CN112139230A - Thermal desorption soil remediation method - Google Patents
Thermal desorption soil remediation method Download PDFInfo
- Publication number
- CN112139230A CN112139230A CN202010902329.2A CN202010902329A CN112139230A CN 112139230 A CN112139230 A CN 112139230A CN 202010902329 A CN202010902329 A CN 202010902329A CN 112139230 A CN112139230 A CN 112139230A
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- soil
- heating device
- thermal desorption
- heating
- spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
Abstract
The invention discloses a thermal desorption soil remediation method, which is characterized by comprising the following steps: sampling and detecting on-site soil, excavating and transporting the soil to a restoration site, conveying the soil into a heating device by using a conveying device, regulating and controlling the internal temperature of the heating device according to a detection result, and performing reinspection on the restored soil; and (5) spraying and humidifying the qualified soil, and backfilling the qualified soil. According to the invention, the thermal desorption remediation method is arranged to heat and volatilize the organic matters in the soil into a gaseous state, the heated and volatilized organic matters are introduced, and the rechecking device is used for rechecking at the same time, so that the soil remediation efficiency is ensured, the removal rate is improved to more than 99%, the remediation effect is improved, the secondary pollution problem of the soil is reduced, the organic matters in the soil are heated and volatilized at the most appropriate temperature by detecting the content of the organic matters in the soil, the remediation efficiency is improved, and the resource waste is reduced.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a thermal desorption soil remediation method.
Background
Due to the combustion of fossil fuels, the leakage of petroleum, the stacking of agricultural and industrial solid wastes such as industrial sewage and sludge and the wide use of pesticides, organic pollutants such as phthalate, polycyclic aromatic hydrocarbons, organic chlorine, organic phosphorus pesticides and the like directly or indirectly enter the soil environment, and the organic pollutants are easy to be adsorbed by soil particles due to fat solubility and remain in the soil for a long time. Some of the organic matters are carcinogenic, teratogenic or mutagenic substances, and the organic matters can not only reduce the yield of crops and even stop the crop harvest, but also enter a food chain through plants or animals, thereby bringing serious influence on the survival and health of the human beings.
The existing soil remediation technology has the following defects, the remediation effect is poor, the soil is subjected to secondary pollution, the remediation efficiency is low, and the working efficiency is low.
Disclosure of Invention
The invention aims to provide a thermal desorption soil remediation method to solve the problems of secondary soil pollution, low remediation efficiency and low working efficiency caused by poor remediation effect in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of thermal desorption soil remediation comprising:
sampling and detecting the soil on site;
excavating and transporting soil to a repair site;
conveying the soil into a heating device by using a conveying device;
regulating and controlling the internal temperature of the heating device according to the detection result;
rechecking the repaired soil;
spraying and humidifying the qualified soil;
and backfilling qualified soil.
Preferably, the sampling and detecting of the soil on site specifically comprises: randomly sampling the field soil, taking three samples per thousand square meters, respectively detecting the organic matter content of the samples, removing the maximum value and the minimum value from the detection result, and calculating the average of the rest values.
Preferably, the excavating and transporting the soil to the repair site specifically includes: and excavating and transporting the field soil to a restoration site by an excavator and a transport vehicle.
Preferably, the soil is conveyed into the heating device by using the first conveying device, and the method specifically includes: the soil is conveyed to the upper end surface of the first conveying device, and the first conveying device conveys the soil to the interior of the heating device through the input valve.
Preferably, the regulating and controlling the internal temperature of the heating device according to the detection result specifically includes: inside first conveyor carried soil to heating device, heating device closed input valve, conveyer stop work this moment, heating device is to soil batch formula heating, according to the inside temperature of testing result debugging heating device, the inside rabbling mechanism that is provided with of heating device, rabbling mechanism does not stop the stirring to soil in the heating process, it is even to keep the soil heating, after the completion is restoreed in the inside heating of waiting to heat device, input valve opens, the work of second transmission device, carry out next batch soil heating and restore.
Preferably, the soil after the restoration is subjected to rechecking, which specifically comprises: after heating device accomplished the restoration, output valve opens, carries soil to the reinspection device through third transmission device, detects whether up to standard organic content in the soil, if not up to standard will carry out the second time restoration in continuing to send to heating device, when testing result reaches standard, will carry out spray set through fourth conveyor.
Preferably, the spraying and humidifying of the qualified soil specifically comprises: after the qualified soil enters the spraying device, a spraying cavity is used for humidifying the soil through a spraying head, the original humidity of the soil is kept, and the humidified soil is conveyed to a recovery bin.
Preferably, the qualified soil backfilling specifically comprises: the restored soil is transported to an excavation site through an excavator transport vehicle, backfilling is carried out, and the original ecological appearance and environment are kept.
Preferably, the inside rabbling mechanism that is provided with of heating device, rabbling mechanism carry out even stirring to the soil in the heating device, make inside heating device's temperature can be melted into soil completely for organic matter pyrolysis speed in the soil is provided with tail gas processing apparatus in heating device's exit, and when organic matter in the soil reached the boiling point, make the inside organic matter of soil portion volatilize into gaseous state diffusion to the external world, and gas passes through tail gas processing apparatus and filters, discharges to the external world again after filtering.
Preferably, the spraying device comprises a spraying cavity and a nozzle, a proper amount of water and a soil repairing agent are added into the spraying cavity, the water and the soil repairing agent are prepared in a certain proportion, and the prepared liquid is sprayed into the soil through the nozzle, so that the soil reaches the original humidity in the field.
Compared with the prior art, the invention provides a thermal desorption soil remediation method, which has the following beneficial effects:
1. according to the invention, the thermal desorption remediation method is arranged to heat and volatilize the organic matters in the soil into a gaseous state, the heated and volatilized organic matters are introduced, and the rechecking device is used for rechecking at the same time, so that the soil remediation efficiency is ensured, the removal rate is improved to more than 99%, the remediation effect is improved, the secondary pollution problem of the soil is reduced, the organic matters in the soil are heated and volatilized at the most appropriate temperature by detecting the content of the organic matters in the soil, the remediation efficiency is improved, and the resource waste is reduced.
2. The invention is provided with the stirring mechanism inside the heating device, the stirring mechanism continuously stirs the soil in the heating and volatilizing process, the contact area of the soil and the hot gas is improved, the soil is uniformly heated, the heating efficiency is improved, and the repairing efficiency is improved.
3. The spraying device is arranged, when the heated soil passes through the spraying device, the liquid in the spraying cavity is sprayed into the soil by the nozzle, so that the soil keeps the original humidity after being heated, and meanwhile, the liquid can effectively improve the soil, promote the microbial activity of the soil and enhance the fertilizer water permeability of the soil.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention without limiting the invention in which:
FIG. 1 is a schematic flow chart of an embodiment of the present invention;
FIG. 2 is a logic flow diagram of a soil remediation method according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an apparatus according to an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1-3, the present invention provides a technical solution: a method of thermal desorption soil remediation comprising:
s1) sampling and detecting the soil on site: carry out random sampling to on-the-spot soil, every thousand square meters get three samples, carry out organic matter content to the sample respectively and detect, maximum value and minimum are got rid of to the testing result, and the average is calculated to the rest value, detects and calculates through the multiunit sample, makes the testing result more accurate, is favorable to adjusting the temperature in the heating device.
S2) excavating and transporting soil to a repair site: and excavating and transporting the field soil to a restoration site by an excavator and a transport vehicle. The repair site can be constructed near the site, so that the conveying time and the transportation cost can be greatly reduced.
S3) conveying the soil into the heating device by using the conveying device: the soil is conveyed to the upper end surface of the first conveying device, and the first conveying device conveys the soil to the interior of the heating device through the input valve.
S4) regulating and controlling the internal temperature of the heating device according to the detection result: the first conveying device conveys soil into the heating device, when the soil is conveyed to a set threshold value, the heating device closes the input valve, the conveying device stops working at the moment to complete first batch conveying, the heating device heats the soil in a batch mode, the temperature in the heating device is debugged according to a detection result, the soil is heated and volatilized at the most suitable temperature, the repair efficiency is improved, and meanwhile, the resource waste is reduced, a stirring mechanism is arranged in the heating device, the stirring mechanism continuously stirs the soil in the heating process, the contact area of the soil and hot gas is increased, the soil is uniformly heated, the heating efficiency of the soil is improved, after the heating repair in the heating device is completed, the input valve is opened, the second conveying device works to perform heating repair on the next batch of soil, the heating device opens the input valve, and the first conveying device works, and opening to convey the next batch of soil.
S5) performing rechecking on the soil after the remediation is completed: after heating device accomplished the restoration, output valve opens, carries soil to the reinspection device through third transmission device, detects whether up to standard organic content in the soil, if not up to standard will carry out the second time restoration in continuing to send to heating device, when testing result reaches standard, will carry out spray set through fourth conveyor. The rechecking device detects soil once more, improves and detects the precision, ensures the prosthetic efficiency of soil simultaneously, prevents to reach standard for repairing, causes secondary pollution.
S6) spraying and humidifying the qualified soil: after the qualified soil enters the spraying device, the spraying cavity humidifies the soil through the spraying head, the original humidity of the soil is kept, the humidified soil is conveyed to the recovery bin, and then complete soil remediation in batches is completed.
S7) qualified soil backfilling: the restored soil is transported to an excavation site through an excavator transport vehicle, backfilling is carried out, and the original ecological appearance and environment are kept.
Heating device is inside to be provided with rabbling mechanism, when soil carries out heating device inside, the rabbling mechanism begins work, the soil of rabbling mechanism in to heating device carries out the even stirring, inside making heating device's temperature can blend into soil completely, accelerate the pyrolysis speed of organic matter in the soil, be provided with tail gas processing apparatus in heating device's exit of exhausting simultaneously, when organic matter in the soil reaches the boiling point, make the inside organic matter of soil portion volatilize into gaseous state diffusion to the external world, gas passes through tail gas processing apparatus and filters, discharge to the external world again after filtering, prevent that harmful gas from not letting ecological environment.
Spray set is including spraying chamber and shower nozzle, at spraying intracavity portion add proper amount water and soil remediation agent, soil remediation agent comprises multiple probiotic, make the diversity of beneficial flora large amount of increases recovery soil microbial community in the soil, the gas permeability is strengthened, effectively solve the soil hardening problem, improve the soil micro-ecological environment, make water and soil remediation agent be the proportion allotment, the chamber is sprayed in the liquid of allotment after the allotment, liquid after will allotting through the shower nozzle sprays to soil in, make soil reach the humidity in original scene.
The method comprises the steps of firstly analyzing the soil on site in a factory, calculating the content of organic matters, then transporting the orange soil to a soil remediation site through a special tool, after the content of the organic matters is obtained through calculation, setting the temperature in a heating device, adjusting the most suitable temperature to heat and volatilize the orange soil, thereby improving the remediation efficiency, simultaneously reducing the resource waste, after the soil is transported into the heating device, closing an input valve, starting a stirring mechanism to stir the soil in the heating device, improving the contact area of the soil and hot air, keeping the soil heated uniformly, improving the heating efficiency, opening an output valve after the remediation is finished, transporting the soil to a rechecking device to recheck the soil, improving the remediation efficiency, and preventing the unqualified soil from entering the heating device again for secondary remediation due to other reasons, the qualified soil is sprayed by the spraying device, the original humidity of the soil is kept after the soil is heated by blending the liquid, meanwhile, the liquid can effectively improve the soil, promote the microbial activity of the soil and enhance the soil fertility and water permeability, and the invention is suitable for the batch soil organic pollution remediation of smaller projects.
In summary, the invention has the advantages that:
1. according to the invention, the thermal desorption remediation method is arranged to heat and volatilize the organic matters in the soil into a gaseous state, the heated and volatilized organic matters are introduced, and the rechecking device is used for rechecking at the same time, so that the soil remediation efficiency is ensured, the removal rate is improved to more than 99%, the remediation effect is improved, the secondary pollution problem of the soil is reduced, the organic matters in the soil are heated and volatilized at the most appropriate temperature by detecting the content of the organic matters in the soil, the remediation efficiency is improved, and the resource waste is reduced.
2. The invention is provided with the stirring mechanism inside the heating device, the stirring mechanism continuously stirs the soil in the heating and volatilizing process, the contact area of the soil and the hot air is increased, the soil is uniformly heated, the heating efficiency is improved, and the repairing efficiency is improved.
3. The spraying device is arranged, when the heated soil passes through the spraying device, the liquid in the spraying cavity is sprayed into the soil by the nozzle, so that the soil keeps the original humidity after being heated, and meanwhile, the liquid can effectively improve the soil, promote the microbial activity of the soil and enhance the fertilizer water permeability of the soil.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A thermal desorption soil remediation method is characterized by comprising the following steps:
sampling and detecting the soil on site;
excavating and transporting soil to a repair site;
conveying the soil into a heating device by using a conveying device;
regulating and controlling the internal temperature of the heating device according to the detection result;
rechecking the repaired soil;
spraying and humidifying the qualified soil;
and backfilling qualified soil.
2. A method for thermal desorption soil remediation according to claim 1 in which: to on-spot soil sampling test, specifically include: randomly sampling the field soil, taking three samples per thousand square meters, respectively detecting the organic matter content of the samples, removing the maximum value and the minimum value from the detection result, and calculating the average of the rest values.
3. A method for thermal desorption soil remediation according to claim 1 in which: excavation transportation soil specifically includes to the restoration place: and excavating and transporting the field soil to a restoration site by an excavator and a transport vehicle.
4. A method for thermal desorption soil remediation according to claim 1 in which: utilize first conveyor to carry soil to heating device in, specifically include: the soil is conveyed to the upper end surface of the first conveying device, and the first conveying device conveys the soil to the interior of the heating device through the input valve.
5. A method for thermal desorption soil remediation according to claim 1 in which: the regulation and control of the internal temperature of the heating device according to the detection result specifically comprises: inside first conveyor carried soil to heating device, heating device closed input valve, conveyer stop work this moment, heating device is to soil batch formula heating, according to the inside temperature of testing result debugging heating device, the inside rabbling mechanism that is provided with of heating device, rabbling mechanism does not stop the stirring to soil in the heating process, it is even to keep the soil heating, after the completion is restoreed in the inside heating of waiting to heat device, input valve opens, the work of second transmission device, carry out next batch soil heating and restore.
6. A method for thermal desorption soil remediation according to claim 1 in which: the soil after the restoration is subjected to rechecking, and the method specifically comprises the following steps: after heating device accomplished the restoration, output valve opens, carries soil to the reinspection device through third transmission device, detects whether up to standard organic content in the soil, if not up to standard will carry out the second time restoration in continuing to send to heating device, when testing result reaches standard, will carry out spray set through fourth conveyor.
7. A method for thermal desorption soil remediation according to claim 1 in which: spraying and humidifying qualified soil, and specifically comprises the following steps: after the qualified soil enters the spraying device, a spraying cavity is used for humidifying the soil through a spraying head, the original humidity of the soil is kept, and the humidified soil is conveyed to a recovery bin.
8. A method for thermal desorption soil remediation according to claim 1 in which: the qualified soil backfilling specifically comprises the following steps: the restored soil is transported to an excavation site through an excavator transport vehicle, backfilling is carried out, and the original ecological appearance and environment are kept.
9. A method for thermal desorption soil remediation according to claim 5 in which: the inside rabbling mechanism that is provided with of heating device, the soil of rabbling mechanism in to heating device carries out even stirring, inside making heating device's temperature can blend into soil completely for organic matter pyrolysis speed in the soil is provided with tail gas processing apparatus in heating device's exit simultaneously, and when organic matter in the soil reached the boiling point, it diffused to the external world to make the inside organic matter of soil portion volatilize into the gaseous state, and gas filters through tail gas processing apparatus, discharges to the external world again after filtering.
10. A method of thermal desorption soil remediation according to claim 7 in which: the spraying device comprises a spraying cavity and a spray head, wherein a proper amount of water and a soil repairing agent are added into the spraying cavity, so that the water and the soil repairing agent are prepared in a certain proportion, and the prepared liquid is sprayed into soil through the spray head, so that the soil reaches the humidity of the original site.
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| CN202010902329.2A CN112139230A (en) | 2020-09-01 | 2020-09-01 | Thermal desorption soil remediation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113634592A (en) * | 2021-06-29 | 2021-11-12 | 杨凌锦华生态技术股份有限公司 | Ecological restoration method for heavy metal soil by using crops |
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Application publication date: 20201229 |