CN110125156A - A kind of method of carbon dioxide filling technique processing heavy metal in soil pollution - Google Patents
A kind of method of carbon dioxide filling technique processing heavy metal in soil pollution Download PDFInfo
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- CN110125156A CN110125156A CN201810128992.4A CN201810128992A CN110125156A CN 110125156 A CN110125156 A CN 110125156A CN 201810128992 A CN201810128992 A CN 201810128992A CN 110125156 A CN110125156 A CN 110125156A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention discloses a kind of methods of carbon dioxide filling technique processing heavy metal in soil pollution, comprising: construction sand wick, earth's surface are laid with clay working cushion layer, casing is set, cutting depth groove is laid with plastic film, on a plastic film sleeve position aperture on working cushion layer top, carbon dioxide is passed through outer tube, it controls carbon dioxide flow and is passed through the time, stopping maintains the state for a period of time after being passed through, and opens vacuum system, vacuum degree and pumpdown time are controlled, and etc..After completing treatment process, heavy metal in soil can be reacted with arbon dioxide solution and be generated in the liquid that heavy metal ion is transferred in soil, and through vacuum extraction into processing discharge liquor, so as to effectively remove the heavy metal in soil, and eluent is not introduced newly, avoid the water containing heavy metal ion from moving downward polluted underground water.
Description
Technical field
The invention belongs to soil remediation technology fields, and in particular to a huge sum of money in a kind of carbon dioxide filling technique processing soil
Belong to the method for pollution.
Background technique
With a large amount of development and utilization of mineral resources, industrial fast development and various chemical products, pesticide and change
Fertilizer is widely used, and the pollutant containing heavy metal enters environment by all means, causes soil, especially an agricultural land soil huge sum of money
Belong to pollution to get worse.Currently, countries in the world soil, there are different degrees of pollution, Hg about 1.5 is discharged in the whole world every year on average
About 3,400,000 about 5,000,000 about 1 500 ten thousand t, Ni about 100t of t, Mn of t, Pb of × 104t, Cu.In Europe, by the farmland of heavy metal pollution
There are millions of hectares；Japan by the pollutions such as Cd, Cu, As farmland area be 7 224hm2.Current China by Cd, Hg, As,
Cultivated area about 2 000 × 104hm of Cr, Pb pollution2, the grain lost every year by heavy metal pollution about 1000 × 104t,
Contaminated grain up to 1 200 × 104t, economic loss are at least up to 200 × 108 yuan.
Currently, countries in the world mainly include physics, chemistry, biology, agricultural to farmland soil heavy metals pollution remediation technology
Ecology and combined remediation technology etc..
Peripheral doses technology
Peripheral doses technology mainly includes engineering measure (soil moved in improve the original, soil removal and replacement and deep ploughing are digged) and thermal desorption.Engineering measure tool
Have the advantages that thorough, stable, but project amount is big, investment is high, and destructible soil structures cause soil fertility to decline, to avoid two
Secondary pollution will also focus on contaminated soil.Therefore, it is only applicable to the reparation of the serious contaminated soil of small area；Heat is de-
Attached heated to contaminated soil, has volatile heavy metal if Hg, As, Se etc. in soil from desorbing for some
A kind of method, this method simple process, but energy consumption is high, and operating cost is high, and is only applicable to volatile pollutant, the gas of desorption
Body need to collect processing.
Chemical remediation technology
Chemical remediation technology includes electro reclamation, elution technique, stabilization/solidification recovery technique.
Electro reclamation is to form electric-force gradient, heavy metal in soil pollution by applying DC voltage in contaminated soil two sides
Object is brought to electrode both ends under electric field action by way of electromigration, electroosmotic flow or electrophoresis, then carries out at centralized collection
Reason, thus cleaning soil.Clay and silt soil of this method particularly suitable for hyposmosis, can control the flowing side of pollutant
To.Currently, Pool body design, electrokinetic process and its mechanism, in terms of carried out some exploration sex works.Electricity
Dynamic reparation is a kind of based technique for in-situ remediation, can remove removing heavy metals and organic pollutant simultaneously, not stir soil layer, is easy to operate, place
It manages high-efficient, is a kind of economically viable recovery technique, but easily lead to soil physico-chemical property variation.Electrokinetic remediation efficiency may be because
Soil surface particle is adsorbed to pollutant and electrode both ends H+(anode) and OH-(cathode) aggregation is influenced and is reduced.Since soda acid can
Cause soil physico-chemical property to change, adds such as chelating agent, complexing agent, surfactant and oxidation/reduction agent (H2O2、
NaMnO4、KMnO4、Fe0), it is allowed to form stable state and the soluble compound in pH wider range with heavy metal, passes through enhancing soil
Heavy metals mobilization achievees the purpose that efficiently to remove in earth.Research finds electric driving method removal effect is good and economic benefit height etc. is excellent
While point, there are still shortcomings, such as system acidification to lead to reverse osmosis flow phenomenon；Deposited phenomenon easily occurs in alkalinity band；Soil
In certain pollutants be difficult to parse.
Soil leaching technology is by water or the chelating agent (citric acid, EDTA, DTPA, EDDS) containing rinse aid, acid/base
Solution (H2SO4、HNO3), complexing agent (acetic acid, ammonium acetate, cyclodextrin), surfactant) (APG, SDS, SDBS, DDT, sandlwood
Glycolipid) etc. eluents be injected into contaminated soil or deposit, elution and cleaning pollutant in soil process.The pass of the technology
Key is to find one kind to extract the heavy metal of various forms and destroy the leacheate of soil texture.Studies have shown that
0.1mol·L-1For HCl as eluent, the removal rate to Cu, Ni, Pb, Zn is respectively 92%, 77%, 79%, 75%；Commonly
Artificial chelating agent, as ethylenediamine tetra-acetic acid (EDTA) is attained by ideal elution effect to Pb and Cd.A large amount of engineering practice tables
Bright, Soil leaching technology is a kind of fast and efficiently method.The poor soil remediation effect of weight viscous for geology, permeability
It is poor.Efficient eluent is expensive, and elution waste liquid may cause the secondary pollution of soil and groundwater.Currently, can scale
The Soil leaching technology and development of complete equipment of application relatively lag behind, it would be highly desirable to further increase and perfect.
Stabilization/curing soil recovery technique, which refers to, fixes noxious pollutant in soil with method physically or chemically
Come, or pollutant is converted to the inactive form of chemical property, prevents it from activities such as migrating, spread in the environment, to drop
The recovery technique of the murder by poisoning degree of low pollution substance.Common Curing Agents are divided into 4 classes: inorganic bond substance (such as cement, lime),
Organic binder (such as pitch thermoplastic material), thermmohardening organic polymer (such as urea, phenoplasts and epoxides),
Glassy substances.Chemistry is fixed mainly by the way that chemical agent or material is added, and is formed between heavy metal using it insoluble
Or poor mobility, small toxicity substance and reduce its biological effectiveness and migration in the soil.Existing a large amount of improvement material
Material, as Multimetal oxide, clay mineral, organic matter, macromolecule polymeric material, biomaterial are applied.The pass of the technology
Key is to find cheap and environmental-friendly modifying agent.Stabilization/curing soil recovery technique is in-situ immobilization, simple and easy,
But it is not a kind of permanent reclamation activities, because only changing the existing forms of heavy metal, heavy metal element is remained in soil,
It is easy reactivation and generates secondary pollution.
Bioremediation technology
It is biological prosthetic to refer to using specific bio-absorbable, conversion, removing or degradation environmental contaminants, realize that environment is net
Change, the biological control measure that ecological effect is restored, mainly includes phytoremediation, microorganism remediation and animal reparation.This method is because having
At low cost, easy to operate, without secondary pollution, high treating effect and the advantages that can be widely applied, mechanism study and is answered
It is concerned with prospect.
Phytovolatilization is to absorb metal using root system of plant, is translated into gaseous material and evaporate into atmosphere, to reduce
Soil pollution, but easily cause secondary pollution.Microorganism remediation is to heavy metal adsorption or to be converted into low toxicity using active microorganism
Product, to reduce heavy metal pollution degree.But microorganism individual is small, it is difficult to separate from soil, there is also existing with reparation
Field indigenous strain competition etc..Agro-ecology is repaired main include two aspect: one is to agronomy reclamation activities.Second is that restoration of the ecosystem.
The advantages that technology maturation, cost is relatively low, smaller to soil environment disturbance, but repairing efficiency is long, and effect is not significant.
Combined remediation technology
Studying more United Technologies at present includes bio combined technology, physical chemistry United Technologies and physical chemistry-life
Object United Technologies.The technology rests on the laboratory research stage more, and technological means is immature.
The above-mentioned prior art has the following disadvantages；
1, energy consumption is high, and operating cost is high
2, can scale application Soil leaching technology and development of complete equipment relatively lag behind
3, it is easy reactivation and generates secondary pollution
4, repairing efficiency is long, and effect is not significant
5, leacheate is unable to get organized flowing control, easily flows into groundwater environment, polluted underground water.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide in a kind of carbon dioxide filling technique processing soil
The method of heavy metal pollution, the processing heavy metal in soil pollution method can efficiently remove heavy metal in soil pollution and not
It introduces eluent and causes secondary pollution.
The present invention is achieved by the following technical solutions:
A kind of method of carbon dioxide filling technique processing heavy metal in soil pollution, contains using the soil water of the method
Amount should be not less than 28%, carry out in accordance with the following steps:
Step 1, in soil surface vertical construction sand wick to be processed, depth is described to raw soil layer mellow soil layer intersection
Well spacing is 1~3m between sand drain, and arrangement form is the arrangement of round or square symmetry between sand drain；
Step 2, earth's surface is laid with deep silty clay working cushion layer, and the working cushion layer is with a thickness of 5~10cm；
Step 3, casing is set in the sand drain, and described sleeve pipe lower end is located at the sand drain bottom, and described sleeve pipe includes
The working cushion layer is exposed in inner and outer tubes, described sleeve pipe upper end, and the outer tube passes through hose and carbon dioxide generating device phase
Even, said inner tube is connected by hose with vacuum system；
Step 4, in the groove that soil surrounding cutting depth to be processed is 30~50cm, plastics are laid on working cushion layer top
Film, and the plastic film surrounding is embedded in the groove, the described sleeve pipe position aperture on the plastic film makes institute
It states sleeve upper end and stretches out the plastic film, so far vacuum prepressing system construction is completed；
Step 5, the vacuum system is opened, checks the airtightness of the vacuum prepressing system；
Step 6, the carbon dioxide generating device is opened, and the carbon dioxide is passed through the outer tube, controls flow
Make 0.1~10cm of flow of carbon dioxide3/ min is passed through the control of carbon dioxide time in 30~200min, stops titanium dioxide
Carbon is passed through, and maintains 10~20h of the state；
Step 7, under the carbon dioxide entrance air-tight state of outer tube, the vacuum system is opened, controls absolute vacuum degree
For 3~80kPa, speed control is filtered in 2~5cm/s；
Step 8, after 30~90min being filtered by vacuum, the vacuum system is closed；
In above-mentioned technical proposal, the sand drain depth is 20~50cm, and sand drain diameter is in 5~20cm.
In above-mentioned technical proposal, the outer tube gos deep into mellow soil outer wall and is provided with venthole, distance between the venthole
For 1~5cm, the ventilation bore dia is 1~5mm.
In above-mentioned technical proposal, said inner tube caliber is 2~17cm, and the outer tube caliber is 5~20cm.
In above-mentioned technical proposal, described sleeve pipe uses PVC pipeline.
In above-mentioned technical proposal, the partial-length that the outer tube is wrapped up by the hose should be not less than 5cm, be wanted according to right
Method described in asking 1, which is characterized in that the partial-length that said inner tube is wrapped up by the hose should be not less than 5cm.
In above-mentioned technical proposal, the vacuum system includes vacuum pump and gas-liquid separation device.
In above-mentioned technical proposal, the carbon dioxide generating device is HT-1 type carbon-dioxide generator, and primary charging is solid
Body ammonium hydrogencarbonate stores sour bucket and dilute sulfuric acid is added, can produce carbon dioxide gas.
In above-mentioned technical proposal, vacuum system vacuum degree and pumpdown time are by drawing vacuum pressure-time change
Curve and ground settlement-time graph, the vacuum pressure and ground settlement of each depth of stratum, draw each stratum in observing earth ground
Vacuum pressure-the time changing curve and ground settlement-time changing curve of depth determines.
In above-mentioned technical proposal, processing heel row water outlet is collected in gas-liquid separation device.
The advantages and benefits of the present invention are:
The method of the present invention includes: to arrange casing in soil internal vertical to be processed, and be laid with Su Liao Bao Mo in soil surface,
System leak detection, carbon dioxide gas filling, liquid extraction and etc., carbon dioxide does not influence environment as a kind of gas fertilizer
And soil, entire method have the characteristics that validity, exploitativeness, high efficiency and eco-environmental prote.
CO2It is filled into after soil and is transferred in the soil water in the form of an ion with heavy metal carbonate synthesis hydrogen salt, heavy metal, then
Contaminant water is taken away using vacuum mode, so that heavy metal in soil be made to be handled, solves heavy metal in soil pollution problem.This
Method can effectively remove the heavy metal in soil, and not introduce eluent newly, and the water containing heavy metal ion is avoided to move downward
Polluted underground water.
In addition, outer tube is used to be combined into one as gas tube and inner tube as pumping conduit, plastic seal film seals soil,
It is isolated with atmospheric pressure, when being vacuumized using vaccum-pumping equipment, pressure is reduced rapidly, and the pore water pressure in soil is with inner tube
The reduction of middle pressure forms barometric gradient, and the water containing heavy metal ion is discharged by inner tube, using the side of vertical vacuum pumping pipe
Method eliminates the loss of horizontal sand bedding course, chimney filter and filter membrane to vacuum energy in vacuum pressure transmittance process, and vertically
Pressure drop very little improves the utilization efficiency of vacuum pressure.In addition, sharing a vertical duct；Both it had reduced cost of equipment or had reduced
Occupied area, wherein inner and outer tubes can also be recycled, and reduce processing cost.
In conclusion advantage of the present invention can efficiently handle the heavy metal element in soil, and will not be to surrounding
Environment and underground water cause secondary pollution.
Detailed description of the invention
Fig. 1 is the schematic diagram of the embodiment of the present invention one.
Fig. 2 is the cannula structure schematic diagram of the embodiment of the present invention one.
Wherein:
1: raw soil layer, 2: mellow soil layer, 3: working cushion layer, 4: plastic film, 5: outer tube, 6: inner tube, 7: carbon dioxide occurs
Device, 8: venthole, 9: hose, 10: gas-liquid separation device, 11: vacuum pump.
It for those of ordinary skill in the art, without creative efforts, can be according to above attached
Figure obtains other relevant drawings.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, combined with specific embodiments below furtherly
Bright technical solution of the present invention.
Embodiment one
Sampling soil sample content of beary metal is Pb:78mg/kg, Cd:0.2mg/kg, Cr:96mg/kg, Cu:60mg/kg, Zn:
1270mg/kg, soil moisture content 28%.
Step 1, in the planting soil ground of 3m*3m*0.4m, beating diameter is 7cm, and depth is the sand wick of 40cm, well spacing
For 1.3m, arrangement form is square distribution totally 9 between sand drain；
Step 2, earth's surface is laid with deep silty clay working cushion layer, and the working cushion layer is with a thickness of 5cm；
Step 3, casing is set in the sand drain, and described sleeve pipe lower end is located at the sand drain bottom, and described sleeve pipe includes
Inner and outer tubes, said inner tube caliber are 5cm, and the outer tube caliber is 7cm, and the working cushion layer is exposed in described sleeve pipe upper end
7cm, the outer tube are connected by hose with carbon dioxide generating device, and said inner tube is connected by hose with vacuum system, institute
Stating the partial-length that outer tube is wrapped up by the hose is 5cm, and the partial-length that said inner tube is wrapped up by the hose is 5cm, institute
It states outer tube embedment mellow soil part and makes a call to the hole that a diameter is 2mm every 1cm, using outer tube as gas tube, length is consistent with inner tube；
Step 4, in the groove that soil surrounding cutting depth to be processed is 30cm, it is thin that plastics are laid on working cushion layer top
Film, and the plastic film surrounding is embedded in the groove, the described sleeve pipe position aperture on the plastic film, make described
Sleeve upper end stretches out the plastic film, and so far vacuum prepressing system construction is completed；
Step 5, the vacuum system is opened, checks the airtightness of the vacuum prepressing system；
Step 6, with HT-1 type carbon-dioxide generator, the primary solid carbonic acid hydrogen ammonia 0.85kg that charges, the sour bucket of storage is added dilute
Sulfuric acid 0.85kg can produce carbon dioxide gas 0.37kg, and the carbon dioxide be passed through the outer tube, and control flow makes two
The flow of carbonoxide is 0.1cm3/ min is passed through the control of carbon dioxide time and stops carbon dioxide in 80min and be passed through, and maintains
State 12h；
Step 7, under the carbon dioxide entrance air-tight state of outer tube, the vacuum system is opened, controls absolute vacuum degree
For 3.5kPa；
Step 8, after 40min being filtered by vacuum, the vacuum system is closed；
Collect the water of discharge.Sample detection soil content of beary metal.Through in detection soil, lead removal rate reaches 96%, chromium
Removal rate reaches 96%, and copper removal rate reaches 94%, and zinc removal rate reaches 97%, and cadmium removal rate reaches 93%.
Water quality in raw soil layer is sampled, does not detect heavy metal bicarbonate.
Embodiment two
Sampling soil sample content of beary metal is Pb:86mg/kg, Cd:0.1mg/kg, Cr:86mg/kg, Cu:60mg/kg, Zn:
1600mg/kg, soil moisture content 31%.
Step 1, in the planting soil ground of 8m*8m*0.5m, beating diameter is 10cm, and depth is the sand wick of 50cm, well spacing
For 1.5m, arrangement form is square distribution totally 16 between sand drain；
Step 2, earth's surface is laid with deep silty clay working cushion layer, and the working cushion layer is with a thickness of 7cm；
Step 3, casing is set in the sand drain, and described sleeve pipe lower end is located at the sand drain bottom, and described sleeve pipe includes
Inner and outer tubes, said inner tube caliber are 5cm, and the outer tube caliber is 7cm, and the working cushion layer is exposed in described sleeve pipe upper end
7cm, the outer tube are connected by hose with carbon dioxide generating device, and said inner tube is connected by hose with vacuum system, institute
Stating the partial-length that outer tube is wrapped up by the hose is 5cm, and the partial-length that said inner tube is wrapped up by the hose is 5cm, institute
It states outer tube embedment mellow soil part and makes a call to the hole that a diameter is 2mm every 1cm, using outer tube as gas tube, length is consistent with inner tube；
Step 4, in the groove that soil surrounding cutting depth to be processed is 40cm, it is thin that plastics are laid on working cushion layer top
Film, and the plastic film surrounding is embedded in the groove, the described sleeve pipe position aperture on the plastic film, make described
Sleeve upper end stretches out the plastic film, and so far vacuum prepressing system construction is completed；
Step 5, the vacuum system is opened, checks the airtightness of the vacuum prepressing system；
Step 6, with HT-1 type carbon-dioxide generator, the primary solid carbonic acid hydrogen ammonia 8kg that charges, the sour bucket addition dilute sulfuric acid of storage
8kg can produce carbon dioxide gas 3.4kg, and the carbon dioxide be passed through the outer tube, and control flow makes carbon dioxide
Flow is 0.2cm3/ min, being passed through the carbon dioxide time is 100min, stops carbon dioxide and is passed through, and maintains state 16h；
Step 7, under the carbon dioxide entrance air-tight state of outer tube, the vacuum system is opened, controls absolute vacuum degree
For 15kPa；
Step 8, after 80min being filtered by vacuum, the vacuum system is closed；
Collect the water of discharge.Sample detection soil content of beary metal.Through in detection soil, lead removal rate reaches 92%, chromium
Removal rate reaches 89%, and copper removal rate reaches 90%, and zinc removal rate reaches 95%, and cadmium removal rate reaches 88%.
Water quality in raw soil layer is sampled, does not detect heavy metal bicarbonate.
Embodiment three
Sampling soil sample content of beary metal is Pb:85mg/kg, Cd:0.15mg/kg, Cr:95mg/kg, Cu:60mg/kg, Zn:
1270mg/kg, soil moisture content 29%
Step 1, in the planting soil ground of 3m*3m*0.4m, beating diameter is 7cm, and depth is the sand wick of 50cm, well spacing
For 1.3m, arrangement form is square distribution totally 9 between sand drain；
Step 2, earth's surface is laid with deep silty clay working cushion layer, and the working cushion layer is with a thickness of 5cm；
Step 3, casing is set in the sand drain, and described sleeve pipe lower end is located at the sand drain bottom, and described sleeve pipe includes
Inner and outer tubes, said inner tube caliber are 5cm, and the outer tube caliber is 7cm, and the working cushion layer is exposed in described sleeve pipe upper end
7cm, the outer tube are connected by hose with carbon dioxide generating device, and said inner tube is connected by hose with vacuum system, institute
Stating the partial-length that outer tube is wrapped up by the hose is 5cm, and the partial-length that said inner tube is wrapped up by the hose is 5cm, institute
It states outer tube embedment mellow soil part and makes a call to the hole that a diameter is 2mm every 1.5cm, using outer tube as gas tube, length is consistent with inner tube；
Step 4, in the groove that soil surrounding cutting depth to be processed is 50cm, it is thin that plastics are laid on working cushion layer top
Film, and the plastic film surrounding is embedded in the groove, the described sleeve pipe position aperture on the plastic film, make described
Sleeve upper end stretches out the plastic film, and so far vacuum prepressing system construction is completed；
Step 5, the vacuum system is opened, checks the airtightness of the vacuum prepressing system；
Step 6, with HT-1 type carbon-dioxide generator, the primary solid carbonic acid hydrogen ammonia 0.85kg that charges, the sour bucket of storage is added dilute
Sulfuric acid 0.85kg can produce carbon dioxide gas 0.37kg, and the carbon dioxide be passed through the outer tube, and control flow makes two
The flow of carbonoxide is 0.15cm3/ min, being passed through the carbon dioxide time is 90min, stops carbon dioxide and is passed through, and maintains the shape
State 16h；
Step 7, under the carbon dioxide entrance air-tight state of outer tube, the vacuum system is opened, controls absolute vacuum degree
For 3.5kPa；
Step 8, after 40min being filtered by vacuum, the vacuum system is closed；
Collect the water of discharge.Sample detection soil content of beary metal.Through in detection soil, lead removal rate reaches 95%, chromium
Removal rate reaches 96%, and copper removal rate reaches 95%, and zinc removal rate reaches 98%, and cadmium removal rate reaches 93%.
Water quality in raw soil layer is sampled, does not detect heavy metal bicarbonate.
Illustrative description has been done to the present invention above, it should explanation, the case where not departing from core of the invention
Under, any simple deformation, modification or other skilled in the art can not spend the equivalent replacement of creative work equal
Fall into protection scope of the present invention.
Claims (10)
1. a kind of method of carbon dioxide filling technique processing heavy metal in soil pollution, carries out in accordance with the following steps:
Step 1, in soil surface vertical construction sand wick to be processed, depth to raw soil layer mellow soil layer intersection, the sand drain
Between well spacing be 1~3m, arrangement form is the arrangement of round or square symmetry between sand drain；
Step 2, earth's surface is laid with deep silty clay working cushion layer, and the working cushion layer is with a thickness of 5~10cm；
Step 3, casing is set in the sand drain, and described sleeve pipe lower end is located at the sand drain bottom, and described sleeve pipe includes inner tube
And the working cushion layer is exposed in outer tube, described sleeve pipe upper end, the outer tube is connected by hose with carbon dioxide generating device, institute
Inner tube is stated to be connected by hose with vacuum system；
Step 4, in the groove that soil surrounding cutting depth to be processed is 30~50cm, it is thin that plastics are laid on working cushion layer top
Film, and the plastic film surrounding is embedded in the groove, the described sleeve pipe position aperture on the plastic film, make described
Sleeve upper end stretches out the plastic film, and so far vacuum prepressing system construction is completed；
Step 5, the vacuum system is opened, checks the airtightness of the vacuum prepressing system；
Step 6, the carbon dioxide generating device is opened, and the carbon dioxide is passed through the outer tube, control flow makes two
The flow of carbonoxide is 0.1~10cm3/ min is passed through the control of carbon dioxide time in 30~200min, it is logical to stop carbon dioxide
Enter, maintains 10~20h of the state；
Step 7, under the carbon dioxide entrance air-tight state of outer tube, the vacuum system is opened, control absolute vacuum degree is 3~
80kPa filters speed control in 2~5cm/s；
Step 8, after 30~90min being filtered by vacuum, the vacuum system is closed.
2. the method according to claim 1, wherein the sand drain depth is 20~50cm, sand drain diameter 5~
20cm。
3. the method according to claim 1, wherein the outer tube, which gos deep into mellow soil outer wall, is provided with venthole,
Distance is 1~5cm between the venthole, and the ventilation bore dia is 1~5mm.
4. the outer tube caliber is the method according to claim 1, wherein said inner tube caliber is 2~17cm
5~20cm.
5. the method according to claim 1, wherein described sleeve pipe uses PVC pipeline.
6. the method according to claim 1, wherein the partial-length that the outer tube is wrapped up by the hose should not
Less than 5cm, the method according to claim 1, wherein said inner tube is answered by the partial-length that the hose wraps up
Not less than 5cm.
7. the method according to claim 1, wherein the vacuum system includes vacuum pump and gas-liquid separation dress
It sets.
8. the method according to claim 1, wherein the carbon dioxide generating device is HT-1 type carbon dioxide
Generator, the primary solid carbonic acid hydrogen ammonia that charges store sour bucket and dilute sulfuric acid are added, can produce carbon dioxide gas.
9. the method according to claim 1, wherein vacuum system vacuum degree and pumpdown time are to pass through drafting
Vacuum pressure-time changing curve and ground settlement-time graph, the vacuum pressure and ground of each depth of stratum in observing earth ground
Table sedimentation, draws vacuum pressure-time changing curve and the ground settlement-time changing curve of each depth of stratum to determine.
10. the method according to claim 1, wherein collecting processing heel row water outlet in gas-liquid separation device.
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| CN114888063A (en) * | 2022-06-07 | 2022-08-12 | 江苏省环境科学研究院 | In-situ remediation method for contaminated soil around buried sewage pipeline |
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