CN112355046A - Fluidized bed type device for treating organic matter contaminated soil - Google Patents
Fluidized bed type device for treating organic matter contaminated soil Download PDFInfo
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- CN112355046A CN112355046A CN202011288574.5A CN202011288574A CN112355046A CN 112355046 A CN112355046 A CN 112355046A CN 202011288574 A CN202011288574 A CN 202011288574A CN 112355046 A CN112355046 A CN 112355046A
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Images
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
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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
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a fluidized bed type device for treating organic matter contaminated soil, which comprises a fluidized bed and a cyclone separator, wherein the fluidized bed comprises a fluidized bed cavity, a fluidized bed top cover arranged at the upper part of the fluidized bed cavity and a feeding bin arranged at the bottom of the fluidized bed cavity; a plurality of DBD reaction tubes are arranged in the fluidized bed cavity in an array mode, and the DBD reaction tubes are parallel to a vertical airflow channel in the fluidized bed cavity; the top cover of the fluidized bed is connected with a low-temperature plasma high-voltage power supply connected with the DBD reaction tube; the feed inlet of the cyclone separator is connected with an air outlet arranged on the top cover of the fluidized bed; the lateral wall in feeding storehouse is equipped with soil feed inlet and secondary feed inlet, cyclone's discharge gate is connected with the secondary feed inlet. The device provided by the invention can degrade POPs in soil by using the active components generated by discharge, and can provide technical support for repairing the polluted soil.
Description
Technical Field
The invention belongs to the technical field of organic contaminated soil remediation, and particularly relates to a device for treating persistent organic contaminated soil by using a fluidized bed type DBD plasma.
Background
Persistent Organic Pollutants (POPs) refer to natural or synthetic Organic substances that are difficult to spontaneously degrade in the environment, accumulate through the biological food chain (net), and pose serious threats to human health and the environment. POPs have four important features: bioaccumulation, environmental persistence, long-range migration, and high toxicity.
POPs are currently known worldwide in as many as thousands, which are often homologs or isomers having some similar specific chemical structure. POPs are roughly classified into three types of organic chlorine insecticides such as Aldrin (Aldrin), Chlordane (chloredane), dichlorodiphenyl (DDT), Dieldrin (Dieldrin), Endrin (Endrin), Heptachlor (Heptachlor), Toxaphene (Toxaphene), Mirex (Mirex), and the like, and industrial chemicals such as polychlorinated biphenyl (PCBs) and Hexachlorobenzene (HCB), and impurity derivatives in chemical production such as polychlorinated dibenzofuran (PCDFs) and polychlorinated dibenzodioxin (PCDDs). In recent years, there have been proposed ten types of POPs including Polycyclic Aromatic Hydrocarbons (PAHs), perfluoro organic compounds (PFCs), hexachloro cyclohexane (PCN), kaempferia galamga, pentachlorobenzene, short-chain chlorinated paraffin, and the like.
Due to the discharge of three wastes in the urban industry, the use of a large amount of chemical pesticides, the discharge of traffic tail gas and the incineration of urban garbage, a large amount of persistent organic pollutants enter the soil and enter the human body through a plant-soil system, thereby causing serious influence and great harm to the health of the human body. POPs enter the human body through various routes such as the skin and respiratory tract, and accumulate in adipose tissues and organs such as the liver and kidney. POPs have the effects of causing aberration, mutation and carcinogenesis, and can also damage the endocrine system and the nervous system, thereby causing malformation of newborn infants, premature puberty, damage to the immune system, breast cancer, malformation and pathological changes of male reproductive organs and the like. Therefore, the soil polluted by persistent organic matters must be repaired, and a great number of reports are available.
At present, the common restoration methods for POPs in soil mainly comprise a physical method (an adsorption method, an extraction method, a cement kiln technology, safe landfill and the like), a chemical method (a wet oxidation method, a supercritical water oxidation method, a photocatalytic oxidation method and the like), a biological method (phytoremediation, microbial remediation and animal remediation) and a thermal incineration method. However, the physical method only plays a role in temporary transfer, the chemical method consumes a large amount of chemical reagents and causes secondary pollution, the bioremediation has high selectivity to microorganisms and takes a long time, and the thermal incineration method generates dioxin with higher toxicity if the thermal incineration method is not properly treated.
The low-temperature plasma oxidation technology is characterized in that high-energy electrons generated in a discharge area collide with atoms, molecules and ions under the action of a strong electric field to form excited molecules (such as N)2 *、O2 *) And active substances (e.g.. OH, O)3，H2O2). The high oxidation potential active substances and the ultraviolet radiation and shock waves generated by discharge perform a series of oxidation-reduction reactions with pollutants at extremely high reaction rates to decompose the pollutants into small molecular intermediate products and further into CO2And H2And O, finally completely degrading the pollutants. Dielectric barrier discharge is a common low-temperature plasma discharge mode under atmospheric pressure for inserting insulating dielectric into a discharge space, can generate a uniform and stable plasma region, and is most widely applied to soil remediation.
Chinese patent publication No. CN103272839A discloses a low-temperature plasma processing apparatus for persistent organic pollutants in soil, which includes a low-temperature plasma power supply, two stainless steel discharge electrodes, a reaction kettle and an external cooling fan; the reaction kettle is arranged between the high-voltage electrode and the grounding electrode.
Chinese patent publication No. CN206415415U discloses a device for treating persistent organic matter contaminated soil by using low-temperature plasma, which comprises a low-temperature plasma high-voltage power supply, a reactor, a rotating rod, an air extraction opening and an air inlet; the reactor is driven to rotate by an external driving device through a rotating rod, and the polluted soil is tumbled up and down in the reactor.
The low-temperature plasma device has the advantages of simple operation and high pollutant removal efficiency, but is not suitable for large-scale treatment of repairing persistent organic polluted soil.
Disclosure of Invention
The invention provides a fluidized bed type device for treating organic matter contaminated soil, which can degrade POPs in the soil by using active components generated by discharge and can provide technical support for repairing the contaminated soil.
A fluidized bed type device for treating organic matter contaminated soil comprises a fluidized bed and a cyclone separator, wherein the fluidized bed comprises a fluidized bed cavity, a fluidized bed top cover arranged at the upper part of the fluidized bed cavity and a feeding bin arranged at the bottom of the fluidized bed cavity; a plurality of DBD reaction tubes are arranged in the fluidized bed cavity in an array mode, and the DBD reaction tubes are parallel to a vertical airflow channel in the fluidized bed cavity; the top cover of the fluidized bed is connected with a low-temperature plasma high-voltage power supply connected with the DBD reaction tube;
the feed inlet of the cyclone separator is connected with an air outlet arranged on the top cover of the fluidized bed; the lateral wall in feeding storehouse is equipped with soil feed inlet and secondary feed inlet, cyclone's discharge gate is connected with the secondary feed inlet.
In the invention, the fluidized bed cavity is used for carrying out a series of reactions between soil and low-temperature plasma, and the cyclone separator is used for separating the soil entrained in the waste gas; the soil to be treated enters the feeding bin from the feeding hole; and the soil after gas-solid separation enters the feeding bin through a secondary feeding hole connected with the discharge hole of the cyclone separator.
In a specific application process, the treatment object may be soil, but is not limited to soil, and may be other particulate matters, dust and the like.
Further, the low-temperature plasma high-voltage power supply can adopt a unipolar pulse high-voltage power supply, a bipolar pulse high-voltage power supply or an alternating-current high-voltage power supply.
Preferably, the fluidized bed cavity is a barrel-shaped container, and the barrel wall of the fluidized bed cavity is made of stainless steel materials. DBD reaction tubes and supports distributed in an array are arranged in the fluidized bed cavity, and the DBD reaction tubes distributed in the array are fixed in the fluidized bed cavity by the supports.
Furthermore, the DBD reaction tube consists of a high-voltage electrode, an insulating medium and a low-voltage electrode which are coaxially arranged; the high-voltage electrodes are arranged inside the insulating medium, and the low-voltage electrodes are uniformly distributed on the periphery of the insulating medium in a hexagonal shape.
Further, the high-voltage electrode and the low-voltage electrode are made of metal materials, but stainless steel materials are not limited to stainless steel materials, and the insulating medium is made of high-performance ceramic medium.
Further, the ceramic medium has a thickness of 8mm, a length of 100cm and an inner diameter of 8cm, and the average power of a single DBD reaction tube is 3-5 kW.
Further, the bottom of feeding storehouse is equipped with the storage silo, is equipped with detachable stainless steel filter screen between feeding storehouse and the storage silo. The stainless steel filter screen can be drawn out, and the treated soil is dropped into the storage bin.
Further, the bottom of the storage bin is provided with an air inlet, and the side wall of the storage bin is provided with a storage bin discharge hole.
Further, the air inlet of the storage bin is connected with a fan and used for blowing the soil in the feeding bin to the cavity of the fluidized bed for reaction.
The device of the invention can lead soil particles to flow in the DBD reactor and to be fully contacted with plasma, thereby leading POPs to be rapidly oxidized and degraded. The invention organically combines the advantage of high plasma free radical activity with the advantage of good mass transfer effect of the fluidized bed, greatly improves the reaction speed and efficiency, and is suitable for the industrialized large-scale remediation of the persistent organic matter polluted soil.
Drawings
FIG. 1 is a schematic view of the overall structure of a fluidized bed type apparatus for treating organic-contaminated soil according to the present invention;
fig. 2 is a schematic structural view of the DBD reaction tube in fig. 1.
In the figure: 1-low-temperature plasma high-voltage power supply, 2-fluidized bed top cover, 3-gas outlet, 4-fluidized bed cavity, 5-support, 6-DBD reaction tube, 61-high-voltage electrode, 62-insulating medium, 63-low-voltage electrode, 7-feeding bin, 8-cyclone separator, 81-feeding port, 82-discharging port, 83-gas outlet, 9-soil feeding port, 10-secondary feeding port, 11-stainless steel filter screen, 12-storage bin, 13-storage bin discharging port and 14-gas inlet.
Detailed Description
The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.
As shown in FIG. 1, an apparatus for treating organic matter-contaminated soil in a fluidized bed type comprises a fluidized bed and a cyclone 8; the fluidized bed comprises a fluidized bed cavity 4, a fluidized bed top cover 2 arranged on the upper part of the fluidized bed cavity 4 and a feeding bin 7 arranged at the bottom of the fluidized bed cavity 4. A plurality of DBD reaction tubes 6 which are arranged in an array are arranged in the fluidized bed cavity 4, and the DBD reaction tubes 6 are parallel to a vertical airflow channel in the fluidized bed cavity 4.
The fluidized bed top cover 2 is connected with a low-temperature plasma high-voltage power supply 1 connected with a DBD reaction tube 6. The low-temperature plasma high-voltage power supply 1 is used for generating plasma, and a single (double) polarity pulse high-voltage power supply or an alternating-current high-voltage power supply can be adopted.
The side wall of the fluidized bed top cover 2 is provided with an air outlet 3 which can be connected with a feed inlet 81 of the cyclone separator 8.
The fluidized bed cavity 4 is a barrel-shaped container, the wall of the fluidized bed cavity is made of stainless steel materials, the DBD reaction tubes 6 and the supports 5 which are distributed in an array form are arranged in the fluidized bed cavity 4, and the DBD reaction tubes 6 distributed in the array form are fixed in the fluidized bed cavity 4 by the supports 5.
The feed inlet 81 of the cyclone separator is connected with the gas outlet 3 of the fluidized bed top cover 2, so that soil entrained in the waste gas is separated, soil particles with large particle size can settle down, the soil particles enter the secondary feed inlet 10 through the discharge hole 82 of the cyclone separator 8, and clean gas is discharged from the gas outlet 83 of the cyclone separator 8.
A soil feeding port 9 and a secondary feeding port 10 are respectively arranged at two sides of the feeding bin 7; the soil to be treated enters the feeding bin 7 from the soil feeding hole 9, and the soil after gas-solid separation enters the feeding bin 7 through the secondary feeding hole 10 connected with the discharging hole 82.
The bottom of the feeding bin 7 is provided with a movable stainless steel filter screen 11, the stainless steel filter screen 11 can be drawn out, and the treated soil is dropped into a storage bin 12. The storage bin 12 is arranged below the feeding bin 7, a discharge hole 13 is arranged on one side of the storage bin 12, and an air inlet 14 is arranged at the bottom of the storage bin. The air inlet 14 is connected with a fan, and the air blows the soil to a fluidized state to react after passing through the stainless steel filter screen 11.
As shown in fig. 2, the DBD reaction tube 6 is composed of a high voltage electrode 61, an insulating medium 62, and a low voltage electrode 63. The high-voltage electrode 61 is a star-shaped stainless steel electrode, the insulating medium 62 is a high-performance ceramic medium, and the low-voltage electrode 63 is a sawtooth stainless steel electrode which is uniformly distributed around the insulating medium 62 in a hexagon shape.
Further, the insulating medium 62 has a thickness of 8mm, a length of 100cm, an inner diameter of about 8cm, and an average power of 3 to 5kW for a single ceramic tube.
The working process of the invention is as follows:
firstly, soil to be treated enters a feeding bin 7 from a soil feeding hole 9, then air is blown into a fluidized bed cavity 4 through an air inlet 14, the air blows the soil to a fluidized state after passing through a stainless steel filter screen 11, and the soil enters a DBD reaction tube 6 for plasma reaction. Wherein, the high voltage electrode 61 is connected with the low temperature plasma high voltage power supply 1, and the low voltage electrode 63 is grounded. Then, the waste gas after the reaction is discharged through the gas outlet 3 of the fluidized bed reactor, is connected with the feed inlet 81 and enters the cyclone separator 8, soil particles with large particle size can be settled, enters the secondary feed inlet 10 through the discharge outlet 82 of the cyclone separator, the soil brought out by the waste gas is recovered into the feed bin 7 again, and clean gas is discharged from the gas outlet 83 of the cyclone separator 8; finally, the stainless steel screen 11 is removed and the treated soil is lowered into the storage bin 12 and discharged through the discharge port 13.
The embodiments described above are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions and equivalents made within the scope of the principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A fluidized bed type device for treating organic matter contaminated soil comprises a fluidized bed and a cyclone separator, and is characterized in that the fluidized bed comprises a fluidized bed cavity, a fluidized bed top cover arranged on the upper part of the fluidized bed cavity and a feeding bin arranged at the bottom of the fluidized bed cavity; a plurality of DBD reaction tubes are arranged in the fluidized bed cavity in an array mode, and the DBD reaction tubes are parallel to the airflow channel in the fluidized bed cavity; the top cover of the fluidized bed is connected with a low-temperature plasma high-voltage power supply connected with the DBD reaction tube;
the feed inlet of the cyclone separator is connected with an air outlet arranged on the top cover of the fluidized bed; the lateral wall in feeding storehouse is equipped with soil feed inlet and secondary feed inlet, cyclone's discharge gate is connected with the secondary feed inlet.
2. The apparatus for fluidized-bed treatment of organic-contaminated soil according to claim 1, wherein said low-temperature plasma high-voltage power supply is a unipolar pulse high-voltage power supply, a bipolar pulse high-voltage power supply or an ac high-voltage power supply.
3. The apparatus for fluidized bed treatment of organic contaminated soil according to claim 1, wherein said fluidized bed chamber is a bucket-shaped vessel, and the wall of said vessel is made of stainless steel.
4. The apparatus for fluidized-bed treatment of organic-contaminated soil according to claim 1, wherein said DBD reaction tube is composed of a high voltage electrode, an insulating medium and a low voltage electrode which are coaxially disposed; the high-voltage electrodes are arranged inside the insulating medium, and the low-voltage electrodes are uniformly distributed on the periphery of the insulating medium in a hexagonal shape.
5. The apparatus for fluidized-bed treatment of organic-contaminated soil according to claim 4, wherein said high-voltage electrode and said low-voltage electrode are made of metal material, and said insulating medium is made of ceramic medium.
6. The apparatus for fluidized-bed treatment of organic-contaminated soil according to claim 5, wherein said ceramic media has a thickness of 8mm, a length of 100cm, an inner diameter of 8cm, and an average power of a single DBD reaction tube of 3-5 kW.
7. The apparatus for fluidized bed type treatment of organic contaminated soil according to claim 1, wherein a storage bin is provided at the bottom of the feeding bin, and a detachable stainless steel screen is provided between the feeding bin and the storage bin.
8. The apparatus for fluidized bed treatment of organic contaminated soil according to claim 7, wherein said storage bin has an air inlet at the bottom and a discharge outlet at the side wall.
9. The apparatus for fluidized bed type treatment of organic contaminated soil according to claim 8, wherein the air inlet of the storage bin is connected to a blower for blowing the soil in the feeding bin to the fluidized bed chamber for reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011288574.5A CN112355046A (en) | 2020-11-17 | 2020-11-17 | Fluidized bed type device for treating organic matter contaminated soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011288574.5A CN112355046A (en) | 2020-11-17 | 2020-11-17 | Fluidized bed type device for treating organic matter contaminated soil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114472489A (en) * | 2022-02-28 | 2022-05-13 | 张向 | Soil purification treatment device for ecological restoration |
| CN114789190A (en) * | 2022-04-12 | 2022-07-26 | 浙江大学 | Fluidized plasma restores soil device |
| CN114789191A (en) * | 2022-04-12 | 2022-07-26 | 浙江大学 | System for repairing organic contaminated soil by fluidized discharge plasma |
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