CN111438172A - In-situ remediation device and method for volatile organic contaminated soil - Google Patents
In-situ remediation device and method for volatile organic contaminated soil Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 95
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 238000000746 purification Methods 0.000 claims abstract description 53
- 238000003795 desorption Methods 0.000 claims abstract description 50
- 230000003197 catalytic effect Effects 0.000 claims abstract description 45
- 238000000926 separation method Methods 0.000 claims abstract description 37
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims description 9
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- 238000011144 upstream manufacturing Methods 0.000 claims description 3
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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
- B09C1/005—Extraction of vapours or gases using vacuum or venting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating
- B01D2259/4009—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating using hot gas
-
- 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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- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention provides an in-situ remediation device and method for volatile organic contaminated soil, relates to the technical field of remediation of contaminated land, and solves the technical problems that most extracted gas adopts a single activated carbon adsorption technology, and needs to be replaced for multiple times or is large in filling amount at one time after activated carbon is saturated. The device comprises a well group arrangement unit, a negative pressure extraction unit, a gas-liquid separation unit, a tail gas treatment unit, a gas phase release unit and a monitoring unit; the tail gas treatment unit comprises a switching device, and an absorption and desorption device and a catalytic purification device which are connected in parallel; the switching device can control the organic gas at the outlet of the gas-liquid separation unit to selectively enter the adsorption and desorption device or the catalytic purification device for purification treatment. The organic gas enters the absorption and desorption device for purification when the concentration is lower than a set value, and enters the catalytic purification device for purification treatment when the concentration is higher than the set value, so that a more suitable treatment mode can be adopted conveniently according to different concentrations, the treatment capacity can meet the requirements, and the flexibility and the reliability are higher.
Description
Technical Field
The invention relates to the technical field of polluted land restoration, in particular to an in-situ restoration device and method for volatile organic polluted soil.
Background
The rapid development of modern industry in China makes the environmental pollution problem prominent, and especially the pollution of soil and underground water caused by the unreasonable disposal of dangerous waste. Soil pollution has the characteristics of concealment, difficulty in reversion and the like, can directly or indirectly harm human health, and can cause other environmental problems. At present, common pollutants can be classified into four categories according to the properties of the pollutants, namely organic pollutants, heavy metals, radioactive elements and pathogenic microorganisms. In general, remediation techniques vary for different contaminants. Among them, the common remediation techniques for soil pollution caused by volatile organic compounds can be divided into two categories: the first is an in-situ soil remediation technology, and the second is an ex-situ soil remediation technology. In-situ remediation is more economical and effective than remediation after soil excavation (i.e., ex-situ soil remediation), has little influence on the surrounding environment, treats pollutants on site to degrade and attenuate the pollutants, does not need to build expensive ground environment engineering infrastructure and remote transportation, is simpler to operate and maintain, and has the advantage of remediation of deeply polluted soil. In the in-situ soil remediation technology, the soil vapor extraction technology is suitable for removing volatile organic pollutants in unsaturated soil, has simple operation and low cost, does not damage the soil structure,
the applicant has found that the prior art has at least the following technical problems:
firstly, most of in-situ soil air-stripping equipment in China stays at a pilot test experimental stage, so that few engineering application cases exist, and the inspection of actual operation is not available; secondly, the vast majority of extracted gas adopts a single activated carbon adsorption technology, and the problems that the activated carbon needs to be replaced for many times after being saturated or the amount of a disposable filler is large exist; thirdly, under the condition that the concentration of volatile organic pollutants in soil fluctuates constantly and fluctuates greatly, the risk of incomplete tail gas adsorption or instantaneous saturation of active carbon exists; and fourthly, the deviation of the extraction efficiency is large under different geological conditions.
Disclosure of Invention
The invention aims to provide an in-situ remediation device and method for volatile organic contaminated soil, and aims to solve the technical problems that in the prior art, most of extracted gas adopts a single activated carbon adsorption technology, and the activated carbon is required to be replaced for multiple times after being saturated or the filling amount is large at one time. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an in-situ remediation device for volatile organic contaminated soil, which comprises:
the well group arrangement unit is used for extracting the system of the polluted area;
the negative pressure extraction unit is used for extracting and driving organic gas in the polluted area;
the gas-liquid separation unit is communicated with the negative pressure extraction unit through a pipeline and can carry out gas-liquid separation on the extracted organic gas;
the tail gas treatment unit is communicated with the gas-liquid separation unit through a pipeline and is used for purifying the separated organic gas;
the gas phase release unit is communicated with the tail gas treatment unit through a pipeline and discharges the treated gas;
the monitoring unit is arranged at the front end of the tail gas treatment unit and is used for monitoring the concentration and the flow of the organic gas at the inlet of the tail gas treatment unit;
the tail gas treatment unit comprises a switching device, and an absorption and desorption device and a catalytic purification device which are connected in parallel; according to the monitoring result of the monitoring unit, the switching device can control the organic gas at the outlet of the gas-liquid separation unit to selectively enter the adsorption and desorption device or the catalytic purification device for purification treatment.
Optionally, the adsorption and desorption device comprises an activated carbon adsorption tank and a desorption fan, the activated carbon adsorption tank is filled with activated carbon adsorption bodies, and the desorption fan is arranged in a connecting pipeline between the activated carbon adsorption tank and the catalytic purification device.
Optionally, the switching device includes an adsorption valve, a catalytic valve and a desorption valve, the adsorption valve is installed at the front end of the air inlet of the activated carbon adsorption box, the catalytic valve is installed at the front end of the air inlet of the catalytic purification device, and the desorption valve is installed in the catalytic purification device and a pipeline between the desorption fans.
Optionally, the well group arrangement unit includes a layered extraction well group, the layered extraction well group is composed of a plurality of vapor extraction wells, and the plurality of vapor extraction wells are disposed in different strata.
Optionally, the well group arrangement unit comprises a main gas transmission pipeline and a plurality of branch pipes connected in parallel, each branch pipe is communicated with one gas phase extraction well, and outlets of the plurality of branch pipes are communicated with the main gas transmission pipeline; each branch pipe is provided with a layering electromagnetic valve.
Optionally, the gas-liquid separation unit comprises a gas-liquid separator and a waste collection tank for collecting separated liquid.
Optionally, the negative pressure extraction unit comprises a negative pressure fan, and the negative pressure fan is arranged in a pipeline between the gas-liquid separation unit and the tail gas treatment unit.
Optionally, the gas phase release unit comprises a chimney and a main exhaust fan arranged upstream of the chimney.
Optionally, the tail gas treatment unit further comprises a buffer tank disposed in the pipeline near the exhaust gas inlet of the tail gas treatment unit.
The invention provides a method for in-situ remediation of volatile organic contaminated soil by adopting any one of the devices, which comprises the following steps:
A. the well group arrangement unit is driven by the negative pressure extraction unit to perform system extraction on the polluted area;
B. the gas-liquid separation unit is used for carrying out gas-liquid separation on the extracted organic gas;
C. controlling the separated organic gas to enter an absorption and desorption device or a catalytic purification device through a switching device according to the monitoring result of the monitoring unit, wherein the organic gas enters the absorption and desorption device for purification when the concentration of the organic gas is lower than a set value, and enters the catalytic purification device for purification treatment when the concentration of the organic gas is higher than the set value;
D. the treated gas is discharged through a gas phase discharge unit.
The invention provides an in-situ remediation device and method for volatile organic contaminated soil, wherein a tail gas treatment unit of the in-situ remediation device for volatile organic contaminated soil comprises an absorption and desorption device and a catalytic purification device which are connected in parallel, and according to the monitoring result of a monitoring unit, separated organic gas can be controlled by a switching device to selectively enter the absorption and desorption device or the catalytic purification device, wherein the organic gas enters the absorption and desorption device for purification when the concentration of the organic gas is lower than a set value, and enters the catalytic purification device for purification treatment when the concentration of the organic gas is higher than the set value; compare with current single active carbon adsorption mode, be convenient for take more suitable processing mode according to the gas of different concentration, handle and can satisfy the needs easily, can not appear changing many times or the great problem of disposable filling volume after the active carbon saturation, flexibility and reliability are higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic connection diagram of an in-situ remediation device for volatile organic contaminated soil according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a connection relationship between the tail gas treatment unit and the gas phase release unit;
FIG. 3 is a schematic top view of the structure of FIG. 2;
FIG. 4 is a schematic top view of the gas-liquid separation unit and the negative pressure extraction unit;
FIG. 5 is a schematic front view of the top-view structure of the gas-liquid separation unit and the negative pressure extraction unit;
FIG. 6 is a schematic diagram of a well group arrangement;
FIG. 7 is a schematic top view of the structure of FIG. 6;
FIG. 8 is a schematic diagram of a vapor extraction well configuration;
fig. 9 is a schematic connection diagram of the layered control valve.
In the figure 1, a well group arrangement unit; 11. drilling a hole of 127 mm; 12. DN50 chemical grade PVC slotted pipe; 13. 80 mesh nylon net; 14. inserting a screwed plug; 15. a threaded cap; 16. a vacuum gauge; 17. DN50 ball valve; 18. an air extraction pipeline; 19. a support; 20. a steel wire hose; 2. a gas-liquid separation unit; 21. a gas-liquid separator; 211. a drain valve; (ii) a 22. A waste liquid collecting tank; 23. a main pipeline; 24. a filter; 25. a sampling valve; 26. an electric motor; 27. a negative pressure fan; 28. an exhaust muffler; 29. detecting a meter; 3. a negative pressure extraction unit; 4. a tail gas treatment unit; 411. an activated carbon adsorption tank; 412. an adsorption valve; 413. desorbing the pipeline; 414. a desorption valve; 415. an adsorption pipeline; 416. a desorption fan; 42. a catalytic purification device; 43. a buffer tank; 44. an exhaust gas inlet; 45. an air cooler; 46. supplementing a cold air blower; 47. an air supply opening; 5. a gas phase releasing unit; 51. a main exhaust fan; 52. a chimney; 521. a detection port; 522. a detection platform; 6. an equipment platform; 7. bentonite; 8. 2-4mm quartz sand gravel material; 9. layered solenoid valves.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1, the present invention provides an in-situ remediation device for volatile organic contaminated soil, comprising:
the well group arrangement unit 1 is used for extracting a system in a polluted area;
a negative pressure extraction unit 3 as an extraction drive of the organic gas in the contaminated area;
the gas-liquid separation unit 2 is communicated with the negative pressure extraction unit 3 through a pipeline and can carry out gas-liquid separation on the extracted organic gas; the connection relationship between the negative pressure extraction unit 3 and the gas-liquid separation unit 2 is shown in fig. 4 and 5.
The tail gas treatment unit 4 is communicated with the gas-liquid separation unit 2 through a pipeline and is used for purifying the separated organic gas;
the gas phase release unit 5 is communicated with the tail gas treatment unit 4 through a pipeline and discharges the treated gas; the connection relationship between the tail gas treatment unit 4 and the gas phase releasing unit 5 is shown in fig. 2 and 3.
The monitoring unit is arranged at the front end of the tail gas treatment unit 4 and is used for monitoring the concentration and the flow of the organic gas at the inlet of the tail gas treatment unit 4;
wherein, the tail gas treatment unit 4 comprises a switching device and an absorption and desorption device and a catalytic purification device 42 which are connected in parallel; according to the monitoring result of the monitoring unit, the switching device can control the organic gas at the outlet of the gas-liquid separation unit 2 to selectively enter the absorption and desorption device or the catalytic purification device 42 for purification treatment. Before entering the tail gas treatment unit 4, the gas passes through an online concentration monitor (self-test probe) arranged on the pipe wall, and after passing through the buffer tank 43 and the air cooler 45, the system automatically controls the valve, so that the gas passes through different treatment devices. If the concentration is low, the mixture is treated in an activated carbon adsorption tank 411, and if the concentration is high, the mixture is treated in a catalytic purification device 42.
The tail gas treatment unit 4 comprises an absorption and desorption device and a catalytic purification device 42 which are connected in parallel, and can control the separated organic gas to selectively enter the absorption and desorption device or the catalytic purification device 42 through a switching device according to the monitoring result of the monitoring unit, wherein the organic gas enters the absorption and desorption device for purification when the concentration of the organic gas is lower than a set value, and enters the catalytic purification device 42 for purification when the concentration of the organic gas is higher than the set value; compared with the existing single activated carbon adsorption mode, the method is convenient for adopting a more appropriate treatment mode according to gases with different concentrations, has higher flexibility and reliability, and simultaneously avoids the problem that the activated carbon is replaced for multiple times after saturation or the filling amount is large at one time.
As an alternative embodiment, the adsorption and desorption device includes an activated carbon adsorption tank 411 and a desorption fan 416, the activated carbon adsorption tank 411 is filled with an activated carbon adsorbent, and the desorption fan 416 is disposed in the connecting pipeline between the activated carbon adsorption tank 411 and the catalytic purification device 42.
The activated carbon adsorption tank 411 is filled with an activated carbon adsorbent which is a renewable activated carbon adsorbent and is used for adsorbing low-concentration organic gas.
As an alternative embodiment, the switching device includes an adsorption valve 412, a catalytic valve and a desorption valve 414, the adsorption valve 412 is installed at the front end of the air inlet of the activated carbon adsorption tank 411, the catalytic valve is installed at the front end of the air inlet of the catalytic purification device 42, and the desorption valve 414 is installed in the pipeline between the catalytic purification device 42 and the desorption fan 416.
When the concentration of the organic gas is low, the adsorption valve 412 is opened, and the renewable activated carbon is adopted for adsorption; when desorption is needed, the desorption valve 414 is opened, and the hot gas in the catalytic purification device 42 enters the activated carbon adsorption tank 411 under the action of the desorption fan 416, so that desorption operation is realized; when the concentration of the organic gas is higher, the catalytic valve is opened, the organic gas is purified by adopting a catalytic combustion mode, and the treated gas directly enters the gas-phase release unit 5 and is discharged after being detected to be qualified.
It should be noted that, as shown in fig. 2, the system includes two sets of activated carbon adsorption tanks 411, one set of activated carbon adsorption tanks may be used, and an adsorption valve 412 is disposed at the front end of an air inlet of each set of activated carbon adsorption tank 411. When the first set of activated carbon adsorption tank 411 needs to be desorbed, the adsorption valve 412 of the first set of activated carbon adsorption tank 411 is closed, and the first set of activated carbon adsorption tank does not perform adsorption operation; optionally, an adsorption valve 412 of the second set of activated carbon adsorption tank 411 (standby activated carbon adsorption tank) is opened, the catalytic valve is closed, a desorption valve 414 is opened, and the organic gas enters the second set of activated carbon adsorption tank for adsorption treatment; the hot gas in the catalytic purification device 42 enters the first set of activated carbon adsorption tank under the action of the desorption fan 416, so that the desorption operation is realized. Optionally, the negative pressure extraction device is closed, and the first set of activated carbon adsorption tank is used for desorption operation.
As an alternative embodiment, the well group arrangement unit 1 includes a stratified extraction well group, which is composed of a plurality of vapor extraction wells, and the plurality of vapor extraction wells are disposed in different strata. See fig. 1 and 6-8.
Aiming at the condition that the stratum is polluted, different treatment stratums are divided according to geological conditions and pollutant concentrations, and then gas phase extraction well groups with different depths are arranged to perform layered extraction, so that the extraction efficiency is improved, and the problem of great extraction efficiency deviation under different geological conditions is solved. And each layer of vapor extraction well can realize independent extraction or parallel extraction with other well groups. The individual vapor extraction wells in the well cluster can also be independently controlled, so that the maintenance is convenient, and the targeted removal of pollutants in individual areas is realized.
As an optional implementation mode, the well group arrangement unit comprises a main gas transmission pipeline and a plurality of branch pipes connected in parallel, each branch pipe is communicated with one gas phase extraction well, and outlets of the plurality of branch pipes are communicated with the main gas transmission pipeline; each branch pipe is provided with a layering solenoid valve 9, see fig. 9.
The gas transmission pipeline consists of branch pipes and a main gas transmission pipeline, and an electric valve is arranged on the main gas transmission pipeline, so that layered switching extraction and parallel extraction can be realized. The main pipeline electric valve controls a layered solenoid valve 9, for example, a 7m gas well is pumped, and gas wells at other depths are closed. The stratified vapor extraction wells are manually controlled valves, for example, the valves of each 7m well are independent.
As an alternative embodiment, the gas-liquid separation unit 2 includes a gas-liquid separator 21 and a waste liquid collection tank 22 for collecting the separated liquid.
The separated liquid is discharged into a waste liquid collecting tank 22 through an electric valve for uniform treatment.
As an alternative embodiment, the negative pressure extraction unit 3 comprises a negative pressure fan 27, and the negative pressure fan 27 is disposed in the pipeline between the gas-liquid separation unit 2 and the tail gas treatment unit 4.
The separated gas enters the tail gas treatment unit 4 through the negative pressure fan 27 and the buffer tank 43. The electric valve switch of the field area can be controlled according to different embodiments to realize the gas phase extraction of a specific area.
As an alternative embodiment, the gas phase release unit 5 comprises a chimney 52 and a main exhaust fan 51 arranged upstream of the chimney 52.
As an alternative embodiment, the exhaust gas treatment unit 4 further comprises a buffer tank 43, the buffer tank 43 being arranged in the pipeline near the exhaust gas inlet 44 of the exhaust gas treatment unit 4.
The buffer tank 43 is additionally arranged at the front end of the tail gas treatment, so that the problem of large concentration fluctuation of organic gas is solved, the inlet gas concentration is balanced, the tail gas adsorption is thorough, and the risk of instantaneous saturation of activated carbon is avoided; and the polluted gas is uniformly mixed in the buffer tank 43, so that the catalytic purification device 42 is ensured not to trip due to the fact that the power is increased because of the instantaneous overhigh temperature.
As shown in fig. 1 to 9, the invention provides an in-situ remediation device for volatile organic contaminated soil, which comprises a well group arrangement unit 1 for systematic extraction of a contaminated area, a negative pressure extraction unit 3 for extracting organic gas to the contaminated area, a gas-liquid separation unit 2 for performing gas-liquid separation on the extracted organic gas, a tail gas treatment unit 4 for cooling and treating the separated organic gas, a gas phase release unit 5 for discharging the gas after the treatment and the detection are qualified, and an automatic control unit integrating monitoring and regulation.
The well group arrangement unit 1 is connected with an inlet of the gas-liquid separation unit 2 through a pipeline and is used for conveying the extracted gas to the gas-liquid separation unit 2 for gas-liquid separation. The gas-liquid separation unit 2 is connected with the negative pressure extraction unit 3 through a pipeline, and the negative pressure extraction unit 3 is a power device of the whole system, so that the normal operation of the system is ensured. The negative pressure extraction unit 3 is connected with the tail gas treatment unit 4 through a pipeline and is used for treating the separated gas. The tail gas treatment unit 4 is connected with the gas phase release unit 5 through a pipeline and is used for discharging qualified gas. The automatic control unit comprises a self-test probe and a matched computer, the frequency of the negative pressure fan 27 in the negative pressure extraction unit 3 is adjusted according to different concentrations, the catalytic purification device 42 or the activated carbon adsorption box 411 is used in the tail gas treatment unit 4, remote control and air extraction amount adjustment can be realized, and corresponding tail gas treatment equipment is adopted according to different concentrations. The well group arrangement unit 1 comprises a layered extraction well group, vapor extraction wells of different stratums are arranged according to different pollution conditions in a targeted manner, and a wall of an uphole connecting pipe is connected with a negative pressure transmitter and a sampling manual valve.
The pipeline laying of the field area is divided into a main gas pipeline and branch pipes, and the main pipeline is provided with an electric valve, so that the layered switching extraction, the parallel extraction and the remote control can be realized.
The gas-liquid separation unit 2 is a gas-liquid separator 21 which is matched with a magnetic turning plate liquid level meter, and separated liquid phase is discharged into a waste liquid collecting tank 22 for unified treatment. The front of the gas-liquid separator 21 is provided with a temperature transmitter, a negative pressure transmitter, a flow transmitter, a sampling manual valve and an electric valve, and the sewage discharge pipeline is provided with an electric valve and a sampling manual valve.
The negative pressure extraction unit 3 includes a negative pressure fan 27, a buffer tank 43, an exhaust muffler, and a motor 26. The front end is provided with a negative pressure transmitter, and the rear end is provided with a sampling manual valve and an electric valve.
The tail gas treatment unit 4 comprises a buffer tank 43, a supplementary cooling fan 46, an air cooler 45, a catalytic purification device 42, an activated carbon adsorption tank 411, and a matched fan pipeline and a valve. The supplemental air cooler 46 is for reducing the temperature of the air, and the air cooler 45 is also for reducing the temperature of the air.
The gas phase discharge unit comprises a main exhaust fan 51, a chimney 52 and a detection platform 522, and the upper end of the gas phase discharge unit is provided with a detection port 521.
Whether the gas meets the emission standard or not is detected at the detection port 521, and the gas can be emitted after the gas is qualified.
The invention provides a method for in-situ remediation of volatile organic contaminated soil by adopting any one of the devices, which comprises the following steps:
A. the well group arrangement unit 1 is driven by the negative pressure extraction unit 3 to perform system extraction on the polluted area;
B. the gas-liquid separation unit 2 performs gas-liquid separation on the extracted organic gas;
C. according to the monitoring result of the monitoring unit, the separated organic gas is controlled by the switching device to enter the absorption and desorption device or the catalytic purification device 42, wherein the organic gas enters the absorption and desorption device for purification when the concentration of the organic gas is lower than a set value, and enters the catalytic purification device 42 for purification when the concentration of the organic gas is higher than the set value;
D. the treated gas is discharged through the gas phase releasing unit 5. The treated gas is passed through a detection device on the pipe wall, and then is discharged to the atmosphere through a main exhaust fan 51 and a chimney 52. And if the tail gas is not qualified, the tail gas flows back to the tail gas treatment unit 4 through a return pipeline to be treated again, and the tail gas is discharged after being qualified.
The tail gas treatment stage adopts a treatment mode of combining activated carbon adsorption, desorption and catalytic combustion and switching, solves the problem that activated carbon adsorption is saturated and needs to be replaced, and realizes efficient treatment of volatile organic pollutants. The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An in situ remediation device for volatile organic contaminated soil, comprising:
the well group arrangement unit is used for extracting the system of the polluted area;
the negative pressure extraction unit is used for extracting and driving organic gas in the polluted area;
the gas-liquid separation unit is communicated with the negative pressure extraction unit through a pipeline and can carry out gas-liquid separation on the extracted organic gas;
the tail gas treatment unit is communicated with the gas-liquid separation unit through a pipeline and is used for purifying the separated organic gas;
the gas phase release unit is communicated with the tail gas treatment unit through a pipeline and discharges the treated gas;
the monitoring unit is arranged at the front end of the tail gas treatment unit and is used for monitoring the concentration and the flow of the organic gas at the inlet of the tail gas treatment unit;
the tail gas treatment unit comprises a switching device, and an absorption and desorption device and a catalytic purification device which are connected in parallel; according to the monitoring result of the monitoring unit, the switching device can control the organic gas at the outlet of the gas-liquid separation unit to selectively enter the adsorption and desorption device or the catalytic purification device for purification treatment.
2. The in-situ remediation device for volatile organic contaminated soil according to claim 1, wherein the adsorption and desorption device comprises an activated carbon adsorption tank and a desorption fan, wherein activated carbon adsorption bodies are filled in the activated carbon adsorption tank, and the desorption fan is arranged in a connecting pipeline between the activated carbon adsorption tank and the catalytic purification device.
3. The in-situ remediation device of volatile organic contaminated soil according to claim 2, wherein the switching device comprises an adsorption valve, a catalytic valve and a desorption valve, the adsorption valve is installed at the front end of the air inlet of the activated carbon adsorption tank, the catalytic valve is installed at the front end of the air inlet of the catalytic purification device, and the desorption valve is installed in a pipeline between the catalytic purification device and the desorption fan.
4. The in-situ remediation device of volatile organic contaminated soil according to claim 1, wherein the well group arrangement unit comprises a layered extraction well group, the layered extraction well group is composed of a plurality of vapor extraction wells, and the plurality of vapor extraction wells are disposed in different strata.
5. The in-situ remediation device for volatile organic contaminated soil according to claim 1, wherein the well group arrangement unit comprises a main gas transmission pipeline and a plurality of branch pipes connected in parallel, each branch pipe is communicated with one gas phase extraction well, and outlets of the plurality of branch pipes are communicated with the main gas transmission pipeline; each branch pipe is provided with a layering electromagnetic valve.
6. The apparatus of claim 1, wherein the gas-liquid separation unit comprises a gas-liquid separator and a waste liquid collection tank for collecting separated liquid.
7. The in-situ remediation device of volatile organic contaminated soil according to claim 1, wherein the negative pressure extraction unit comprises a negative pressure blower, and the negative pressure blower is disposed in a pipeline between the gas-liquid separation unit and the tail gas treatment unit.
8. The in situ remediation device of claim 1, wherein the gas phase release unit comprises a chimney and a primary exhaust disposed upstream of the chimney.
9. The in situ remediation device of claim 1, wherein the tail gas treatment unit further comprises a surge tank disposed in the pipeline adjacent the exhaust gas inlet of the tail gas treatment unit.
10. A method for in situ remediation of voc contaminated soil using the apparatus of any of claims 1 to 9, comprising the steps of:
A. the well group arrangement unit is driven by the negative pressure extraction unit to perform system extraction on the polluted area;
B. the gas-liquid separation unit is used for carrying out gas-liquid separation on the extracted organic gas;
C. controlling the separated organic gas to enter an absorption and desorption device or a catalytic purification device through a switching device according to the monitoring result of the monitoring unit, wherein the organic gas enters the absorption and desorption device for purification when the concentration of the organic gas is lower than a set value, and enters the catalytic purification device for purification treatment when the concentration of the organic gas is higher than the set value;
D. the treated gas is discharged through a gas phase discharge unit.
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Application publication date: 20200724 |