CN104858225B - A kind of electronic combined remediation method of the elution of heavy-metal contaminated soil - Google Patents
A kind of electronic combined remediation method of the elution of heavy-metal contaminated soil Download PDFInfo
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- CN104858225B CN104858225B CN201510298674.9A CN201510298674A CN104858225B CN 104858225 B CN104858225 B CN 104858225B CN 201510298674 A CN201510298674 A CN 201510298674A CN 104858225 B CN104858225 B CN 104858225B
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Abstract
The invention discloses a kind of electronic joint prosthetic device of elution of heavy-metal contaminated soil and method, described device includes elution circuit and electro reclamation system；In described elution circuit, elution liquid storage tank, acid storage tank, alkali storage tank are connected by first, second, and third peristaltic pump with contaminated soil storage tank respectively；Contaminated soil storage tank is internally provided with mixer；In described electro reclamation system, electro reclamation room both sides are respectively equipped with anode chamber and cathode chamber；Agitating device is respectively arranged with anode chamber and cathode chamber；The negative electrode of dc source is connected with the cathode electrode being placed in cathode chamber, and the anode of dc source is connected with the anode electrode being placed in anode chamber；Anode liquid storage tank is connected by the 4th and the 5th peristaltic pump with anode chamber, forms loop；Negative electrode liquid storage tank is connected by the six, the 7th peristaltic pumps with cathode chamber, forms loop；Contaminated soil reservoir bottom in elution circuit is connected by slush pump with electro reclamation room.
Description
Technical field
The invention belongs to environmental protection technical field, more particularly to a kind of elution of heavy-metal contaminated soil is electronic to combine and repaiies
Apparatus for coating and method.
Background technology
Soil is basic necessities of life for the survival of mankind sheet.With society and industrial development, soil environment is just by serious dirt
Dye, including heavy metal pollution, organic contamination and other pollutions.2014, Environmental Protection Department combined issue with Ministry of Land and Resources
《National Soil Pollution Investigation publication》Display China soil environment situation totally allows of no optimist, some areas soil pollution compared with
Weight, the most serious is heavy metal pollution, and organic contamination is taken second place.There is disguise, cumulative bad, region in soil in heavy metal
Property, chronicity, can not degrade, cause the characteristics such as underground water pollution, it is serious to threaten health and ecological environment security；It is repaired
Improvement at home and abroad causes great attention, while the hot subject as Research of Environmental Sciences field.
Current remediation of heavy metal-contaminated soil mainly has curing/stabilizing, chemical leaching, phytoremediation, electronic repaiied
It is multiple etc..There are pros and cons in these methods, single method is often inefficient on actual repair engineer applied, it is difficult to reach reparation
Target.Heavy-metal contaminated soil reparation is a systematic engineering of business, is development trend and the research of soil remediation using combination technique
Focus.
Heavy metal in soil is transferred in liquid phase by soil chemistry elution recovery technique using leacheate, contains elution
The soil of liquid gives back recycling in situ after being washed through clear water, the waste liquid rich in heavy metal is then further processed.Elution method
With can remove substantial amounts of pollutant in soil, limit the diffusion of noxious pollutant, invest and consume relatively fewer, operator
The advantages of member is without direct contact stain thing.The technology has at home and abroad obtained in contaminated site recovery project extensively should
With its key is the selection of leacheate, it is desirable to heavy metal can be extracted and the structure of soil is not destroyed, and if dealing with improperly residual
The leacheate stayed can more be likely to cause secondary pollution.
The electrophoresis that electric repairing technique is arrived originating from Reuss first observeds in 1809 earliest.The technology is in 20th century
The nineties is widely studied；It mainly by applying DC electric field potential gradient in contaminated soil both sides, makes the dirt in soil
Dye thing is moved to electrode tip under electric field action by modes such as electromigration, electrodialysis, electrophoresis, so as to reach cleaning contaminated soil
Effect.Electric repairing technique is applied to viscosity, sand loam soil, and EOF can still be produced in hypotonicity soil,
Suitable for the repairing and treating of a variety of soil types.But there is pH value change and have a strong impact on repairing effect in current electric repairing technique
This problem.How the acid migration to being produced in repair process, with effectively being controlled or being eliminated its influence brought, is found
The means that effectively heavy metal can be parsed from soil, it has also become the key factor of influence soil electro reclamation effect.
The content of the invention
There is provided a kind of pollution of heavy metal for advantage and deficiency of the invention for two kinds of technologies of chemical leaching and electro reclamation
The joint prosthetic device of soil non-secondary pollution, can effectively improve heavy metal removing rate, improve remediation efficiency, reduction energy consumption.
The technical problem of the invention also to be solved is to provide the elution electricity that heavy-metal contaminated soil is carried out using said apparatus
Dynamic combined remediation method.
In order to solve the above technical problems, the technical solution adopted by the present invention is as follows：
A kind of electronic joint prosthetic device of the elution of heavy-metal contaminated soil, it includes as follows：Elution circuit and electronic repair
Complex system；
Described elution circuit includes elution liquid storage tank, the first peristaltic pump, mixer, acid storage tank, the second peristaltic pump, alkali storage
Tank, the 3rd peristaltic pump and contaminated soil storage tank；Wherein, elution liquid storage tank, acid storage tank, alkali storage tank respectively by the first peristaltic pump,
Second peristaltic pump and the 3rd peristaltic pump are connected with contaminated soil storage tank；Contaminated soil storage tank is internally provided with mixer；
Described electro reclamation system includes anode electrode, cathode electrode, anode liquid storage tank, the 4th peristaltic pump, stirring dress
Put, anode chamber, cathode chamber, electro reclamation room, dc source, the 5th peristaltic pump, the 6th peristaltic pump, negative electrode liquid storage tank and the 7th compacted
Dynamic pump；Wherein, electro reclamation room side is separated with anode chamber by non-woven fabrics, and opposite side is separated with cathode chamber, anode by non-woven fabrics
Room and cathode chamber are not contacted；Agitating device is respectively arranged with anode chamber and cathode chamber；The negative electrode and cathode electrode of dc source
It is connected, cathode electrode is placed in cathode chamber, and the anode of dc source is connected with anode electrode, and anode electrode is placed in anode chamber；
Anode liquid storage tank is connected by the 4th peristaltic pump with anode chamber, and anode chamber is connected by the 5th peristaltic pump with anode liquid storage tank, shape
Its mouth of pipe of part and liquid level of electrolyte being located at into the pipeline where loop, and the 5th peristaltic pump in anode chamber are tangent；Catholyte
Storage tank is connected by the 7th peristaltic pump with cathode chamber, and cathode chamber is connected by the 6th peristaltic pump with negative electrode liquid storage tank, is formed back
Its mouth of pipe of part and liquid level of electrolyte that pipeline where road, and the 6th peristaltic pump is located in cathode chamber are tangent；
Contaminated soil reservoir bottom in elution circuit is connected by slush pump with electro reclamation room.
The method that the electronic joint of elution for carrying out heavy-metal contaminated soil using said apparatus is repaired, this method includes as follows
Step：
(a) heavy-metal contaminated soil is placed in contaminated soil storage tank, distinguished by the second peristaltic pump or the 3rd peristaltic pump
Acid solution in acid storage tank or alkali storage tank or alkali lye are added in contaminated soil storage tank, mixer is opened and persistently stirs, make Polluted Soil
Soil pH in earth storage tank is uniform；
(b) leacheate eluted in liquid storage tank is added in contaminated soil storage tank by the first peristaltic pump, is kept stirring for machine
Lasting stirring, makes the soil in contaminated soil storage tank fully be mixed with leacheate, it is ensured that heavy metal components are fully anti-with leacheate
The forms such as complex compound should be generated；
(c) soil in contaminated soil storage tank is transferred to by electro reclamation room by slush pump；
(d) after the soil in electro reclamation room is stood, dc source is connected, electricity is formed between anode electrode and cathode electrode
Potential gradient；
(e) it is synchronous to open the 4th peristaltic pump and the 5th peristaltic pump, to keep liquid level of electrolyte height and the electricity in anode chamber
Solve liquid concentration；It is synchronous to open the 6th peristaltic pump and the 7th peristaltic pump, to keep liquid level of electrolyte height and the electrolysis in cathode chamber
Liquid concentration；
(f) during electro reclamation, it is kept stirring for device continuous running, it is ensured that the homogeneity of electrolyte solution.
Described heavy metal pollution is Cd pollutions, Ni pollutions, Pb pollutions or Zn pollutions.
In step (a), the acid solution that described acid storage tank is built-in with is HNO3The aqueous solution, the alkali that described alkali storage tank is built-in with
Liquid is the NaOH aqueous solution or the KOH aqueous solution.
In step (a), make the soil pH in contaminated soil storage tank uniform and between pH2~5.
In step (b), described leacheate is 0.1~1mol/L disodium ethylene diamine tetra-acetic acid aqueous solutions, 0.1~1mol/L
Sodium citrate aqueous solution or 0.1~1mol/L acetic acid aqueous solutions.
In step (b), rubbed according to solute in the heavy metal element and leacheate in soil pollution in contaminated soil storage tank
You elute the addition of the leacheate in liquid storage tank than being calculated for 1: 1.1~1.2
In step (d), described dc source, potential gradient is 0.1~5V/cm, anode electrode and cathode electrode material
For graphite electrode plate or carbon felt electrode plate.
In step (e), the electrolyte in anode chamber and anode liquid storage tank is 0.01~1mol/L NaNO3The aqueous solution or
0.01~1mol/LKNO3The aqueous solution；Catholyte in cathode chamber and negative electrode liquid storage tank is 0.01~0.5mol/LpH 2
~4 acetic acid-sodium acetate buffer solution.
The inventive method, it is general to take within every 6 hours pedotheque to carry out analysis detection from electro reclamation room, when heavy metal is dense
When degree remains above reparation desired value, proceed electro reclamation；During less than or equal to repairing desired value, stop electro reclamation.Electricity is repaiied
After multiple junction beam, soil is kept in and waits to check and accept.
Beneficial effect：The present invention has following advantage relative to prior art：
(1) after using said apparatus and method, on the basis of using heavy-metal contaminated soil chemical leaching device, for
Separating for heavy metal pollution component of soil progress is removed after elution, Cd, Ni, Pb, Zn of complex state etc. is moved to anode chamber, from
And reach heavy metal in soil pollution components and remove and soil remediation purpose.
(2) heavy metal contaminated soil carries out pH value optimization and elution respectively, then carries out electro reclamation to it, and the invention is special
Three processes in profit are irreplaceable, and the usage amount of traditional heavy-metal contaminated soil leacheate can be reduced using this method,
Reduction elution risk, reinforcing heavy-metal contaminated soil elution repairing effect.
(3) the heavy metal pollution component after elution is present in soil with complex state, during electro reclamation, its electricity
The mechanisms such as migration, electrodialysis, electrophoresis and repairing effect not by or be less subject to electro reclamation process soil pH value change and
Influence, is adapted to actual a wide range of heavy-metal contaminated soil reparation.
Brief description of the drawings
Fig. 1 is apparatus of the present invention structural representation.
Label in figure：1 elution liquid storage tank, 2 first peristaltic pumps, 3 mixers, 4 acid storage tanks, 5 second peristaltic pumps, 6 alkali storage tanks,
It is 7 the 3rd peristaltic pumps, 8 contaminated soil storage tanks, 9 slush pumps, 10 anode electrodes, 11 cathode electrodes, 12 anode liquid storage tanks, 13 the 4th compacted
Dynamic pump, 14 agitating devices, 15 anode chambers, 16 cathode chambers, 17 electro reclamation rooms, 18 dc sources, 19 the 5th peristaltic pumps, 20 the 6th
Peristaltic pump, 21 negative electrode liquid storage tanks, 22 the 7th peristaltic pumps.
Embodiment
The invention provides a kind of elution of heavy-metal contaminated soil-electronic joint prosthetic device and method, with reference to
The drawings and specific embodiments are described further to patent of the present invention.
Embodiment 1：
As shown in Figure 1, the electronic joint prosthetic device of the elution of heavy-metal contaminated soil of the invention, it includes as follows：Drench
Wash system and electro reclamation system；
Described elution circuit includes elution liquid storage tank 1, the first peristaltic pump 2, mixer 3, acid storage tank 4, the second peristaltic pump
5th, alkali storage tank 6, the 3rd peristaltic pump 7 and contaminated soil storage tank 8；Wherein, elution liquid storage tank 1, acid storage tank 4, alkali storage tank 6 pass through respectively
First peristaltic pump 2, the second peristaltic pump 5 and the 3rd peristaltic pump 7 are connected with contaminated soil storage tank 8；Set inside contaminated soil storage tank 8
It is equipped with mixer 3；
Described electro reclamation system includes anode electrode 10, cathode electrode 11, anode liquid storage tank 12, the 4th peristaltic pump
13rd, agitating device 14, anode chamber 15, cathode chamber 16, electro reclamation room 17, dc source 18, the 5th peristaltic pump the 19, the 6th are wriggled
Pump 20, the peristaltic pump 22 of negative electrode liquid storage tank 21 and the 7th；Wherein, the side of electro reclamation room 17 is separated with anode chamber 15 by non-woven fabrics,
Opposite side is separated with cathode chamber 16 by non-woven fabrics, and anode chamber 15 and cathode chamber 16 are not contacted；Divide in anode chamber 15 and cathode chamber 16
Agitating device 14 is not provided with；The negative electrode of dc source 18 is connected with cathode electrode 11, and cathode electrode 11 is placed in cathode chamber 16,
The anode of dc source 18 is connected with anode electrode 10, and anode electrode 10 is placed in anode chamber 15；Anode liquid storage tank 12 passes through
Four peristaltic pumps 13 are connected with anode chamber 14, and anode chamber 14 is connected by the 5th peristaltic pump 19 with anode liquid storage tank 12, form loop,
And its mouth of pipe of part and liquid level of electrolyte that the pipeline where the 5th peristaltic pump 19 is located in anode chamber 15 are tangent；Negative electrode liquid storage tank
21 are connected by the 7th peristaltic pump 22 with cathode chamber 16, and cathode chamber 16 is connected by the 6th peristaltic pump 20 and negative electrode liquid storage tank 21
Logical, the pipeline where forming loop, and the 6th peristaltic pump 20 is located at its mouth of pipe of part and liquid level of electrolyte phase in cathode chamber 16
Cut；
The bottom of contaminated soil storage tank 8 in elution circuit is connected by slush pump 9 with electro reclamation room 17.
Embodiment 2：
The method that the electronic joint of elution for carrying out heavy-metal contaminated soil using the device of embodiment 1 is repaired, this method bag
Include following steps：
(a) heavy-metal contaminated soil is placed in contaminated soil storage tank 8, passes through 7 points of the second peristaltic pump 5 or the 3rd peristaltic pump
The acid solution in acid storage tank 4 or alkali storage tank 6 or alkali lye are not added in contaminated soil storage tank 8, mixer 3 is opened and persistently stirs, make
Soil pH in contaminated soil storage tank 8 is uniform；
(b) leacheate eluted in liquid storage tank 1 is added in contaminated soil storage tank 8 by the first peristaltic pump 2, be kept stirring for
Machine 3 is persistently stirred, and the soil in contaminated soil storage tank 8 is fully mixed with leacheate, it is ensured that heavy metal components fill with leacheate
Divide the forms such as reaction generation complex compound；
(c) soil in contaminated soil storage tank 8 is transferred to by electro reclamation room 17 by slush pump 9；
(d) after the soil in electro reclamation room 17 is stood, dc source 18 is connected, in anode electrode 10 and cathode electrode 11
Between form potential gradient；
(e) it is synchronous to open the 4th peristaltic pump 13 and the 5th peristaltic pump 19, to keep the liquid level of electrolyte in anode chamber 15 high
Degree and concentration of electrolyte；It is synchronous to open the 6th peristaltic pump 20 and the 7th peristaltic pump 22, to keep the electrolyte liquid in cathode chamber 16
Face height and concentration of electrolyte；
(f) during electro reclamation, it is kept stirring for the continuous running of device 14, it is ensured that the homogeneity of electrolyte solution.
Described heavy metal pollution is Cd pollutions, Ni pollutions, Pb pollutions or Zn pollutions.
In step (a), the acid solution that described acid storage tank 4 is built-in with is HNO3The aqueous solution, what described alkali storage tank 6 was built-in with
Alkali lye is the NaOH aqueous solution or the KOH aqueous solution.
In step (a), make the soil pH in contaminated soil storage tank 8 uniform and between pH scopes 2~5.
In step (b), described leacheate is 0.1~1mol/L disodium ethylene diamine tetra-acetic acid aqueous solutions, 0.1~1mol/L
Sodium citrate aqueous solution or 0.1~1mol/L acetic acid aqueous solutions.
In step (b), rubbed according to solute in the heavy metal element and leacheate in contaminated soil in contaminated soil storage tank 8
You elute the addition of the leacheate in liquid storage tank 1 than being calculated for 1: 1.1~1.2.
In step (b), described dc source 18, potential gradient is 0.1~5V/cm, anode electrode 10 and cathode electrode
11 materials are graphite electrode plate or carbon felt electrode plate.
In step (e), the electrolyte in anode chamber and anode liquid storage tank is 0.01~1mol/L NaNO3The aqueous solution or
0.01~1mol/LKNO3The aqueous solution；Catholyte in cathode chamber and negative electrode liquid storage tank is 0.01~0.5mol/LpH 2
~4 acetic acid-sodium acetate buffer solution.
The inventive method, it is general to take within every 6 hours pedotheque to carry out analysis detection from electro reclamation room, when heavy metal is dense
When degree remains above reparation desired value, proceed electro reclamation；During less than or equal to repairing desired value, stop electro reclamation.Electricity is repaiied
After multiple junction beam, soil is kept in and waits to check and accept.
Embodiment described above is only to absolutely prove preferred embodiment that patent of the present invention is lifted, the guarantor of patent of the present invention
Protect scope not limited to this.Equivalent substitute or change that the professional and technical personnel of the art is made on the basis of patent of the present invention
Change, within the protection domain of patent of the present invention.The protection domain of patent of the present invention is defined by claims.
Claims (5)
1. the elution for carrying out heavy-metal contaminated soil using the electronic joint prosthetic device of elution of heavy-metal contaminated soil is electronic
Close the method repaired, it is characterised in that this method comprises the following steps：
(a) heavy-metal contaminated soil is placed in contaminated soil storage tank (8), passes through the second peristaltic pump (5) or the 3rd peristaltic pump (7)
The acid solution in acid storage tank (4) or alkali storage tank (6) or alkali lye are added in contaminated soil storage tank (8) respectively, mixer (3) is opened and holds
Continuous stirring, makes the soil pH in contaminated soil storage tank (8) uniform；
(b) leacheate that will be eluted by the first peristaltic pump (2) in liquid storage tank (1) is added in contaminated soil storage tank (8), keeps stirring
Machine (3) persistently stirring is mixed, the soil in contaminated soil storage tank (8) is fully mixed with leacheate；
(c) soil in contaminated soil storage tank (8) is transferred to by electro reclamation room (17) by slush pump (9)；
(d) after the soil in electro reclamation room (17) is stood, dc source (18) is connected, in anode electrode (10) and cathode electrode
(11) potential gradient is formed between；
(e) it is synchronous to open the 4th peristaltic pump (13) and the 5th peristaltic pump (19), to keep the liquid level of electrolyte in anode chamber (15)
Height and concentration of electrolyte；It is synchronous to open the 6th peristaltic pump (20) and the 7th peristaltic pump (22), to keep in cathode chamber (16)
Liquid level of electrolyte height and concentration of electrolyte；
(f) during electro reclamation, it is kept stirring for device (14) continuous running, it is ensured that the homogeneity of electrolyte solution；
Wherein, the electronic joint prosthetic device of the elution of described heavy-metal contaminated soil includes as follows：Elution circuit and electronic repair
Complex system；
Described elution circuit includes elution liquid storage tank (1), the first peristaltic pump (2), mixer (3), acid storage tank (4), second compacted
Dynamic pump (5), alkali storage tank (6), the 3rd peristaltic pump (7) and contaminated soil storage tank (8)；Wherein, elution liquid storage tank (1), acid storage tank
(4), alkali storage tank (6) passes through the first peristaltic pump (2), the second peristaltic pump (5) and the 3rd peristaltic pump (7) and contaminated soil storage tank respectively
(8) it is connected；Contaminated soil storage tank (8) is internally provided with mixer (3)；
Described electro reclamation system includes anode electrode (10), cathode electrode (11), anode liquid storage tank (12), the 4th peristaltic pump
(13), agitating device (14), anode chamber (15), cathode chamber (16), electro reclamation room (17), dc source (18), the 5th are wriggled
Pump (19), the 6th peristaltic pump (20), negative electrode liquid storage tank (21) and the 7th peristaltic pump (22)；Wherein, electro reclamation room (17) side
Anode chamber (15) is separated with by non-woven fabrics, opposite side is separated with cathode chamber (16), anode chamber (15) and cathode chamber by non-woven fabrics
(16) do not contact；Agitating device (14) is respectively arranged with anode chamber (15) and cathode chamber (16)；The negative electrode of dc source (18)
It is connected with cathode electrode (11), cathode electrode (11) is placed in cathode chamber (16), the anode and anode electrode of dc source (18)
(10) it is connected, anode electrode (10) is placed in anode chamber (15)；Anode liquid storage tank (12) passes through the 4th peristaltic pump (13) and anode
Room (15) is connected, and anode chamber (15) are connected by the 5th peristaltic pump (19) with anode liquid storage tank (12), formation loop, and the 5th compacted
Its mouth of pipe of part and liquid level of electrolyte that pipeline where dynamic pump (19) is located in anode chamber (15) are tangent；Negative electrode liquid storage tank (21)
It is connected by the 7th peristaltic pump (22) with cathode chamber (16), cathode chamber (16) passes through the 6th peristaltic pump (20) and negative electrode liquid storage tank
(21) connect, the pipeline where forming loop, and the 6th peristaltic pump (20) is located at its mouth of pipe of part and electricity in cathode chamber (16)
Solve liquid liquid level tangent；Contaminated soil storage tank (8) bottom in elution circuit is connected by slush pump (9) and electro reclamation room (17)
It is logical；
In step (a), make the soil pH in contaminated soil storage tank (8) uniform and between pH2~5；
In step (b), described leacheate is 0.1~1mol/L disodium ethylene diamine tetra-acetic acid aqueous solutions, 0.1~1mol/L lemons
Acid sodium aqueous solution or 0.1~1mol/L acetic acid aqueous solutions；
In step (b), according to mole of solute in the heavy metal element and leacheate in contaminated soil in contaminated soil storage tank (8)
Than the addition that the leacheate in elution liquid storage tank (1) is calculated for 1: 1.1~1.2.
2. according to the method described in claim 1, it is characterised in that described heavy metal pollution is Cd pollutions, Ni pollutions, Pb dirts
Dye or Zn pollutions.
3. the acid that according to the method described in claim 1, it is characterised in that in step (a), described acid storage tank (4) is built-in with
Liquid is HNO3The aqueous solution, the alkali lye that described alkali storage tank (6) is built-in with is the NaOH aqueous solution or the KOH aqueous solution.
4. according to the method described in claim 1, it is characterised in that in step (d), described dc source (18), potential ladder
Spend for 0.1~5V/cm, anode electrode (10) and cathode electrode (11) material are graphite electrode plate or carbon felt electrode plate.
5. according to the method described in claim 1, it is characterised in that in step (e), in anode chamber (15) and anode liquid storage tank
Electrolyte be 0.01~1mol/L NaNO3The aqueous solution or 0.01~1mol/LKNO3The aqueous solution；Cathode chamber (16) and negative electrode
Catholyte in liquid storage tank (21) is 0.01~0.5mol/LpH, 2~4 acetic acid-sodium acetate buffer solution.
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| CN203380185U (en) * | 2013-07-18 | 2014-01-08 | 江南大学 | Device for restoring polluted soil by using electrodynamic force |
| CN103785677B (en) * | 2014-01-26 | 2016-08-17 | 河北欧美环境工程有限公司 | Heavy-metal contaminated soil reparation and leacheate recycle integrated apparatus and method thereof |
| CN204710845U (en) * | 2015-06-03 | 2015-10-21 | 江苏省环境科学研究院 | A kind of electronic combine d bioremediation device of drip washing of heavy-metal contaminated soil |
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