CN106904703A - A kind of method of heavy-metal contaminated soil leachates treatment - Google Patents
A kind of method of heavy-metal contaminated soil leachates treatment Download PDFInfo
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- CN106904703A CN106904703A CN201710177097.7A CN201710177097A CN106904703A CN 106904703 A CN106904703 A CN 106904703A CN 201710177097 A CN201710177097 A CN 201710177097A CN 106904703 A CN106904703 A CN 106904703A
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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
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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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- 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
-
- 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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The present invention relates to a kind of method of heavy-metal contaminated soil leachates treatment.Including：Washing unit, heavy metal Magneto separate unit, the precipitation dewatering unit being sequentially connected；Wherein, the washing unit is specifically included：Soil leaching tower, its inlet is connected by spray pump P2 with drip washing thinning tank, and its liquid outlet is connected with leachates recovery pond；The drip washing thinning tank is connected by eluent dope measuring pump with eluent storage tank；The leachates recovery pond is connected with the import of Soil leaching tower and collecting tank；The features such as device and method has small floor space, skid-mounted type and processed suitable for big yield leachates, can improve heavy metals removal speed in leachates；The addition of subsequent processing units flocculant and flocculation aid can be reduced, is conducive to the decrement of sludge, and the Water circulation that sludge is produced after dewaterer treatment reduces front end Soil leaching rate of water make-up to the dilution of eluent.
Description
Technical field
The present invention relates to a kind of leachates processing method, belong to heavy metal pollution of soil and administer field, and in particular to be a kind of
The method of heavy-metal contaminated soil leachates treatment.
Background technology
With China's rapid development of economy, extensive mode of economic development causes soil pollution situation severe exacerbation.
According to national Soil Pollution Investigation publication in 2014, the area of China 16.1% was contaminated, 19.4% arable land
It is contaminated, about 1/3rd industrial sites investigated are contaminated.Soil pollution type is organic based on heavy metal pollution
Thing pollution is taken second place, and compound pollution proportion is smaller.Cause the heavy metal of soil pollution mainly include cadmium, mercury, arsenic, copper, lead, chromium,
Zinc and nickel, have disguise, cumulative bad, hysteresis quality and toxicity relatively strong and easily by the spy of bio-absorbable due to heavy metal in soil
Point, thus it is very urgent for heavy metal pollution of soil repair.
Current heavy metal pollution of soil recovery technique mainly includes biological prosthetic, peripheral doses, chemical remediation and its joint
Recovery technique, and Soil leaching technology because its have rapidly and efficiently, treating capacity is big and with low cost the features such as it is wide at home and abroad
It is general to use.Although soil washing has the advantages that long-lasting, ease for operation and high osmosis, a large amount of leachates need place
Reason, the complex compound rich in heavy metal with eluent in leachates, if do not dealt carefully with, can exist to underground water and pollute
Risk.
The chemical leachates treatment technology of current development and application mainly has chemical method, Physical, bioanalysis.Chemical method
By change heavy metal in leachates existence and be removed, such as using chemical precipitation, redox and electrolysis skill
Art etc., the method is subject to the problem of precipitating reagent and reductant-oxidant secondary pollution and electrolysis tech high cost；Physical refer to
Keep being excluded in the case that metallochemistry form is constant, such as pass through ion exchange, solvent extraction and UF membrane technology
To the heavy metal in leachates carry out concentration realize separate, in the method by ion-exchanger species, yield and cost impact with
And the problems such as fouling membrane, fouling and corrosion；Bioanalysis is using the effect drop such as absorption, conversion, enrichment of microorganism heavy metal
Heavy metal concentration in low or elimination leachates, bioremediation has the advantages such as the low, high treating effect of operating cost, but together
Defect that when has that time-consuming, microorganism is easily poisoned, resistance to overload shock ability is weaker, sludge output is big etc..
The content of the invention
The present invention is mainly solved in the prior art rich in heavy metal leachates treatment effeciency is low, floor space big and produces mud
A kind of amount problem high, it is proposed that method of heavy-metal contaminated soil leachates treatment.The equipment and method have floor space
Small, skid-mounted type and the features such as processed suitable for big yield leachates, can improve heavy metals removal speed in leachates；Using magnetic
Heavy metal in medium adsorbing separation leachates, can reduce the addition of subsequent processing units flocculant and flocculation aid, favorably
In the decrement of sludge, and the Water circulation that sludge is produced after dewaterer treatment reduces front end soil to the dilution of eluent
Drip washing rate of water make-up.
Above-mentioned technical problem of the invention is mainly what is be addressed by following technical proposals：
A kind of method of heavy-metal contaminated soil leachates treatment, including：
Soil leaching step, leacheate is sprayed on heavy-metal contaminated soil, is then complexed and molten by desorption, instead
From the soil of solid phase be transferred in leachates heavy metal in soil by solution effect；
Superconducting magnetic separating step, superconduction magnetic separator is delivered to in heavy metals exceeding standard leachates after addition magnetic medium
In, heavy metal is separated from leachates；
Sludge settling dehydration, is sent in mudpan to the bed mud discharged in superconduction magnetic separator and is precipitated
Separate.
Optimization, the method that a kind of above-mentioned heavy-metal contaminated soil leachates are processed, in the Soil leaching step, will
Heavy-metal contaminated soil is delivered to Soil leaching tower through belt conveyor, and eluent stoste and water are respectively from eluent storage tank and storage
Quantitative being flowed into drip washing thinning tank mixes in pond, and the eluent after dilution is well mixed is fixed by flowmeter and spray pump
That measures is input to eluting column, is uniformly sprayed onto on heavy-metal contaminated soil by eluting column spray system, then by desorption
From the soil of solid phase be transferred in leachates heavy metal in soil by attached, anti-complexing and dissolution, and leachates are from eluting column
Bottom is flowed into leachates recovery pond, is processed clean soil and is delivered to soil stacking field through belt feeder；
Optimization, the method that a kind of above-mentioned heavy-metal contaminated soil leachates are processed, in the superconducting magnetic separating step,
After heavy metals exceeding standard leachates are delivered into collecting tank through leachates reflux pump, quantitatively it is input into blending tank by sewage pump；Root
According to the matter requirement of mixing tank body reclaimed water, magnetic medium is quantitatively provided by magnetic kind chemicals dosing plant, magnetic medium is stirred stirring system
Mix down and be sufficiently mixed with leachates；The leachates of magnetic medium will be mixed with to be delivered in superconduction magnetic separator by sewage pump,
Under the high-gradient intense magnetic field effect that superconductor is produced, built-in rotatable metal link network will be adsorbed with weight in superconduction magnetic separator
The magnetic medium of metal takes liquid level out of, is then blown out magnetic medium on the net from metallic bond using sky mouth of blowing the trumpet, and enter into
Solid and gas separation is carried out in cyclone separator, the solid powder for obtaining is recycled in rejoining blending tank；In leachates
Non magnetic bulky grain thing be deposited to superconduction magnetic separator bottom, and periodically sediment exclusion, leachates after treatment are with much money
During category concentration over-standard, leachates are back in collecting tank again, otherwise in flowing into mixing pit.
Optimization, the method that a kind of above-mentioned heavy-metal contaminated soil leachates are processed, sludge settling dehydration, to mixed
Flocculant is quantitatively adding in conjunction pond and flocculation aid is mixed, the bed mud discharged in mixed water and superconduction magnetic separator
Entering into carries out precipitate and separate in mudpan, upper water is entered into tank, and lower floor's mud enters into plate through sludge pump
Frame filter press, by press filtration into mud cake after sludge dewatering, the moisture of generation is flowed into tank, and the water in tank is through pump reflux
Recycled in eluent storage tank.
Optimization, the method that a kind of above-mentioned heavy-metal contaminated soil leachates are processed, in the Soil leaching step, when
When liquid level is relatively low in leachates recovery pond, spray pump is opened and reflux pump is closed, and eluent is constantly sprayed onto from thinning tank
On soil, the eluent for carrying heavy metal is entered into leachates recovery pond, and liquid level is constantly raised in causing pond, when liquid level reaches
During to liquid level gauge setting height, spray pump is closed and reflux pump and return flow solenoid valve unlatching work；With the increase of reflow's cycle,
Heavy metal concentration is raised in causing leachates, and when heavy metal concentration exceedes relevant criterion, return flow solenoid valve is closed and discharge electricity
Magnet valve is opened, and heavy metals exceeding standard leachates are delivered to superconducting magnetic separative element and are processed through reflux pump, is drenched with recovery pond
Go out liquid constantly to reduce, liquid level is constantly reduced in recovery pond, when standard of the liquid level less than liquid level gauge setting, system enters next round
Circulation.
Optimization, the method that a kind of above-mentioned heavy-metal contaminated soil leachates are processed, the implementation of the method is based on successively
The washing unit of connection, heavy metal Magneto separate unit, precipitation dewatering unit；
Wherein, the washing unit is specifically included：
Soil leaching tower, its inlet is connected by spray pump P2 with drip washing thinning tank, and its liquid outlet is reclaimed with leachates
Pond is connected；The drip washing thinning tank is connected by eluent dope measuring pump P3 with eluent storage tank；The leachates recovery pond
It is connected with the outlet of Soil leaching tower and the import of collecting tank；
The heavy metal Magneto separate unit is specifically included：
Blending tank, its import is connected with the outlet of collecting tank, and its outlet is connected with superconduction magnetic separator inlet, described mixed
Close tank top and the magnetizing mediums dispensing port being connected with the magnetic kind chemicals dosing plant port of export is set；The magnetizing mediums of superconduction magnetic separator is reclaimed out
Mouth is connected by cyclone separator with magnetizing mediums dispensing port；
The precipitation dewatering unit is specifically included：
Mixing pit, mudpan, sludge dewatering equipment, tank and the storage mud groove being sequentially connected；Wherein, the mixing pit
Inlet is connected with the overfall of superconduction magnetic separator；The import of the mixing pit is added by flocculant chemicals dosing plant, flocculation aid
Medicine device is connected；
Wherein,
Liquid level gauge is installed inside the leachates recovery pond, is installed back on the leachates recovery pond bottom reflux line
Stream pump P1, the reflux pump P1 are connected by return flow solenoid valve F1 with Soil leaching tower import, and the reflux pump P1 passes through to discharge
Magnetic valve F2 is connected with collecting tank.
Inlet, overfall, mud discharging mouth and two air pressure-vaccum horn mouths are set in the superconduction magnetic separator, it is described enter
Liquid mouthful and overfall distinguish internally positioned metal link network both sides, and mud discharging mouth is located at Magneto separate tank base, wherein, the overfall
It is connected with collecting tank and mixing pit respectively, mud discharging mouth is connected by sludge pump with mudpan, the horn mouth one is for just
Pressure, another is negative pressure.
Sludge pump is equipped with pipeline between the mudpan entrance point and superconduction magnetic separator mud discharging mouth end；It is described
Mudpan overfall is connected with tank, and the base sludge in the mudpan is delivered to sludge and takes off through sludge pump P7
Water dispenser；The sludge dewatering equipment is plate and frame filter press, and the plate and frame filter press mud discharging mouth is connected with storage mud groove, the plate compression
Machine leakage fluid dram is connected with tank.
Therefore, the invention has the advantages that：
1st, using the heavy metal in magnetic medium adsorbing separation leachates, subsequent processing units flocculant can be reduced and is helped
The addition of solidifying agent, is conducive to the decrement of sludge.
2nd, non-wastewater discharge, the Water circulation that sludge is produced after being processed through dewaterer reduces front end to the dilution of eluent
Soil leaching rate of water make-up.
Brief description of the drawings
Accompanying drawing 1 is a kind of schematic diagram of the invention；
In figure, 1.1 first belt feeders, 1.2 second belt feeders, 2 eluting columns, 3 leachates recovery ponds, 4 drip washing thinning tanks, 5
Eluent storage tank, 6 collecting tanks, 7 blending tanks, 8 magnetic kind chemicals dosing plants, 9 superconduction magnetic separators, 10 cyclone separators, 11 flocculants
Chemicals dosing plant, 12 flocculation aid chemicals dosing plants, 13 mixing pits, 14 mudpans, 15 sludge dewatering equipments, 16, storage mud groove, 17 water storages
Pond, P1 reflux pumps, P2 spray pumps, P3 eluent dopes measuring pump, P4 intake pumps, P5 dredge pumps, P6 vavuum pumps, sludge pump P7,
Sludge pump P8, P9 reuse water pump, F1 return flow solenoid valves, F2 discharge solenoid valves, F3 backflows ball valve, F4 ball-valves, V1 spray streams
Gauge, V2 blending waters flowmeter, V3 vacuum tables.
Specific embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
As shown in figure 1, being a kind of heavy-metal contaminated soil leachates processing equipment of the present embodiment.In figure：
First belt feeder 1.1, for the charging of heavy-metal contaminated soil in eluting column；
Second belt feeder 1.2, the discharging for processing rear soil up to standard in eluting column；
Eluting column 2, is cleaned for heavy metal contaminated soil, and top is evenly distributed with shower nozzle, the drip washing after dilution
Agent is uniformly sprayed on heavy-metal contaminated soil；
Leachates recovery pond 3, for collecting the leachates flowed out in eluting column, the leachates of collection are circulated through reflux pump P1
Use；
Drip washing thinning tank 4, for keeping in dense diluent and water mixed dilute eluent in proportion；
Eluent storage tank 5, for being stored to detergent original dope, it is dilute that dope is delivered to drip washing through eluent dilution pumps
Release and mixed in proportion with water in tank；
Collecting tank 6, for receiving the leachates from heavy metals exceeding standard in leachates recovery pond；
Blending tank 7, is stirred with heavy metals exceeding standard leachates for magnetic kind and mixes；
Magnetic kind chemicals dosing plant 8, for the loss of the magnetic kind required for heavy metal treatment in blending tank and supplement magnetic kind；
Superconduction magnetic separator 9, for the separation of magnetic kind in mixed solution, will be inhaled by the rotatable metal link network for setting
The magnetic kind of attached heavy metal takes superconduction magnetic separator out of；
Cyclone separator 10, the recycling for putting forward magnetic kind；
Flocculant chemicals dosing plant 11, for flocculant is quantitatively adding in mixing pit, contributing to solution suspension particles agglomerate
Connection forms thick cotton-shaped granule or agglomerate；
Flocculation aid chemicals dosing plant 12, for flocculation aid is quantitatively adding in mixing pit, accelerating flocculation sediment speed；
Mixing pit 13, solution up to standard is processed for receiving the heavy metal given off through superconduction magnetic separator overfall, is passed through
Flocculant and flocculation aid are quantitatively adding, accelerate the removal of other impurities in solution.
Mudpan 14, be mixed with the solution of flocculant and flocculation aid in mixing pit 13, and carry out place of settling for receiving
Reason, obtains recycle-water and sludge；
Sludge dewatering equipment 15, carries out dehydration compression treatment, and obtain mud cake for the sludge to mudpan out；
Storage mud groove 16 is used to store the mud cake of the generation of sludge dewatering equipment 15；
Tank 17, the outlet pipe with connection drip washing thinning tank 4, and with mudpan 14 and sludge dewatering equipment 15
Connected filling pipe.
The structure of the present embodiment can be divided into three units, be respectively heavy-metal contaminated soil washing unit, leachates
Heavy metal Magneto separate unit and sludge settling dewatering unit.
Wherein, heavy-metal contaminated soil washing unit includes being sequentially connected eluent storage tank, dilution measuring pump, drip washing are dilute
Release tank, spray pump, flowmeter, eluting column, leachates recovery pond, reflux pump and return flow solenoid valve；Wherein, the eluent storage tank
For storing high concentration eluent, the high concentration eluent is chelating agent, and the chelating agent is ethylenediamine tetra-acetic acid, amino three
In acetic acid, diethyl pentetic acid, EDDS, citric acid, malic acid, oxalic acid, Humic acids and fulvic acids extremely
Few one kind；The eluent of the high concentration through dilute measuring pump be delivered in eluent thinning tank with the water in tank according to
Certain proportion is prepared by mixing into the eluent of low concentration, and the eluent thinning tank contains automatic blending system；The eluent
Eluting column top is quantitatively transferred to by spray pump and flowmeter；The eluting column top is provided with equally distributed shower nozzle, it is ensured that
Eluent is uniformly sprayed on soil, and the eluting column is provided with automatic feed mouthful and discharging opening；The leachates recovery pond is used for
The leachates of drip washing tower bottom outflow are collected, liquid level gauge, the leachates recovery pond are installed inside the leachates recovery pond
Reflux pump and return flow solenoid valve are installed on the reflux line of bottom, are installed on pipeline between the reflux pump magnetic valve and collecting tank
There is discharge solenoid valve；The leachates backflow pool be in heavy metal concentration in high level and leachates it is not exceeded when, reflux pump and
Return flow solenoid valve is opened, and spray pump is stopped, and leachates are back to eluting column top through reflux pump；The leachates backflow pool
When heavy metal concentration is exceeded in high level and leachates, return flow solenoid valve is closed and discharge solenoid valve is opened, and spray pump stops
Only work；When the high level is changed into low liquid level, reflux pump, return flow solenoid valve and discharge solenoid valve are closed, and spray pump is opened.
Wherein, leachates heavy metal Magneto separate unit includes collecting tank, blending tank, magnetic kind chemicals dosing plant, superconduction Magneto separate
Machine and magnetizing mediums reclaimer；Wherein, the import of the collecting tank is connected with leachates reflux pump one outlet end, the collection
Tank outlet is connected with the import of blending tank；The blending tank outlet separates tank body inlet with superconducting magnetic and is connected, the blending tank
Magnetizing mediums dispensing port is provided with above, the magnetizing mediums dispensing port is connected with the magnetic kind chemicals dosing plant port of export, the magnetic kind dosing dress
The consumption supplement for magnetic kind in Magneto separate mixing tank body is put, the magnetic kind includes iron powder, ferroferric oxide powder and its chemistry
At least one in improved ferroferric oxide nano particle, the chemical modification is using the organic polymer modification with special groups
Ferroferric oxide nano granules, enhancing ferroso-ferric oxide and heavy metal ion conjugation, the special groups include amino, carboxylic
At least one in base, hydroxyl and sulfydryl, the organic polymer includes acrylic acid, shitosan, glycine betaine, polypyrrole, polyphenyl
Second is dilute, oleic acid, dopamine, polyvinyl alcohol, POLYPROPYLENE GLYCOL, starch, vinyl acetate, polystyrene, polyethylene pyrrole network alkanone, silicon
At least one in acetoacetic ester etc.；The superconduction magnetic separator includes superconducting magnet, metal link network, Magneto separate tank body, refrigeration machine
And system control cabinet, the superconductor can dismantle, be replaced by cryogenic magnet or high-temperature superconducting magnet, the superconducting magnet
To providing predetermined high-gradient magnetic field inside superconduction separator；The metal link network is located at the Magneto separate tank body of high-gradient magnetic field
In, the magnetic kind of heavy metal is adsorbed with constantly as metal link network rotational band goes out Magneto separate tank body；Set on the Magneto separate tank body
Inlet, overfall, mud discharging mouth and two air pressure-vaccum horn mouths, the inlet and overfall are located at the metallic bond respectively
The both sides of net, mud discharging mouth be located at be located at Magneto separate tank base, wherein, the overfall respectively with collecting tank and mixing pit phase
Even, mud discharging mouth is connected by sludge pump with mudpan, and the horn mouth one is malleation, and another is negative pressure；The magnetic
Dielectric film filter equipment includes cyclone separator and vavuum pump, and the negative pressure horn mouth is connected with several cyclonic separations in parallel
Device, the vacuum pump discharges end is connected with malleation horn mouth.
Wherein, sludge settling dewatering unit includes the mixing pit, mudpan, sludge dewatering equipment, the water storage that are sequentially connected
Pond and storage mud groove；Wherein, the mixing pit inlet is connected with Magneto separate tank body overfall, the mixing pit and superconduction Magneto separate
Connecting pipe is provided with ball valve and sample tap between machine, and the mixing pit is connected with flocculant and flocculation aid chemicals dosing plant respectively,
The flocculant and flocculation aid are quantitatively added by measuring pump, and the mixing pit port of export is connected with mudpan entrance point；
Sludge pump is equipped with pipeline between the mudpan entrance point and Magneto separate tank body mud discharging mouth end, in superconduction magnetic separator
The bed mud of precipitation is delivered in mudpan through pump, and the mudpan overfall is connected with tank, and the sludge sinks
Base sludge in the pond of shallow lake is delivered to sludge dewatering equipment through sludge pump；The sludge dewatering equipment is plate and frame filter press, the sheet frame
Filter press mud discharging mouth is connected with storage mud groove, and the plate and frame filter press leakage fluid dram is connected with tank.
The course of work of the present embodiment is as follows：
1st, Soil leaching
Heavy-metal contaminated soil is fed in eluting column 2 through belt feeding machine 1, through the drip washing of eluent dope measuring pump P3
Agent stoste and water enter into from tank 17 and eluent storage tank 5 mixed in drip washing thinning tank in proportion respectively, prepare
Low concentration eluent, low concentration eluent is entered into eluting column 2 through spray pump P2 and spray flow meter V1, is flowed through heavy metal-polluted
The leachates that dye soil reaches the bottom of eluting column 2 are collected through leachates recovery pond 3, when leachates recovery pond 3 is in low liquid level,
Spray pump P2 works closed after leachates recovery pond 3 reaches high level always, now reflux pump P1 and return flow solenoid valve F1
Open, leachates enter circulated sprinkling process, when leachates heavy metal concentration is exceeded in leachates recovery pond 3, flow back electromagnetism
Valve F1 is closed, and discharge solenoid valve F2 is opened, and leachates are transported in collecting tank 6, when the liquid level of leachates recovery pond 3 is reduced to
During low liquid level, reflux pump P1 and discharge solenoid valve F2 is closed, spray pump unlatching work, into next round Sprayer Circulation process, warp
The percutaneous band discharging machine 1 of clean soil after the treatment of eluting column 2 is delivered to sludge stockyard.
2nd, leachates heavy metal superconduction Magneto separate
The leachates collected in collecting tank 6 are quantitatively transferred in blending tank 7 through intake pump P4, according to water quality and water, magnetic
Kind chemicals dosing plant 8 is quantitatively adding magnetic kind and leachates are stirred mixing, and the leachates for being mixed with magnetic kind are conveyed through dredge pump P5
Into superconduction magnetic separator 9, through superconducting magnetic centrifugation, the magnetic kind for being adsorbed with heavy metal is attracted to and is built in superconduction Magneto separate
The metallic bond of machine 9 is online, the magnetic kind of Adsorption of Heavy Metals is taken out of liquid level by the rotation of metal link network, and then vavuum pump P6 takes out
The recovery for magnetic kind being brought into cyclone separator 10 and entering magnetic kind is inhaled and purges, the magnetic kind of recovery rejoins blending tank 7
In recycled, through in superconduction magnetic separator 9 overfall discharge supernatant, if heavy metal is not up to standard ball valve F3 open
And ball valve F4 is closed, supernatant is back to collecting tank 6 and processes again, and F3 is closed and ball valve F4 is opened if treatment is up to standard, on
Clear liquid is delivered in mixing pit 13.
3rd, sludge settling dehydration
According to the water of mixing pit 13, flocculant chemicals dosing plant 11 and flocculation aid chemicals dosing plant 12 are respectively in mixing pit 13
Flocculant and flocculation aid are quantitatively adding, mixed liquor and the discharge of the mud discharging mouth of superconduction magnetic separator 9 of flocculant and flocculation aid is mixed with
Sludge is together transported to through sludge pump P7 and sludge settling separation, supernatant in mudpan 14 is carried out in mudpan 14
It is flowed into tank 17, base sludge is delivered to sludge dewatering equipment 15 and carries out dewatering and filtering mud through sludge pump P8, generation
Water is discharged into tank 17 and is reclaimed, and the sludge of generation is stored in storage mud groove 16, and the water in tank 17 is through reuse water pump
P9 and blending water flowmeter V2 carry out eluent thinned water in being quantitatively transferred to drip washing thinning tank 4.
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 method that heavy-metal contaminated soil leachates are processed, it is characterised in that including：
Soil leaching step, leacheate is sprayed on heavy-metal contaminated soil, is then made by desorption, anti-complexing and dissolving
It is transferred in leachates from the soil of solid phase with by heavy metal in soil；
Superconducting magnetic separating step, to being delivered in superconduction magnetic separator after adding magnetic medium in heavy metals exceeding standard leachates, will
Heavy metal is separated from leachates；
Sludge settling dehydration, being sent in mudpan to the bed mud discharged in superconduction magnetic separator carries out precipitation point
From.
2. the method that a kind of heavy-metal contaminated soil leachates according to claim 1 are processed, it is characterised in that the soil
In earth rinsing step, heavy-metal contaminated soil is delivered to Soil leaching tower through belt conveyor, eluent stoste and water are distinguished
Quantitative being flowed into drip washing thinning tank mixes from eluent storage tank and tank, and the eluent after dilution is well mixed passes through
Flowmeter and spray pump it is quantitative be input to eluting column, heavy-metal contaminated soil is uniformly sprayed onto by eluting column spray system
On, heavy metal in soil is transferred in leachates from the soil of solid phase by desorption, anti-complexing and dissolution then,
Leachates are flowed into leachates recovery pond from drip washing tower bottom, are processed clean soil and are delivered to soil stacking through belt feeder
.
3. the method that a kind of heavy-metal contaminated soil leachates according to claim 1 are processed, it is characterised in that described super
It is quantitative by sewage pump after heavy metals exceeding standard leachates are delivered into collecting tank through leachates reflux pump in magnetic conduction separating step
It is input into blending tank；According to the matter requirement of mixing tank body reclaimed water, magnetic medium, magnetic medium are quantitatively provided by magnetic kind chemicals dosing plant
It is sufficiently mixed with leachates under the stirring of stirring system；To be mixed with magnetic medium leachates be delivered to by sewage pump it is super
In magnetic conduction seperator, under the high-gradient intense magnetic field effect that superconductor is produced, built-in rotatable metal in superconduction magnetic separator
The magnetic medium that link network will be adsorbed with heavy metal takes liquid level out of, then using sky mouth of blowing the trumpet that magnetic medium is online from metallic bond
Blowout, and enter into solid and gas separation is carried out in cyclone separator, the solid powder for obtaining is carried out again in rejoining blending tank
Utilize；Non magnetic bulky grain thing in leachates is deposited to superconduction magnetic separator bottom, and periodically sediment exclusion, after treatment
Leachates heavy metal concentration it is exceeded when, leachates are back in collecting tank again, on the contrary flow into mixing pit in.
4. the method that a kind of heavy-metal contaminated soil leachates according to claim 1 are processed, it is characterised in that
Sludge settling dehydration, to being quantitatively adding flocculant in mixing pit and flocculation aid is mixed, mixed water
And the bed mud discharged in superconduction magnetic separator enters into and precipitate and separate is carried out in mudpan, upper water enters into tank
In, lower floor's mud enters into plate and frame filter press through sludge pump, and by press filtration into mud cake after sludge dewatering, the moisture of generation is flowed into storage
In pond, the water in tank is recycled in flowing to eluent storage tank through blowback.
5. a kind of method that heavy-metal contaminated soil leachates treatment is carried out using the said equipment according to claim 1,
Characterized in that, in the Soil leaching step, when liquid level is relatively low in leachates recovery pond, spray pump is opened and reflux pump is closed
Close, eluent is constantly sprayed onto on soil from thinning tank, the eluent for carrying heavy metal enters into leachates recovery pond
In, liquid level is constantly raised in causing pond, and when liquid level reaches liquid level gauge setting height, spray pump is closed and reflux pump and backflow electricity
Magnet valve unlatching work；With the increase of reflow's cycle, heavy metal concentration is raised in causing leachates, when heavy metal concentration exceedes phase
During the standard of pass, return flow solenoid valve is closed and discharge solenoid valve is opened, and heavy metals exceeding standard leachates are delivered to superconducting magnetic through reflux pump
Separative element is processed, and with recovery pond, leachates are constantly reduced, and liquid level is constantly reduced in recovery pond, when liquid level is less than liquid
During the standard of position meter setting, system is circulated into next round.
6. a kind of method that heavy-metal contaminated soil leachates treatment is carried out using the said equipment according to claim 1,
Characterized in that, the implementation of the method is based on the washing unit, heavy metal Magneto separate unit, precipitation dewatering unit being sequentially connected；
Wherein, the washing unit is specifically included：
Soil leaching tower, its inlet is connected by spray pump P2 with drip washing thinning tank, its liquid outlet and leachates recovery pond phase
Even；The drip washing thinning tank is connected by eluent dope measuring pump P3 with eluent storage tank；The leachates recovery pond and soil
The outlet of earth eluting column is connected with the import of collecting tank；
The heavy metal Magneto separate unit is specifically included：
Blending tank, its import is connected with the outlet of collecting tank, and its outlet is connected with superconduction magnetic separator inlet, the blending tank
Top sets the magnetizing mediums dispensing port being connected with the magnetic kind chemicals dosing plant port of export；It is logical that the magnetizing mediums of superconduction magnetic separator reclaims outlet
Cyclone separator is crossed to be connected with magnetizing mediums dispensing port；
The precipitation dewatering unit is specifically included：
Mixing pit, mudpan, sludge dewatering equipment, tank and the storage mud groove being sequentially connected；Wherein, the mixing pit feed liquor
Mouth is connected with the overfall of superconduction magnetic separator；The import of the mixing pit is filled by flocculant chemicals dosing plant, flocculation aid dosing
Put connected；
Wherein,
Liquid level gauge is installed inside the leachates recovery pond, reflux pump is installed on the leachates recovery pond bottom reflux line
P1, the reflux pump P1 are connected by return flow solenoid valve F1 with Soil leaching tower import, and the reflux pump P1 is by discharging electromagnetism
Valve F2 is connected with collecting tank.
Inlet, overfall, mud discharging mouth and two air pressure-vaccum horn mouths, the inlet are set in the superconduction magnetic separator
Distinguish internally positioned metal link network both sides with overfall, mud discharging mouth is located at Magneto separate tank base, wherein, the overfall difference
It is connected with collecting tank and mixing pit, mud discharging mouth is connected by sludge pump with mudpan, the horn mouth one is malleation, separately
One is negative pressure.
Sludge pump is equipped with pipeline between the mudpan entrance point and superconduction magnetic separator mud discharging mouth end；The sludge
Sedimentation basin overfall is connected with tank, and the base sludge in the mudpan is delivered to sludge dewatering through sludge pump P7
Machine；The sludge dewatering equipment is plate and frame filter press, and the plate and frame filter press mud discharging mouth is connected with storage mud groove, the plate and frame filter press
Leakage fluid dram is connected with tank.
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