CN115055504B - Microorganism leaching reaction device and soil restoration method - Google Patents
Microorganism leaching reaction device and soil restoration method Download PDFInfo
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- CN115055504B CN115055504B CN202210749346.6A CN202210749346A CN115055504B CN 115055504 B CN115055504 B CN 115055504B CN 202210749346 A CN202210749346 A CN 202210749346A CN 115055504 B CN115055504 B CN 115055504B
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
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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
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses a microorganism leaching reaction device and a soil restoration method, which are used for restoring soil to be restored after mixing with liquid, wherein the microorganism leaching reaction device comprises the following components: the device comprises a reaction tank, a reaction cavity, an aerator, a heating part, an air conveying part, a rectifying device and a spraying part; the reaction tank is transversely arranged and is internally provided with a containing cavity; the reaction cavity is arranged in the accommodating cavity and is communicated with the outlet of the aerator; the aerator is arranged along the transverse direction of the reaction tank, and receives an external air source of the reaction tank to convey air into the reaction cavity; the invention can be flexibly matched and combined according to different pollution types of the soil to be repaired so as to reduce the cost, and can be used for repairing the in-situ repair soil and the ectopic repair soil.
Description
Technical Field
The invention relates to the field of soil remediation equipment, in particular to a microorganism leaching reaction device and a soil remediation method.
Background
Various natural products, particularly organic substances, present in the environment are almost exclusively found as microorganisms which can degrade or transform them. Because of the characteristics of small individual microorganisms, rapid propagation, large specific surface and the like, the microorganisms are more easily adapted to the environment than other organisms, and can generate new strains through natural catastrophe to generate new enzyme systems with new metabolic functions.
Currently known environmental pollutants reach hundreds of thousands, of which are a large number of organic compounds that are subject to photodecomposition, chemical decomposition and biological decomposition, with biological decomposition being the dominant. The principle of the method is that under the conditions of adding energy source substances and aeration and oxygenation, the biological oxidation of thiobacillus and the like and the low pH environment generated by the biological oxidation are utilized to dissolve heavy metals existing in the polluted soil in a indissolvable form into a liquid phase, and then the aim of removing the heavy metals is achieved through solid-liquid separation. At present, a method for removing heavy metals in soil by adopting a bioleaching method is adopted, and most of devices used for the method in the early stage adopt a reaction kettle in a stirring mode, but the energy consumption is high.
The prior art CN2813632Y is composed of a reaction tower and a hot water circulation heating device, wherein a back flushing pipe, an aerator, an air lifting pipe and an umbrella-shaped air guide sleeve are arranged in the reaction tower from bottom to top. The method utilizes the air lifting function of rising air bubbles when the aerator bursts and inflates oxygen to carry out leaching on microorganisms under the condition of aerobic and uniform mixing to reduce the pH value of sludge, and heavy metals in the sludge are dissolved out to complete the biological leaching process of the heavy metals in the sludge. The method has poor effect on soil remediation, and because the solid matters in the soil are heavier than the sludge, the solid matters are not easy to blow by the aerator to be lifted to a preset height, so that the leaching process of the solid matters cannot be greatly displaced, the efficiency of the remediation process is low, and the effect of rapidly and efficiently remediating the soil to be remediated cannot be achieved.
Disclosure of Invention
In order to achieve the above object, the invention provides a microorganism leaching reaction device and a soil restoration method, in particular to a device capable of efficiently and rapidly restoring soil to be restored, which adopts the following technical scheme:
a microbial leaching reaction device for mixing soil to be remediated with a liquid for remediation, comprising: the reaction tank is transversely arranged and is internally provided with a containing cavity;
the reaction cavity is arranged in the accommodating cavity and is communicated with the outlet of the aerator;
the aerator is arranged along the transverse direction of the reaction tank, and receives an external air source of the reaction tank to convey air into the reaction cavity; at least one aerator is arranged along the longitudinal direction of the reaction tank and receives an external air source of the reaction tank to convey air into the reaction cavity; at least one of the aerator arranged transversely and the aerator arranged longitudinally is in a conveying state; the conveying flow of the aerator arranged longitudinally is larger than that of the aerator arranged transversely;
the heating parts are uniformly distributed on the periphery of the reaction cavity and are used for enabling the reaction cavity to reach a preset temperature;
an air conveying part which is arranged between the upper part of the reaction cavity and the accommodating cavity and is communicated with the reaction cavity; the air conveying part is used for conveying the gas generated after the reaction in the reaction cavity to the outside of the reaction tank;
the rectifying device is arranged between the reaction cavity and the accommodating cavity and is communicated with the air conveying part; the mixing agent for receiving and guiding the soil to be remediated and the liquid flows into the reaction cavity;
and the spraying part is arranged on the reaction tank, and the spraying area of the spraying part is positioned above the rectifying device and is used for spraying and repairing the mixture of the soil to be repaired and the liquid.
Further:
the aerator comprises a transverse aerator and a longitudinal aerator;
the transverse aerators are respectively arranged at two ends of the reaction cavity; at least one longitudinal aerator is arranged in the middle of the reaction cavity.
Further:
the reaction cavity is a cavity body formed along the length direction of the accommodating cavity, and two ends of the reaction cavity
The device is provided with a feeding hole respectively, and the feeding holes are used for conveying the mixture of the soil to be repaired and the liquid into the reaction cavity;
one end of the reaction cavity, which faces the aerator, is provided with a gradually expanding conical end.
Further:
the air conveying part comprises an air conveying main path and a plurality of air conveying auxiliary paths;
the air conveying main path is arranged above the corresponding aerator and is used for collecting the gas output by the longitudinal aerator;
the air conveying auxiliary paths are positioned at two sides of the air conveying main path and are used for collecting the gas output by the longitudinal aerator and the transverse aerator.
Further:
the rectifying device comprises at least one main rectifying device communicated with the air conveying main path and at least one auxiliary rectifying device communicated with the air conveying auxiliary path;
the main rectifying device and the auxiliary rectifying device comprise a first rectifying part communicated with the air conveying part and a second rectifying part communicated with the first rectifying part; the second rectifying part is fixedly arranged above the first rectifying part and is led to the outside of the reaction tank.
Further:
the first rectifying part comprises a main conical table which is fixedly arranged above the air conveying main road and gradually expands downwards, and an auxiliary conical table which is fixedly arranged above the air conveying auxiliary road and gradually expands towards the main conical table; the second rectifying part comprises a main guide table fixedly arranged above the main conical table and a secondary guide table fixedly arranged above the secondary conical table.
Further:
the spraying part comprises at least one nozzle corresponding to the main conical table and the auxiliary conical table and a repairing material box for conveying repairing agent to the nozzle.
Further:
the air conveying auxiliary path is communicated with the air conveying main path and is discharged through the air conveying main path.
Further:
the device also comprises an air compressor arranged outside the reaction tank and used for providing air sources for the transverse aerator and the longitudinal aerator, and an air regulating device arranged in an air path between the air compressor and the aerator.
The invention also provides a soil remediation method of the microorganism leaching reaction device, which comprises the following steps:
step one: mixing soil to be repaired with liquid according to a certain proportion, and then delivering the mixture into a reaction cavity through a feed inlet;
step two: putting a microbial and sulfur powder mixed microbial agent into a repairing feed box of the spraying part;
step three: starting an air compressor, and delivering air into an air delivery part in the form of bubbles after the air compressor delivers the air to the aerator;
step four: the polluted soil and water mixture is carried by air bubbles to rise to the air conveying part, flows into the reaction cavity after being rectified by the first rectifying part and the second rectifying part, is uniformly dispersed to the reaction cavity and naturally descends after being conveyed to the rectifying device by the air conveying part;
step five: the air located in the air conveying part is oxidized and heated, so that the air is conveyed from the air conveying part to the tail gas treatment device; simultaneously, the contaminated soil and water mixture outside the reaction cavity are flushed into the reaction cavity;
step six: and (3) flushing the polluted soil and water mixture into the air conveying part by the aerator again, and repeating the step four and the step five until the measured pH value of the polluted soil and water mixture is less than 3.
Compared with the prior art, the invention has the following beneficial effects:
1. the microbial leaching reaction device disclosed by the invention is characterized in that the longitudinal and transverse aerators are arranged on the transversely arranged reaction tank, the mixture containing soil and liquid to be repaired is oxygenated simultaneously or independently, the air flow of the aerators forms impact convection in the transverse and longitudinal directions in the reaction cavity, the transversely-entered oxygen can fully react and decompose organic pollutants in the reaction cavity, and the air and the mixture can be quickly pushed and conveyed to the air conveying part through the longitudinal aerators arranged at a flow rate greater than that of the transverse aerators, and the air heated by the heating part flows out along the air conveying part, so that the mixture outside the reaction cavity is flushed into the reaction cavity again for reaction.
2. The microbial leaching reaction device is provided with 1 air conveying main path and 10 air conveying auxiliary paths, and the gas output by the longitudinal aerator is mainly output through the air conveying main path, and the mixture is carried to rise upwards along with the air conveying main path in the output process. When the pressure of the middle air conveying main path is small, air carrying mixture conveyed by the plurality of transverse aerators flows into the upper part of the middle longitudinal aerators from two side surfaces, and the air moving transversely and part of the mixture carried by the air moving transversely are carried upwards through the air conveying auxiliary path due to the air flow impact of the transverse aerators and the longitudinal aerators. The reaction repair speed of microorganisms and organic pollutants is accelerated.
3. According to the microorganism leaching reaction device, the auxiliary conical table is a conical table which is formed by connecting large bosses or small bosses and gradually expands upwards, and is used for receiving the mixture used in the large bosses or the small bosses, and part of the mixture is impacted to upwards surge and is blocked by the auxiliary flow guiding table positioned above; part of the mixture flows into the reaction cavity after flowing to the main conical table along the main flow guiding table after passing through the round hole. In the process that the mixture flows to the auxiliary diversion table after passing through the main diversion table, a nozzle above the main diversion table sprays out the microbial and sulfur powder mixed microbial inoculum, so that the mixture is fully mixed with the microbial and sulfur powder mixed microbial inoculum, and then the microbial and sulfur powder mixed microbial inoculum is mixed into the reaction cavity for reaction and domestication, and the microbial and sulfur powder mixed microbial inoculum fully contacts with the mixed microbial inoculum and enters the reaction cavity for reaction and circulation.
4. The microorganism leaching reaction device adopts a modularized design, and can be flexibly matched and combined according to different soil pollution types to be repaired so as to reduce the cost. Can be used for repairing in-situ repair soil and ectopic repair soil.
Drawings
FIG. 1 is a schematic structural diagram of a microorganism leaching reaction device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a mounting structure of a rectifying device and a spraying part according to a first embodiment of the present invention;
FIG. 3 is a schematic view of an installation structure of a rectifying device according to a first embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a first embodiment of the present invention;
fig. 5 is a schematic perspective view of a rectifying device according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a microorganism leaching reaction device according to a second embodiment of the present invention.
In the drawings: 1. a reaction tank; 2. an aerator; 3. a rectifying device; 4. an air delivery unit; 5. a feed inlet; 6. a reaction chamber; 7. an air compressor; 8. an air regulating device; 9. a heating section; 10. a spraying part; 21. a lateral aerator; 22. a longitudinal aerator; 41. an air delivery main; 42. an air delivery auxiliary road; 43. a tail gas treatment device; 31. a first rectifying unit; 32. a second rectifying unit; 311. a main conical table; 312. an auxiliary conical table; 321. a main diversion table; 322. an auxiliary diversion table; 101. repairing the feed box; 102. and (3) a nozzle.
Detailed Description
The technical scheme of the patent is further described in detail below with reference to the specific embodiments.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a number" is two or more, unless explicitly defined otherwise.
And selecting a chemical industry field with the characteristics of the combined pollution field, carrying out field investigation work, knowing the hydrogeological conditions, the pollutant types, the concentration and the like of the field, selecting soil with corresponding pollution characteristics (heavy metal combined pollution and organic-inorganic combined pollution) and groundwater, and carrying out engineering application research by combining solidification/stabilization and chemical oxidation agent research. Because the polluted soil is solid, the polluted soil and water are required to be fully stirred and mixed according to a certain proportion before restoration, and then the mixture is conveyed into the microorganism leaching reaction equipment.
As shown in fig. 1 to 5, the present invention relates to a microorganism leaching reaction device for mixing soil to be remediated with liquid for remediation, the microorganism leaching reaction device comprising a reaction tank 1, an aerator 2, a reaction chamber 6, a heating part 9, an air conveying part 4, a rectifying device 3 and a spraying part 10; wherein, the reaction tank 1 is transversely arranged and is internally provided with a containing cavity; the reaction cavity 6 is arranged in the accommodating cavity and is communicated with the outlet of the aerator 2; the aerators 2 are arranged along the transverse direction of the reaction tank 1, and at least one aerator 2 receives an external air source of the reaction tank 1 to convey air into the reaction cavity 6; at least one aerator 2 is arranged along the longitudinal direction of the reaction tank 1 and receives an air source outside the reaction tank 1 to convey air into the reaction cavity 6; at least one of the horizontally arranged aerator 2 and the longitudinally arranged aerator 2 is in a conveying state, and the conveying flow of the longitudinally arranged aerator 2 is larger than that of the horizontally arranged aerator 2; an air delivery part 4, which is arranged between the upper part of the reaction chamber 6 and the accommodating chamber and is communicated with the reaction chamber 6, wherein the air delivery part 4 is used for delivering the gas generated after the reaction in the reaction chamber 6 to the outside of the reaction tank 1; a rectifying device 3 arranged between the reaction chamber 6 and the accommodating chamber and communicated with the air conveying part 4; the mixing agent for receiving and guiding the soil to be remediated and the liquid flows into the reaction chamber 6; the spraying part 10 is arranged on the reaction tank 1, and the spraying area of the spraying part 10 is positioned above the rectifying device 3 and is used for spraying and repairing the mixture of the soil to be repaired and the liquid.
The microbial leaching reaction device of the embodiment is characterized in that the longitudinal and transverse aerators 2 are arranged on the transversely arranged reaction tank 1, the mixture containing soil to be repaired and liquid is oxygenated simultaneously or independently, the air flow of the aerators 2 forms impact convection in the transverse and longitudinal directions in the reaction cavity 6, the transversely entered oxygen can fully react and decompose organic pollutants in the reaction cavity 6, and the air and the mixture can be quickly pushed and conveyed to the air conveying part 4 through the longitudinal aerators 2 which are arranged at a flow rate greater than that of the transverse aerators 2, and the air heated by the heating part 9 flows out along the air conveying part 4, so that the mixture outside the reaction cavity 6 is flushed into the reaction cavity 6 for reaction.
In addition, the rectifying device 3 can conduct graded dispersion on the rising mixture with a short distance, and meanwhile, the spraying part 10 sprays and washes the mixture which is being dispersed, and then the mixture is guided by the rectifying device 3 to enter the reaction cavity 6 again. The double repair processes inside and outside the reaction chamber 6 are realized, so that the repair efficiency is accelerated, and the problem that the efficiency of the repair process is low because the leaching process cannot be caused to generate larger displacement in the existing structure can be avoided.
Based on the above overall description, as an exemplary structure in this embodiment, as shown in fig. 1 to 2, the reaction chamber 6 is a rectangular chamber formed along the length direction of the accommodating chamber, and is connected with the upper end of the reaction tank 1 to form a closed space, the rectifying device 3 is disposed in the closed space, two ends of the reaction chamber 6 are respectively provided with a feed inlet 5, and the feed inlet 5 is used for conveying the mixture of the soil to be repaired and the liquid into the reaction chamber 6; the reaction chamber 6 is provided with a tapered end which gradually enlarges toward one end of the aerator. The mixture circulates only in the above-mentioned closed space and the reaction chamber 6. To facilitate the blowing of the gas in the aerator into the reaction chamber 6. The mixture of soil to be remediated and liquid is hereinafter referred to collectively as a mixture. Of course, in other embodiments, the reaction chamber 6 may be provided as a circular or other shaped chamber.
In addition, the heating part 9 is specifically a waterproof heating wire and is wound outside the reaction chamber 6, a temperature sensor can be arranged in the reaction chamber 6, and the temperature of the reaction tank 1 is controlled by a temperature controller, so that the temperature of the reaction tank 1 is kept at the most suitable temperature for microbial reaction at all times. In other embodiments, a control system may be added to control the following parameters: the solid-liquid ratio of the soil and the water, the optimal aeration rate, the proper temperature, the selection and the addition amount of the microbial agent, and the treated soil is utilized as resources.
Further, the aerator includes a lateral aerator 21 and a longitudinal aerator 22; the transverse aerators 21 are respectively arranged at two ends of the reaction cavity 6; at least one of the longitudinal aerators 22 is provided in the middle of the reaction chamber 6. In particular, as shown in fig. 1, one longitudinal aerator 22 is provided in this embodiment, and a plurality of longitudinal aerators 22 may be provided in other embodiments.
The air delivery unit 4 of the present embodiment includes an air delivery main path 41 and an air delivery auxiliary path 42; the air delivery main 41 is provided above the corresponding longitudinal aerator 22 for collecting the gas outputted from the longitudinal aerator 22; the air-conveying auxiliary paths 42 are located at both sides of the air-conveying main path 41 for collecting the gas output from the longitudinal aerators 22 and the lateral aerators 21.
In particular, as shown in fig. 1, the air delivery main path 41 includes a large boss protruding upward from the inside of the reaction chamber 6, and the large boss is located directly above the longitudinal aerator 22. The air delivery auxiliary 42 includes a small boss formed above the reaction chamber 6 from the inside of the reaction chamber 6, the small boss having a smaller diameter than the large boss. And be formed with the holding chamber of intercommunication reaction chamber 6 and run through the big boss export of big boss upper end on big boss, be formed with the holding chamber of intercommunication reaction chamber 6 and run through the little boss export of little boss upper end on little boss, export outside to retort 1 again after little boss export is linked together big boss export, because microorganism and hydrocarbon organic matter reaction do not have harmful gas to discharge, so do not need to communicate with tail gas treatment device 43, if contain harmful gas after the reaction then need communicate air transportation main circuit 41 export to tail gas treatment device 43. In this embodiment, 1 air delivery main path 41 and 10 air delivery auxiliary paths 42 are provided, and the air output from the longitudinal aerator 22 is mainly output through the air delivery main path 41, and the carrying mixture is upwards gushed along with the air delivery main path 41 in the output process. When the pressure of the middle air-conveying main path 41 is small, the air-carrying mixture conveyed by the plurality of transverse aerators 21 is flushed from both sides into the middle above the longitudinal aerators 22, and the air moving transversely and the part of the mixture carried by the air-carrying mixture are flushed upwards through the air-conveying auxiliary path 42 due to the air flow impact of the transverse aerators 21 and the longitudinal aerators 22. The reaction repair speed of microorganisms and organic pollutants is accelerated.
The rectifying device 3 of the present embodiment includes at least one main rectifying device 3 connected to the air conveying main path 41 and at least one auxiliary rectifying device 3 connected to the air conveying auxiliary path 42; the main rectifying device 3 and the auxiliary rectifying device 3 each include a first rectifying portion 31 communicated with the air conveying portion 4 and a second rectifying portion 32 communicated with the first rectifying portion 31; the second rectifying portion 32 is fixedly installed above the first rectifying portion 31 and is led to the outside of the reaction tank 1. As a preferred embodiment, as shown in fig. 4 and 5, the first rectifying portion 31 includes a main tapered stage 311 which is fixedly provided above the air conveying main path 41 and gradually expands downward, and an auxiliary tapered stage 312 which is fixedly provided above the air conveying auxiliary path 42 and gradually expands toward the main tapered stage 311; the second rectifying portion 32 includes a main flow guiding stage 321 fixed above the main tapered stage 311 and an auxiliary flow guiding stage 322 fixed above the auxiliary tapered stage 312. In this embodiment, the main flow guiding platform 321 and the auxiliary flow guiding platform 322 are two surfaces of the same cone frustum, the main flow guiding platform 321 is an outer cone of the cone frustum, and the auxiliary flow guiding platform 322 is an inner cone of the cone frustum. The circular truncated cone is provided with a plurality of circular holes penetrating the wall thickness, and the reaction chamber 6 is provided with a plurality of holes for discharging the mixture corresponding to the main truncated cone 311. Of course, in other embodiments, the main flow stage 321 and the auxiliary flow stage 322 may be two different parts.
Furthermore, the shower section 10 includes at least one nozzle 102 provided corresponding to the main taper stage 311 and the sub taper stage 312, and a repairing tank 101 that delivers a repairing agent to the nozzle 102. In this embodiment 12 nozzles 102 are provided above the primary cone 311 and the secondary cone 312. The repairing bin 101 is internally provided with a microbial and sulfur powder mixed microbial agent.
In this embodiment, the auxiliary conical table 312 is a conical table formed by connecting large bosses or small bosses, which gradually expands upwards, and receives the mixture used in the large bosses or the small bosses, and part of the mixture is impacted upwards and blocked by the auxiliary flow guiding table 322 positioned above; part of the mixture flows through the round hole, then flows along the main flow guiding table 321 to the main conical table 311, and then flows into the reaction chamber 6. In the process that the mixture passes through the main diversion table 321 and then flows to the auxiliary diversion table 322, the nozzle 102 above the main diversion table sprays the microbial and sulfur powder mixed microbial inoculum, so that the mixture is fully mixed with the microbial and sulfur powder mixed microbial inoculum, and then the microbial and sulfur powder mixed microbial inoculum is mixed into the reaction chamber 6 for reaction and domestication, and the microbial and sulfur powder mixed microbial inoculum fully contacts with the mixed microbial inoculum and then enters the reaction chamber 6 for reaction and circulation. The mixture is lifted and lowered in the reaction tank 1 and then lifted, aeration is controlled in the implementation process, the concentration of dissolved oxygen is guaranteed, microorganisms can play an oxidation role to decompose organic pollutants in soil, meanwhile, sulfur powder can be oxidized into sulfate by the microorganisms, heavy metals in the soil are dissolved out, and the leaching process is completed.
The microorganism washing reaction apparatus of the present embodiment further includes an air compressor 7 provided outside the reaction tank 1 to supply an air source to the lateral aerator 21 and the longitudinal aerator 22, and an air regulating device 8 provided in an air path between the air compressor 7 and the aerator. The gas adjusting device 8 is specifically an adjustable rotor gas meter, and can adjust the gas amounts of the transverse aerator 21 and the longitudinal aerator 22 so as to adjust the reaction effect of the mixture.
The repairing method of the microorganism leaching reaction device of the embodiment comprises the following steps:
step one: mixing soil to be repaired with liquid according to a certain proportion, and then delivering the mixture into a reaction cavity 6 through a feed inlet 5;
step two: putting a microbial and sulfur powder mixed microbial agent into a repairing feed box 101 of the spraying part 10;
step three: starting the air compressor 7, and after the air compressor 7 conveys the air to the aerator, conveying the air into the air conveying part 4 in the form of bubbles;
step four: the polluted soil and water mixture is carried by air bubbles to rise to the air conveying part 4, flows into the reaction cavity 6 after being rectified by the first rectifying part 31 and the second rectifying part 32, is uniformly dispersed to the reaction cavity 6 after being carried to the rectifying device 3 by the air conveying part 4 and naturally descends;
step five: the air in the air delivery unit 4 is oxidized and heated, so that the air is delivered from the air delivery unit 4 to the exhaust gas treatment device 43; at the same time, the mixture of the polluted soil and the water outside the reaction chamber 6 is flushed into the reaction chamber 6;
step six: and (3) flushing the polluted soil and water mixture into the air conveying part 4 by the aerator again, and repeating the step four and the step five until the measured pH value of the polluted soil and water mixture is less than 3.
The microbial leaching reaction device of the embodiment ensures that materials are lifted and lowered in the reaction tank 1 and then lifted by arranging the transverse aerator 21 and the longitudinal aerator 22, the aeration is controlled in the implementation process, the concentration of dissolved oxygen is ensured, microorganisms can play an oxidation role to decompose organic pollutants in soil, and meanwhile, sulfur powder can be oxidized into sulfate by the microorganisms to dissolve heavy metals in the soil, so that the leaching process is completed.
Example two
As shown in fig. 6, in this embodiment, three longitudinal aerators 22 are used, and an adjustable rotor gasometer is arranged on the pipeline between each aerator and the air compressor 7, so that the soil with high pollution degree can be repaired, and the effect of accelerating the reaction speed is achieved. Of course, only one of the longitudinal aerators 22 may be used for soil remediation with low contamination.
The above described embodiments are only preferred examples of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications thereof, which would be apparent to those skilled in the art without departing from the principles and spirit of the present invention, should be considered to be within the scope of the appended claims.
Claims (10)
1. A microbial leaching reaction device for mixing soil to be remediated with a liquid and then remediating the soil, comprising:
the reaction tank (1), the said reaction tank (1) is set up transversely, and form the holding cavity in it;
a reaction chamber (6) arranged in the accommodating chamber and communicated with the outlet of the aerator;
the aerator (2), at least one aerator (2) is arranged along the transverse direction of the reaction tank (1) and receives an external air source of the reaction tank (1) to convey air into the reaction cavity (6); at least one aerator (2) is arranged along the longitudinal direction of the reaction tank (1) and receives an external air source of the reaction tank (1) to convey air into the reaction cavity (6); at least one of the aerator (2) which is arranged transversely and the aerator (2) which is arranged longitudinally is in a conveying state, and the conveying flow of the aerator (2) which is arranged longitudinally is larger than that of the aerator (2) which is arranged transversely;
the heating parts (9) are uniformly distributed on the periphery of the reaction cavity (6) and are used for enabling the reaction cavity (6) to reach a preset temperature;
an air delivery unit (4) which is provided between the upper part of the reaction chamber (6) and the accommodation chamber and communicates with the reaction chamber (6); the air conveying part (4) is used for conveying the gas generated after the reaction in the reaction cavity (6) to the outside of the reaction tank (1);
a rectifying device (3) which is arranged between the reaction cavity (6) and the accommodating cavity and is communicated with the air conveying part (4); the mixing agent for receiving and guiding the soil to be remediated and the liquid flows into the reaction cavity (6);
the spraying part (10) is arranged on the reaction tank (1), and a spraying area of the spraying part (10) is positioned above the rectifying device (3) and is used for spraying and repairing the mixture of the soil to be repaired and the liquid.
2. A microbial leaching reactor according to claim 1, wherein:
the aerator (2) comprises a transverse aerator (21) and a longitudinal aerator (22);
the transverse aerators (21) are respectively arranged at two ends of the reaction cavity (6); at least one longitudinal aerator (22) is arranged in the middle of the reaction cavity (6).
3. A microbial leaching reactor according to claim 2, wherein:
the reaction cavity (6) is a cavity body formed along the length direction of the accommodating cavity, and two ends of the reaction cavity (6)
The device is respectively provided with a feed inlet, and the feed inlets are used for conveying the mixture of the soil to be repaired and the liquid into the reaction cavity (6);
the reaction chamber (6) is provided with a tapered end which gradually expands towards one end of the aerator.
4. A microbial leaching reactor according to claim 1, wherein:
the air conveying part (4) comprises an air conveying main path (41) and a plurality of air conveying auxiliary paths (42);
the air conveying main path (41) is arranged above the corresponding longitudinal aerator (22) and is used for collecting the gas output by the longitudinal aerator (22);
the air conveying auxiliary paths (42) are positioned at two sides of the air conveying main path (41) and are used for collecting the gas output by the longitudinal aerator (22) and the transverse aerator (21).
5. A microbial leaching reactor according to claim 1, wherein:
the rectifying device (3) comprises at least one main rectifying device (3) communicated with the air conveying main path (41) and at least one auxiliary rectifying device (3) communicated with the air conveying auxiliary path (42);
the main rectifying device (3) and the auxiliary rectifying device (3) comprise a first rectifying part (31) communicated with the air conveying part (4) and a second rectifying part (32) communicated with the first rectifying part (31); the second rectifying part (32) is fixedly arranged above the first rectifying part (31) and is led to the outside of the reaction tank (1).
6. The microbial leaching reactor apparatus according to claim 5, wherein:
the first rectifying part (31) comprises a main conical table (311) which is fixedly arranged above the air conveying main path (41) and gradually expands downwards, and an auxiliary conical table (312) which is fixedly arranged above the air conveying auxiliary path (42) and gradually expands towards the main conical table (311); the second rectifying part (32) comprises a main guide table (321) fixedly arranged above the main conical table (311) and an auxiliary guide table (322) fixedly arranged above the auxiliary conical table (312).
7. A microbial leaching reactor according to claim 6, wherein:
the spraying part (10) comprises at least one nozzle (102) arranged corresponding to the main conical table (311) and the auxiliary conical table (312) and a repairing bin (101) for conveying repairing agent to the nozzle (102).
8. A microbial leaching reactor according to claim 1, wherein:
the air delivery auxiliary passage (42) communicates with the air delivery main passage (41) and is discharged through the air delivery main passage (41).
9. A microbial leaching reactor according to claim 2, wherein:
the device also comprises an air compressor (7) which is arranged outside the reaction tank (1) and used for providing air sources for the transverse aerator (21) and the longitudinal aerator (22), and an air regulating device (8) which is arranged in an air path between the air compressor (7) and the aerator.
10. A microbial leaching apparatus and repair method according to any one of claims 1 to 9, comprising the steps of:
step one: mixing soil to be repaired with liquid according to a certain proportion, and then delivering the mixture into a reaction cavity (6) through a feed inlet;
step two: putting a microbial and sulfur powder mixed microbial agent into a repairing feed box (101) of the spraying part (10);
step three: starting an air compressor (7), and after the air compressor (7) conveys the air to the aerator, conveying the air into the air conveying part (4) in the form of bubbles;
step four: the polluted soil and water mixture is carried by air bubbles to rise to the air conveying part (4), flows into the reaction cavity (6) after being rectified by the first rectifying part (31) and the second rectifying part (32), is carried to the rectifying device (3) by the air conveying part (4), and is uniformly dispersed to the reaction cavity (6) and naturally descends;
step five: the air located in the air conveying part (4) is oxidized and heated, so that the air is conveyed from the air conveying part (4) to the tail gas treatment device (43); simultaneously, the contaminated soil and water mixture outside the reaction cavity (6) is flushed into the reaction cavity (6);
step six: and (3) flushing the polluted soil and water mixture into the air conveying part (4) by the aerator again, and repeating the fourth step and the fifth step until the measured pH value of the polluted soil and water mixture is less than 3.
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