CN109821872B - System for treating polluted soil based on leaching method and treatment method - Google Patents
System for treating polluted soil based on leaching method and treatment method Download PDFInfo
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- CN109821872B CN109821872B CN201910183192.7A CN201910183192A CN109821872B CN 109821872 B CN109821872 B CN 109821872B CN 201910183192 A CN201910183192 A CN 201910183192A CN 109821872 B CN109821872 B CN 109821872B
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Abstract
The invention discloses a system for treating polluted soil based on a leaching method and a treatment method, and the system comprises a first crushing device, a granulating device, a leaching device, a second crushing device and an incinerating device, wherein the first crushing device, the granulating device, the leaching device, the second crushing device and the incinerating device are sequentially connected, the incinerating device is provided with an incinerating cavity and a drying cavity, the incinerating cavity is provided with an incinerating air outlet, the drying cavity is provided with a drying air outlet, and the drying air outlet is connected with a tail gas recovery and treatment device. The system for treating the polluted soil based on the leaching method and the treatment method can reduce the consumption of the leaching solution.
Description
Technical Field
The invention relates to the field of soil pollution treatment, in particular to a system and a method for treating polluted soil based on a leaching method.
Background
With the development of economy and society in China, soil pollution in China is increasingly serious, and the soil pollution refers to the phenomenon that harmful and toxic substances entering soil exceed the self-cleaning capacity of the soil, so that the physical, chemical and biological properties of the soil are changed, the yield of crops is reduced, and the health of human bodies is harmed. In this year, with the increasing importance of our country on environmental pollution, soil treatment solutions are gradually increasing on schedule. Common methods for treating soil pollution include bioremediation, leaching, additional application of organic fertilizer, and the like. Leaching refers to a technique for dissolving, separating and treating contaminants from soil by injecting a chemical solvent that promotes the dissolution or migration of the contaminants in the soil into the contaminated soil. The soil leaching is divided into in-situ leaching and ex-situ leaching, the in-situ leaching easily causes secondary pollution to the soil, and the method is suitable for the land with small pollution area. Ectopic leaching requires transferring the soil to be treated and repairing the soil in the transferring process. When the contaminated soil area is too large, more leacheate needs to be consumed, so that a device capable of ensuring the soil leaching effect and reducing the consumption of the leacheate as much as possible is needed.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a system and a method for treating polluted soil based on a leaching method, so as to reduce the consumption of a leaching solution.
The technical scheme is as follows: in order to achieve the purpose, the system for treating the polluted soil based on the leaching method comprises a first crushing device, a granulating device, a leaching device, a second crushing device and an incinerating device, wherein the first crushing device, the granulating device, the leaching device, the second crushing device and the incinerating device are sequentially connected, the incinerating device is provided with an incinerating cavity and a drying cavity, the incinerating cavity is provided with an incinerating air outlet, the drying cavity is provided with a drying air outlet, and the drying air outlet is connected with a tail gas recovery and treatment device.
Further, the granulating device comprises a frame body, a first baffle, a second baffle, a first push plate and a second push plate; the frame body is provided with a feed port, an accommodating cavity is arranged below the feed port and is a through cavity, the first baffle and the second baffle are fixedly embedded at two sides of the accommodating cavity, a gap is reserved between the first baffle and the second baffle, and the gap is arranged below the feed port;
a plurality of first forming holes are formed in the first baffle and the second baffle, and the first forming holes are through holes; the first push plate is provided with a plurality of first forming columns, the second push plate is provided with a plurality of second forming columns, the first forming columns are connected to first forming holes in the first baffle in a sliding mode, and the second forming columns are connected to first forming holes in the second baffle in a sliding mode.
Furthermore, a material collecting groove is arranged between the second push plate and the second baffle plate, the material collecting groove is arranged below the second push plate and the second baffle plate, the length of the first forming column is greater than that of the second forming column, the first forming column can slide into the first forming hole of the second baffle plate from the first forming hole of the first baffle plate, and the second forming column is pushed out of the second baffle plate;
conical counterbores are arranged on the opposite surfaces of the first baffle plate and the second baffle plate, and the counterbores are opposite to the first forming holes one by one;
the ends of the first forming column and the second forming column are provided with semicircular second forming holes.
Further, the both sides of framework are provided with the otic placode, one of them side swivelling joint has the nut on the otic placode, and the cover is equipped with slide bearing on the opposite side otic placode, be provided with polished rod and lead screw in first push pedal and the second push pedal, the lead screw is connected with the nut cooperation, the polished rod is connected with the linear bearing cooperation.
Furthermore, the first crushing device/the second crushing device comprises a first crushing box body, a second crushing box body and two crushing rollers which rotate relatively, the two crushing rollers which rotate relatively are rotatably connected inside the first crushing box body, the second crushing box body is sleeved on the top of the first crushing box body and is arranged above the crushing rollers, a second crushing outlet is arranged at the bottom of the second crushing box body, and the second crushing outlet is arranged above the mutual occlusion of the two crushing rollers;
a first crushing outlet is formed in the bottom of the first crushing box body, the first crushing outlet is a plurality of concentric fan-shaped rings, a baffle is rotatably connected to the bottom of the first crushing outlet, and the baffle is a plurality of concentric fan-shaped rings;
the outer surface cover of crushing roller is equipped with the protective sheath.
Furthermore, the leaching device comprises a leaching box body, a partition plate is arranged in the leaching box body, the inner cavity of the leaching box body is divided into an upper cavity and a lower cavity by the partition plate, a plurality of leaching cloth bags are arranged in the lower cavity, two ends of each leaching cloth bag are fixedly connected to the partition plate and a bottom plate of the leaching box body respectively, the inner cavity of each leaching cloth bag is communicated with the upper cavity, the lower cavity is provided with a leaching liquid inlet and a leaching liquid outlet, the leaching liquid inlet is formed in the top of the lower cavity, the leaching liquid outlet is formed in the bottom of the lower cavity, a baffle plate is connected to the lower side of the leaching box body in a sliding mode, a collecting tank is arranged at the bottom of the baffle plate, and the bottom of the collecting tank shrinks towards the center.
Further, the incineration device comprises an incineration outer cylinder, an incineration inner cylinder, a feeding rod and a rack, the incineration outer cylinder is fixedly connected with the rack, the incineration outer cylinder is coated outside the incineration inner cylinder, the feeding rod extends into the incineration inner cylinder, the incineration outer cylinder and the feeding rod are respectively in rotary connection with the incineration inner cylinder, a plurality of stirring blades are connected to the inner wall of the incineration inner cylinder, the stirring blades are spiral, and one end of the incineration inner cylinder is provided with a soil outlet;
an incineration cavity is formed between the incineration outer cylinder and the incineration inner cylinder, the incineration cavity is communicated with an incineration air outlet, an inner cavity of the incineration inner cylinder forms a drying cavity, and the drying air outlet is communicated with the drying cavity;
further, the feed rod is the cavity of right angle shape, the one end of feed rod is provided with feed hopper, the other end of feed rod is provided with the discharge gate, the discharge gate extends to in the dry chamber.
A leaching agent, which comprises 2% ammonium nitrate solution with the concentration of 0.1 mol/L; 1% ammonium dihydrogen phosphate with the concentration of 0.15 mol/L; 2.5 percent of ammonium oxalate solution with the concentration of 0.1mol/L, and the balance of water.
A method for treating polluted soil based on a leaching method comprises the following steps:
(S1) introducing the soil to be treated into a first crushing device, crushing the soil to be treated by the crushing roller, accumulating the crushed soil at the bottom of a first crushing box body, and then rotating a baffle plate to introduce the soil therein into a granulating device;
(S2) the crushed soil enters the accommodating cavity from the feeding hole of the granulating device and is placed in a gap between the first baffle plate and the second baffle plate, at the moment, the first forming column is completely retracted into the first forming hole of the first baffle plate, the second forming column is completely retracted into the second forming hole of the second baffle plate, then the first push plate moves, the first forming column pushes the soil between the gaps into the first forming hole of the second push plate until the second forming column is completely pushed out of the second push plate, the bulk polluted soil is made into a spherical shape, the spherical soil is made to fall into the collecting groove, and then the soil is transferred into the leaching device;
(S3) adding the leaching agent according to claim 9 to the leaching device, leaching, then drawing out the striker plate, and allowing the soil in the leaching cloth bag to fall into the feeding box and then transferring to the second crushing device;
(S4) a second pulverizing means for pulverizing the granulated soil and finally transferring to an incineration means;
(S5) transferring the soil to be dried into the incineration inner cylinder through the feeding funnel, rotating the incineration inner cylinder, leading out the soil in the incineration inner cylinder after the soil is dried, and discharging tail gas discharged from the drying gas outlet after the tail gas is subjected to the solution containing calcium hydroxide and finally enters activated carbon for adsorption.
The beneficial effects of the invention are as follows: the system for treating the polluted soil based on the leaching method, the leaching agent and the treatment method have the advantages that before the polluted soil is leached, the soil to be treated is made into particles, then the particle-shaped soil is sent into the leaching cloth bag, and the particle-shaped soil is soaked in the leaching box body: firstly, the granular soil is fully soaked, and meanwhile, the soil cannot be loosened, so that more soil cannot be leached into the leaching cloth bag, and the same batch of leaching solution can be used for completing leaching for multiple times; the leaching cloth bag plays a role of a sieve hopper on the soil, so that excessive soil can be prevented from flowing out of the leaching cloth bag; thirdly, the granular soil can reduce the adhesion to the inner wall of the washing cloth bag.
Drawings
FIG. 1 is a schematic structural diagram of the invention;
FIG. 2 is a cross-sectional view of the first/second comminution apparatus according to the invention;
FIG. 3 is a schematic view of the bottom of the first/second shredder of the present invention;
FIG. 4 is a schematic structural diagram of a granulating apparatus according to the present invention;
FIG. 5 is an exploded view of a pelletizing apparatus according to the invention;
FIG. 6 is a cross-sectional view of the leaching apparatus of the present invention;
figure 7 is a cross-sectional view of an incineration device according to the invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
1-7 a system based on drip washing method is disposed and is polluted soil, including first reducing mechanism 1, prilling granulator 2, drip washing device 3, second reducing mechanism 4 and incineration device 5, first reducing mechanism 1, prilling mechanism 2, drip washing device 3, second reducing mechanism 4 and incineration device 5 connect gradually, incineration device 5 is provided with burns chamber 508 and dry chamber 509, it is provided with burns the gas outlet to burn chamber 508, dry chamber 509 sets up dry gas outlet, dry gas outlet is connected with tail gas recovery processing apparatus, calcium hydroxide solution has been placed to tail gas processing apparatus to cover and be equipped with activated carbon on calcium hydroxide solution, the exhaust vapor of soil after the drying contains the pollutant, need can discharge through the absorption rear of calcium hydroxide and activated carbon, in order to avoid causing secondary pollution.
The granulating device 2 comprises a frame 201, a first baffle 202, a second baffle 203, a first push plate 204 and a second push plate 205; the frame body 201 is provided with a feed port 206, an accommodating cavity 207 is arranged below the feed port 206, the accommodating cavity 207 is a through cavity, the first baffle 202 and the second baffle 203 are fixedly embedded at two sides of the accommodating cavity 207, a gap is reserved between the first baffle 202 and the second baffle 203, and the gap is arranged below the feed port 206; and the soil to be treated enters the gap between the first baffle plate and the second baffle plate through the feeding hole to wait for forming.
A plurality of first forming holes 208 are formed in the first baffle plate 202 and the second baffle plate 203, and the first forming holes 208 are through holes; the first push plate 204 is provided with a plurality of first forming columns 209, the second push plate 205 is provided with a plurality of second forming columns 210, the first forming columns 209 are slidably connected to the first forming holes 208 on the first baffle plate 202, and the second forming columns 210 are slidably connected to the first forming holes 208 on the second baffle plate 203.
A material collecting groove 211 is arranged between the second push plate 205 and the second baffle plate 203, the material collecting groove 211 is arranged below the second push plate 205, the length of the first forming column 209 is greater than that of the second forming column 210, and the first forming column 209 can slide into the first forming hole 208 of the second baffle plate 203 from the first forming hole 208 of the first baffle plate 202 and push the second forming column 210 out of the second baffle plate 203;
the both sides of framework 201 are provided with otic placode 212, one of them side swivelling joint has the nut on the otic placode 212, and the cover is equipped with linear bearing on the otic placode 212 of opposite side, be provided with polished rod 213 and lead screw 214 on first push pedal 204 and the second push pedal 205, lead screw 214 is connected with the nut cooperation, polished rod 213 is connected with the linear bearing cooperation.
In the process, the first forming column pushes the soil in the gap between the first baffle and the second baffle into the second baffle, the pressure maintaining is carried out for a period of time, the first push plate and the second push plate move together along the same direction, and because conical counterbores are arranged on the opposite surfaces of the first baffle 202 and the second baffle 203 and are in one-to-one correspondence with the first forming holes 209, and the end parts of the first forming column 209 and the second forming column 210 are provided with the semicircular second forming holes 215, the manufactured soil particles can be guaranteed to be solid and spherical. The first push plate and the second push plate should drive a lead screw by a motor, and the lead screw drives the first push plate and the second push plate to move.
The first crushing device 1/the second crushing device 4 comprises a first crushing box body 101, a second crushing box body 102 and two crushing rollers 103 which rotate relatively, the two crushing rollers 103 which rotate relatively are rotatably connected inside the first crushing box body 101, the second crushing box body 102 is sleeved on the top of the first crushing box body 101 and is arranged above the crushing rollers 103, the bottom of the second crushing box body 102 is provided with a second crushing outlet 104, and the second crushing outlet 104 is arranged above the two crushing rollers 103 which are mutually meshed; the bottom of the crushing box can be rotatably connected with crushing blades to enhance the crushing effect.
A first crushing outlet 105 is formed in the bottom of the first crushing box 101, the first crushing outlet 105 is a plurality of concentric fan-shaped rings, a baffle 106 is rotatably connected to the bottom of the first crushing outlet 105, and the baffle 106 is a plurality of concentric fan-shaped rings; the baffles 106 rotate, and when a plurality of fan-shaped rings of the baffles are overlapped with the fan-shaped ring of the first pulverizing outlet 105, the first pulverizing outlet is closed, and when the fan-shaped ring of the baffles 106 is separated from the fan-shaped ring of the first pulverizing outlet, the first pulverizing outlet is opened.
Crushing roller 103's surface cover is equipped with protective sheath 107, the protective sheath adopts the rubber material, and when meetting harder stone, the protective sheath of rubber material can avoid the stone to destroy the surface of crushing roller.
The leaching device 3 comprises a leaching box body 301, a partition plate 302 is arranged in the leaching box body 301, the inner cavity of the leaching box body 301 is divided into an upper cavity 303 and a lower cavity 304 by the partition plate 302 of the leaching box body 301, a plurality of leaching cloth bags 305 are arranged in the lower cavity 304, two ends of the plurality of leaching cloth bags 305 are respectively and fixedly connected with the partition plate 302 and a bottom plate of the leaching box body 301, the inner cavity of the leaching cloth bag 305 is communicated with the upper cavity 303, the lower cavity 304 is provided with a leaching solution inlet 306 and a leaching solution outlet 307, the leaching solution inlet 306 is arranged at the top of the lower cavity 304, the leaching solution outlet 307 is arranged at the bottom of the lower cavity 304, leaching solution flows in from the leaching solution inlet and flows out from the leaching solution outlet to form circular flow, a baffle plate 308 is slidably connected below the leaching box body 301, when soil in the leaching cloth bags needs to be discharged, the baffle plate 308 is pulled out, soil in the leaching cloth bag falls down, the baffle plate needs to be pressed against the bottom of the leaching cloth bag in the leaching process and is provided with a seal, the bottom of the baffle plate 308 is provided with a collecting groove 309, and the bottom of the collecting groove 309 contracts towards the center.
The leaching cloth bag is woven by nylon ropes, and after the spherical soil is soaked in the leaching cloth bag by the leaching agent, the leaching liquid is fully absorbed and can be prevented from loosening, so that the adhesion between the spherical soil and the leaching cloth bag is reduced, and the granular soil soaked by the leaching liquid can smoothly fall down.
In the course of transfer from the rinsing device to the second comminution apparatus and from the second comminution apparatus to the incineration device, a conveyor belt with draining bores is used.
The incineration device 5 comprises an incineration outer cylinder 501, an incineration inner cylinder 502, a feeding rod 503 and a rack 504, the incineration outer cylinder 501 is fixedly connected with the rack 504, the incineration outer cylinder 501 is coated outside the incineration inner cylinder 502, the feeding rod 503 extends into the incineration inner cylinder 502, the incineration outer cylinder 501 and the feeding rod 503 are respectively and rotatably connected with the incineration inner cylinder 502, namely, the incineration outer cylinder and the feeding rod are kept still, the incineration inner cylinder 502 rotates, the inner wall of the incineration inner cylinder 502 is connected with a plurality of stirring blades 505, the stirring blades 505 are spiral, one end of the incineration inner cylinder 502 is provided with a soil outlet, the incinerated soil is discharged from the soil outlet after being dried, and a hygrometer is required to be arranged in the incineration inner cylinder so as to monitor the humidity of the soil at any time;
and burning the fuel in the burning cavity to heat the burning inner cylinder so as to finish drying the leached soil.
An incineration chamber 508 is formed between the incineration outer cylinder 501 and the incineration inner cylinder 502, the incineration chamber 508 is communicated with an incineration gas outlet, a drying chamber 509 is formed in the inner cavity of the incineration inner cylinder 502, and the drying gas outlet is communicated with the drying chamber 509;
the feeding rod 503 is a right-angled cavity, one end of the feeding rod 503 is provided with a feeding funnel 506, the other end of the feeding rod 503 is provided with a discharge port 507, and the discharge port 507 extends into the drying cavity 509.
A leaching agent, which comprises 2% ammonium nitrate solution with the concentration of 0.1 mol/L; 1% ammonium dihydrogen phosphate with the concentration of 0.15 mol/L; 2.5 percent of ammonium oxalate solution with the concentration of 0.1mol/L, and the balance of water.
A method for treating polluted soil based on a leaching method comprises the following steps:
(S1) introducing the soil to be treated into a first crushing device, crushing the soil to be treated by the crushing roller, accumulating the crushed soil at the bottom of a first crushing box body, and then rotating a baffle plate to introduce the soil therein into a granulating device;
(S2) the crushed soil enters the accommodating cavity from the feeding hole of the granulating device and is placed in a gap between the first baffle plate and the second baffle plate, at the moment, the first forming column is completely retracted into the first forming hole of the first baffle plate, the second forming column is completely retracted into the second forming hole of the second baffle plate, then the first push plate moves, the first forming column pushes the soil between the gaps into the first forming hole of the second push plate until the second forming column is completely pushed out of the second push plate, the bulk polluted soil is made into a spherical shape, the spherical soil is made to fall into the collecting groove, and then the soil is transferred into the leaching device;
(S3) adding the leaching agent according to claim 9 to the leaching device, leaching, then drawing out the striker plate, and allowing the soil in the leaching cloth bag to fall into the feeding box and then transferring to the second crushing device;
(S4) a second pulverizing means for pulverizing the granulated soil and finally transferring to an incineration means;
(S5) transferring the soil to be dried into the incineration inner cylinder through the feeding funnel, rotating the incineration inner cylinder, leading out the soil in the incineration inner cylinder after the soil is dried, and discharging tail gas discharged from the drying gas outlet after the tail gas is subjected to the solution containing calcium hydroxide and finally enters activated carbon for adsorption.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (7)
1. A system for treating contaminated soil based on a leaching method is characterized in that: the tail gas recovery and treatment device comprises a first crushing device (1), a granulating device (2), a leaching device (3), a second crushing device (4) and an incinerating device (5), wherein the first crushing device (1), the granulating device (2), the leaching device (3), the second crushing device (4) and the incinerating device (5) are sequentially connected, the incinerating device (5) is provided with an incinerating cavity (508) and a drying cavity (509), the incinerating cavity (508) is provided with an incinerating gas outlet, the drying cavity (509) is provided with a drying gas outlet, and the drying gas outlet is connected with a tail gas recovery and treatment device;
the granulating device (2) comprises a frame body (201), a first baffle plate (202), a second baffle plate (203), a first push plate (204) and a second push plate (205); the frame body (201) is provided with a feeding hole (206), an accommodating cavity (207) is arranged below the feeding hole (206), the accommodating cavity (207) is a through cavity, the first baffle plate (202) and the second baffle plate (203) are fixedly connected to two sides of the accommodating cavity (207), a gap is reserved between the first baffle plate (202) and the second baffle plate (203), and the gap is arranged below the feeding hole (206);
a plurality of first forming holes (208) are formed in the first baffle plate (202) and the second baffle plate (203), and the first forming holes (208) are through holes; a plurality of first forming columns (209) are arranged on the first push plate (204), a plurality of second forming columns (210) are arranged on the second push plate (205), the first forming columns (209) are connected to first forming holes (208) on the first baffle plate (202) in a sliding mode, and the second forming columns (210) are connected to first forming holes (208) on the second baffle plate (203) in a sliding mode;
a material collecting groove (211) is arranged between the second push plate (205) and the second baffle plate (203), the material collecting groove (211) is arranged below the second push plate (205) and the second baffle plate (203), the length of the first forming column (209) is greater than that of the second forming column (210), and the first forming column (209) can slide into the first forming hole (208) of the second baffle plate (203) from the first forming hole (208) of the first baffle plate (202) and push the second forming column (210) out of the second baffle plate (203);
conical counterbores are arranged on the opposite surfaces of the first baffle plate (202) and the second baffle plate (203), and the counterbores are opposite to the first forming holes (209) one by one;
the ends of the first forming column (209) and the second forming column (210) are provided with semicircular second forming apertures (215).
2. The system for treating contaminated soil based on the leaching method according to claim 1, wherein: the both sides of framework (201) are provided with otic placode (212), one side of which swivelling joint has the nut on otic placode (212), and the cover is equipped with slide bearing on opposite side otic placode (212), be provided with polished rod (213) and lead screw (214) on first push pedal (204) and second push pedal (205), lead screw (214) are connected with the nut cooperation, polished rod (213) are connected with the linear bearing cooperation.
3. The system for treating contaminated soil based on the leaching method according to claim 2, wherein: the first crushing device (1)/the second crushing device (4) comprises a first crushing box body (101), a second crushing box body (102) and two crushing rollers (103) which rotate relatively, the two crushing rollers (103) which rotate relatively are connected inside the first crushing box body (101), the second crushing box body (102) is sleeved on the top of the first crushing box body (101) and is arranged above the crushing rollers (103), a second crushing outlet (104) is arranged at the bottom of the second crushing box body (102), and the second crushing outlet (104) is arranged above the two crushing rollers (103) which are mutually meshed;
a first crushing outlet (105) is formed in the bottom of the first crushing box body (101), the first crushing outlet (105) is a plurality of concentric fan-shaped rings, a baffle (106) is rotatably connected to the bottom of the first crushing outlet (105), and the baffle (106) is a plurality of concentric fan-shaped rings;
the outer surface of the crushing roller (103) is covered with a protective sleeve (107).
4. The system for treating contaminated soil based on the leaching method according to claim 3, wherein: the leaching device (3) comprises a leaching box body (301), a partition plate (302) is arranged in the leaching box body (301), the inner cavity of the leaching box body (301) is divided into an upper cavity (303) and a lower cavity (304) by the partition plate (302) of the leaching box body (301), a plurality of leaching cloth bags (305) are arranged in the lower cavity (304), two ends of the plurality of leaching cloth bags (305) are fixedly connected to the partition plate (302) and a bottom plate of the leaching box body (301) respectively, the inner cavity of the leaching cloth bags (305) is communicated with the upper cavity (303), the lower cavity (304) is provided with a leaching liquid inlet (306) and a leaching liquid outlet (307), the leaching liquid inlet (306) is arranged at the top of the lower cavity (304), the leaching liquid outlet (307) is arranged at the bottom of the lower cavity (304), and a baffle plate (308) is slidably connected below the leaching box body (301), the bottom of the material baffle plate (308) is provided with a collecting groove (309), and the bottom of the collecting groove (309) shrinks towards the center.
5. The system for treating contaminated soil based on the leaching method according to claim 4, wherein: the incineration device (5) comprises an incineration outer cylinder (501), an incineration inner cylinder (502), a feeding rod (503) and a rack (504), the incineration outer cylinder (501) is fixedly connected with the rack (504), the incineration outer cylinder (501) is wrapped outside the incineration inner cylinder (502), the feeding rod (503) extends to the inside of the incineration inner cylinder (502), the incineration outer cylinder (501) and the feeding rod (503) are respectively and rotatably connected with the incineration inner cylinder (502), the inner wall of the incineration inner cylinder (502) is connected with a plurality of stirring blades (505), the stirring blades (505) are spiral, and one end of the incineration inner cylinder (502) is provided with a soil outlet;
burn outer cylinder (501) and burn between inner cylinder (502) and form chamber (508) of burning, chamber (508) of burning communicates with each other with burning the gas outlet, the inner chamber of burning inner cylinder (502) forms dry chamber (509), dry gas outlet communicates with each other with dry chamber (509).
6. The system for treating contaminated soil based on the leaching method according to claim 5, wherein: the feeding rod (503) is a right-angle cavity, a feeding hopper (506) is arranged at one end of the feeding rod (503), a discharging port (507) is arranged at the other end of the feeding rod (503), and the discharging port (507) extends into the drying cavity (509).
7. A method for treating contaminated soil based on a leaching method, which adopts the system for treating contaminated soil based on a leaching method according to claim 6, and is characterized by comprising the following steps:
(S1) introducing the soil to be treated into a first crushing device, crushing the soil to be treated by the crushing roller, accumulating the crushed soil at the bottom of a first crushing box body, and then rotating a baffle plate to introduce the soil therein into a granulating device;
(S2) the crushed soil enters the accommodating cavity from the feeding hole of the granulating device and is placed in a gap between the first baffle plate and the second baffle plate, at the moment, the first forming column is completely retracted into the first forming hole of the first baffle plate, the second forming column is completely retracted into the second forming hole of the second baffle plate, then the first push plate moves, the first forming column pushes the soil between the gaps into the first forming hole of the second push plate until the second forming column is completely pushed out of the second push plate, the bulk polluted soil is made into a spherical shape, the spherical soil is made to fall into the collecting groove, and then the soil is transferred into the leaching device;
(S3) adding a rinsing agent to the rinsing device, the rinsing agent: comprises 2 percent of ammonium nitrate solution with the concentration of 0.1 mol/L; 1% ammonium dihydrogen phosphate with the concentration of 0.15 mol/L; 2.5% ammonium oxalate solution with the concentration of 0.1mol/L and the balance of water;
leaching, then drawing out the baffle plate, enabling the soil in the leaching cloth bag to fall into a feeding box, and then transferring the soil into a second crushing device;
(S4) a second pulverizing means for pulverizing the granulated soil and finally transferring to an incineration means;
(S5) transferring the soil to be dried into the incineration inner cylinder through the feeding funnel, rotating the incineration inner cylinder, leading out the soil in the incineration inner cylinder after the soil is dried, and discharging tail gas discharged from the drying gas outlet after the tail gas is subjected to the solution containing calcium hydroxide and finally enters activated carbon for adsorption.
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| CN109821872B true CN109821872B (en) | 2021-12-28 |
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