CN111604368A - Device for continuously repairing polluted soil by supercritical carbon dioxide extraction - Google Patents
Device for continuously repairing polluted soil by supercritical carbon dioxide extraction Download PDFInfo
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- CN111604368A CN111604368A CN202010495786.4A CN202010495786A CN111604368A CN 111604368 A CN111604368 A CN 111604368A CN 202010495786 A CN202010495786 A CN 202010495786A CN 111604368 A CN111604368 A CN 111604368A
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- gate valve
- cavity
- extraction
- pipeline
- discharge
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- 239000002689 soil Substances 0.000 title claims abstract description 48
- 238000003815 supercritical carbon dioxide extraction Methods 0.000 title claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 70
- 238000011084 recovery Methods 0.000 claims abstract description 29
- 230000007704 transition Effects 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 238000005067 remediation Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 44
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 22
- 239000001569 carbon dioxide Substances 0.000 abstract description 22
- 239000003344 environmental pollutant Substances 0.000 abstract description 12
- 231100000719 pollutant Toxicity 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000011066 ex-situ storage Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000000194 supercritical-fluid extraction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a device for continuously repairing polluted soil by supercritical carbon dioxide extraction, which comprises an extraction cavity, a spiral conveying blade and a plurality of extraction blades, wherein the extraction cavity is obliquely arranged from left to right and is internally provided with the spiral conveying blade; the upper part of the left end of the extraction cavity is provided with a soil inlet, the lower part of the left end is provided with an extractant inlet, the lower part of the right end of the extraction cavity is provided with a soil outlet, and the upper part of the left end is provided with an extractant outlet; a feeding gate valve, a feeding cavity, a vacuum gate valve, a vacuum cavity, a transition gate valve, a transition cavity and an inlet gate valve are sequentially arranged on the soil inlet from top to bottom; an outlet gate valve, a discharging cavity, a discharging gate valve, a recovery cavity, a recovery gate valve, a discharging cavity and a discharging gate valve are sequentially arranged on the soil outlet from top to bottom; during feeding, the feeding gate valve, the vacuum gate valve, the transition gate valve and the inlet gate valve are opened and closed alternately in sequence; during discharging, the outlet gate valve, the discharge gate valve, the recovery gate valve and the discharge gate valve are opened and closed alternately in sequence. The invention utilizes the supercritical state of carbon dioxide to extract and separate pollutants, thereby effectively improving the extraction capacity of the pollutants.
Description
Technical Field
The invention relates to a contaminated soil remediation device, in particular to a device for continuously remediating contaminated soil through supercritical carbon dioxide extraction.
Background
With the rapid development of the industry, a series of pollution problems caused by the rapid development of the industry become more serious, and many industrial fields are seriously polluted after being used, cannot be used for the second time, and have to be repaired.
In the existing soil remediation technology, in-situ remediation or ex-situ remediation is mostly adopted for treatment. Wherein, the in-situ remediation does not move the polluted soil, and adopts a direct in-situ treatment mode to remove pollutants; ectopic remediation is to move soil into remediation equipment by utilizing equipment and then carry out a series of treatment means, so that the purpose of eliminating pollutants is achieved. The common treatment means for ex-situ remediation are physical pyrolysis, chemical leaching, landfill and the like, but the means usually cause waste of energy and substances or cause the problems of treatment agent residue, secondary pollution and the like after pollution treatment.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a device for continuously repairing the polluted soil by supercritical carbon dioxide extraction, which utilizes the inertia of carbon dioxide which is easy to prepare and can be recycled, so that the soil has no harmful solvent residue after being treated, and is safe, nontoxic and pollution-free; the carbon dioxide supercritical state is utilized to extract and separate the pollutants, and the pollutant extraction capacity is effectively improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a device for continuously restoring polluted soil by supercritical carbon dioxide extraction comprises an extraction cavity which is obliquely arranged from left to right and is internally provided with a screw conveying blade; a soil inlet is formed in the upper portion of the left end of the extraction cavity, an extractant inlet is formed in the lower portion of the left end of the extraction cavity, a soil outlet is formed in the lower portion of the right end of the extraction cavity, and an extractant outlet is formed in the upper portion of the left end of the extraction cavity; a feeding pipeline is arranged on the soil inlet, and a feeding gate valve, a feeding cavity, a vacuum gate valve, a vacuum cavity, a transition gate valve, a transition cavity and an inlet gate valve are sequentially arranged on the feeding pipeline from top to bottom; the soil outlet is provided with a discharge pipeline, and the discharge pipeline is sequentially provided with an outlet gate valve, a discharge cavity, a discharge gate valve, a recovery cavity, a recovery gate valve, a discharge cavity and a discharge gate valve from top to bottom; during feeding, the feeding gate valve, the vacuum gate valve, the transition gate valve and the inlet gate valve are opened and closed alternately in sequence; and during discharging, the outlet gate valve, the discharge gate valve, the recovery gate valve and the discharge gate valve are opened and closed alternately in sequence.
Furthermore, a vacuum-pumping pipeline is installed on one side of the vacuum cavity, and a vacuum pump is installed on the vacuum-pumping pipeline.
Furthermore, an extractant discharge pipeline is arranged on the extractant outlet, and an extraction liquid cooler is arranged at the tail end of the extractant discharge pipeline; an extraction pressure reducing valve, a gas-liquid separator, an activated carbon adsorption tank and a pressure pump are sequentially arranged on the extraction agent discharge pipeline from an extraction agent outlet to the extraction liquid cooler; the outlet of the extract liquid cooler is connected with the extractant inlet through an extractant feeding pipeline.
Furthermore, an extractant recovery pipeline communicated with an extractant discharge pipeline between the extraction pressure reducing valve and the gas-liquid separator is installed on one side of the recovery cavity, and a recovery pump is installed on the extractant recovery pipeline.
Furthermore, one side of the unloading cavity is provided with an unloading pressurizing pipeline communicated with the extractant adding pipeline, and the unloading pressurizing pipeline is provided with an unloading pressure reducing valve and an unloading electromagnetic valve.
Furthermore, a feeding pressure reducing pipeline communicated with the extracting agent adding pipeline is installed on one side of the feeding cavity, and a feeding pressure reducing valve is installed on the feeding pressure reducing pipeline.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the invention utilizes the inertia of carbon dioxide which is easy to prepare and can be recycled, so that the soil has no harmful solvent residue after being treated, and is safe, nontoxic and pollution-free; the carbon dioxide supercritical state is utilized to extract and separate the pollutants, and the pollutant extraction capacity is effectively improved.
The main structure of the invention is an extraction cavity conveyed by a blade, and an extractant for repairing polluted soil is carbon dioxide in a supercritical state. The extraction cavity is a closed heating cavity, and proper temperature and pressure are set in the cavity to keep the supercritical state of the carbon dioxide extractant; introducing a supercritical carbon dioxide extracting agent into the extraction cavity, and uniformly stirring the materials by using a blade; a plurality of groups of gate valves and cavities are arranged at a soil inlet and a soil outlet of the extraction cavity, and the internal environment of the extraction cavity is ensured to be stable through the alternate sequential opening and closing of the plurality of groups of gate valves and the filling of the carbon dioxide extractant; after extraction is finished, the supercritical carbon dioxide extracting agent is decompressed and vaporized through the extraction pressure reducing valve, and then the extracted pollutants are separated by the gas-liquid separator, so that the secondary soil pollution of the extracting agent is avoided, the separation efficiency is improved, the carbon dioxide generated by vaporization is treated and then participates in the next extraction process again, the recycling of the extracting agent is realized, and the cost is saved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood and to be implemented in accordance with the content of the description, the following detailed description is made with reference to the embodiments of the present invention and accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: 1. the device comprises a feeding gate valve, 2, a feeding cavity, 3, a vacuum gate valve, 4, a vacuum cavity, 5, a vacuum pump, 6, a transition gate valve, 7, a transition cavity, 8, an inlet gate valve, 9, an extraction cavity, 10, an outlet gate valve, 11, a discharge cavity, 12, a discharge gate valve, 13, a recovery cavity, 14, a recovery pump, 15, a recovery gate valve, 16, a discharge cavity, 17, a discharge gate valve, 18, an extraction pressure reducing valve, 19, a gas-liquid separator, 20, an activated carbon adsorption tank, 21, a pressure pump, 22, an extract liquid cooler, 23, a discharge pressure reducing valve, 24, a discharge electromagnetic valve, 25 and a feeding pressure reducing valve.
Detailed Description
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear, the present invention is further described below with reference to the accompanying drawings and embodiments.
As shown in figure 1, the invention discloses a device for continuously repairing polluted soil by supercritical carbon dioxide extraction, which comprises an extraction cavity 9 which is obliquely arranged from left to right and is internally provided with a screw conveying blade; a soil inlet is arranged at the upper part of the left end of the extraction cavity 9, an extractant inlet is arranged at the lower part of the left end, a soil outlet is arranged at the lower part of the right end of the extraction cavity 9, and an extractant outlet is arranged at the upper part of the left end; a feeding pipeline is arranged on the soil inlet, and a feeding gate valve 1, a feeding cavity 2, a vacuum gate valve 3, a vacuum cavity 4, a transition gate valve 6, a transition cavity 7 and an inlet gate valve 8 are sequentially arranged on the feeding pipeline from top to bottom; a discharge pipeline is arranged on the soil outlet, and an outlet gate valve 10, a discharge cavity 11, a discharge gate valve 12, a recovery cavity 13, a recovery gate valve 15, a discharge cavity 16 and a discharge gate valve 17 are sequentially arranged on the discharge pipeline from top to bottom; during feeding, the feeding gate valve 1, the vacuum gate valve 3, the transition gate valve 6 and the inlet gate valve 8 are opened and closed alternately in sequence; during discharging, the outlet gate valve 10, the discharge gate valve 12, the recovery gate valve 15 and the discharge gate valve 17 are alternately opened and closed in sequence. The external environment can be isolated by the sequential alternate opening and closing of the gate valve, and the stability of the internal environment of the extraction cavity 9 is ensured.
A vacuum pumping pipeline is arranged on one side of the vacuum cavity 4, and a vacuum pump 5 is arranged on the vacuum pumping pipeline and used for discharging air entering along with the materials.
An extractant outlet is provided with an extractant discharge pipeline, and the tail end of the extractant discharge pipeline is provided with an extraction liquid cooler 22; an extraction pressure reducing valve 18, a gas-liquid separator 19, an activated carbon adsorption tank 20 and a pressure pump 21 are sequentially arranged on the extraction agent discharge pipeline from an extraction agent outlet to an extraction liquid cooler 22; the outlet of the extract cooler 22 is connected to the extractant inlet via an extractant feed line.
An extractant recovery pipeline communicated with an extractant discharge pipeline between the extraction pressure reducing valve 18 and the gas-liquid separator 19 is installed on one side of the recovery cavity 13, and a recovery pump 14 is installed on the extractant recovery pipeline and used for recovering the extractant discharged along with the materials.
One side of the discharging cavity 16 is provided with a discharging pressurization pipeline communicated with the extractant feeding pipeline, and the discharging pressurization pipeline is provided with a discharging pressure reducing valve 23 and a discharging electromagnetic valve 24. The discharge chamber 16 controls the discharge solenoid valve 24 to introduce carbon dioxide gas according to the valve open/close period to prevent air from entering the extraction chamber.
And a feeding pressure reducing pipeline communicated with the extractant adding pipeline is arranged on one side of the feeding cavity 2, and a feeding pressure reducing valve 25 is arranged on the feeding pressure reducing pipeline.
The main structure of the invention is an extraction cavity 9 conveyed by a blade, and an extractant for repairing the polluted soil is carbon dioxide in a supercritical state. The extraction chamber 9 is a closed heating chamber, and proper temperature and pressure are set in the chamber to keep the supercritical state of the carbon dioxide extractant; introducing a supercritical carbon dioxide extracting agent into the extraction cavity 9, and uniformly stirring the materials by using a blade; a plurality of groups of gate valves and cavities are arranged at a soil inlet and a soil outlet of the extraction cavity 9, and the internal environment of the extraction cavity 9 is ensured to be stable through the alternate sequential opening and closing of the plurality of groups of gate valves and the filling of the carbon dioxide extractant; after extraction, the supercritical carbon dioxide extractant is decompressed and vaporized by the extraction decompression valve 18, and then the extracted pollutants are separated by the gas-liquid separator 19, and the carbon dioxide generated by vaporization is processed and then participates in the next extraction process again.
Contaminated soil continuously supplies into the upper mouth of feeding gate valve 1, and feeding chamber 2 lets in carbon dioxide gas, prevents that the air from getting into the extraction chamber, and vacuum chamber 4 utilizes vacuum pump 5 evacuation for the air that the discharge got into along with the material, and feeding gate valve 1, vacuum gate valve 3, transition gate valve 6 and entrance gate valve 8 open and close in turn in proper order, accomplish the material and discharge the air and get into the process of extraction chamber 9, keep the purity of the pressure in the extraction chamber 9 and extractant simultaneously.
In the extraction cavity 9, the contaminated soil and the supercritical carbon dioxide are mixed and extracted, the upper part of a soil outlet of the extraction cavity 9 is connected with an extraction pressure reducing valve 18 through a pipeline, the supercritical carbon dioxide dissolved with pollutants is vaporized after being reduced in pressure through the extraction pressure reducing valve 18, enters a gas-liquid separator 19 to separate the pollutants and is discharged out of the device, the gas carbon dioxide is purified through an activated carbon adsorption tank 20 and then is pressurized into a supercritical state through a pressure pump 21, and is cooled to a proper temperature through an extract liquid cooler 22, and then enters the extraction cavity 9 through a pipe orifice near a soil inlet of the extraction cavity 9 again, the contaminated soil is mixed, stirred and conveyed through blades in the extraction cavity 9, and meanwhile, the supercritical extraction is carried out.
The extracted soil is discharged out of the extraction chamber 9 through a soil outlet, and is discharged out of the system through the discharge chamber 11, the recovery chamber 13 and the discharge chamber 16 by means of the alternate opening and closing of the outlet gate valve 10, the discharge gate valve 12, the recovery gate valve 15 and the discharge gate valve 17 in sequence.
It is to be understood that the above-described embodiments are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (6)
1. A device for continuously repairing polluted soil by supercritical carbon dioxide extraction is characterized in that: comprises an extraction cavity (9) which is obliquely arranged from left to right and is internally provided with a screw conveying blade; a soil inlet is formed in the upper portion of the left end of the extraction cavity (9), an extracting agent inlet is formed in the lower portion of the left end of the extraction cavity, a soil outlet is formed in the lower portion of the right end of the extraction cavity (9), and an extracting agent outlet is formed in the upper portion of the left end of the extraction cavity; a feeding pipeline is arranged on the soil inlet, and a feeding gate valve (1), a feeding cavity (2), a vacuum gate valve (3), a vacuum cavity (4), a transition gate valve (6), a transition cavity (7) and an inlet gate valve (8) are sequentially arranged on the feeding pipeline from top to bottom; a discharge pipeline is arranged on the soil outlet, and an outlet gate valve (10), a discharge cavity (11), a discharge gate valve (12), a recovery cavity (13), a recovery gate valve (15), a discharge cavity (16) and a discharge gate valve (17) are sequentially arranged on the discharge pipeline from top to bottom; during feeding, the feeding gate valve (1), the vacuum gate valve (3), the transition gate valve (6) and the inlet gate valve (8) are opened and closed alternately in sequence; during discharging, the outlet gate valve (10), the discharge gate valve (12), the recovery gate valve (15) and the discharge gate valve (17) are opened and closed alternately in sequence.
2. The apparatus for supercritical carbon dioxide extraction continuous remediation of contaminated soil as claimed in claim 1, wherein: and a vacuum pumping pipeline is arranged on one side of the vacuum cavity (4), and a vacuum pump (5) is arranged on the vacuum pumping pipeline.
3. The apparatus for supercritical carbon dioxide extraction continuous remediation of contaminated soil as claimed in claim 1, wherein: an extractant discharge pipeline is arranged on the extractant outlet, and an extraction liquid cooler (22) is arranged at the tail end of the extractant discharge pipeline; an extraction pressure reducing valve (18), a gas-liquid separator (19), an activated carbon adsorption tank (20) and a pressure pump (21) are sequentially arranged on the extraction agent discharge pipeline from an extraction agent outlet to an extraction liquid cooler (22); the outlet of the extract liquid cooler (22) is connected with the extractant inlet through an extractant feeding pipeline.
4. The apparatus for supercritical carbon dioxide extraction continuous remediation of contaminated soil as claimed in claim 3, wherein: and an extractant recovery pipeline communicated with an extractant discharge pipeline between the extraction pressure reducing valve (18) and the gas-liquid separator (19) is arranged on one side of the recovery cavity (13), and a recovery pump (14) is arranged on the extractant recovery pipeline.
5. The apparatus for supercritical carbon dioxide extraction continuous remediation of contaminated soil as claimed in claim 3, wherein: and a discharge pressurizing pipeline communicated with the extractant adding pipeline is arranged on one side of the discharge cavity (16), and a discharge pressure reducing valve (23) and a discharge electromagnetic valve (24) are arranged on the discharge pressurizing pipeline.
6. The apparatus for supercritical carbon dioxide extraction continuous remediation of contaminated soil as claimed in claim 3, wherein: and a feeding pressure reducing pipeline communicated with the extractant adding pipeline is installed on one side of the feeding cavity (2), and a feeding pressure reducing valve (25) is installed on the feeding pressure reducing pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495786.4A CN111604368A (en) | 2020-06-03 | 2020-06-03 | Device for continuously repairing polluted soil by supercritical carbon dioxide extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010495786.4A CN111604368A (en) | 2020-06-03 | 2020-06-03 | Device for continuously repairing polluted soil by supercritical carbon dioxide extraction |
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| Publication Number | Publication Date |
|---|---|
| CN111604368A true CN111604368A (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010495786.4A Pending CN111604368A (en) | 2020-06-03 | 2020-06-03 | Device for continuously repairing polluted soil by supercritical carbon dioxide extraction |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1078014A (en) * | 1992-01-14 | 1993-11-03 | 美国电话电报公司 | Method and the device of getting rid of ground contamination |
| CN102527709A (en) * | 2012-01-09 | 2012-07-04 | 中国科学院武汉岩土力学研究所 | Supercritical fluid restoration treatment system of polluted soil |
| CN102615096A (en) * | 2012-04-09 | 2012-08-01 | 长沙威保特环保科技有限公司 | Soil vacuum heater |
| CN103230932A (en) * | 2013-04-11 | 2013-08-07 | 华北电力大学 | A device for remediation of organic contaminated soil by using supercritical CO2 fluid and a remediation method |
| CN106363017A (en) * | 2016-10-14 | 2017-02-01 | 同济大学 | System and method for repairing polycyclic aromatic hydrocarbon contaminated soil |
| CN110681690A (en) * | 2019-11-08 | 2020-01-14 | 秦皇岛开发区春光铸造机械有限公司 | Device and method for repairing polluted soil through continuous vacuum thermal desorption |
| CN212238609U (en) * | 2020-06-03 | 2020-12-29 | 秦皇岛开发区春光铸造机械有限公司 | Device for continuously repairing polluted soil by supercritical carbon dioxide extraction |
-
2020
- 2020-06-03 CN CN202010495786.4A patent/CN111604368A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1078014A (en) * | 1992-01-14 | 1993-11-03 | 美国电话电报公司 | Method and the device of getting rid of ground contamination |
| CN102527709A (en) * | 2012-01-09 | 2012-07-04 | 中国科学院武汉岩土力学研究所 | Supercritical fluid restoration treatment system of polluted soil |
| CN102615096A (en) * | 2012-04-09 | 2012-08-01 | 长沙威保特环保科技有限公司 | Soil vacuum heater |
| CN103230932A (en) * | 2013-04-11 | 2013-08-07 | 华北电力大学 | A device for remediation of organic contaminated soil by using supercritical CO2 fluid and a remediation method |
| CN106363017A (en) * | 2016-10-14 | 2017-02-01 | 同济大学 | System and method for repairing polycyclic aromatic hydrocarbon contaminated soil |
| CN110681690A (en) * | 2019-11-08 | 2020-01-14 | 秦皇岛开发区春光铸造机械有限公司 | Device and method for repairing polluted soil through continuous vacuum thermal desorption |
| CN212238609U (en) * | 2020-06-03 | 2020-12-29 | 秦皇岛开发区春光铸造机械有限公司 | Device for continuously repairing polluted soil by supercritical carbon dioxide extraction |
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