CN111360055A - In-situ microwave remediation equipment and method for organic matter contaminated soil - Google Patents
In-situ microwave remediation equipment and method for organic matter contaminated soil Download PDFInfo
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- CN111360055A CN111360055A CN202010115865.8A CN202010115865A CN111360055A CN 111360055 A CN111360055 A CN 111360055A CN 202010115865 A CN202010115865 A CN 202010115865A CN 111360055 A CN111360055 A CN 111360055A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention belongs to the technical field of soil remediation, and particularly relates to in-situ microwave remediation equipment and method for organic matter contaminated soil. This equipment includes box, air intake system, feed liquor system, microwave emitter and gas processing system, not only can improve the desorption effect of semi-volatile organic pollutant, can handle tail gas moreover, reduces the pollution of the tail gas that handles soil and produce to atmospheric. The method uses the equipment and adopts the repairing agent, and the organic pollutant contaminated soil is repaired by combining the microwave and the repairing agent, so that the desorption efficiency of volatile and semi-volatile organic pollutants is improved.
Description
Technical Field
The invention belongs to the technical field of soil remediation, and particularly relates to in-situ microwave remediation equipment and method for organic matter contaminated soil.
Background
Organic pollutants are one of the most widely distributed pollutants at contaminated sites. Organic pollutants can be adsorbed on soil particles and continuously released into soil and underground water, so that adverse effects on human health and ecological environment are caused. The soil thermal desorption remediation technology is one of the most effective methods for treating the pollutants, and the technology utilizes an indirect or direct heating method to heat and volatilize the pollutants such as volatile petroleum hydrocarbon, polycyclic aromatic hydrocarbon and the like in the soil into a gas phase, and the pollutants are collected and then treated by the next procedure. The semi-volatile organic pollutants are not easy to desorb, and the thermal desorption technology has poor treatment effect on the semi-volatile organic pollutants.
According to the soil treatment position, the thermal desorption technology is divided into in-situ heating and ex-situ heating. The ectopic heating technology needs to excavate, transport, backfill and the like a polluted site, consumes a large amount of manpower and material resources, and is not suitable for a volatile pollutant site close to a densely populated urban area. The in-situ thermal desorption soil remediation technology can be directly used for in-situ remediation in a polluted site, and has good economic and social significance.
The common in-situ thermal desorption method heats the soil through a thermal resistor or steam, the soil far away from a heat source is difficult to reach the required temperature, the removal time and the removal efficiency are influenced to a certain extent, the defects of long treatment time, high energy consumption and the like exist, and the desorption effect on semi-volatile organic pollutants in the soil is poor.
Disclosure of Invention
The invention aims to provide in-situ microwave remediation equipment for organic matter contaminated soil, which aims to solve the problem that semi-volatile organic matters in the organic matter contaminated soil are not easy to desorb at present, and can improve the desorption effect of volatile and semi-volatile organic pollutants in the soil by means of microwave penetration into the soil.
The invention also provides an in-situ microwave remediation method for the organic matter contaminated soil.
In order to achieve the purpose, the invention adopts the technical scheme that: the in-situ microwave remediation equipment for the organic matter contaminated soil comprises:
the box body is used for forming a closed space together with the soil surface;
the air inlet system is used for conveying air into the soil of the coverage area of the closed space;
the liquid inlet system is used for conveying a liquid repairing agent into the soil in the coverage area of the closed space;
the microwave transmitting device is used for transmitting microwaves to the soil in the coverage area of the closed space;
the gas treatment system is used for extracting and treating gas in the closed space;
the air inlet system comprises an air injection pump and an air inlet pipe communicated with the air injection pump, an air inlet of the air injection pump is positioned outside the closed space, the air inlet pipe is inserted into soil in a coverage area of the closed space, a plurality of air inlets are formed in the air inlet pipe, and the air inlets are all positioned in the soil in the coverage area of the closed space;
the liquid inlet system comprises a repairing agent storage tank and a liquid inlet pipe communicated with the repairing agent storage tank through a centrifugal water pump, the liquid inlet pipe is inserted into the soil in the closed space coverage area, a plurality of liquid inlets are formed in the liquid inlet pipe, and the liquid inlets are all located in the soil in the closed space coverage area;
the gas treatment system comprises a suction pump with a gas inlet positioned in the closed space and a gas purification system communicated with a gas outlet of the suction pump.
Preferably, the gas inlet pipe and the liquid inlet pipe are integrated into an integrated gas-liquid pipeline.
Preferably, a fixing frame is arranged inside the box body, and the centrifugal water pump, the air injection pump, the microwave transmitting device and the air suction pump are arranged on the fixing frame.
Preferably, the air inlet pipe is detachably connected with the air injection pump.
Preferably, the liquid inlet pipe is detachably connected with the repairing agent storage tank.
Preferably, the side wall of the box body is provided with a box plate which can be opened and closed.
Preferably, the bottom of the box body is provided with a moving device.
Preferably, the moving means is a rubber wheel.
Preferably, the gas purification system is sequentially provided with a condenser, a gas absorption tank and a gas adsorption tank which are communicated through pipelines along the gas transmission direction.
Preferably, the gas absorption tank is provided in plurality.
Preferably, the gas adsorption tank is filled with activated carbon, fly ash or diatomite.
Preferably, the in-situ microwave repair equipment is further provided with a control system, and a signal output end of the control system is connected with signal input ends of the centrifugal water pump, the air injection pump, the microwave transmitting device and the air suction pump.
Preferably, the box body is made of iron or aluminum.
The in-situ microwave remediation equipment for the organic matter contaminated soil has the beneficial effects that: the repairing agent storage tank is used for storing the prepared soil repairing agent and injecting the soil repairing agent into the liquid inlet pipe through the centrifugal water pump; the air injection pump sucks air from the outside and continuously injects the air into the soil through the air inlet pipe, so that the soil remediation agent and the air flow in the soil to bring out volatile organic pollutants; the microwave transmitting device converts electric energy provided by the outside into microwaves, so that the soil is heated quickly and uniformly, the reaction between the soil and the remediation agent and the volatilization of pollutants are accelerated, and the desorption effect of volatile and semi-volatile organic pollutants in the soil is improved; the air pump collects the volatile gas pollutants in the soil and sends the volatile gas pollutants into a subsequent gas purification system, so that the discharged gas meets the requirement of safe discharge. The equipment can improve the desorption effect of semi-volatile organic pollutants, can treat tail gas, and reduces the pollution of the tail gas generated by soil treatment to the atmosphere.
The embodiment of the invention also provides an in-situ microwave remediation method for the soil polluted by the organic matters, which is implemented by using the in-situ microwave remediation equipment for the soil polluted by the organic matters.
Preferably, the repairing method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities;
s2, covering the soil with the box body, and inserting the air inlet pipe and the liquid inlet pipe into the soil;
s3, starting the centrifugal water pump, and adding a repairing agent and water into the soil through a liquid inlet pipe to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and ferrous chloride (FeCl)2) Hydrogen peroxide (H)2O2) A mixture with a mass ratio of 25 (1-2) to 5-10; the repairing agent is 1/50-1/40 of the soil quality;
s4, closing a gap between the box body and the soil;
and S5, starting the air injection pump, the air suction pump and the microwave transmitting device.
The in-situ microwave remediation method for the soil polluted by the organic matters provided by the invention has the advantages that the microwave is penetrated into the soil by virtue of the microwave transmitting device of the equipment, the traditional point heating method is changed into bulk heating, so that all parts in the soil can obtain heat at the same moment to heat up, the energy loss is small, and the heating speed is high; simultaneously by using citric acid and FeCl2And H2O2Soil remediation agent prepared from three components and microwaveThe combined action promotes the cracking of organic pollutants in the soil and strengthens the desorption effect of microwaves on volatile and semi-volatile organic pollutants in the soil. The method carries out harmless treatment by continuously introducing and extracting air into the soil to bring out volatile pollutants and then by using a gas treatment system of the equipment, thereby reducing secondary pollution.
Wherein the sundries in the S1 are bricks and stones in the soil.
The reaction mechanism of the remediation agent with organic pollutants in the soil in S3 is as follows:
with Fe2+When used as a catalyst, H2O2The organic compound fertilizer can be efficiently decomposed to generate a large amount of hydroxyl radicals OH (the electrode potential is +2.73V, and is next to fluorine), the OH has strong oxidizing property and high electron affinity, can perform dehydrogenation reaction with saturated hydrocarbon, performs addition reaction with unsaturated hydrocarbon and aromatic hydrocarbon, and oxidatively degrades petroleum pollutants such as alkane and aromatic hydrocarbon, and the reaction products are low molecular weight organic matters, carbon dioxide, water and other inorganic salts, so that the soil polluted by the organic matters can be repaired. In the reaction H2O2The decomposition process of (a) is as follows:
H2O2+Fe2+→Fe3++·OH+OH-
Fe2++·OH→Fe3++OH-
Fe3++H2O2→Fe2++H++HO2·
but H2O2The speed of oxidizing organic matters is extremely high, which is not beneficial to the continuous removal of the organic matters, and the citric acid in the repairing agent can be used as a stabilizer to keep the continuous generation of high-activity OH ions, and can improve H2O2Thereby improving the oxidation efficiency of the repairing agent.
In the S4, a rubber sheet can be used for sealing the gap between the box body and the soil, so that the volatilized harmful gas is prevented from entering the atmosphere. This step may be performed after S2.
And (S5) performing microwave irradiation treatment on the soil to decompose and volatilize the organic pollutants, and working together with the air injection pump and the air suction pump to discharge volatilized gas from the soil.
The main mechanism of removing the pollutants by the in-situ microwave repairing method comprises the following steps: (1) thermal desorption, wherein organic pollutants are heated and volatilized, and enter a gas phase from soil; (2) pyrolysis at high temperature, wherein organic pollutants in the gas phase are heated and decomposed; (3) catalytic oxidation, with the temperature rising, the iron-containing repairing agent, soil, water and introduced air act together to generate a large amount of free radicals, such as hydroxyl free radical (OH)-) And superoxide radical (. O)3-) The like active species have strong oxidizing property and can degrade organic pollutants; (4) the ferrite is stable under heat, and iron and soil form ferrite at high temperature, so that organic pollutants in the solidified soil can be adsorbed, and the activity and the mobility of the organic pollutants are reduced;
the in-situ microwave repair method has the beneficial effects that:
(1) the polluted soil is repaired in situ without digging, transporting and backfilling;
(2) compared with the traditional thermal desorption method, the microwave heating method has the advantages that the energy is saved, and the soil is heated more uniformly;
(3) using citric acid, FeCl2、H2O2As a repairing agent, the desorption efficiency of volatile and semi-volatile organic pollutants is improved, and the repairing agent is degradable and environment-friendly;
(4) the repairing objects are wide and comprise a plurality of organic pollutants;
(5) the volatile gas is subjected to harmless treatment, and secondary pollution is avoided.
Preferably, the microwave frequency of the microwave transmitting device is 2400MHz, the microwave transmitting time is 10-30 minutes, and the microwave power is 1-10 kW.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an in-situ microwave remediation device for organic-contaminated soil according to an embodiment of the invention;
in the figure:
1. a box body; 11. a fixed mount; 12. a boxboard; 13. a mobile device;
2. a centrifugal water pump, 21 and a repairing agent storage tank;
3. an air injection pump; 31. a gas-liquid pipeline;
4. a microwave emitting device;
5. an air pump; 51. a condenser; 52. a first gas absorption tank; 53. a second gas absorption tank; 54. a gas adsorption tank;
6. a control panel.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and 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.
Example 1
Referring to fig. 1, the in-situ microwave remediation apparatus for organic contaminated soil according to the present invention will now be described. This normal position microwave repair equipment includes:
the box body 1 is used for forming a closed space together with the soil surface;
the air inlet system is used for conveying air into the soil in the coverage area of the closed space;
the liquid inlet system is used for conveying a liquid repairing agent into soil in a coverage area of the closed space;
the microwave transmitting device is used for transmitting microwaves to the soil in the coverage area of the closed space;
the gas treatment system is used for extracting and treating gas in the closed space;
the air inlet system comprises an air injection pump 3 and an air inlet pipe communicated with the air injection pump 3, wherein an air inlet of the air injection pump 3 is positioned outside the closed space, the air inlet pipe is inserted into soil in a coverage area of the closed space, a plurality of air inlets are formed in the air inlet pipe, and the air inlets are all positioned in the soil in the coverage area of the closed space;
the liquid inlet system comprises a repairing agent storage tank 21 and a liquid inlet pipe communicated with the repairing agent storage tank through a centrifugal water pump 2, the liquid inlet pipe is inserted into the soil in the coverage area of the closed space, a plurality of liquid inlets are formed in the liquid inlet pipe, and the liquid inlets are all positioned in the soil in the coverage area of the closed space;
the gas treatment system comprises a gas suction pump 5 with a gas inlet positioned in the closed space and a gas purification system communicated with a gas outlet of the gas suction pump 5.
The in-situ microwave remediation equipment and method for organic contaminated soil provided by the embodiment have the beneficial effects that: the repairing agent storage tank 21 is used for storing the prepared soil repairing agent and injecting the soil repairing agent into the liquid inlet pipe through the centrifugal water pump 2; the air injection pump 3 sucks air from the outside and continuously injects the air into the soil through the air inlet pipe, so that the soil remediation agent and the air flow in the soil to bring out volatile organic pollutants; the microwave transmitting device 4 converts electric energy provided by the outside into microwaves, so that the soil is heated quickly and uniformly, the reaction between the soil and the repairing agent and the volatilization of pollutants are accelerated, and the desorption effect of volatile and semi-volatile organic pollutants in the soil is improved; the air pump 5 collects the volatile gas pollutants in the soil and sends the volatile gas pollutants into a subsequent gas purification system, so that the discharged gas meets the requirement of safe discharge. The equipment can improve the desorption effect of semi-volatile organic pollutants, can treat tail gas, and reduces the pollution of the tail gas generated by soil treatment to the atmosphere.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic matter contaminated soil, the gas-liquid pipeline 31 integrating the gas inlet pipe and the liquid inlet pipe into a whole can save the space occupied by the pipeline and ensure that the soil remediation agent is more uniformly distributed in the soil along with the flowing of air.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic matter contaminated soil, a fixing frame 11 is arranged in the box body 1, and the centrifugal water pump 2, the gas injection pump 3, the microwave emission device 4 and the air suction pump 5 are arranged on the fixing frame 11. The fixing frame 11 facilitates installation and fixation of each device and equipment.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic matter contaminated soil, the gas-liquid pipeline 31 is detachably connected with the gas injection pump 3, and when the in-situ microwave remediation equipment is used, the gas-liquid pipeline 31 can be inserted into the soil and then connected with the gas injection pump 3, so that the insertion position of the gas-liquid pipeline 31 can be selected and positioned more accurately.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic matter contaminated soil, the gas-liquid pipeline 31 is detachably connected with the remediation agent storage tank 21, and the gas-liquid pipeline 31 can be connected after being inserted into the gas-liquid pipeline 31 in the using process, so that the selection and the positioning of the insertion position of the gas-liquid pipeline 31 are easily and accurately realized.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic contaminated soil, the side wall of the box body 1 is provided with a box plate 12 which can be opened and closed, so that the gas-liquid pipeline 31 can be conveniently installed and connected.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic matter contaminated soil, the moving device 13 is arranged at the bottom of the box body 1, so that the box body 1 can be conveniently moved to the position above the soil of the area to be treated.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic contaminated soil, the moving device 13 is a rubber wheel, so that the equipment can be conveniently moved and can be prevented from slipping.
As a specific embodiment provided by the organic matter contaminated soil in-situ microwave remediation device, the gas purification system sequentially comprises a condenser 51, a gas absorption tank and a gas adsorption tank 54 which are communicated through a gas transmission pipeline along the gas transmission direction. The condenser 51 condenses the moisture and part of the organic matters pumped out by the air pump 5 to reduce the load of the subsequent absorption and adsorption device; the gas absorption tank is filled with a gas absorption reagent for absorbing and degrading the gas after condensation treatment; the gas adsorption tank 54 is used for further adsorbing the gas, so that the discharged gas meets the requirement of safe discharge.
As a specific embodiment provided by the in-situ microwave remediation device for organic contaminated soil according to the present invention, two gas absorption tanks are provided, namely, the first gas absorption tank 52 and the second gas absorption tank 53, and different gas absorption reagents are respectively placed in the two gas absorption tanks, so that tail gas can be effectively treated. As a specific embodiment provided by the in-situ microwave remediation device and method for organic contaminated soil of the present invention, the first gas absorption tank 52 is used for containing an alkaline sodium sulfide solution (pH is adjusted to alkaline with calcium hydroxide) for absorbing acidic gases; the second gas absorption tank 53 is used for containing an acidic potassium permanganate solution for oxidizing and degrading the volatilized organic pollutants.
As a specific embodiment provided by the in-situ microwave remediation device for organic contaminated soil according to the present invention, the gas adsorption tank 54 is filled with activated carbon, fly ash or diatomite for adsorbing gaseous pollutants that are not completely treated by the gas adsorption tank.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic matter contaminated soil, the in-situ microwave remediation equipment is further provided with a control system, and the signal output end of the control system is connected with the signal input ends of the centrifugal water pump 2, the gas injection pump 3, the microwave emission device 4 and the gas extraction pump 5 and is used for controlling the on/off and power of each device. The control panel 6 of the control system is arranged on the box body 1.
As a specific implementation mode provided by the in-situ microwave remediation equipment for the organic contaminated soil, the box body 1 and the box plate 12 are made of iron or aluminum, so that the effect of treating pollutants is prevented from being reduced or operators are prevented from being injured due to microwave leakage.
Example 2
The embodiment provides an in-situ microwave remediation method for organic matter contaminated soil, which is implemented by using the in-situ microwave remediation equipment for organic matter contaminated soil in the embodiment 1. The method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities such as masonry and the like in the soil;
s2, inserting the gas-liquid pipeline 31 into soil, moving the box body 1 to the position above the soil of the area to be repaired, and respectively connecting the repairing agent storage tank 21 connected with the centrifugal water pump 2 and the steam injection pump 3 with the gas-liquid pipeline 31;
s3, starting the centrifugal water pump 2, and adding a repairing agent and water into the soil to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and FeCl2、H2O2A mixture with a mass ratio of 25:1: 5; the repairing agent is 1/50 of soil quality; waiting for 30 minutes to ensure that the repairing agent and the organic pollutants are fully reacted;
s4, sealing the gap between the box body 1 and the soil by using rubber;
and S5, starting the air injection pump 3, the air suction pump 5 and the microwave transmitting device 4 on the control panel 6 through the control system, wherein the microwave frequency is 2400MHz, the microwave transmitting time is 20 minutes, and the microwave power is 5 kW.
Example 3
The embodiment provides an in-situ microwave remediation method for organic matter contaminated soil, which is implemented by using the in-situ microwave remediation equipment for organic matter contaminated soil in the embodiment 1. The method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities such as masonry and the like in the soil;
s2, inserting the gas-liquid pipeline 31 into soil, moving the box body 1 to the position above the soil of the area to be repaired, and respectively connecting the repairing agent storage tank 21 connected with the centrifugal water pump 2 and the steam injection pump 3 with the gas-liquid pipeline 31;
s3, starting the centrifugal water pump 2, and adding a repairing agent and water into the soil to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and FeCl2、H2O2The mass ratio of the mixture to the mixture is 25:1: 10; the repairing agent is 1/40 of soil quality; waiting for 30 minutes to ensure that the repairing agent and the organic pollutants are fully reacted;
s4, sealing the gap between the box body 1 and the soil by using rubber;
and S5, starting the air injection pump 3, the air suction pump 5 and the microwave transmitting device 4 on the control panel 6 through the control system, wherein the microwave frequency is 2400MHz, the microwave transmitting time is 20 minutes, and the microwave power is 8 kW.
Example 4
The embodiment provides an in-situ microwave remediation method for organic matter contaminated soil, which is implemented by using the in-situ microwave remediation equipment for organic matter contaminated soil in the embodiment 1. The method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities such as masonry and the like in the soil;
s2, inserting the gas-liquid pipeline 31 into soil, moving the box body 1 to the position above the soil of the area to be repaired, and respectively connecting the repairing agent storage tank 21 connected with the centrifugal water pump 2 and the steam injection pump 3 with the gas-liquid pipeline 31;
s3, starting the centrifugal water pump 2, and adding a repairing agent and water into the soil to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and FeCl2、H2O2A mixture with a mass ratio of 25:2: 5; the repairing agent is 1/50 of soil quality; waiting for 30 minutes to ensure that the repairing agent and the organic pollutants are fully reacted;
s4, sealing the gap between the box body 1 and the soil by using rubber;
and S5, starting the air injection pump 3, the air suction pump 5 and the microwave transmitting device 4 on the control panel 6 through the control system, wherein the microwave frequency is 2400MHz, the microwave transmitting time is 30 minutes, and the microwave power is 1 kW.
Example 5
The embodiment provides an in-situ microwave remediation method for organic matter contaminated soil, which is implemented by using the in-situ microwave remediation equipment for organic matter contaminated soil in the embodiment 1. The method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities such as masonry and the like in the soil;
s2, inserting the gas-liquid pipeline 31 into soil, moving the box body 1 to the position above the soil of the area to be repaired, and respectively connecting the repairing agent storage tank 21 connected with the centrifugal water pump 2 and the steam injection pump 3 with the gas-liquid pipeline 31;
s3, starting the centrifugal water pump 2, and adding a repairing agent and water into the soil to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and FeCl2、H2O2A mixture with a mass ratio of 25:2: 10; the repairing agent is 1/40 of soil quality; waiting for 30 minutes to ensure that the repairing agent and the organic pollutants are fully reacted;
s4, sealing the gap between the box body 1 and the soil by using rubber;
and S5, starting the air injection pump 3, the air suction pump 5 and the microwave transmitting device 4 on the control panel 6 through the control system, wherein the microwave frequency is 2400MHz, the microwave transmitting time is 10 minutes, and the microwave power is 10 kW.
Comparative example 1
The comparative example provides an in-situ microwave remediation method for organic matter contaminated soil, and the in-situ microwave remediation equipment for organic matter contaminated soil in the example 1 is used for remediation. The method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities such as masonry and the like in the soil;
s2, inserting the gas-liquid pipeline 31 into soil, moving the box body 1 to the position above the soil of the area to be repaired, and respectively connecting the repairing agent storage tank 21 connected with the centrifugal water pump 2 and the steam injection pump 3 with the gas-liquid pipeline 31;
s3, starting the centrifugal water pump 2, and adding a repairing agent and water into the soil to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and FeCl2、H2O2A mixture with a mass ratio of 25:1: 5; the repairing agent is 1/50 of soil quality; waiting for 30 minutes to ensure that the repairing agent and the organic pollutants are fully reacted;
s4, sealing the gap between the box body 1 and the soil by using rubber;
and S5, starting the air injection pump 3 and the air suction pump 5 on the control panel 6 through the control system.
Comparative example 2
The comparative example provides an in-situ microwave remediation method for organic matter contaminated soil, and the in-situ microwave remediation equipment for organic matter contaminated soil in the example 1 is used for remediation. The method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities such as masonry and the like in the soil;
s2, inserting the gas-liquid pipeline 31 into soil, moving the box body 1 to the position above the soil of the area to be repaired, and respectively connecting the repairing agent storage tank 21 connected with the centrifugal water pump 2 and the steam injection pump 3 with the gas-liquid pipeline 31;
s3, starting the centrifugal water pump 2, and adding water into the soil to enable the water content of the soil to be 20% -30%; waiting for 30 minutes;
s4, sealing the gap between the box body 1 and the soil by using rubber;
and S5, starting the air injection pump 3, the air suction pump 5 and the microwave transmitting device 4 on the control panel 6 through the control system, wherein the microwave frequency is 2400MHz, the microwave transmitting time is 20 minutes, and the microwave power is 5 kW.
The desorption efficiency for total petroleum hydrocarbons in examples 2 to 5 and comparative examples 1 and 2 are shown in table 1.
TABLE 1 efficiency of total petroleum hydrocarbon desorption for each of the examples and comparative examples
As can be seen from Table 1, the desorption efficiency of examples 2 to 5 on total petroleum hydrocarbon is obviously higher than that of comparative example 1 and comparative example 2, which shows that the soil remediation method by combining microwaves and remediation agents provided by the invention has a good remediation effect on organic contaminated soil.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The in-situ microwave remediation equipment for the organic matter contaminated soil is characterized in that: the method comprises the following steps:
the box body is used for forming a closed space together with the soil surface;
the air inlet system is used for conveying air into the soil of the coverage area of the closed space;
the liquid inlet system is used for conveying a liquid repairing agent into the soil in the coverage area of the closed space;
the microwave transmitting device is used for transmitting microwaves to the soil in the coverage area of the closed space;
the gas treatment system is used for extracting and treating gas in the closed space;
the air inlet system comprises an air injection pump and an air inlet pipe communicated with the air injection pump, an air inlet of the air injection pump is positioned outside the closed space, the air inlet pipe is inserted into soil in a coverage area of the closed space, a plurality of air inlets are formed in the air inlet pipe, and the air inlets are all positioned in the soil in the coverage area of the closed space;
the liquid inlet system comprises a repairing agent storage tank and a liquid inlet pipe communicated with the repairing agent storage tank through a centrifugal water pump, the liquid inlet pipe is inserted into the soil in the closed space coverage area, a plurality of liquid inlets are formed in the liquid inlet pipe, and the liquid inlets are all located in the soil in the closed space coverage area;
the gas treatment system comprises a suction pump with a gas inlet positioned in the closed space and a gas purification system communicated with a gas outlet of the suction pump.
2. The in-situ microwave remediation device for organic-contaminated soil as claimed in claim 1, wherein: the gas inlet pipe and the liquid inlet pipe are integrated into a gas-liquid pipeline; and/or
A fixing frame is arranged in the box body, and the centrifugal water pump, the air injection pump, the microwave transmitting device and the air extracting pump are arranged on the fixing frame; and/or
The air inlet pipe is detachably connected with the air injection pump; and/or
The liquid inlet pipe is detachably connected with the repairing agent storage tank; and/or
The side wall of the box body is provided with a box plate which can be opened and closed; and/or
The bottom of the box body is provided with a moving device; and/or
The gas purification system is sequentially provided with a condenser, a gas absorption tank and a gas absorption tank which are communicated through pipelines along the gas transmission direction.
3. The in-situ microwave remediation device for organic-contaminated soil as claimed in claim 2, wherein: the moving device is a rubber wheel.
4. The in-situ microwave remediation device for organic-contaminated soil as claimed in claim 2, wherein: the gas absorption tank is provided with a plurality of gas absorption tanks.
5. The in-situ microwave remediation device for organic-contaminated soil as claimed in claim 2, wherein: the gas adsorption tank is filled with activated carbon, fly ash or diatomite.
6. The in-situ microwave remediation device for organic-contaminated soil as claimed in claim 1, wherein: the in-situ microwave repair equipment is also provided with a control system, and the signal output end of the control system is connected with the signal input ends of the centrifugal water pump, the air injection pump, the microwave transmitting device and the air suction pump.
7. The in-situ microwave remediation device for organic-contaminated soil as claimed in any one of claims 1 to 6, wherein: the box body is made of iron or aluminum.
8. An in-situ microwave remediation method for organic contaminated soil is characterized by comprising the following steps: the organic matter contaminated soil in-situ microwave remediation equipment as claimed in any one of claims 1 to 7 is used for remediation.
9. The in-situ microwave remediation method of organic-contaminated soil as claimed in claim 8, wherein: the method specifically comprises the following steps:
s1, loosening the soil in the area to be repaired to enable the particle size of the soil to be less than 1.5cm, and removing impurities;
s2, covering the soil with the box body, and inserting the air inlet pipe and the liquid inlet pipe into the soil;
s3, starting the centrifugal water pump, and adding a repairing agent and water into the soil through a liquid inlet pipe to enable the water content of the soil to be 20% -30%; the repairing agent is citric acid and ferrous chloride (FeCl)2) Hydrogen peroxide (H)2O2) A mixture with a mass ratio of 25 (1-2) to 5-10; the repairing agent is 1/50-1/40 of the soil quality;
s4, closing a gap between the box body and the soil;
and S5, starting the air injection pump, the air suction pump and the microwave transmitting device.
10. The in-situ microwave remediation method of organic-contaminated soil as claimed in claim 9, wherein: the microwave frequency of the microwave transmitting device is 2400MHz, the microwave transmitting time is 10-30 minutes, and the microwave power is 1-10 kW.
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