CN113909286B - Soil leaching equipment and method for heavy metal contaminated soil remediation - Google Patents

Soil leaching equipment and method for heavy metal contaminated soil remediation Download PDF

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Publication number
CN113909286B
CN113909286B CN202111215328.1A CN202111215328A CN113909286B CN 113909286 B CN113909286 B CN 113909286B CN 202111215328 A CN202111215328 A CN 202111215328A CN 113909286 B CN113909286 B CN 113909286B
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China
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soil
leaching
movable chassis
crushing
communicated
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CN202111215328.1A
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CN113909286A (en
Inventor
李群
范婷婷
王祥
赵远超
张胜田
万金忠
周艳
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Nanjing Institute of Environmental Sciences MEE
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Nanjing Institute of Environmental Sciences MEE
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Publication of CN113909286B publication Critical patent/CN113909286B/en
Priority to JP2022130480A priority patent/JP7177316B1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/286—Feeding or discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/286—Feeding or discharge
    • B02C2013/28618—Feeding means
    • B02C2013/28654—Feeding means of screw type

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention relates to the technical field of heavy metal soil remediation, and discloses soil leaching equipment and a method for heavy metal contaminated soil remediation; the soil leaching equipment comprises a movable chassis, a soil taking unit arranged at the front end of the movable chassis, a leaching unit arranged in the middle of the movable chassis, and a water filtering and soil discharging unit arranged at the rear end of the movable chassis; the method comprises the following steps: the movable chassis enters a heavy metal polluted soil plot, and the soil taking unit is contacted with the soil; then the movable chassis advances to make the polluted soil enter a leaching unit; then leaching the polluted soil, and stirring by using a stirring roller set; the water and soil filtering and discharging unit is used for filtering water of soil and then discharging the soil; the invention can solve the problems of large occupied area and complex ex-situ treatment process of treatment equipment in the prior art and realize in-situ soil leaching treatment.

Description

Soil leaching equipment and method for heavy metal contaminated soil remediation
Technical Field
The invention relates to the technical field of heavy metal soil remediation, in particular to soil leaching equipment and a method for heavy metal contaminated soil remediation.
Background
In recent years, some industrial enterprises occupying superior positions in urban areas among industrial structure adjustment and urban land structure adjustment are out of busy areas through easy land movement, relocation and transformation. Pollutants such as important metals, pesticides, volatile and persistent organic pests and the like left in the place after the enterprise is moved become urban land development and utilization environmental hidden dangers, the urban human settlements environmental safety problem is worried about, and risk assessment and restoration treatment are urgently needed to be developed.
The soil leaching and repairing technology is a process of eluting pollutants in soil by using water or a medium of an eluting agent such as an aqueous solution containing a washing auxiliary agent, an acid/alkali solution, a complexing agent or a surfactant and the like.
In the prior art, the heavy metal contaminated soil is treated by adopting an ex-situ treatment method, the contaminated soil is transported to a repair site by adopting transportation equipment, the contaminated soil is separated by a drum screen, oversize materials are backfilled, and undersize materials are finely separated; treating the undersize through a hydrocyclone separator, and backfilling the obtained sand after the detection of the sand reaches the standard; the prior art has the problems of large occupied area of treatment equipment, complex treatment process and high treatment cost in the process; the method can not be quickly implemented in situ, and the soil is leached.
Disclosure of Invention
The technical problem solved by the invention is as follows: in the prior art, the treatment equipment for leaching the heavy metal contaminated soil occupies a large area, and has complex ex-situ treatment procedures and high treatment cost.
The technical scheme of the invention is as follows: the soil leaching equipment for repairing the heavy metal contaminated soil comprises a movable chassis, an earth taking unit arranged at the front end of the movable chassis, a leaching unit arranged in the middle of the movable chassis and communicated with the earth taking unit, a water and soil filtering and discharging unit arranged at the rear end of the movable chassis and communicated with the leaching unit, and a leacheate supply unit arranged on the movable chassis and communicated with the leaching unit;
the soil taking unit comprises a lifting guide rail vertically arranged at the front end of the movable chassis, a soil crushing assembly movably arranged on the lifting guide rail, a soil inlet piece capable of contacting with soil, and a spiral feeding roller set communicated with the soil inlet piece and the soil crushing assembly;
the leaching unit comprises two leaching cavities which are horizontally arranged, are triangular prism-shaped and are communicated with each other, two groups of stirring roller sets which are respectively horizontally arranged in the leaching cavities, and two groups of leaching liquid outlets which are respectively arranged in the leaching cavities and are communicated with the leaching liquid supply unit;
the lower end face of the first leaching cavity is horizontally arranged, and a feeding hole communicated with the soil crushing assembly is formed in the lower end face; the upper end face of the second leaching cavity is horizontally arranged, and a discharge hole communicated with the water filtering and soil discharging unit is formed in the upper end face;
the stirring roller group comprises three stirring rotating shafts which are arranged in a triangular shape and stirring blades which are uniformly arranged on the stirring rotating shafts;
the leacheate outlets respectively comprise three leacheate spray heads which are respectively arranged corresponding to the stirring rotating shafts;
the water and soil filtering and discharging unit comprises a spiral water filtering component and a centrifugal water discharging component, wherein the spiral water filtering component is obliquely arranged above the discharge hole;
the spiral water filtering component comprises a plurality of cylinders which are obliquely arranged side by side, spiral rotating blades which are movably arranged in the cylinders, drain holes which are uniformly arranged on the spiral rotating blades, and drain grooves which are uniformly arranged on the inner side walls of the cylinders;
the outer diameter of the spiral rotating blade fan is the same as the inner diameter of the cylinder;
the centrifugal drainage assembly comprises a centrifugal round cavity with a cylindrical shape, a centrifugal rotating shaft arranged at the center of the inner part of the centrifugal round cavity, a centrifugal water filtering screen plate uniformly arranged on the centrifugal rotating shaft, a filtering drainage screen plate arranged on the side surface of the centrifugal round cavity and a soil outlet arranged on the side surface of the centrifugal round cavity.
Furthermore, the soil crushing assembly comprises a circular crushing cavity, connecting sliding blocks arranged at two ends of the circular crushing cavity and connected with the lifting guide rail, a crushing rotating shaft arranged inside the circular crushing cavity and uniformly arranged on soil crushing pieces on the crushing rotating shaft. The height of the soil crushing assembly can be adjusted by the aid of the connecting sliding blocks, so that the depth of the lower end of the feed roller set entering soil is changed, soil taking at different depths can be realized, and leaching treatment is carried out.
Furthermore, a metal interception net is arranged on the side surface of the circular crushing cavity; and a discharge protection cover communicated with the feed inlet is arranged outside the metal interception net. The soil blocks with larger grain sizes can be intercepted through the arrangement of the metal intercepting nets, so that the soil with small grain sizes can pass through the crushing assembly after the crushing assembly fully crushes the soil blocks; therefore, the crushing quality of the crushing assembly can be effectively improved.
Furthermore, the feeding roller group comprises feeding pipes which are arranged side by side and the upper ends of which are connected with the soil crushing assembly, a spiral feeding roller arranged in the feeding pipes, an arc-shaped chute which is arranged at the upper end of the feeding pipes and is movably connected with the feeding pipes, and a power assembly which is arranged on the soil crushing assembly and drives the arc-shaped chute to rotate;
the spiral feed roller can make soil pass through the conveying pipe and get into inside the broken subassembly of soil. The power assembly drives the arc-shaped chute to rotate, so that the included angle between the spiral feeding roller and the ground can be adjusted, and the depth of the lower end entering the soil is controlled; in addition, the soil feeding amount can be adjusted.
Further, the soil feeding piece comprises a material collecting opening connected with the lower end of the feeding roller group and a stone blocking net arranged on the material collecting opening. Larger stones in soil can be blocked outside through the arrangement of the stone blocking net, and the larger stones are prevented from entering the feeding roller set to cause the blockage of the spiral feeding roller; the mechanical failure rate can be reduced.
Further, the movable chassis comprises a bearing frame and wheels or crawler belts arranged on the bearing frame; the passing performance of the moving process of the device can be greatly enhanced through the arrangement of the wheels or the crawler, the device can be suitable for the soil environment with complex ground, and the practicability is high.
Further, the leacheate supply unit comprises a liquid storage cavity for containing leacheate and an adjustable negative pressure assembly communicated with the leacheate outlet and the liquid storage cavity. The adjustable negative pressure component can adjust the introducing pressure of the leacheate and the mixing amount of the leacheate and the soil, and is beneficial to high-quality soil leaching treatment.
Further, the leacheate is any one of citric acid with the mass fraction concentration of 3-8%, glutamic acid with the mass fraction concentration of 6-9%, diacetic acid with the mass fraction concentration of 2-5% and ethylenediamine tetraacetic acid with the mass fraction concentration of 3-5%; the leacheate can be used for efficiently eluting heavy metals in the polluted soil, so that the heavy metals in the soil can be effectively removed, and the content of the heavy metals in the soil is reduced.
Furthermore, a backflow water collecting tank communicated with the leaching cavity is further arranged below the filtering and draining screen plate arranged on the side face of the centrifugal circular cavity, and recovered liquid in the backflow water collecting tank is introduced into the leaching cavity through a negative pressure pump. The utilization efficiency of the leacheate can be improved through the backflow water collecting tank and the negative pressure pump, and the use amount of the leacheate is saved.
The soil leaching method for restoring the heavy metal contaminated soil by using the soil leaching equipment comprises the following steps:
s1: soil collection
The movable chassis enters a heavy metal polluted soil plot, and the soil inlet piece of the soil taking unit is contacted with soil; then the movable chassis moves forward to enable the polluted soil to enter the soil crushing assembly through the spiral feeding roller set;
s2: soil crushing
Crushing the entering soil by the soil crushing member in the soil crushing assembly at a rotating speed of 150-300 r/min;
s3: soil leaching
The crushed soil enters a leaching cavity, a leaching solution supply unit leaches the polluted soil through a leaching solution outlet, and the stirring roller set stirs the polluted soil at the same time, wherein the stirring speed is 200-400 r/min; wherein the mixing ratio of the soil to the leacheate is 2-5: 1;
s4: soil drainage treatment
The spiral water filtering component and the centrifugal water draining component sequentially filter water of the soil and then discharge the soil.
The invention has the beneficial effects that: compared with the ex-situ leaching treatment in the prior art, the treatment cost can be greatly reduced, the problems of difficult transportation and large occupied area of ex-situ soil are solved, the treatment process can be effectively reduced, and the treatment efficiency is improved; the device can carry out in-situ leaching treatment on heavy metal contaminated soil by arranging the soil taking unit, the leaching unit and the water filtering and soil discharging unit on the movable chassis; the device can carry out full and efficient leaching treatment on the soil by arranging the stirring roller sets in the two triangular leaching cavities; the inclined spiral water filtering component can enable the redundant leacheate to flow back to the leaching cavity in the process of discharging the leached soil; the water content in the soil can be reduced for the second time through the centrifugal drainage assembly, so that the utilization rate of the leacheate is improved, the consumption of the leacheate is reduced, and the treatment cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the whole of embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a soil sampling unit in embodiment 1 of the invention;
FIG. 3 is a schematic structural diagram of a leaching unit in example 1 of the present invention;
FIG. 4 is a schematic structural view of a water filtration and soil removal unit according to example 1 of the present invention;
FIG. 5 is a schematic view showing the construction of a soil breaking assembly according to embodiment 2 of the present invention;
FIG. 6 is a schematic structural view of a spiral feed roller group in embodiment 2 of the present invention;
wherein, 1-a movable chassis, 10-a bearing frame, 2-a soil taking unit, 20-a lifting guide rail, 21-a soil crushing component, 210-a circular crushing cavity, 211-a connecting slide block, 212-a crushing rotating shaft, 213-a soil crushing component, 214-a metal interception net, 215-a discharge protection cover, 22-a soil inlet component, 220-a material collecting port, 221-a stone blocking net, 23-a spiral feeding roller set, 230-a feeding pipe, 231-a spiral feeding roller, 232-an arc chute, 233-a power component, 3-a leaching unit, 30-a leaching cavity, 300-a feeding port, 31-a stirring roller set, 310-a stirring rotating shaft, 311-a stirring blade, 32-a leaching solution outlet, 320-a leaching spray head, 4-a leaching solution supply unit, 40-liquid storage cavity, 5-water and soil discharging unit, 50-spiral water filtering component, 51-centrifugal water discharging component, 500-cylinder, 501-spiral rotating blade, 502-water discharging tank, 510-centrifugal circular cavity, 511-centrifugal rotating shaft, 512-centrifugal water filtering screen plate, 513-filtering water discharging screen plate and 514-soil outlet.
Detailed Description
Example 1:
as shown in fig. 1, the soil leaching equipment for heavy metal contaminated soil remediation comprises a movable chassis 1, an earth taking unit 2 arranged at the front end of the movable chassis 1, a leaching unit 3 arranged in the middle of the movable chassis 1 and communicated with the earth taking unit 2, a water and soil filtering and discharging unit 5 arranged at the rear end of the movable chassis 1 and communicated with the leaching unit 3, and a leaching solution supply unit 4 arranged on the movable chassis 1 and communicated with the leaching unit 3;
as shown in fig. 2, the soil taking unit 2 comprises a lifting guide rail 20 vertically arranged at the front end of the movable chassis 1, a soil crushing assembly 21 movably arranged on the lifting guide rail 20, a soil feeding member 22 capable of contacting with soil, and a spiral feeding roller group 23 communicated with the soil feeding member 22 and the soil crushing assembly 21;
as shown in fig. 3, the leaching unit 3 includes two leaching chambers 30 horizontally arranged and having a triangular prism shape and communicated with each other, two sets of agitating roller sets 31 horizontally arranged in the leaching chambers 30, respectively, and two sets of leaching solution outlets 32 arranged in the leaching chambers 30 and communicated with the leaching solution supply unit 4, respectively;
as shown in fig. 3, the lower end surface of the first leaching chamber 30 is horizontally arranged, and a feeding hole 300 communicated with the soil crushing assembly 21 is formed in the lower end surface; the upper end surface of the second leaching cavity 30 is horizontally arranged, and a discharge hole communicated with the water filtering and soil discharging unit 5 is formed in the upper end surface;
the stirring roller group 31 comprises three stirring rotating shafts 310 which are arranged in a triangular shape, and stirring blades 311 which are uniformly arranged on the stirring rotating shafts 310;
the leacheate outlets 32 respectively comprise three leaching nozzles 320 which are respectively arranged corresponding to the stirring rotating shaft 310;
as shown in fig. 3, the water and soil filtering and discharging unit 5 comprises a spiral water filtering component 50 obliquely arranged above the discharge port, and a centrifugal water discharging component 51 communicated with the spiral water filtering component 50;
as shown in fig. 4, the spiral water filtering assembly 50 includes 5 cylinders 500 disposed side by side in an inclined manner, spiral rotating blades 501 movably disposed in the cylinders 500, drain holes uniformly disposed on the spiral rotating blades 501, and drain grooves 502 uniformly disposed on the inner side walls of the cylinders 500;
the outer diameter of the spiral rotating blade fan 501 is the same as the inner diameter of the cylinder 500;
the centrifugal drainage assembly 51 comprises a centrifugal circular chamber 510 with a cylindrical shape, a centrifugal rotating shaft 511 arranged at the center of the inside of the centrifugal circular chamber 510, a centrifugal water filtering screen plate 512 uniformly arranged on the centrifugal rotating shaft 511, a filtering drainage screen plate 513 arranged on the side surface of the centrifugal circular chamber 510, and a soil outlet 514 arranged on the side surface of the centrifugal circular chamber 510.
The movable chassis 1 includes a load-carrying frame 10, and wheels provided on the load-carrying frame 10.
The leacheate supply unit 4 comprises a liquid storage cavity 40 for containing leacheate and an adjustable negative pressure component for communicating the leacheate outlet 32 with the liquid storage cavity 40.
The leacheate is ethylenediamine tetraacetic acid with the mass fraction concentration of 3%.
The soil crushing assembly 21, the spiral feeding roller set 23, the centrifugal rotating shaft 511, the spiral rotating fan 501, the stirring rotating shaft 310 and the adjustable negative pressure assembly are all products in the prior art, and specific product types can be selected by a person skilled in the art according to needs.
The soil leaching method for restoring the heavy metal contaminated soil by using the soil leaching equipment comprises the following steps:
s1: soil collection
The movable chassis 1 enters a heavy metal polluted soil plot, and the soil inlet piece 22 of the soil taking unit 2 is contacted with soil; then the movable chassis 1 advances to make the polluted soil enter the soil crushing assembly 21 through the spiral feeding roller group 23;
s2: soil crushing
The soil crushing member 213 crushes the incoming soil at a rotation speed of 150r/min inside the soil crushing assembly 21;
s3: soil leaching
The crushed soil enters the leaching cavity 30, the leaching solution supply unit 4 leaches the polluted soil through the leaching solution outlet 32, and the stirring roller set 31 stirs the polluted soil at the same time, wherein the stirring speed is 200 r/min; wherein the mixing ratio of the soil to the leacheate is 2: 1;
s4: soil drainage treatment
The spiral water filtering component 50 and the centrifugal water draining component 51 sequentially filter water of the soil and then discharge the soil.
Example 2:
a soil leaching device for repairing heavy metal contaminated soil comprises a movable chassis 1, an earth taking unit 2 arranged at the front end of the movable chassis 1, a leaching unit 3 arranged in the middle of the movable chassis 1 and communicated with the earth taking unit 2, a water and soil filtering and discharging unit 5 arranged at the rear end of the movable chassis 1 and communicated with the leaching unit 3, and a leacheate supply unit 4 arranged on the movable chassis 1 and communicated with the leaching unit 3;
the soil taking unit 2 comprises a lifting guide rail 20 vertically arranged at the front end of the movable chassis 1, a soil crushing assembly 21 movably arranged on the lifting guide rail 20, a soil feeding member 22 capable of contacting with soil, and a spiral feeding roller group 23 communicated with the soil feeding member 22 and the soil crushing assembly 21;
the leaching unit 3 comprises two leaching cavities 30 which are horizontally arranged, are triangular prism-shaped and are communicated with each other, two groups of stirring roller sets 31 which are respectively horizontally arranged in the leaching cavities 30, and two groups of leaching liquid outlets 32 which are respectively arranged in the leaching cavities 30 and are communicated with the leaching liquid supply unit 4;
the lower end face of the first leaching cavity 30 is horizontally arranged, and a feeding hole 300 communicated with the soil crushing assembly 21 is formed in the lower end face; the upper end surface of the second leaching cavity 30 is horizontally arranged, and a discharge hole communicated with the water filtering and soil discharging unit 5 is formed in the upper end surface;
the stirring roller group 31 comprises three stirring rotating shafts 310 which are arranged in a triangular shape, and stirring blades 311 which are uniformly arranged on the stirring rotating shafts 310;
the leacheate outlets 32 respectively comprise three leaching nozzles 320 which are respectively arranged corresponding to the stirring rotating shaft 310;
the water and soil filtering and discharging unit 5 comprises a spiral water filtering component 50 obliquely arranged above the discharge port and a centrifugal water discharging component 51 communicated with the spiral water filtering component 50;
the spiral water filtering component 50 comprises 4 cylinders 500 which are obliquely arranged side by side, spiral rotating blades 501 which are movably arranged in the cylinders 500, drain holes which are uniformly arranged on the spiral rotating blades 501, and drain grooves 502 which are uniformly arranged on the inner side walls of the cylinders 500;
the outer diameter of the spiral rotating blade fan 501 is the same as the inner diameter of the cylinder 500;
the centrifugal drainage assembly 51 comprises a centrifugal circular chamber 510 with a cylindrical shape, a centrifugal rotating shaft 511 arranged at the center of the inside of the centrifugal circular chamber 510, a centrifugal water filtering screen plate 512 uniformly arranged on the centrifugal rotating shaft 511, a filtering drainage screen plate 513 arranged on the side surface of the centrifugal circular chamber 510, and a soil outlet 514 arranged on the side surface of the centrifugal circular chamber 510.
The movable chassis 1 comprises a load-bearing frame 10, and wheels or tracks arranged on the load-bearing frame 10.
The leacheate supply unit 4 comprises a liquid storage cavity 40 for containing leacheate and an adjustable negative pressure component for communicating the leacheate outlet 32 with the liquid storage cavity 40.
The leacheate is citric acid with the mass fraction concentration of 5 percent.
As shown in fig. 5, the soil crushing assembly 21 includes a circular crushing cavity 210, connecting sliders 211 disposed at both ends of the circular crushing cavity 210 and connected to the lifting guide rails 20, a crushing rotating shaft 212 disposed inside the circular crushing cavity 210, and soil crushing members 213 uniformly disposed on the crushing rotating shaft 212.
The side surface of the circular crushing cavity 210 is provided with a metal interception net 214; the metal interception net 214 is externally provided with a discharge protective cover 215 communicated with the feed inlet 300.
As shown in fig. 6, the feeding roller set 23 includes feeding pipes 230 arranged side by side and having upper ends connected to the soil crushing assembly 21, spiral feeding rollers 231 arranged in the feeding pipes 230, arc chutes 232 arranged at the upper ends of the feeding pipes 230 and movably connected to the feeding pipes 230, and power assemblies 233 arranged on the soil crushing assembly 21 to drive the arc chutes 232 to rotate;
auger feed rollers 231 enable soil to enter the interior of soil breaking assembly 21 through feed tube 230.
The soil feeding member 22 includes a material collecting port 220 connected to the lower end of the feed roller group 23, and a stone block net 221 provided on the material collecting port 220.
The centrifugal rotating shaft 511, the spiral rotating blade fan 501, the stirring rotating shaft 310 and the adjustable negative pressure component are all products in the prior art, and specific product types can be selected by those skilled in the art according to needs.
The soil leaching method for restoring the heavy metal contaminated soil by using the soil leaching equipment comprises the following steps:
s1: soil collection
The movable chassis 1 enters a heavy metal polluted soil plot, and the soil inlet piece 22 of the soil taking unit 2 is contacted with soil; then the movable chassis 1 advances to make the polluted soil enter the soil crushing assembly 21 through the spiral feeding roller group 23;
s2: soil crushing
The soil crushing member 213 crushes the incoming soil at a rotation speed of 300r/min inside the soil crushing assembly 21;
s3: soil leaching
The crushed soil enters the leaching cavity 30, the leaching solution supply unit 4 leaches the polluted soil through the leaching solution outlet 32, and the stirring roller set 31 stirs the polluted soil at the stirring speed of 400 r/min; wherein the mixing ratio of the soil to the leacheate is 5: 1;
s4: soil drainage treatment
The spiral water filtering component 50 and the centrifugal water draining component 51 sequentially filter water of the soil and then discharge the soil.
Compared with the embodiment 1, the soil crushing assembly 21 adopted in the embodiment is provided with the metal interception net 214, and the metal interception net can intercept soil with larger particle size, so that the soil can be sufficiently crushed; in addition, the spiral feeding roller 231 can be adjusted and rotated through the arc-shaped sliding groove 232, the angle between the soil feeding piece 22 and the ground is adjusted, and the soil feeding amount can be adjusted.
Example 3:
a soil leaching device for repairing heavy metal contaminated soil comprises a movable chassis 1, an earth taking unit 2 arranged at the front end of the movable chassis 1, a leaching unit 3 arranged in the middle of the movable chassis 1 and communicated with the earth taking unit 2, a water and soil filtering and discharging unit 5 arranged at the rear end of the movable chassis 1 and communicated with the leaching unit 3, and a leacheate supply unit 4 arranged on the movable chassis 1 and communicated with the leaching unit 3;
the soil taking unit 2 comprises a lifting guide rail 20 vertically arranged at the front end of the movable chassis 1, a soil crushing assembly 21 movably arranged on the lifting guide rail 20, a soil feeding member 22 capable of contacting with soil, and a spiral feeding roller group 23 communicated with the soil feeding member 22 and the soil crushing assembly 21;
the leaching unit 3 comprises two leaching cavities 30 which are horizontally arranged, are triangular prism-shaped and are communicated with each other, two groups of stirring roller sets 31 which are respectively horizontally arranged in the leaching cavities 30, and two groups of leaching liquid outlets 32 which are respectively arranged in the leaching cavities 30 and are communicated with the leaching liquid supply unit 4;
the lower end face of the first leaching cavity 30 is horizontally arranged, and a feeding hole 300 communicated with the soil crushing assembly 21 is formed in the lower end face; the upper end surface of the second leaching cavity 30 is horizontally arranged, and a discharge hole communicated with the water filtering and soil discharging unit 5 is formed in the upper end surface;
the stirring roller group 31 comprises three stirring rotating shafts 310 which are arranged in a triangular shape, and stirring blades 311 which are uniformly arranged on the stirring rotating shafts 310;
the leacheate outlets 32 respectively comprise three leaching nozzles 320 which are respectively arranged corresponding to the stirring rotating shaft 310;
the water and soil filtering and discharging unit 5 comprises a spiral water filtering component 50 obliquely arranged above the discharge port and a centrifugal water discharging component 51 communicated with the spiral water filtering component 50;
the spiral water filtering component 50 comprises 6 cylinders 500 which are obliquely arranged side by side, spiral rotating blades 501 which are movably arranged in the cylinders 500, drain holes which are uniformly arranged on the spiral rotating blades 501, and drain grooves 502 which are uniformly arranged on the inner side walls of the cylinders 500;
the outer diameter of the spiral rotating blade fan 501 is the same as the inner diameter of the cylinder 500;
the centrifugal drainage assembly 51 comprises a centrifugal circular chamber 510 with a cylindrical shape, a centrifugal rotating shaft 511 arranged at the center of the inside of the centrifugal circular chamber 510, a centrifugal water filtering screen plate 512 uniformly arranged on the centrifugal rotating shaft 511, a filtering drainage screen plate 513 arranged on the side surface of the centrifugal circular chamber 510, and a soil outlet 514 arranged on the side surface of the centrifugal circular chamber 510.
The movable chassis 1 comprises a load-bearing frame 10, and wheels or tracks arranged on the load-bearing frame 10.
The leacheate supply unit 4 comprises a liquid storage cavity 40 for containing leacheate and an adjustable negative pressure component for communicating the leacheate outlet 32 with the liquid storage cavity 40.
The leacheate is ethylenediamine tetraacetic acid with the mass fraction concentration of 5%.
A backflow water collecting tank communicated with the leaching chamber 30 is further arranged below the filtering and draining screen plate 513 arranged on the side surface of the centrifugal circular chamber 510, and the recovered liquid in the backflow water collecting tank is introduced into the leaching chamber 30 through a negative pressure pump.
The soil crushing assembly 21, the spiral feeding roller set 23, the centrifugal rotating shaft 511, the spiral rotating fan 501, the stirring rotating shaft 310 and the adjustable negative pressure assembly are all products in the prior art, and specific product types can be selected by a person skilled in the art according to needs.
Compared with the embodiment 1, the device has the advantages that the backflow water collecting tank is arranged below the filtering and drainage screen plate 513, so that the utilization efficiency of the leacheate can be improved, and the use amount of the leacheate can be saved.

Claims (9)

1. The soil leaching equipment for repairing the heavy metal contaminated soil is characterized by comprising a movable chassis (1), a soil taking unit (2) arranged at the front end of the movable chassis (1), a leaching unit (3) arranged in the middle of the movable chassis (1) and communicated with the soil taking unit (2), a water and soil filtering and discharging unit (5) arranged at the rear end of the movable chassis (1) and communicated with the leaching unit (3), and a leaching solution supply unit (4) arranged on the movable chassis (1) and communicated with the leaching unit (3);
the soil taking unit (2) comprises a lifting guide rail (20) vertically arranged at the front end of the movable chassis (1), a soil crushing assembly (21) movably arranged on the lifting guide rail (20), a soil feeding piece (22) capable of contacting with soil, and a spiral feeding roller set (23) communicated with the soil feeding piece (22) and the soil crushing assembly (21);
the leaching unit (3) comprises two leaching cavities (30) which are horizontally arranged, are triangular prism-shaped in appearance and are communicated with each other, two groups of stirring roller sets (31) which are respectively and horizontally arranged in the leaching cavities (30), and two groups of leaching liquid outlets (32) which are respectively arranged in the leaching cavities (30) and are communicated with the leaching liquid supply unit (4);
the lower end face of the first leaching cavity (30) is horizontally arranged, and a feeding hole (300) communicated with the soil crushing assembly (21) is formed in the lower end face; the upper end surface of the second leaching cavity (30) is horizontally arranged, and a discharge hole communicated with the water filtering and soil discharging unit (5) is formed in the upper end surface;
the stirring roller group (31) comprises three stirring rotating shafts (310) which are arranged in a triangular shape, and stirring blades (311) which are uniformly arranged on the stirring rotating shafts (310);
the leacheate outlets (32) respectively comprise three leacheate spray heads (320) which are respectively arranged corresponding to the stirring rotating shafts (310);
the water and soil filtering and discharging unit (5) comprises a spiral water filtering component (50) obliquely arranged above the discharge hole and a centrifugal water discharging component (51) communicated with the spiral water filtering component (50);
the spiral water filtering component (50) comprises a plurality of cylinders (500) which are obliquely arranged side by side, spiral rotating blades (501) which are movably arranged in the cylinders (500), drain holes which are uniformly arranged on the spiral rotating blades (501), and drain grooves (502) which are uniformly arranged on the inner side walls of the cylinders (500);
the outer diameter of the spiral rotating blade fan (501) is the same as the inner diameter of the cylinder (500);
centrifugal drainage subassembly (51) are in including the appearance for cylindric centrifugal round chamber (510), set up centrifugal pivot (511) at centrifugal round chamber (510) inside center evenly sets up centrifugal drainage otter board (512) on centrifugal pivot (511), set up and be in filtration drainage otter board (513) of centrifugal round chamber (510) side, and set up and be in unearthed mouthful (514) of centrifugal round chamber (510) side.
2. The soil washing device for heavy metal contaminated soil remediation according to claim 1, wherein the soil crushing assembly (21) comprises a circular crushing cavity (210), connecting sliders (211) arranged at two ends of the circular crushing cavity (210) and connected with the lifting guide rails (20), a crushing rotating shaft (212) arranged inside the circular crushing cavity (210), and soil crushing members (213) uniformly arranged on the crushing rotating shaft (212).
3. The soil washing apparatus for heavy metal contaminated soil remediation according to claim 2, wherein a metal interception net (214) is arranged on the side of the circular crushing chamber (210); and a discharge protective cover (215) communicated with the feed inlet (300) is arranged outside the metal interception net (214).
4. The soil washing equipment for repairing the heavy metal contaminated soil according to claim 1, wherein the feeding roller group (23) comprises feeding pipes (230) which are arranged side by side and the upper ends of which are connected with the soil crushing assembly (21), spiral feeding rollers (231) which are arranged in the feeding pipes (230), an arc-shaped chute (232) which is arranged at the upper ends of the feeding pipes (230) and is movably connected with the feeding pipes (230), and a power assembly (233) which is arranged on the soil crushing assembly (21) and drives the arc-shaped chute (232) to rotate;
the spiral feeding roller (231) enables soil to enter the soil crushing assembly (21) through the feeding pipe (230).
5. The soil washing apparatus for remediation of soil contaminated with heavy metals according to claim 1, wherein the soil inlet member (22) comprises a material collecting port (220) connected to a lower end of the material feeding roller group (23), and a stone blocking net (221) provided on the material collecting port (220).
6. The soil washing apparatus for remediation of heavy metal contaminated soil according to claim 1, wherein the movable chassis (1) comprises a load-bearing frame (10), and wheels or tracks provided on the load-bearing frame (10).
7. The soil washing equipment for heavy metal contaminated soil remediation according to claim 1, wherein the leachate supply unit (4) comprises a liquid storage chamber (40) for containing a leachate, and an adjustable negative pressure assembly communicating the leachate outlet (32) and the liquid storage chamber (40).
8. The soil leaching equipment for repairing heavy metal contaminated soil according to claim 1, wherein the leaching solution is any one of citric acid with a mass fraction concentration of 3-8%, glutamic acid with a mass fraction concentration of 6-9%, diacetic acid with a mass fraction concentration of 2-5%, and ethylenediaminetetraacetic acid with a mass fraction concentration of 3-5%.
9. The soil washing method for restoring the heavy metal contaminated soil by using the soil washing equipment as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:
s1: soil collection
The movable chassis (1) enters a heavy metal contaminated soil plot, and the soil inlet piece (22) of the soil taking unit (2) is contacted with the soil; then the movable chassis (1) advances to enable the polluted soil to enter the soil crushing assembly (21) through the spiral feeding roller set (23);
s2: soil crushing
The soil crushing piece (213) inside the soil crushing assembly (21) crushes the entering soil at the rotating speed of 150-300 r/min;
s3: soil leaching
The crushed soil enters a leaching cavity (30), a leaching solution supply unit (4) leaches the polluted soil through a leaching solution outlet (32), and a stirring roller set (31) stirs the polluted soil at the same time, wherein the stirring speed is 200-400 r/min; wherein the mixing ratio of the soil to the leacheate is 2-5: 1;
s4: soil drainage treatment
The spiral water filtering component (50) and the centrifugal water draining component (51) sequentially perform water filtering treatment on the soil, and then the soil is discharged.
CN202111215328.1A 2021-10-19 2021-10-19 Soil leaching equipment and method for heavy metal contaminated soil remediation Active CN113909286B (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115301723B (en) * 2022-07-08 2023-06-16 生态环境部南京环境科学研究所 Device for restoring contaminated site soil and managing and controlling risks
CN116466063B (en) * 2023-04-17 2023-12-08 广东增源检测技术有限公司 Soil detector based on heavy metal pollution
CN116140349B (en) * 2023-04-24 2024-02-06 陕西文锦实业有限公司 Heavy metal soil restoration method
CN116550744B (en) * 2023-06-28 2023-10-24 山东省土壤污染防治中心 Efficient repairing equipment for soil pollution treatment
CN117705532B (en) * 2023-12-22 2024-05-17 湖北省生态环境厅黄石生态环境监测中心 Pollutant separation device for soil ecological environment detection

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756769B1 (en) * 1996-12-11 1999-02-05 Eds Equipements De Depollution MOBILE MACHINE FOR TREATING NATURAL LANDS IN SOILS TO BE ABLE TO REUSE IN EMBANKMENTS AND TO DEPOLLUTE POLLUTED SOILS
JP2004255223A (en) * 2003-02-24 2004-09-16 Takeshi Kamisa Vehicle for performing purifying treatment of multiply contaminated soil
JP4654134B2 (en) * 2006-02-10 2011-03-16 本多電子株式会社 Purification system for soil contaminated with volatile organic compounds and purification method thereof
JP2010270501A (en) * 2009-05-21 2010-12-02 Kayaba Ind Co Ltd Soil treatment structure
CN103962370B (en) * 2014-05-12 2015-12-02 福建工程学院 The soil remediation method that a kind of absorption and Magneto separate combine
CN203886927U (en) * 2014-05-12 2014-10-22 福建工程学院 Restoration equipment suitable for polluted sandy soil
CN207159074U (en) * 2017-07-05 2018-03-30 浦江县宏创科技开发有限公司 The agricultural integrated vehicle that a kind of mud recycling and fertilising utilize
CN107321777A (en) * 2017-08-10 2017-11-07 苏州三体智能科技有限公司 A kind of soil is crushed and rotary slurries repair system and method
CN108284123B (en) * 2018-01-25 2019-05-03 山东艺林市政园林建设集团有限公司 A kind of multi-functional soil remediation prosthetic appliance
CN209255471U (en) * 2018-10-25 2019-08-16 环境保护部南京环境科学研究所 A kind of portable soil is automatically repaired vehicle
CN209753648U (en) * 2019-03-22 2019-12-10 苏州市宏宇环境科技股份有限公司 Integrated form soil heavy metal drip washing system
CN212051085U (en) * 2020-04-13 2020-12-01 坤德盛科(北京)科技有限公司 Municipal administration mud integration treatment facility
CN111515233A (en) * 2020-04-30 2020-08-11 高淑兰 Soil pollution remediation equipment and method
CN112108508A (en) * 2020-10-16 2020-12-22 丁莹 Vehicle-mounted skid-mounted soil leaching system
CN112221687A (en) * 2020-10-28 2021-01-15 上海同臣环保有限公司 Stirring and crushing sludge strip extruding machine
CN112588805B (en) * 2020-12-24 2022-01-11 生态环境部南京环境科学研究所 Extraction device and extraction method for heavy metal cadmium in rice and wheat planting soil

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