CN106881341A - A kind of heavy-metal contaminated soil leaching repairing method - Google Patents
A kind of heavy-metal contaminated soil leaching repairing method Download PDFInfo
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- CN106881341A CN106881341A CN201710176831.8A CN201710176831A CN106881341A CN 106881341 A CN106881341 A CN 106881341A CN 201710176831 A CN201710176831 A CN 201710176831A CN 106881341 A CN106881341 A CN 106881341A
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- muddy water
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/025—High gradient magnetic separators
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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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The present invention relates to a kind of Soil leaching restorative procedure, belong to heavy metal pollution of soil and administer field, and in particular to a kind of heavy-metal contaminated soil leaching repairing method.From soil be transferred in leacheate heavy metal by eluent by the present invention, recycles magnetic medium as sorbing material, each metal ion species in quick adsorption leacheate, making it difficult to which the heavy-metal contaminated soil of reparation is recovered rapidly.Magnetic medium is adsorbed in three-dimensional paramagnetic metal link network in the presence of high-intensity magnetic field, and magnetizing mediums is taken out of and reclaimed by the machine driving of metal link network, improves the utilization rate of magnetic kind, reduces rehabilitation cost.
Description
Technical field
The present invention relates to a kind of Soil leaching restorative procedure, belong to heavy metal pollution of soil and administer field, and in particular to one
Heavy metal species contaminated soil leaching repairing method.
Background technology
Soil pollution is because material or the plant nutrient of excess with physiological-toxicity cause soil into soil
Earth property deterioration and the phenomenon of physiological function of plants imbalance.With China's rapid development of economy, extensive economic growth mould
Formula causes soil pollution situation severe exacerbation.According to national Soil Pollution Investigation publication in 2014, the state of China 16.1%
Native area is contaminated, and 19.4% arable land is contaminated, and about 1/3rd industrial sites investigated are contaminated.Soil is dirty
Based on heavy metal pollution, Organic Pollution takes second place dye type, and compound pollution proportion is smaller.Cause the heavy metal of soil pollution
Mainly include cadmium, mercury, arsenic, copper, lead, chromium, zinc and nickel, investigation publication show these heavy metal points position exceeding standard rate be respectively 7.0%,
1.6%th, 2.7%, 2.1%, 1.5%, 1.1%, 0.9%, 4.8%, due to heavy metal in soil have disguise, cumulative bad,
Hysteresis quality and toxicity are relatively strong and the characteristics of easily by bio-absorbable, therefore very urgent for heavy metal pollution of soil repair.
The reparation of heavy-metal contaminated soil mainly has three kinds of methods.The first is that contaminated soil is carried out at security landfill
Put, this mode floor space is larger.Second is to carry out solidification and stabilization to contaminated soil, changes the heavy metal of activated state
It is stable state, reduces its animal migration, bioavailability in soil.This approach can reduce the poison of heavy metal in soil
Evil, but with the change of envirment factor, the stabilized process of heavy metals immobilization is possible to inversely carry out, and causes to repair not thorough.
The third is to remove the heavy metal in soil.Phytoremediation can realize the removing of heavy metal, and the country grinds to phytoremediation technology
Study carefully also more, but for the soil of some high concentration heavy metal pollutions, concentration and poison if do not carried out pre-treatment reduction heavy metal
Property, phytoremediation is typically infeasible.And elution technique can efficiently, without quadratic risk function, thoroughly removal contaminated soil in
Heavy metal, both can individually repair the heavy-metal contaminated soil of small area, also can be used as pretreatment technology and other restorative procedures
Use in conjunction, is increasingly widely applied.
Soil leaching technology is divided into drip washing in situ and dystopy drip washing according to processing mode difference.Elution method in situ is directly will
In eluent injection soil, leacheate is extracted into soil surface in downstream, then leacheate is processed, so persistently entered
OK, until soil environment quality reaches relevant criterion.Dystopy drip washing is to excavate contaminated soil, in input drip washing equipment, is adopted
Pollutant in cleaning removal or transfer concentration soil with leacheate is dense after leacheate or decrement of the finally treatment containing pollutant
Contracting mud cake.It is organic that the technology can be used for the persistence such as heavy-metal contaminated soil and polycyclic aromatic hydrocarbon, Polychlorinated biphenyls, organo-chlorine pesticide
The repairing and treating of contaminated soil.
Although soil washing has the advantages that long-lasting, ease for operation and high osmosis, there is also 2 and mainly lack
Point：One is that elution method needs to consume substantial amounts of water to prepare leacheate；Two is that a large amount of leachates need treatment.It is rich in leachates
, if do not dealt carefully with, can there is pollution risk to underground water in heavy metal and the complex compound of eluent.
The content of the invention
Present invention is primarily intended to solve heavy metal pollution treatment effeciency present in existing Soil leaching technology it is low and
A kind of technical problem of high cost, there is provided heavy-metal contaminated soil leaching repairing method.The present invention will a huge sum of money by eluent
Category is transferred in leacheate from soil, recycles magnetic medium as sorbing material, the various gold in quick adsorption leacheate
Category ion, making it difficult to which the heavy-metal contaminated soil of reparation is recovered rapidly.Magnetic medium is inhaled in the presence of high-intensity magnetic field
It is attached in three-dimensional paramagnetic metal link network, magnetizing mediums is taken out of and reclaimed by the machine driving of metal link network, improves the profit of magnetic kind
With rate, rehabilitation cost is reduced.
Above-mentioned purpose of the invention is mainly and is addressed by following technical proposals：
A kind of heavy-metal contaminated soil leaching repairing method, including
Soil breaking step, crushes to contaminated soil and its impurity, and the soil after crushing is delivered to by belt feeder
Cylinder roto-siofter；
Argillaceous sand stone separating step, the soil after being processed through disintegrating machine is sieved in tilted-putted cylinder roto-siofter,
Filter out sand and by the collecting tank in mud-water conveying to heavy metal Magneto separate unit；
Superconducting magnetic separating step, will add magnetic medium and mixes in sewage, the muddy water that will be mixed with magnetic medium passes through
Sewage pump is delivered in superconduction magnetic separator, interior in superconduction magnetic separator under the high-gradient intense magnetic field effect that superconductor is produced
The magnetic medium that the rotatable metal link network put will be adsorbed with heavy metal takes liquid level out of；
Sludge dewatering step, the heavy metal muddy water up to standard excluded from superconducting magnetic separative element enters into enter in soil sedimentation basin
Row precipitate and separate.
Optimization, a kind of above-mentioned heavy-metal contaminated soil leaching repairing method, in argillaceous sand stone separating step,
Coarse fodder by particle diameter more than 10mm delivers to roller-type stone washing machine rotation scouring and obtains clean stone, will clean the mud for producing
The tiny sand isolated in muddy water in dewatering screen is delivered to again after water feeding roller-type stone washing machine water leg；
Optimization, a kind of above-mentioned heavy-metal contaminated soil leaching repairing method, in silt particle separating step,
Fines by particle diameter less than 10mm is delivered to during muddy water mixes pond and is sufficiently mixed with water and will dissociated in soil
The heavy metal of state is transferred in water from soil, and mixing muddy water is delivered into hydrocyclone isolates sand and muddy water, by sand
Son is exited into after carrying out girt-water separation in dewatering screen through hydrocyclone bottom and obtains clean sand, by hydrocyclone top
Muddy water in portion's muddy water and dewatering screen water leg out is together transported in the collecting tank in heavy metal Magneto separate unit.
Optimization, a kind of above-mentioned heavy-metal contaminated soil leaching repairing method, in superconduction separating step,
Then magnetic medium is blown out on the net from metallic bond using sky mouth of blowing the trumpet, and enters into cyclone separator and carry out
Solid and gas is separated, and the magnetic medium for obtaining is recycled in rejoining blending tank；Non magnetic bulky grain thing in leachates
Superconduction magnetic separator bottom is deposited to, and periodically sediment is delivered in soil sedimentation basin, a huge sum of money in muddy water after treatment
During category concentration over-standard, muddy water is back in collecting tank again, otherwise flows into the soil sedimentation basin in sludge dewatering unit.
Optimization, a kind of above-mentioned heavy-metal contaminated soil leaching repairing method, in sludge dewatering step,
Supernatant is entered into slurry pond in soil sedimentation basin, and sludge is delivered in sludge concentration tank through sludge pump,
Being delivered to sludge dewatering equipment through pump by the sludge after sludge concentration tank carries out mud-water separation, and clean mud is obtained after sludge press filtration
Soil, the water of generation is collected into slurry pond.
Optimization, a kind of above-mentioned heavy-metal contaminated soil leaching repairing method is also processed including recycle-water in-depth, will be taken
With not oxidized Fe2+Waste water is entered into Fenton reactive tanks, is subsequently adding H2O2, make H2O2The Fe generated with light electrolysis2+
Fenton reagent is constituted, the water after treatment is entered into coagulative precipitation tank and the precipitation that flocculation aid accelerates iron floccule body is quantitatively adding
Separate, supernatant is delivered in recycle-water storage pool, and base sludge is delivered to sludge dewatering equipment and carries out press filtration in sedimentation basin, obtains
Mud cake, the water of generation is entered into recycle-water storage pool, and the water in recycle-water storage pool through pump, stir respectively by reuse to muddy water mixing
Mix pond and roller-type stone washing machine.
Therefore, the invention has the advantages that：
(1) heavy metal is transferred in leacheate from soil by eluent, recycles magnetic medium as adsorption material
Material, each metal ion species in quick adsorption leacheate, making it difficult to which the heavy-metal contaminated soil of reparation is recovered rapidly.
(2) magnetic medium is adsorbed in three-dimensional paramagnetic metal link network in the presence of high-intensity magnetic field, by metal link network
Magnetizing mediums is taken out of and reclaimed by machine driving, improves the utilization rate of magnetic kind, reduces rehabilitation cost.
Brief description of the drawings
Fig. 1 is heavy-metal contaminated soil drip washing repair system schematic diagram；
Fig. 2 is the flow chart of heavy-metal contaminated soil drip washing repair system；
Fig. 3 is that magnetic kind adds influence of the batch to lead adsorption and lead accumulative removal amount；
Fig. 4 is that magnetic kind adds influence of the batch to arsenic adsorbance and arsenic accumulative removal amount；
In figure：1- heavy-metal contaminated soils, 2- soil storage feed bin, 3- soil crushers, the belt feeders of 4.1- first, 4.2-
Second belt feeder, the belt feeders of 4.3- the 3rd, 4.4 the 4th belt feeders, 4.5 the 5th belt feeders, 5- cylinder roto-siofters, 6- rollers wash stone
Machine, 7- cleaning stones stack field, and 8- muddy water mixes pond, and 9- hydrocyclones, 10- dewatering screens, 11- cleaning sands are stacked
, 12- collecting tanks, 13- blending tanks, 14- magnetizing mediums injectors, 15- superconductions magnetic separator, 15.1- superconductors, 15.2- magnetic point
From tank body, 15.3- metal link networks, 16- system control cabinets, 17- refrigeration machines, 18- magnetizing mediums extraction mechanism, 18.1- one cyclonics
Separator, 18.2- secondary cyclones, 19- soil sedimentation basins, 20- soil dehydration machines, 21- cleaning soil, 22- washings are used
Pond, the online water quality testing meters of 23-, 24- regulating reservoirs, 25- acid storage tanks, 26- iron-carbon micro-electrolysis retort, 27- air compressor machines, 28-
Fenton reactive tanks, 29- dioxygen water storage tanks, 30- flocculation aid storage tanks, 31- coagulative precipitation tanks, 32- sludge dewatering equipments, 33- mud cakes,
34- recycle-water storage pools；Muddy water pump P1, muddy water pump P2, muddy water pump P3, muddy water pump P4, muddy water pump P6, vavuum pump P5, sludge pump
P7, sludge pump P11, clarified water pump P8, clarified water pump P9, clarified water pump P10, clarified water pump P12；Magnetic valve F1, magnetic valve F2, magnetic valve
F3, magnetic valve F4.
Specific embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
Fig. 1 is the heavy-metal contaminated soil drip washing repair process technique of the present embodiment, including the soil breaking being sequentially connected
System, soil argillaceous sand stone piece-rate system, superconduction magnetic separation system, sludge dewatering system and recycle-water in-depth processing system.
Fig. 2 is an a kind of optional specific implementation system equipment flow of heavy-metal contaminated soil drip washing repair system
Figure.
Wherein, soil breaking system is sequentially connected with group by soil storage feed bin 2, the belt feeder 4.1 of soil crusher 3 and first
Into.
The soil argillaceous sand stone piece-rate system includes：Cylinder roto-siofter 5, roller-type stone washing machine 6, muddy water mix pond 8, water
The mixing of power cyclone 9, dewatering screen 10, the second belt feeder 4.2, the 3rd belt feeder 4.3 and the 4th belt feeder 4.4, wherein muddy water is stirred
Mix pond 8 and the entrance point of roller-type stone washing machine 6 to be connected with the fines of cylinder roto-siofter 5 and the coarse fodder port of export respectively, roller-type stone washing machine 6 is exported
End be connected with the 4th belt feeder 4.4, muddy water mixing pond 8, the heavy burder port of export of hydrocyclone 9, the charging aperture of dewatering screen 10 and
5th belt feeder 4.5 is sequentially connected, and gently the material port of export is connected to superconducting magnetic point to the port of export of dewatering screen 10 in the lump with hydrocyclone 9
The entrance point of collecting tank 12 in system, the coarse fodder port of export of roller-type stone washing machine 6 is connected with the charging aperture of dewatering screen 10.
The superconduction magnetic separation system includes collecting tank 12, blending tank 13, magnetizing mediums injector 14, superconduction magnetic separator
15th, system control cabinet 16, refrigeration machine 17 and magnetizing mediums extraction mechanism 18, wherein collecting tank 12, blending tank 13, superconduction magnetic separator
15 and magnetizing mediums extraction mechanism 18 be sequentially connected, the superconduction magnetic separator 15 respectively with system control cabinet 16 and the phase of refrigeration machine 17
Even, the entrance point of collecting tank 12 is connected with the light substance port of export of hydrocyclone 9 and the water side of dewatering screen 10 respectively；The blending tank
13 are provided with agitator arm and motor, and the top of the blending tank 13 is provided with magnetizing mediums extraction mechanism and magnetizing mediums dispensing port, institute
Magnetizing mediums dispensing port is stated to be connected with magnetizing mediums injector 14.
The superconduction magnetic separator 15 includes superconductor 15.1, Magneto separate tank body 15.2 and metal link network 15.3, described super
Conductor 15.1 can be with dismounting and change, and the superconductor 15.1 includes high-temperature superconductor and cryogenic superconductor, the Magneto separate tank body
15.2 include inlet, overfall, mud discharging mouth and two pressure-vaccum horn mouths, and the inlet is connected with the discharge outlet of blending tank 13,
The overfall is connected with the water inlet end of soil sedimentation basin 19 in collecting tank 12 and sludge dewatering system respectively, the mud discharging mouth with it is dirty
The water inlet end of soil sedimentation basin 19 is connected in mud dewatering system, and the magnetizing mediums extraction mechanism 18 includes primary cyclone 18.1
With secondary cyclone 18.2, described two pressure-vaccum horn mouths one are malleation, and one is negative pressure, and the one cyclonic is separated
The inlet port of device 18.1 is connected with negative pressure horn mouth, outlet port and the air inlet of secondary cyclone 18.2, vavuum pump P5 and
Malleation horn mouth is sequentially connected.
The sludge dewatering system includes the soil sedimentation basin 19, soil dehydration machine 20 and the slurry pond that are sequentially connected
22, the wherein entrance point of soil sedimentation basin 19 is connected with the overfall of Magneto separate tank body 15.2 and mud discharging mouth respectively, soil sedimentation basin 19
Water side and spoil disposal end are connected with slurry pond 22 and the entrance point of sludge concentration tank 19 respectively, the port of export of slurry pond 22 point
Pond 8 is not mixed with muddy water and the entrance point of roller-type stone washing machine 6 is connected；It is provided with the delivery port pipeline of the slurry pond 22
Online water quality testing meter 23.
The recycle-water in-depth processing system includes regulating reservoir 24, acid storage tank 25, iron-carbon micro-electrolysis retort 26, air compressor machine
27th, Fenton reactive tanks 28, dioxygen water storage tank 29, flocculation aid storage tank 30, coagulative precipitation tank 31, sludge dewatering equipment 32 and recycle-water
Storage pool 34, wherein, the front end of regulating reservoir 24 is connected with slurry pond 22 and acid storage tank 25 respectively, and its end is sequentially connected iron carbon
Micro-electrolysis reaction tank 26, Fenton reactive tanks 28, coagulative precipitation tank 31, sludge dewatering equipment 32 and recycle-water storage pool 34；Wherein
Fenton reactive tanks 28 and the entrance point of coagulative precipitation tank 31 are connected with dioxygen water store tank 29 and flocculation aid storage tank 30 respectively；Reuse
The port of export of water storage pool 34 mixes pond 8 with muddy water respectively and roller-type stone washing machine 6 is connected, the supernatant water outlet of coagulative precipitation tank 31
End is connected with the entrance point of recycle-water storage pool 34；Wherein described acid storage tank 25 is at least in storage industry sulfuric acid or hydrochloric acid
Kind, the flocculation aid storage tank 30 is used to store polyacrylamide solution.
The soil storage feed bin 2 is used for the temporary and system feeding of heavy-metal contaminated soil, and feed bin side wall is equipped with
Broken arch motor and plate vibrator, prevent blanking from blocking；The pulverizer 3 is used for the broken of contaminated soil and its impurity；It is described
Belt feeder 4.1 is used to be delivered to the soil after crushing in cylinder roto-siofter.
The soil that the cylinder roto-siofter 5 is used for after sieving approach, isolates containing the coarse fodder more than 10mm and is less than
The fines of 10mm, the cylinder roto-siofter 5 is made up of mechanisms such as motor, reductor, drum apparatus, frames, wherein drum apparatus
It is in tilted layout, motor links together through reductor with cylinder mechanism, drives cylinder mechanism rotatable around its axis, described time
Turn sieve drum apparatus by body seal cap sealing, so as to ensure that equipment in the course of the work, effectively prevents dust pollution；Through circle
The cylinder coarse fodder isolated of roto-siofter 5 is delivered to roller-type stone washing machine 6 by the 3rd belt feeder 4.3, and the clean stone isolated is through the
Four belt feeders 4.4 are delivered to clean stone and stack field 7, and the mud obtained after separation is collected through the underdrain groove of roller-type stone washing machine 6
After enter into dewatering screen 10, the roller-type stone washing machine 6 be used for cylinder roto-siofter 5 screen out come coarse fodder drip washing, by thick
The material friction mutual with equipment inner wall and coarse fodder with current, coarse fodder is separated realizing that coarse fodder is fine grain with its surface；Particle diameter
Fines less than 10mm is delivered in muddy water mixing pond 8 through the second belt feeder 4.2, and the muddy water mixes pond 8 to be used for
Water and fines are mixed with mud mixture, and heavy metal is separated in water from soil by stirring mixing；The waterpower rotation
Stream device 9 is used to separate the larger fine particle of proportion in muddy water；The dewatering screen 10 is used to separate by hydrocyclone treatment
Moisture in the thin particulate matter for obtaining afterwards.
The collecting tank 12 is used to collect the light substance that the water outlet of dewatering screen 10 and cyclone separator 9 give off；The mixing
Tank 13 is used for the quantitative water of collecting tank and mixes with magnetizing mediums, and the magnetizing mediums comes from magnetizing mediums extraction mechanism 18 and magnetizing mediums sample introduction
Device 14；The magnetizing mediums injector 14 is used for quantitative to supplementing magnetic medium in blending tank；The superconduction magnetic separator 15 is wrapped
Superconductor 15.1, Magneto separate tank body 15.2 and metal link network 15.3 are included, the superconductor 15.1 is used for superconduction magnetic separator 15
Inside provides predetermined high-gradient magnetic field；The Magneto separate tank body 15.2 is used to collect the muddy water that storage is mixed with magnetic medium；Institute
State the magnetisable material in adsorbing water after metal link network 15.3 is magnetized in high-gradient magnetic field；The magnetizing mediums extraction mechanism 18
The magnetic medium of heavy metal is adsorbed with metal link network 15.3 for separating and collecting；The primary cyclone 18.1 and two grades
Cyclone separator 18.2 is used to separate the magnetic medium in gas, and the magnetic medium that will be isolated is back to use blending tank 13 again
In.
The soil sedimentation basin 19 is used to precipitate the muddy water and magnetic of qualified discharge after the treatment of superconduction magnetic separation system and is situated between
The bed mud of matter extraction mechanism discharge；The soil dehydration machine 20 is used for the concentration and dehydration of sludge slurry；The slurry pond 22
Supernatant and the pressure filtration yielding water of soil dehydration machine 20 for collecting the discharge of mudpan 19, and for muddy water mixes pond 8
With the offer water of roller-type stone washing machine 6；The online water quality testing meter 23 of water quality is used to monitor water quality condition in slurry groove, institute
Stating water quality condition includes COD (COD), ammonia nitrogen, pH and dissolved oxygen.
The regulating reservoir 24 is used for the pH value of the waste water not up to standard for adjusting the discharge of slurry pond 22；The acid storage tank 25 is used
Stored in acid solution and according to water quality in regulating reservoir and water volume condition, quantitative addition acid solution carries out pH regulations；The micro- electricity of iron carbon
Solution retort 26 is used to process the acid waste water discharged in regulating reservoir 24, using the difference in Electrode Potential that there is 1.2V between Fe and C,
Countless micro cell systems are formed, a large amount of Fe produced on anode2+By Quick Oxidation into Fe3+, being formed has absorption wadding higher
Coagulate the flocculant of activity；Cathode reaction produces the hydroxyl of a large amount of nascent states, under conditions of slant acidity, the equal energy of these active components
There is redox reaction with many components in waste water, make organic macromolecule that chain-scission degradation to occur；The air compressor machine 27 is used for
To air is passed through in iron-carbon micro-electrolysis retort 26, accelerate Fe2+Oxidation rate；The Fenton reactive tanks 28 are using addition
H2O2The Fe generated with light electrolysis2+React the hydroxyl radical free radical attack organic molecule with strong oxidizing property for producing, further ore deposit
Change the organic matter not removed by light electrolysis in decomposition water；The dioxygen water storage tank 29 is used for H2O2Store and quantitative to Fenton
H is added in reactive tank 282O2；The flocculation aid storage tank 30 is stored for polyacrylamide solution, and according to the water of coagulative precipitation tank 31
Matter and the quantitative addition polyacrylamide solution of water volume condition；The coagulative precipitation tank 31 is by sewage and flocculation aid polyacrylamide
Amine aqueous solution mixes, and enables the particle for being difficult to precipitate in water to be aggregated with one another to form colloid, and then precipitate and separate；The sludge dewatering equipment
32 are used to carry out mud-water separation to the sludge of the bottom of coagulative precipitation tank 31 discharge；The recycle-water storage pool 34 is used for coagulating sedimentation
The collection storage of the supernatant of pond 31 and the pressure filtration yielding water of sludge dewatering equipment 32, and carried for roller-type stone washing machine 6 and muddy water mix pond 8
For water.
After said structure, the present embodiment is additionally provided and a kind of carries out heavy-metal contaminated soil pouring using above-mentioned system
The method for washing reparation, concretely comprises the following steps：
(1) soil breaking
Heavy-metal contaminated soil 1 is stored in soil storage feed bin 2, by the soil crusher 3 for being arranged on bin bottom
Bulk soil is crushed, the soil particle after crushing is delivered in cylinder roto-siofter 5 through the first belt feeder 4.1 and is sieved
Point.
(2) soil argillaceous sand stone is separated
Soil after broken enters into cylinder roto-siofter 5 and is sieved, and thick material is from the lower end discharging opening of cylinder roto-siofter 5
Screen out and, thin material 5 upper end outlets from cylinder roto-siofter are separated, screen out the thick material for coming through the 3rd belt feeder
4.3 are delivered in roller-type stone washing machine 6 and are rinsed, and obtain clean stone, and being delivered to clean stone through the 4th belt feeder 4.4 stacks
Field 7, the muddy water of generation enters back into dewatering screen 10 and enters one after being collected through the muddy water collecting pit that the bottom of roller-type stone washing machine 6 is set
Step isolates small particle；Cylinder roto-siofter 5 screens out the fines for coming and is delivered to muddy water mixing pond through the second belt feeder 4.2
In 8, thin material is thoroughly mixed to form mud mixture solution, the muddy water of generation with detergent water in muddy water mixes pond 8
It is delivered in hydrocyclone 9 through muddy water pump P1, the light component in muddy water is entered into the collecting tank 12 of superconduction magnetic separation system,
The outlet at bottom of the restructuring lease making such as sand in muddy water hydrocyclone 9 exits into dewatering screen 10 carries out girt-water separation, remains
Fine particle on the top of dewatering screen 10 is delivered to clean sand and stacks field 11 through the 5th belt feeder 4.5.
(3) superconduction Magneto separate
Muddy water and dewatering screen 10 at the top of in hydrocyclone 9 out convey the muddy water for coming in collecting tank through muddy water pump P2
Mix in 12；Mixing muddy water is quantitatively transferred in blending tank 13 through muddy water pump P3, according to the water of blending tank 13 and water quality condition, is led to
The quantitative addition magnetic medium of magnetizing mediums injector 14 is crossed, then by the built-in stirring system in blending tank 13, by magnetic
Medium is sufficiently mixed with muddy water；It is mixed with the muddy water of magnetizing mediums to be delivered in superconduction magnetic separator 15 through muddy water pump P4, in superconduction
Under the High-gradient Magnetic field action that body 15.1 is provided, the metal link network 15.3 inside Magneto separate tank body 15.2 is adsorbed in water after being magnetized
Magnetisable material, with the rotation of metal link network 15.3, the magnetic medium for being adsorbed with heavy metal is carried over liquid level, then by magnetic
Medium extraction mechanism 18 is recycled；Under vavuum pump P5 effects, by two be arranged on Magneto separate tank body 15.2
Pressure-vaccum horn mouth separates magnetizing mediums from metal link network 15.3, then sequentially enters primary cyclone 18.1 and two grades
Magnetic kind recovery is carried out in cyclone separator 18.2, the magnetic kind that will be recovered to is recycled in being added to blending tank 13 again；
Muddy water after the treatment of superconduction magnetic separator 15, if heavy metal concentration detection is exceeded, magnetic valve F1 is opened and magnetic valve F2
Close, muddy water is back in collecting tank 12 through muddy water pump P6 and is reprocessed；Otherwise magnetic valve F1 is opened and magnetic valve F2 is closed,
Muddy water is delivered in soil sedimentation basin 19 through muddy water pump P6.
(4) sludge dewatering
By bottom row in the heavy metal concentration permitted discharge after the treatment of superconduction magnetic separator 15 and superconduction magnetic separator 15
The sludge put together enters into and mud-water separation is carried out in soil sedimentation basin 19, and the supernatant of soil sedimentation basin 19 enters into slurry
In pond 22, base sludge is delivered to soil dehydration machine 20 and carries out mud-water separation by sludge pump P7, and cleaning is obtained after press filtration
Soil 21, press filtration water is delivered in slurry pond 22, when the water collected in slurry pond 22 is through online water quality testing meter 23
When detecting up to standard, magnetic valve F3 is opened and F4 is closed, and clarified water pump P12 is closed, and the water outlet of slurry pond 22 flows back through clarified water pump P8
In pond 8 and roller-type stone washing machine 6 being mixed to muddy water；Otherwise magnetic valve F3 is closed and F4 is opened, the water outlet of slurry pond 22 warp
Clarified water pump P8 is delivered to regulating reservoir 24, and clarified water pump P12 is opened, and the water outlet of recycle-water storage pool 34 is delivered to mixing through clarified water pump P12
In stirring pool 8 and roller-type stone washing machine 6.
(5) recycle-water in-depth treatment
Free state heavy metal is removed by major part after the treatment of superconduction magnetic separator 15 in soil, due to possible in soil
The solubilised state poisonous and harmful hardly degraded organic substance of presence, these organic matters are individually difficult to removal and separate by superconduction Magneto separate, therefore
These organic matters can be caused to accumulate during the recycling of slurry, when organic concentration is exceeded in slurry pond 22
When, the water outlet of slurry pond 22 is delivered to regulating reservoir 24 through clarified water pump P8, according to water water and water quality situation, is stored up by acid solution
The quantitative addition acid solution of tank 24,3-4 is adjusted to by solution ph, and acid waste water is delivered to iron-carbon micro-electrolysis through clarified water pump P9 from bottom
In retort 26, and air is blasted by air compressor machine 27 inwards, due to the difference in Electrode Potential that there is 1.2V between Fe and C, thus
Countless micro cell systems can be formed, iron is anode, and cementite is negative electrode, and electrode reaction is：Anode Fe-2e → Fe2+, Fe2+/
Fe=-0.44V；Negative electrode 2H++ 2e → 2 [H], H+/H2=-0.00V, under oxygen in water effect, what is produced on anode is a large amount of
Fe2+By Quick Oxidation into Fe3+, form the flocculant with adsorption-flocculation higher activity；Cathode reaction produces a large amount of nascent states
Hydroxyl, under conditions of slant acidity, these active components can occur redox reaction with many components in waste water, make to have
There is chain-scission degradation in machine macromolecular；Carry not oxidized Fe2+Waste water is entered into Fenton reactive tanks 28, then by double
Oxygen water storage tank 29 is quantitatively adding H2O2, make H2O2The Fe generated with light electrolysis2+Constitute Fenton reagent, reaction produce with strong
The hydroxyl radical free radical attack organic molecule of oxidisability, further mineralising decomposing organic matter, and reach the purpose of organics removal；Place
Water after reason is delivered to coagulative precipitation tank 31 through clarified water pump P10, and being quantitatively adding flocculation aid by flocculation aid storage tank 30 accelerates iron wadding
The precipitate and separate of solidifying body, the supernatant of coagulative precipitation tank 31 is delivered in recycle-water storage pool 34, the base sludge of coagulative precipitation tank 31
Being delivered to sludge dewatering equipment 32 through sludge pump P11 carries out press filtration, obtains mud cake 33, and press filtration water enters into recycle-water storage pool 34
In, when 22 overproof water quality of slurry pond, the water in recycle-water storage pool 34 is delivered to muddy water and mixes through clarified water pump P12
In pond 8 and roller-type stone washing machine 6.
For a kind of heavy-metal contaminated soil drip washing repair system of the invention and method, by following case history to upper
State implementation result and be analyzed checking, be specifically described as follows：
Embodiment 1：
Hunan mine pollution site remediation project, the place soil major pollutants are needed based on heavy metal lead and arsenic
It is 41000m to want rehabilitating soil earth volume3, repaired using heavy-metal contaminated soil drip washing repair system of the invention, soil
In the case of drip washing device systems normal duty, average treatment amount is 150m3/ h, system carrying out practically process is as shown in Figure 2.
Crushed by soil crusher 3 from the soil storage contaminated soil out of feed bin 2, the soil particle after crushing is through the
One belt feeder 4.1 is sieved in being delivered to cylinder roto-siofter 5.
Particle diameter through being screened out in cylinder roto-siofter 5 is delivered to roller and washes stone more than 10mm materials through the 3rd belt feeder 4.3
Machine 6 is rinsed, and the coarse fodder for obtaining is delivered to clean stone and stacks field 7 through the 4th belt feeder 4.4, and the muddy water of generation is after collection
Dewatering screen 10 is delivered to be sieved；The particle diameter screened out in cylinder roto-siofter 5 is defeated through the second belt feeder 4.2 less than 10mm materials
Deliver to muddy water and mix pond 8, by the mixing that adds water, the muddy water of generation is delivered to hydrocyclone 9 through muddy water pump P1, obtains
To heavy material be flowed into dewatering screen 10 from the bottom of hydrocyclone 9 and carry out coarseparticulate separation, from the top of hydrocyclone 9
The light material of outflow and the water outlet of dewatering screen 10 enter into collecting tank 12 in the lump.
Sewage is quantitatively transferred in blending tank 13 through muddy water pump P3 in collecting tank 12, then fixed by magnetizing mediums injector 14
The addition magnetic medium of amount, is sufficiently mixed under the built-in stirring system effect in the blending tank 13 of magnetizing mediums with muddy water；It is mixed with
The muddy water of magnetizing mediums is delivered in superconduction magnetic separator 15 through muddy water pump P4, and the high-gradient intense magnetic field produced in superconductor 15.1 is made
Under, built-in rotatable metal link network 15.3 will be adsorbed with the magnetic medium drag-out of heavy metal in superconduction magnetic separator 15
Face, is then blown out magnetic medium using sky mouth of blowing the trumpet from metal link network 15.3, and is entered into cyclone separator and carried out
Solid and gas is separated, and the magnetic medium for obtaining is recycled in rejoining blending tank 13；Non magnetic bulky grain in leachates
Thing is deposited to the bottom of superconduction magnetic separator 15, and periodically sediment is delivered in soil sedimentation basin 19, muddy water after treatment
When middle heavy metal concentration is exceeded, muddy water is back in collecting tank 12 again, otherwise flows into the soil precipitation in sludge dewatering unit
Pond 19.
The supernatant of soil sedimentation basin 19 is entered into slurry pond 22, and base sludge is delivered to soil by sludge pump P7
Dewaterer 20 carries out mud-water separation, and clean soil 21 is obtained after press filtration, and press filtration water is delivered in slurry pond 22, when washing
When the water for washing collection in millpond 22 detects up to standard through online water quality testing meter 23, magnetic valve F3 is opened and F4 is closed, clarified water pump
P12 is closed, and the water outlet of slurry pond 22 is back in muddy water mixing pond 8 and roller-type stone washing machine 6 through clarified water pump P8；Otherwise it is electric
Magnet valve F3 is closed and F4 is opened, and the water outlet of slurry pond 22 is delivered to regulating reservoir 24 through clarified water pump P8, and clarified water pump P12 is opened, and is returned
It is delivered in mixing pond 8 and roller-type stone washing machine 6 through clarified water pump P12 with the water outlet of water storage pool 34.
When organic concentration is exceeded in slurry pond 22, the water outlet of slurry pond 22 is delivered to regulating reservoir through clarified water pump P8
24, according to water water and water quality situation, by the quantitative addition acid solution of acid solution storage tank 24, solution ph is adjusted to 3-4, it is acid
Waste water is delivered in iron-carbon micro-electrolysis retort 26 through clarified water pump P9 from bottom, and blasts air inwards by air compressor machine 27,
Under oxygen in water effect, a large amount of Fe produced on anode2+By Quick Oxidation into Fe3+, being formed has adsorption-flocculation higher activity
Flocculant；Cathode reaction produces the hydroxyl of a large amount of nascent states, under conditions of slant acidity, these active components energy and waste water
In many components occur redox reaction, make organic macromolecule occur chain-scission degradation；Carry not oxidized Fe2+Waste water
Enter into Fenton reactive tanks 28, H is then quantitatively adding by dioxygen water storage tank 292O2, make H2O2The Fe generated with light electrolysis2 +Fenton reagent is constituted, the hydroxyl radical free radical attack organic molecule with strong oxidizing property for producing is reacted, further mineralising is decomposed
Organic matter, and reach the purpose of organics removal；Water after treatment is delivered to coagulative precipitation tank 31 through clarified water pump P10, by helping
Solidifying agent storage tank 30 is quantitatively adding the precipitate and separate that flocculation aid accelerates iron floccule body, and the supernatant of coagulative precipitation tank 31 is delivered to recycle-water
In storage pool 34, the base sludge of coagulative precipitation tank 31 is delivered to sludge dewatering equipment 32 and carries out press filtration through sludge pump P11, obtains mud cake
33, press filtration water is entered into recycle-water storage pool 34, when slurry pond overproof water quality, the water warp in recycle-water storage pool 34
Clarified water pump P12 is delivered in muddy water mixing pond 8 and roller-type stone washing machine 6.
From figs. 3 and 4 it can be seen that being continuously added with magnetic medium, Heavy Metals in Contaminated Soils lead and arsenic are accumulated
Removal amount is first raised, after tend to be steady, often process 1000m3Contaminated soil, the lead that can be removed and arsenic weight respectively 1800g
And 100g；
Heavy-metal contaminated soil accumulated process amount is as shown in table 1 with lead and arsenic leaching concentration relation.As it can be seen from table 1
Maximum leaching concentration difference 0.056mg/L, 0.041mg/L of before processing, Heavy Metals in Contaminated Soils lead and arsenic, by the present invention
After system treatment, the leaching concentration of heavy metal in soil lead and arsenic is all far below environmental standard value 0.01mg/L, 0.01mg/L, place
Reason result is completely up to standard.
Table 1
Specific embodiment described herein is only to the spiritual explanation for example of the present invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from spirit of the invention or surmount scope defined in appended claims.
Claims (6)
1. a kind of heavy-metal contaminated soil leaching repairing method, it is characterised in that including
Soil breaking step, crushes to contaminated soil and its impurity, and the soil after crushing is delivered to cylinder by belt feeder
Roto-siofter；
Argillaceous sand stone separating step, the soil after being processed through disintegrating machine is sieved in tilted-putted cylinder roto-siofter, is screened
Go out sand and by the collecting tank in mud-water conveying to heavy metal Magneto separate unit；
Superconducting magnetic separating step, will add magnetic medium and mixes in sewage, the muddy water that will be mixed with magnetic medium passes through sewage
Pump is delivered in superconduction magnetic separator, built-in in superconduction magnetic separator under the high-gradient intense magnetic field effect that superconductor is produced
The magnetic medium that rotatable metal link network will be adsorbed with heavy metal takes liquid level out of；
Sludge dewatering step, the heavy metal muddy water up to standard excluded from superconducting magnetic separative element is entered into and sunk in soil sedimentation basin
Form sediment and separate.
2. a kind of heavy-metal contaminated soil leaching repairing method according to claim 1, it is characterised in that argillaceous sand stone is separated
In step,
Coarse fodder by particle diameter more than 10mm delivers to roller-type stone washing machine rotation scouring and obtains clean stone, will clean the muddy water for producing and send
The tiny sand isolated in muddy water in dewatering screen is delivered to again after entering roller-type stone washing machine water leg.
3. a kind of heavy-metal contaminated soil leaching repairing method according to claim 1, it is characterised in that silt particle separates step
In rapid,
Fines by particle diameter less than 10mm is delivered to during muddy water mixes pond and is sufficiently mixed free state in soil with water
Heavy metal is transferred in water from soil, and mixing muddy water is delivered into hydrocyclone isolates sand and muddy water, and sand is passed through
Water conservancy cyclone bottom being exited into after carry out girt-water separation in dewatering screen and obtaining clean sand, and water conservancy cyclone top is gone out
Muddy water in the muddy water and dewatering screen water leg that come together is transported in the collecting tank in heavy metal Magneto separate unit.
4. a kind of heavy-metal contaminated soil leaching repairing method according to claim 1, it is characterised in that superconduction separates step
In rapid,
Then magnetic medium is blown out on the net from metallic bond using sky mouth of blowing the trumpet, and enters into solid and gas is carried out in cyclone separator
Separate, the magnetic medium for obtaining is recycled in rejoining blending tank；Non magnetic bulky grain thing precipitation in leachates
To superconduction magnetic separator bottom, and periodically sediment is delivered in soil sedimentation basin, heavy metal is dense in muddy water after treatment
When spending exceeded, muddy water is back in collecting tank again, otherwise flows into the soil sedimentation basin in sludge dewatering unit.
5. a kind of heavy-metal contaminated soil leaching repairing method according to claim 1, it is characterised in that sludge dewatering is walked
In rapid,
Supernatant is entered into slurry pond in soil sedimentation basin, and sludge is delivered to sludge dewatering equipment and carries out muddy water through sludge pump
Separate, clean soil is obtained after sludge press filtration, the water of generation is collected into slurry pond.
6. a kind of heavy-metal contaminated soil leaching repairing method according to claim 1, it is characterised in that also including reuse
Depth of waterization treatment, will carry not oxidized Fe2+Waste water is entered into Fenton reactive tanks, is subsequently adding H2O2, make H2O2With
The Fe of light electrolysis generation2+Fenton reagent is constituted, the water after treatment is entered into coagulative precipitation tank and is quantitatively adding flocculation aid is added
The precipitate and separate of fast iron floccule body, supernatant is delivered in recycle-water storage pool, and base sludge is delivered to sludge and takes off in sedimentation basin
Water dispenser carries out press filtration, obtains mud cake, and the water of generation is entered into recycle-water storage pool, and the water in recycle-water storage pool is distinguished through pump
Reuse to muddy water mixes pond and roller-type stone washing machine.
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| CN108746172A (en) * | 2018-09-04 | 2018-11-06 | 曹荣翠 | Metal ingredient removes prosthetic appliance and soil remediation technique automatically in a kind of soil |
| CN109046770A (en) * | 2018-09-04 | 2018-12-21 | 曹荣翠 | A kind of soil restoring device and soil remediation method for removing metal ingredient |
| CN110899317A (en) * | 2019-12-25 | 2020-03-24 | 中国电建集团中南勘测设计研究院有限公司 | Cadmium-polluted farmland soil remediation method based on magnetic biochar |
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Application publication date: 20170623 |