CN114769305A - Soil remediation device and remediation method - Google Patents
Soil remediation device and remediation method Download PDFInfo
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- CN114769305A CN114769305A CN202210457088.4A CN202210457088A CN114769305A CN 114769305 A CN114769305 A CN 114769305A CN 202210457088 A CN202210457088 A CN 202210457088A CN 114769305 A CN114769305 A CN 114769305A
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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
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- 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
Abstract
The invention relates to the technical field of soil remediation, and discloses a soil remediation device and a remediation method, which comprise a steam injection module, an ultrasonic module, an electrode plate, a steam extraction module and a recharge module; the steam injection module comprises an injection pipe, a heater, a clean water tank and a water pump, wherein the injection pipe is communicated with the heater, the clean water tank is communicated with the heater, and the water pump is communicated with the clean water tank; the ultrasonic module comprises an ultrasonic generator and an ultrasonic probe which are connected; the electrode plate and soil pollutants are subjected to electrochemical catalytic oxidation reaction; the steam extraction module comprises an exhaust pipe, a vacuum pump, a VOC adsorption mechanism and a cooling mechanism, wherein the vacuum pump is respectively communicated with the exhaust pipe and the VOC adsorption mechanism, and the cooling mechanism is respectively communicated with the clean water tank and the VOC adsorption mechanism; the recharging module comprises a nutrition tank, a liquid pump and a liquid outlet pipe which are communicated; the injection tube, the exhaust tube and the liquid outlet tube are inserted into soil, and the ultrasonic wave heats the soil to improve the soil permeability.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a soil remediation device and a remediation method.
Background
At present, with the rapid development of social economy and high-intensity human activities, the polluted soil area is continuously enlarged, the harm is more and more serious, and the strategic goal of realizing sustainable development is influenced. Because soil has a confluent effect on environmental pollution, toxic and harmful chemical substances in soil are transferred through atmosphere and water, so that the survival, reproduction and life safety of human beings and animals are endangered, and the soil pollution becomes one of the global main environmental problems. Contaminated soil remediation refers to the process of transferring, absorbing, degrading and converting contaminants in soil to a concentration that is reduced to an acceptable level, or converting toxic and harmful contaminants into harmless substances, using physical, chemical or biological methods. In the prior art, polluted soil remediation can be divided into three types, namely physical remediation, chemical remediation and biological remediation according to different remediation principles. In practical application, the used repairing means are not completely the same according to the different types and properties of the soil polluted by different kinds, and the cross fusion of a plurality of repairing technical means is realized.
In patent CN111822495A, the invention provides a method for treating contaminated soil by combining thermal desorption technology and electrochemical reinforcement, and the specific embodiment comprises a solar module, an electrochemical reinforcement module, a microwave heating module, a nutrient solution spraying module and a gas phase extraction module, wherein the solar module is used for providing electric energy for a system, the microwave heating module is used for carrying out microwave heating on the contaminated soil, volatile organic compounds are removed by heating, and the volatile organic compounds are extracted by the gas phase extraction module and discharged outside; carrying out electrochemical oxidation degradation on pollutants in the soil under the action of current in the electrochemical enhancement module; the nutrient solution spraying module sprays nutrient solution into the polluted soil, and microorganisms in the polluted soil perform biodegradation on organic pollutants in the polluted soil after the microorganisms are cultured in the nutrient solution.
In this technical solution, there are mainly disadvantages: the thermal desorption technology is adopted, so that the water content in the soil is easy to evaporate, the water content of the soil is reduced, and the soil body is hardened; the microwave heating rod is easy to form local high temperature in the soil, the heat conduction is not uniform, and the removal efficiency of pollutants in the soil at unheated points is low; the spraying nutrient solution is influenced by the porosity of the soil, and is difficult to reach deep soil without loosening and vibrating.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing thermal desorption technology is easy to cause the water content of soil to be reduced due to the evaporation of water in the soil, and the soil body is hardened.
In order to solve the technical problem, the invention provides a soil remediation device, which comprises a steam injection module, an ultrasonic module, at least two electrode plates, a steam extraction module and a recharge module; the steam injection module comprises an injection pipe, a heater, a clean water tank and a water pump, the injection pipe is communicated with the heater through a pipeline, the clean water tank is communicated with the heater through a pipeline, the water pump is connected with the clean water tank through a pipeline, and the injection pipe is used for being inserted into soil; the ultrasonic module comprises an ultrasonic generator and an ultrasonic probe, and the ultrasonic generator is connected with the ultrasonic probe; the electrode plate is used for carrying out electrochemical catalytic oxidation reaction with soil pollutants; the steam extraction module comprises an extraction pipe, a vacuum pump, a VOC adsorption mechanism and a cooling mechanism, wherein the vacuum pump is respectively communicated with the extraction pipe and the VOC adsorption mechanism through pipelines, the cooling mechanism is respectively communicated with the clean water tank and the VOC adsorption mechanism through pipelines, and the extraction pipe is used for extending into soil; the recharge module comprises a nutrition tank, a liquid pump and a liquid outlet pipe, wherein the liquid pump is respectively connected with the clean water tank and the nutrition tank through a pipeline, the liquid outlet pipe is communicated with the nutrition tank, and the liquid outlet pipe is used for being inserted into soil.
Furthermore, the drain pipe comprises a recharge main pipe and a plurality of recharge branch pipes, the recharge main pipe is respectively communicated with the recharge branch pipes, the recharge main pipe is connected with the nutrient tank through a pipeline, and the recharge branch pipes are distributed at intervals in the vertical direction.
Furthermore, a plurality of permeation holes are formed in the recharging branch pipe at intervals, a filter screen is arranged on the recharging branch pipe, and the filter screen covers the permeation holes.
Further, the electrode plate comprises an anode plate and a cathode plate, and the distance between the anode plate and the cathode plate is 10-20 cm.
A remediation method using the soil remediation device, comprising the steps of:
s01, extending the liquid outlet pipe, the injection pipe, the ultrasonic probe, the electrode plate and the air suction pipe into the soil;
s02, starting a water pump and a heater, introducing water in a clean water tank into the heater by the water pump, gasifying the water by the heater to form water vapor, injecting the water vapor into the soil through an injection pipe, outputting ultrasonic waves to the soil by using an ultrasonic probe, forming cavitation in the soil, generating heat energy, and crushing the soil;
s03, electrifying the electrode plates, and carrying out electrochemical catalytic oxidation reaction on pollutants in the soil between the electrode plates;
s04, starting a vacuum pump, enabling the VOC to enter an air extraction pipe along with the water vapor, enabling the VOC adsorption mechanism to adsorb the VOC, separating the water vapor from the VOC, cooling the water vapor, and enabling the generated cooling water to enter a clear water tank;
s05, the liquid pump inputs the nutrient solution in the nutrient tank into the soil through the liquid outlet pipe.
Further, in step S02, the output power of the ultrasonic probe is 75 to 100kw, and the frequency of the ultrasonic wave output by the ultrasonic probe is 25 to 40 Hz.
Further, in step S03, the voltage between the electrode plates is 30-50V.
Further, in step S05, the nutrient solution is a mixture of a nitrogen fertilizer, a phosphate fertilizer, and a potassium fertilizer.
Compared with the prior art, the soil remediation device and the remediation method provided by the embodiment of the invention have the beneficial effects that: adopt the injection pipe to input vapor to soil, the cooperation ultrasonic wave is to soil heating, through ultrasonic cavitation, promotes soil permeability, and the flow of the vapor of being convenient for in soil simultaneously, the ultrasonic wave can form a plurality of cavitation centers in soil, combines steam heat conduction, has guaranteed the quick even heating of soil. Vapor can carry the VOC that soil produced to get into VOC adsorption apparatus and construct, realizes VOC's separation, and vapor can also retrieve into the clear water case, recharges to soil from the clear water case again, keeps soil moisture content stable.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure, 1, a steam injection module; 11. an injection tube; 12. a heater; 13. a clear water tank; 14. a water pump; 2. an ultrasonic module; 21. an ultrasonic generator; 22. an ultrasonic probe; 3. an electrode plate; 4. a steam extraction module; 41. an exhaust pipe; 42. a vacuum pump; 43. a VOC adsorption mechanism; 44. a cooling mechanism; 5. a recharge module; 51. a nutrition tank; 52. a liquid pump; 53. recharging the main pipe; 54. recharging the branch pipe; 6. and a power supply.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc., used herein to indicate the orientation or positional relationship, are based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, a soil remediation device according to a preferred embodiment of the present invention includes a steam injection module 1, an ultrasonic module 2, at least two electrode plates 3, a steam extraction module 4, a recharge module 5, and a power supply 6.
The power supply 6 supplies power to the steam injection module 1, the ultrasonic module 2, the electrode plate 3, the steam extraction module 4 and the recharge module 5. The steam injection module 1 comprises an injection pipe 11, a heater 12, a clean water tank 13 and a water pump 14, wherein the injection pipe 11 is communicated with the heater 12 through a pipeline, the clean water tank 13 is communicated with the heater 12 through a pipeline, the water pump 14 is connected with the clean water tank 13 through a pipeline, the clean water tank 13 is used for storing clean water, and the injection pipe 11 is used for being inserted into soil. When the water pump 14 and the heater 12 work, the water pump 14 pumps water in the clean water tank 13 into the heater 12, an electric heating pipe is arranged in the heater 12, the electric heating pipe can heat the water passing through the heater 12, the water is changed into steam under the heating of the electric heating pipe, and the injection pipe 11 injects the steam into soil.
The ultrasonic module 2 comprises an ultrasonic generator 21 and an ultrasonic probe 22, wherein the ultrasonic generator 21 is connected with the ultrasonic probe 22, the ultrasonic probe 22 can be inserted into soil, and after the ultrasonic generator 21 generates ultrasonic waves, the ultrasonic waves are input into the soil through the ultrasonic probe 22. The ultrasonic waves can form cavitation in the soil and generate heat energy to break the soil and form a large number of free radicals, and the free radicals and organic pollutants in the soil are subjected to oxidation reaction. Wherein, under the action of ultrasonic wave, cavitation bubbles formed in soil can generate very high pressure and temperature, water molecules in the cavitation bubbles are directly decomposed into OH and H, and the OH and H further react to generate more OH and H, HO2Isoradical and H2O2These free radicals and strong oxidants with high oxidation activity can oxidize and degrade high molecular organic pollutants in soil into small molecular fatty acid compounds, as shown in the following formula: RH + HO → R.H2O、R·+O2→ROO·、ROO·+RH→R·+ROOH。
The electrode plate 3 is used for carrying out electrochemical catalytic oxidation reaction with soil pollutants, the electrode plate 3 comprises an anode plate and a cathode plate, the distance between the anode plate and the cathode plate is 10-20 cm, and soil can be ensured to obtainAbundant electrochemistry catalytic oxidation reaction, in the in-service use, can set up multiunit plate electrode 3 according to the area of soil, ensures that soil can fully take place electrochemistry catalytic oxidation reaction. For some negative ion pollutants, such as dissociated phenols, etc., an iron rod and a carbon rod may be used as the cathode and anode electrode plates 3, and electromigration from carbon to iron may occur when an electrochemical catalytic oxidation reaction occurs, as shown in the following reaction formula: fe: fe-2 e-Fe2+；C：2H++2e－H2；O2+4H++4e－2H2And O. For some organic pollutants such as polycyclic aromatic hydrocarbon and the like, direct electrooxidation can be adopted, wherein the direct electrooxidation takes external voltage as a chemical reaction driving force, and under the aerobic condition, organic matters lose electrons on an electrode, change the molecular structure and are oxidized to mineralize into CO2And H20. Electrochemical combustion reaction of 2-naphthol: c10H8O+11.5O2＝10CO2+4H2O。
The steam extraction module 4 comprises an extraction pipe 41, a vacuum pump 42, a VOC adsorption mechanism 43 and a cooling mechanism 44, wherein the vacuum pump 42 is respectively communicated with the extraction pipe 41 and the VOC adsorption mechanism 43 through pipelines, the cooling mechanism 44 is respectively communicated with the clean water tank 13 and the VOC adsorption mechanism 43 through pipelines, the extraction pipe 41 is used for extending into soil, when VOC and water vapor generated in the soil are mixed, the gas in the soil can be extracted through the vacuum pump 42, the VOC and the water vapor enter the VOC adsorption mechanism 43, the VOC adsorption mechanism 43 absorbs the VOC, the remaining water vapor returns to the cooling mechanism 44, the cooling mechanism 44 cools the water vapor, and the water generated by cooling returns to the clean water tank 13 to realize the recycling of water. Wherein the VOC adsorption mechanism 43 can adopt a commercially available VOC purification system.
The recharge module 5 comprises a nutrient tank 51, a liquid pump 52 and a liquid outlet pipe, a nitrogen fertilizer, a phosphorus fertilizer and a potassium fertilizer mixture are stored in the nutrient tank 51, the liquid pump 52 is respectively connected with the clear water tank 13 and the nutrient tank 51 through a pipeline, the liquid outlet pipe is communicated with the nutrient tank 51 and used for being inserted into soil, the liquid pump 52 pumps water from the clear water tank 13, water is mixed with nutrient solution in the nutrient tank 51 through the nutrient tank 51, and the water and the nutrient solution are input into the soil through the liquid outlet pipe again to realize the restoration of soil fertility and water content.
The liquid outlet pipe comprises a recharging main pipe 53 and a plurality of recharging branch pipes 54, the recharging main pipe 53 is respectively communicated with the recharging branch pipes 54, the recharging main pipe 53 is connected with the nutrition tank 51 through a pipeline, and the recharging branch pipes 54 are arranged at intervals in the vertical direction. Nutrient solution and water output by the nutrient tank 51 flow into the recharge main pipe 53 and then flow into each recharge branch pipe 54 from the recharge main pipe 53, so that soil at different depths can be supplemented with fertility and moisture.
The recharging branch pipe 54 is provided with a plurality of permeation holes at intervals, and the permeation holes can enable soil to obtain more uniform nutrient solution and moisture. The recharging branch pipe 54 is provided with a filter screen which covers the penetration holes and prevents soil from entering the recharging branch pipe 54 from the penetration holes to block the recharging branch pipe 54.
A remediation method using the soil remediation device, comprising the steps of:
s01, the liquid outlet pipe, the injection pipe 11, the ultrasonic probe 22, the electrode plate 3 and the air suction pipe 41 are extended into the soil. S02, starting a water pump 14 and a heater 12, leading water in a clear water tank 13 into the heater 12 by the water pump 14, gasifying the water by the heater 12 to form water vapor, injecting the water vapor into soil through an injection pipe 11, meanwhile, outputting ultrasonic waves to the soil by an ultrasonic probe 22 to form cavitation inside the soil and generate heat energy, crushing the soil to form a large number of free radicals, and enabling the free radicals to have oxidation reaction with organic pollutants in the soil, wherein the output power of the ultrasonic probe 22 is 75-100 kw, and the frequency of the ultrasonic waves output by the ultrasonic probe 22 is 25-40 Hz, so that electric energy is saved on the premise of ensuring that the soil is sufficiently crushed. S03, the electrode plates 3 are electrified, the voltage between the cathode and the anode is controlled to be 30-50V, the pollutants in the soil are subjected to electrochemical catalytic oxidation reaction between the electrode plates 3, and the voltage is controlled to be 30-50V, so that the use efficiency of electric energy can be guaranteed to the greatest extent. S04, starting the vacuum pump 42, enabling the VOC to be desorbed from the soil under the transmission of water vapor and ultrasonic heat energy, enabling the VOC to enter the air extraction pipe 41 along with the water vapor, enabling the VOC adsorption mechanism 43 to adsorb the VOC, enabling the water vapor to be separated from the VOC, enabling the remaining water vapor to enter the cooling mechanism 44, cooling the water vapor by the cooling mechanism 44 to generate cooling water, and enabling the cooling water to enter the clear water tank 13. S05, the liquid pump 52 inputs the nutrient solution in the nutrient tank 51 into the soil through the liquid outlet pipe, and the restoration of the soil fertility and the water content is realized. Wherein the nutrient solution is a mixture of nitrogenous fertilizer, phosphate fertilizer and potash fertilizer, and the nutrient substances are easy to be absorbed by soil.
To sum up, the embodiment of the invention provides a soil remediation device and a remediation method, wherein the injection pipe 11 is adopted to input water vapor into soil, the soil is heated by matching with ultrasonic waves, the soil permeability is improved through ultrasonic cavitation, the water vapor can flow in the soil conveniently, meanwhile, the ultrasonic waves can form a plurality of cavitation centers in the soil, and the soil is ensured to be heated rapidly and uniformly by combining with steam heat conduction. The water vapor can carry the VOC that soil produced to get into VOC adsorption mechanism 43, realizes VOC's separation, and water vapor can also retrieve into clear water tank 13, recharges to soil from clear water tank 13 again in, keeps soil moisture content stable.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (8)
1. A soil remediation device, comprising:
the steam injection module comprises an injection pipe, a heater, a clean water tank and a water pump, wherein the injection pipe is communicated with the heater through a pipeline, the clean water tank is communicated with the heater through a pipeline, the water pump is connected with the clean water tank through a pipeline, and the injection pipe is used for being inserted into soil;
the ultrasonic module comprises an ultrasonic generator and an ultrasonic probe, and the ultrasonic generator is connected with the ultrasonic probe;
the device comprises at least two electrode plates, a first electrode plate and a second electrode plate, wherein the electrode plates are used for performing electrochemical catalytic oxidation reaction with soil pollutants;
the system comprises a steam extraction module, a heating module and a cooling module, wherein the steam extraction module comprises an exhaust pipe, a vacuum pump, a VOC adsorption mechanism and a cooling mechanism, the vacuum pump is respectively communicated with the exhaust pipe and the VOC adsorption mechanism through pipelines, the cooling mechanism is respectively communicated with a clean water tank and the VOC adsorption mechanism through pipelines, and the exhaust pipe is used for extending into soil; and
the recharging module comprises a nutrient tank, a liquid pump and a liquid outlet pipe, wherein the liquid pump is respectively connected with the clean water tank and the nutrient tank through a pipeline, the liquid outlet pipe is communicated with the nutrient tank, and the liquid outlet pipe is used for being inserted into soil.
2. The soil remediation device of claim 1, wherein: the liquid outlet pipe comprises a recharge main pipe and a plurality of recharge branch pipes, the recharge main pipe is respectively communicated with the recharge branch pipes, the recharge main pipe is connected with the nutrient tank through a pipeline, and the recharge branch pipes are arranged at intervals in the vertical direction.
3. The soil remediation device of claim 2, wherein: the recharge branch pipe is provided with a plurality of permeation holes at intervals, a filter screen is arranged on the recharge branch pipe, and the filter screen covers the permeation holes.
4. The soil remediation device of claim 1, wherein: the electrode plate comprises an anode plate and a cathode plate, and the distance between the anode plate and the cathode plate is 10-20 cm.
5. A remediation method using the soil remediation device of any one of claims 1 to 4 including the steps of:
s01, extending the liquid outlet pipe, the injection pipe, the ultrasonic probe, the electrode plate and the air suction pipe into the soil;
s02, starting a water pump and a heater, leading water in a clean water tank into the heater by the water pump, gasifying the water by the heater to form water vapor, injecting the water vapor into the soil through an injection pipe, meanwhile, outputting ultrasonic waves to the soil by using an ultrasonic probe, forming cavitation in the soil, generating heat energy and crushing the soil;
s03, electrifying the electrode plates, and carrying out electrochemical catalytic oxidation reaction on pollutants in the soil between the electrode plates;
s04, starting a vacuum pump, enabling the VOC to enter an air extraction pipe along with the water vapor, enabling the VOC adsorption mechanism to adsorb the VOC, separating the water vapor from the VOC, cooling the water vapor, and enabling the generated cooling water to enter a clear water tank;
s05, the liquid pump inputs the nutrient solution in the nutrient tank into the soil through the liquid outlet pipe.
6. The repair method according to claim 1, characterized in that: in step S02, the output power of the ultrasonic probe is 75 to 100kw, and the frequency of the ultrasonic wave output by the ultrasonic probe is 25 to 40 Hz.
7. The repair method according to claim 1, characterized in that: in step S03, the voltage between the electrode plates is 30-50V.
8. The repair method according to claim 1, characterized in that: in step S05, the nutrient solution is a mixture of nitrogenous fertilizer, phosphate fertilizer and potash fertilizer.
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