CN112108512A - Organic contaminated soil remediation device and method based on regenerative tail gas desorption auxiliary agent - Google Patents
Organic contaminated soil remediation device and method based on regenerative tail gas desorption auxiliary agent Download PDFInfo
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- CN112108512A CN112108512A CN202010929704.2A CN202010929704A CN112108512A CN 112108512 A CN112108512 A CN 112108512A CN 202010929704 A CN202010929704 A CN 202010929704A CN 112108512 A CN112108512 A CN 112108512A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/0056—Other disintegrating devices or methods specially adapted for specific materials not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses an organic contaminated soil remediation device and method based on a regenerative tail gas desorption auxiliary agent, which comprises a device shell, a soil screening component, a heating component and an adsorption component, wherein the device shell is provided with a feed hopper and an induced draft fan, the soil screening component comprises a screening motor, the device comprises a screening plate and a vibrating screen, wherein the screening plate is arranged in a device shell through a first lead screw, a screening motor provides power for the first lead screw, the vibrating screen is arranged at the lower end of the screening plate, a heating assembly comprises a heating sleeve, a soil stirring plate and a stirring motor, the heating sleeve is arranged at the bottom in the device shell, the soil stirring plate is arranged in the heating sleeve, the stirring motor provides power for the soil stirring plate, an adsorption assembly comprises an air homogenizing plate and a scraper, the air homogenizing plate is arranged in the device shell, the upper end of the air homogenizing plate is filled with a tail gas desorption auxiliary agent, the scraper is clamped in the device shell, and the scraper motor provides power for the scraper; the invention has reasonable structural design, high treatment efficiency and low energy consumption, and is suitable for mass popularization.
Description
Technical Field
The invention relates to the technical field of soil remediation equipment, in particular to an organic contaminated soil remediation device and method based on a regenerative tail gas desorption auxiliary agent.
Background
In recent years, the problem of organic pollution of soil in China is increasingly highlighted, a large amount of soil is polluted by organic pollutants such as benzene, toluene, xylene, ethylbenzene, TPH and the like, serious threats are formed to ecological environment, food safety and human health, and along with the gradual understanding of public on the environment and health hazards of the organic pollutants, economic and effective methods for treating the toxic substances are urgently needed. The main organic pollutant polluted soil remediation technologies include biological remediation, chemical remediation, physical remediation and the like, and in comparison, the physical remediation or the chemical remediation have wider applicability and are particularly suitable for high-concentration and multi-component organic polluted sites. Among them, the soil thermal desorption technique is one of the most direct and effective methods for remedying the organic contaminated soil.
However, the existing thermal desorption device for soil remediation often has the following defects in the using process: 1. the polluted soil is heated unevenly, and organic pollutants are difficult to desorb; 2. the organic gas is not thoroughly treated, and secondary pollution is easy to generate; 3. the utilization rate of the adsorbent is low, and the soil treatment cost is high.
Disclosure of Invention
Aiming at the technical problems, the invention provides a device and a method for treating organic contaminated soil based on a regenerative tail gas desorption auxiliary agent, which have low energy consumption and high efficiency.
The technical scheme of the invention is as follows: the organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary comprises a device shell, a soil screening component, a heating component and an adsorption component, wherein an adsorption cavity, a screening cavity and a heating cavity are sequentially arranged in the device shell from top to bottom; the soil screening component comprises a screening motor, a screening plate and a vibrating screen, wherein two first lead screws are horizontally arranged in the screening cavity, the end parts of the two first lead screws penetrate through the screening cavity and are provided with first driven belt wheels, scraping teeth are arranged at the lower end of the screening plate, the two ends of the screening plate are respectively in threaded connection with the two first lead screws through threaded blocks, the screening motor is fixedly arranged on the outer wall of a shell of the device, a first main belt wheel is arranged on an output shaft of the screening motor, the first main belt wheel and the first driven belt wheel are in belt transmission, the vibrating screen is movably clamped at the bottom end of the inner part of the screening cavity, the lower end of the vibrating screen is movably clamped with a cam shaft, the end part of the cam shaft penetrates through the screening cavity and is provided with a connecting belt wheel, and the connecting belt wheel is; the heating assembly comprises a heating sleeve, a soil stirring plate and a stirring motor, the heating sleeve is arranged at the bottom end in the heating cavity, an installation block is arranged in the heating sleeve, the soil stirring plate is rotationally clamped on the installation block, and the stirring motor is fixedly arranged on the outer wall of the device shell and provides power for the soil stirring plate; the adsorption component comprises an air homogenizing plate and a scraper, the air homogenizing plate is arranged at the bottom end of the inner part of the adsorption cavity, a tail gas desorption auxiliary agent is filled at the upper end of the air homogenizing plate, the scraper is movably clamped at the upper end of the inner part of the adsorption cavity, a scraper motor is arranged on the outer wall of the device shell, and the scraper motor provides power for the scraper.
Further, the screening board is provided with two, the tip of two screening boards all pegs graft with the activity of screw thread piece through the inserted bar, two screening boards are parallel to each other and are close to, the inside activity joint of screw thread piece has two ratchets, two ratchet fixed connection, and equal sliding clamping connects on first lead screw, two ratchets correspond with the position of two inserted bars, and the ratchet on two ratchets is crisscross each other, during the use, under the effect of ratchet, make two screening boards crisscross removal each other, carry out broken screening to soil, make the soil granule more become more meticulous, be favorable to improving follow-up soil heating efficiency, reduce the device energy consumption.
Furthermore, 4-8 heating regions are arranged inside the heating sleeve, an installation block is arranged inside each heating region, two soil turning and stirring plates are arranged on each installation block in parallel from top to bottom, the two soil turning and stirring plates are in transmission through a gear and a chain, a device cavity is arranged at the bottom end inside the shell of the device, two rotating shafts are horizontally arranged inside the device cavity, the two rotating shafts are in transmission through the gear and the chain respectively with the soil turning and stirring plates at the lower ends of the installation blocks, a turning and stirring motor provides power for one of the rotating shafts, the heating regions are arranged, the soil turning and stirring plates are arranged in the heating regions, the heating uniformity of the polluted soil can be obviously improved, and the heating efficiency is improved.
Further, vibrating screen border department all is provided with the movable sleeve, and screening intracavity portion bottom sets up the slide bar, and the movable sleeve is established on the slide bar, and is provided with reset spring on the slide bar for vibrating screen is more steady at the vibration in-process, is favorable to improving vibrating screen's job stabilization nature, has reduced the noise that improves vibrating screen simultaneously, makes this device environmental protection more practical.
Furthermore, the number of the scrapers is 6-10, the two scrapers form a group, 4 second lead screws are horizontally arranged in the adsorption cavity, the two second lead screws respectively penetrate through one side of the adsorption cavity, the two second lead screws are respectively provided with a second driven belt pulley, the two second lead screws respectively penetrate through the other side of the adsorption cavity, the other two second lead screws are respectively provided with a second driven belt pulley, the other two second lead screws are respectively in threaded connection with the scrapers close to the other side of the adsorption cavity, the two scraper motors are provided with two scraper motors, the output shafts of the two scraper motors are respectively provided with a second main belt pulley, the second main belt pulleys are respectively in belt transmission with the two second driven belt pulleys on the same side, the tail gas desorption auxiliary agents can be stirred by arranging the two groups of the scrapers which move in a reciprocating mode, and the adsorption performance of the tail.
Further, the scraper blade lower extreme is provided with tooth, is provided with the guiding hole on the scraper blade, and the guiding hole is located tooth upper end, through setting up tooth and guiding hole for the scraper blade removes the in-process, and the tail gas desorption auxiliary agent of scraping passes from the guiding hole, avoids tail gas desorption auxiliary agent to gather the integrated heap.
Further, the tail gas desorption auxiliary agent adopts an active alumina auxiliary agent taking a ceramic raschig ring as a carrier, and the preparation method comprises the following steps: impregnating a ceramic Raschig ring carrier with an aluminum nitrate solution, standing at room temperature for 1-3 h, drying at 30-60 ℃ for 8-15 h, and calcining at 150-300 ℃ for 0.5-2 h in an inert atmosphere to obtain an activated alumina auxiliary agent with the ceramic Raschig ring as the carrier; the tail gas desorption auxiliary agent prepared by the invention utilizes the porosity of the ceramic Raschig ring carrier to adsorb organic gas, and utilizes the active alumina to oxidize and decompose organic matters, and can be continuously used after desorption, thereby reducing the soil treatment cost.
The organic contaminated soil remediation method based on the regenerative tail gas desorption auxiliary agent comprises the following steps:
s1, supplying power to the induced draft fan, the screening motor, the heating sleeve, the stirring motor and the scraper motor through an external power supply respectively;
s2, putting the organic contaminated soil into a screening cavity through a feed hopper, driving two first lead screws to rotate in a reciprocating manner by a screening motor, enabling two screening plates to be in the screening cavity, enabling scraping teeth on the two screening plates to move in a staggered manner by a vibrating screen, further crushing the soil, continuously vibrating the vibrating screen under the action of a screening motor and a cam shaft after crushed soil particles fall onto the vibrating screen, screening the soil, enabling the screened soil to fall into a heating cavity, and discharging impurities in the soil through a box door;
s3, after the soil particles enter the heating cavity, the soil particles fall into each heating area, the screening cavity and the heating cavity are isolated by the movable inserting plate, the soil is heated by the heating sleeve, and meanwhile, the soil stirring plate is driven by the stirring motor to stir, so that the soil is beneficial to full heating, organic pollutants in the soil are converted into gas and enter the adsorption cavity through a pipeline;
s4, the organic gas that gets into in attaching the chamber at first passes through even gas board then, then pass tail gas desorption auxiliary agent under the effect of draught fan, organic matter in the gas is held back the back eduction gear shell by tail gas desorption auxiliary agent, adsorb the processing procedure, utilize scraper blade motor to drive two sets of scraper blade reciprocating motion, utilize the tooth on the scraper blade motor to constantly scrape tail gas desorption auxiliary agent, be favorable to the make full use of tail gas desorption auxiliary agent, soil after the thermal desorption is handled is discharged through unloading the bin gate, tail gas desorption auxiliary agent is through reuse behind high temperature desorption simultaneously.
Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable structural design, and during the organic pollution thermal desorption treatment process, firstly, the soil is crushed and sieved, so that the energy consumption of subsequent soil heating is reduced, the load of the device is also reduced, and the practicability of the device is improved; the heating areas are arranged in the heating sleeve, so that the soil is heated more uniformly, the heating dead angle is reduced, organic pollutants in the soil can escape sufficiently, and the treatment effect of the organic polluted soil is improved; the gas homogenizing plate is arranged, so that the tail gas desorption auxiliary agent is more uniform, the utilization rate of the tail gas desorption auxiliary agent is improved, and meanwhile, the tail gas desorption auxiliary agent can be repeatedly utilized after being eluted at high temperature, and the treatment cost of the organic contaminated soil is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a right side view of the present invention;
FIG. 3 is a schematic illustration of the attachment of the soil screening assembly of the present invention to the housing of the apparatus;
FIG. 4 is a schematic view of the ratchet wheel of the present invention in connection with a sifting plate;
FIG. 5 is a schematic view of the connection of the ratchet of the present invention to the first lead screw;
FIG. 6 is a schematic view of the internal structure of the heating jacket of the present invention;
FIG. 7 is a schematic view of the attachment of a second lead screw of the flight of the present invention;
wherein, 1-device shell, 10-adsorption cavity, 11-screening cavity, 110-box door, 12-heating cavity, 120-discharge door, 13-feed hopper, 14-induced draft fan, 15-pipeline, 16-movable inserting plate, 17-device cavity, 170-rotating shaft, 2-soil screening component, 20-screening motor, 200-first lead screw, 201-first driven pulley, 202-first main pulley, 21-screening plate, 210-scraping tooth, 211-thread block, 212-inserting rod, 213-ratchet wheel, 22-vibrating screen, 220-cam shaft, 221-connecting pulley, 222-movable sleeve, 223-sliding rod, 224-reset spring, 3-heating component, 30-heating sleeve, 300-mounting block, 301-heating area, 31-soil stirring plate, 32-stirring motor, 4-adsorption component, 40-gas homogenizing plate, 42-scraper, 420-scraper motor, 421-second screw rod, 422-second driven pulley, 423-second main pulley, 424-tooth and 425-guide hole.
Detailed Description
Example 1: the organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent, as shown in fig. 1 and 2, comprises a device shell 1, a soil screening component 2, a heating component 3 and an adsorption component 4; an adsorption cavity 10, a screening cavity 11 and a heating cavity 12 are sequentially arranged in the device shell 1 from top to bottom, a feed hopper 13 and an induced draft fan 14 are arranged on the outer wall of the device shell 1, the feed hopper 13 is communicated with the screening cavity 11, the induced draft fan 14 is positioned at the top end of the device shell and is communicated with the adsorption cavity 10, the adsorption cavity 10 is connected with the heating cavity 12 through a pipeline 15, a movable inserting plate 16 is arranged between the screening cavity 11 and the heating cavity 12, a box door 110 is movably hinged on the screening cavity 11, and a discharge door 120 is movably hinged on the heating cavity 12;
as shown in fig. 1, 2, 3, 4 and 5, the soil screening assembly 2 includes a screening motor 20, a screening plate 21 and a vibrating screen 22, two first lead screws 200 are horizontally arranged inside the screening chamber 11, the ends of the two first lead screws 200 both penetrate through the screening chamber 11, and is provided with a first driven belt wheel 201, the lower end of the sieving plate 21 is provided with scraping teeth 210, the two ends of the sieving plate 21 are respectively in threaded connection with two first lead screws 200 through threaded blocks 211, the sieving motor 20 is fixedly arranged on the outer wall of the device shell 1, and the output shaft of the screening motor 20 is provided with a first main belt wheel 202, the first main belt wheel 202 and a first driven belt wheel 201 are driven by a belt, the vibrating screen 22 is movably clamped at the bottom end inside the screening cavity 11, the lower end of the vibrating screen 22 is movably clamped with a cam shaft 220, the end part of the cam shaft 220 penetrates through the screening cavity 11, a connecting belt wheel 221 is arranged, and the connecting belt wheel 221 is in transmission with the first main belt wheel 202 through a belt; the screening plates 21 are provided with two screening plates 21, the end parts of the two screening plates 21 are movably inserted into the thread block 211 through the insertion rods 212, the two screening plates 21 are parallel to each other and close to each other, the two ratchet wheels 213 are movably clamped inside the thread block 211, the two ratchet wheels 213 are fixedly connected and are all slidably clamped on the first screw rod 200, the two ratchet wheels 213 correspond to the two insertion rods 212, and the ratchets on the two ratchet wheels 213 are staggered with each other; the movable sleeve 222 is arranged at the edge of the vibrating screen 22, the sliding rod 223 is arranged at the bottom end inside the screening cavity 11, the movable sleeve 222 is movably sleeved on the sliding rod 223, the sliding rod 223 is provided with the reset spring 224, and the sliding rod 223 are arranged, so that the vibrating screen 22 is more stable in the vibrating process, the working stability of the vibrating screen 22 is improved, the noise of the vibrating screen 22 is reduced, and the device is more environment-friendly and practical;
as shown in fig. 1 and 6, the heating assembly 3 includes a heating jacket 30, a soil stirring plate 31 and a stirring motor 32, the heating jacket 30 is disposed at the bottom end inside the heating cavity 12, an installation block 300 is disposed inside the heating jacket 30, the soil stirring plate 31 is rotatably clamped on the installation block 300, and the stirring motor 32 is fixedly disposed on the outer wall of the device housing 1 and provides power for the soil stirring plate 31; the heating sleeve 30 is internally provided with 8 heating areas 301, each heating area 301 is internally provided with a mounting block 300, each mounting block 300 is provided with two soil stirring plates 31 which are arranged side by side up and down, the two soil stirring plates 31 are in transmission through a gear and a chain, the bottom end inside the device shell 1 is provided with a device cavity 17, the inside of the device cavity 17 is horizontally provided with two rotating shafts 170, the two rotating shafts 170 are in transmission through the gear and the chain, the two rotating shafts 170 are respectively in transmission through the gear and the chain with the soil stirring plates 31 at the lower ends of the mounting blocks 300, a stirring motor 32 provides power for one rotating shaft 170, and by arranging the heating areas 301 and arranging the soil stirring plates 31 in each heating area 301, the heating uniformity of polluted soil can be obviously improved, and the heating efficiency is improved;
as shown in fig. 1, 2 and 7, the adsorption component 4 includes an air homogenizing plate 40 and a scraper 42, the air homogenizing plate 40 is disposed at the bottom end inside the adsorption cavity 10, the upper end of the air homogenizing plate 40 is filled with a tail gas desorption auxiliary agent, the tail gas desorption auxiliary agent is a commercially available activated carbon adsorbent, the scraper 42 is movably clamped at the upper end inside the adsorption cavity 40, a scraper motor 420 is disposed on the outer wall of the device housing 1, and the scraper motor 420 provides power for the scraper 42; the number of the scrapers 42 is 8, two scrapers 42 are a group, 4 second lead screws 421 are horizontally arranged in the adsorption cavity 40, two of the second lead screws 421 respectively penetrate one side of the adsorption cavity 40, two second driven pulleys 422 are respectively arranged on the two second lead screws 421, the two second lead screws 421 are respectively in threaded connection with the scrapers 42 close to one side of the adsorption cavity 40, the other two second lead screws 421 respectively penetrate the other side of the adsorption cavity 40, the other two second lead screws 421 are respectively provided with second driven pulleys 422, the other two second lead screws 421 are respectively in threaded connection with the scrapers 42 close to the other side of the adsorption cavity 40, two scraper motors 420 are respectively arranged, the output shafts of the two scraper motors 420 are respectively provided with second main pulleys 423, the second main pulleys 423 are respectively in belt transmission with the two second driven pulleys 422 on the same side, and by arranging two groups of scrapers 42 which move in a reciprocating manner, the tail gas desorption auxiliary agent can be stirred, and the adsorption performance of the tail gas desorption auxiliary agent is fully utilized; the lower end of the scraper 42 is provided with teeth 424, the scraper 42 is provided with guide holes 425, the guide holes 425 are located at the upper ends of the teeth 424, and the teeth 424 and the guide holes 425 are arranged, so that in the moving process of the scraper 42, the scraped thermal desorption auxiliary 41 passes through the guide holes 425, the tail gas desorption auxiliary is prevented from being accumulated, and the induced draft fan 14, the screening motor 20, the heating sleeve 30, the stirring motor 32 and the scraper motor 420 are all commercially available products.
The method for repairing the organic contaminated soil by using the device of the embodiment comprises the following steps:
s1, supplying power to the induced draft fan 14, the screening motor 20, the heating jacket 30, the stirring motor 32 and the scraper motor 420 through an external power supply respectively;
s2, putting the organic contaminated soil into the screening cavity 11 through the feed hopper 13, driving the two first lead screws 200 to rotate in a reciprocating manner by the screening motor 20, enabling the two screening plates 21 to move in the screening cavity 11 and to be located at the upper end of the vibrating screen 22 to move in a reciprocating manner, crushing the organic contaminated soil, enabling the scraping teeth 210 on the two screening plates 21 to move in a mutually staggered manner by utilizing the ratchet wheel 213, further crushing the soil, enabling the crushed soil particles to fall onto the vibrating screen 22, continuously vibrating the vibrating screen 22 under the action of the screening motor 20 and the cam shaft 220, screening the soil, enabling the screened soil to fall into the heating cavity 12, and discharging impurities in the soil through the box door 110;
s3, after entering the heating cavity 12, soil particles fall into each heating area 301, the screening cavity 11 and the heating cavity 12 are isolated by the movable inserting plate 16, the soil is heated by the heating sleeve 30, and meanwhile, the soil stirring plate 31 is driven by the stirring motor 32 to stir, so that sufficient heating is facilitated, organic pollutants in the soil are converted into gas and enter the adsorption cavity 10 through the pipeline 15;
s4, the organic gas entering the auxiliary cavity 10 firstly passes through the gas homogenizing plate 40 and then passes through the tail gas desorption auxiliary agent under the action of the induced draft fan 14, organic matters in the gas are intercepted by the tail gas desorption auxiliary agent and then are discharged from the device shell 1, in the adsorption treatment process, the scraper motor 420 is utilized to drive the two groups of scrapers 42 to reciprocate, the teeth 424 on the scraper motor 420 are utilized to continuously scrape the tail gas desorption auxiliary agent, the full utilization of the tail gas desorption auxiliary agent is facilitated, the soil after the thermal desorption treatment is discharged through the discharge door 120, and meanwhile, the tail gas desorption auxiliary agent is repeatedly utilized after being desorbed at a high temperature.
Example 2: the present embodiment is substantially the same as embodiment 1, except that the tail gas desorption auxiliary agent is an activated alumina auxiliary agent using a ceramic raschig ring as a carrier, and the preparation method thereof is as follows: and (3) impregnating the ceramic raschig ring carrier with an aluminum nitrate solution, standing at room temperature for 2 hours, drying at 50 ℃ for 12 hours, and finally calcining at 245 ℃ for 1.6 hours in an inert atmosphere to obtain the activated alumina auxiliary agent taking the ceramic raschig ring as the carrier.
Experimental example: the organic contaminated soil in a certain area is respectively repaired by using the devices of the above embodiment 1 and embodiment 2, and the organic matter content of the repaired soil is shown in table 1:
table 1: under the condition of different tail gas desorption auxiliary agents, the organic matter in the soil is removed;
| examples | Benzene removal rate/%) | Xylene removal rate/%) | Phenol removal rate/%) | Degree of removal of hydroquinone/%) |
| 1 | 72 | 79 | 80 | 69 |
| 2 | 90 | 89 | 93 | 91 |
As can be seen from the table 1, the device of the embodiment 2 can be used for repairing and treating the organic contaminated soil, so that the organic pollutants in the soil can be basically and completely removed, the soil treatment efficiency is greatly improved, and the soil repairing and treating cost is further reduced.
Claims (9)
1. An organic contaminated soil remediation device based on a regenerative tail gas desorption auxiliary agent is characterized by comprising a device shell (1), a soil screening component (2), a heating component (3) and an adsorption component (4), the device is characterized in that an adsorption cavity (10), a screening cavity (11) and a heating cavity (12) are sequentially arranged in the device shell (1) from top to bottom, a feed hopper (13) and an induced draft fan (14) are arranged on the outer wall of the device shell (1), the feed hopper (13) is communicated with the screening cavity (11), the draught fan (14) is positioned at the top end of the device shell (1), and is communicated with the adsorption cavity (10), the adsorption cavity (10) is connected with the heating cavity (12) through a pipeline (15), a movable inserting plate (16) is arranged between the screening cavity (11) and the heating cavity (12), a box door (110) is movably hinged on the screening cavity (11), and a discharging door (120) is movably hinged on the heating cavity (12); the soil screening assembly (2) comprises a screening motor (20), a screening plate (21) and a vibrating screen (22), two first lead screws (200) are horizontally arranged in a screening cavity (11), the end parts of the two first lead screws (200) penetrate through the screening cavity (11) and are provided with first driven belt wheels (201), scraping teeth (210) are arranged at the lower end of the screening plate (21), the two ends of the screening plate (21) are respectively in threaded connection with the two first lead screws (200) through threaded blocks (211), the screening motor (20) is fixedly arranged on the outer wall of a device shell (1), a first main belt wheel (202) is arranged on an output shaft of the screening motor (20), the first main belt wheel (202) and the first driven belt wheels (201) are in belt transmission, and the vibrating screen (22) is movably clamped at the bottom end inside the screening cavity (11), the lower end of the vibrating screen (22) is movably clamped with a cam shaft (220), the end part of the cam shaft (220) penetrates through the screening cavity (11) and is provided with a connecting belt wheel (221), and the connecting belt wheel (221) is in transmission with the first main belt wheel (202) through a belt; the heating assembly (3) comprises a heating sleeve (30), a soil stirring plate (31) and a stirring motor (32), the heating sleeve (30) is arranged at the bottom end inside the heating cavity (12), an installation block (300) is arranged inside the heating sleeve (30), the soil stirring plate (31) is rotatably clamped on the installation block (300), and the stirring motor (32) is fixedly arranged on the outer wall of the device shell (1) and provides power for the soil stirring plate (31); adsorption component (4) are including even gas board (40) and scraper blade (42), even gas board (40) set up in the inside bottom in absorption chamber (10), and even gas board (40) upper end is filled there is tail gas desorption auxiliary agent, scraper blade (42) activity joint is in the inside upper end in absorption chamber (40), is provided with scraper motor (420) on device shell (1) outer wall, scraper motor (420) provide power for scraper blade (42).
2. The organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent as claimed in claim 1, wherein the number of the screening plates (21) is two, the ends of the two screening plates (21) are movably inserted into the screw block (211) through the insertion rod (212), the two screening plates (21) are parallel to and close to each other, the screw block (211) is movably clamped with two ratchet wheels (213), the two ratchet wheels (213) are fixedly connected and are both slidably clamped on the first lead screw (200), the two ratchet wheels (213) correspond to the two insertion rods (212), and the ratchet teeth on the two ratchet wheels (213) are staggered with each other.
3. The organic contaminated soil remediation device based on regenerative tail gas desorption auxiliary agent according to claim 1, it is characterized in that 4-8 heating areas (301) are arranged in the heating sleeve (30), a mounting block (300) is arranged in each heating area (301), two soil stirring plates (31) are arranged on each mounting block (300) in parallel up and down, the two soil stirring plates (31) are driven by a gear and a chain, a device cavity (17) is arranged at the bottom end in the device shell (1), two rotating shafts (170) are horizontally arranged in the device cavity (17), the two rotating shafts (170) are driven by gears and chains, and the two rotating shafts (170) are respectively in transmission with the soil stirring plate (31) at the lower end of each mounting block (300) through gears and chains, the stirring motor (32) provides power for one of the rotating shafts (170).
4. The organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent, according to claim 1, wherein the vibrating screen (22) is provided with movable sleeves (222) at edges thereof, the bottom end inside the screening chamber (11) is provided with a sliding rod (223), the movable sleeves (222) are movably sleeved on the sliding rod (223), and the sliding rod (223) is provided with a return spring (224).
5. The organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent as claimed in claim 1, wherein the number of the scrapers (42) is 6-10, and two scrapers (42) form a group, 4 second lead screws (421) are horizontally arranged in the adsorption chamber (40), two of the second lead screws (421) respectively penetrate one side of the adsorption chamber (40), two of the second lead screws (421) are respectively provided with a second driven pulley (422), and two of the second lead screws (421) are respectively in threaded connection with the scrapers (42) close to one side of the adsorption chamber (40), the other two of the second lead screws (421) respectively penetrate the other side of the adsorption chamber (40), the other two of the second lead screws (421) are respectively provided with a second driven pulley (422), and the other two of the second lead screws (421) are respectively in threaded connection with the scrapers (42) close to the other side of the adsorption chamber (40), the scraper motors (420) are provided with two, the output shafts of the two scraper motors (420) are provided with second main belt wheels (423), and the second main belt wheels (423) are respectively in transmission with two second driven belt wheels (422) on the same side through a belt.
6. The organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent as claimed in claim 1, wherein the lower end of the scraper (42) is provided with teeth (424), the scraper (42) is provided with guide holes (425), and the guide holes (425) are located at the upper ends of the teeth (424).
7. The organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent, according to claim 1, is characterized in that the tail gas desorption auxiliary agent is an activated alumina auxiliary agent using a ceramic raschig ring as a carrier, and the preparation method thereof comprises: and (3) impregnating the ceramic Raschig ring carrier with an aluminum nitrate solution, standing at room temperature for 1-3 h, drying at 30-60 ℃ for 8-15 h, and finally calcining at 150-300 ℃ for 0.5-2 h in an inert atmosphere to obtain the activated alumina auxiliary agent with the ceramic Raschig ring as the carrier.
8. Method for remediating organically contaminated soil using the apparatus as set forth in any one of claims 1 to 7, comprising the steps of:
s1, supplying power to the induced draft fan (14), the screening motor (20), the heating sleeve (30), the stirring motor (32) and the scraper motor (420) through an external power supply respectively;
s2, putting the organic contaminated soil into a screening cavity (11) through a feed hopper (13), driving two first lead screws (200) to rotate in a reciprocating mode by a screening motor (20), enabling two screening plates (21) to move in the screening cavity (11) in a reciprocating mode and located at the upper end of a vibrating screen (22), crushing the organic contaminated soil, enabling scraping teeth (210) on the two screening plates (21) to move in a mutually staggered mode by a ratchet wheel (213), further crushing the soil, enabling crushed soil particles to fall onto the vibrating screen (22), continuously vibrating the vibrating screen (22) under the action of a screening motor (20) and a cam shaft (220), screening the soil, enabling the screened soil to fall into a heating cavity (12), and discharging impurities in the soil through a box door (110);
s3, after entering a heating cavity (12), soil particles fall into each heating area (301), a screening cavity (11) and the heating cavity (12) are isolated by a movable inserting plate (16), soil is heated by a heating sleeve (30), and meanwhile a soil stirring plate (31) is driven by a stirring motor (32) to stir, so that sufficient heating is facilitated, organic pollutants in the soil are converted into gas, and the gas enters an adsorption cavity (10) through a pipeline (15);
s4, the organic gas that gets into in attaching chamber (10) is at first through gas homogenizing board (40) then, then pass thermal desorption auxiliary agent (41) under the effect of draught fan (14), organic matter in the gas is by exhaust desorption auxiliary agent (41) discharge apparatus shell (1) after holding back, adsorb the processing procedure, utilize scraper blade motor (420) to drive two sets of scraper blade (42) reciprocating motion, utilize tooth (424) on scraper blade motor (420) to constantly scrape thermal desorption auxiliary agent, be favorable to the make full use of tail gas desorption auxiliary agent, soil after the thermal desorption processing is discharged through discharge door (120), tail gas desorption auxiliary agent is through reuse behind the high temperature desorption simultaneously.
9. The organic contaminated soil remediation device based on the regenerative tail gas desorption auxiliary agent as claimed in claim 1, wherein the tail gas desorption auxiliary agent is prepared by a method comprising: and (3) impregnating the ceramic Raschig ring carrier with an aluminum nitrate solution, standing at room temperature for 1-3 h, drying at 30-60 ℃ for 8-15 h, and finally calcining at 150-300 ℃ for 0.5-2 h in an inert atmosphere to obtain the activated alumina auxiliary agent with the ceramic Raschig ring as the carrier.
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