CN113828626A - Leaching treatment process of heavy metal-organic contaminated soil - Google Patents
Leaching treatment process of heavy metal-organic contaminated soil Download PDFInfo
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- CN113828626A CN113828626A CN202111316622.1A CN202111316622A CN113828626A CN 113828626 A CN113828626 A CN 113828626A CN 202111316622 A CN202111316622 A CN 202111316622A CN 113828626 A CN113828626 A CN 113828626A
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- 239000002689 soil Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 49
- 238000002386 leaching Methods 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000012216 screening Methods 0.000 claims abstract description 30
- 238000005406 washing Methods 0.000 claims abstract description 29
- 239000004575 stone Substances 0.000 claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 21
- 231100000719 pollutant Toxicity 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 20
- 230000002195 synergetic effect Effects 0.000 claims abstract description 19
- 238000004090 dissolution Methods 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 10
- 239000011362 coarse particle Substances 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims abstract description 7
- 239000010419 fine particle Substances 0.000 claims abstract description 4
- 239000012065 filter cake Substances 0.000 claims abstract description 3
- 238000001556 precipitation Methods 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 15
- 239000002957 persistent organic pollutant Substances 0.000 claims description 15
- 229910001385 heavy metal Inorganic materials 0.000 claims description 14
- 239000010865 sewage Substances 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 239000003814 drug Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 6
- 238000005201 scrubbing Methods 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 3
- 238000006062 fragmentation reaction Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000000356 contaminant Substances 0.000 claims 4
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000005067 remediation Methods 0.000 abstract 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000002609 medium Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011068 loading method Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000004062 sedimentation Methods 0.000 description 2
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- 230000001360 synchronised effect Effects 0.000 description 2
- 241001417527 Pempheridae Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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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
Abstract
The invention discloses a leaching treatment process of heavy metal-organic contaminated soil, which comprises the following steps: selectively crushing the soil to be repaired while screening, conveying the undersize materials to a buffer bin for temporary storage, conveying the undersize materials to roller stone washing equipment to be uniformly mixed with leacheate, and conveying the undersize materials to vibration screening equipment to obtain oversize particles and undersize suspension; the middle-block spiral sand washing equipment cleans particles on the screen to obtain a clean middle block, undersize suspension is sent to a water medium cyclone for classification, then underflow is output to coarse-particle spiral sand washing equipment for cleaning, overflow is output to synergistic dissolution equipment for reaction treatment, fine-particle materials after reaction are precipitated and filtered to obtain leacheate and filter cakes, and the dissolved pollutants are subjected to subsequent treatment. By adopting the technical scheme, the heavy metal-organic pollution is synchronously removed, the remediation process is continuous and stable, the process is simple, the remediation efficiency is high, and the soil to be remediated has wide adaptability.
Description
Technical Field
The invention relates to the technical field of pollution treatment, in particular to a leaching treatment process of heavy metal-organic polluted soil.
Background
At present, in the leaching treatment process of domestic and foreign heavy metal-organic polluted soil, the main mode is to remove heavy metal organic pollutants through the stirring process of synergistic dissolution equipment and remove organic pollutants through the flotation mode. Therefore, in the completion process, the heavy metal-organic compound contaminated soil can complete corresponding pollutant removal work by at least two leaching reactions.
The two-step leaching increases the load of rear-end sewage treatment equipment, and the large-water-quantity low-concentration pollutants are not easy to remove with low efficiency, and in addition, part of the conventional leaching treatment devices are not perfect in implementation details, so that the low pollutant removal efficiency is easy to cause, multiple times of leaching treatment are needed, the production efficiency is low, and even continuous and stable production cannot be realized.
Disclosure of Invention
Aiming at the problems, the invention provides a leaching treatment process of heavy metal-organic polluted soil, which comprises the steps of optimizing the treatment process, selectively crushing soil, crushing large soil with lower strength into small pieces so as to be leached and repaired together with small repairable soil, stirring and mixing the soil with leacheate, grading and screening, synergistic dissolution, precipitation, filtration and sewage treatment to realize synchronous removal of heavy metal-organic pollution, realizing continuous and stable repairing process, and having low production cost, high safety, simple process, high repairing efficiency and wide adaptability to soil to be repaired.
In order to achieve the aim, the invention provides a leaching treatment process of heavy metal-organic polluted soil, which comprises the following steps:
selectively crushing and screening soil to be restored, discharging large blocks of raw stones and construction residues which are not crushed through an oversize material channel for piling, and conveying small blocks of crushed soil to a buffer bin for temporary storage through an undersize material channel;
conveying the temporarily stored undersize materials to roller stone washing equipment, stirring and mixing the undersize materials with a leaching agent to form particles and suspension, and transferring the particles and the suspension to vibration screening equipment for grading to obtain oversize particles and undersize suspension;
conveying the particles on the sieve to a middle-block spiral sand washing device, further scrubbing the particles by newly added clear water to obtain a cleaned middle-block material, discharging the cleaned middle-block material out of a pile, and conveying the suspension under the sieve to a water medium cyclone for classification;
after classifying the undersize suspension, outputting the underflow of the water medium cyclone to a coarse particle spiral sand washing device, adding clear water for scrubbing, discharging and piling the cleaned coarse particle materials, outputting the overflow of the water medium cyclone to a synergistic dissolution device, adding a medicament configured by a medicament adding device, mixing, and configuring to a preset reaction condition for reaction treatment;
dissolving heavy metal pollutants into a liquid phase by stirring of the synergistic dissolution equipment, adjusting the air intake to generate micro bubbles with different quantities and sizes, and transferring the micro bubbles adsorbing organic pollutants into a foam water flow channel to synchronously remove the heavy metal pollutants and the organic pollutants;
the synergistic dissolution equipment dissolves out the pollutants through reaction, the fine particle materials after the reaction are sequentially output to the precipitation equipment and the filtering equipment for precipitation and filtration to obtain leacheate and filter press filter cakes, and the organic pollutants dissolved out in the reaction process and the heavy metal pollutants transferred to the liquid phase are conveyed to the sewage treatment equipment for treatment.
In the above technical solution, preferably, the leaching treatment process of the heavy metal-organic contaminated soil further includes:
and conveying part of the leacheate obtained by precipitation and filtration to the roller stone washing equipment and the vibration screening equipment for recycling, and conveying part of the leacheate to the sewage treatment equipment for treatment.
In the technical scheme, preferably, in the process of selectively crushing and screening the soil to be repaired, large soil with low strength is crushed into small soil to enter an undersize material channel, and undersize materials are conveyed to a buffer bin for temporary storage;
the large-block raw stone and the building slag with higher strength have no fragmentations, so that the large-block raw stone and the building slag are discharged from the discharge end through the oversize material channel to be stockpiled.
In the above technical scheme, preferably, the materials in the buffer bin are uniformly conveyed to the feeding port of the roller stone washing equipment by adjusting the running speed of the material conveying module.
In the above technical scheme, preferably, the feeding speed of the material conveying module is controlled in a linkage manner through the real-time material level height in the roller stone washing equipment.
In the technical scheme, preferably, the screen mesh of the vibration screening device is sprayed with rinsing agent or clear water through the nozzle, so that the screen mesh is cleaned while the material screening efficiency is increased, and the material is prevented from blocking the screen mesh.
In the above technical solution, preferably, an undersize buffer water tank for temporarily storing the undersize suspension is arranged below the support platform of the vibratory screening device, and the angle of the undersize buffer water tank is set to be 15-63 ° according to the position of the undersize buffer water tank, so as to prevent particles in the suspension from adhering to the side wall or sinking to the bottom.
In above-mentioned technical scheme, preferably, adjust the intake through adjusting the air inlet area, based on the negative pressure that impeller centrifugal force effect among the equipment stirring process was dissolved out in the increase produced, produce the microbubble of different quantity and size, because the microbubble is to the selective adsorption of organic pollutant, shift the microbubble that adsorbs organic pollutant to the foam rivers passageway through scraping the bubble mechanism to realize that heavy metal pollutant and organic pollutant's synchronous gets rid of.
In the above technical solution, preferably, the operation of the pumping device is controlled according to a control instruction, so as to realize the diversion and drainage of the suspension between the devices, and at the same time, the diversion and drainage flow rate of the pumping device is detected, so as to perform feedback control on the operation of the pumping device.
Compared with the prior art, the invention has the beneficial effects that: the treatment process is optimized, the soil is selectively crushed, the large soil with lower strength is crushed into small pieces, so that the small pieces of large soil and the small pieces of repairable soil are leached and repaired together, the soil is stirred and mixed with leacheate, classified screening, synergistic dissolution, precipitation, filtration and sewage treatment are carried out, the heavy metal-organic pollution is synchronously removed, the continuous and stable repairing process is realized, the production cost is low, the safety is high, the process is simple, the repairing efficiency is high, and the soil to be repaired has wide adaptability.
Drawings
Fig. 1 is a schematic flow chart of a leaching treatment process for heavy metal-organic contaminated soil according to an embodiment of the present invention.
In the drawings, the correspondence between each component and the reference numeral is:
11. a soil pretreatment module; 12. a buffer bin; 13. a variable frequency dosing belt; 14. a feeding belt conveyor; 15. a roller stone washing device; 16. a vibratory screening device; 17. a medium-sized spiral sand washing device; 18. an aqueous medium cyclone; 19. a synergistic dissolution device; 20. coarse particle spiral sand washing equipment; 21. primary sedimentation equipment; 22. secondary sedimentation equipment; 23. a filtration device; 24. sewage treatment equipment; 25. and a screen lower buffer water tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1, the leaching treatment process for heavy metal-organic contaminated soil provided by the invention comprises the following steps:
selectively crushing and screening soil to be restored, discharging large blocks of raw stones and construction residues which are not crushed through an oversize material channel for piling, and conveying small blocks of crushed soil to a buffer bin 12 through an undersize material channel for temporary storage;
conveying the temporarily stored undersize materials to a roller stone washing device 15, stirring and mixing the undersize materials with a leaching agent to form particles and suspension, and transferring the particles and the suspension to a vibration screening device 16 for grading to obtain oversize particles and undersize suspension;
conveying the particles on the sieve to a middle-block spiral sand washing device 17, further scrubbing the particles by newly added clear water to obtain a cleaned middle-block material, discharging the cleaned middle-block material out for stacking, and conveying the suspension under the sieve to a water medium cyclone 18 for classification;
after classifying the undersize suspension, outputting the underflow of the water medium swirler 18 to a coarse particle spiral sand washing device 20, adding clear water for scrubbing, discharging and piling the cleaned coarse particle materials, outputting the overflow of the water medium swirler 18 to a synergistic dissolution device 19, adding a medicament configured by a medicament adding device for mixing, and configuring to a preset reaction condition for reaction treatment;
heavy metal pollutants are dissolved into a liquid phase by stirring of the synergistic dissolution equipment 19, air intake is adjusted to generate micro bubbles with different quantities and sizes, and the micro bubbles adsorbing organic pollutants are transferred to a foam water flow channel to synchronously remove the heavy metal pollutants and the organic pollutants;
the synergistic dissolution device 19 dissolves the pollutants through reaction, the fine particle materials after the reaction are sequentially output to the precipitation device and the filtering device 23 for precipitation and filtration to obtain leacheate and filter press cakes, and the organic pollutants dissolved out in the reaction process and the heavy metal pollutants transferred to the liquid phase are conveyed to the sewage treatment device 24 for treatment.
In the embodiment, the treatment process is optimized, the soil is selectively crushed by the soil pretreatment module 11, the large soil with low strength is crushed into small pieces so as to be leached and repaired together with the small repairable soil, the soil is stirred and mixed with the leacheate, graded screened, synergistically dissolved out, precipitated, filtered and subjected to sewage treatment, the heavy metal-organic pollution is synchronously removed, the continuous and stable repairing process is realized, the production cost is low, the safety is high, the process is simple, the repairing efficiency is high, and the soil to be repaired has wide adaptability.
The whole treatment process can be controlled by adopting a single chip microcomputer, an embedded controller or a PLC (programmable logic controller) as a control module, and the PLC is preferentially adopted to control the operation and adjustment of each component, so that the normal operation of the whole treatment process is realized.
Specifically, according to the concentration and the dosing amount required by the system, the medicament adding equipment can automatically provide the functions of preparing, adding and uniformly mixing the required rinsing medicament and the water treatment medicament.
The leaching treatment process of the soil can be used for repairing and treating the heavy metal polluted soil, can also be used for repairing and treating the organic polluted soil, and can also be used for repairing and treating the heavy metal and organic composite polluted soil.
In the above embodiment, preferably, in the process of selectively crushing and screening the soil to be repaired, the soil may be fed by an excavator or a loader, in the process of classifying the soil, the soil is selectively crushed, large soil with low strength is crushed into small soil pieces, and then the small soil pieces enter the undersize material channel, and the undersize material is conveyed to the buffer bin 12 through the undersize material channel and conveyed to the buffer bin 12 for temporary storage;
the large-block raw stone and the building slag with higher strength have no fragmentations, so that the large-block raw stone and the building slag are discharged from the discharge end through the oversize material channel to be stockpiled.
In the above embodiment, preferably, the material in the buffer bin 12 is uniformly conveyed to the feeding port of the roller stone washing device 15 by adjusting the running speed of the material conveying module. In the implementation process, accessible frequency conversion dosing belt 13 and material loading belt machine 14 realize, specifically, can set up frequency conversion dosing belt 13 in buffer bin 12 below, frequency conversion dosing belt 13 evenly carries the material in buffer bin 12 to material loading belt machine 14, and frequency conversion dosing belt 13 adjusts the functioning speed of belt machine in order to guarantee even feed through the control signal of PLC feedback, and material loading belt machine 14 carries the material to the pan feeding mouth of cylinder stone washing equipment 15. And corresponding anti-deviation, pull-cord switch, sweeper, sealing cover and protective cover structures can be configured as required.
In the above embodiment, the feeding speed of the material conveying module is preferably controlled in a coordinated manner by means of the real-time level height in the drum stone washing device 15. In the implementation process, can set up material level height monitoring device at the pan feeding mouth of roller stone washing equipment 15, material level height monitoring device links to each other with PLC to according to the pan feeding mouth material level height of the real-time feedback of material level height monitoring device, carry out coordinated control to the feed rate of material transport module, can effectively avoid roller stone washing equipment 15's pan feeding mouth card stifled.
In the above embodiment, the screen openings of the vibratory screening apparatus 16 are preferably cleaned while increasing the efficiency of the material screening by spraying the screen openings with rinsing agent or fresh water through the nozzles to avoid clogging of the screen openings with material. The nozzles can be arranged on a spray rack arranged above the screen surface of the vibrating screening device 16, the nozzles face the direction of the screen surface, and the spray rack is provided with a plurality of nozzles for spraying rinsing agent or cleaning clear water on the whole screen surface.
In the above embodiment, it is preferable that an undersize buffer water tank 25 for temporarily storing the undersize suspension is provided below the support platform of the vibratory screening apparatus 16, and the angle of the undersize buffer water tank 25 is set to 15 ° to 63 ° according to the position of the undersize buffer water tank 25, so as to prevent the particles in the suspension from adhering to the side wall or sinking into the bottom.
In the above embodiment, preferably, the air inlet amount is adjusted by adjusting the air inlet area, and the micro bubbles with different quantities and sizes are generated based on the negative pressure generated by the centrifugal force action of the impeller during the stirring process of the synergistic dissolution device 19.
In the above embodiment, preferably, the leaching treatment process of the heavy metal-organic contaminated soil further includes:
the partial leacheate obtained by precipitation of the precipitation equipment and filtration of the filtration equipment 23 is partially conveyed to the roller stone washing equipment 15 and the vibration screening equipment 16 for recycling, and is partially conveyed to the sewage treatment equipment 24 for treatment, so that the load of the rear-end sewage treatment equipment 24 is reduced, and the concentration of pollutants entering the rear-end sewage treatment equipment 24 is increased, thereby improving the pollutant removal efficiency, and being beneficial to the reduction and efficiency improvement of the rear-end sewage treatment equipment 24.
Specifically, the precipitation may be performed by combining the primary precipitation device 21 and the secondary precipitation device 22, wherein the overflow of the primary precipitation device 21 is transmitted to the secondary precipitation device 22, the underflow of the primary precipitation device 21 is transmitted to the filtering device 23, the overflow of the filtering device 23 is transmitted to the secondary precipitation device 22, the overflow of the secondary precipitation device 22 is used as the output leacheate, and the underflow of the secondary precipitation device 22 is transmitted to the filter pressing device.
In the above embodiment, preferably, the operation of the pumping device is controlled according to a PLC control instruction, so as to realize the diversion and drainage of the suspension between the devices, and meanwhile, the flow sensor is arranged to detect the diversion and drainage flow rate of the pumping device in real time so as to feed back the flow rate to the PLC to control the operation of the pumping device.
Through the synergistic action among pumping equipment, flow sensor and the PLC, the purposes of unattended operation, automatic production, automatic display of instantaneous flow and accumulated flow, uniform discharge and the like can be realized, and meanwhile, the labor intensity of manual operation can be reduced, so that the operation cost of equipment is reduced.
According to the soil leaching treatment process disclosed by the embodiment, the whole leaching treatment process is provided with the selective screening pretreatment system, has a crushing effect on soil, does not have a crushing effect on massive raw stones and building residues, and has the advantages of good contact effect of the polluted soil and water, adjustable leaching synergistic dissolution time according to the concentration of pollutants, adjustable types and concentrations of the agents added by the system, good agent mixing effect, convenient equipment movement, recyclable leacheate and the like; the system can strengthen the synergistic dissolution of heavy metal-organic pollutants and form continuous production; the method has the advantages of low production cost, high safety and wide adaptability to the soil to be repaired; the types and the arrangement modes of equipment combinations in the process can be flexibly adjusted according to the concentration of pollutants and field conditions, and the device has remarkable advantages compared with the existing leaching device and process at home and abroad.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A leaching treatment process for heavy metal-organic contaminated soil is characterized by comprising the following steps:
selectively crushing and screening soil to be restored, discharging large blocks of raw stones and construction residues which are not crushed through an oversize material channel for piling, and conveying small blocks of crushed soil to a buffer bin for temporary storage through an undersize material channel;
conveying the temporarily stored undersize materials to roller stone washing equipment, stirring and mixing the undersize materials with a leaching agent to form particles and suspension, and transferring the particles and the suspension to vibration screening equipment for grading to obtain oversize particles and undersize suspension;
conveying the particles on the sieve to a middle-block spiral sand washing device, further scrubbing the particles by newly added clear water to obtain a cleaned middle-block material, discharging the cleaned middle-block material out of a pile, and conveying the suspension under the sieve to a water medium cyclone for classification;
after classifying the undersize suspension, outputting the underflow of the water medium cyclone to a coarse particle spiral sand washing device, adding clear water for scrubbing, discharging and piling the cleaned coarse particle materials, outputting the overflow of the water medium cyclone to a synergistic dissolution device, adding a medicament configured by a medicament adding device, mixing, and configuring to a preset reaction condition for reaction treatment;
dissolving heavy metal pollutants into a liquid phase by stirring of the synergistic dissolution equipment, adjusting the air intake to generate micro bubbles with different quantities and sizes, and transferring the micro bubbles adsorbing organic pollutants into a foam water flow channel to synchronously remove the heavy metal pollutants and the organic pollutants;
the synergistic dissolution equipment dissolves out the pollutants through reaction, the fine particle materials after the reaction are sequentially output to the precipitation equipment and the filtering equipment for precipitation and filtration to obtain leacheate and filter press filter cakes, and the organic pollutants dissolved out in the reaction process and the heavy metal pollutants transferred to the liquid phase are conveyed to the sewage treatment equipment for treatment.
2. The leaching treatment process for heavy metal-organic contaminated soil according to claim 1, further comprising:
and conveying part of the leacheate obtained by precipitation and filtration to the roller stone washing equipment and the vibration screening equipment for recycling, and conveying part of the leacheate to the sewage treatment equipment for treatment.
3. The leaching treatment process for heavy metal-organic polluted soil according to claim 1, wherein in the process of selectively crushing and screening the soil to be repaired, large soil with low strength is crushed into small soil to enter an undersize material channel, and the undersize material is conveyed to a buffer bin for temporary storage;
the large-block raw stone and the building slag with higher strength have no fragmentations, so that the large-block raw stone and the building slag are discharged from the discharge end through the oversize material channel to be stockpiled.
4. The leaching treatment process for the heavy metal-organic polluted soil according to claim 1, wherein the materials in the buffer bin are uniformly conveyed to a feeding port of the roller stone washing equipment by adjusting the running speed of a material conveying module.
5. The leaching treatment process of heavy metal-organic contaminated soil according to claim 4, wherein the feeding speed of the material conveying module is controlled in a linkage manner through a real-time material level height in the roller stone washing device.
6. The washing treatment process for heavy metal-organic polluted soil as claimed in claim 1, wherein the washing agent or the clean water is sprayed to the screen mesh of the vibration screening device through the spray nozzle, so that the screening mesh is cleaned while the screening efficiency of the material is increased, and the material is prevented from blocking the screening mesh.
7. The heavy metal-organic contaminated soil leaching treatment process according to claim 1, wherein an undersize buffer water tank for temporarily storing undersize suspension is arranged below the supporting platform of the vibration screening device, and the angle of the undersize buffer water tank is set to be 15-63 degrees according to the position of the undersize buffer water tank so as to prevent particles in the suspension from adhering to the side wall or sinking to the bottom.
8. The leaching treatment process of heavy metal-organic contaminated soil according to claim 1, wherein the air intake is adjusted by adjusting the air intake area, different numbers and sizes of micro bubbles are generated based on the negative pressure generated by the centrifugal force of the impeller during the stirring process of the synergistic dissolution device, and due to the selective adsorption of the micro bubbles to the organic contaminants, the micro bubbles adsorbing the organic contaminants are transferred to the foam water flow channel through the bubble scraping mechanism, so as to synchronously remove the heavy metal contaminants and the organic contaminants.
9. The leaching treatment process for heavy metal-organic contaminated soil according to claim 1, wherein the operation of pumping equipment is controlled according to control instructions, so that the transfer and discharge of the suspension between the equipment are realized, and the transfer and discharge flow rate of the pumping equipment is detected so as to control the operation of the pumping equipment in a feedback manner.
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| CN115446099A (en) * | 2022-08-16 | 2022-12-09 | 东华大学 | Method for removing polycyclic aromatic hydrocarbons and heavy metals in soil through microbubble enhanced washing |
| CN116003102A (en) * | 2022-12-02 | 2023-04-25 | 浙江省生态环境科学设计研究院 | Method for preparing sintered brick by using heavy metal contaminated soil |
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