CN103785677B - Heavy-metal contaminated soil reparation and leacheate recycle integrated apparatus and method thereof - Google Patents
Heavy-metal contaminated soil reparation and leacheate recycle integrated apparatus and method thereof Download PDFInfo
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- CN103785677B CN103785677B CN201410036702.5A CN201410036702A CN103785677B CN 103785677 B CN103785677 B CN 103785677B CN 201410036702 A CN201410036702 A CN 201410036702A CN 103785677 B CN103785677 B CN 103785677B
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Abstract
The present invention recycles integrated apparatus for a kind of heavy-metal contaminated soil reparation and leacheate, it is sequentially connected with the eluting column of cyclization, sedimentation tank, suction pump, electrochemical reactor, circulating pump, the first fluid reservoir including by connecting pipe, this device can effectively remove heavy metal in soil, leacheate can recycle after electrochemical treatments, and remediation efficiency is high, and operating cost is low, apparatus structure is simple, the suitability is strong, and noiseless is taken up an area little；The invention also discloses corresponding method, including circulating looped Soil leaching, precipitation, electrochemical processing step, the method can effectively remove the heavy metal in contaminated soil, drip washing number of times is few, and leacheate is high through electrochemical treatments Posterior circle elution efficiency, not only avoid secondary pollution, and avoid the post processing of leacheate, processing cost reduces, and method is simple, and process is easily controllable.The present invention is applicable to the reparation of heavy-metal contaminated soil, and the recycling of ring waste.
Description
Technical field
The invention belongs to heavy-metal contaminated soil and repair field, relate to a kind of soil remediation and dress that leacheate recycles
Putting and method, specifically a kind of heavy-metal contaminated soil reparation and leacheate recycle integrated apparatus and side thereof
Method.
Background technology
Along with the development of society, flourishing industry and Agricultural Activities cause the heavy metal pollution in environment more and more tighter
Weight.Due to disguise, refractory organics and the irreversibility of heavy metal, large area soil is not only made to use, but also meeting
Jeopardized the life and health of the mankind by food chain relation, also can directly influence function and the structure of soil ecosystem,
Eventually biological and ecological is threatened safely.Therefore, reparation and the improvement of heavy-metal contaminated soil becomes environment urgently to be resolved hurrily and asks
Topic.
The restorative procedure that heavy metal is polluted at present mainly includes peripheral doses, phytoremediation, microorganism remediation and chemistry
Repair.In first three methods, peripheral doses is wasted time and energy, cannot fundamentally be reduced pollutant levels；Phytoremediation super enrichment
Plant treatment amount is little, plant lack, inconspicuous to Compound Heavy Metals removal effect；Microorganism remediation repaired area is little, training
Educate the shortcomings such as difficulty, fail to be promoted the use of by large-area.Soil washing (soil flushing/soil washing) is
The one of chemical redemption, be use physically or chemically means to carry out the organic and inorganic pollution in contaminated soil separating, every
From, concentrate or carry out the process of harmless treatment, there is the advantages such as repair time is short, efficiency is high, non-secondary pollution.
Eluent is the key of Soil leaching, and conventional eluent is divided into three major types, be respectively inorganic eluent (water, acid,
Alkali, salt), chelating agen (weak organic acid, artificial chelating agen etc.), biosurfactant (rhamnolipid) etc..Inorganic eluent meeting
Cause the acidifying of soil, alkalization or salinization of soil, destroy physicochemical property and the ecological environment of soil, bring secondary pollution simultaneously；Weak
Although organic acid can biodegradation, non-secondary pollution, but be directed to the improvement of slight pollution soil；Though surfactant is right
Heavy metals removal is effective, but at present still in conceptual phase.EDTA is the one of artificial chelating agen, self has relatively large
Molecular weight, it is possible to rely on chelation, and heavy metal chelate, form different chelates, its structure comparison stably, it
Can not only desorbing by the metal of adsorption by soil, also can dissolve insoluble metallic compound, under large-scale pH with transition gold
Belonging to and form stable compound, the heavy-metal contaminated soil for various concentration has good removal effect, but leacheate is very
Difficult for biological degradation, easily causes secondary pollution.For ring waste, generally processed by Physical, bioanalysis or chemical method:
Physical is mainly activated carbon adsorption, the method that film processes, and has regeneration difficulty, invests big shortcoming；Bioanalysis mainly profit
Adsorbing with microorganism or plant, adsorbance is little, and the plant of super enrichment or microorganism lack, and cultivate the shortcomings such as difficulty；Change
Method is reacted formation precipitation etc. mainly by chemical reagent and ring waste and is processed, and treatment effeciency is low, and heavy metal can not
Recycle.
Notification number is the Chinese invention patent of CN 102240666 B, discloses " a kind of heavy metal polluted soil drip washing reparation
Device ", in this invention, heavy metal polluted soil drip washing prosthetic device uses bicirculating structure, and leacheate recycles, and repetition is many
Secondary drip washing both can improve Polluted Soil remediation efficiency, turn avoid raising and the wave of leacheate polluting leacheate post processing cost
Taking, water-bath circulating-heating, Polluted Soil constant temperature thermally equivalent, drip washing post heat-insulation layer reduces drip washing amount of heat and scatters and disappears, and eliminates heat
The lost impact on heats of amount.Water-bath circulating-heating and bottom liquid inlet, to Polluted Soil drip washing, can improve a huge sum of money in Polluted Soil
The removal efficiency belonged to.But, after the method often carries out once washing, washing liquid contains heavy metal, due to the weight in circulation washing lotion
Metal concentration constantly accumulates, and circulation fluid washing is used for multiple times to reducing the heavy metal of residual in soil and there is no obvious effect, circulation
Elution efficiency is low, and final washing liquid can not recycle because heavy metal concentration is excessive, if waste liquid does not process will cause secondary pollution.
Summary of the invention
The technical problem to be solved in the present invention, is to provide a kind of heavy-metal contaminated soil reparation and leacheate recycles one
Body gasifying device, this device can effectively remove the heavy metal of soil middle and high concentration, and leacheate can circulate after electrochemical treatments
Utilizing, the efficiency of reparation is high, and operating cost is low, and device is simple, takes up an area little.
Another object of the present invention, is to provide a kind of heavy-metal contaminated soil reparation and side that leacheate recycles
Method, it is possible to effectively removing the heavy metal in heavy-metal contaminated soil, drip washing number of times is few, efficiency is high, and leacheate can recycle,
Avoid secondary pollution, reduce processing cost.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of heavy-metal contaminated soil reparation and leacheate recycle integrated apparatus, including by connecting pipe successively
Connect looped eluting column, sedimentation tank, suction pump, electrochemical reactor, circulating pump, the first fluid reservoir；Described drip washing tower top
Portion is provided with the first inlet, is fixed on the shower nozzle at top, is provided with the baffle plate of perforate, funnel bottom eluting column；Described electrochemistry
Reactor bottom is provided with air distribution plate, aerator and the second inlet, be provided with on the left of electrochemical reactor upper wall the 3rd inlet,
Right side wall top is provided with air vent, left side wall is provided with leakage fluid dram, is respectively equipped with anode electrode plate and the moon inside electrochemical reactor
Pole battery lead plate plate；Described anode electrode plate and the two ends of cathode electrode plate respectively with electrochemical reactor inner upper wall face, cloth
Aerofoil is connected, and fills graphite granule, anode electrode plate and cathode electrode plate by leading between anode electrode plate and cathode electrode plate
Line is connected with DC source respectively.
As a kind of restriction of the present invention, in described eluting column, packed height is the heavy metal of the 2/3 of eluting column height
Contaminated soil, heavy-metal contaminated soil is equipped with 300 purpose the first gauze layers, and the first gauze layer is pouring overlaid with height
Wash tower height degree 1/10 cobblestone layer.
As the another kind of restriction of the present invention, described baffle plate is provided with the circular hole of some a diameter of 5mm, and baffle plate upper surface spreads
It is provided with 300 purpose the second gauze layers.
The third as the present invention limits, and is provided with and contains the second of Fenton reagent outside described electrochemical reactor
Fluid reservoir.
As the 4th kind of restriction of the present invention, between described anode electrode plate and cathode electrode plate, it is provided with ion exchange
Film, the two ends of ion exchange membrane are connected with electrochemical reactor inner upper wall face, air distribution plate respectively.
Present invention also offers a kind of heavy-metal contaminated soil reparation and method that leacheate recycles, through institute of the present invention
The heavy-metal contaminated soil reparation stated and leacheate recycle integrated apparatus and realize, and it enters according to steps order
OK:
1. in eluting column, heavy-metal contaminated soil through PH be 3-5, concentration be the EDTA solution of 0.01-0.1mol/L
Drip washing after, obtain liquid A at the bottom of tower；
2., after liquid A precipitates 10min in sedimentation tank, supernatant liquid B is obtained；
3., during liquid B squeezes into the electrochemical reactor filling 0.01mol/L metabisulfite solution by suction pump, second is opened
The knob of fluid reservoir, makes Fenton reagent flow in electrochemical reactor, and the flow of Fenton reagent is 5-10ml/min, electrolysis
Time is 6h, obtains liquid C；
4. liquid C squeezes in the first fluid reservoir by circulating pump, and PH and the concentration of EDTA solution are adjusted to initial value；
Circulate the most next time, i.e. repeat step the most 4.；Until completing to circulate at least twice, it is achieved soil remediation.
As a kind of restriction of the inventive method, Fe in described Fenton reagent2+With H2O2Mol ratio be 1:2-
2.5。
As the another kind of restriction of the inventive method, the described liquid-solid ratio in eluting column is 20.
The method of the present invention also has one to limit, and described heavy-metal contaminated soil, after 5-8 time circulates, completes soil
Repair.
The method that the heavy-metal contaminated soil reparation of the present invention and leacheate recycle is as an entirety, it is possible to effectively
Removing the heavy metal in heavy-metal contaminated soil, drip washing number of times is few, and leacheate can recycle, it is to avoid secondary pollution, side
Method is simple, and process is easily controllable, and processing cost is low.
In eluting column, heavy metal contaminated soil is repaired, by leacheate and the heavy metal chelating in contaminated soil,
Reach the purpose of removing heavy metals.Leacheate takes the mode heavy metal contaminated soil of spray to carry out drip washing, paving in eluting column
If after cobblestone layer and the first gauze layer, increase soil and the time of contact of leacheate, make Soil leaching more uniform, heavy metal
Removal effect is more preferably.
Waste liquid after drip washing can be converted into EDTA and heavy metal by electrochemical reactor, on the one hand, can remove back
Receiving the heavy metal in waste liquid, on the other hand, the waste liquid after process is converted into EDTA solution, permissible after overregulating concentration and pH value
Again recycle.Using Fenton reagent to combine three-diemsnional electrode in processing procedure to complete to react accordingly, Fenton reagent is
By H2O2And Fe2+The acidic mixture of composition, has stronger oxidisability, there are following two reactions in solution:
After adding Fenton reagent in electrochemical reactor, the OH in Fenton reagent has strong oxidizing property, can decompose
EDTA-heavy metal chelate in ring waste, the solution after decomposition becomes EDTA solution and heavy metal ion, heavy metal ion
Discharging on the minus plate of electrochemical reactor, heavy metal ion is changed into heavy metal deposition near negative electrode, thus reaches
The effect of removing heavy metals.Using three-diemsnional electrode in electrolytic process, it can increase the face body ratio of electrolysis bath, improve current efficiency and
Disposal ability, is also easy to realize continuous operation, can operate, additionally do not use in electrolytic process under different electric current densities
Or small amount uses chemical drugs, post processing is simple, and floor space is little, and disposal ability is big, and convenient management etc., it can overcome originally
The shortcomings such as the unit cell body treating capacity that two-dimensional electrode exists is little, current efficiency is low, add the electrode surface area of unit sump volume,
Increasing material translational speed, therefore, the treating capacity of unit sump volume increases, and can be effectively improved the electrolysis of the low treatment fluid of electrical conductivity
Efficiency.
Owing to have employed above-mentioned technical scheme, compared with prior art, acquired technological progress is the present invention:
Heavy-metal contaminated soil reparation provided by the present invention and leacheate recycle integrated apparatus, can effectively remove
Heavy metal in soil, leacheate can recycle after electrochemical treatments, and the efficiency of reparation is high, and operating cost is low, device
Simple in construction, the suitability is strong, and noiseless is taken up an area little.
The method that heavy-metal contaminated soil reparation provided by the present invention and leacheate recycle, including Soil leaching,
Precipitation, electrochemical processing step, the method can effectively remove the heavy metal in heavy-metal contaminated soil, and drip washing number of times is few, repaiies
The multiple cycle is short, and leacheate is high through the efficiency of electrochemical treatments Posterior circle drip washing, not only avoid secondary pollution, and avoids
The post processing of leacheate, processing cost reduces, and method is simple, and process is easily controllable.
The heavy-metal contaminated soil reparation of the present invention and leacheate recycle integrated apparatus apply and repair accordingly
In compound recipe method, can effectively remove the heavy metal of soil middle and high concentration, after cycling elution 8 times, Pb, Cu, Zn, Cd in contaminated soil
Clearance is respectively 87.31%, 78.96%, 72.45% and 89.26%, and the efficiency of reparation is high, drip washing number of times is few, and leacheate passes through
The efficiency of electrochemical treatments Posterior circle drip washing is high, not only avoid secondary pollution, and avoids the post processing of leacheate, processes
Cost reduces, and method is simple, and process is easily controllable, and operating cost is low, and apparatus structure is simple, it is easy to safeguard, the suitability is strong, without making an uproar
Sound, takes up an area little.
The present invention is applicable to repairing and the process of corresponding ring waste of heavy-metal contaminated soil.
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the structural representation of eluting column 1 in embodiment illustrated in fig. 1.
Fig. 3 is the structural representation of electrochemical reactor 4 in embodiment illustrated in fig. 1.
In figure: 1-eluting column, 2-sedimentation tank, 3-suction pump, 4-electrochemical reactor, 5-circulating pump, 6-the first fluid reservoir,
7-the second fluid reservoir, 8-aerator, 11-shower nozzle, 12-cobblestone layer, 13-the first gauze layer, 14-heavy-metal contaminated soil,
15-baffle plate, 16-funnel, 17-the first inlet, 18-the second gauze layer, 40-the 3rd inlet, 41-anode electrode plate, 42-is cloudy
Pole battery lead plate, 43-graphite granule, 44-ion exchange membrane, 45-steam vent, 46-DC source, 47-the second inlet, 48-cloth
Aerofoil, 49-leakage fluid dram, A1-the first valve, A2-the second valve, A3-the 3rd valve, A4-the 4th valve, A5-the 5th valve,
A6-the 6th valve.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention is further illustrated.
1 one kinds of heavy-metal contaminated soil reparations of embodiment and leacheate recycle integrated apparatus
As it is shown in figure 1, the present embodiment recycles integrated apparatus for a kind of heavy-metal contaminated soil reparation and leacheate,
Including be sequentially connected with by connecting pipe the eluting column 1 of cyclization, sedimentation tank 2, suction pump 3, electrochemical reactor 4, circulating pump 5,
First fluid reservoir 6, electrochemical reactor 4 is outside is provided with the second fluid reservoir 7.
As in figure 2 it is shown, eluting column 1 includes the first inlet 17, shower nozzle 11, baffle plate the 15, first gauze layer the 13, second gauze
Layer 18, cobblestone layer 12, heavy-metal contaminated soil 14, funnel 16.The top of eluting column 1 is provided with by connecting pipeline and the first storage
The first inlet 17 that flow container 6 is connected, is spaced by multiple shower nozzles 11 that flexible pipe is connected with the first inlet and is fixed on pouring
Washing the top of tower 1, in eluting column 1, packed height is the heavy-metal contaminated soil 14 of the 2/3 of eluting column 1 height, heavy metal pollution
Being equipped with one layer of 300 purpose the first gauze layer 13 on soil 14, the first gauze layer 13 is eluting column 1 height overlaid with height
1/10 cobblestone layer 12, the baffle plate 15 of the circular hole being provided with multiple a diameter of 5mm be fixed on eluting column 1 bottom interior wall and along
The inwall direction of eluting column 1 extends, and baffle plate 15 upper surface is equipped with 300 purpose the second gauze layers 18, funnel 16 and baffle plate 15
Lower surface is fixing to be connected.
Sedimentation tank 2 one end is connected by pipeline with the funnel 16 bottom eluting column 1 by connecting pipeline, funnel 16 and precipitation
The 6th valve A6 it is provided with between pond 2.
One end of suction pump 3 is connected with sedimentation tank 2 by pipeline, is provided with the 5th valve between suction pump 3 and sedimentation tank 2
A5。
Electrochemical reactor 4 comprise the 3rd inlet 40, anode electrode plate 41, cathode electrode plate 42, graphite granule 43, from
Proton exchange 44, air vent 45, DC source the 46, second inlet 47, air distribution plate 48, leakage fluid dram 49, aerator 8.Cloth wind
Plate 48 is fixed on the bottom of electrochemical reactor, and the length and width of air distribution plate 48 is respectively less than the length and width of electrochemical reaction room, electricity
Second inlet 47 of chemical reactor 4 bottom left is connected with suction pump 3 by pipeline, the second inlet 47 and suction pump 3
Between be provided with the second valve A2, be located at the 3rd inlet 40 on the right side of electrochemical reactor 4 upper wall by pipeline and the second liquid storage
Tank 7 is connected, and aerator 8 is located on the right side of the diapire of electrochemical reactor 4, and air vent 45 is located on the right wall of electrochemical reactor 4
Side, electrochemical reactor 4 left wall is provided with the leakage fluid dram 49 being connected by pipeline with circulating pump 5, between leakage fluid dram 49 and circulating pump 5
It is provided with the 4th valve A4, in electrochemical reactor 4, is respectively provided with anode electrode plate 41 and cathode electrode plate 42, anode electrode plate 41
Being fixed on electrochemical reactor 4 inner upper wall face with cathode electrode plate 42 one end, the other end is fixed on air distribution plate 48, is located at anode
The inner upper wall of electrochemical reactor 4 is fixed in ion exchange membrane 44 one end between battery lead plate 41 and cathode electrode plate 42, separately
Air distribution plate 48 is fixed in one end, and the width of ion exchange membrane 44 is less than the width of electrochemical reactor 4, anode electrode plate 41 and the moon
Fill between pole battery lead plate 42 graphite granule 43, anode electrode plate 41 and cathode electrode plate 42 by wire respectively with external dc
Power supply 46 is connected, and fills metabisulfite solution in electrochemical reactor 4.
It is provided with the 3rd valve A3, the second fluid reservoir between second fluid reservoir 7 and the 3rd inlet 40 of electrochemical reactor 4
7 are placed on the support higher than electrochemical reactor 4 liquid level.
One end of circulating pump 5 is connected with the leakage fluid dram 49 of electrochemical reactor 4 by pipeline, circulating pump 5 and leakage fluid dram 49
Between be provided with the 4th valve A4.
One end of first fluid reservoir 6 is connected by pipeline with circulating pump 5, the other end and the first inlet 17 of eluting column 1
Being connected by pipeline, be provided with the first valve A1 between the first fluid reservoir 6 and the first inlet 17, the first fluid reservoir 6 is placed on height
On the support of eluting column 1 height.
When opening the first valve A1, after regulation flow, the EDTA solution in the first fluid reservoir 6 flows into spray column by pipeline
First inlet 17 of 1, the EDTA solution in the first inlet 17 is sprayed by the shower nozzle 11 being connected with flexible pipe, and liquid is through goose
After boulder bed the 12, first gauze layer 13, contaminated soil the 14, second gauze layer 18, baffle plate 15, flow out from funnel 16, open the
Six valve A6, after the solution flowed out enters sedimentation tank 2 precipitation by pipeline, open the 5th valve A5, suction pump 3 and in funnel 16
Second valve A2, sedimentation tank 2 liquid at the middle and upper levels is pumped down in electrochemical reactor 4, close the second valve A2, suction pump 3,
Five valve A5, open the 3rd valve A3, and after regulation flow, in the second fluid reservoir 7, Fenton reagent flows from the 3rd inlet 40
Enter, under the effect of Fenton reagent and electrochemistry, the chelate of EDTA-heavy metal be decomposed into EDTA solution and heavy metal from
Son, heavy metal ion discharges near minus plate and is reduced to heavy metal simple substance, and anodic product oxygen is drained from air vent 45, electricity
Solution preocess aeration maintains always, after 6h to be electrolysed, closes the 3rd valve A3, opens the 4th valve A4, circulating pump 5, after electrolysis
Solution is evacuated in the first fluid reservoir 6 by pipeline, and the EDTA solution in the first fluid reservoir 6 is adjusted PH and concentration is preliminary examination value
After, again recycle.
Heavy-metal contaminated soil reparation and leacheate that embodiment 1 provides recycle integrated apparatus and can effectively remove soil
Heavy metal in earth, leacheate can recycle after electrochemical treatments, and the efficiency of reparation is high, and operating cost is low, device
Simple in construction, it is easy to safeguard, the suitability is strong, and noiseless is taken up an area little.
The method that 2 one kinds of heavy-metal contaminated soil reparations of embodiment and leacheate recycle
The method that the present embodiment is heavy metal pollution soil remediation and leacheate recycles, relies on described in embodiment 1
Integrated apparatus realizes, and carries out according to steps order:
1. in eluting column, heavy-metal contaminated soil through PH be 3, concentration be the drip washing of EDTA solution of 0.01mol/L,
Liquid-solid ratio in eluting column is 20, obtains liquid A at the bottom of tower；
2., after liquid A precipitates 10min in sedimentation tank, upper strata obtains liquid B；
3., during liquid B squeezes into the electrochemical reactor of the metabisulfite solution filling 0.01mol/L by suction pump, is opened
Two fluid reservoir valves, flow into Fe2+With H2O2The Fenton reagent that mol ratio is 1:2, Fenton reagent flow is 5ml/min,
The time of electrolysis is 6h, obtains liquid C；
4. liquid C squeezes in the first fluid reservoir by circulating pump, after the PH of regulation EDTA solution and concentration are initial value, enters
Row circulates next time；
5. repeat step the most 4. seven times, after i.e. completing cycling elution 8 times, obtain the soil after reparation.
After the present embodiment heavy metal contaminated soil processes, heavy metal removing rate is high, and the efficiency of reparation is high, drip washing number of times
Few, leacheate is high through the efficiency of electrochemical treatments Posterior circle drip washing, not only avoid secondary pollution, and avoids leacheate
Post processing, processing cost reduces, and method is simple, and process is easily controllable.
The method that the heavy-metal contaminated soil reparation of embodiment 3-6 and leacheate recycle
A kind of method that embodiment 3-6 is respectively heavy-metal contaminated soil reparation and leacheate recycles, dress used
Put same as in Example 1, method that in each embodiment, heavy-metal contaminated soil reparation and leacheate recycle, heavy metal pollution
Soil is similar to Example 2, and difference is as shown in table 1, is in repair process that relevant control parameter is different.
The method that table 1 heavy-metal contaminated soil reparation and leacheate recycle controls parameter accordingly
As seen from the above table, after embodiment 3-6 heavy metal contaminated soil processes, heavy metal removing rate is high, the efficiency of reparation
Height, drip washing number of times are few, and leacheate is high through the efficiency of electrochemical treatments Posterior circle drip washing, not only avoid secondary pollution, and
Avoiding the post processing of leacheate, processing cost reduces, and method is simple, and process is easily controllable.
Embodiment 7 heavy-metal contaminated soil reparation and leacheate recycle the process effect of integrated apparatus and method thereof
Really
The clearance of heavy metal main in heavy-metal contaminated soil after embodiment 2 reparation is detected by embodiment 7,
Result is as shown in table 2.
Data synopsis before and after the reparation of table 2 heavy-metal contaminated soil
As seen from the above table, heavy-metal contaminated soil through 8 EDTA washing liquid drip washing repair after, the heavy metal concentration in soil
Substantially reduce, the soil after process meet standard of soil environment quality value (1995) primary standard (Cd≤0.2mg/kg, Cu≤
35mg/kg, Pb≤35mg/kg, Zn≤100mg/kg), in contaminated soil the clearance of Pb, Cu, Zn, Cd be respectively 87.31%,
78.96%, 72.45% and 89.26%, repairing efficiency is short, and the removal efficiency of heavy metal is high.
Embodiment 1-6, is only presently preferred embodiments of the present invention, is not the limit of other form made for the present invention
Fixed, any those skilled in the art are changed or are modified as equivalent change possibly also with above-mentioned technology contents as enlightening
The Equivalent embodiments changed.In every case it is the technical spirit without departing from the claims in the present invention, simple to done by above example
Amendment, equivalent variations and remodeling, still fall within the scope of the claims in the present invention protection.
Claims (8)
1. a heavy-metal contaminated soil reparation and leacheate recycle integrated apparatus, it is characterised in that: include by even
Thread a pipe be sequentially connected with the eluting column (1) of cyclization, sedimentation tank (2), suction pump (3), electrochemical reactor (4), circulating pump (5),
First fluid reservoir (6)；Described eluting column (1) top is provided with the first inlet (17), is fixed on the shower nozzle (11) at top, drip washing
Tower (1) bottom is provided with the baffle plate (15) of perforate, funnel (16)；Described electrochemical reactor (4) bottom be provided with air distribution plate (48),
Aerator (8) and the second inlet (47), be provided with the 3rd inlet (40), right side wall on the left of electrochemical reactor (4) upper wall
Top is provided with air vent (45), left side wall is provided with leakage fluid dram (49), and electrochemical reactor (4) is internal is respectively equipped with anode electrode plate
And cathode electrode plate (42) (41)；Described anode electrode plate (41) and the two ends of cathode electrode plate (42) are anti-with electrochemistry respectively
Answer device (4) inner upper wall face, air distribution plate (48) to be connected, between anode electrode plate (41) and cathode electrode plate (42), fill graphite
Grain (43), anode electrode plate (41) and cathode electrode plate (42) are connected with DC source (46) respectively by wire.
Heavy-metal contaminated soil reparation the most according to claim 1 and leacheate recycle integrated apparatus, its feature
It is: described eluting column (1) interior packed height is the heavy-metal contaminated soil (14) of the 2/3 of eluting column (1) height, heavy metal
Being equipped with 300 purposes the first gauze layer (13) on contaminated soil (14), the first gauze layer (13) is drip washing overlaid with height
The cobblestone layer (12) of the 1/10 of tower (1) height.
Heavy-metal contaminated soil reparation the most according to claim 1 and leacheate recycle integrated apparatus, its feature
It is: described baffle plate (15) is provided with the circular hole of some a diameter of 5mm, and baffle plate (15) upper surface is equipped with 300 purpose the second yarns
Layer of cloth (18).
Heavy-metal contaminated soil reparation the most according to claim 1 and leacheate recycle integrated apparatus, its feature
It is: described electrochemical reactor (4) is outside is provided with the second fluid reservoir (7) containing Fenton reagent.
Heavy-metal contaminated soil reparation the most according to claim 1 and leacheate recycle integrated apparatus, its feature
It is: between described anode electrode plate (41) and cathode electrode plate (42), be provided with ion exchange membrane (44), ion exchange membrane
(44) two ends are connected with electrochemical reactor (4) inner upper wall face, air distribution plate (48) respectively.
6. the method that a heavy-metal contaminated soil reparation and leacheate recycle, it is characterised in that: institute in claim 4
The heavy-metal contaminated soil reparation stated and leacheate recycle integrated apparatus and realize, and it enters according to steps order
OK:
1. in eluting column, heavy-metal contaminated soil through PH be 3-5, concentration be the pouring of EDTA solution of 0.01-0.1mol/L
After washing, at the bottom of tower, obtain liquid A；
2., after liquid A precipitates 10min in sedimentation tank, supernatant liquid B is obtained；
3., during liquid B squeezes into the electrochemical reactor filling 0.01mol/L metabisulfite solution by suction pump, the second liquid storage is opened
The knob of tank, makes Fenton reagent flow in electrochemical reactor, and the flow of Fenton reagent is 5-10ml/min, electrolysis time
For 6h, obtain liquid C；
Fe in described Fenton reagent2+With H2O2Mol ratio be 1:2-2.5；
4. liquid C squeezes in the first fluid reservoir by circulating pump, and PH and the concentration of EDTA solution are adjusted to initial value；
Circulate the most next time, i.e. repeat step the most 4.；Until completing to circulate at least twice, it is achieved soil remediation.
The method that heavy-metal contaminated soil reparation the most according to claim 6 and leacheate recycle, it is characterised in that:
The described liquid-solid ratio in eluting column is 20.
8. the method recycled according to the heavy-metal contaminated soil reparation described in claim 6 or 7 and leacheate, its feature
It is: described heavy-metal contaminated soil, after 5-8 time circulates, completes soil remediation.
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| CN104259192B (en) * | 2014-09-24 | 2016-03-02 | 长江水利委员会长江科学院 | A kind of Ecological waterscape repair system of heavy metal pollution agricultural land soil and method |
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