CN109622597A - A kind of electrochemical repair method of heavy-metal contaminated soil - Google Patents
A kind of electrochemical repair method of heavy-metal contaminated soil Download PDFInfo
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- CN109622597A CN109622597A CN201910070239.9A CN201910070239A CN109622597A CN 109622597 A CN109622597 A CN 109622597A CN 201910070239 A CN201910070239 A CN 201910070239A CN 109622597 A CN109622597 A CN 109622597A
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- repair method
- contaminated soil
- electrode plate
- electrochemical repair
- soil
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The embodiment of the invention discloses a kind of electrochemical repair method of heavy-metal contaminated soil, which includes: that contaminated soil is placed between electrode plate by (a)；(b) in contaminated soil surface spraying activator；(c) electrode plate is subjected to energization processing；(d) calcium oxide is added into the contaminated soil in the electrode pad region of heavy metal transformation.Electrochemical repair method of the present invention can fast and efficiently remove Heavy Metals in Contaminated Soils, and adjust soil pH value, and the electrochemical repair method is applied widely and no coupling product generates.
Description
Technical field
The present embodiments relate to technical field of soil remediation, and in particular to a kind of electrochemistry of heavy-metal contaminated soil is repaired
Compound method.
Background technique
It is heavy metal-polluted to have a finger in every pie the environmental pollution as caused by heavy metal or its compound.Mainly by mining, exhaust gas discharge, sewage
It irrigates and using caused by the human factors such as heavy metals exceeding standard product.Because mankind's activity causes the content of beary metal in environment to increase,
It beyond normal range (NR), is directly detrimental to health, and environmental quality is caused to deteriorate.Compared with atmosphere and water pollution, soil remediation
Seem more difficult.Heavy metal pollution of soil is different from some organic pollutants, and the heavy metal in soil can not degrade, with soil
Separating difficulty is very big, repairs extremely difficult.
Currently, being directed to heavy metal pollution of soil, a variety of recovery techniques are developed, are repaired including biology in situ
Multiple, peripheral doses, chemical remediation, but these types of method has certain scope of application.For example, microorganism is to heavy metal soil
Self-purification speed is very slow, and contaminated type limitation, peripheral doses are influenced by factors such as soil heterogeneity, permeability, chemistry
Repair the by-product bigger there may be toxicity.
Summary of the invention
For this purpose, the embodiment of the present invention provides a kind of electrochemical repair method of heavy-metal contaminated soil, the electrochemical rehabilitation
Method can fast and efficiently remove Heavy Metals in Contaminated Soils, and adjust contaminated soil pH value；In addition, the electrochemical rehabilitation
Method is applied widely and no coupling product generates.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
First aspect of the embodiment of the present invention provides a kind of electrochemical repair method of heavy-metal contaminated soil, which repairs
Compound method includes the following steps:
(a) contaminated soil is placed between electrode plate；
(b) in contaminated soil surface spraying activator；
(c) electrode plate is subjected to energization processing；
(d) calcium oxide is added into the contaminated soil in the electrode pad region of heavy metal transformation.
The present invention by spraying activator into heavy-metal contaminated soil, using activator and heavy metal form electrification can
Complex compound is migrated, cathode plate or anode plate are moved under the action of electric field, then add oxygen near the pole plate of heavy metal accumulation
Change calcium, adjust soil pH, fix heavy metal, to realize the removal to heavy metal in soil；In addition, the electrochemical rehabilitation side
Method is applied widely and no coupling product generates.
In the present invention stringent limitation is not done to the material of electrode plate, such as can be electrode plate material well known in the art,
Preferably, the electrode plate graphite electrode plate.
In one embodiment of this invention, in the electrode pad region of the additive amount of the calcium oxide and close heavy metal transformation
Contaminated soil volume ratio be 1.5-2.5Kg/m3.By the restriction of the additive amount to calcium oxide, dirt can be preferably improved
Soil environment is contaminated, the electrochemical rehabilitation effect of contaminated soil is improved.
In another embodiment of the invention, the electrode pad region of the close heavy metal transformation is apart from electrode plate 2-
Region within 5cm.
In another embodiment of the present invention, it is molten that the activator is selected from citric acid solution, sodium citrate solution, sodium acetate
Any one in liquid, glacial acetic acid solution and sodium acetate solution.By the specific selection of activator, the work of heavy metal can be improved
Property, migration rate and efficiency are improved, repairing effect is improved.
Further, the mass concentration of the citric acid solution and sodium citrate solution is respectively 10-60%.
Further, the mass concentration of the glacial acetic acid solution and glacial acetic acid sodium solution is respectively 10-60%.
Further, the mass concentration of the sodium acetate solution is 15-25%.
In one more embodiment of the present invention, spacing is 0.1-0.5m between the electrode plate；Voltage between electrode plate
Intensity is 2-20V/cm, current strength 0.05-2A.
In yet another embodiment of the invention, the energization processing time is 24-48h.
The present invention passes through voltage and current and conduction time between coordination electrode plate, can be improved heavy metal ion
The removal rate of migration rate and heavy metal ion reaches the heavy metal ion gone in decontamination soil rapidly and efficiently.
The type of Heavy Metals in Contaminated Soils is not limited strictly in the present invention, it is preferable that weight in the contaminated soil
Any one or more of metal in copper, zinc, lead, chromium and iron；
Further, when the content of beary metal is 100-500mk/kg, the additive amount and contaminated soil of the activator
Volume ratio be 0.5-1.5L/m3。
Preferably, the Heavy Metals in Contaminated Soils is cadmium and/or arsenic；
Further, when the content of beary metal is 0.6-30mk/kg, the additive amount of the activator and contaminated soil
Volume ratio is 0.5-1.5L/m3。
The present invention targetedly limits the addition of activator according to Heavy Metals in Contaminated Soils type and pollution level
Amount, can sufficiently activate the heavy metal in soil, improve electrochemical rehabilitation effect.
Compared with prior art, at least there is following advantage in the embodiment of the present invention:
(1) present invention is formed using activator and heavy metal and is charged by spraying activator into heavy-metal contaminated soil
Transportable complex compound, move to cathode plate or anode plate under the action of electric field, then add near the pole plate of heavy metal accumulation
Add calcium oxide, adjust soil pH, fix heavy metal, to realize the removal to heavy metal in soil；In addition, the electrochemistry is repaired
Compound method is applied widely and no coupling product generates.
(2) present invention targetedly limits adding for activator according to Heavy Metals in Contaminated Soils type and pollution level
Dosage can sufficiently activate the heavy metal in soil, improve electrochemical rehabilitation effect.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Each raw material that following embodiment uses is as follows:
Copper polluted soil: copper content 138mg/kg；PH value 5.6；Source plastic processing factory waste water；
Cadmium pollution soil: cadmium content 1.5mg/kg；PH value 5.8；Source plastic processing factory waste water；
Lead-contaminated soil: lead content 384mg/kg；PH value 5.5；Source plastic processing factory waste water.
Embodiment 1
The present embodiment is a kind of electrochemical repair method of copper polluted soil, which includes following step
It is rapid:
(a) contaminated soil is placed in spacing between two electrode plate of 0.2m；
It (b) is 30% sodium citrate solution, the additive amount of sodium citrate solution in contaminated soil surface spraying mass concentration
Volume ratio with contaminated soil is 0.8L/m3；
(c) electrode plate is subjected to energization processing, the voltage strength between electrode plate is 3V/cm, current strength 0.2A, place
Manage 36h；
(d) after being powered, pole plate is taken out, calcium oxide, oxygen are being added into the contaminated soil within cathode plate 5cm
Change calcium additive amount is 2kg/m3。
Using spectrophotometer to copper concentration in treated soil detect and detection processing after soil pH value,
Testing result is that copper concentration is 27.1mg/kg；PH value is 7.3.
Embodiment 2
The present embodiment is a kind of electrochemical repair method of cadmium pollution soil, which includes following step
It is rapid:
(a) contaminated soil is placed in spacing between two electrode plate of 0.1m；
(b) contaminated soil surface spraying mass concentration be 20% sodium acetate solution, the additive amount of sodium acetate solution with
The volume ratio of contaminated soil is 0.5L/m3；
(c) electrode plate is subjected to energization processing, the voltage strength between electrode plate be 2V/cm, current strength 0.05A,
Handle 36h；
(d) after being powered, pole plate is taken out, calcium oxide, oxygen are being added into the contaminated soil within cathode plate 2cm
Change calcium additive amount is 2kg/m3。
Cadmium concentration in treated soil and pH value are detected using the method for embodiment 1, testing result is cadmium
Concentration is 0.15mg/kg；PH value is 7.1.
Embodiment 3
The present embodiment is a kind of electrochemical repair method of lead-contaminated soil, which includes following step
It is rapid:
(a) contaminated soil is placed in spacing between two electrode plate of 0.4m；
It (b) is 50% citric acid solution, the additive amount of citric acid solution and dirt in contaminated soil surface spraying mass concentration
The volume ratio for contaminating soil is 1.5L/m3；
(c) electrode plate is subjected to energization processing, the voltage strength between electrode plate be 15V/cm, current strength 1.2A,
Processing is for 24 hours；
(d) after being powered, pole plate is taken out, calcium oxide, oxygen are being added into the contaminated soil within cathode plate 5cm
Change calcium additive amount is 2kg/m3。
Lead concentration in treated soil and pH value are detected using the method for embodiment 1, testing result is lead
Concentration is 20.33mg/kg；PH value is 7.2.
Reference examples 1
This reference examples is a kind of electrochemical repair method of copper polluted soil, the electrochemical repair method and embodiment 1
Restorative procedure is essentially identical, and difference is only that in step (b) that the additive amount of sodium citrate solution and the volume ratio of contaminated soil are
2L/m3。
Copper concentration in treated soil and pH value are detected using the method for embodiment 1, testing result is copper
Concentration is 49.7mg/kg；PH value is 7.5.
Studies have shown that excessive citric acid will lead to adsorption precipitation in oxidation-reduction process, thus increase heavy metal from
Sub- content.
Reference examples 2
This reference examples is a kind of electrochemical repair method of cadmium pollution soil, the electrochemical repair method and embodiment 2
Restorative procedure is essentially identical, and difference is only that in step (c), and the voltage strength between electrode plate is 1V/cm；
Cadmium concentration in treated soil and pH value are detected using the method for embodiment 2, testing result is cadmium
Concentration is 0.46mg/kg；PH value is 7.2.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of electrochemical repair method of heavy-metal contaminated soil, which comprises the steps of:
(a) contaminated soil is placed between electrode plate；
(b) in contaminated soil surface spraying activator；
(c) electrode plate is subjected to energization processing；
(d) calcium oxide is added into the contaminated soil in the electrode pad region of heavy metal transformation.
2. electrochemical repair method according to claim 1, which is characterized in that the additive amount of the calcium oxide and close weight
The volume ratio of contaminated soil in the electrode pad region of metal migration is 1.5-2.5Kg/m3。
3. electrochemical repair method according to claim 1, which is characterized in that the electrode plate of the close heavy metal transformation
Region is the region within electrode plate 2-5cm.
4. electrochemical repair method according to claim 1, which is characterized in that the activator be selected from citric acid solution,
Any one in sodium citrate solution, sodium acetate solution, glacial acetic acid solution and sodium acetate solution.
5. electrochemical repair method according to claim 1, which is characterized in that spacing is 0.1- between the electrode plate
0.5m；Voltage strength between electrode plate is 2-20V/cm, current strength 0.05-2A.
6. electrochemical repair method according to claim 1, which is characterized in that the energization processing time is 24-48h.
7. -6 any electrochemical repair method according to claim 1, which is characterized in that the Heavy Metals in Contaminated Soils
Any one or more in copper, zinc, lead, chromium and iron.
8. electrochemical repair method according to claim 7, which is characterized in that the content of beary metal is 100-500mk/
When kg, the additive amount of the activator and the volume ratio of contaminated soil are 0.5-1.5L/m3。
9. -6 any electrochemical repair method according to claim 1, which is characterized in that the Heavy Metals in Contaminated Soils
For cadmium and/or arsenic.
10. electrochemical repair method according to claim 9, which is characterized in that the content of beary metal is 0.6-30mk/
When kg, the additive amount of the activator and the volume ratio of contaminated soil are 0.5-1.5L/m3。
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| CN201910070239.9A CN109622597A (en) | 2019-01-24 | 2019-01-24 | A kind of electrochemical repair method of heavy-metal contaminated soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114192561A (en) * | 2021-11-17 | 2022-03-18 | 广东工业大学 | Remediation method for cadmium-containing contaminated soil and application thereof |
| CN114226432A (en) * | 2020-09-09 | 2022-03-25 | 农业农村部环境保护科研监测所 | A method for repairing cadmium and arsenic polluted paddy fields and a detoxification device for cadmium and arsenic |
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| CN114226432A (en) * | 2020-09-09 | 2022-03-25 | 农业农村部环境保护科研监测所 | A method for repairing cadmium and arsenic polluted paddy fields and a detoxification device for cadmium and arsenic |
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Effective date of registration: 20210928 Address after: 2015 doctoral student of China University of Geosciences (Beijing), No. 20, Chengfu Road, Haidian District, Beijing 100082 Applicant after: Chen Fangxin Address before: 300282 the second floor of the second gate in the north of the bottom business in the east of ju'anli, Taiping Town, Binhai New Area, Tianjin Applicant before: TIANJIN YOUAI ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |
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Application publication date: 20190416 |