal column is communicated with water tank, water tank connects inverted well simulative tube again, to form circulation path;
Described surfactant adding apparatus is connected in water tank, to add surfactant solution in water tank.
The first peristaltic pump and T-valve is provided with successively between bottom described pumped well simulative tube and activated-charcoal column; The second peristaltic pump is provided with between described water tank and inverted well simulative tube.Utilize the suction pump in peristaltic pump simulation Practical Project, can regulate the flow velocity that draws water.The Main Function of T-valve is timing water sampling in simulation process, to detect the concentration change of analyzing DNA PL pollutant.
The 3rd peristaltic pump is provided with between described surfactant adding apparatus and water tank.The effect of the 3rd peristaltic pump is to add surfactant solution in water tank.
The inwall of described two-dimensional visualization sandbox adopts frosting, avoids wall effect occurs.
Described two-dimensional visualization sandbox rear is arranged with transmitted light source in parallel.For eliminating the interference of sandbox surface reflection light, experiment is carried out in dark surrounds, and at sandbox rear, parallel placement lamp box is as light source, lamp box length and width, highly all consistent with sandbox, built-in 4 fluorescent tubes of lamp box, derive light to ensure uniform light with even tabula rasa.
The top layer of described activated-charcoal column and bottom cover rubble, central filler cocoanut active charcoal.Through experimental verification, activated-charcoal column can DNAPL pollutant effectively in planar water and surfactant, avoids directly discharging Extract and pollutes.
Described pumped well simulative tube and inverted well simulative tube are the plexi-glass tubular that bottom arranges filter opening.
Two of object of the present invention is to provide a kind of experimental technique utilizing described experimental provision to simulate the surfactant enhanced remediation process of DNAPL pollutant in water-bearing zone, and described experimental technique comprises the following steps:
1) to water filling in two-dimensional visualization sandbox;
2) under water-saturated state to uniform filling rubble sand in sand launder; In the filling process, fine quartz layer of sand is set to simulate aquitard, it injects dyed DNAPL pollutant, form aggregation; Continue to fill below rubble sand to the water surface;
3) drawn water to activated-charcoal column from two-dimensional visualization sandbox by pumped well simulative tube, flow in water tank after adsorption treatment; Water in water tank is poured in inverted well simulative tube, form circulation; Two-dimensional visualization sandbox middle water level is made to keep stable in cyclic process;
4) calculate according to the flowmeter of water in the circulation system amount adding surfactant solution in the unit interval in water tank, make the concentration of surfactant solution in water tank keep constant;
5) timing water sampling between pumped well simulative tube and activated-charcoal column, the concentration change of analyzing DNA PL pollutant also makes curve map, and evaluation form surface-active agent strengthens the efficiency of repairing DNAPL pollutant in water-bearing zone;
6) digital image of record is analyzed; According to metamorphosis and the distribution area of DNAPL Pollution Plume, the risk of assessment DNAPL diffusion mobility.
Rubble sand of the present invention and fine quartz sand are comparatively speaking.Those skilled in the art, in order to form aquitard in rubble sand, can select the particle diameter of rubble sand and fine quartz sand according to prior art.Such as, the rubble sand of 0.95mm or 0.60mm can be selected as porous medium, select the fine quartz sand of 0.30mm as aquitard.
The present invention does not do particular/special requirement to the position of aquitard in rubble sand, and those skilled in the art should select according to the strata condition of reality.
" water-saturated state " of the present invention refers in two-dimensional visualization sandbox after water filling, and in water, uniform filling rubble sand, is filled to below the water surface.Filling process carries out from start to finish under water-saturated state, to prevent there is bubble in the hole of silica sand.
After aquitard injecting dyed DNAPL pollutant, enter osmotic pressure due to what do not reach this aquitard particulate medium, pollutant is retained formation aggregation by aquitard.
Described experimental technique carries out in dark surrounds, opens transmitted light source, to make to inject two-dimensional visualization sandbox uniform light everywhere after experiment starts.
Described rubble sand uses 0.05mol/LNaOH, 0.05mol/LHNO before filling successively
3, 5% hydrogen peroxide soaks 3h respectively, more repeatedly rinses rear natural air drying with deionized water.
Described fine quartz layer of sand is preferably convex arc downwards.This design can make pollutant be trapped formation aggregation on fine quartz layer of sand, avoids pollutant to both sides diffusive migration, thus can evaluate the risk of DNAPL diffusion mobility better after experiment starts.
Described DNAPL pollutant Sudan IV dyes.Sudan IV has been widely used in the dye tracing experiment of NAPL pollutant, and beaker experiments proves that the DNAPL of Sudan IV dyeing can not be decoloured by surfactant.
The present invention by T-valve timing water sampling, by the concentration change of By Headspace Gas Chromatography DNAPL pollutant.
In physical simulation experimentation, the present invention can select 1,2-DCA and PCE is as DNAPL pollutant, select neopelex (SDBS) as surfactant, by changing DNAPL pollutant type, thick quartz sand particle size, surfactant concentration, the factors such as flow velocity of drawing water, to the surfactant enhanced remediation process simulation of DNAPL pollutant in water-bearing zone, with in engineering Optimization Technology in the early stage especially kind of preferred surfactant and concentration thereof.
Such as, by adding surfactant and the process not adding water pumping experiment in surfactant situation in the rubble sand of two kinds of different-grain diameters respectively, examination surfactant is to the enhancing removal effect of DNAPL, and the Surfactant such as self physicochemical property of DNAPL pollutant, porous medium particle diameter strengthens the impact of solubilising and mobilization in repair process.
Drawn water in difference respectively in the rubble sand two dimension sandbox of two kinds of particle diameters by record DNAPL pollutant the process of flow velocity and water pumping experiment under the surfactant solution condition adding variable concentrations, examination different surfaces activating agent throws in the diffusion mobility of DNAPL in SEAR process under concentration, draw water flow velocity and porous medium particle diameter condition to the impact of extracting efficiency out.
Compared with prior art scheme, the present invention has following beneficial effect:
1, the present invention adopts two-dimensional visualization sandbox modeling water-bearing zone, can directly observe and record DNAPL Pollution Plume in vertical and horizontal direction migration, and the diffusion area change of pollutant is quantitatively calculated by Digital image analysis method, remediation efficiency estimation and contaminant transportation risk control have visual advantage directly perceived, accordingly can in engineering in earlier stage according to kind and the concentration thereof of place situation Optimization Technology especially preferred surfactant.
2, have employed activated-charcoal column process Extract, make whole pump-and-treat system system become the circulation system.
3, the inwall of sandbox adopts frosting, thus effectively prevent wall effect, and the migration of DNAPL on two-dimentional yardstick no longer only occurs near wall, but evenly carries out on whole sandbox thickness.
4, adopt transmitted light source, and have employed even tabula rasa, ensure to inject sandbox uniform light everywhere.Experiment is carried out in dark surrounds, can eliminate the interference of sandbox reflection of glass surface light, comes from extraneous error little as far as possible when making the later stage carry out quantitative test to experimental image.
Accompanying drawing explanation
Fig. 1 is the structural representation of experimental provision of the present invention;
Fig. 2 is the pictorial diagram of experimental provision of the present invention: (a) front view (FV); (b) outboard profile;
Fig. 3 is the process flow diagram of experimental technique of the present invention.
In figure: 1-two-dimensional visualization sandbox; 2-surfactant adding apparatus; 3-pumped well simulative tube; 4-inverted well simulative tube; 5-activated-charcoal column; 6-water tank; 7-first peristaltic pump; 8-T-valve; 9-second peristaltic pump; 10-the 3rd peristaltic pump.
The present invention is described in more detail below.But following example is only simple and easy example of the present invention, and do not represent or limit the scope of the present invention, protection scope of the present invention is as the criterion with claims.
Embodiment
Technical scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.
For better the present invention being described, be convenient to understand technical scheme of the present invention, typical but non-limiting embodiment of the present invention is as follows:
As depicted in figs. 1 and 2, a kind of experimental provision of the surfactant enhanced remediation process for simulating DNAPL pollutant in water-bearing zone, described device comprises two-dimensional visualization sandbox 1, the circulation system and surfactant adding apparatus 2.
Described two-dimensional visualization sandbox 1 upward opening, its transversely by band filter opening baffle for separating be the tank at two ends and the sand launder of centre; Described two-dimensional visualization sandbox 1 front is provided with timing image-taking device, and rear is arranged with transmitted light source in parallel; The inwall of described two-dimensional visualization sandbox 1 adopts frosting.
The described circulation system comprises activated-charcoal column 5, water tank 6 and is placed in pumped well simulative tube 3 and the inverted well simulative tube 4 of two-dimensional visualization sandbox 1 two ends tank respectively, described pumped well simulative tube 3 accesses the bottom of activated-charcoal column 5, the top of activated-charcoal column 5 is communicated with water tank 6, water tank 6 connects inverted well simulative tube 4 again, to form circulation path; The top layer of described activated-charcoal column 5 and bottom cover rubble, central filler cocoanut active charcoal.
Described surfactant adding apparatus 2 is connected in water tank 6, to add surfactant solution in water tank 6.
The first peristaltic pump 7 and T-valve 8 is provided with successively between bottom described pumped well simulative tube 3 and activated-charcoal column 5; The second peristaltic pump 9 is provided with between described water tank 6 and inverted well simulative tube 4.The 3rd peristaltic pump 10 is provided with between described surfactant adding apparatus 2 and water tank 6.Described pumped well simulative tube 3 and inverted well simulative tube 4 arrange the plexi-glass tubular of filter opening for bottom.
It is below the specific experiment method example by the surfactant enhanced remediation process of DNAPL pollutant in experimental provision simulation water-bearing zone of the present invention.Technological process as shown in Figure 3.
Two-dimensional visualization sandbox used is of a size of high 50cm, wide 80cm, thick 1cm.It is the water white transparency unorganic glass of thick 0.5cm before and after sandbox, for avoiding that wall effect occurs, inwall adopts frosting, and both sides and bottom are colourless transparent resin glass bar, seal with glass cement counter-lateral quadrents and bottom, upper opening is used for back-up sand and adds pollutant.Sandbox is transversely divided into 3 parts, the back-up sand of middle 60cm width by the organic glass bar of band filter opening, and both sides are the wide tank of each 10cm.For eliminating the interference of sandbox surface reflection light, test and carry out in dark surrounds, at sandbox rear, parallel placement lamp box is as light source, built-in 4 fluorescent tubes of lamp box, derives light to ensure uniform light with even tabula rasa.Digital camera (NikonD90) is positioned over 100cm place before sandbox, is connected on computer, utilizes the capture of Nikontrol3k software timing after setting exposure parameter.
Experiment selects translucent silica sand as porous medium, uses 0.05mol/LNaOH, 0.05mol/LHNO successively before filling
3, 5% hydrogen peroxide soaks 3h respectively, deionized water rinses rear natural air drying repeatedly.
Toward sandbox in, first inject the deionized water of certain altitude before experiment, under water-saturated state with funnel toward uniform filling silica sand in the wide sand launder of middle 60cm, often fill out 2cm and highly knock outer wall and make silica sand practicable.At 20cm on the right side of sandbox, centered by the 16cm eminence of bottom, the arc fine quartz layer of sand simulation aquitard that 1cm is thick is set, it injects the DNAPL pollutant that 5ml dyes with 80mg/L Sudan IV.Enter osmotic pressure due to what do not reach this aquitard particulate medium, pollutant is retained formation aggregation by aquitard.Filling silica sand is continued, until reach 36cm height after setting up contaminants body.
Use diameter 1cm in experiment, bottom 20cm is with the plexi-glass tubular of filter opening to insert in the tank of both sides and simulates pumped well and inverted well, utilizes peristaltic pump to simulate suction pump.Sebific duct one end of connection first peristaltic pump is inserted in the plexi-glass tubular of left side pumped well, the other end is connected to the bottom of activated-charcoal column, the water extracted out enters bottom activated-charcoal column, flows out, enter into water tank through sebific duct after activated-charcoal column adsorption treatment from top.Activated-charcoal column height 100cm, interior diameter 30cm, top layer and bottom cover rubble, central filler cocoanut active charcoal.Water is extracted out by the sebific duct that the second peristaltic pump connects from water tank, is circulated in inverted well, forms the circulation system.First peristaltic pump and the second peristaltic pump control in same traffic, make sandbox middle water level keep stable, and the height of water level controlled in the middle part of sandbox maintain 30cm.When needing to add surfactant in the system of drawing water, the amount of surfactant that needs per minute add is calculated according to the flowmeter of water in the circulation system, with the 3rd peristaltic pump, the surfactant solution prepared in advance is drawn in water tank, makes the concentration of surfactant solution in water tank keep constant.Between pumped well and activated-charcoal column, arrange T-valve, timing water sampling in experiment, by the concentration change of By Headspace Gas Chromatography DNAPL pollutant.
Experiment terminates the rear PhotoshopCS5 of utilization software and carries out sectional drawing to the digital image recorded in experimentation, removes experimental provision and other background information.After sectional drawing, picture resolution is 2423 × 887 pixels, and each pixel is about 0.2mm × 0.2mm, and intercepting picture actual size is 48.46cm × 17.74cm.Managing graph information completes in ImageJ software.ImageJ is an image processing software based on java, possesses multiple image procossing and analytic function, can carry out region and the pixels statistics of picture, be widely used.In ImageJ, arrange certain threshold value carry out information extraction to pollutant distribution scope, then carry out binaryzation, setting pigmented section is black, and remainder is white.Finally the measure instruction of ImageJ software is utilized to measure the area of black region, statistic record area value in units of pixel to the figure of binaryzation.
In water sample DNAPL concentration according to USEPA-8260C method at gas chromatograph-mass spectrometer (GCMS) (GC, USAAgilentTechnologies5973; MS, USAAgilentTechnologies5975) in measure.Gas chromatograph adopts DB-VRX capillary column (60m × 0.25mmID × 1.4 μm; AgilentTechnologies), with flow be the helium of 1.2ml/min as carrier gas, the maximum temperature of syringe and baking oven is set as 230 DEG C.Monitoring lower-cut is 0.05mg/L.
In the water sample obtained experimentally, DNAPL concentration change makes curve map, can assess this technique lower surface activating agent and strengthen the efficiency of repairing this kind of DNAPL pollutant in water-bearing zone.According to DNAPL Pollution Plume metamorphosis and the distribution area of image record, the risk of DNAPL diffusion mobility under this technique can be assessed.
Applicant states, the present invention illustrates detailed construction feature of the present invention and method by above-described embodiment, but the present invention is not limited to above-mentioned detailed construction feature and method, namely do not mean that the present invention must rely on above-mentioned detailed construction feature and method could be implemented.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the increase of accessory, the concrete way choice etc. of parts selected by the present invention, all drops within protection scope of the present invention and open scope.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (12)
1. one kind for simulating the experimental provision of the surfactant enhanced remediation process of DNAPL pollutant in water-bearing zone, it is characterized in that, described device comprises two-dimensional visualization sandbox (1), the circulation system and surfactant adding apparatus (2);
Described two-dimensional visualization sandbox (1) upward opening, its transversely by band filter opening baffle for separating be the tank at two ends and the sand launder of centre; Described two-dimensional visualization sandbox (1) front is provided with timing image-taking device;
The described circulation system comprises activated-charcoal column (5), water tank (6) and is placed in pumped well simulative tube (3) and the inverted well simulative tube (4) of two-dimensional visualization sandbox (1) two ends tank respectively, the bottom of described pumped well simulative tube (3) access activated-charcoal column (5), the top of activated-charcoal column (5) is communicated with water tank (6), water tank (6) connects inverted well simulative tube (4) again, to form circulation path;
Described surfactant adding apparatus (2) is connected in water tank (6), to add surfactant solution in water tank (6).
2. experimental provision as claimed in claim 1, is characterized in that, is provided with the first peristaltic pump (7) and T-valve (8) successively between described pumped well simulative tube (3) and activated-charcoal column (5) bottom; The second peristaltic pump (9) is provided with between described water tank (6) and inverted well simulative tube (4).
3. experimental provision as claimed in claim 1, is characterized in that, be provided with the 3rd peristaltic pump (10) between described surfactant adding apparatus (2) and water tank (6).
4. experimental provision as claimed in claim 1 or 2, is characterized in that, the inwall of described two-dimensional visualization sandbox (1) adopts frosting.
5. experimental provision as claimed in claim 1 or 2, it is characterized in that, described two-dimensional visualization sandbox (1) rear is arranged with transmitted light source in parallel.
6. the experimental provision as described in one of claim 1-3, is characterized in that, the top layer of described activated-charcoal column (5) and bottom cover rubble, central filler cocoanut active charcoal.
7. the experimental provision as described in one of claim 1-3, is characterized in that, described pumped well simulative tube (3) and inverted well simulative tube (4) are the plexi-glass tubular that bottom arranges filter opening.
8. utilize an experimental technique for the surfactant enhanced remediation process of DNAPL pollutant in experimental provision simulation water-bearing zone as described in one of claim 1-7, it is characterized in that, described experimental technique comprises the following steps:
1) to water filling in two-dimensional visualization sandbox (1);
2) under water-saturated state to uniform filling rubble sand in sand launder; In the filling process, fine quartz layer of sand is set to simulate aquitard, it injects dyed DNAPL pollutant, form aggregation; Continue to fill below rubble sand to the water surface;
3) drawn water to activated-charcoal column (5) from two-dimensional visualization sandbox (1) by pumped well simulative tube (3), flow in water tank (6) after adsorption treatment; Water in water tank (6) is poured in inverted well simulative tube (4), form circulation; Two-dimensional visualization sandbox (1) middle water level is made to keep stable in cyclic process;
4) calculate the amount adding surfactant solution in the unit interval in water tank (6) according to the flowmeter of water in the circulation system, make the concentration of surfactant solution in water tank (6) keep constant;
5) timing water sampling between pumped well simulative tube (3) and activated-charcoal column (5), the concentration change of analyzing DNA PL pollutant also makes curve map, and evaluation form surface-active agent strengthens the efficiency of repairing DNAPL pollutant in water-bearing zone;
6) digital image of record is analyzed; According to metamorphosis and the distribution area of DNAPL Pollution Plume, the risk of assessment DNAPL diffusion mobility.
9. experimental technique as claimed in claim 8, it is characterized in that, described experimental technique carries out in dark surrounds, opens transmitted light source, to make to inject two-dimensional visualization sandbox (1) uniform light everywhere after experiment starts.
10. experimental technique as claimed in claim 8 or 9, it is characterized in that, described rubble sand uses 0.05mol/LNaOH, 0.05mol/LHNO before filling successively
3, 5% hydrogen peroxide soaks 3h respectively, more repeatedly rinses rear natural air drying with deionized water.
11. experimental techniques as described in one of claim 8-9, it is characterized in that, described fine quartz layer of sand is arc convex downwards.
12. experimental techniques as described in one of claim 8-9, it is characterized in that, described DNAPL pollutant Sudan IV dyes.
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| CN114862835B (en) * | 2022-05-31 | 2023-04-07 | 中国地质大学（北京） | Method for quantifying quality of DNAPL source area in two-dimensional sand box |
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