CN109013692A - Method for strengthening remediation of heavy metal contaminated soil and application - Google Patents
Method for strengthening remediation of heavy metal contaminated soil and application Download PDFInfo
- Publication number
- CN109013692A CN109013692A CN201810957142.5A CN201810957142A CN109013692A CN 109013692 A CN109013692 A CN 109013692A CN 201810957142 A CN201810957142 A CN 201810957142A CN 109013692 A CN109013692 A CN 109013692A
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- electrode
- soil
- heavy metal
- strengthening
- anode
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Classifications
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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
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
Abstract
The invention provides a method for strengthening remediation of heavy metal contaminated soil and application thereof, and relates to the technical field of soil remediation. A method for strengthening and repairing heavy metal contaminated soil comprises the following steps: and (3) adopting a method of fixing the cathode and gradually shortening the distance between the anode and the cathode to carry out electric remediation on the polluted soil. The repairing method is simple and convenient to operate, strong in controllability, capable of increasing the mobility of heavy metals and the removal rate, remarkable in effect, low in energy consumption and good in application prospect.
Description
Technical field
The present invention relates to technical field of soil remediation, and in particular to a kind of method for strengthening restoration of soil polluted by heavy metal
And application.
Background technique
Technology of Electrodynamics Renovation is one of recovery technique of soil pollution, be it is a kind of green, cleaning, efficiently to pollution
The technology that soil environment is handled is to apply DC power supply at contaminated soil both ends, under DC electric field effect, is moved using electricity
The removal pollutants such as heavy metal in soil and organic matter such as shifting, electrodialysis and electrophoresis.This method is suitable for in-situ immobilization, without digging
Digging body saves expense；Depth is handled simultaneously up to 10-20 meters etc., and treatment effeciency is high；With Environmental compatibility, and it is suitable for
Handle heavy metal and organic pollutant etc..Electro reclamation can overcome many defects of previous recovery technique, such as can handle low
Infiltrative soil is suitable for multiphase nonuniform soil medium and bulky grain and little particle soil media, can effectively remove soil
Middle heavy metal, overall expenses are low etc..Therefore, it has been applied to the reparation of heavy-metal contaminated soil.
However, there is also some problems, such as heavy metal ion to be known as " focusing effect in the deposited phenomenon that cathode generates for the technology
Answer ", this is the major obstacle for influencing heavy-metal contaminated soil electro reclamation.Many researchs have such as added strong complexing agent and have waited until soil
With use amberplex control pH value and eletrokinetic potential.These improved technical operations are complicated, because introducing additionally
The use of chemical substance or equipment leads to secondary pollution.Therefore it finds a kind of effective method and does not add reagent and accelerate to repair
Rate becomes urgent problem to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for strengthening restoration of soil polluted by heavy metal, and this method is easy to operate,
Remediation efficiency is improved, soil remediation effect is enhanced, reduces energy consumption.
The present invention solves its technical problem and adopts the following technical solutions to realize.
The present invention proposes a kind of method for strengthening restoration of soil polluted by heavy metal, comprising:
Using fixed negative pole, the method that the distance between anode and cathode is gradually shortened repairs contaminated soil.
The beneficial effects of the present invention are:
The present invention uses fixed negative pole method, and the distance between anode and cathode is gradually shortened, repairs to contaminated soil
It is multiple.It is equipped with multiple anodes between the anode and cathode at both ends, successively switches anode after repairing a period of time, realizes that anode approaches
Cathode.When starting to repair, the H of anode generation+It is freely accessible to soil, the OH that cathode generates-Since the second filter layer cannot be introduced into soil
Earth causes soil pH value to reduce.H+The reverse electromigration of plasma increases the solubility of the heavy metal elements such as Zn, increases and moves
Shifting rate finally increases removal rate to accelerate it from the desorption process in soil matrix.Due between cathode anode away from
From being gradually shortened, energy is no longer consumed in the part soil for repairing completion, energy consumption needed for reaching same repairing effect also because
This and reduce.The restorative procedure is easy to operate, and controllability is strong, significant effect, has biggish superiority, has good application
Prospect.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram that slot is repaired in electrolysis provided in an embodiment of the present invention.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
The method to a kind of reinforcing restoration of soil polluted by heavy metal of the embodiment of the present invention and application carry out specifically below
It is bright.
A kind of method for strengthening restoration of soil polluted by heavy metal provided in an embodiment of the present invention, comprising: fixed negative pole is used,
The method that the distance between anode and cathode is gradually shortened, repairs contaminated soil.
The basic principle of electrodynamics method is to be inserted into electrode in contaminated soil region, forms electric field after applying direct current, soil
Pollutant in the earth directional migration under DC electric field effect is enriched in electrode zone, then passes through other methods removal.Through inventing
The lot of experiments of people is found, shortens the distance between positive and negative anodes, fixed negative pole in repair process orderly switches anode array
Constantly to approach cathode, the purpose of enhancing repairing polluted soil effect can achieve.Contaminated soil can be containing zinc, iron, copper,
The soil of the heavy metal pollutions such as cadmium, lead.
The present invention repairs slot using electrolysis and carries out soil remediation.Specifically, it includes groove body that slot is repaired in electrolysis, it is equipped in groove body
First filter layer, the second filter layer and electrode.
Electrode includes first electrode, second electrode and at least one third electrode, and first electrode and second electrode are solid respectively
Due to the opposite both ends of groove body, third electrode is set between first electrode and second electrode.First filter layer and the second filtering
Groove body is separated to form the first electrolytic cell, soil chamber and the second electrolytic cell by layer, and soil chamber is located at the first electrolytic cell and the second electrolysis
Between slot；Soil chamber is used to accommodating electrolysis for holding contaminated soil in the first electrolytic cell, soil chamber and the second electrolytic cell
Liquid.In the present embodiment, the first filter layer and the second filter layer are filter paper.First electrode is set in the first electrolytic cell, and second
Electrode is set in the second electrolytic cell, and third electrode is set in soil chamber.Generally third electrode is multiple, such as three, five.
The embodiment of the present invention uses size for 26cm × 10cm × 10cm groove body, and multiple third electrode spaced sets are in first
Between electrode and second electrode.
Electrode is selected from graphite electrode, titanium alloy electrode and stainless steel electrode, and the shape of electrode is plate or rodlike or net
Shape.
There is power supply anode and cathode, second electrode to be electrically connected with cathode, the input terminal of single pole multiple throw and power supply
Anode electrical connection, first electrode, third electrode are electrically connected with the output end of single pole multiple throw respectively, pass through single pole multiple throw
Realize the variation of anode.Processor is electrically connected with single pole multiple throw, for controlling first electrode or a third electrode and electricity
The anode electrical connection in source.Timer is equipped in processor, for controlling first electrode or a third electrode according to preset time
It is electrically connected with the anode of power supply.
Soil and electrolyte are placed in groove body, when starting to repair, first electrode is electrically connected with the anode of power supply, and second
Electrode is electrically connected with cathode, carries out electro reclamation.After repairing preset time, the connection of first electrode and anode is disconnected, along from the
Third electrode is successively electrically connected with the anode of power supply to the direction of second electrode, third electrode is electrically connected with anode by one electrode
It connects, and is disconnected again after repairing preset time, realize that anode approaches cathode.With the contracting of distance between third electrode and second electrode
Short, preset repair time gradually extends, and such as initially repair time is 5h every time, and last 2 repair time is 10h.Groove body
Equipped with pump, circular electrolyte avoids generating concentration gradient.
Further, electrolyte is the organic monoacid aqueous solution that concentration is 0.01~0.2mol/L.Organic monoacid is selected from cream
At least one of acid, citric acid and acetic acid.
Further, the volume ratio of soil and electrolyte is 1:1~3.
Further, in repair process, the intracorporal electric field strength of slot is 1~5V/cm, and electric field strength is constant.
When starting to repair, the H of anode generation+It is freely accessible to soil, the OH that cathode generates-Since the second filter layer can not be into
Enter soil, soil pH value is caused to reduce.H+The reverse electromigration of plasma increases the solubility of the heavy metal elements such as Zn, increases
Mobility to accelerate it from the desorption process in soil matrix finally increases removal rate.This is because approaching electrode
During method is repaired, balanced balanced current is larger, promotes H+Generation, at the same time, cathode is constantly approached to anode, this makes
H+It more concentrates between the two poles of the earth, to reduce the pH value of two interpolar soil.According to experimental design, two interelectrode ranges are
Effective operation interval of electrode method reparation is approached, the reduction of two interpolar soil pH values means that the H+ of generation by more effective land productivity
It uses, this would be even more beneficial to the release of Zn in soil.
Less, current potential is higher, is conducive to heavy metal ion for the oxidation-reduction potential variation of this method treated soil
Migration.Lower pH value and higher oxidation-reduction potential are all conducive to release heavy metal from soil particle and accelerate electric power
Learn rehabilitating soil process.
Since the distance between cathode anode is gradually shortened, energy is no longer consumed in the part soil for repairing completion, to be reached
It is also therefore reduced to energy consumption needed for same repairing effect.This method is easy to operate, improves remediation efficiency, enhances soil remediation
Effect reduces energy consumption, can be applied to field of environmental pollution control.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
Present embodiments provide a kind of method for strengthening restoration of soil polluted by heavy metal:
It will be put into groove body in weakly alkaline sandy soil, the lactic acid solution that concentration is 0.1mol/L is added.Soil and electrolysis
The volume ratio of liquid is 1:2.5.Soil in the present embodiment contains heavy metal zinc, and Zn content reaches 265mgkg-1, moisture content is
9.1%, starting pH is 7.6.
It is equipped with 5 third electrodes in groove body, is equidistantly arranged successively along the direction of first electrode to second electrode.By first
Electrode is electrically connected with the anode of power supply, and second electrode is electrically connected with cathode, carries out electro reclamation.The intracorporal electric field strength of slot is
5V/cm。
After repairing 5h, the anode of first electrode and power supply is disconnected, it will be near the third electrode of first electrode and power supply
Anode electrical connection, carries out electro reclamation.Then after being spaced 5h, the third electrode is disconnected, by second third electrode and power supply
Anode electrical connection, carries out electro reclamation.After being so switched to the 4th third electrode, electro reclamation 10h, then disconnect, connection the
Five third electrodes and anode, repair 10h.
Embodiment 2
Present embodiments provide a kind of method for strengthening restoration of soil polluted by heavy metal:
It will be put into groove body in weakly alkaline sandy soil, the solution that concentration is 0.01mol/L is added.Soil and electrolyte
Volume ratio is 1:1.Soil in the present embodiment contains heavy metal zinc, and Zn content reaches 265mgkg-1, moisture content 9.1%,
Originating pH is 7.6.
It is equipped with 5 third electrodes in groove body, is equidistantly arranged successively along the direction of first electrode to second electrode.By first
Electrode is electrically connected with the anode of power supply, and second electrode is electrically connected with cathode, carries out electro reclamation.The intracorporal electric field strength of slot is
1V/cm。
After repairing 5h, the anode of first electrode and power supply is disconnected, it will be near the third electrode of first electrode and power supply
Anode electrical connection, carries out electro reclamation.Then after being spaced 5h, the third electrode is disconnected, by second third electrode and power supply
Anode electrical connection, carries out electro reclamation.Such one until the 5th third electrode.
Embodiment 3
Present embodiments provide a kind of method for strengthening restoration of soil polluted by heavy metal:
It will be put into groove body in weakly alkaline sandy soil, the citric acid solution that concentration is 0.2mol/L is added.Soil and electricity
The volume ratio for solving liquid is 1:3.Soil in the present embodiment contains heavy metal zinc, and Zn content reaches 265mgkg-1, moisture content is
9.1%, starting pH is 7.6.
It is equipped with 3 third electrodes in groove body, is equidistantly arranged successively along the direction of first electrode to second electrode.By first
Electrode is electrically connected with the anode of power supply, and second electrode is electrically connected with cathode, carries out electro reclamation.The intracorporal electric field strength of slot is
3V/cm。
After repairing 5h, the anode of first electrode and power supply is disconnected, it will be near the third electrode of first electrode and power supply
Anode electrical connection, carries out electro reclamation.Then after being spaced 5h, the third electrode is disconnected, by second third electrode and power supply
Anode electrical connection, carries out electro reclamation.After being so switched to third third electrode, electro reclamation 10h.
Embodiment 4
Present embodiments provide a kind of method for strengthening restoration of soil polluted by heavy metal:
It will be put into groove body in weakly alkaline sandy soil, the acetic acid solution that concentration is 0.05mol/L is added.Soil and electrolysis
The volume ratio of liquid is 1:2.Soil in the present embodiment contains heavy metal zinc, and Zn content reaches 265mgkg-1, moisture content is
9.1%, starting pH is 7.6.
It is equipped with 5 third electrodes in groove body, is equidistantly arranged successively along the direction of first electrode to second electrode.By first
Electrode is electrically connected with the anode of power supply, and second electrode is electrically connected with cathode, carries out electro reclamation.The intracorporal electric field strength of slot is
2V/cm。
After repairing 5h, the anode of first electrode and power supply is disconnected, it will be near the third electrode of first electrode and power supply
Anode electrical connection, carries out electro reclamation.Then after being spaced 5h, the third electrode is disconnected, by second third electrode and power supply
Anode electrical connection, carries out electro reclamation.After being so switched to the 4th third electrode, electro reclamation 10h, then disconnect, connection the
Five third electrodes and anode, repair 10h.
Embodiment 5
Present embodiments provide a kind of method for strengthening restoration of soil polluted by heavy metal:
It will be put into groove body in weakly alkaline sandy soil, the lactic acid solution that concentration is 0.1mol/L is added.Soil and electrolysis
The volume ratio of liquid is 1:2.Soil in the present embodiment contains heavy metal zinc, and Zn content reaches 265mgkg-1, moisture content is
9.1%, starting pH is 7.6.
It is equipped with 8 third electrodes in groove body, is equidistantly arranged successively along the direction of first electrode to second electrode.By first
Electrode is electrically connected with the anode of power supply, and second electrode is electrically connected with cathode, carries out electro reclamation.The intracorporal electric field strength of slot is
5V/cm。
After repairing 5h, the anode of first electrode and power supply is disconnected, it will be near the third electrode of first electrode and power supply
Anode electrical connection, carries out electro reclamation.Then after being spaced 5h, the third electrode is disconnected, by second third electrode and power supply
Anode electrical connection, carries out electro reclamation.After being so switched to the 5th third electrode, electro reclamation 10h, then disconnect, successively connect
The the 6th, the 7th third electrode and anode are connect, 10h is repaired.
Comparative example 1
This comparative example provides the method repairing polluted soil using fixed electrode, is with the difference place of embodiment 1,
It is not provided with third electrode, during electro reclamation, first electrode is electrically connected with the anode of power supply always.Soil in the present embodiment
Earth contains heavy metal zinc, and Zn content reaches 265mgkg-1, moisture content 9.1%, starting pH is 7.6.
Test example
Repair the measurement of front and back pedotheque content of beary metal: Soil Heavy Metal Elements Content measurement uses HCl-HNO3-
HF-HClO4Method digestion, thoroughly destroys the mineral lattice of soil, fully enters the element to be measured in sample in test solution.Pass through
The value of measurement calculates the removal efficiency of zinc.
PH value and conductance measurement: using Tu Shui than 1: 2.5 ultrasonic vibration 15min, 30min is stood.It should need in the process
Pay attention to avoiding that there is volatile acid or ammonium hydroxide in air.Then combination electrode is inserted into the dirty solution of lower part, and is gently agitated for,
Lower pH value is counted after equal pH instrument stable reading.Pedotheque takes with pH measurement unanimously in the measurement of soil conductivity.Soil is
Soil after reparation.The result is as follows:
1 test result of table
| Zinc removal efficiency/% | PH value | |
| Embodiment 1 | 63 | 5 |
| Embodiment 2 | 62 | 5.5 |
| Embodiment 3 | 61 | 5.5 |
| Embodiment 4 | 63 | 5 |
| Embodiment 5 | 64 | 5 |
| Comparative example 1 | 37 | 6 |
As shown in Table 1, Examples 1 to 5 is compared with comparative example 1, and the pH value of the soil of embodiment is relatively low, explanation
H in soil+It is more effectively used, is more advantageous to the release of Zn in soil, help to increase removal rate.Embodiment 1
The removal efficiency of~5 zinc is all larger than the removal efficiency of the zinc of comparative example 1, illustrates soil remediation method effect provided by the invention
Significantly, remediation efficiency can be effectively improved.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of method for strengthening restoration of soil polluted by heavy metal characterized by comprising
Using fixed negative pole, the method that the distance between anode and cathode is gradually shortened carries out electro reclamation to contaminated soil.
2. the method according to claim 1 for strengthening restoration of soil polluted by heavy metal, which is characterized in that repaired using electrolysis
Slot carries out soil remediation；
It includes groove body, electrode and power supply that slot is repaired in the electrolysis；
The electrode includes first electrode, second electrode and at least one third electrode, the first electrode and second electricity
Pole is individually fixed in the opposite both ends of the groove body, the third electrode be set to the first electrode and the second electrode it
Between；
The power supply has anode and cathode；
Soil and electrolyte are placed in the groove body, the first electrode is electrically connected with the anode, the second electrode
It is electrically connected with the cathode, carries out electro reclamation；
After repairing preset time, the connection of the first electrode Yu the anode is disconnected, third electrode and the anode are electrically connected
It connects, then is repaired.
3. the method according to claim 2 for strengthening restoration of soil polluted by heavy metal, which is characterized in that the electrode includes
Multiple third electrodes, multiple third electrode spaced sets are between the first electrode and the second electrode.
4. the method according to claim 3 for strengthening restoration of soil polluted by heavy metal, which is characterized in that disconnect described first
After the connection of electrode and the anode, edge is from the first electrode to the direction of the second electrode successively by third electrode and institute
Positive electrical connection is stated, and is disconnected again after repairing the preset time.
5. the method according to claim 2 for strengthening restoration of soil polluted by heavy metal, which is characterized in that the electrolyte is
Concentration is the environment amenable organic monoacid aqueous solution of 0.01~0.2mol/L.
6. the method according to claim 5 for strengthening restoration of soil polluted by heavy metal, which is characterized in that the organic monoacid
Selected from least one of lactic acid, citric acid and acetic acid.
7. the method according to claim 2 for strengthening restoration of soil polluted by heavy metal, which is characterized in that the soil and institute
The volume ratio for stating electrolyte is 1:1~3.
8. the method according to claim 2 for strengthening restoration of soil polluted by heavy metal, which is characterized in that in repair process,
The intracorporal electric field strength of slot is 1~5V/cm.
9. the method according to claim 2 for strengthening restoration of soil polluted by heavy metal, which is characterized in that the shape of the electrode
Shape is respectively any one of plate, rodlike, netted.
10. the method as described in any one of claim 1 to 9 for strengthening restoration of soil polluted by heavy metal is in the side of curbing environmental pollution
The application in face.
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Cited By (3)
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| CN113118201A (en) * | 2021-04-06 | 2021-07-16 | 沈阳大学 | Electric synergic remediation method for heavy metal-organic compound contaminated soil based on compressed electric field |
| CN114472496A (en) * | 2022-01-26 | 2022-05-13 | 中国葛洲坝集团生态环境工程有限公司 | Pretreatment system for reducing water content and heavy metal content of polluted soil |
| CN116603852A (en) * | 2023-06-15 | 2023-08-18 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113118201A (en) * | 2021-04-06 | 2021-07-16 | 沈阳大学 | Electric synergic remediation method for heavy metal-organic compound contaminated soil based on compressed electric field |
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| CN116603852A (en) * | 2023-06-15 | 2023-08-18 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
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