CN210138932U

CN210138932U - Heavy metal contaminated soil repair system

Info

Publication number: CN210138932U
Application number: CN201921018895.6U
Authority: CN
Inventors: 罗正明; 周妍英
Original assignee: Xinzhou Teachers University
Current assignee: Xinzhou Teachers University
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-03-13
Anticipated expiration: 2029-07-02

Abstract

The utility model discloses a heavy metal contaminated soil remediation system, including spraying mechanism, the soil and stone screening mechanism is installed below the spraying mechanism, the conical feed hopper is installed below the soil and stone screening mechanism, the mud-water separation mechanism is installed below the conical feed hopper, the mud-water separation mechanism is communicated with the concrete thickener; the spraying mechanism comprises a water tank, the water tank is communicated with a water inlet pipe, and a first water pump and a plurality of spraying heads are mounted on the water inlet pipe; the water tank is also communicated with a tap water pipe; the concrete thickener is communicated with the water tank through a return pipe; the return pipe is provided with a return pump. The utility model discloses utilize the adsorption efficiency of concrete, adsorb and use the water that contains the heavy metal that soil improvement in-process produced, do not use flocculating agent or other chemicals basically to when accomplishing the heavy metal fixed, saved the water source, and the emission that sewage can not appear basically has reduced the treatment cost of heavy metal soil.

Description

Heavy metal contaminated soil repair system

Technical Field

The utility model belongs to the soil remediation field especially relates to a heavy metal contaminated soil repair system.

Background

The soil heavy metal pollution refers to the condition that the content of trace metal elements in the soil exceeds a background value and is excessively high due to excessive deposition because of human activities, and is generally called soil heavy metal pollution.

At present, the heavy metal treatment method mainly comprises a biological enrichment method, a soil replacement method, a spraying purification method and the like. The biological enrichment method is characterized in that heavy metals are adsorbed by plants adsorbing the heavy metals, and the obtained plants are subjected to special treatment after being felled to prevent the dissipation of the heavy metals, so that the biological enrichment method is slow in effectiveness, overlong in purification period and high in cost, and currently stays in a conceptual stage. The soil replacement method is to dig out the soil with heavy metals for landfill and then supplement the soil without heavy metal pollution, which cannot truly remove the heavy metals, thus having potential danger. Therefore, a spraying purification method is commonly used at present, specifically, after the heavy metal-contaminated soil is soaked in water to dissolve the heavy metal in the water, the water is pumped out to carry out chemical precipitation and the like to solidify and precipitate the heavy metal. A soil remediation system as disclosed in patent 201821143310.9, comprising a crushing and sorting system, a purification system, a sedimentation system, a dewatering system; firstly, polluted soil is crushed and screened, then the soil is put into a spray tower to be sprayed, the PH value in the soil is effectively adjusted, organic pollutants and nitrates in the soil are effectively decomposed through the treatment of an oxygen-free tank and an aeration tank, heavy metals in the soil are effectively removed through the treatment of a chelating tank and a flocculation sedimentation tank, the soil is finally repaired through further filtration by an inclined plate clarifier and dehydration by a vacuum filter, the polluted soil is repaired in multiple directions, the repaired soil can be directly used in the landfill and the original place, and the polluted soil environment is greatly improved. However, the heavy metal precipitation and solidification are all performed by the adsorption and precipitation of the flocculant, but the most important cost in the heavy metal treatment is the cost of the flocculant, and the addition of the flocculant increases the concentration of inorganic salts in water. The research shows that the concrete has good adsorption effect on heavy metals, and the concrete is shown in the article: xie Tian, Deng Guannan, etc., and the exposure research of concrete in heavy metal environment [ J ] nonferrous metallurgy design and research. 2014.6. In the process of manufacturing concrete, water is added to mix materials, then the materials are concentrated in a thickener, and the thickener discharges water, wherein a large amount of water resources are also needed.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a heavy metal contaminated soil repair system. The utility model discloses utilize the adsorption efficiency of concrete, adsorb and use the water that contains the heavy metal that soil improvement in-process produced, do not use flocculating agent or other chemicals basically to when accomplishing the heavy metal fixed, saved the water source, and the emission that sewage can not appear basically has reduced the treatment cost of heavy metal soil.

In order to achieve the above technical effects, the technical scheme of the utility model is that:

a heavy metal contaminated soil remediation system comprises a spraying mechanism, wherein an earth and stone screening mechanism is arranged below the spraying mechanism, a conical feed hopper is arranged below the earth and stone screening mechanism, a mud-water separation mechanism is arranged below the conical feed hopper, and the mud-water separation mechanism is communicated with a concrete thickener; the spraying mechanism comprises a water tank, the water tank is communicated with a water inlet pipe, and a first water pump and a plurality of spraying heads are mounted on the water inlet pipe; the water tank is also communicated with a tap water pipe; the concrete thickener is communicated with the water tank through a return pipe; the return pipe is provided with a return pump.

The soil and stone screening mechanism comprises a screen plate, and a plurality of screen holes are formed on the screen plate; a baffle is fixed on the periphery of the sieve plate, and a stone outlet is arranged at one end of the sieve plate; the sieve plate is connected with a vibration mechanism.

The vibration mechanism is a vibrator.

The vibration mechanism comprises a connecting rod connected with the sieve plate, the connecting rod is connected with a crank through a bearing, and the crank is connected with a rotating motor; the bottom of the sieve plate is provided with rollers which are positioned on the supporting frame.

In a further improvement, a plurality of barrier strips are fixed in the width direction of the sieve plate, and the height of each barrier strip is less than or equal to 2cm and more than or equal to 1 cm.

Further improvement, a stone conveyor belt is arranged in cooperation with the stone outlet.

The mud-water separating mechanism comprises a feeding ring, the feeding ring is connected with a baffle disc through a connecting rod, and a discharge hole is formed between the baffle disc and the feeding ring; the feeding ring is connected with an inverted U-shaped centrifugal cylinder, and a plurality of filter holes are formed in the inverted U-shaped centrifugal cylinder; an inner cylinder body is fixedly arranged below the inverted U-shaped centrifugal cylinder, and an outer cylinder body is fixed outside the inner cylinder body; the water storage space between the outer barrel and the inner barrel is communicated with the concrete thickener through a water outlet pipe; a second water pump is arranged on the water outlet pipe; the feeding ring is connected with a rotary power device through a transmission belt.

In a further improvement, the rotary power device is a motor.

The further improvement is that a concrete raw material conveying belt is arranged by matching with a concrete thickener.

The improved water tank is also communicated with a flocculation tank, and the bottom of the water inlet pipe is provided with a filter screen.

The utility model has the advantages as follows:

the utility model discloses utilize the adsorption efficiency of concrete, adsorb and use the water that contains the heavy metal that soil improvement in-process produced, do not use flocculating agent or other chemicals basically to when accomplishing the heavy metal fixed, saved the water source, and the emission that sewage can not appear basically has reduced the treatment cost of heavy metal soil.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the vibration mechanism of the present invention;

fig. 3 is a schematic structural diagram of the mud-water separation mechanism of the present invention.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the following embodiments and accompanying drawings, and the components or devices in the following embodiments are all general standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.

Example 1

As shown in fig. 1, 2 and 3, the heavy metal contaminated soil remediation system comprises a spraying mechanism 1, wherein an earth and stone screening mechanism 2 is installed below the spraying mechanism 1, a conical feed hopper 5 is installed below the earth and stone screening mechanism 2, a mud-water separation mechanism 3 is installed below the conical feed hopper 5, and the mud-water separation mechanism 3 is communicated with a concrete thickener 4; the spraying mechanism 1 comprises a water tank 11, the water tank 11 is communicated with a water inlet pipe 12, and a first water pump 13 and a plurality of spraying heads 14 are installed on the water inlet pipe 12; the water tank 11 is also communicated with a tap water pipe 15; the concrete thickener 4 is communicated with the water tank 11 through a return pipe 41; the return pipe 41 is provided with a return pump 42. The bottom of the water inlet pipe 12 is provided with a filter screen 16.

The utility model discloses application method as follows: crushed soil is sprinkled on the soil and stone screening mechanism 2, then spray the water that the mechanism 1 absorbed in the water tank 11 and spray, make the heavy metal dissolve in the aquatic, soil forms mud after adding water, soil is separated out after mud water separating mechanism 3, and water is added into concrete thickener 4 and other raw materials of concrete, mix and stir the dense concrete that forms in concrete thickener 4 like sand grain, stone, cement, etc. in the stirring process, the heavy metal of aquatic is adsorbed by the concrete and is fixed to in the concrete, and with the remaining water of concrete mixture back again the suction to the water tank in, by cyclic utilization, through 15 moisturizing of water pipe when the water yield is not enough in the water tank. Because the heavy metal is adsorbed and solidified in the concrete, the heavy metal can not enter the human body through food and the like to cause harm to the human body. The filter screen 16 is used for preventing the supernatant fluid after the thickening of the thickener from containing sand and stone to block the spray header 14.

The sewage after the concrete is dissolved in the process is continuously absorbed and adsorbed by the concrete, so that the discharge of the sewage is basically avoided, the pollution of the sewage discharge is avoided, a flocculating agent is not required to be used, the treatment cost is reduced, and meanwhile, the water resource is fully utilized.

The soil and stone screening mechanism 2 comprises a screen plate 21, and a plurality of screen holes 22 are formed on the screen plate 21; a baffle plate 23 is fixed on the periphery of the sieve plate 21, and a stone outlet 211 is arranged at one end of the sieve plate; the sieve plate 21 is connected with a vibrating mechanism. The vibration mechanism is a vibrator or the following structure: comprises a connecting rod 24 connected with the sieve plate 21, the connecting rod 24 is connected with a crank 25 through a bearing, and the crank 25 is connected with a rotating motor 26; the bottom of the screen deck 21 is fitted with rollers 27, the rollers 27 resting on a supporting frame 28. The width direction of the sieve plate 21 is fixed with a plurality of barrier strips 210, and the height of the barrier strips is less than or equal to 2cm and more than or equal to 1 cm.

After soil is placed on the sieve plate 21, the rotation of the crank causes the vibration of the sieve plate, so that the mixed soil is continuously sieved, and impurities such as stones or plastics in the soil are blocked and discharged from the stone outlet 211. The stone conveyor belt 29 for conveying stones is arranged at the stone outlet 211.

Mud-water separation mechanism 3 can be traditional sedimentation tank, but in order to realize mud-water separation fast, the utility model discloses a structure as follows:

the mud-water separation mechanism 3 comprises a feeding ring 31, the feeding ring 31 is connected with a baffle disc 33 through a connecting rod 32, and a discharge hole 311 is formed between the baffle disc 33 and the feeding ring 31; the feeding ring 31 is connected with an inverted U-shaped centrifugal cylinder 34, and a plurality of filtering holes are formed on the inverted U-shaped centrifugal cylinder 34; an inner cylinder 36 is fixedly arranged below the inverted U-shaped centrifugal cylinder 34, and an outer cylinder 39 is fixed outside the inner cylinder 36; the water storage space 310 between the outer cylinder 39 and the inner cylinder 36 is communicated with the concrete thickener 4 through a water outlet pipe 37; the water outlet pipe 37 is provided with a second water pump 38; the feed ring 31 is connected to a rotary power unit 313 via a drive belt 312. The rotary power unit 313 is a motor.

The concrete thickener 4 is provided with a concrete raw material conveyor belt 43.

After entering the feeding ring 31, the mud is thrown out from the discharge hole 311 and adhered to the inverted U-shaped centrifuge tube 34, and after centrifugation, water in the mud is thrown out, while the soil flows down and falls from the bottom of the inverted U-shaped centrifuge tube 34, and the thrown water enters the water storage space 310 between the outer cylinder 39 and the inner cylinder 36 and is pumped into the concrete thickener 4 as a water source.

The water tank 11 is also communicated with a flocculation tank 6. Because the concrete thickener 4 can generate excessive water after thickening the concrete, if the concrete preparation and the soil purification are not carried out any more, the excessive water is introduced into the flocculation tank 6 to be purified by the traditional process.

The above-mentioned is only a concrete direction embodiment of the utility model, nevertheless the utility model discloses a design concept is not limited to this, and all utilize this design right the utility model discloses carry out immaterial change, all should belong to the action of infringing the scope of protection of the utility model.

Claims

1. A heavy metal contaminated soil remediation system comprises a spraying mechanism (1), wherein an earth and stone screening mechanism (2) is installed below the spraying mechanism (1), a conical feed hopper (5) is installed below the earth and stone screening mechanism (2), and a mud-water separation mechanism (3) is installed below the conical feed hopper (5), and is characterized in that the mud-water separation mechanism (3) is communicated with a concrete thickener (4); the spraying mechanism (1) comprises a water tank (11), the water tank (11) is communicated with a water inlet pipe (12), and a first water pump (13) and a plurality of spraying heads (14) are installed on the water inlet pipe (12); the water tank (11) is also communicated with a tap water pipe (15); the concrete thickener (4) is communicated with the water tank (11) through a return pipe (41); a return pump (42) is mounted on the return pipe (41).

2. The heavy metal contaminated soil remediation system of claim 1, wherein the soil and stone screening mechanism (2) comprises a screen plate (21), wherein a plurality of screen holes (22) are formed on the screen plate (21); a baffle plate (23) is fixed on the periphery of the sieve plate (21), and a stone outlet (211) is arranged at one end of the sieve plate; the sieve plate (21) is connected with a vibration mechanism.

3. The heavy metal contaminated soil remediation system of claim 2 wherein said vibration mechanism is a vibrator.

4. The heavy metal contaminated soil remediation system of claim 2, wherein said vibration mechanism comprises a connecting rod (24) connected to the screen deck (21), the connecting rod (24) being connected to a crank (25) via a bearing, the crank (25) being connected to a rotating motor (26); the bottom of the sieve plate (21) is provided with a roller (27), and the roller (27) is arranged on a supporting frame (28).

5. The heavy metal contaminated soil remediation system of claim 4, wherein a plurality of bars (210) are fixed to the sieve plate (21) in the width direction, and the height of the bars is not more than 2cm and not less than 1 cm.

6. The heavy metal contaminated soil remediation system of claim 2 wherein a stone conveyor (29) is mounted in cooperation with the stone outlet (211).

7. The heavy metal contaminated soil remediation system of claim 1, wherein the mud-water separation mechanism (3) comprises a feed ring (31), the feed ring (31) is connected with a baffle disc (33) through a connecting rod (32), and a discharge hole (311) is formed between the baffle disc (33) and the feed ring (31); the feeding ring (31) is connected with an inverted U-shaped centrifugal cylinder (34), and a plurality of filtering holes are formed in the inverted U-shaped centrifugal cylinder (34); an inner cylinder body (36) is fixedly arranged below the inverted U-shaped centrifugal cylinder (34), and an outer cylinder body (39) is fixed outside the inner cylinder body (36); a water storage space (310) between the outer cylinder body (39) and the inner cylinder body (36) is communicated with the concrete thickener (4) through a water outlet pipe (37); a second water pump (38) is arranged on the water outlet pipe (37); the feeding ring (31) is connected with a rotary power device (313) through a transmission belt (312).

8. The heavy metal contaminated soil remediation system of claim 7, wherein said rotary power unit (313) is an electric motor.

9. The heavy metal contaminated soil remediation system of claim 1, wherein a concrete raw material conveyor belt (43) is installed in cooperation with the concrete thickener (4).

10. The heavy metal contaminated soil remediation system of claim 1, wherein the water tank (11) is further in communication with a flocculation basin (6), and a filter screen (16) is installed at the bottom of the water inlet pipe (12).