CN111515237A - Soil remediation device and method - Google Patents
Soil remediation device and method Download PDFInfo
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- CN111515237A CN111515237A CN202010323704.8A CN202010323704A CN111515237A CN 111515237 A CN111515237 A CN 111515237A CN 202010323704 A CN202010323704 A CN 202010323704A CN 111515237 A CN111515237 A CN 111515237A
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- 239000002689 soil Substances 0.000 title claims abstract description 60
- 238000005067 remediation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 123
- 230000008439 repair process Effects 0.000 claims abstract description 43
- 238000000605 extraction Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000002912 waste gas Substances 0.000 claims abstract description 12
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- 239000011241 protective layer Substances 0.000 claims description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 238000011065 in-situ storage Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000003900 soil pollution Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 238000011835 investigation Methods 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000003673 groundwater Substances 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 claims description 2
- 239000000356 contaminant Substances 0.000 claims 1
- 239000003344 environmental pollutant Substances 0.000 abstract description 13
- 231100000719 pollutant Toxicity 0.000 abstract description 13
- 238000009792 diffusion process Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 5
- 238000003911 water pollution Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000003502 gasoline Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002283 diesel fuel Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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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
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/062—Reclamation of contaminated soil thermally by using electrode or resistance heating elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a soil remediation device and a method, wherein the device comprises a volatile gas capture device, a gas extraction device and a waste gas treatment device; the volatile gas catching device is composed of a plurality of transverse repair pipes; the method comprises the steps of investigating pollution condition; forming a repair protection layer; digging a vertical downward longitudinal side well on the inner side of a gas station site far away from a traffic road; arranging transverse well points, and transversely building a well to a pollution source area of a gas station site by taking a side well as a starting point of drilling; and starting the heating resistance rod and the gas extraction device, and collecting the volatile organic pollutants in the transverse repair pipe. The method can realize the restoration of the soil below the ground, enhance the thermal conductivity of the soil, quickly restore the underground water, and simultaneously cut off the peripheral diffusion of pollutants on the premise of ensuring the normal use of the ground gas station on the ground, thereby improving the overall restoration effect of the gas station.
Description
Technical Field
The invention relates to the technical field of remediation engineering, in particular to a soil remediation device and method.
Background
With the implementation of national environmental protection policies, almost all major and middle cities in China face the problem of closing and moving of a large number of enterprises which are emphatically polluting industries, so that a large number of left and abandoned sites appear in the cities, and if a considerable number of sites are directly developed without being repaired, a large number of environmental problems are caused. The national soil pollution survey data that environmental protection department released show, national soil environment situation is totally optimistic, and partial area soil pollution is heavier, and arable soil environmental quality is anxious, and industrial and mining wasteland soil environmental problem is outstanding, and a large amount of filling station places are waited to restore urgently. In order to thoroughly solve the problems, the state and related ministries continue to provide a plurality of policies, laws and standards about soil and underground water remediation, so that technical and capital support is provided for the site remediation industry, and meanwhile, the further development of the soil and underground water remediation industry is promoted.
Wherein, the gas station site is the pollution site with the largest quantity all over the world, and nearly 10 ten thousand gas stations are shared in China. The water pollution prevention action plan proposes to update a double-layer tank for the underground oil tank of the gas station or complete the arrangement of an impermeable pool aiming at preventing the underground water pollution, and the national underground water pollution prevention plan (2011 plus 2020) also takes the gas station as an important working object for preventing the underground water pollution.
The main application of the gas station is to supply fuel oil such as diesel oil, gasoline and the like to social vehicles, and in the long-term use process, oil leakage can be formed due to improper maintenance or material aging and the like, so that the oil can permeate adjacent underground soil and underground water. The characteristics of the gasoline station site are different from the conventional pollution site. Firstly, the pollution type is mainly organic pollutants, and TPH is taken as the main pollution type; secondly, the pollution range has the characteristics of small area concentration and large area dispersion. After oil substances are leaked, the oil substances mainly exist in a liquid phase and a gas phase, and threaten the health of human bodies through ways of volatilization, contact and the like.
According to urban planning, the location of gas stations is typically at the traffic jam, or major street in a city, and is therefore not suitable for large-scale destructive repair. The patent application publication No. CN104959373A discloses a repair system method for multiphase extraction of the soil and underground water heat reinforcement of a gas station, which realizes heat reinforcement through the design of a well pipe and simultaneously assists biological ventilation, and a heating system of the repair system is heated in the extraction process and is simultaneously controlled by a monitoring system and the like. The method aims to realize the aim of repairing soil and underground water by using a plurality of methods together, but the method builds the repairing device from the ground based on the premise that the gas station is abandoned, or the repairing of the gas station influences the normal business of the gas station, obviously, the point is inconsistent with the actual requirement.
Therefore, there is a need for a remediation device and method that is specific to the underground soil and underground water of a gas station and does not affect the normal utilization of the surface layer of the site.
Disclosure of Invention
The invention provides a soil remediation device and a method, in particular to an in-situ remediation device and a method for underground soil and underground water in a gas station field.
The specific technical scheme is as follows:
a soil remediation device for in situ remediation of underground soil and groundwater of a gas station site, comprising: the volatile gas capturing device, the gas extraction device and the waste gas treatment device are sequentially communicated;
the volatile gas capturing device is composed of a plurality of transverse repairing pipes which are transversely arranged at the underground soil pollution source, and each transverse repairing pipe is communicated with the gas extraction device;
the transverse repair pipe is of an inner-layer tubular structure and an outer-layer tubular structure, one end of the transverse repair pipe is an opening end, the other end of the transverse repair pipe is a sealing end, and a detachable sealing cover is sleeved on the sealing end; the open end extends into a pollution source area; the inner layer pipe body of the transverse repair pipe is provided with a vent hole, and a gas collection channel is formed between the inner layer and the outer layer; the sealing cover is provided with an air outlet communicated with the air collecting channel; the sealing cover is also provided with a heating resistance rod;
the air outlet is also communicated with the gas extraction device through a pipeline.
The above-mentioned prosthetic devices are more special structures in the volatile gas trapping apparatus, namely: the device is provided with a plurality of transverse repairing pipes instead of longitudinal repairing pipes, and is provided with the heating resistance rods, so that volatilization of organic pollutants around soil can be promoted through heating, and volatile gas can be captured. The number and the length of the transverse repair pipes are determined according to the actual situation of the site.
Furthermore, the gas extraction device consists of a gas collecting pipe, an extraction pump and a connecting pipe which are sequentially communicated; the waste gas treatment device consists of an activated carbon adsorber, a secondary adsorber, a draught fan and an exhaust pipe which are sequentially communicated; the gas collecting pipe is communicated with the gas outlet hole, and the connecting pipe is communicated with the activated carbon absorber. The device can effectively realize the extraction and treatment of gas. The gas extraction device can be provided with a plurality of gas collecting pipes corresponding to one transverse repair pipe, and can also be provided with a single gas pipe corresponding to a single transverse repair pipe.
Further, the soil remediation device further comprises a gas detection device; the gas detection device comprises a gas detector and a temperature detector, and the outlet of the exhaust pipe is 5cm away; in the repairing process, real-time data is collected through a monitor, and then the repairing condition is analyzed.
Preferably, the inner-layer pipe diameter of the transverse repairing pipe is 30-60 cm, and the outer-layer pipe diameter of the transverse repairing pipe is 35-65 cm. Tests show that the transverse repairing pipe with the pipe diameter has the highest efficiency of capturing volatile gas and is most effective.
Preferably, the vent holes are round holes and are distributed in a quincuncial pile shape; the sealing cover is provided with a plurality of air outlet holes which are of an annular structure; the volatile gas can be conveniently and rapidly conveyed into the gas extraction device.
The invention also provides a method for repairing underground soil and underground water of a gas station site by using the soil repairing device, which comprises the following steps:
(1) investigating the pollution condition of underground soil and underground water of a gas station site to be repaired;
(2) performing point injection of calcium sulfate from the ground surface of the gas station site downwards, and forming a repair protective layer after maintenance;
(3) after the maintenance of the repairing protective layer is finished, digging a vertical downward longitudinal side well on the inner side of a gas station site far away from a traffic road;
(4) according to the investigation result of the step (1), carrying out layout of transverse well points, and carrying out transverse well construction on a pollution source area of a gas station site by taking a side well as a starting point of drilling; installing a volatile gas capture device, a gas extraction device and a waste gas treatment device in the in-situ repair device;
inserting a transverse repairing pipe which is not sleeved with a sealing cover into underground soil of a gas station site at different depths in a direction vertical to the inner wall of the side well, and extending into an underground pollution source area of the gas station site; inserting a heating resistance rod into soil on the inner layer of the transverse repairing pipe, and installing a sealing cover;
(5) and starting the heating resistance rod, the gas extraction device and the waste gas treatment device, and collecting the volatile organic pollutants in the transverse repair pipe.
According to the invention, the repairing protective layer is arranged on the gas station site, the side well is dug and the transverse well is built, so that the use site for normal operation of the gas station site is avoided, the volatile pollutants below the ground of the gas station site are effectively collected and treated through the design of the transverse repairing pipe with a special structure, the repairing of the soil below the ground can be realized on the premise of ensuring the normal use of the gas station on the ground of the site, the thermal conductivity of the soil is enhanced, the underground water is rapidly repaired, the peripheral diffusion of the pollutants is cut off, and the overall repairing effect of the gas station is further improved.
The gas extraction device and the waste gas treatment device are arranged in the side well.
Further, in the step (1), the soil physicochemical property, the pollutant type and the site pollution source area distribution condition of the site are investigated.
Preferably, in the step (2), the depth of the repair protection layer is 15-25 cm.
Further, in the step (3), the layout of the transverse well points includes the number, positions and depths of the well points.
Need to investigate the restoration place, investigate the relevant geological parameter in place, specifically include: the physicochemical property of the field soil, the type of the pollutant, the distribution of the field pollution area and the like. Judging the types and the pollution degrees of pollutants in the field according to the geological parameters, and dividing areas with different pollution degrees; and then carrying out the layout of the well points according to the current situation of the site and the data investigation and analysis conditions, including the number, the positions and the depths of the well points. The number of well points and the distance between the well points can be properly increased for the area with serious pollution, and the number of the well points and the distance between the well points can be reduced and increased for the area with light pollution. The field comprises soil and underground water.
Preferably, in the step (3), the depth of the side well is 2-4 m, the length of the side well is 3-6 m, and the width of the side well is 1.5-3 m; the installation of the in-situ repair device is convenient.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the repairing protective layer is arranged on the gas station site, the side well is dug and the transverse well is built, so that the use site for normal operation of the gas station site is avoided, the volatile pollutants below the ground of the gas station site are effectively collected and treated through the design of the transverse repairing pipe with a special structure, the repairing of the soil below the ground can be realized on the premise of ensuring the normal use of the gas station on the ground of the site, the thermal conductivity of the soil is enhanced, the underground soil and the underground water are rapidly repaired, the peripheral diffusion of the pollutants is cut off, and the integral repairing effect of the gas station is further improved.
(2) The invention enlarges the application range by side well construction, does not influence the basic performance of the above-ground buildings, and does not influence the normal work of the oil tanks and the like.
(3) According to the invention, the power supply is used for enhancing the volatilization of soil organic matters, the remediation efficiency is accelerated, and the diffusion and migration of pollutants are promoted, so that the remediation effect of soil is improved.
(4) The method has low construction cost and simple operation, and can be widely applied to underground polluted soil in the coverage range of gas stations and inherent buildings with similar properties.
Drawings
Fig. 1 is a schematic structural view of a soil remediation device arranged in underground soil according to embodiment 1 and application example 1 of the present invention;
wherein, 1, a volatile gas catching device; 2. a gas extraction device; 3. an exhaust gas treatment device; 4. repairing the protective layer; 5. surface soil; 6. a longitudinal lateral well; 11. transversely repairing the tube; 111. transversely repairing the open end of the tube; 112. Repairing the sealed end of the tube transversely; 113. a sealing cover; 114. laterally repairing the inner layer of the tube; 115. laterally repairing the outer layer of the tube; 116. a vent hole; 117. a gas collection channel; 118. an air outlet; 119. a power source; 21. a gas collecting pipe; 22. An extraction pump; 23. a connecting pipe; 31. an activated carbon adsorber; 32. a secondary adsorber; 33. an induced draft fan; 34. and (4) exhausting the gas.
Fig. 2 is a partially enlarged view of the transverse repair tube shown in fig. 1, which is a front view of the transverse repair tube.
Detailed Description
The present invention will be further described with reference to the following specific examples, which are only illustrative of the present invention, but the scope of the present invention is not limited thereto.
Example 1
As shown in fig. 1 and 2, a soil remediation device, namely, an in-situ remediation device for underground soil and underground water in a gas station site, is inserted into the underground soil, and consists of a volatile gas capture device 1, a gas extraction device 2 and a waste gas treatment device 3 which are sequentially communicated;
the volatile gas capture device 1 is composed of a plurality of transverse repair pipes 11 which are transversely arranged at an underground soil pollution source, and each transverse repair pipe is communicated with the gas extraction device 2; the transverse repair tube 11 is of an inner-layer tubular structure and an outer-layer tubular structure, one end of the transverse repair tube is an opening end 111, the other end of the transverse repair tube is a sealing end 112, and a detachable sealing cover 113 is sleeved on the sealing end 112; the sealed end 112 is positioned in the side well, and the open end 111 extends into the pollution source area; the inner layer 114 of the transverse repair pipe 11 is provided with vent holes 116 which are round holes and are arranged in a quincuncial pile shape; the pipe diameter of the inner layer 114 of the transverse repairing pipe is 30cm, and the pipe diameter of the outer layer 115 is 40 cm; a gas collecting channel 117 is formed between the inner layer 114 and the outer layer 115; the sealing cover 113 is provided with a plurality of air outlet holes 118 communicated with the gas extraction device 2, the number of the air outlet holes 118 is unlimited and is annularly arranged, and the air outlet holes 118 are communicated with the gas collection channel 117; a base for placing a heating resistor rod is fixed on the inner side of the sealing cover 113, an electric wire electrically connected with the base is connected on the outer side of the sealing cover 113, and the other end of the electric wire is connected with a power supply 119.
The gas extraction device 2 consists of a gas collecting pipe 21, an extraction pump 22 and a connecting pipe 23 which are communicated in sequence; the waste gas treatment device 3 is composed of an activated carbon adsorber 31, a secondary adsorber 32, an induced draft fan 33 and an exhaust pipe 34 which are communicated in sequence. The gas collecting pipe 21 is communicated with the gas outlet 118, and the connecting pipe 23 is communicated with the activated carbon absorber 31. The device can effectively realize the extraction and treatment of gas. The gas extraction device can be provided with a plurality of gas collecting pipes corresponding to one transverse repair pipe, and can also be provided with a single gas pipe corresponding to a single transverse repair pipe. The in-situ repair device also comprises a gas detection device; the gas detection device comprises a gas detector and a temperature detector and is arranged at the position 5cm away from the outlet of the exhaust pipe. In the repairing process, real-time data is collected through a monitor, and then the repairing condition is analyzed.
Application example 1
As shown in fig. 1, a pilot test is performed on a site of a gas station in zhejiang province, the site is located in suburb and close to a road and is still in use at present, and the specific in-situ repair method comprises the following steps:
(1) underground soil and underground water of gas station site to be repairedThe pollution condition of the soil is investigated; the test area was determined to be 100m2The main pollutants of the site are TPH factors such as gasoline and diesel oil, the highest pollutant concentration is 1300mg/kg, the pollution depth is 2-4 m, and the site soil permeability coefficient is 4.5 × 10-7m/s。
(2) Performing point injection of calcium sulfate from the ground surface of the gas station site downwards, and forming a repair protective layer after maintenance; the density of point injection is (the injection radius is 0.5-1.5m), the depth is 20cm, after 5 days of maintenance, a repair protective layer 4 is formed at the depth of 20cm below the ground of the whole refueling station, the repair protective layer 4 is a gas-insulated calcium sulfate layer injected on the surface layer of the ground, the communication between the ground and the ground is blocked, and the surface layer of the ground is prevented from being influenced by the diffusion of underground pollutants (as shown in figure 1).
(3) After the maintenance of the repairing protective layer is finished, digging a vertical downward longitudinal side well on the inner side of a gas station site far away from a traffic road; the lateral well has a depth of 3.5m, a width of 1.2m and a length of 5 m.
(4) According to the investigation result of the step (1), layout of transverse well points is carried out, and the number of the transverse well points is designed to be 4; according to pollution detection data, setting the layout elevation of the transverse well, and sequentially from the ground to the bottom: 2.5m, 3m, 3.5m and 4.5m (the transverse wells are not arranged in a row in the longitudinal direction, but are spatially arranged). And the side well is used as the starting point of drilling, and the horizontal well building is carried out to the pollution source area of the gas station site; and when the well is transversely built, a transverse repairing pipe is adopted for well building.
Inserting a transverse repairing pipe which is not sleeved with a sealing cover into underground soil of a gas station site at different depths in a direction vertical to the inner wall of the side well, and extending into an underground pollution source area of the gas station site; and inserting the heating resistance rod into the soil on the inner layer of the transverse repairing pipe, and installing a sealing cover.
(5) And starting the heating resistance rod, continuously heating for 48h, then starting the gas extraction device and the waste gas treatment device, and collecting the volatile organic pollutants in the transverse repair pipe.
After 55 days of continuous repair, sampling analysis is carried out at preset monitoring points, the removal rate of pollutants reaches 95%, and the preset repair target is achieved.
Claims (10)
1. The utility model provides a soil remediation device for the normal position of filling station place underground soil and groundwater is restoreed, its characterized in that includes: the volatile gas capturing device, the gas extraction device and the waste gas treatment device are sequentially communicated;
the volatile gas capturing device is composed of a plurality of transverse repairing pipes which are transversely arranged at the underground soil pollution source, and each transverse repairing pipe is communicated with the gas extraction device;
the transverse repair pipe is of an inner-layer tubular structure and an outer-layer tubular structure, one end of the transverse repair pipe is an opening end, the other end of the transverse repair pipe is a sealing end, and a detachable sealing cover is sleeved on the sealing end; the open end extends into a pollution source area; the inner layer pipe body of the transverse repair pipe is provided with a vent hole, and a gas collection channel is formed between the inner layer and the outer layer; the sealing cover is provided with an air outlet communicated with the air collecting channel; the sealing cover is also provided with a heating resistance rod;
the air outlet is also communicated with the gas extraction device through a pipeline.
2. The soil remediation device of claim 1 wherein said gas extraction means comprises of a gas manifold, an extraction pump and a connecting pipe in series communication; the waste gas treatment device consists of an activated carbon adsorber, a secondary adsorber, a draught fan and an exhaust pipe which are sequentially communicated; the gas collecting pipe is communicated with the gas outlet hole, and the connecting pipe is communicated with the activated carbon absorber.
3. The soil remediation device of claim 1 further including gas detection means; the gas detection device comprises a gas detector and a temperature detector and is arranged at the outlet of the exhaust pipe.
4. The soil remediation device of claim 1 wherein the transverse remediation tube has an inner layer of between 30 and 60cm diameter and an outer layer of between 35 and 65cm diameter.
5. The soil remediation device of claim 1 wherein said ventilation apertures are circular holes arranged in a quincuncial pattern; the sealing cover is provided with a plurality of air outlets which are of an annular structure.
6. A method for repairing underground soil and underground water of a gas station site by using the soil remediation device of any one of claims 1 to 5, comprising the steps of:
(1) investigating the pollution condition of underground soil and underground water of a gas station site to be repaired;
(2) performing point injection of calcium sulfate from the ground surface of the gas station site downwards, and forming a repair protective layer after maintenance;
(3) after the maintenance of the repairing protective layer is finished, digging a vertical downward longitudinal side well on the inner side of a gas station site far away from a traffic road;
(4) according to the investigation result of the step (1), carrying out layout of transverse well points, and carrying out transverse well construction on a pollution source area of a gas station site by taking a side well as a starting point of drilling; installing a volatile gas capture device, a gas extraction device and an exhaust gas treatment device in the in-situ remediation device of claim 1;
inserting a transverse repairing pipe which is not sleeved with a sealing cover into underground soil of a gas station site at different depths in a direction vertical to the inner wall of the side well, and extending into an underground pollution source area of the gas station site; inserting a heating resistance rod into soil on the inner layer of the transverse repairing pipe, and installing a sealing cover;
(5) and starting the heating resistance rod, the gas extraction device and the waste gas treatment device, and collecting the volatile organic pollutants in the transverse repair pipe.
7. The method of claim 1, wherein in step (1), the field is investigated for soil physicochemical properties, type of contaminant, and field area distribution of the field.
8. The method according to claim 1, wherein in the step (2), the depth of the repair protection layer is 15 to 25 cm.
9. The method of claim 1, wherein in step (3), the layout of the lateral well points comprises the number, location, and depth of well points.
10. The method of claim 1, wherein in step (3), the lateral well has a depth of 2 to 4m, a length of 3 to 6m, and a width of 1.5 to 3 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010323704.8A CN111515237A (en) | 2020-04-22 | 2020-04-22 | Soil remediation device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010323704.8A CN111515237A (en) | 2020-04-22 | 2020-04-22 | Soil remediation device and method |
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| CN111515237A true CN111515237A (en) | 2020-08-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517622A (en) * | 2020-11-18 | 2021-03-19 | 吉林大学 | Contaminated soil strengthening in-situ thermal desorption heating device and method |
| CN113798312A (en) * | 2021-09-29 | 2021-12-17 | 上海市政工程设计研究总院（集团）有限公司 | Thermal desorption device for repairing polluted site below building |
| CN115502194A (en) * | 2022-08-10 | 2022-12-23 | 南京工业大学 | Method for repairing polluted site based on directional bedding drilling multiphase extraction technology |
-
2020
- 2020-04-22 CN CN202010323704.8A patent/CN111515237A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112517622A (en) * | 2020-11-18 | 2021-03-19 | 吉林大学 | Contaminated soil strengthening in-situ thermal desorption heating device and method |
| CN112517622B (en) * | 2020-11-18 | 2022-01-28 | 吉林大学 | Contaminated soil strengthening in-situ thermal desorption heating device and method |
| CN113798312A (en) * | 2021-09-29 | 2021-12-17 | 上海市政工程设计研究总院（集团）有限公司 | Thermal desorption device for repairing polluted site below building |
| CN115502194A (en) * | 2022-08-10 | 2022-12-23 | 南京工业大学 | Method for repairing polluted site based on directional bedding drilling multiphase extraction technology |
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