CN111360056B - Soil microwave remediation device and remediation method - Google Patents
Soil microwave remediation device and remediation method Download PDFInfo
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- CN111360056B CN111360056B CN202010116214.0A CN202010116214A CN111360056B CN 111360056 B CN111360056 B CN 111360056B CN 202010116214 A CN202010116214 A CN 202010116214A CN 111360056 B CN111360056 B CN 111360056B
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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
Abstract
The invention relates to the technical field of soil remediation, and particularly discloses a soil microwave remediation device and a remediation method. The soil microwave prosthetic devices includes: the sample containing device is used for containing a soil sample to be treated; a microwave emitter; the gas cylinder is communicated with one end of the sample containing pipe device and is used for continuously injecting inert gas into the sample containing pipe device; and the gas absorption device is communicated with the other end repairing box body of the sample containing device and is used for absorbing harmful gas generated in the sample containing device repairing box body. The soil microwave remediation device can obviously improve the soil microwave remediation efficiency, and cannot generate secondary pollution to the atmosphere and the remediated soil.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to a soil microwave remediation device and a remediation method.
Background
In recent years, with the adjustment of industrial layout in China and the relocation of urban construction enterprises, enterprises such as numerous chemical plants, electroplating plants, metal smelting plants, steel plants, transformer substations and the like leave heavy polluted sites with a large amount of high-concentration organic matters and heavy metals after the relocation, which endangers human residence safety and peripheral ecological safety, and becomes a soil environment problem to be solved urgently.
The soil remediation method for organic matters mainly comprises a physical method, a chemical method and a biological method, and a soil thermal desorption remediation technology is one of the widely applied methods, and the soil is heated to a specific temperature by an indirect or direct heating method, so that pollutants such as petroleum hydrocarbon, polycyclic aromatic hydrocarbon and the like in the soil are volatilized or decomposed, finally enter a gas phase and are treated by the next process. The technology is characterized in that microwaves penetrate into soil, so that all parts in the soil can obtain heat at the same moment to increase the temperature, and the purpose of separating pollutants from the soil is achieved. However, the existing microwave soil thermal remediation method cannot completely treat organic matters in soil, the microwave thermal desorption efficiency is low, and volatile gas generated in the treatment process is easy to cause secondary pollution to the environment and soil.
The invention provides a soil microwave remediation device and a remediation method, which can obviously improve the soil microwave remediation efficiency and can not generate secondary pollution to the atmosphere and the remediated soil, and aims to solve the problems that the organic matter in the soil is not thoroughly treated, the microwave thermal desorption efficiency is low, the soil or the atmosphere is easily subjected to secondary pollution and the like in the existing microwave soil thermal remediation method.
Disclosure of Invention
The invention provides a soil microwave remediation device and a remediation method, aiming at the problems that the existing microwave soil thermal remediation method is incomplete in treatment of organic matters in soil, low in microwave thermal desorption efficiency and easy to cause secondary pollution to soil or atmosphere.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a soil microwave remediation device comprising:
the sample containing device is used for containing a soil sample to be treated; the sample containing device is provided with an air inlet and an air outlet;
the microwave emitter is used for emitting microwaves into the sample containing device;
the gas cylinder is communicated with the gas inlet of the sample containing device and is used for continuously injecting inert gas into the sample containing device;
and the gas absorption device is communicated with the gas outlet of the sample containing device and is used for absorbing harmful gas generated in the sample containing device.
Compared with the prior art, the soil microwave remediation device provided by the invention can prevent harmful gas generated in the microwave treatment process of soil from directly entering the air to cause environmental pollution; the soil sample is placed in the sample holding device, and the inert gas is continuously introduced into the sample holding device through the gas cylinder, so that heat and harmful gas generated by the pyrolysis of the soil in the microwave remediation process can be rapidly taken out, the microwave remediation efficiency of the soil is improved, and the secondary pollution of the generated harmful substances to the soil is avoided; harmful gases brought out by the inert gases can be fully removed from the inert gases and macromolecular organic matters by a gas absorption device; the whole soil microwave remediation device is small in size and convenient to operate, and can not pollute the atmosphere and generate secondary pollution to the remediated soil while improving the soil microwave remediation efficiency.
Preferably, the sample holding device is in a long cylindrical shape.
Preferably, the sample containing device is detachably connected with the gas cylinder and the gas processing device through communicating interfaces respectively.
Preferably, the sample holding device is a ceramic tube.
Preferably, a flow meter is arranged on a communicating pipe between the gas cylinder and the sample containing device.
Preferably, the inert gas is nitrogen.
Preferably, an air pump is arranged between the gas processing device and the sample holding device, and is used for enabling gas in the gas cylinder to enter the sample holding device and then enter the gas processing device.
Preferably, a condenser is further communicated between the gas processing device and the air pump.
Preferably, the gas treatment device comprises a gas absorption device and a gas adsorption device which are communicated in sequence along the gas flow direction.
Preferably, the gas absorption device comprises a plurality of absorption bottles.
Preferably, the gas adsorption device is an activated carbon adsorption tank.
The invention also provides a soil remediation method by using the soil microwave remediation device. The repairing method at least comprises the following steps:
step a, placing a soil sample to be treated added with a microwave absorbent in a sample containing device without influencing the gas circulation in the sample containing device;
b, introducing inert gas in the gas cylinder into the sample containing device, and opening the microwave emitter to perform microwave irradiation treatment, wherein the frequency of the microwave irradiation treatment is 2400MHz-50GHz, the microwave power is 1-10kW, and the treatment time is 10-30 min;
and c, treating the gas generated in the sample containing device by using the gas treatment device.
Compared with the prior art, the soil remediation method by using the soil microwave remediation device provided by the invention has the advantages that the microwave absorbent is added into a soil sample to be treated, the microwave irradiation treatment frequency, power and treatment time are set to be the specific values, so that microwaves can fully penetrate into the soil, a plurality of organic matters in the soil can rapidly obtain heat and can be separated from the soil, and the structure and subsequent use of the soil cannot be damaged; under the microwave frequency of 2400MHz-50GHz, can improve the adsorption capacity of the microwave absorbent in the soil to heavy metals, effectively reduce the influence of the heavy metals to the soil.
Preferably, the soil sample to be treated is obtained by uniformly mixing soil and a microwave absorbent according to the mass ratio of 45-55:1, adding water to enable the water content of the soil sample to be treated to be 20-30%, and standing for 20-40 min.
The preferable proportion of the soil and the microwave absorbent and the adjustment of the water content of the soil can further improve the soil remediation efficiency.
Preferably, the flow rate of the inert gas is 1000-
Preferably, the microwave absorbent comprises the following components in parts by weight: attapulgite clay: 35-45 parts of nano titanium dioxide: 10-17 parts of ferrite: 20-30 parts of Fe3(CO)12: 15-26 parts of solvent: 55-65 parts of a blending agent: 10-13 parts of flame retardant: 14-20 parts.
Under the specific microwave treatment condition, organic matters and partial mineral matters in the attapulgite are combined, so that the adsorption capacity of the microwave absorbent on heavy metals in the soil can be further improved, and the heavy metals can be wrapped and fixed; the combination of titanium dioxide and ferrite can further promote the decomposition or carbonization of organic matters in soil, and the oxidation-reduction reaction is carried out to change the organic matters into small molecules, and Fe is used3(CO)12The reducing agent is used for promoting the reduction of nitro in soil; partial products and heavy metals generated by microwave pyrolysis are quickly fixed between the crystal lattice layers of the ferrite, so that the solidification of the heavy metals is realized, and the soil remediation effect is further improved.
The preferable microwave absorbent has the advantages of strong wave absorption capability, wide wave absorption frequency band, large specific surface area and stable performance.
Preferably, the blending agent is alpha-ketoglutaric acid; the flame retardant is Co (CO) with the mass ratio of 7-10:7-103H and Sb2O3(ii) a The solvent is ethanol, methanol or isopropanol.
Drawings
FIG. 1 is a schematic structural diagram of a soil microwave remediation device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a soil microwave remediation device provided with a box body in an embodiment of the invention;
the device comprises a box body 1, a box body 2, rollers 3, a gas cylinder 4, a flowmeter 5, a sample containing device 6, a microwave emitter 7, an air pump 8, a controller 9, a condenser 10, an alkali absorption bottle 11, an acid absorption bottle 12 and an activated carbon adsorption tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in figure 1, the soil microwave remediation device comprises a sample holding device 5, a gas cylinder 3 and a gas absorption device; the sample containing device 5 is used for containing a soil sample to be treated, and the sample containing device 5 is provided with an air inlet and an air outlet; the microwave emitter 6 is used for emitting microwaves into the sample containing device 5; the gas cylinder 3 is communicated with a gas inlet of the sample containing device 5 and is used for continuously injecting inert gas into the sample containing device 5; the gas absorption device is communicated with the gas outlet of the sample holding device 5 and is used for absorbing harmful gas generated in the sample holding device 5.
The soil microwave remediation device provided by the invention can prevent harmful gas generated in the microwave treatment process of soil from directly entering the air to cause environmental pollution; placing a soil sample 5 to be treated in a sample containing device 5, and continuously introducing inert gas into the sample containing device 5 through a gas cylinder 3, so that heat and harmful gas generated by pyrolysis of soil in a microwave remediation process can be rapidly taken out, the microwave remediation efficiency of the soil is improved, and secondary pollution of the generated harmful substances to the soil is avoided; harmful gas accessible gas absorbing device that brings out through inert gas fully gets rid of acid and alkaline gas and macromolecule organic matter wherein, and whole device is small, convenient operation, when improving soil microwave remediation's efficiency, can not pollute the atmosphere, and can not produce secondary pollution to prosthetic soil.
As another specific embodiment of the soil microwave remediation device, as shown in fig. 2, a sample containing device 5 and a microwave emitter 6 are wrapped in a box body 1, and a roller 2 can be installed on the lower end surface of the box body 1, so that the soil microwave remediation device can move conveniently;
as another specific embodiment of the soil microwave remediation device of the invention, as shown in fig. 2, the soil microwave remediation device further comprises a controller 8, the controller 8 is electrically connected with the gas cylinder 3 and the microwave emitter 6 to control the gas cylinder 3 and the microwave emitter 6, and the controller 8 is fixed on the outer side surface of the box body 1 to realize an automatic soil remediation process of the soil microwave remediation device.
As another embodiment of the soil microwave remediation device, the sample holding device 5 is in the shape of a long cylinder.
As another specific embodiment of the soil microwave remediation device, the sample containing device 5 is a ceramic tube.
As another specific embodiment of the soil microwave remediation device, the sample holding device 5 is detachably connected with the gas cylinder 3 and the gas absorption device through communication interfaces respectively, so that the sample holding device 5 can be detached and replaced by a new soil sample to be treated.
As another embodiment of the soil microwave remediation device, a flow meter 4 is arranged on a communicating pipe between the gas cylinder 3 and the sample holding device 5 to control the flow of the inert gas.
As another specific embodiment of the soil microwave remediation device of the invention, the inert gas is nitrogen.
As another specific embodiment of the soil microwave remediation device, an air pump 7 is arranged between the gas treatment device and the sample holding device 5, and is used for enabling gas in the gas cylinder 3 to enter the sample holding device 5 and then enter the gas treatment device; a condenser 9 is also communicated between the gas processing device and the air pump 7.
High-temperature gas in the sample containing device 5 is condensed through the condenser 9, water vapor and partial organic matters are condensed, the load of a subsequent gas absorption device is reduced, and the efficiency of harmful gas adsorption treatment is increased.
As another specific embodiment of the soil microwave remediation device, the gas treatment device comprises a gas absorption device and a gas adsorption device which are communicated in sequence along the gas flow direction.
As another specific embodiment of the soil microwave remediation device, the gas absorption device comprises a plurality of absorption bottles.
As another specific embodiment of the soil microwave remediation device, the gas adsorption device is an activated carbon adsorption tank 12.
As another specific embodiment of the soil microwave remediation device, the gas absorption device comprises an alkali absorption bottle 10, an acid absorption bottle 11 and an activated carbon adsorption tank 12 which are communicated in sequence.
As another specific embodiment of the soil microwave remediation device, the alkali absorption liquid in the alkali absorption bottle 10 is a sodium sulfide solution with the concentration of 1 mol/L; the acid absorption liquid in the acid absorption bottle 11 is a potassium permanganate solution with the concentration of 0.2 mol/L.
The gas passes through an alkaline sodium sulfide solution to absorb acid gas, then enters a potassium permanganate solution to be oxidized, and finally is adsorbed by using activated carbon, so that the content of harmful gas in the discharged gas is almost zero, and the atmosphere cannot be polluted.
The concrete implementation mode of the soil remediation method by the soil microwave remediation device comprises the following steps:
in the soil, the organic matter mainly comprises Polycyclic Aromatic Hydrocarbons (PAHs) with a content of 200mg/m3。
Step a, uniformly mixing soil and a microwave absorbent according to a mass ratio of 45:1, adding water to enable the water content of a soil sample to be treated to be 20%, and standing for 20min to obtain the soil sample to be treated; uniformly paving the soil sample to be treated in the sample holding device 5 without influencing the gas circulation in the sample holding device 5; the microwave absorbent comprises the following components in parts by weight: attapulgite clay: 35 parts of nano titanium dioxide: 10 parts, ferrite: 20 parts of Fe3(CO)12: 15 parts of ethanol: 55 parts, alpha-ketoglutaric acid: 10 parts of Co (CO) in a mass ratio of 1:13H and Sb2O3: 14 parts of (1);
b, introducing inert gas in the gas cylinder 3 into a sample containing device 5, and opening a microwave emitter 6 to perform microwave irradiation treatment, wherein the frequency of the microwave irradiation treatment is 2400MHz, the microwave power is 1kW, and the treatment time is 1 min; wherein the flow rate of the inert gas in the gas cylinder 3 is 1000 mL/min;
and c, treating the gas generated in the sample containing device 5 by using a gas treatment device.
The content of organic matters in the soil repaired by the repairing method is 7mg/m3And the discharged gas completely reaches the discharge standard.
As another specific embodiment of the soil remediation method by the soil microwave remediation device of the invention, the method specifically comprises the following steps:
step a, uniformly mixing soil and a microwave absorbent according to a mass ratio of 50:1, adding water to enable the water content of a soil sample to be treated to be 25%, and standing for 30min to obtain the soil sample to be treated; uniformly paving the soil sample to be treated in the sample holding device 5 without influencing the gas circulation in the sample holding device 5; the microwave absorbent comprises the following components in parts by weight: attapulgite clay: 40 parts of nano titanium dioxide: 15 parts, ferrite: 25 parts of Fe3(CO)12: 20 parts, methanol: 60 parts, alpha-ketoglutaric acid: 12 parts of Co (CO) with the mass ratio of 8:93H and Sb2O3: 18 parts of a mixture;
b, introducing inert gas in the gas cylinder 3 into a sample containing device 5, and opening a microwave emitter 6 to perform microwave irradiation treatment, wherein the frequency of the microwave irradiation treatment is 10GHz, the microwave power is 5kW, and the treatment time is 20 min; wherein the flow rate of the inert gas in the gas cylinder 3 is 1200 mL/min;
and c, treating the gas generated in the sample containing device 5 by using a gas treatment device.
The content of organic matters in the soil repaired by the repairing method is 9mg/m3And the discharged gas completely reaches the discharge standard.
As another specific embodiment of the soil remediation method by the soil microwave remediation device of the invention, the method specifically comprises the following steps:
step a, uniformly mixing soil and a microwave absorbent according to a mass ratio of 55:1, adding water to enable the water content of a soil sample to be treated to be 30%, and standing for 40min to obtain the soil sample to be treated; uniformly paving the soil sample to be treated in the sample holding device 5 without influencing the gas circulation in the sample holding device 5; wherein the microwave absorbent comprises the followingThe components in parts by weight are as follows: attapulgite clay: 45 parts of nano titanium dioxide: 17 parts, ferrite: 30 parts of Fe3(CO)12: 26 parts, isopropyl alcohol: 65 parts, alpha-ketoglutaric acid: 13 parts of Co (CO) with the mass ratio of 8:73H and Sb2O3: 20 parts of (1);
b, introducing inert gas in the gas cylinder 3 into a sample containing device 5, and opening a microwave emitter 6 to perform microwave irradiation treatment, wherein the frequency of the microwave irradiation treatment is 50GHz, the microwave power is 10kW, and the treatment time is 30 min; wherein the flow rate of the inert gas in the gas bottle 3 is 1500 mL/min;
and c, treating the gas generated in the sample containing device 5 by using a gas treatment device.
The content of organic matters in the soil repaired by the repairing method is 6mg/m3And the discharged gas completely reaches the discharge standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A soil remediation method by using a soil microwave remediation device is characterized by comprising the following steps: the soil microwave prosthetic devices includes:
the sample containing device is used for containing a soil sample to be treated; the sample containing device is provided with an air inlet and an air outlet;
the microwave emitter is used for emitting microwaves into the sample containing device;
the gas cylinder is communicated with the gas inlet of the sample containing device and is used for continuously injecting inert gas into the sample containing device;
the gas absorption device is communicated with the gas outlet of the sample containing device and is used for absorbing harmful gas generated in the sample containing device;
the soil remediation method at least comprises the following steps:
step a, placing a soil sample to be treated added with a microwave absorbent in the sample containing deviceAnd does not affect the gas circulation in the sample holding device; the soil sample to be treated is obtained by uniformly mixing soil and a microwave absorbent according to the mass ratio of 45-55:1, adding water to enable the water content of the soil sample to be treated to be 20-30%, and standing for 20-40 min; the microwave absorbent comprises the following components in parts by weight: attapulgite clay: 35-45 parts of nano titanium dioxide: 10-17 parts of ferrite: 20-30 parts of Fe3(CO)12: 15-26 parts of solvent: 55-65 parts of a blending agent: 10-13 parts of flame retardant: 14-20 parts;
b, introducing inert gas in the gas cylinder into the sample containing device, and opening the microwave emitter to perform microwave irradiation treatment, wherein the frequency of the microwave irradiation treatment is 2400MHz-50GHz, the microwave power is 1-10kW, and the treatment time is 10-30 min; the flow rate of the inert gas is 1000-1500 mL/min;
and c, treating the gas generated in the sample containing device by using the gas treatment device.
2. The soil remediation method of claim 1 utilizing a soil microwave remediation device, wherein: the sample holding device is in a long cylinder shape; and/or
The sample containing device is detachably connected with the gas cylinder and the gas processing device through communicating interfaces respectively.
3. The soil remediation method of claim 2 utilizing a soil microwave remediation device, wherein: the sample containing device is a ceramic tube.
4. The soil remediation method of claim 1 utilizing a soil microwave remediation device, wherein: a flowmeter is arranged on a communicating pipe between the gas cylinder and the sample containing device; and/or
The inert gas is nitrogen; and/or
An air extracting pump is arranged between the gas processing device and the sample containing device and is used for enabling gas in the gas cylinder to enter the sample containing device and then enter the gas processing device; and/or
And a condenser is also communicated between the gas processing device and the air pump.
5. The soil remediation method of claim 1 utilizing a soil microwave remediation device, wherein: the gas treatment device comprises a gas absorption device and a gas absorption device which are sequentially communicated along the gas flowing direction.
6. The soil remediation method of claim 5 utilizing a soil microwave remediation device, wherein: the gas absorption device comprises a plurality of absorption bottles; and/or
The gas adsorption device is an activated carbon adsorption tank.
7. The soil remediation method of claim 1 utilizing a soil microwave remediation device, wherein: the blender is alpha-ketoglutaric acid; the flame retardant is Co (CO) with the mass ratio of 7-10:7-103H and Sb2O3(ii) a The solvent is ethanol, methanol or isopropanol.
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| CN1949961A (en) * | 2005-10-11 | 2007-04-18 | 上海俊悦光纤网络科技有限公司 | Method for producing microwave absorbent and polyurethane type absorbing material for dark chamber |
| CN101110275A (en) * | 2006-07-19 | 2008-01-23 | 华子昂 | Material for shielding electromagnetic radiation in ionic field and manufacturing method thereof |
| CN101235208A (en) * | 2008-03-06 | 2008-08-06 | 方远建设集团股份有限公司 | Asphalt capable of being heated by microwave and preparation method thereof |
| CN101249502A (en) * | 2008-04-03 | 2008-08-27 | 上海交通大学 | Thermal decomposition repairing method containing chromium soil |
| CN101513643A (en) * | 2009-03-20 | 2009-08-26 | 华中科技大学 | In situ microwave repairing method and apparatus of contaminated soil |
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