CN113828625A - Leaching treatment device for heavy metal-organic contaminated soil - Google Patents
Leaching treatment device for heavy metal-organic contaminated soil Download PDFInfo
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- CN113828625A CN113828625A CN202111316614.7A CN202111316614A CN113828625A CN 113828625 A CN113828625 A CN 113828625A CN 202111316614 A CN202111316614 A CN 202111316614A CN 113828625 A CN113828625 A CN 113828625A
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- 239000002689 soil Substances 0.000 title claims abstract description 75
- 238000002386 leaching Methods 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 74
- 239000000725 suspension Substances 0.000 claims abstract description 45
- 238000005406 washing Methods 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000004575 stone Substances 0.000 claims abstract description 33
- 238000012216 screening Methods 0.000 claims abstract description 29
- 230000002195 synergetic effect Effects 0.000 claims abstract description 23
- 238000004090 dissolution Methods 0.000 claims abstract description 21
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 19
- 231100000719 pollutant Toxicity 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 239000011362 coarse particle Substances 0.000 claims abstract description 6
- 238000003860 storage Methods 0.000 claims abstract description 5
- 239000012065 filter cake Substances 0.000 claims abstract description 4
- 239000010419 fine particle Substances 0.000 claims abstract description 3
- 238000001556 precipitation Methods 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 18
- 239000010865 sewage Substances 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000002957 persistent organic pollutant Substances 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 15
- 229910001385 heavy metal Inorganic materials 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 238000012806 monitoring device Methods 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 9
- 239000003814 drug Substances 0.000 claims description 7
- 239000007791 liquid phase Substances 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 241001417527 Pempheridae Species 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 11
- 238000005067 remediation Methods 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 9
- 239000002609 medium Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000012634 fragment Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
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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
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a leaching treatment device for heavy metal-organic polluted soil, wherein a soil pretreatment module is used for screening and simultaneously selectively crushing, undersize materials are sent to a buffer bin for temporary storage, sent to a roller stone washing device to be uniformly mixed with leacheate and sent to a vibration screening device 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 device for 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 device for heavy metal-organic polluted soil, which optimizes the structure and combination mode of equipment, selectively crushes the soil by using a soil pretreatment module, crushes large soil with lower strength into small pieces so as to be leached and repaired together with small repairable soil, and realizes the synchronous removal of heavy metal-organic pollution and the continuous and stable repair process by stirring and mixing the soil with leacheate, grading and screening, synergistic dissolution, precipitation, filtration and sewage treatment.
In order to achieve the above object, the present invention provides a leaching treatment device for heavy metal-organic contaminated soil, comprising: the device comprises a soil pretreatment module, a buffer bin, a material conveying module, a roller stone washing device, a vibration screening device, a spiral sand washing device, a water medium cyclone, a synergistic dissolution device, a precipitation device, a filtering device, a sewage treatment device, a medicament adding device and an electric power and control system;
the soil pretreatment module selectively crushes and sieves soil to be repaired, the soil pretreatment module conveys undersize materials to the buffer bin for temporary storage, and the materials temporarily stored in the buffer bin are conveyed to the roller stone washing equipment through the material conveying module in sequence;
the roller stone washing equipment stirs and mixes the material and the leacheate to form particles and stable suspension, and transfers the particles and the stable suspension to the vibration screening equipment, and the vibration screening equipment grades the suspension to obtain particles on a screen and suspension under the screen;
the particles on the sieve are conveyed to a middle block spiral sand washing device and are further scrubbed by newly added clear water to obtain a scrubbed middle block material, the scrubbed middle block material is discharged and stacked, and the undersize suspension is conveyed to the water medium cyclone for classification;
after the water medium swirler grades the undersize suspension, the underflow of the swirler is output to coarse particle spiral sand washing equipment to be scrubbed and then discharged and stockpiled, and the overflow of the swirler is output to the synergistic dissolution equipment;
the synergistic dissolution equipment mixes the overflow of the cyclone and the leaching agent configured by the agent adding equipment, configures the mixture to a proper reaction condition, and then carries out reaction treatment, and outputs the fine particle materials after reaction to the precipitation equipment and the filtering equipment in sequence for precipitation and filtration to obtain leaching solution and a filter cake, 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;
the agent adding device is used for providing corresponding leaching agents and sewage treatment agents for the synergistic dissolution device according to the required concentration and the required dosage, and the electric power and control system provides power utilization and automatic control guarantee for other devices in the device.
In the above technical scheme, preferably, the soil pretreatment module is to there is certain selectivity fragmentation nature when waiting to restore soil to sieve to thereby break into the bold soil that intensity is lower and enter into undersize thing passageway, thereby do not have the fragmentation nature to the bold raw stone that intensity is higher and build the sediment, make bold raw stone and build the sediment and discharge from the discharge end through the thing passageway of oversize and pile up and deposit, the undersize material is carried to buffer bin keeps in temporarily.
In the above technical solution, preferably, the material conveying module includes a variable frequency quantitative feeding belt and a feeding belt machine;
the variable-frequency quantitative feeding belt is arranged below the buffer bin and uniformly conveys materials in the buffer bin to the feeding belt conveyor, and the variable-frequency quantitative feeding belt adjusts the running speed of the belt conveyor through a control signal fed back by the electric power and control system to ensure uniform feeding;
the feeding belt conveyor conveys materials to a feeding port of the roller stone washing equipment, and is provided with corresponding anti-deviation, pull rope switches, a sweeper, a sealing cover and a protective cover structure according to requirements.
In the above technical solution, preferably, a material level height monitoring device is disposed at a material inlet of the roller stone washing equipment, and the material level height monitoring device is connected to the electric power and control system, so as to perform linkage control on the feeding speed of the material conveying module according to the material level height of the material inlet fed back by the material level height monitoring device in real time;
the roller stone washing equipment mixes the materials and the leacheate and then carries out rolling stirring in the equipment, and the materials and the leacheate are uniformly mixed to form particles and stable suspension.
In the above technical solution, preferably, a spray rack is arranged above the screen surface of the vibrating screening device, the spray rack is provided with a preset number of special nozzles, and the nozzles spray leacheate or clear water towards the screen surface for washing;
the screen underflow buffer water tank is arranged below a supporting platform of the vibration screening equipment, the screen underflow suspension after being screened by the vibration screening equipment is temporarily stored in the screen underflow buffer water tank and is conveyed to the water medium cyclone through the auxiliary pumping equipment, and the angle of the screen underflow buffer water tank is set to be 15-63 degrees according to different positions so as to prevent particles in the suspension from being adhered to the side wall or sinking into the bottom.
In above-mentioned technical scheme, preferably, equipment is dissolved out to heavy metal pollutant to the liquid phase through the stirring to the increase, simultaneously, produces the microbubble of different quantity and size through adjusting the intake, adsorbs organic pollutant through the selectivity adsorptivity of bubble to the microbubble that will adsorb organic pollutant shifts to the foam rivers passageway through scraping the bubble mechanism, realizes getting rid of heavy metal pollutant and organic pollutant's synchronization.
In the above technical solution, preferably, part of the leacheate obtained by the precipitation device and the filtration device in sequence is conveyed to the roller stone washing device and the vibration screening device for recycling.
In the above technical solution, preferably, the leaching treatment device for heavy metal-organic contaminated soil further includes a pumping device and a flow sensor, and the pumping device and the flow sensor are respectively connected to the power and control system;
the pumping equipment is arranged between equipment needing suspension liquid transferring and discharging and provides power for the transferring and discharging of the suspension liquid, and the pumping equipment controls the transferring and discharging flow of the suspension liquid according to the command of the electric power and control system;
the flow sensor is arranged at the position of the suspension liquid transfer and discharge and is used for monitoring the transfer and discharge flow of the suspension liquid and sending monitoring data to the power and control system.
Compared with the prior art, the invention has the beneficial effects that: the device structure and the combination mode are optimized, the soil pretreatment module is used for grading and selectively crushing the soil, the polluted soil is stirred and mixed with the leacheate, graded screening, synergistic dissolution, precipitation, filtration and sewage treatment are carried out, synchronous removal of heavy metal-organic pollution is achieved, a continuous and stable repairing process is achieved, the production cost is low, the safety is high, the process is simple, the repairing efficiency is high, and the adaptability to the soil to be repaired is wide.
In addition, through reasonable configuration of the flow sensors and control of the material conveying speed and the suspension liquid transferring and discharging flow through the control system, the pollution repairing accuracy is improved, and meanwhile, the system operation stability is improved.
Drawings
Fig. 1 is a schematic structural diagram of a leaching treatment device 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. the device comprises a soil pretreatment module, 12 a buffer bin, 13 a variable-frequency quantitative feeding belt, 14 a feeding belt conveyor, 15 a roller stone washing device, 16 a vibration screening device, 17 a middle block spiral sand washing device, 18 a water medium cyclone, 19 a synergistic dissolution device, 20 a coarse particle spiral sand washing device, 21 a primary precipitation device, 22 a secondary precipitation device, 23 a filtering device, 24 a sewage treatment device, 25 an undersize buffer water tank, 26 a leacheate buffer water tank and 27 a medicament adding device.
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 device for heavy metal-organic contaminated soil according to the present invention includes: the device comprises a soil pretreatment module 11, a buffer bin 12, a material conveying module, a roller stone washing device 15, a vibration screening device 16, a spiral sand washing device, a water medium cyclone 18, a synergistic dissolution device 19, a precipitation device, a coarse particle spiral sand washing device 20, a primary precipitation device 21, a secondary precipitation device 22, a filtering device 23, a sewage treatment device 24, an undersize buffer water tank 25, a leacheate buffer water tank 26, a medicament adding device 27 and an electric power and control system;
the soil pretreatment module 11 has certain selective fragmentization while sieving soil to be repaired, can crush large soil with lower strength into small soil to enter an undersize material channel, has no fragmentization to large raw stones and construction slag with higher strength, enables the large raw stones and the construction slag to be discharged from a discharge end through an oversize material channel for piling, conveys undersize materials to the buffer bin 12 for temporary storage, and conveys the materials temporarily stored in the buffer bin 12 to the roller stone washing equipment 15 through the material conveying module;
the roller stone washing equipment 15 stirs and mixes the materials and the leacheate to form particles and stable suspension, the particles and the stable suspension are conveyed to the vibration screening equipment 16, and the vibration screening equipment 16 grades the suspension to obtain oversize materials and undersize suspension;
the oversize material is conveyed to a middle block spiral sand washing device 17, fresh water is added for further scrubbing to obtain clean middle block material, the clean middle block material is discharged and stockpiled, and undersize suspension is conveyed to a water medium cyclone 18 for grading;
after the water medium swirler 18 grades the undersize suspension, the underflow of the swirler is output to a coarse particle spiral sand washing device 20, and the overflow of the swirler is output to a synergistic dissolution device 19;
the synergistic dissolution device 19 dissolves the pollutants contained in the polluted soil through reaction, the dissolved organic pollutants and the heavy metal pollutants transferred to the liquid phase are conveyed to the sewage treatment device 24 for treatment, the soil with the pollutants removed after the reaction is sequentially output to the precipitation device and the filtering device 23 for precipitation and filtration, and leacheate and filter pressing filter cakes are obtained;
the agent adding device 27 is used for providing the required concentration and dosage to provide the corresponding leaching agent and sewage treatment agent for the synergistic dissolution device 19, and the power and control system (not shown in the figure) provides power utilization and automatic control guarantee for other devices in the device.
In the embodiment, the device structure and the combination mode are optimized, the soil is selectively crushed by the soil pretreatment module 11, small pieces of polluted soil are leached and repaired, the soil is stirred and mixed with leacheate, classified screening, synergistic dissolution, precipitation, filtration and sewage treatment are carried out, synchronous removal of heavy metal-organic pollution is realized, a 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 adaptability of the soil to be repaired is wide.
The control module in the power and control system is a single chip microcomputer, an embedded controller or a PLC, and preferably the PLC. According to the concentration and the dosing amount required by the system, the medicament adding equipment 27 can automatically provide the functions of preparing, adding and uniformly mixing the required rinsing medicament and the water treatment medicament.
The sedimentation equipment comprises primary sedimentation equipment 21 and secondary sedimentation equipment 22, overflow of the primary sedimentation equipment 21 is conveyed to the secondary sedimentation equipment 22, underflow of the primary sedimentation equipment 21 is conveyed to filtering equipment 23, overflow of the filtering equipment 23 is conveyed to the secondary sedimentation equipment 22, overflow of the secondary sedimentation equipment 22 is used as output leacheate, after the leacheate is buffered by a leacheate buffer water tank 26, part of the leacheate is conveyed to sewage treatment equipment 24 for treatment, part of the leacheate is conveyed to roller stone washing equipment 15 and vibration screening equipment 16 for recycling, and underflow of the secondary sedimentation equipment 22 is conveyed to filter pressing equipment.
Through above-mentioned soil drip washing device, both can be used to the restoration of heavy metal contaminated soil and administer, also can be used to the restoration of organic contaminated soil and administer, still can be used to the restoration of heavy metal + organic combined pollution soil and administer.
Specifically, in the above embodiment, it is preferable that the soil to be restored is fed into the soil pretreatment module 11 by an excavator or a loader to be graded, the soil pretreatment module 11 has a certain selective fragmenting property, and can fragment large soil blocks with low strength into small soil blocks to enter the undersize channel, and the large soil blocks with high strength and building slag have no fragmenting property. Treat the breakage of restoreing soil through soil pretreatment module 11 to filter through the classifying screen, wherein intensity is higher not by the bold original stone of broken and build the sediment for oversize thing, by discharge end discharge pile deposit through oversize thing passageway, the material of fritter is undersize material, carries to buffering feed bin 12 through undersize thing passageway and keeps in.
In the above embodiment, preferably, the material conveying module includes a variable frequency quantitative feeding belt 13 and a feeding belt 14, the variable frequency quantitative feeding belt 13 is disposed below the buffer bin 12, the variable frequency quantitative feeding belt 13 uniformly conveys the material in the buffer bin 12 to the feeding belt 14, and the variable frequency quantitative feeding belt 13 adjusts the operation speed of the belt through a control signal fed back by the PLC to ensure uniform feeding;
the feeding belt conveyor 14 conveys materials to a feeding port of the roller stone washing equipment 15, and is provided with corresponding anti-deviation, pull rope switches, a sweeper, a sealing cover and a protective cover structure according to requirements.
In the above embodiment, preferably, the material level height monitoring device is arranged at the material inlet of the roller stone washing equipment 15, and the material level height monitoring device is connected with the PLC, so as to perform linkage control on the feeding speed of the material conveying module according to the material level height of the material inlet fed back by the material level height monitoring device in real time, thereby effectively avoiding the material inlet of the roller stone washing equipment 15 from being blocked;
the roller stone washing equipment 15 mixes the materials and the leacheate and then stirs the materials in the equipment, and the materials and the leacheate are uniformly mixed to form stable suspension.
In the above embodiment, preferably, the vibrating screening device 16 is provided with a spray rack above the screen surface, the spray rack is provided with a preset number of special nozzles, and the nozzles spray leacheate or clear water to the screen surface for washing, so that the screening efficiency of the material is increased, and meanwhile, the screen holes can be cleaned, so as to prevent the material from blocking the screen holes;
an undersize buffer water tank 25 is arranged below a supporting platform of the vibrating screening device 16, undersize suspension liquid screened by the vibrating screen temporarily stores in the undersize buffer water tank 25 and is conveyed to the aqueous medium cyclone 18 through an auxiliary pumping device, and the angle of the undersize buffer water tank 25 is set to be 15-63 degrees according to different positions so as to prevent particles in the suspension liquid from being adhered to the side wall or sinking to the bottom.
In the above embodiment, preferably, the synergistic dissolution device 19 dissolves heavy metal pollutants into a liquid phase by stirring, and meanwhile, negative pressure is generated due to centrifugal force of the impeller during stirring, so that the air inlet volume can be adjusted by adjusting the air inlet area, and then microbubbles with different numbers and sizes can be generated by adjusting the air inlet volume, organic pollutants are adsorbed by selective adsorption of the bubbles, and the microbubbles adsorbing organic pollutants are transferred to the foam water flow channel by the foam scraping mechanism, thereby realizing synchronous removal of heavy metal pollutants and organic pollutants.
In the above embodiment, preferably, part of the leacheate obtained by the precipitation device and the filtration device 23 is partially conveyed to the roller stone washing device 15 and the vibration screening device 16 for reuse through the leacheate buffer water tank 26, so that the pollutant removal efficiency is improved by increasing the concentration of pollutants entering the rear-end sewage treatment device 24 while the load of the rear-end sewage treatment device 24 is reduced, and the reduction and the efficiency improvement of the rear-end sewage treatment device 24 are facilitated as a whole.
In the above embodiment, preferably, the leaching treatment device for heavy metal-organic contaminated soil further includes a pumping device and a flow sensor, and the pumping device and the flow sensor are respectively connected to the PLC;
the pumping equipment is arranged between equipment needing suspension liquid transferring and discharging, provides power for the suspension liquid transferring and discharging, and controls the transferring and discharging flow of the suspension liquid according to the instruction of the PLC;
the flow sensor is arranged at the transfer and discharge position of the suspension liquid and used for monitoring the transfer and discharge flow of the suspension liquid and sending monitoring data to the PLC. Wherein, according to the kind and the model of the sensor, a corresponding driving module is selected.
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 device disclosed by the embodiment, the whole leaching treatment device and the repairing process have the advantages that the selective screening pretreatment system can crush soil, does not crush massive raw stones and building slag, has a good contact effect on polluted soil and water, the leaching synergistic dissolution time can be adjusted according to the concentration of pollutants, the types and concentrations of the agents added by the system can be adjusted, the agent mixing effect is good, the equipment is convenient to move, the leacheate can be recycled, 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 the equipment combinations 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 (8)
1. The utility model provides a device is dealt with in drip washing of heavy metal-organic contaminated soil which characterized in that includes: the device comprises a soil pretreatment module, a buffer bin, a material conveying module, a roller stone washing device, a vibration screening device, a spiral sand washing device, a water medium cyclone, a synergistic dissolution device, a precipitation device, a filtering device, a sewage treatment device, a medicament adding device and an electric power and control system;
the soil pretreatment module selectively crushes and sieves soil to be repaired, the soil pretreatment module conveys undersize materials to the buffer bin for temporary storage, and the materials temporarily stored in the buffer bin are conveyed to the roller stone washing equipment through the material conveying module in sequence;
the roller stone washing equipment stirs and mixes the material and the leacheate to form particles and stable suspension, and transfers the particles and the stable suspension to the vibration screening equipment, and the vibration screening equipment grades the suspension to obtain particles on a screen and suspension under the screen;
the particles on the sieve are conveyed to a middle block spiral sand washing device and are further scrubbed by newly added clear water to obtain a scrubbed middle block material, the scrubbed middle block material is discharged and stacked, and the undersize suspension is conveyed to the water medium cyclone for classification;
after the water medium swirler grades the undersize suspension, the underflow of the swirler is output to coarse particle spiral sand washing equipment to be scrubbed and then discharged and stockpiled, and the overflow of the swirler is output to the synergistic dissolution equipment;
the synergistic dissolution equipment mixes the overflow of the cyclone and the leaching agent configured by the agent adding equipment, configures the mixture to a proper reaction condition, and then carries out reaction treatment, and outputs the fine particle materials after reaction to the precipitation equipment and the filtering equipment in sequence for precipitation and filtration to obtain leaching solution and a filter cake, 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;
the agent adding device is used for providing corresponding leaching agents and sewage treatment agents for the synergistic dissolution device according to the required concentration and the required dosage, and the electric power and control system provides power utilization and automatic control guarantee for other devices in the device.
2. The heavy metal-organic contaminated soil leaching treatment device according to claim 1, wherein the soil pretreatment module has a certain selective fragmenting property while sieving the soil to be repaired, so as to crush the lower-strength large soil into small soil and enter the undersize channel, and has no fragmenting property for the higher-strength large raw stones and the building residues, so that the large raw stones and the building residues are discharged from the discharge end through the oversize channel to be stacked, and the undersize material is conveyed to the buffer bin for temporary storage.
3. The leaching treatment device for heavy metal-organic contaminated soil according to claim 1, wherein the material conveying module comprises a variable frequency dosing belt and a feeding belt machine;
the variable-frequency quantitative feeding belt is arranged below the buffer bin and uniformly conveys materials in the buffer bin to the feeding belt conveyor, and the variable-frequency quantitative feeding belt adjusts the running speed of the belt conveyor through a control signal fed back by the electric power and control system to ensure uniform feeding;
the feeding belt conveyor conveys materials to a feeding port of the roller stone washing equipment, and is provided with corresponding anti-deviation, pull rope switches, a sweeper, a sealing cover and a protective cover structure according to requirements.
4. The leaching treatment device for heavy metal-organic polluted soil according to claim 3, wherein a material level height monitoring device is arranged at a material inlet of the roller stone washing equipment, and the material level height monitoring device is connected with the electric power and control system so as to perform linkage control on the feeding speed of the material conveying module according to the material level height of the material inlet fed back by the material level height monitoring device in real time;
the roller stone washing equipment mixes the materials and the leacheate and then carries out rolling stirring in the equipment, and the materials and the leacheate are uniformly mixed to form particles and stable suspension.
5. The leaching treatment device for heavy metal-organic polluted soil according to claim 1, wherein the vibrating screening equipment is provided with a spray frame above the screen surface, the spray frame is provided with a preset number of special nozzles, and the nozzles spray leacheate or clear water towards the screen surface for washing;
the screen underflow buffer water tank is arranged below a supporting platform of the vibration screening equipment, the screen underflow suspension after being screened by the vibration screening equipment is temporarily stored in the screen underflow buffer water tank and is conveyed to the water medium cyclone through the auxiliary pumping equipment, and the angle of the screen underflow buffer water tank is set to be 15-63 degrees according to different positions so as to prevent particles in the suspension from being adhered to the side wall or sinking into the bottom.
6. The leaching treatment device for heavy metal-organic contaminated soil according to claim 1, wherein the synergistic leaching apparatus leaches heavy metal pollutants into liquid phase by stirring, meanwhile, generates micro bubbles with different numbers and sizes by adjusting the air intake, adsorbs organic pollutants by selective adsorption of the bubbles, and transfers the micro bubbles adsorbing organic pollutants into the foam water flow channel by the foam scraping mechanism, thereby realizing the synchronous removal of the heavy metal pollutants and the organic pollutants.
7. The leaching treatment device for heavy metal-organic polluted soil according to claim 1, wherein a part of leaching solution obtained by the precipitation equipment and the filtration equipment in sequence is conveyed to the roller stone washing equipment and the vibration screening equipment for recycling.
8. The leaching treatment device for heavy metal-organic contaminated soil according to claim 1, further comprising a pumping device and a flow sensor, wherein the pumping device and the flow sensor are respectively connected to the power and control system;
the pumping equipment is arranged between equipment needing suspension liquid transferring and discharging and provides power for the transferring and discharging of the suspension liquid, and the pumping equipment controls the transferring and discharging flow of the suspension liquid according to the command of the electric power and control system;
the flow sensor is arranged at the position of the suspension liquid transfer and discharge and is used for monitoring the transfer and discharge flow of the suspension liquid and sending monitoring data to the power and control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111316614.7A CN113828625A (en) | 2021-11-08 | 2021-11-08 | Leaching treatment device for heavy metal-organic contaminated soil |
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| CN202111316614.7A CN113828625A (en) | 2021-11-08 | 2021-11-08 | Leaching treatment device for heavy metal-organic contaminated soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20211224 |