CN106881342A - A kind of heavy-metal contaminated soil drip washing repair system and method - Google Patents

A kind of heavy-metal contaminated soil drip washing repair system and method Download PDF

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Publication number
CN106881342A
CN106881342A CN201710176867.6A CN201710176867A CN106881342A CN 106881342 A CN106881342 A CN 106881342A CN 201710176867 A CN201710176867 A CN 201710176867A CN 106881342 A CN106881342 A CN 106881342A
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CN
China
Prior art keywords
soil
water
tank
heavy
metal
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CN201710176867.6A
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Chinese (zh)
Inventor
柯国洲
彭书平
李慧
朱丽
徐涛
李卓益
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Hubei Bao Hua Hua Environmental Protection Technology Co Ltd
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Hubei Bao Hua Hua Environmental Protection Technology Co Ltd
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Priority to CN201710176867.6A priority Critical patent/CN106881342A/en
Publication of CN106881342A publication Critical patent/CN106881342A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/025High gradient magnetic separators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B09DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09CRECLAMATION OF CONTAMINATED SOIL
    • B09C1/00Reclamation of contaminated soil
    • B09C1/02Extraction using liquids, e.g. washing, leaching, flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/48Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/488Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06Contaminated groundwater or leachate

Abstract

The present invention relates to a kind of Soil leaching repair system and method, belong to heavy metal pollution of soil and administer field, and in particular to a kind of heavy-metal contaminated soil drip washing repair system and 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

A kind of heavy-metal contaminated soil drip washing repair system and method
Technical field
The present invention relates to a kind of Soil leaching repair system and method, belong to heavy metal pollution of soil and administer field, specifically It is related to a kind of heavy-metal contaminated soil drip washing repair system and 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 The technical problem of high cost, there is provided a kind of heavy-metal contaminated soil drip washing repair system and method.The present invention passes through eluent Heavy metal is transferred in leacheate from soil, magnetic medium is recycled as sorbing material, in quick adsorption leacheate Each metal ion species, making it difficult to which the heavy-metal contaminated soil of reparation is recovered rapidly.Effect of the magnetic medium in high-intensity magnetic field Under be adsorbed in three-dimensional paramagnetic metal link network, magnetizing mediums is taken out of and reclaimed by the machine driving of metal link network, improve magnetic The utilization rate planted, reduces rehabilitation cost.
Above-mentioned purpose of the invention is mainly and is addressed by following technical proposals:
A kind of heavy-metal contaminated soil drip washing repair system, including:Soil breaking system, the soil argillaceous sand stone being sequentially connected Piece-rate system, superconduction magnetic separation system, sludge dewatering system and recycle-water in-depth processing system.
Optimization, a kind of above-mentioned heavy-metal contaminated soil drip washing repair system, the soil breaking system includes:Soil Storage feed bin, soil crusher and belt feeder are sequentially connected with composition.
The soil argillaceous sand stone piece-rate system includes:Cylinder roto-siofter, muddy water mixing pond, the waterpower rotation being sequentially connected Stream device, dewatering screen;The import of the cylinder roto-siofter is connected with belt feeder, and its fines outlet connection muddy water mixes pond, slightly Material outlet connection roller-type stone washing machine, the roller-type stone washing machine coarse fodder port of export is connected with belt feeder, the mud that roller-type stone washing machine bottom is set Water collecting groove water side is connected with dewatering screen charging aperture.
The superconduction magnetic separation system includes:Import is connected with the hydrocyclone light substance port of export, dewatering screen water side Collecting tank;The collecting tank connects blending tank;The blending tank is connected with magnetizing mediums injector, magnetizing mediums extraction mechanism, institute State the connection superconduction magnetic separator of magnetizing mediums extraction mechanism.
The sludge dewatering system includes:Soil sedimentation basin, soil dehydration machine and the slurry pond being sequentially connected, wherein Soil sedimentation basin entrance point is connected with Magneto separate tank body overfall and mud discharging mouth respectively, its water side and slurry pond entrance point It is connected, the slurry pond port of export mixes pond with muddy water respectively and roller-type stone washing machine is connected.
The recycle-water in-depth processing system includes:Regulating reservoir, acid storage tank, iron-carbon micro-electrolysis retort, air compressor machine, Fenton reactive tanks, dioxygen water storage tank, flocculation aid storage tank, coagulative precipitation tank, sludge dewatering equipment, recycle-water storage pool, wherein, adjust Section pond be connected with slurry pond and acid storage tank respectively with front end, wherein end be sequentially connected iron-carbon micro-electrolysis retort, Fenton reactive tanks, coagulative precipitation tank, sludge dewatering equipment and recycle-water storage pool;Wherein Fenton reactive tanks and coagulative precipitation tank Entrance point is connected with dioxygen water store tank and flocculation aid storage tank respectively;Recycle-water storage pool mixes pond and rolling with muddy water respectively Cylinder stone scrubber is connected, and coagulative precipitation tank supernatant water side is connected with recycle-water storage pool.
Optimization, a kind of above-mentioned heavy-metal contaminated soil drip washing repair system, the acid storage tank is used for storage industry sulphur At least one in acid or hydrochloric acid, the flocculation aid storage tank is used to store polyacrylamide.
Optimization, a kind of above-mentioned heavy-metal contaminated soil drip washing repair system, the magnetizing mediums extraction mechanism includes:Rotation Wind separator and vavuum pump, the cyclone separator inlet port are connected with negative pressure horn mouth, end cyclonic separation outlet port It is sequentially connected with vavuum pump and malleation horn mouth, the cyclone separator discharge outlet is in blending tank top.
Optimization, a kind of above-mentioned heavy-metal contaminated soil drip washing repair system, soil storage feed bin side wall is equipped with broken arch Motor and plate vibrator, prevent blanking from blocking;The soil crusher is used for the broken of contaminated soil and its impurity;The skin It is used to be delivered to the soil after crushing in cylinder roto-siofter with machine.
Optimization, a kind of above-mentioned heavy-metal contaminated soil drip washing repair system is provided with medium throwing on the blending tank Mouth is put, the outlet of the blending tank is connected with the inlet of the superconduction magnetic separator, the superconduction magnetic separator is located at magnetic field In region, it is internally provided with and links in the metal link network on driving wheel, and the metal link network extends at least partially into magnetizing mediums and carries Two skies being oppositely arranged in mechanism are taken to blow the trumpet between mouth;One of sky blows the trumpet mouth for malleation, and another sky is blown the trumpet Mouthful it is negative pressure, and the sky mouth of blowing the trumpet of negative pressure connects several solid-gas separators.
A kind of sewage water treatment method, sewage disposal is carried out using above-mentioned system.
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, the belt feeders of 4.4- the 4th, the belt feeders of 4.5- the 5th, 5- cylinder roto-siofters, 6- rollers are washed 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;The delivery port pipeline of the slurry pond 22 is to being provided with 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 pond 22, The 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 adsorption-flocculation higher The flocculant of activity;Cathode reaction produces the hydroxyl of a large amount of nascent states, and under conditions of slant acidity, these active components can be with There is redox reaction in many components in waste water, make organic macromolecule that chain-scission degradation to occur;The air compressor machine 27 be used for Air is passed through in iron-carbon micro-electrolysis retort 26, accelerates 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 mixes, and enables to be difficult in water the particle that precipitates and is aggregated with one another to form colloid and precipitate and separate;The sludge dewatering equipment 32 is used for Sludge to the discharge of the bottom of coagulative precipitation tank 31 carries out mud-water separation;The recycle-water storage pool 34 is used for coagulative precipitation tank 31 The collection storage of clear liquid and the pressure filtration yielding water of sludge dewatering equipment 32, and provide use for roller-type stone washing machine 6 and muddy water mix pond 8 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, magnetic is situated between Matter 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 superconductor Under the 15.1 High-gradient Magnetic field actions for providing, 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 kind for being adsorbed with heavy metal is carried over liquid level, is then carried by magnetizing mediums Mechanism 18 is taken to be recycled;Under vavuum pump P5 effects, by two pressure-vaccum loudspeakers being arranged on Magneto separate tank body 15.2 Magnetizing mediums is separated and sequentially entered to primary cyclone 18.1 and secondary cyclone by mouth from metal link network 15.3 Magnetic kind recovery is carried out in 18.2, the magnetic kind that will be recovered to is recycled in being added to blending tank 13 again;By superconducting magnetic Muddy water after the treatment of seperator 15, if heavy metal concentration detection is exceeded, magnetic valve F1 is opened and magnetic valve F2 is closed, muddy water warp Muddy water pump P6 is reprocessed in being back to collecting tank;Otherwise magnetic valve F1 is opened and magnetic valve F2 is closed, and muddy water is through muddy water pump P6 is delivered in soil sedimentation basin 19.
(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 (7)

1. a kind of heavy-metal contaminated soil drip washing repair system, it is characterised in that including:The soil breaking system that is sequentially connected, Soil argillaceous sand stone piece-rate system, superconduction magnetic separation system, sludge dewatering system and recycle-water in-depth processing system.
2. a kind of heavy-metal contaminated soil drip washing repair system according to claim 1, it is characterised in that the soil breaks Broken system includes:Soil storage feed bin, soil crusher and belt feeder are sequentially connected with composition;
The soil argillaceous sand stone piece-rate system includes:Cylinder roto-siofter, muddy water mixing pond, the hydraulic cyclone being sequentially connected Device, dewatering screen;The import of the cylinder roto-siofter is connected with belt feeder, and its fines outlet connection muddy water mixes pond, coarse fodder Outlet connection roller-type stone washing machine, the roller-type stone washing machine coarse fodder port of export is connected with belt feeder, the muddy water that roller-type stone washing machine bottom is set Collecting tank water side is connected with dewatering screen charging aperture;
The superconduction magnetic separation system includes:The receipts that import is connected with the hydrocyclone light substance port of export, dewatering screen water side Collection tank;The collecting tank connects blending tank;The blending tank is connected with magnetizing mediums injector, magnetizing mediums extraction mechanism, the magnetic Medium extraction mechanism connects superconduction magnetic separator;
The sludge dewatering system includes:Soil sedimentation basin, soil dehydration machine and the slurry pond being sequentially connected, wherein soil Sedimentation basin entrance point is connected with Magneto separate tank body overfall and mud discharging mouth respectively, its water side and slurry pond entrance point phase Even, the slurry pond port of export mixes pond with muddy water respectively and roller-type stone washing machine is connected;
The recycle-water in-depth processing system includes:Regulating reservoir, acid storage tank, iron-carbon micro-electrolysis retort, air compressor machine, Fenton are anti- Answer groove, dioxygen water storage tank, flocculation aid storage tank, coagulative precipitation tank, sludge dewatering equipment, recycle-water storage pool, wherein, regulating reservoir with it is preceding End be connected with slurry pond and acid storage tank respectively, wherein end be sequentially connected iron-carbon micro-electrolysis retort, Fenton reactive tanks, Coagulative precipitation tank, sludge dewatering equipment and recycle-water storage pool;Wherein Fenton reactive tanks and coagulative precipitation tank entrance point respectively with Dioxygen water store tank is connected with flocculation aid storage tank;Recycle-water storage pool mixes pond and roller-type stone washing machine phase with muddy water respectively Even, coagulative precipitation tank supernatant water side is connected with recycle-water storage pool.
3. a kind of heavy-metal contaminated soil drip washing repair system according to claim 2, it is characterised in that the acid storage tank For at least one in storage industry sulfuric acid or hydrochloric acid, the flocculation aid storage tank is used to store polyacrylamide.
4. a kind of heavy-metal contaminated soil drip washing repair system according to claim 2, it is characterised in that the magnetizing mediums Extraction mechanism includes:Cyclone separator and vavuum pump, the cyclone separator inlet port are connected with negative pressure horn mouth, end rotation Wind separates outlet port and is sequentially connected with vavuum pump and malleation horn mouth, and the cyclone separator discharge outlet is on blending tank Side.
5. a kind of heavy-metal contaminated soil drip washing repair system according to claim 2, it is characterised in that soil storage material Cang Cebi is equipped with broken arch motor and plate vibrator, prevents blanking from blocking;The soil crusher is used for contaminated soil and its miscellaneous Matter it is broken;The belt feeder is used to be delivered to the soil after crushing in cylinder roto-siofter.
6. a kind of heavy-metal contaminated soil drip washing repair system according to claim 2, it is characterised in that the blending tank On be provided with medium dispensing port, the outlet of the blending tank is connected with the inlet of the superconduction magnetic separator, the superconducting magnetic Seperator is located in field region, and it is internally provided with and links in the metal link network on driving wheel, and the metal link network is at least part of Two skies being oppositely arranged in magnetizing mediums extraction mechanism are extended to blow the trumpet between mouth;One of sky blows the trumpet mouth for malleation, Another sky blows the trumpet mouth for negative pressure, and the sky mouth of blowing the trumpet of negative pressure connects several solid-gas separators.
7. a kind of sewage water treatment method, it is characterised in that carry out sewage disposal using the system described in any of the above-described claim.
CN201710176867.6A 2017-03-23 2017-03-23 A kind of heavy-metal contaminated soil drip washing repair system and method Pending CN106881342A (en)

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Application publication date: 20170623