CN108732068A - A method of simulation SOIL GAS invades device and its for room air TCA concentration evaluation - Google Patents
A method of simulation SOIL GAS invades device and its for room air TCA concentration evaluation Download PDFInfo
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- CN108732068A CN108732068A CN201810558804.1A CN201810558804A CN108732068A CN 108732068 A CN108732068 A CN 108732068A CN 201810558804 A CN201810558804 A CN 201810558804A CN 108732068 A CN108732068 A CN 108732068A
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Abstract
The present invention provides a kind of experimental provisions of simulation SOIL GAS invasion, including：First babinet, the second babinet and third babinet, the first babinet, the second babinet and third babinet include Interior Space gas-bearing formation, grade slab, migrating layer, pollution active layer, functional layer.The device can carry out experimental simulation verification to existing steam intrusion prediction model, and the environmental impact factor of each model is analyzed by experimental simulation method, inquires into the accuracy and applicability of each prediction model.
Description
Technical field
The invention belongs to field of environment risk evaluation, it is related to a kind of simulation SOIL GAS invasion device and its is used for room air
The method of trichloroethanes (TCA) concentration evaluation.
Background technology
Since volatile organic contaminant steam invasion modeling exists in existing contaminated site methods of risk assessment
Deficiency causes VOCs contaminated site evaluation results overly conservative, cannot embody actual place risk situation, VOCs is caused to pollute
That there are control expenses is excessively high for site remediation, repairs excessive phenomenon, leads to the space enrironment that cannot correctly solve the problems, such as China,
Be unfavorable for the sound development that China contaminated site repairs industry, therefore, diffusion mobility mechanism of the research VOCs in Pollution Field and
Steam invades the applicable elements of model, to further improving the existing contaminated site risk evaluation system in China and contaminated site pipe
Control and development and reuse have Great significance.
In existing contaminated site risk evaluation system, about the research that underground water and soil vapor are invaded, both at home and abroad specially
Family scholar establishes many Numerical models, such as J&E models, AAM models and Biovapor models, these numerical predictions
Model sets specific contaminated site condition to establish contaminated site conceptual model, is calculated and is predicted by Mathematical Modeling Methods
The risk size of the contaminated site, but the accuracy of the forecasting risk result of these numerical models needs further study tour.
In existing indoor air quality-monitoring and appraisal procedure, supervised with acquiring room air post analysis or placing
It surveys instrument to carry out based on monitoring in real time, such methods have certain limitation, are only capable of monitoring real-time indoor air pollutants dense
Degree cannot predict the indoor air quality condition of the plot future architecture object to assess current indoor air quality.
Invention content
Invaded the object of the present invention is to provide chloro hydrocarbon vapour in a kind of simulation soil and verify steam invasion model it is accurate
The experimental rig of row, structure setting is reasonable, can accurately simulate chloro hydrocarbon vapour in underground aeration zone
Diffusion mobility process.
The technical solution of the present invention is to provide a kind of experimental provisions of simulation SOIL GAS invasion, including：First babinet,
Two babinets and third babinet, the first babinet, the second babinet and third babinet include Interior Space gas-bearing formation, grade slab, migrating layer, dirt
Contaminate active layer, functional layer, it is characterised in that：
First babinet, the second babinet and third babinet are built by the transparent panel of glass material；First babinet, the second case
Body is identical with third babinet cross-sectional dimensions, and the first box height is 55cm, the second box height is 65cm and third babinet is high
Degree is 75cm；
Interior Space gas-bearing formation, to simulate the indoor environment of practical contaminated site, the first babinet, the second babinet and third babinet
Interior Space gas-bearing formation is 25cm, and a gap is wherein opened among one side wall, and hose connection is arranged in opposite side wall trepanning, using even
Take over connection air pump；
It is migrating layer below indoor environment layer, migrating layer fills out the clean pollution-free soil of paving, the first babinet, the second babinet and the
The migrating layer of three babinets is respectively 10cm, 20cm and 30cm, to the difference of simulating pollution Depth, one side wall setting inside and outside two
A hose connection, inside, which connects, buries pipe, and outside is taken in succession；
Active layer is polluted, pollution active layer fills out 1,1,1-TCA contaminated soil of paving, and contaminated soil is prepared and packing method is as follows：Claim
Clean pollution-free soil 440g is taken, uniformly fills out paving in the device, uniformly sprays 1,1,1-TCA medicine using solvent resistant corrosion watering can
Product in the first babinet, the second babinet and third babinet, arrange to spray 3g, 6g and 12g respectively according to experiment；
Sample tap A inner joints connect pipe laying, and external tapping connects connecting tube, for polluting 1,1,1-TCA steam sample of active layer
The acquisition of product, pollution active layer overall thickness are 10cm；
Functional layer, functional layer are made of clean pollution-free and recovery to room temperature soil, are compacted, functional layer simulates aeration zone
Clean soil below middle pollution sources；
The hard polyfluortetraethylene pipe that internal diameter is 2mm is buried in migrating layer and pollution active layer.
The invention additionally provides a kind of experimental provision progress room air TCA concentration evaluations using simulation SOIL GAS invasion
Method, specifically include：
Step 1, sampling are separately connected sample tap using hand-operating pressure pump and extract the first babinet, the second babinet and third
Each layer gaseous sample of babinet extracts fixing fabric structure in 10-50ml；Gaseous sample is sealed in aluminium foil gaseous sample band, and is positioned over 4
It is refrigerated in DEG C refrigerator, it is to be measured；
Before step 2, sample detection, analytical conditions for gas chromatography is set：Injector temperature is set as 220 DEG C；Column flow is set
It is set to 1.5mLmin-1；Post case temperature first with 35 DEG C holding 8min, after with 5 DEG C of min-1Rate be warming up to 100 DEG C, then with
10℃·min-1200 DEG C are warming up to, and keeps 5min；Detector temperature is set as 320 DEG C；Tail flow is set as 60mL
min-1；
Step 3, the standard TCA gases that a concentration of 2ppm, 20ppm, 50ppm, 100ppm, 200ppm is respectively configured use
The conditioned measurement being arranged in step 2, and draw graticule；
Step 4, sample test, using the GC conditions set in step 2 to the gaseous sample that is acquired in step 1
It measures；
The analysis of step 5, sample, according to step 4 measurement result, using the time as abscissa, a concentration of ordinates of TCA are made
Figure, obtains the TCA gas contents in each layer in different time device
The beneficial effects of the present invention are；This method can carry out experimental simulation to existing steam intrusion prediction model and test
Card, the environmental impact factor of each model is analyzed by experimental simulation method, inquires into the accuracy and applicability of each prediction model.
Description of the drawings
Fig. 1 is that the experiment dress that steam invades model is invaded and verified to 1,1,1-TCA steams in a kind of simulation soil of the present invention
Set three-dimensional structure diagram.
Fig. 2 is to simulate each layer TCA gas concentration result figures that steam phagocytic process is drawn with the first babinet；
Fig. 3 is to simulate each layer TCA gas concentration result figures that steam phagocytic process is drawn with the second babinet；
Fig. 4 is to simulate each layer TCA gas concentration result figures that steam phagocytic process is drawn with third babinet.
Specific implementation mode
To keep the goal of the invention, technical solution and advantage of the present invention clearer, walked below in conjunction with the accompanying drawings with specific implementation
It is rapid that the present invention is described in detail.
As shown in Figure 1, this embodiment offers a kind of experimental provisions of simulation SOIL GAS invasion, including：First babinet,
Two babinets and third babinet, the first babinet, the second babinet and third babinet include Interior Space gas-bearing formation, grade slab, migrating layer, dirt
Contaminate active layer, functional layer.
In the embodiment, the first babinet, the second babinet and third babinet are built by the transparent panel of glass material；Three
Babinet cross-sectional dimensions are 30cm × 40cm, and the first box height is 55cm, the second box height is 65cm and third babinet
Height is 75cm；
Interior Space gas-bearing formation, to simulate the indoor environment of practical contaminated site, the first babinet, the second babinet and third babinet
Interior Space gas-bearing formation is 25cm, and a gap 20cm × 0.2cm is opened among broadside side, and opposite side wall trepanning setting internal diameter is
The hose connection of 3mm connects air pump using connecting tube, facilitates sampling and manufacture indoor air-changing ventilation condition.
It is migrating layer below indoor environment layer, which fills out the clean pollution-free soil of paving, the first babinet, the second babinet and third
The migrating layer of babinet is respectively 10,20 and 30cm, and to the difference of simulating pollution Depth, inside and outside two hoses of side wall setting connect
Mouthful, inside, which connects, buries pipe, and outside is taken in succession.
One week 2mm protrusion is set among Interior Space gas-bearing formation and migrating layer, i.e., at top down 25cm inner walls, places ground
Plate, the ground plate thickness are 1.5cm, and length and width is respectively 29.8cm and 39.8cm, makes that there are one after being placed in protrusion
Fixed gap, with wall body slit around simulant building thing ground and ground, grade slab middle opening is arranged a diameter of 2.5mm's
Hose connection is taken in succession.
Active layer is polluted, pollution active layer fills out 1,1,1-TCA contaminated soil of paving, and contaminated soil is prepared and packing method is as follows：Claim
Clean pollution-free soil 440g is taken, uniformly fills out paving in the device, uniformly sprays 1,1,1-TCA medicine using solvent resistant corrosion watering can
Product in the first babinet, the second babinet and third babinet, arrange to spray 3g, 6g and 12g respectively according to experiment, to control the first case
It is 5 times, 10 times and 20 times screening value concentration that active layer simulating pollution source initial concentration is polluted in body, the second babinet and third babinet.
Sample tap A inner joints connect pipe laying, and external tapping connects connecting tube, for polluting 1,1,1-TCA steam sample of active layer
The acquisition of product, pollution active layer overall thickness are 10cm, compacting.
Functional layer, functional layer are mainly made of clean pollution-free and recovery to room temperature soil, are compacted, which simulates packet gas
Clean soil below pollution sources in band.
Pipe laying can be effectively prevent by the hard polyfluortetraethylene pipe that internal diameter is 2mm, the pipe in migrating layer and pollution active layer
It 1,1,1-TCA corrosion and will not be flattened by soil, it is empty that pipe laying every 1cm with pin pricks cruciate flower, to facilitate acquisition soil
Gaseous sample, one end are blocked with Capsule.
Air exchange condition setting：First babinet, the second babinet and third top of the box cover cover board, and hose connection D makes
It is persistently evacuated with connecting tube connection QS-1C types atmosphere sampling instrument, air exchange in simulating chamber, the device cavity total measurement (volume) is (30
× 40 × 25=) 30000mL, according to the room air exchange rate set in this experiment as 0.00014 s-1, setting sampling
The instrument speed of exhaust is 252mLmin-1。
Device ensures its air exchange conditional stability during running, and does not change at will, and system temperature is controlled at 20 DEG C.
In the embodiment, in order to monitor the diffusion process of pollutant in the first babinet, the second babinet and third babinet, also public affairs
The method for carrying out room air TCA concentration evaluations using the experimental provision has been opened, has been specifically included：
Step 1, sampling, are separately connected sample tap A, B, C and D using hand-operating pressure pump, extract the first babinet, second respectively
Babinet and each layer gaseous sample of third babinet extract fixing fabric structure in 10-50ml, and extraction speed is slow as possible, to prevent to dress
It sets interior gas and generated large disturbances；Gaseous sample is sealed in aluminium foil gaseous sample band, and is positioned in 4 DEG C of refrigerators and refrigerates, to be measured,
Theoretically storage time is no more than 24 hours.
Before step 2 sample detection, analytical conditions for gas chromatography should be set first：Injector temperature is set as 220 DEG C；Column stream
Amount is set as 1.5mLmin-1；Post case temperature first with 35 DEG C holding 8min, after with 5 DEG C of min-1Rate be warming up to 100 DEG C,
Again with 10 DEG C of min-1200 DEG C are warming up to, and keeps 5min；Detector temperature is set as 320 DEG C；Tail flow is set as
60mL·min-1；
Step 3 draws graticule, the standard TCA gases of a concentration of 2,20,50,100,200ppm is respectively configured, using step 2
In the conditioned measurement that sets, and draw graticule；
Step 4 sample test, using the GC conditions set in step 2 to the gaseous sample that is acquired in step 1
It measures；
The analysis of step 5 sample, according to step 4 measurement result, using the time as abscissa, a concentration of ordinate mappings of TCA,
Obtain the TCA gas contents in each layer in different time device.
Fig. 2-4 is respectively the TCA concentration maps drawn with the first babinet, the second babinet and third babinet and appraisal procedure.
Although the principle of the present invention is described in detail above in conjunction with the preferred embodiment of the present invention, this field skill
Art personnel are it should be understood that above-described embodiment is only the explanation to the exemplary implementation of the present invention, not to present invention packet
Restriction containing range.Details in embodiment is simultaneously not meant to limit the scope of the invention, without departing substantially from the present invention spirit and
In the case of range, any equivalent transformation, simple replacement based on technical solution of the present invention etc. obviously changes, and all falls within
Within the scope of the present invention.
Claims (5)
1. a kind of experimental provision of simulation SOIL GAS invasion, including：First babinet, the second babinet and third babinet, the first babinet,
Second babinet and third babinet include Interior Space gas-bearing formation, grade slab, migrating layer, pollution active layer, functional layer, it is characterised in that：
First babinet, the second babinet and third babinet are built by the transparent panel of glass material；First babinet, the second babinet and
Third babinet cross-sectional dimensions are identical, and the first box height is 55cm, the second box height is 65cm and third box height is
75cm；
Interior Space gas-bearing formation, to simulate the indoor environment of practical contaminated site, in the first babinet, the second babinet and third babinet room
Air layer is 25cm, and a gap is wherein opened among one side wall, and opposite side wall trepanning is arranged hose connection, uses connecting tube
Connect air pump；
It is migrating layer below indoor environment layer, migrating layer fills out the clean pollution-free soil of paving, the first babinet, the second babinet and third case
The migrating layer of body is respectively 10cm, 20cm and 30cm, and to the difference of simulating pollution Depth, inside and outside two of one side wall setting is soft
Interface tube, inside, which connects, buries pipe, and outside is taken in succession；
Active layer is polluted, pollution active layer fills out 1,1,1-TCA contaminated soil of paving, and contaminated soil is prepared and packing method is as follows：It weighs dry
Net pollution-free soil 440g, uniformly fills out paving in the device, uniformly sprays 1,1,1-TCA drug using solvent resistant corrosion watering can, the
In one babinet, the second babinet and third babinet, arranged to spray 3g, 6g and 12g respectively according to experiment；
Sample tap A inner joints connect pipe laying, and external tapping connects connecting tube, for polluting 1,1,1-TCA steam sample of active layer
Acquisition, pollution active layer overall thickness are 10cm；
Functional layer, functional layer are made of clean pollution-free and recovery to room temperature soil, are compacted, and functional layer is simulated dirty in aeration zone
Clean soil below dye source；
The hard polyfluortetraethylene pipe that internal diameter is 2mm is buried in migrating layer and pollution active layer.
2. a kind of experimental provision of simulation SOIL GAS invasion according to claim 1, it is characterised in that：Interior Space gas-bearing formation and
Among migrating layer, is i.e. one week 2mm protrusion is set at the first babinet, the downward 25cm inner walls of the second babinet and third top of the box, is put
Grade slab is set, ground plate thickness is 1.5cm, and there are certain gaps after grade slab is placed in protrusion, with simulant building thing
Wall body slit around base and ground, grade slab middle opening are arranged the hose connection of a diameter of 2.5mm, take in succession.
3. a kind of experimental provision of simulation SOIL GAS invasion according to claim 1, it is characterised in that：Air exchange condition
Setting：First babinet, the second babinet and third top of the box cover cover board, and hose connection D is big using connecting tube connection QS-1C types
Gas sampling instrument is persistently evacuated, air exchange in simulating chamber.
4. a kind of experimental provision of simulation SOIL GAS invasion according to claim 1, it is characterised in that：System temperature controls
At 20 DEG C.
5. carrying out the side of room air TCA concentration evaluations using the experimental provision that simulation SOIL GAS described in claim 1 is invaded
Method specifically includes：
Step 1, sampling are separately connected sample tap using hand-operating pressure pump and extract the first babinet, the second babinet and third babinet
Each layer gaseous sample extracts fixing fabric structure in 10-50ml；Gaseous sample is sealed in aluminium foil gaseous sample band, and is positioned over 4 DEG C of ice
It is refrigerated in case, it is to be measured；
Before step 2, sample detection, analytical conditions for gas chromatography is set：Injector temperature is set as 220 DEG C；Column flow is set as
1.5mL·min-1；Post case temperature first with 35 DEG C holding 8min, after with 5 DEG C of min-1Rate be warming up to 100 DEG C, then with 10
℃·min-1200 DEG C are warming up to, and keeps 5min；Detector temperature is set as 320 DEG C；Tail flow is set as 60mLmin-1；
Step 3, the standard TCA gases that a concentration of 2ppm, 20ppm, 50ppm, 100ppm, 200ppm is respectively configured, using step 2
The conditioned measurement of middle setting, and draw graticule；
Step 4, sample test carry out the gaseous sample acquired in step 1 using the GC conditions set in step 2
It measures；
The analysis of step 5, sample, according to step 4 measurement result, using the time as abscissa, a concentration of ordinate mappings of TCA obtain
TCA gas contents in different time device in each layer.
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Cited By (3)
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