CN217528674U - Heavy metal contaminated soil leaching and repairing equipment - Google Patents
Heavy metal contaminated soil leaching and repairing equipment Download PDFInfo
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- CN217528674U CN217528674U CN202123363527.5U CN202123363527U CN217528674U CN 217528674 U CN217528674 U CN 217528674U CN 202123363527 U CN202123363527 U CN 202123363527U CN 217528674 U CN217528674 U CN 217528674U
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Abstract
The utility model relates to a leaching remediation equipment for heavy metal contaminated soil, which feeds the heavy metal contaminated soil to be treated by a feeding unit and supplies the heavy metal contaminated soil to be treated according to a preset speed, screens the heavy metal contaminated soil to be treated by a multi-stage screening unit according to a preset standard, leaches and repairs the screened fine materials by a leaching remediation unit, and processes the leached and repaired products by a post-processing unit; the operation is controlled by a controller. The utility model can work continuously with high efficiency; the removal rate of heavy metals in the soil is high, and the environment cannot be polluted; heavy metals are concentrated in small-particle soil (including slag) through screening equipment, then the small-particle soil is subjected to filter pressing and cooperative treatment, the residual level of the heavy metals in large-particle materials is low, the large-particle materials meet the corresponding national standard, and the large-particle materials can be recycled; the method is suitable for repairing soil polluted by various heavy metals including arsenic, and is particularly suitable for application of the polluted soil of steel plants.
Description
Technical Field
The utility model relates to a pollute the technical field of the regeneration of soil, in particular to drip washing repair equipment of heavy metal contaminated soil.
Background
The soil is composed of various granular minerals, organic substances, moisture, air, microorganisms, and the like. With the development of cities and the continuously promoted industrialization process, the problem of heavy metal pollution of soil is becoming more and more serious due to the development of a large number of industrial enterprises, particularly the establishment of steel plants. As a resource-intensive industry, the steel industry has large production scale and complex process, raw materials and fuels in the production process are easy to generate dust in the transportation, loading and unloading and processing processes, harmful smoke is easy to generate in the sintering, smelting and steel rolling processes, and the condition of illegal landfill of waste residues is also often caused by poor early environmental protection consciousness of a steel plant. Taking arsenic pollution as an example, a certain amount of arsenic trioxide dust exists in flue dust or slag of a smelting furnace, the land around a steel plant can be gradually polluted in the production process, heavy metal pollution to the soil is caused, and symptoms such as encephalasthenia, gastrointestinal dysfunction, acroanesthesia and the like can be caused by chronic arsenic poisoning.
The pollution left by steel plant production not only seriously affects the secondary development and utilization of land, but also finally affects the health of people. Therefore, it is necessary to adopt reasonable technical means to repair the contaminated soil, so as to effectively control the risks of human health and ecological environment caused by soil pollution.
The ectopic soil leaching is a technology for separating heavy polluted soil components or transferring pollutants from soil phase to liquid phase by adding water or a proper synergist and adopting means such as physical separation or synergistic leaching, and the leaching treatment can effectively reduce the treatment amount of the polluted soil and realize reduction. The ectopic leaching technology is suitable for treating the soil polluted by heavy metal, semi-volatile and nonvolatile organic matters, and a matched gas collecting and treating facility is adopted when the soil polluted by the volatile organic matters is treated.
However, according to the existing research and application at present, the soil ex-situ leaching cannot realize automatic remediation for the polluted soil, and in the remediation process, the chemical adding, stirring and the like are realized through manual operation, and meanwhile, most of the existing devices are inconvenient to operate and low in remediation efficiency.
Further, according to the existing research and application, the leaching technology is mainly used for soil remediation, while in the early large-scale steel plant, due to extensive production and weak environmental awareness, the steel plant and the periphery thereof are polluted to different degrees, especially in some places, illegal landfill of waste residues is caused, and corresponding technical application is still lacked for the polluted soil containing the waste residues.
SUMMERY OF THE UTILITY MODEL
The utility model provides a problem that exists among the prior art, provide an optimize drip washing repair equipment of heavy metal contaminated soil of structure, can effectively get rid of the heavy metal pollutant including arsenic to but continuous operation, drip washing prosthetic devices of efficient heavy metal contaminated soil is especially to the contaminated soil who contains the waste residue.
The utility model discloses the technical scheme who adopts is, a drip washing repair equipment of heavy metal contaminated soil, equipment is including setting up in order:
the feeding unit is used for feeding the heavy metal polluted soil to be treated and supplying the heavy metal polluted soil at a preset speed;
the multi-stage screening unit is used for screening the heavy metal polluted soil to be treated according to a preset standard;
the leaching and repairing unit is used for leaching and repairing the screened fine materials;
the post-treatment unit is used for treating the product after the leaching repair;
the feeding unit, the multistage screening unit, the leaching and repairing unit and the post-processing unit are arranged in a matched mode with the controller.
Preferably, the feeding unit comprises a hopper, the output end of the hopper is matched with the belt conveyor, and the tail end of the belt conveyor is matched with the input end of the multi-stage screening unit; the belt conveyor is matched with the controller.
Preferably, the multistage screening unit comprises a mud removing machine and a multistage vibration screening mechanism which are sequentially arranged, and a mud outlet of the mud removing machine is matched with an input end of the multistage vibration screening mechanism; the mud removing machine and the multistage vibration screening mechanism are arranged in a matching mode with the controller.
Preferably, the multistage vibrating and screening mechanism comprises a first-stage vibrating screen and a second-stage vibrating screen which are sequentially arranged, a first-stage stirring tank is arranged between a slurry outlet of the first-stage vibrating screen and an input end of the second-stage vibrating screen in a matched manner, a slurry outlet of the second-stage vibrating screen is arranged in a matched manner with an input end of the second-stage stirring tank, and an output end of the second-stage stirring tank is arranged in a matched manner with the leaching repair unit; the first-stage vibrating screen, the second-stage vibrating screen, the first-stage stirring tank and the second-stage stirring tank are arranged in a matched mode with the controller.
Preferably, the leaching repair unit comprises a first-stage sedimentation tank which is matched with the output end of the multi-stage screening unit, the slurry outlet of the first-stage sedimentation tank is matched with the input end of the reaction tank, and the slurry outlet of the reaction tank is matched with the input end of the second-stage sedimentation tank; and a sludge outlet of the primary sedimentation tank, a sludge outlet of the secondary sedimentation tank and a water outlet of the secondary sedimentation tank are matched with the post-treatment unit.
Preferably, a switching mechanism is arranged by matching the slurry outlet of the primary sedimentation tank, the slurry outlet of the reaction tank, the sludge outlet of the primary sedimentation tank, the sludge outlet of the secondary sedimentation tank and the water outlet of the secondary sedimentation tank, and the switching mechanism is matched with the controller.
Preferably, dosing devices are arranged corresponding to the primary sedimentation tank, the reaction tank and the secondary sedimentation tank.
Preferably, the post-treatment unit comprises a sludge treatment mechanism and a water treatment mechanism.
Preferably, the sludge treatment mechanism comprises a sludge conditioning tank which is matched with a sludge outlet of the leaching and repairing unit, and an outlet of the sludge conditioning tank is matched with a plate-and-frame filter press; the plate-and-frame filter press is matched with the controller.
Preferably, the water treatment mechanism includes the sand filtration jar that sets up with the delivery port cooperation of drip washing repair unit, lead to the cooperation of filtrate water tank and set up between the output of sand filtration jar and plate and frame filter press, the output of sand filtration jar sets up with the input cooperation of reuse water pond.
The utility model relates to a drip washing repair equipment of heavy metal contaminated soil of optimized structure, through the feed unit with wait to handle heavy metal contaminated soil pan feeding and supply according to the speed of predetermineeing, sieve the heavy metal contaminated soil of waiting to handle according to the predetermined standard with multistage screening unit, drip washing repair the fines after screening with drip washing repair unit, the product after the aftertreatment unit is handled after the drip washing repair; the controller controls the operations of the feeding unit, the multistage screening unit, the leaching and repairing unit and the post-treatment unit.
The beneficial effects of the utility model reside in that:
(1) Continuous work can be carried out, and the efficiency is high;
(2) The removal rate of heavy metals in soil is high, taking arsenic as an example, on the basis of full leaching and stirring, more than 52% of arsenic in soil can be transferred into leaching solution through the leaching solution, then the leaching solution is purified, so that the heavy metals are converted into polymer precipitate, and waste liquid after water treatment can be used as reuse water and cannot pollute the environment;
(3) Heavy metals are concentrated in small-particle soil (including slag) through screening equipment, then the small-particle soil is subjected to filter pressing and cooperative treatment, the residual level of the heavy metals in large-particle materials is low, the large-particle materials meet the corresponding national standard, and the large-particle materials can be recycled;
(4) The method is suitable for repairing soil polluted by various heavy metals including arsenic, and is particularly suitable for application of the polluted soil of steel plants.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the scope of the present invention is not limited thereto.
The utility model relates to a drip washing repair equipment of heavy metal contaminated soil, feed unit, multi-stage screening unit, drip washing repair unit and aftertreatment unit set up in order in the equipment, accomplish different works in proper order.
The feeding unit, the multistage screening unit, the leaching and repairing unit and the post-processing unit are arranged in a matched mode with the controller.
In the present invention, it should be noted that the work done by the controller is the conventional control operation, and the technical content of the present invention is not realized by the improvement of the computer.
The feeding unit is used for feeding the heavy metal polluted soil to be treated and supplying the heavy metal polluted soil at a preset speed;
the feeding unit comprises a hopper 11, the output end of the hopper 11 is matched with a belt conveyor 12, and the tail end of the belt conveyor 12 is matched with the input end of the multi-stage screening unit; the belt conveyor 12 is matched with the controller.
The utility model discloses in, hopper 11 is through cooperating with belt feeder 12, utilizes the transmission speed of controller control belt feeder 12 for the pan feeding of pending heavy metal contaminated soil is gone on according to predetermined speed.
The multi-stage screening unit is used for screening the heavy metal polluted soil to be treated according to a preset standard;
the multistage screening unit comprises a mud removing machine 21 and a multistage vibration screening mechanism which are sequentially arranged, wherein a slurry outlet of the mud removing machine 21 is matched with an input end of the multistage vibration screening mechanism; the mud removing machine 21 and the multistage vibration screening mechanism are arranged in a matching mode with the controller.
The multistage vibrating screening mechanism comprises a first-stage vibrating screen 22 and a second-stage vibrating screen 23 which are sequentially arranged, a first-stage stirring tank 31 is arranged between a slurry outlet of the first-stage vibrating screen 22 and an input end of the second-stage vibrating screen 23 in a matched mode, a slurry outlet of the second-stage vibrating screen 23 is arranged in a matched mode with an input end of a second-stage stirring tank 32, and an output end of the second-stage stirring tank 32 is arranged in a matched mode with a leaching repair unit; the first-stage vibrating screen 22, the second-stage vibrating screen 23, the first-stage stirring tank 31 and the second-stage stirring tank 32 are arranged in a matched mode with the controller.
The utility model discloses in to separate mud machine 21 and treat various grit, rock, mineral and metal and nonmetal cubic material surface earth and impurity washing and getting rid of in the heavy metal pollution soil of handling, enter into the multistage screening unit afterwards.
The utility model discloses in, can carry out multistage screening and corresponding processing to soil, promote repair effect, include:
the soil is divided into two types by the mud remover 21 according to whether the grain size is larger than 4cm, the materials with the grain size larger than 4cm are leached and screened, and then are led out, and the materials with the grain size smaller than 4cm enter the primary vibrating screen 22;
the first-stage vibrating screen 22 divides the soil into two types according to whether the particle size is larger than 2mm, the materials with the particle size larger than 2mm are leached and screened, and then are discharged, and the materials with the particle size smaller than 2mm enter the second-stage vibrating screen 23;
the second-stage vibrating screen 23 divides the soil into two types according to whether the particle size is larger than 0.3mm, the materials with the particle size larger than 0.3mm are leached and screened and then are led out, and the materials with the particle size smaller than 0.3mm enter the stirring tank, so that the materials with the particle size larger than 4cm, larger than 2mm and smaller than 4cm, larger than 0.3mm and smaller than 2mm can be leached and stirred in a grading manner, the soil can be refined, and the subsequent leaching treatment efficiency is facilitated.
The utility model discloses in, one-level shale shaker 22 is located the oblique top of second grade shale shaker 23, can reduce equipment energy consumption and equipment area.
The utility model discloses in, the screen cloth of one-level shale shaker 22 and second grade shale shaker 23 adopts the polyurethane net check, and the screen cloth is installed in stainless steel metal sieve fill with certain inclination.
The utility model discloses in, the installation angle of one-level shale shaker 22 and second grade shale shaker 23 is 5 ~10 to this increases the time of material drip washing.
The utility model discloses in, the material exit of separating mud machine 21 and multistage vibration screening mechanism all is equipped with sprays the mouth for drip washing material and reduction raise dust secondary pollution.
The utility model discloses in, one-level agitator tank 31 and second grade agitator tank 32 adopt the anticorrosive carbon steel of high strength, the inside mixer of agitator tank adopts double-deck paddle, and the intensive mixing material is ensured to upper and lower convection current.
The utility model discloses in, the agitator tank volume is 20m 3 。
The leaching and repairing unit is used for leaching and repairing the screened fine materials;
the leaching repair unit comprises a first-stage sedimentation tank 62 matched with the output end of the multi-stage screening unit, the slurry outlet of the first-stage sedimentation tank 62 is matched with the input end of a reaction tank 63, and the slurry outlet of the reaction tank 63 is matched with the input end of a second-stage sedimentation tank 64; the sludge outlet of the first-stage sedimentation tank 62, the sludge outlet of the second-stage sedimentation tank 64 and the water outlet of the second-stage sedimentation tank 64 are matched with the post-treatment unit.
And a switching mechanism is arranged by matching the slurry outlet of the primary sedimentation tank 62, the slurry outlet of the reaction tank 63, the slurry outlet of the primary sedimentation tank 62, the slurry outlet of the secondary sedimentation tank 64 and the water outlet of the secondary sedimentation tank 64, and the switching mechanism is matched with the controller.
And a dosing device 51 is arranged corresponding to the primary sedimentation tank 62, the reaction tank 63 and the secondary sedimentation tank 64.
In the utility model, taking arsenic contaminated soil as an example, the solid-to-liquid ratio of the stirring tank is 8, the stirring time of the stirring tank is 25min, the stirring tank enters the primary sedimentation tank 62 to be added with chemicals after completion, the eluent in the chemical adding device 51 is KH2PO4, and the flow rate is controlled at 10m3/h; before the eluent is used, the pH value of the eluent is adjusted to about 5 by citric acid.
The utility model discloses in, the flocculating agent is PAC and PAM, has advantages such as the floc that forms is closely knit, subsides fast, effectual and nontoxic, and generally speaking, PAC's the input is 150mg/L, and PAM's the input is 0.5mg/L.
In the utility model, the dosing device 51 can be generally configured to be three, and the continuous dosing mode is adopted for working.
The post-treatment unit is used for treating the product after the leaching repair;
the post-treatment unit comprises a sludge treatment mechanism and a water treatment mechanism.
The sludge treatment mechanism comprises a sludge conditioning tank 33 which is matched with a sludge outlet of the leaching repair unit, and a plate-and-frame filter press 41 is matched with an outlet of the sludge conditioning tank 33; the plate and frame filter press 41 is matched with the controller.
The water treatment mechanism includes the sand filtration jar 65 that sets up with the delivery port cooperation of drip washing repair unit, lead to the cooperation of filtrate water tank 61 between the output of sand filtration jar 65 and plate and frame filter press 41 and set up, the output of sand filtration jar 65 sets up with the input cooperation of reuse water tank 66.
In the utility model, the water quality of the treated supernatant and the filtrate at the outlet of the waste liquid of the plate-and-frame filter press 41 are treated by water purifying equipment, and the water is sent to a reuse water tank 66 after the water body is purified to reach the standard and meets the requirement of reuse water, so that the dosing device 51 uses water and leaches the water; the reuse water is finally collected and disposed in a unified way, and the secondary pollution caused by directly discharging the waste water into the environment is prevented.
The utility model discloses in, all equipment and pipelines all use high temperature resistant, acid resistance's protector, all are provided with the control valve on the pipeline.
In the utility model, the arsenic-polluted soil is mainly taken as an example for explanation;
during the use, will pollute during soil drops into hopper 11, then hopper 11 supplies soil to the multi-stage screening unit, and after the screening, coarse fodder, one-level fine material and second grade fine material export through the different exports of multi-stage screening unit, include:
the soil enters the second-stage stirring tank 32 through the fine material outlet, the soil enters the first-stage sedimentation tank 62 after being stirred by the second-stage stirring tank 32, and meanwhile, the corresponding eluting agent in the chemical adding device 51 enters the eluting repair unit to elute the material;
the other path enters a secondary sedimentation tank 64 to drip wash the materials, and a flocculating agent is mixed with water and then enters the secondary sedimentation tank 64 to treat the materials;
thus, the pollutants are removed by leaching the stone, partial pollutants are removed by stirring, leaching and precipitating the soil, the pollution slurry in the leaching equipment is recycled to the stirring tank and then flows into the sedimentation tank, and finally, the water in the sedimentation tank is purified and returned to the water tank after meeting the requirement of reuse water, so that the water is recycled, the pollutants can be recycled, and the secondary pollution is prevented.
Claims (9)
1. The utility model provides a drip washing repair equipment of heavy metal contaminated soil which characterized in that: the equipment comprises the following components arranged in sequence:
the feeding unit is used for feeding the heavy metal polluted soil to be treated and supplying the heavy metal polluted soil at a preset speed;
the multi-stage screening unit is used for screening the heavy metal polluted soil to be treated according to a preset standard; the multistage screening unit comprises a mud removing machine and a multistage vibration screening mechanism which are sequentially arranged, and a mud outlet of the mud removing machine is matched with an input end of the multistage vibration screening mechanism; the mud removing machine and the multistage vibration screening mechanism are matched with the controller;
the leaching and repairing unit is used for leaching and repairing the screened fine materials;
the post-treatment unit is used for treating the product after the leaching repair;
the feeding unit, the multistage screening unit, the leaching and repairing unit and the post-processing unit are arranged in a matched mode with the controller.
2. The leaching remediation equipment for heavy metal contaminated soil according to claim 1, wherein: the feeding unit comprises a hopper, the output end of the hopper is matched with the belt conveyor, and the tail end of the belt conveyor is matched with the input end of the multistage screening unit; the belt conveyor is matched with the controller.
3. The leaching remediation equipment for heavy metal contaminated soil according to claim 1, wherein: the multistage vibrating screening mechanism comprises a first-stage vibrating screen and a second-stage vibrating screen which are sequentially arranged, a first-stage stirring tank is arranged between a slurry outlet of the first-stage vibrating screen and an input end of the second-stage vibrating screen in a matched mode, a slurry outlet of the second-stage vibrating screen is arranged in a matched mode with an input end of the second-stage stirring tank, and an output end of the second-stage stirring tank is arranged in a matched mode with the leaching repair unit; the first-stage vibrating screen, the second-stage vibrating screen, the first-stage stirring tank and the second-stage stirring tank are arranged in a matched mode with the controller.
4. The leaching remediation equipment for heavy metal contaminated soil according to claim 1, wherein: the leaching repair unit comprises a primary sedimentation tank matched with the output end of the multi-stage screening unit, the slurry outlet of the primary sedimentation tank is matched with the input end of the reaction tank, and the slurry outlet of the reaction tank is matched with the input end of the secondary sedimentation tank; and a sludge outlet of the primary sedimentation tank, a sludge outlet of the secondary sedimentation tank and a water outlet of the secondary sedimentation tank are matched with the post-treatment unit.
5. The leaching remediation equipment for heavy metal contaminated soil according to claim 4, wherein: the cooperation the play thick liquid mouth of one-level sedimentation tank, the play thick liquid mouth of reaction tank, the play mud mouth of one-level sedimentation tank, the play mud mouth of second grade sedimentation tank and the delivery port of second grade sedimentation tank are equipped with on-off mechanism, on-off mechanism and controller cooperation setting.
6. The leaching remediation equipment for heavy metal contaminated soil according to claim 4, wherein: and dosing devices are arranged corresponding to the primary sedimentation tank, the reaction tank and the secondary sedimentation tank.
7. The leaching remediation equipment for heavy metal contaminated soil according to claim 1, wherein: the post-treatment unit comprises a sludge treatment mechanism and a water treatment mechanism.
8. The leaching remediation equipment for heavy metal contaminated soil according to claim 7, wherein: the sludge treatment mechanism comprises a sludge conditioning tank which is matched with a sludge outlet of the leaching repair unit, and a plate-and-frame filter press is arranged at the outlet of the sludge conditioning tank in a matching manner; the plate-and-frame filter press is matched with the controller.
9. The leaching remediation equipment for heavy metal contaminated soil according to claim 8, wherein: the water treatment mechanism comprises a sand filter tank which is matched with the water outlet of the leaching repair unit, the sand filter tank and the output end of the plate-and-frame filter press are matched with each other through a filter liquid water tank, and the output end of the sand filter tank is matched with the input end of the reuse water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123363527.5U CN217528674U (en) | 2021-12-29 | 2021-12-29 | Heavy metal contaminated soil leaching and repairing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123363527.5U CN217528674U (en) | 2021-12-29 | 2021-12-29 | Heavy metal contaminated soil leaching and repairing equipment |
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| Publication Number | Publication Date |
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| CN217528674U true CN217528674U (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123363527.5U Active CN217528674U (en) | 2021-12-29 | 2021-12-29 | Heavy metal contaminated soil leaching and repairing equipment |
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| CN (1) | CN217528674U (en) |
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2021
- 2021-12-29 CN CN202123363527.5U patent/CN217528674U/en active Active
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