CN110426477A - The simulator of Zero-valent Iron hydrodynamic seepage pressure - Google Patents
The simulator of Zero-valent Iron hydrodynamic seepage pressure Download PDFInfo
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- CN110426477A CN110426477A CN201910758933.XA CN201910758933A CN110426477A CN 110426477 A CN110426477 A CN 110426477A CN 201910758933 A CN201910758933 A CN 201910758933A CN 110426477 A CN110426477 A CN 110426477A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
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- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/06—Preparation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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- G01N30/04—Preparation or injection of sample to be analysed
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Abstract
The present invention relates to field of underground water pollution repair, and in particular to a kind of simulator of Zero-valent Iron hydrodynamic seepage pressure.The technical issues of aiming to solve the problem that the reaction process for how effectively monitoring Zero-valent Iron hydrodynamic seepage pressure, simulator provided by the invention includes: water supply mechanism, for configuring underground aqueous solution；Reaction column is fixed on bracket vertically, and weighing unit is provided below in bracket；Zero-valent Iron medium is filled in reaction column, bottom end is provided with the first water inlet, and top is provided with the first water outlet；First water inlet connects water supply mechanism, and the first water outlet is separately connected gas collector and waste liquid bottle.Based on above structure of the invention, the course of work of hydrodynamic seepage pressure can be simulated, and the yield of hydrogen and sediment in Zero-valent Iron reaction process is effectively monitored and precise measurement, facilitate technical staff to predict the performance of Zero-valent Iron hydrodynamic seepage pressure, provides data supporting for designer to improve the design of Zero-valent Iron hydrodynamic seepage pressure.
Description
Technical field
The present invention relates to field of underground water pollution repair, in particular to a kind of simulation of Zero-valent Iron hydrodynamic seepage pressure
Device.
Background technique
In face of the underground water pollution got worse, hydrodynamic seepage pressure (Permeable Reactive Barrier, PRB)
It is widely studied and applied in underground water pollution reparation as a kind of technology in situ, simple, passive.Wherein, Zero-valent Iron is permeated
Reacting grid is one of the technology being most widely used at present, can be by reacting the electronation, absorption of medium in grid, sinking
The effects of forming sediment, be complexed and being co-precipitated realizes a variety of organic and inorganic pollution removal.So far, it is had more than in the whole world
200 Zero-valent Iron hydrodynamic seepage pressures build up and are used to study, and achieve good groundwater remediation effect.
Although having a large amount of Engineering Projects, the influence of remediation efficiency reduction in Zero-valent Iron hydrodynamic seepage pressure operational process
Factor is clear not yet, specifically includes: (1) when zeroth order iron rot generates Zero-valent Iron inactivation caused by sediment covers and hydraulic retention
Between reduce；(2) it is blocked caused by the secondary minerals such as calcium carbonate precipitating；(3) it is stifled to generate gas caused by hydrogen accumulation for zeroth order iron rot.
Therefore, the generation process for how effectively monitoring Zero-valent Iron precipitating mineral and hydrogen in reaction column generates hydrogen to iron rot is disclosed
Gas and mineral precipitation are to Zero-valent Iron reactivity and infiltrative Influencing Mechanism, and to improving Zero-valent Iron hydrodynamic seepage pressure
Design effectively and simulation and forecast are of great significance.
Currently, domestic and international researcher generallys use the reaction column of filling Zero-valent Iron and simulates Zero-valent Iron infiltration by column experiments
The operational process of grid is reacted, for example, carrying out indirect assessment Zero-valent Iron by analyzing in Zero-valent Iron reaction column different location water sampling
Reaction process.But calculated value is only to represent the anti-of Zero-valent Iron in entire reaction column using the variation of liquid phase component in column
Answer activity change.In addition to this, by gravimetry, the mass change for measuring reaction column can accurately measure reaction cylinder
The total mass change of various substances in being.However, in reaction process iron rot generate hydrogen except part with dissolve mutually exist in addition to,
There are also parts mutually to exist with non-dissolution, and hydrogen partial bubble is trapped in column between medium hole and occupies certain volume, when
When hydrogen gas bubbles in hole are left and occupied again by solution, reaction column quality also be will increase.Therefore, only pass through quality monitoring
The increase that can not determine reaction column quality is caused by precipitating generation or hydrogen release.To sum up, there are no energy in the prior art
The simulator of enough precise measurement Zero-valent Iron hydrodynamic seepage pressure hydrogen producing amount and precipitation capacity.
Summary of the invention
The purpose of the present invention is to provide a kind of simulators of Zero-valent Iron hydrodynamic seepage pressure, can simulate Zero-valent Iron
The course of work of hydrodynamic seepage pressure realizes precise measurement using the device and calculates the production hydrogen of Zero-valent Iron hydrodynamic seepage pressure
Tolerance and precipitation capacity.
To achieve the goals above, the present invention provides a kind of simulator of Zero-valent Iron hydrodynamic seepage pressure, the dresses
It sets and includes:
Water supply mechanism, for configuring underground aqueous solution；
Reaction column is fixed on bracket vertically, and weighing unit is provided below in the bracket；It is loaded in the reaction column
There is Zero-valent Iron medium, bottom end is provided with the first water inlet, and top is provided with the first water outlet；First water inlet connects institute
Water supply mechanism is stated, first water outlet is separately connected gas collector and waste liquid bottle.
Further, the water-supply structure includes water feeding tank, nitrogen cylinder, water quality monitor and peristaltic pump；
The water feeding tank, top are provided with sealing cover, and bottom is connected with the second water outlet with valve；On the sealing cover
It is provided with the liquid-feeding tube with valve, described liquid-feeding tube one end is protruded into inside the water feeding tank, and the other end connects extraneous resource of water supply；
Second water outlet connects first water inlet by the peristaltic pump；
The nitrogen cylinder connects the water feeding tank by the air inlet pipe with air valve, and one end of the air inlet pipe is run through
The sealing cover simultaneously extends to the bottom in the water feeding tank；
The water quality monitor, including at least one water quality monitoring probe, the water quality monitoring probe run through the sealing
It covers and extends in the water feeding tank.
Further, the water quality monitor includes pH value monitoring probe, dissolved oxygen monitoring probe, oxidation-reduction potential prison
One of probing head, monitored conductivity probe, temperature monitoring probe and water level monitoring probe are a variety of.
Further, multiple solid phase sample taps and liquid phase sampler are evenly arranged on the cylinder of the reaction column；
The solid phase sample tap is closed with the internal screw thread and matched bolt of the solid phase sample tap, in institute
It states and is additionally provided with gasket on bolt；
The liquid phase sampler, including sampling head, extension tube and vacuum sampling tube；The sampling head is laid in described anti-
On the center line of Ying Zhu, the vacuum sampling tube is connected by the extension tube, the vacuum sampling tube is arranged in the reaction
Outside column.
Further, the reaction column is prepared using clear polycarbonate pipe, and height is 200mm~250mm, directly
Diameter 30mm~50mm, outer surface are marked with graduation mark or point, and cylinder wall thickness is less than or equal to 2mm, and bottom is horizontal end face, top
For hemispheric top cover；
The solid phase sample tap quantity is 4, respectively apart from described horizontal end face 40mm, 80mm, 120mm, 160mm；
The liquid phase sampler quantity is 4, respectively apart from described horizontal end face 40mm, 80mm, 120mm, 160mm；
Wherein, the solid phase sample tap and the liquid phase sampler are separately positioned on the reaction column opposite sides.
Further, the reaction column further includes the first pressure-measuring pipe and the second pressure-measuring pipe, and first pressure-measuring pipe connects institute
The first water inlet is stated, second pressure-measuring pipe connects first water outlet.
Further, the range length value of first pressure-measuring pipe is greater than the height value of the reaction column.
Further, first pressure-measuring pipe and second pressure-measuring pipe are glass pressure tube meter,
The range of first pressure-measuring pipe is 400mm~600mm, and the second pressure-measuring pipe range is 100mm~150mm；
Second pressure-measuring pipe, the gas collector, waste liquid bottle series connection, and second pressure-measuring pipe is located at institute
After stating gas collector, before the waste liquid bottle.
Further, the gas collector is cylindrical, the top close to its inner cavity is provided with gas-permeable membrane, in institute
It states and is provided with headspace sampling mouth on gas-permeable membrane.
The present invention has the advantages that
The simulator of Zero-valent Iron hydrodynamic seepage pressure provided by the invention, can simulate the worked of hydrodynamic seepage pressure
Journey, and the yield of hydrogen and sediment in Zero-valent Iron reaction process is effectively monitored and precise measurement, facilitate technology people
Member predicts the performance of Zero-valent Iron hydrodynamic seepage pressure, furthermore provides data supporting improvement Zero-valent Iron infiltration for designer
React the design of grid.
Detailed description of the invention
Fig. 1 is the primary structure schematic diagram of the simulator of Zero-valent Iron hydrodynamic seepage pressure of the invention.
Specific embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little embodiments are used only for explaining technical principle of the invention, it is not intended that limit the scope of the invention.
Refering to attached drawing 1, Fig. 1 illustrates the primary structure of the simulator of Zero-valent Iron hydrodynamic seepage pressure, such as Fig. 1
Shown, the simulator of Zero-valent Iron hydrodynamic seepage pressure provided by the invention includes:
Water supply mechanism, for configuring underground aqueous solution；The water-supply structure include water feeding tank 1, nitrogen cylinder 7, water quality monitor 8 with
And peristaltic pump 10；Water feeding tank 1, top are provided with sealing cover 2, and bottom is connected with band the second water outlet of valve 9；It is set on sealing cover 2
It is equipped with the liquid-feeding tube 4 with valve, 4 one end of liquid-feeding tube is protruded into inside water feeding tank 1, and the other end connects extraneous resource of water supply；Second goes out
The mouth of a river 9 connects the first water inlet 21 by peristaltic pump 10；Nitrogen cylinder 7 connects water feeding tank 1 by the air inlet pipe 3 with air valve, and
One end of air inlet pipe 3 is through sealing cover 2 and extends to the bottom in water feeding tank 1；Water quality monitor 8, including at least one water quality
Monitoring probe 5, water quality monitoring probe 5 is through sealing cover 2 and extends in water feeding tank 1, and water quality monitor 8 may include pH value prison
Probing head, dissolved oxygen monitoring probe, oxidation-reduction potential monitoring probe, monitored conductivity probe, temperature monitoring probe and water level
One of monitoring probe is a variety of.In the present embodiment, the long 200mm of 1 size of water feeding tank, width 100mm, high 200mm.
Reaction column 11 is fixed on vertically on bracket 12, and bracket 12 is provided below weighing unit 13, in the present embodiment,
Weighing unit 13 is the electronic scale of position very much, and range is not less than 5kg；Zero-valent Iron medium is filled in reaction column 11, bottom end is set
It is equipped with the first water inlet 21, top is provided with the first water outlet 6；First water inlet 21 connects water supply mechanism, and the first water outlet 6 divides
It Lian Jie not gas collector 22 and waste liquid bottle 24.Multiple solid phase sample taps 16 and liquid phase are evenly arranged on the cylinder of reaction column 11
Sampler；Solid phase sample tap 16 is provided with internal screw thread, cooperates with bolt and closes the solid phase sample tap, is additionally provided on bolt close
Packing.Liquid phase sampler includes sampling head 17, extension tube 18 and vacuum sampling tube 19；Sampling head 17 is arranged in reaction column
On heart line, vacuum sampling tube 19 is connected by extension tube 18, vacuum sampling tube 19 is arranged outside reaction column 11.The sampling head 17
For more empty hydrophilic ceramic materials, extension tube 18 is with reinforcing wire vinyl tube, and vacuum sampling tube 19 is with Shandong
The vacuum tube of your connector.Pass through sealant adhesive seal between the liquid phase sampler and reaction column 11.Gas collector 22 is in circle
Cylindricality is provided with gas-permeable membrane 25 on the top close to its inner cavity, headspace sampling mouth 26 is provided on gas-permeable membrane.
In the present embodiment, reaction column 11 is using having the polycarbonate pipe of the high grade of transparency and light transmittance to be prepared, with full
Sufficient x-ray fluorescence and the test of micro x-ray tomography (MicroCT) in-situ characterization, the height of reaction column 11 be 200mm~
250mm, diameter 30mm~50mm, outer surface are marked with graduation mark or point 27, and cylinder wall thickness is less than or equal to 2mm, and bottom is water
Planar end surface 14, the first water inlet 21 connect on the horizontal end face 14, and top is hemispheric top cover 15, the connection of the first water outlet 6
On the top cover 15, external screw thread is equipped on the horizontal end face 14 and top cover 15, and be spirally connected with the sealing of the screw-internal thread fit of cylinder；Gu
16 quantity of phase sample tap is 4, respectively apart from horizontal end face 40mm, 80mm, 120mm, 160mm；Liquid phase sampler quantity is 4
It is a, respectively apart from horizontal end face 40mm, 80mm, 120mm, 160mm；Wherein, solid phase sample tap 16 and liquid phase sampler are set respectively
It sets in 11 opposite sides of reaction column.
In addition, reaction column 11 further includes the first pressure-measuring pipe 20 and the second pressure-measuring pipe 23, the first pressure-measuring pipe 20 connection first into
The mouth of a river 21, the second pressure-measuring pipe 23 connect the first water outlet 6.The range length value of first pressure-measuring pipe 20 is greater than the height of reaction column 11
Value.In the present embodiment, the first pressure-measuring pipe 20 and the second pressure-measuring pipe 23 are glass pressure tube meter, band range scale, the first pressure-measuring pipe
20 range is 400mm~600mm, and 23 range of the second pressure-measuring pipe is 100mm~150mm.Second pressure-measuring pipe 23, gas collector
22, waste liquid bottle 24 is connected by catheter 21, and the second pressure-measuring pipe 23 is located at after gas collector 22, waste liquid bottle 24 it
Before.
Using the method for the simulator of above-mentioned Zero-valent Iron hydrodynamic seepage pressure, may include steps of:
Step S1: the underground aqueous solution of simulation water chemistry condition needed for being configured based on water supply device.Specifically, using being furnished with
The solution of simulation Hydro-chemical component, is passed through nitrogen to water feeding tank by air inlet pipe needed for the liquid-feeding tube of control valve is added into water feeding tank
Gas drive removes oxygen, liquid phase oxidation reducing environment needed for realizing configuration body of groundwater, and obtains water quality ginseng by water quality monitor
Number information, configured underground aqueous solution is sealed.
Step S2: the Zero-valent Iron medium of simulation hydrodynamic seepage pressure is loaded in reaction column, sequentially embedment liquid phase takes for layering
The sampling head and extension tube of sample device, and seal liquid phase sample tap, solid phase sample tap and reaction column.
Step S3: reaction column is vertically fixed on bracket, and bracket is placed on an electronic balance.
Step S4: sequentially by catheter by water supply mechanism, peristaltic pump, the first pressure-measuring pipe, reaction column, gas collector,
Second pressure-measuring pipe and waste liquid bottle are connected to.
Step S5: each valve is opened, and using peristaltic pump as conveying machinery, configured underground aqueous solution is continued
It is sent into reaction column.
Step S6: after underground aqueous solution reacts setting time with Zero-valent Iron medium, the generated mine of Zero-valent Iron medium is obtained
The element of object forms and its relative amount；Element composition and its relative amount based on Zero-valent Iron medium, it is corresponding to obtain reaction column
Sediment production quantity.
Specifically, it can be the core based on Synchrotron Radiation X-Ray Fluorescence probe (μ-SXRF) scanning reaction column, obtain anti-
The scanning figure of the Synchrotron Radiation X-Ray Fluorescence probe technique of Zero-valent Iron medium in Ying Zhu；Based on synchrotron radiation zone X ray detecting fluorescence
The corresponding two-dimensional pixel distribution map of probe technique (μ-SXRF) scanning figure obtains the element composition of Zero-valent Iron medium；Based on two-dimensional image
Plain distribution map and the constituent content that Zero-valent Iron medium is obtained by method shown in formula (1).
Ci=a × Hi+b (1)
Wherein, CiThe content of the element i of mineral, H are generated by Zero-valent Iron mediumiIt is corresponding for element i in two-dimensional distribution
Image pixel intensities, a, b are respectively preset coefficient.In the present embodiment, a, b are to measure the corresponding content graticule of element according to μ-SXRF
And it sets.
The corresponding sediment production quantity of reaction column is obtained by method shown in formula (2):
mp=∑i(Ci-Ci0) (2)
Wherein, mpFor the corresponding sediment production quantity of reaction column, Ci0For the initial content of element i in Zero-valent Iron medium.
Step S7: the mass change value of reaction column and the interior hydrogen volume collected of gas collector in setting time are obtained；
Based on sediment production quantity, mass change value and hydrogen volume, the corresponding hydrogen generating quantity of reaction column is obtained.
Specifically, the corresponding hydrogen generating quantity of reaction column is obtained by method shown in formula (3):
Wherein, VgFor the corresponding hydrogen generating quantity of reaction column, VcFor the hydrogen volume of dissolution phase non-in reaction column, VbFor gas
The hydrogen volume collected in body collector, VdFor the hydrogen volume for dissolving phase in reaction column, Δ m is the mass change of reaction column
Value, mpFor the corresponding sediment production quantity of reaction column, ρwFor the density of underground aqueous solution.
The hydrogen volume V of dissolution phase in reaction columndAs shown in formula (4):
Vd=c × (h2-h1) (4)
Wherein, c indicates solubility of the hydrogen in the aqueous solution of underground, h2Indicate the corresponding inflow of reaction column, h1For reaction
The corresponding water yield of column.In the present embodiment, solubility c be every 100g water in dissolve 0.00016g (20 DEG C, a normal atmosphere
Pressure).
Further, in this embodiment by being utilized respectively synchrotron radiation zone X ray detecting fluorescent probe technique (μ-SXRF)
With the core of x ray absorption near edge structure spectrum (μ-XANES) sweep test reaction column, obtain in reaction column at different loading positions
The element of Zero-valent Iron medium forms and its relative amount, determines mineral precipitation type generated.And it is obtained according to different moments
Reaction column in medium image pixel two-dimensional pixel distribution map, by same cell pixel region sample different time rank
The Multiple-Scan of section obtains the image pixel intensities for specifying Mineral pairs to answer element in corresponding time chart, and mineral pixel corresponding in figure is strong
The relative amount of degree and mineral element carries out correlation analysis, and the linear relationship of the content and image pixel intensities that determine different minerals is public
Formula acquires the element composition and its relative amount of Zero-valent Iron medium.
Further, synchrotron radiation zone X ray detecting fluorescent probe technique and x ray absorption near edge structure compose debugging process:
Carry out preliminary experiment first to be corrected instrument, determines the range and step-length of scanning, spectral intensity, which is adjusted, makes itself and picture
The constituent content given in element is proportional, establishes test graticule.Due to needing to exclude influence of the reaction column to test, also to acquire
Initial synchronisation radiates zone X ray detecting fluorescent probe technique data and x ray absorption near edge structure modal data, carries out revising background
And standardization, establish base line condition.The identification of elemental characteristic peak and spectral line disturbance ecology in sample are carried out, finally to draw a circle to approve medium
In the suitable region of interest of each element.
Further, it is acquired about data, is to monitor that sample, micro-computer controlled three-dimensional sample are mobile by optical microscopy
Platform is scanned X-ray to specified region.Record reaction column position coordinates (are marked according to cylinder central axes before scanning every time
The calibration points that note is accurate to millimeter determine point), so that traversing of probe picture position is consistent.Whole sweep is carried out when scanning first
It retouches, carries out carefully adopting spectrum in the higher point of constituent content, and carry out single-spot testing analysis to individual high-content regions.Meanwhile it is logical
The Multiple-Scan to same pixel region sample is crossed, the image information of differential responses period is obtained.
Further, data interpretation includes: 1) elemental characteristic peak fitting: carrying out fluorescence data spectrum unscrambling with PyMca software, intends
It closes, calculates the net spectral peak area of each element analytical line.2) synchrotron radiation zone X ray detecting fluorescent probe technique scan element two-dimensional image
Plain distribution map: the Mapping figure and fluorescence data therein obtained is handled with Igor software.3) element correlation: soft with Excel
Part is by the Mapping map intensity (H of each elementi) and constituent content progress correlation analysis, establish mathematical formulae.4) X-ray
It absorbs the absorption line processing of near edge structure spectrum: carrying out spectral line drafting, comparison and standardization with Athena software, it is soft with Athena
Linear combination data in part carries out the fitting of sample absorption line.Fitting effect is carried out by R-factor
Assessment, R-factor is smaller, and error of fitting is smaller.
Further, data analysis and verifying: by synchrotron radiation zone X ray detecting fluorescent probe technique scan image picture
The analysis of element can directly observe the content and distributed intelligence of different elements in reaction column.X ray absorption near edge structure spectrum provides
The oxidation state of metal, ligancy and geometric configuration, the x ray absorption near edge structure by comparing sample and standard specimen compose spectrogram, can
With mineral shape existing for clear corresponding element ((hydrogen) oxide, carbonate etc.).In addition, due to synchrotron radiation zone X ray detecting
Fluorescence intensity relationship proportional to the content of element in fluorescent probe technique scan image, can be analyzed by the statistics of fluorescence intensity
Constituent content variation converts content/pore volume information for point of interest fluorescence intensity/sweep time information, obtains reaction column
The reaction rate of different parts element.Simultaneously by the Multiple-Scan to same pixel region sample, can obtain a certain region with
The variation of time response rate.Although solid-liquid is alternate it also occur that reaction, is swept due to every in reaction column during the test
Tracing acquisition time interval is fixed, to keep the deviation of the content caused by time lag in test relatively fixed.
Further, the present invention also provides a kind of method of simulator using above-mentioned Zero-valent Iron hydrodynamic seepage pressure,
It includes the following steps:
A, the underground aqueous solution of simulation water chemistry condition, is added by liquid-feeding tube first needed for being prepared by the water supply mechanism
The obtained aqueous solution of simulation Hydrochemical Composition, is then passed through nitrogen flooding oxygen by connecting the air inlet pipe of nitrogen cylinder, and lead to needed for entering
It crosses water quality monitoring probe and water quality monitor obtains water quality parameter information, the underground of simulation water chemistry condition needed for preparing is water-soluble
Liquid is sealed；
B, reaction column top cover is unscrewed, keeps vertical, several times pours into zero-valent iron particle in column by funnel, and touch
Column tube, rodding, while loadings are recorded, and be layered the sampling head and extension tube of embedment liquid phase sampler, sealing liquid phase takes
Sample mouth, solid phase sample tap and reaction column.
C, reaction column is closely perpendicularly fixed on bracket, support level is placed on electronic balance.
D, water supply mechanism, peristaltic pump, the first pressure-measuring pipe, reaction column, gas-collecting pipe, the second pressure-measuring pipe and waste liquid bottle are led to
Cross liquid guide pipeline connection.
E, each component valve is opened, using peristaltic pump as conveying machinery, it is fixed that the groundwater simulation liquid of preparation is continued
Flow is input in reaction column.
F, by electronic balance weighing variation observation, the acquisition of gas-collecting pipe hydrogen and liquid phase in reaction column operational process
Sampler water sampling, and it is close to reaction column progress in-situ synchronization radiation zone X ray detecting fluorescent probe technique and X-ray absorption
Side structure spectrum sweep test passes through solid phase sample tap Zero-valent Iron collecting test, hydrogen in assay reaction process after reaction
Gas and precipitating yield influence Zero-valent Iron hydrodynamic seepage pressure.
Further, the step f is successively recorded the following steps are included: in reaction column operational process in synchronization
Scale weight, first and second piezometric head value, and gas in gas collector is acquired, finally by liquid-phase collection
Device acquires water sample.Wherein, gas collection process is to be connected using leakproofness syringe into headspace sampling mouth to extract gas, then with matching
There is its hydrogen content of the gas chromatograph for determination of thermal conductivity detector (TCD)；Synchrotron radiation zone X ray detecting fluorescent probe technique and X-ray are inhaled
Receipts near edge structure spectrum original position corresponds to scale along reaction column central axes and is successively scanned test record；Liquid-phase collection device acquires water sample
To be acquired using vacuum tube automatic negative-pressure, acquires access new vacuum tube again every time.It after the completion of reaction, will be in reaction column
Water discharge, opens solid phase sample tap, successively takes out Zero-valent Iron medium from different location using hollow sampler, sealing is put into anaerobism
Case saves, to carry out mineral and carbonate content test in next step.
Reaction column total pore size volume can load parameter according to reaction column and calculate acquisition, the mineral species and water inlet solution of generation
Component is related, studies reaction column using synchrotron radiation zone X ray detecting fluorescent probe technique and x ray absorption near edge structure spectral technology
Constituent content, form and changes in distribution (selective analysis elemental iron, calcium and magnesium) in middle Zero-valent Iron；In combination with Micro CT technology
Different minerals are deposited in the distribution pattern between granular iron surface and pellet pores in in-situ study reaction column.Final clearly different water
Ingredient, type, pattern and the distribution of mineral are generated under electrochemical conditions in Zero-valent Iron.Different Zero-valent Iron corrosion products and calcium, magnesium
Hydroxide and carbonate mineral volume are calculated referring to table 1, and hydrogen volume is calculated according to collecting test in gas-collecting pipe.
The solid phase mineral and property detected in 1 Zero-valent Iron hydrodynamic seepage pressure of table
To sum up, the simulator of Zero-valent Iron hydrodynamic seepage pressure provided by the invention, can also simulate hydrodynamic seepage pressure
The course of work, and the yield of hydrogen and sediment in Zero-valent Iron reaction process is effectively monitored and precise measurement, side
Just technical staff predicts the performance of Zero-valent Iron hydrodynamic seepage pressure, furthermore provides data supporting improvement zero for designer
The design effectively of valence iron hydrodynamic seepage pressure.
Further, reaction column of the present invention uses the polycarbonate pipe production with the high grade of transparency and light transmittance, can be effective
Applied to x-ray fluorescence sweep test, accurate test result, the process that evaluation precipitating mineral generate are obtained.
Further, reaction column top cover of the present invention is semicircle, and gas can be effectively prevent in the horizontal top product of reaction column
It is poly- to be difficult to move.
Further, reaction column inflow and outflow mouth of the present invention is separately connected the first pressure-measuring pipe and the second pressure-measuring pipe, can essence
Really test iron rot generates the variation of hydrogen and precipitation process to reaction column infiltration coefficient.
Further, the present invention using the effectively fixed reaction column of bracket and is placed on high Accuracy Electronic Balance, can be accurate
Test generates the variation of hydrogen and precipitation process to reaction column quality.
Further, gas collector cavity of the present invention top is equipped with gas-permeable membrane, can effectively realize the separation of aqueous vapor.
Further, the present invention can be to the monitoring of the head in Zero-valent Iron hydrodynamic seepage pressure operational process, solid-liquid-gas phase
Sampling, characterization test analysis and quality volume EQUILIBRIUM CALCULATION FOR PROCESS, quantitative analysis iron rot generate hydrogen and secondary mineral precipitating to zero
Valence iron hydrodynamic seepage pressure reactivity and infiltrative influence improve the authenticity and accuracy of simulated experiment, are zeroth order
The design effectively of iron hydrodynamic seepage pressure and performance prediction provide theory support.
The above is presently preferred embodiments of the present invention and its technical principle used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any equivalent change based on the basis of technical solution of the present invention
Change, simple replacement etc. is obvious changes, all fall within the protection scope of the present invention.
Claims (9)
1. a kind of simulator of Zero-valent Iron hydrodynamic seepage pressure, which is characterized in that described device includes:
Water supply mechanism, for configuring underground aqueous solution；
Reaction column is fixed on bracket vertically, and weighing unit is provided below in the bracket；Zero is filled in the reaction column
Valence iron medium, bottom end are provided with the first water inlet, and top is provided with the first water outlet；First water inlet connects the confession
Water dispenser structure, first water outlet are separately connected gas collector and waste liquid bottle.
2. the simulator of Zero-valent Iron hydrodynamic seepage pressure as described in claim 1, which is characterized in that the water-supply structure packet
Include water feeding tank, nitrogen cylinder, water quality monitor and peristaltic pump；
The water feeding tank, top are provided with sealing cover, and bottom is connected with the second water outlet with valve；It is arranged on the sealing cover
There is the liquid-feeding tube with valve, described liquid-feeding tube one end is protruded into inside the water feeding tank, and the other end connects extraneous resource of water supply；It is described
Second water outlet connects first water inlet by the peristaltic pump；
The nitrogen cylinder connects the water feeding tank by the air inlet pipe with air valve, and one end of the air inlet pipe is through described
Sealing cover simultaneously extends to the bottom in the water feeding tank；
The water quality monitor, including at least one water quality monitoring probe, the water quality monitoring probe run through the sealing cover simultaneously
It extends in the water feeding tank.
3. the simulator of Zero-valent Iron hydrodynamic seepage pressure as claimed in claim 2, which is characterized in that the water quality monitor
Including pH value monitoring probe, dissolved oxygen monitoring probe, oxidation-reduction potential monitoring probe, monitored conductivity probe, temperature monitoring
One of probe and water level monitoring probe are a variety of.
4. the simulator of Zero-valent Iron hydrodynamic seepage pressure as described in claim 1, which is characterized in that the column of the reaction column
Multiple solid phase sample taps and liquid phase sampler are evenly arranged on body；
The solid phase sample tap is closed with the internal screw thread and matched bolt of the solid phase sample tap, in the spiral shell
Gasket is additionally provided on bolt；
The liquid phase sampler, including sampling head, extension tube and vacuum sampling tube；The sampling head is laid in the reaction column
Center line on, the vacuum sampling tube is connected by the extension tube, the vacuum sampling tube is arranged outside the reaction column
Portion.
5. the simulator of Zero-valent Iron hydrodynamic seepage pressure as claimed in claim 4, which is characterized in that
The reaction column is prepared using clear polycarbonate pipe, and height is 200mm~250mm, diameter 30mm~50mm,
Outer surface is marked with graduation mark or point, and cylinder wall thickness is less than or equal to 2mm, and bottom is horizontal end face, and top is hemispheric top
Lid；
The solid phase sample tap quantity is 4, respectively apart from described horizontal end face 40mm, 80mm, 120mm, 160mm；
The liquid phase sampler quantity is 4, respectively apart from described horizontal end face 40mm, 80mm, 120mm, 160mm；
Wherein, the solid phase sample tap and the liquid phase sampler are separately positioned on the reaction column opposite sides.
6. the simulator of Zero-valent Iron hydrodynamic seepage pressure as described in claim 1, which is characterized in that the reaction column also wraps
The first pressure-measuring pipe and the second pressure-measuring pipe are included, first pressure-measuring pipe connects first water inlet, the second pressure-measuring pipe connection
First water outlet.
7. the simulator of Zero-valent Iron hydrodynamic seepage pressure as claimed in claim 6, which is characterized in that first pressure-measuring pipe
Range length value be greater than the reaction column height value.
8. the simulator of Zero-valent Iron hydrodynamic seepage pressure as claimed in claim 6, which is characterized in that first pressure-measuring pipe
It is glass pressure tube meter with second pressure-measuring pipe,
The range of first pressure-measuring pipe is 400mm~600mm, and the second pressure-measuring pipe range is 100mm~150mm；
Second pressure-measuring pipe, the gas collector, waste liquid bottle series connection, and second pressure-measuring pipe is located at the gas
After body collector, before the waste liquid bottle.
9. the simulator of Zero-valent Iron hydrodynamic seepage pressure as described in claim 1, which is characterized in that the gas collector
It is cylindrical, the top close to its inner cavity is provided with gas-permeable membrane, headspace sampling mouth is provided on the gas-permeable membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910758933.XA CN110426477A (en) | 2019-08-16 | 2019-08-16 | The simulator of Zero-valent Iron hydrodynamic seepage pressure |
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| CN201910758933.XA CN110426477A (en) | 2019-08-16 | 2019-08-16 | The simulator of Zero-valent Iron hydrodynamic seepage pressure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112028214A (en) * | 2020-09-02 | 2020-12-04 | 生态环境部环境规划院 | Chemical for synchronously removing chromium and cadmium composite pollution in underground water and preparation method thereof |
| CN113845234A (en) * | 2021-09-23 | 2021-12-28 | 中国环境科学研究院 | Sand column device for simulating oxidation-reduction zone of underground water and using method |
| CN114441389A (en) * | 2022-02-14 | 2022-05-06 | 郑州大学 | Dynamic pressure-bearing device for simulating PRB medium reaction process in deep groundwater |
-
2019
- 2019-08-16 CN CN201910758933.XA patent/CN110426477A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112028214A (en) * | 2020-09-02 | 2020-12-04 | 生态环境部环境规划院 | Chemical for synchronously removing chromium and cadmium composite pollution in underground water and preparation method thereof |
| CN113845234A (en) * | 2021-09-23 | 2021-12-28 | 中国环境科学研究院 | Sand column device for simulating oxidation-reduction zone of underground water and using method |
| CN114441389A (en) * | 2022-02-14 | 2022-05-06 | 郑州大学 | Dynamic pressure-bearing device for simulating PRB medium reaction process in deep groundwater |
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