CN115351057A - Soil remediation method for normal-temperature enhanced desorption - Google Patents
Soil remediation method for normal-temperature enhanced desorption Download PDFInfo
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- CN115351057A CN115351057A CN202210815109.5A CN202210815109A CN115351057A CN 115351057 A CN115351057 A CN 115351057A CN 202210815109 A CN202210815109 A CN 202210815109A CN 115351057 A CN115351057 A CN 115351057A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention discloses a soil remediation method for normal-temperature reinforced desorption, which comprises the following steps: step 1, arranging a plurality of pipe ditches on the ground in the greenhouse, wherein air main pipes with switches and a plurality of small branch pipes are arranged in the pipe ditches; step 2, pretreating the soil containing volatile organic pollution; step 3, piling the treated polluted soil above the pipe trench into a strip pile shape, placing an air suction pipe above the polluted soil, and covering a film; step 4, opening a main air pipe valve in the ditch, and blowing desorption gas treated by a waste gas device into the polluted soil stack; step 5, utilizing an induced draft fan to send the waste gas rich in organic pollutants in the film into a waste gas treatment device through a pipeline for treatment; and 6, judging the soil desorption degree through desorption gas detection. The method utilizes forced convection of air, shortens the soil remediation time, reduces the collection amount of desorbed waste gas through film covering, realizes the treatment of waste gas without discharging the waste gas to the outside of the system, and has the functions of energy conservation and emission reduction.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to a soil remediation method for normal-temperature reinforced desorption.
Background
Organic pollution in soil is caused by leakage of human factors in production activities such as mining, transportation, processing, storage and the like of human beings, and the organic pollution changes the physicochemical property and the biological community structure of the soil in the soil and enters a biosphere through the enrichment effect to stress the lives of people and animals and plants. The national soil pollution condition survey bulletin issued in 4 months in 2014 shows that the exceeding standard rate of the soil pollution in China reaches 16.1 percent. In recent years, with the increasing importance of the country on the ecological environment, more and more chemical enterprises are moved to remote suburbs, the organic pollutants in the field soil are left to seriously exceed the standard, the secondary development and utilization of the land are seriously influenced, and the land resources are seriously wasted, so that the field pollution remediation is urgent.
At present, the soil remediation technologies for volatile organic pollutants mainly include a soil vapor extraction technology, a soil leaching technology, a biological storage yard technology, a plant remediation technology, an incineration technology, a photodegradation technology, a normal temperature desorption technology and the like. The incineration technology has the advantages that the effect of removing soil organic matters is thorough, but the soil property can be damaged, the photodegradation technology is slow and the treatment is not thorough, the soil leaching technology and the gas phase extraction technology can cause secondary pollution to the environment, the cost is high, the method is not suitable for large-area polluted sites under the current economic and social conditions of China, the content of VOCs in the soil can be effectively reduced through normal-temperature desorption, the operation cost is low, the secondary pollution is less, and the method is a soil remediation technology with development prospect. However, the conventional normal-temperature desorption soil remediation technology has long remediation time and low remediation efficiency, and restricts the large-area popularization and application of the technology.
Therefore, it is necessary to provide a normal temperature desorption technique with short repair time and high repair efficiency.
Disclosure of Invention
Based on the above, the invention aims to provide a normal-temperature reinforced desorption soil remediation method, which can solve the problems of long remediation time and low remediation efficiency in the existing normal-temperature desorption soil remediation technology.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a normal-temperature reinforced desorption soil remediation method is characterized by comprising the following steps:
step 1, arranging a plurality of pipe ditches on the ground of a sunlight greenhouse, arranging an air main pipe with a plurality of small branch pipes and a controllable switch in each pipe ditch, and arranging a waste gas treatment device with a draught fan outside the greenhouse;
step 2, pretreating the soil of the organic pollution site;
step 3, piling the treated polluted soil above the pipe ditches into a strip pile shape, placing a waste gas collecting pipeline connected with a waste gas treatment device outside the greenhouse on the polluted soil pile, closing an air inlet valve of an air main pipe in the pipe ditches, starting an induced draft fan of the waste gas treatment device, then performing turning disturbance on the soil, and covering a thin film above the polluted soil after turning is finished;
step 4, opening a main air pipe valve in the pipe ditch, and blowing desorption gas treated by the waste gas device into the polluted soil stack through the main air pipe in the pipe ditch;
step 5, collecting the waste gas rich in organic pollutants in the film by using an induced draft fan of the waste gas treatment device through a waste gas collecting pipeline, and sending the waste gas into the waste gas treatment device for treatment;
and 6, judging the soil desorption effect through the desorption gas detection data, further detecting the soil after the soil desorption effect reaches the standard, and if the soil desorption effect reaches the corresponding restoration target value, repeating the operation of the steps 3-5 until the target restoration value is reached.
Preferably, the waste gas treatment device comprises a bag-type dust collector, an activated carbon purifier and an induced draft fan.
Preferably, the distance between every two ditches is the same in the step 1, the number of the ditches and the air main pipes with the branch pipes is set according to the actual floor area of the greenhouse, the height of the soil pile is 1.0-1.5 m, and the width of the soil pile is 2-2.5 m.
Preferably, step 1 trench sets up removable cover, and soil falls into the trench when avoiding polluting soil stack. A branch pipe opening on the air main pipe with the branch pipe in the step 1 is provided with a movable ventilating cover plate, so that the soil is prevented from falling into a pipeline when the soil is stacked.
Preferably, in step 2, the pre-treatment of the contaminated soil comprises crushing, screening, mixing aggregates and the like.
Preferably, in the step 3, the soil turning disturbance is to turn the soil by using a strip stack type turning machine, so as to increase the porosity of the soil. When turning, the air inlet valve of the air main pipe in the pipe ditch is closed, the draught fan is started, the area around the polluted soil is kept in a negative pressure environment, and organic pollutants are prevented from being discharged to other areas of the greenhouse when the turning is carried out. The film above the contaminated soil pile is directly covered on the contaminated soil pile and is covered on the waste gas collecting pipe on the soil pile, and the film is turned and thrown preferably for at least 2 hours in the noon every day.
Preferably, in step 4, the blowing of the desorption air into the contaminated soil through the ground pipe trench is to uniformly blow air into the soil stack by using an air branch pipe on the air pipeline.
Preferably, a duct gas distributor is provided on each branch on the branched air main to ensure even gas blowing into the soil pile.
Preferably, in step 6, the method for detecting the desorbed gas is PID field detection, and the method for further detecting the soil is GS-MS detection.
Compared with the prior art, the invention has the following beneficial effects:
1. through the design to the inner structure of sunshine big-arch shelter, increase the facility of blowing and collect the facility at big-arch shelter soil buttress inside and make the air in the inside forced convection of soil buttress, organic pollutant is taken away rapidly after volatilizing the entering air in soil for the update rate of soil particle surface air, the mass transfer concentration difference that has increased organic pollutant, thereby strengthen normal atmospheric temperature desorption soil repair process, shorten repair time, increase the remediation efficiency.
2. Through covering the film on polluting soil, prevent that organic pollutant from giving off to the big-arch shelter in, collect the pipeline through waste gas in the tectorial membrane to the tectorial membrane contains organic pollutant waste gas and collect simultaneously, the waste gas collection volume that can significantly reduce reduces the power consumption.
3. The waste gas that is rich in organic pollutant in with the big-arch shelter is taken out through the draught fan and is sent into waste gas treatment device and handle the back and then drum inside the big-arch shelter, and waste gas cyclic utilization does not externally discharge and gets into the environment, reduces the repairing process and causes secondary pollution to the environment.
Drawings
FIG. 1 is a flow chart of a soil remediation method by normal-temperature enhanced desorption.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, the method for restoring soil by normal temperature enhanced desorption provided by the present invention includes the following steps:
step 1, a plurality of pipe ditches are arranged on the ground of the greenhouse, and an air main pipe with a plurality of small branch pipes is distributed in the ditches. In a preferred embodiment, the trenches are spaced apart by the same distance.
And 2, pretreating the soil of the organic pollution site, wherein the pretreatment comprises crushing, screening, aggregate mixing and the like.
And 3, piling the treated polluted soil above the pipe ditch into a strip pile shape, turning and disturbing the soil by using a turning machine, and covering a thin film on the polluted soil after turning and throwing are finished. The turning and disturbance of the soil by using the turning and throwing machine is to turn and throw the soil by using the strip stack type turning and throwing machine so as to increase the porosity of the soil. When turning, the air inlet valve of the air main pipe in the pipe ditch is closed, the draught fan is started, the area around the polluted soil is kept in a negative pressure environment, and organic pollutants are prevented from being discharged to other areas of the greenhouse when the turning is carried out.
And 4, opening an air inlet valve of the air main pipe in the pipe ditch, and blowing the desorbed gas treated by the waste gas device into the soil stack through the air main pipe in the ground air blowing ditch, wherein the desorbed gas is uniformly blown into the soil stack from the branch pipes on the air main pipe with the branch pipes in the air blowing ditch.
And 5, collecting the waste gas rich in organic pollutants in the film by using an induced draft fan through a pipeline, conveying the waste gas into a waste gas treatment device for treatment, and collecting the waste gas through a waste gas collecting pipeline on the soil stack, and conveying the waste gas into the waste gas treatment device.
And 6, judging the soil desorption effect by the desorption gas detection data, further detecting the soil after the soil reaches the standard, transporting the soil to a temporary stacking field for stacking after the soil reaches the corresponding remediation target value, and finally disposing after the soil is accepted by a third-party detection mechanism.
The specific implementation steps are as follows:
firstly, determining the range of the polluted soil according to a detailed survey report of the polluted land, then excavating the polluted land soil according to a preset excavation scheme, carrying out a series of treatments such as crushing, screening and aggregate mixing on the excavated polluted soil in a pretreatment workshop, then conveying the pretreated soil into a sunlight greenhouse by using a transport vehicle, and piling the soil on a pipe ditch into a plurality of stacks by using a piling vehicle, wherein the height of the soil stack is 1.0-1.5 m, and the width of the soil stack is 2-2.5 m.
After the soil stacking is finished, closing an air inlet valve of an air main pipe in the pipe ditch every 12 to 14 days, opening a draught fan, turning and disturbing the soil by using a turning machine, and covering a film on the soil stack after the turning and throwing are finished. Then open the pipe ditch in the air be responsible for the admission valve with the desorption gas after exhaust treatment device handles send into through the pipe ditch in the air of taking the branch pipe is responsible for and sends into contaminated soil buttress, and waste gas is collected through the waste gas collection pipeline of tectorial membrane below and is sent into exhaust treatment device.
After the operation is repeated for a period of time, the desorption gas is subjected to on-site detection, the soil is further detected after the on-site detection data reach the standard, as a preferred embodiment, the desorption gas is subjected to on-site detection by adopting PID (proportion integration differentiation) detection, the soil is further detected by adopting GC-MS (gas chromatography-mass spectrometry), the detection result reaches the target restoration value and then is sent to a temporary stacking yard, the next batch of polluted soil is restored, and the operation is repeated when the target restoration value is not reached.
In the invention, the time for each air blowing can be set according to the actual condition of the polluted soil.
In the present invention, in order to ensure uniform blowing, as a preferred embodiment, a duct gas distributor may be provided on each branch pipe on the branched air main pipe to ensure uniform blowing of gas into the soil pile.
In the invention, the number of the pipe ditches and the air main pipes with the branch pipes is set according to the actual floor area of the greenhouse, and the main purpose is to ensure the uniformity of an air flow field above the polluted soil and strengthen the restoration effect.
Comparative example: taking polluted soil with the depth of 1.0m in an old site of a certain relocation factory, stacking volatile organic compounds and semi-volatile organic compounds in the soil on the ground of a sunlight greenhouse according to the traditional normal-temperature thermal desorption repair process, wherein the types of the volatile organic compounds and the semi-volatile organic compounds in the soil comprise benzene (0.11 mg/kg), naphthalene (15.09 mg/kg), benzo (a) pyrene (14.48 mg/kg), benzo (a) anthracene (22.87 mg/kg), benzo (b) fluoranthene (17.14 mg/kg), benzo (k) fluoranthene (10.98 mg/kg), indeno (1, 2, 3-cd) pyrene (5.82 mg/kg) and the like, the size of the greenhouse is 45m 10m, the soil is turned over at a speed of 12-00/day, an induced draft fan of the waste gas treatment device is started at the same time, the operation is repeated for 10 days, soil pollutants are detected, and the detection data comprise benzene (0.10 mg/kg), naphthalene (14.30 mg/kg), benzo (a) pyrene (5.35 mg/kg), benzo (a) anthracene (18.6 mg/kg), benzo (b) fluoranthene (16.85 mg/kg), benzo (k) fluoranthene (8.63 mg/kg) and indeno (1, 2, 3-cd) pyrene (4.33 mg/kg).
The embodiment of the invention comprises the following steps: an equal amount of contaminated soil in the same place as in the comparative example, in which volatile organic and semi-volatile organic species were benzene (0.11 mg/kg), naphthalene (15.09 mg/kg), benzo (a) pyrene (14.48 mg/kg), benzo (a) anthracene (22.87 mg/kg), benzo (b) fluoranthene (17.14 mg/kg), benzo (k) fluoranthene (10.98 mg/kg), indeno (1, 2, 3-cd) pyrene (5.82 mg/kg), etc., was stacked inside a sunlight greenhouse of the same size, was different from the comparative example in that the sunlight greenhouse of this example was designed in accordance with the method described in the foregoing. And (5) closing an air inlet valve of an air main pipe in the pipe trench, starting a draught fan, turning and disturbing the soil by using a turning machine, and covering a film on the soil stack after turning is finished. Then, an air inlet valve of an air main pipe in the pipe ditch is opened, desorption gas treated by the waste gas treatment device is sent into the polluted soil stack through the air main pipe with a branch pipe in the pipe ditch, waste gas is collected and sent into the waste gas treatment device through a waste gas collecting pipeline below the covering film, the operation is repeated for 10 days, soil pollutants are detected, and detection data comprise benzene (0.07 mg/kg), naphthalene (10.33 mg/kg), benzo (a) pyrene (2.38 mg/kg), benzo (a) anthracene (15.33 mg/kg), benzo (b) fluoranthene (16.87 mg/kg), benzo (k) fluoranthene (7.85), indeno (1, 2, 3-cd) pyrene (3.64 mg/kg), and the following results are easily found by comparing the two embodiments: under the conditions of the same properties and the same repair time of the polluted soil, the soil is repaired by the method, and the content of various volatile and semi-volatile organic pollutants in the repaired soil is obviously lower than that of the soil repaired by the traditional normal-temperature thermal desorption soil repair method. Therefore, the strengthening effect of the invention on soil remediation is remarkable.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various 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 (9)
1. A soil remediation method for normal-temperature enhanced desorption is characterized by comprising the following steps:
step 1, arranging a plurality of pipe ditches on the ground of a sunlight greenhouse, arranging an air main pipe with a plurality of small branch pipes and a controllable switch in each pipe ditch, and arranging a waste gas treatment device with a draught fan outside the greenhouse;
step 2, pretreating the soil of the organic pollution site;
step 3, piling the treated polluted soil above the pipe ditches into a strip pile shape, placing a waste gas collecting pipeline connected with a waste gas treatment device outside the greenhouse on the polluted soil pile, closing an air inlet valve of an air main pipe in the pipe ditches, starting an induced draft fan of the waste gas treatment device, then performing turning disturbance on the soil, and covering a thin film above the polluted soil after turning is finished;
step 4, opening a main air pipe valve in the pipe ditch, and blowing the desorption gas treated by the waste gas device into the polluted soil stack through the main air pipe in the pipe ditch;
step 5, collecting the waste gas rich in organic pollutants in the thin film through a waste gas collecting pipeline by using a draught fan of the waste gas treatment device, and sending the waste gas into the waste gas treatment device for treatment;
and 6, judging the soil desorption effect through the desorption gas detection data, further detecting the soil after the soil desorption effect reaches the standard, and repeating the operation of the steps 3-5 until the target remediation value is reached if the corresponding remediation target value is not reached.
2. The soil remediation method by normal-temperature enhanced desorption according to claim 1, wherein the waste gas treatment device comprises a bag-type dust remover, an activated carbon purifier and an induced draft fan.
3. The soil remediation method for normal-temperature enhanced desorption is characterized in that in the step 1, the distance between every two ditches is the same, the number of the ditches and the main air pipe with the branch pipe is set according to the actual floor area of the greenhouse, the height of the soil pile is 1.0-1.5 m, and the width of the soil pile is 2-2.5 m.
4. The soil remediation method for normal-temperature enhanced desorption as claimed in claim 1, wherein in the step 1, the pipe ditch is provided with a movable cover plate, and a branch pipe opening of the main air pipe with branch pipes is provided with a movable ventilating cover plate, so that the soil is prevented from falling into the pipe ditch and the pipeline when the polluted soil is stacked.
5. The soil remediation method by normal-temperature enhanced desorption as claimed in claim 1, wherein in the step 2, the pretreatment of the contaminated soil comprises crushing, screening and mixing of aggregates.
6. The soil remediation method for normal-temperature reinforced desorption, according to claim 1, wherein in the step 3, the soil is turned and disturbed by a strip stack type turning machine, so that the porosity of the soil is increased; when turning, the air inlet valve of the air main pipe in the pipe ditch is closed, and the induced draft fan is opened, so that the area around the polluted soil is kept in a negative pressure environment, and organic pollutants are prevented from being discharged to other areas of the greenhouse when turning is performed; the film above the contaminated soil pile is directly covered on the contaminated soil pile and is covered on the waste gas collecting pipe on the soil pile; the daily turning is preferably at least 2 hours at noon.
7. The soil remediation method of claim 1, wherein in step 4, the desorption air is blown into the contaminated soil through the ground pipe trench by uniformly blowing air into the soil pile through the air branch pipes of the air pipes.
8. The soil remediation method by normal temperature enhanced desorption as claimed in claim 1, wherein a duct gas distributor is provided on each branch pipe of the branched main air pipe to ensure that gas is uniformly blown into the soil pile.
9. The soil remediation method for normal-temperature enhanced desorption according to claim 1, wherein in the step 6, the desorption gas detection method is PID field detection, and the soil further detection method is GS-MS detection.
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| CN111036663A (en) * | 2019-12-17 | 2020-04-21 | 中科鼎实环境工程有限公司 | Soil normal temperature turns over throwing device |
| CN210876740U (en) * | 2019-10-30 | 2020-06-30 | 北京泷涛环境修复有限公司 | Normal-temperature analysis turning device for polluted soil |
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| CN213728521U (en) * | 2020-09-14 | 2021-07-20 | 中节能大地环境修复有限公司 | Volatile organic contaminated soil treatment greenhouse system |
| CN215543678U (en) * | 2021-08-03 | 2022-01-18 | 北辰(上海)环境科技有限公司 | Normal temperature desorption system of volatile organic contaminated soil |
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| US5067852A (en) * | 1990-05-24 | 1991-11-26 | J. B. Plunkett Associates, Inc. | Method and apparatus for removing volatile contaminants from contaminated soil |
| JPH08299945A (en) * | 1995-05-02 | 1996-11-19 | Ohbayashi Corp | Method for purifying contaminated soil |
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