CN106378357A - Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method - Google Patents
Composite electrode for electro-kinetic remediation of heavy metal contaminated soil, electro-kinetic remediating device and electro-kinetic remediation method Download PDFInfo
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- CN106378357A CN106378357A CN201610891459.4A CN201610891459A CN106378357A CN 106378357 A CN106378357 A CN 106378357A CN 201610891459 A CN201610891459 A CN 201610891459A CN 106378357 A CN106378357 A CN 106378357A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention discloses a composite electrode for electro-kinetic remediation of heavy metal contaminated soil, an electro-kinetic remediating device and an electro-kinetic remediation method, and belongs to the technical field of remediation of heavy metal contaminated soil. The composite electrode disclosed by the invention is formed by a reticularly-coated composite material composed of conducting mediums; the composite material comprises modified sepiolite and modified chitosan; the composite material for the composite electrode disclosed by the invention is relatively large in surface area and is capable of adsorbing heavy metal ions coming from migration, so that in-site removal of heavy metal pollutants is realized, and cathode liquor needs not to be pumped out and treated subsequently after electro-kinetic remediation is ended. The electro-kinetic remediation method disclosed by the invention is capable of reducing pH changes near the cathode of the soil and preventing OH- generated by the cathode from entering the soil, so precipitation of heavy metal ions in the soil is avoided. By monitoring the pH near the anode and the cathode, the electric conductivity and concentration changes of heavy metal ions in real time, the electro-kinetic remediation method and the electro-kinetic remediating device disclosed by the invention have the advantages of being persistent, high in efficiency, simple and convenient in replacement and capable of remarkably shortening the remediation period and lowering the remediation cost.
Description
Technical field
The present invention relates to remediation of heavy metal-contaminated soil field is and in particular to a kind of be used for heavy-metal contaminated soil electricity
Dynamic reparation combination electrode and electric repair method.
Background technology
Electric repairing technique is to start to be applied to a kind of technology of improvement polluted soil from late 1980s.In electricity
In the presence of, heavy metal ion (as Pb, Cd, Cu, Zn etc.) in soil and inorganic ions are with electrodialysis and electromigratory side
Formula, to electrode transfer, then carries out centralized collection process.The method is particularly suitable for the clay of hyposmosis, can control pollutant
Flow direction.Soil pH value directly affects the adsorption and desorption of heavy metal ion in the soil liquid, precipitation and dissolving.Electrode
In reaction, the substantial amounts of OH that negative electrode produces-, so that the pH value near cathode electrode is increased, the OH of generation-If be not any limitation as, will
Migrate to anode under electric field action, thus the heavy metal ion easily causing in soil precipitates, this phenomenon is referred to as poly-
Burnt effect, is the technical bottleneck of electro reclamation.How to control the pH value in soil, become the research emphasis of electric repairing technique.
During heavy-metal contaminated soil electro reclamation, heavy metal contaminants occur electricity to move to anode under electric field action
Shifting acts on, and entering in electrolytic cell electrolyte, thus still needing to carry out follow-up pump-and-treat system, considerably increasing rehabilitation cost.In addition,
The electrode that electro reclamation selects is often solid tabular or column, and solid tabular electrode surface area is big, and electrode reaction is violent, concentration polarization
Change phenomenon substantially, a large amount of electric energy can be led to be consumed in electrode surface area, and it is big to carry out quantities during field repair, electrode
Installation cost is high；Solid cylindrical electrode has certain advantage in terms of maintaining soil property, reducing energy consumption, but different electricity
The produced Electric Field Distribution that pole configuration produces is different with intensity, necessarily affects the effect of electro reclamation.
Chinese patent literature CN102527707A discloses a kind of reinforced electric repair method of heavy metal contaminated soil, should
The combination electrode of method has the active layer that permeable reactive can occur, and described active layer is fall Fe0, solid-acid material or solid base
Material and optional sorbing material are attached to formation on graphite electrode or the top layer of metal electrode；During repairing,
Control negative electrode pH value not can exceed that a certain particular value, and do not control anode pH value, after reparation finishes, by anode and cathode exchange with
It is in neutrality with soil.The prior art passes through attachment activity material on the graphite electrode at negative and positive the two poles of the earth or the surface of metal electrode
Layer, thus formed that there is the integral type combination electrode of permeable reactivity worth, by the permeable conversion zone of negative electrode, on the one hand can in
The OH producing with the reaction of, adsorption electrode-, it is to avoid negative electrode soil pH value raises and leads to heavy metal prematurely to precipitate in soil；Separately
On the one hand the heavy metal contaminants that migration can be captured and come.But because the electrode surface attachment activity material layer of the prior art is easy
Affect contaminant removal efficiency and the stability of electric current because of active material layer blocking, and this electrode surface attachment activity material
Easily come off.
Content of the invention
Therefore, the technical problem to be solved in the present invention be to overcome of the prior art due to electrode surface attachment activity material
The bed of material easily affects contaminant removal efficiency and the stability of electric current because active material layer blocks, and electrode surface attachment activity
Material holds caducous defect, thus providing a kind of combination electrode for heavy-metal contaminated soil electro reclamation, electro reclamation
Device and electric repair method.
For achieving the above object, the technical solution used in the present invention is as follows：
A kind of combination electrode of the electro reclamation for heavy metal contaminated soil, the netted parcel being made up of conducting medium
Composite constitute, described composite includes modified meerschaum and modification of chitosan.
The mass ratio of described modified meerschaum and described modification of chitosan is 3～10：1.
Described modified meerschaum is to process modification through silane coupler；Or described modified meerschaum is through silane coupled
Agent processes modified and acid treatment is modified and/or heat treatment is modified.
The particle diameter of described modified meerschaum is 20～100 mesh.
Described modification of chitosan is the shitosan through carboxymethyl-modification, to strengthen shitosan absorption complex performance；Institute
The particle diameter stating modification of chitosan is 20～300 mesh；
The netted selected material that described conducting medium is constituted is copper mesh, and it is circle that described copper mesh is laid duct, hole
Footpath is 20～300 mesh.
A kind of electro reclamation device of heavy-metal contaminated soil is it is characterised in that comprise above-mentioned combination electrode.
The electro reclamation device of described heavy-metal contaminated soil is mainly by soil chamber, electrolytic cell and electrolyte conservation tank group
Become, control the heavy-metal contaminated soil moisture content of described soil chamber to be more than 20%, combination electrode is laid in catholyte pond, described
Electrolyte is selected from dilute nitric acid solution, dilute hydrochloric acid solution, citric acid solution, acetum, malic acid solution, oxalic acid solution, methane
Sulfonic acid solutions, ethylene diamine oxalate, terephthalic acid solution or diaminopropionic acid salting liquid one or more, but not office
It is limited to above-mentioned solution.
Also include dc source, ammeter, switch, combination electrode, graphite electrode, described dc source is constant pressure type direct current
Power supply, electrolyte conservation tank and extraction pump, realize following of the electrolyte in electrolyte conservation tank and electrolytic cell using extraction pump
Ring；
Electric-field intensity is 50V/m～600V/m.
A kind of electric repair method of heavy-metal contaminated soil is it is characterised in that adopt above-mentioned combination electrode or above-mentioned
Electro reclamation device.
The original position that described mesh electrode packing material can be regularly replaced to realize electro reclamation heavy-metal contaminated soil removes,
The frequency of described periodic replacement is 15～30d.
Described electric repair method comprises the following steps that：
(1) prepare combination electrode, fill after modified meerschaum and modification of chitosan glycerol polymerization to column copper in proportion
In net, plus electrolyte, in electrolytic cell, uses wire connection device each several part, connects power supply, setting extracting pump discharge；
(2) soil moisture content is controlled to be more than 20%, direct current power source voltage is 100V/m～600V/m, extracting pump discharge is
0.01L/h～0.05L/h, to ensure the operation of device efficient stable；
(3) 2～3 days sampling monitoring electrolytic cells and the change of monitoring point heavy metal concentration, and real time record anode, catholyte
Liquid pH and conductivity variations, are provided with the conductivity threshold of electrolyte, change combination electrode material when electrical conductivity reaches threshold value.
From the point of view of whole process, the heavy metal concentration in electrolyte has first to raise and reduces trend afterwards, monitoring point in soil
Heavy metal concentration have downward trend, show the inventive method complete soil remediation work.
Described threshold value is for arbitrary particular value in the range of 100 μ S/cm-2000 μ S/cm, according to contaminated site buffering of soil
Power, and determined according to the cation exchange capacity (CEC) of soil.This particular value removes removing heavy metals energy to composite electrode active material layer
Power provides early warning, when electrical conductivity is higher than this particular value it is meant that active material layer soon lost efficacy, change.When soil sun
Ion exchange capacity is less, and when catholyte concentration is in 0.1mol/L～0.2mol/L, arranging this conductivity value is 100 μ S/
cm；When Cation Exchange Capacity in Soils is larger, when catholyte concentration is in 0.8mol/L～1mol/L, this conductivity value is set
For 2000 μ S/cm.
Technical solution of the present invention compared with prior art has the advantage that：
1st, the combination electrode that the present invention provides is had and is combined compact, good stability, active material layer with active material layer not
Preferably block, and the effect that heavy metal removal ability is strong.
2nd, control and an absorption huge sum of money of negative electrode pH realized by the combination electrode that the present invention provides by combination electrode packing material
Belong to pollutant, realize the purpose that the original position of heavy metal pollution of soil thing removes.
3rd, compared to traditional board-like solid electrode, mesh electrode surface area wants big 20% to the combination electrode that the present invention provides
～30%.
4th, mesh electrode compared by the combination electrode that the present invention provides, and acutely, concentration polarization phenomenon is obvious for solid electrode reaction,
A large amount of electric energy can be led to be consumed in electrode surface area, surface energy consumption is larger, installation cost is high.
The heavy metal of the combination electrode mesh electrode packing material absorption migration that the 5th, the present invention provides, periodic replacement, convenient
Fast, the original position realizing electro reclamation heavy-metal contaminated soil removes.
What the 6th, the material that the combination electrode mesh electrode that the present invention provides is filled can adsorb migration and arrive is heavy metal-polluted
Dye thing, the original position realizing heavy metal contaminants removes, it is to avoid after the completion of electro reclamation, and follow-up pump-and-treat system catholyte is filled out
Fill the periodic replacement of material, substantially reduce repairing efficiency and rehabilitation cost.
7th, combination electrode, electro reclamation device and the electric repair method that the present invention provides can be by real-time monitoring sun
The change of pH, electrical conductivity and concentration of heavy metal ion near pole, negative electrode, has persistent high efficiency, changes easy, can significantly shorten and repair
Multiple cycle and rehabilitation cost.
Brief description
In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to concrete
In embodiment or description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, below describe in
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not paying creative work
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of prosthetic device schematic diagram of novel electrode heavy metal contaminated soil.
Fig. 2 is Combined electrode schematic diagram of the present invention and top view.
Fig. 3 is the schematic diagram of Combined electrode copper mesh of the present invention.
Accompanying drawing mark is as follows：
1- switchs, 2- dc source, 3- ammeter, 4- electrolyte conservation tank, 5- extraction pump, 6- electrolytic cell, 7- compound electric
Pole, 8- monitoring probe, 9- soil monitoring point, 10- contaminated soil, 11- graphite electrode, 71 copper mesh, 72 modified meerschaums,
73 modification of chitosan.
Specific embodiment
Following embodiments are provided to be to preferably further understand the present invention it is not limited to described optimal embodiment party
Formula, is not construed as limiting to present disclosure and protection domain, anyone under the enlightenment of the present invention or by the present invention and its
Product as any and present invention that the feature of his prior art is combined and draws is same or like, all falls within the present invention's
Within protection domain.
Unreceipted specific experiment step or condition person in embodiment, according to the normal experiment described by document in the art
The operation of step or condition can be carried out.Agents useful for same or the unreceipted production firm person of instrument, be can by city available from
Conventional reagent product.
The soil remediation method of the present invention makes soil moisture content be more than the 20% basic goal of the invention that can meet the present invention, excellent
Soil moisture content is selected on the one hand to can guarantee that being normally carried out of electro reclamation process, on the other hand in 20%-40% in the range of this
Can economize on water, reducing energy consumption.
Embodiment 1. prepares the combination electrode of the electro reclamation for heavy metal contaminated soil
(1) prepare modified meerschaum：Acid treatment is modified, modified Hai Pao that is being heat-treated modified and silane coupler modified gained
The particle diameter of stone is 20～100 mesh.
Acid treatment is modified：
With 1mol/L HCl, sepiolite is modified, solid-to-liquid ratio is 1:10 (if sepiolite 10g, HCl 100ml).?
Temperature is oscillation treatment 6h in 50 DEG C of constant temperature oscillator, is centrifuged 10min separation water in rotating speed is for the centrifuge of 4000r/min
And sepiolite, plus deionized water washing, centrifugation, it is 6 about that repeated washing is centrifuged 3～5 times to pH value.Centrifugation is rearmounted
In temperature be 50 DEG C drier in be dried.
Heat treatment is modified：By the sepiolite modified through peracid through 450 DEG C of high-temperature roasting 4h, being subsequently placed in temperature is 50
DEG C drier in be dried.
Silane coupler modified：Weigh a certain amount of silane coupler, the second of be then 3～5 with the pH of 100mL 95%
Alcoholic solution is sufficiently mixed stirring 30min, obtains silane-water solution.Weigh the sepiolite through peracid treatment is modified and heat treatment is modified
By solid-to-liquid ratio 1:10 addition distilled water, after ultrasonic disperse, import in there-necked flask, stirring simultaneously water-bath the pre-heat treatment 30min.So
Afterwards hydrolyzed silane solution is imported in there-necked flask, back flow reaction 100min at 70 DEG C, and be stirred continuously, reacted material will be completed
With absolute ethyl alcohol and distillation water washing after slurry suction filtration, remove unreacted coupling agent.Suspension again through suction filtration, drying, levigate i.e.
Obtain silane-modified sepiolite.
(2) prepare modification of chitosan：Shitosan carboxymethyl modified：15g shitosan is first molten in 50% (mass ratio) NaOH
In liquid alkalize, then plus 150mL isopropanol stirring, add 18g monoxone, 65 DEG C react 2h, be neutralized with hydrochloric acid to pH be 7,
70% (mass ratio) methyl alcohol repeatedly washs, and is then dissolved in water, then with acetone precipitation, filters, use absolute ethyl alcohol cyclic washing, mistake
Filter, vacuum drying obtains carboxymethyl chitosan.
The particle diameter of the modification of chitosan obtained by the present embodiment is 20～300 mesh.
(3) glycerol polymerization：Mass ratio is 3～10：1 modified meerschaum and modification of chitosan glycerol polymerization.Grafting is poly-
Close concrete steps：Weigh 0.5g carboxymethyl-modification shitosan, add the acetic acid solution of 5% (mass ratio), be heated to 50 DEG C simultaneously
Add the hexandial solution of 0.2ml, stirring standing 30min, be subsequently adding 0.08g (the 15% of Carboxymethyl chitosan quality) nitre
The salpeter solution 5ml of sour cerium ammonium, is subsequently added 1.5g sepiolite, and after 80 DEG C of reaction 2h, adjusting pH with the NaOH of 1mol/L is
7, obtain white precipitate.Precipitation is inserted in acetone soln, filters washing after stirring 30min, then soaked with watery hydrochloric acid and remove
Unreacted shitosan, washing, drying, obtain graft polymers.
(4) fill：The graft polymers of step (3) gained is uniformly mixed filling to column copper mesh, copper mesh is laid
Duct is circular aperture is 20～300 mesh.
The electro reclamation device (1) that embodiment 2. prepares heavy-metal contaminated soil prepares electrolyte：Our department belongs to existing
Technology, such as with the HNO of 0.2mol/L3As electrolyte.
Concrete preparation process is as follows：Add red fuming nitric acid (RFNA) in a certain amount of water, be configured to the HNO of 0.2mol/L3.
(2) add electrolyte in electrolytic cell, with wire connection device combination electrode, graphite electrode, dc source, switch
Deng part, connect power supply, setting extracting pump discharge is 0.01～0.05L/h.
(3) allocate：Control soil moisture content to be more than 20%, direct current power source voltage 100V/m～600V/m, extract pump discharge
For 0.01～0.05L/h it is ensured that device efficient stable runs.
Embodiment 3. uses the combination electrode of embodiment 1 and the electro reclamation device repairing heavy metal pollution of embodiment 2
Soil
Concrete operation step is as follows：
The combination electrode made is inserted in electrolytic cell, in electrolytic cell, is passed through electrolyte, circuit communication combination electrode,
Graphite electrode, switch, ammeter, open extraction pump, are then repaired.
Periodic monitoring electrolytic cell and the change of monitoring point heavy metal concentration, and real time record anode, catholyte pH and electricity
Conductance changes, and changes combination electrode material when electrical conductivity exceedes a certain special value.
Test example 1
Certain smelting iron and steel enterprises remove, stays contaminated site to need to repair, further investigation reveals that, in soil, major pollutants are
Heavy metal, based on Cu, Pb, Zn, Cd, pollution depth is 1.8m.After site investigation, select electro reclamation unit, using this
The combination electrode that inventive method is obtained, design parameter is：Column copper mesh selects a diameter of 20cm, highly for 1.8m, copper mesh mesh number
For 200 mesh.Composite is according to 150:50 mass ratioes uniformly mix filling to column copper mesh.Setting electrolytic cell is long：Wide：Depth
For 30cm × 30cm × 1.8m, soil chamber is long：Wide：Depth is 3m × 3m × 1.8m.Place election electrolyte is 0.2mol/L lemon
Lemon acid, setting contaminated soil moisture content reaches 36%, and electric-field intensity is 100V/m, and anode selects column graphite electrode, electrolyte
Conductivity threshold be 120 μ S/cm.Operating procedure according to the present invention requires, and connects each several part, switches on power, periodic monitor
The change in concentration of anode, negative electrode and soil interior heavy metal, real time record anode, negative electrode pH change, after repairing 32d, after testing
Heavy metal in soil clearance reaches 86%.
Test example 2
Certain smelting iron and steel factory moves, and stays contaminated site to need to repair, further investigation reveals that, in soil, major pollutants are attached most importance to
Metal, based on Cu, Pb, Zn, Cd, pollution depth is 1.6m.The combination electrode being obtained using the inventive method, design parameter
For：Column copper mesh selects a diameter of 20cm, and highly for 1.6m, copper mesh mesh number is 20 mesh.Composite is according to 300:30 mass ratioes
Uniformly mixing filling is to column copper mesh.Setting electrolytic cell is long：Wide：Depth is 30cm × 30cm × 1.6m, and soil chamber is long：Wide：
Depth is 2m × 2m × 1.6m.Place election electrolyte is 0.5mol/L watery hydrochloric acid, and setting contaminated soil moisture content reaches 20%,
Electric-field intensity is 600V/m, and anode selects column graphite electrode, and the conductivity threshold of electrolyte is 1000 μ S/cm.According to this
Bright operating procedure requires, and connects each several part, switches on power, the concentration of periodic monitor anode, negative electrode and soil interior heavy metal
Change, real time record anode, negative electrode pH change, after repairing 28d, heavy metal in soil clearance reaches 89% after testing.
Test example 3
Certain smelting iron and steel factory moves, and stays contaminated site to need to repair, further investigation reveals that, in soil, major pollutants are attached most importance to
Metal, based on Cu, Pb, Zn, Ni, pollution depth is 1.2m.The combination electrode being obtained using the inventive method, design parameter
For：Column copper mesh selects a diameter of 20cm, and highly for 1.2m, copper mesh mesh number is 300 mesh.Composite is according to 150:30 mass ratioes
Uniformly mixing filling is to column copper mesh.Setting electrolytic cell is long：Wide：Depth is 30cm × 30cm × 1.2m, and soil chamber is long：Wide：
Depth is 1.5m × 1.5m × 1.2m.Place election electrolyte is 0.7mol/L citric acid, and setting contaminated soil moisture content reaches
40%, electric-field intensity is 50V/m, and anode selects column graphite electrode, and the conductivity threshold of electrolyte is 1400 μ S/cm.According to
The operating procedure of the present invention requires, and connects each several part, switches on power, periodic monitor anode, negative electrode and soil interior heavy metal
Change in concentration, real time record anode, negative electrode pH change, after repairing 30d, heavy metal in soil clearance reaches 90% after testing.
Test example 4
Certain smelting iron and steel factory moves, and stays contaminated site to need to repair, further investigation reveals that, in soil, major pollutants are attached most importance to
Metal, based on Cu, Pb, Zn, Cd, pollution depth is 1.7m.The combination electrode being obtained using the inventive method, design parameter
For：Column copper mesh selects a diameter of 20cm, and highly for 1.7m, copper mesh mesh number is 20 mesh.Composite is according to 300:30 mass ratioes
Uniformly mixing filling is to column copper mesh.Setting electrolytic cell is long：Wide：Depth is 25cm × 25cm × 1.7m, and soil chamber is long：Wide：
Depth is 2m × 2m × 1.7m.Place election electrolyte is 1mol/L watery hydrochloric acid, and setting contaminated soil moisture content reaches 50%, electricity
Field intensity is 600V/m, and anode selects column graphite electrode, and the conductivity threshold of electrolyte is 2000 μ S/cm.According to the present invention
Operating procedure require, connect each several part, switch on power, periodic monitor anode, negative electrode and soil interior heavy metal concentration become
Change, real time record anode, negative electrode pH change, after repairing 28d, heavy metal in soil clearance reaches 90% after testing.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.Right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (12)
1. a kind of combination electrode of the electro reclamation for heavy metal contaminated soil is it is characterised in that be made up of conducting medium
The composite of netted parcel constitute, described composite includes modified meerschaum and modification of chitosan.
2. combination electrode according to claim 1 is it is characterised in that described modified meerschaum and described modification of chitosan
Mass ratio is 3～10：1.
3. combination electrode according to claim 2 is it is characterised in that described modified meerschaum is at silane coupler
Reason is modified；Or described modified meerschaum is to process modified through silane coupler and acid treatment is modified and/or heat treatment is modified.
4. combination electrode according to claim 3 is it is characterised in that the particle diameter of described modified meerschaum is 20～100 mesh.
5. combination electrode according to claim 4 is it is characterised in that described modification of chitosan is through carboxymethyl-modification
Shitosan, with strengthen shitosan absorption complex performance；The particle diameter of described modification of chitosan is 20～300 mesh；
The netted selected material that described conducting medium is constituted is copper mesh, and it is circle that described copper mesh is laid duct, and aperture is
20～300 mesh.
6. a kind of electro reclamation device of heavy-metal contaminated soil is it is characterised in that comprise arbitrary described the answering of claim 1-5
Composite electrode.
7. electro reclamation device according to claim 6 is it is characterised in that be mainly by soil chamber, electrolytic cell and electrolysis
Liquid conservation tank forms, and controls the heavy-metal contaminated soil moisture content of described soil chamber to be more than 20%, combination electrode is laid in negative electrode
Electrolytic cell, described electrolyte is selected from dilute nitric acid solution, dilute hydrochloric acid solution, citric acid solution, acetum, malic acid solution, grass
Acid solution, Loprazolam solution, one kind of ethylene diamine oxalate, terephthalic acid solution or diaminopropionic acid salting liquid or one kind
More than.
8. electro reclamation device according to claim 7 it is characterised in that also include dc source, ammeter, switch,
Combination electrode, graphite electrode, described dc source is constant pressure type dc source, electrolyte conservation tank and extraction pump, using extracting
Pump is to realize the circulation of the electrolyte in electrolyte conservation tank and electrolytic cell；
Electric-field intensity is 50V/m～600V/m.
9. a kind of electric repair method of heavy-metal contaminated soil is it is characterised in that using arbitrary described the answering of claim 1-5
Composite electrode or the arbitrary described electro reclamation device of claim 6-8.
10. electric repair method according to claim 9 is it is characterised in that described mesh electrode filling can be regularly replaced
Material is removed with the original position realizing electro reclamation heavy-metal contaminated soil, and the frequency of described periodic replacement is 15～30d.
11. electric repair methods according to claim 10 are it is characterised in that comprise the following steps that：
(1) prepare combination electrode, will fill after modified meerschaum and modification of chitosan glycerol polymerization to column copper mesh in proportion,
Plus electrolyte is in electrolytic cell, use wire connection device each several part, connect power supply, setting extracting pump discharge；
(2) soil moisture content is controlled to be more than 20%, direct current power source voltage is 100V/m～600V/m, extracting pump discharge is 0.01L/
H～0.05L/h, to ensure the operation of device efficient stable；
(3) 2～3 days sampling monitoring electrolytic cells and the change of monitoring point heavy metal concentration, and real time record anode and catholyte
PH and conductivity variations, are provided with the conductivity threshold of electrolyte, change electrode material when electrical conductivity reaches described threshold value.
12. electric repair methods according to claim 11 are it is characterised in that described threshold value is for 100 μ S/cm-2000 μ
Any value in the range of S/cm.
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| CN109731905A (en) * | 2019-03-01 | 2019-05-10 | 长江水利委员会长江科学院 | A kind of autonomous controllably soil or the electronic acidification device for dissociation of pollutants in sediments and method |
| CN109987818A (en) * | 2019-04-11 | 2019-07-09 | 浙江广川工程咨询有限公司 | A kind of mud modification-reparation integrated system and application based on electrochemical treatments |
| CN110355198A (en) * | 2019-08-09 | 2019-10-22 | 东华大学 | A kind of catholyte for electro reclamation heavy-metal contaminated soil |
| CN110402632A (en) * | 2019-07-08 | 2019-11-05 | 王帘里 | A kind of comprehensive processing method of beach saline land |
| CN110479752A (en) * | 2019-07-08 | 2019-11-22 | 南京迪天高新产业技术研究院有限公司 | A kind of electric repair method for hyposmosis contaminated soil |
| CN112538355A (en) * | 2020-12-07 | 2021-03-23 | 安徽龙码数据科技有限公司 | Long-acting soil remediation agent and preparation method thereof |
| CN112718842A (en) * | 2020-11-18 | 2021-04-30 | 上海清宁环境规划设计有限公司 | Supplementary chelant and device of quick processing soil heavy metal ion of power supply in coordination |
| CN115838595A (en) * | 2021-10-19 | 2023-03-24 | 淮阴师范学院 | Combined remediation process for heavy metal contaminated soil |
| CN116251832A (en) * | 2023-01-14 | 2023-06-13 | 西安建筑科技大学 | Method and system for electrically repairing heavy metal contaminated soil by cementing and strengthening biocatalyst |
| CN117548477A (en) * | 2024-01-12 | 2024-02-13 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
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| CN116251832B (en) * | 2023-01-14 | 2024-05-14 | 西安建筑科技大学 | Method and system for electrically repairing heavy metal contaminated soil by cementing and strengthening biocatalyst |
| CN117548477A (en) * | 2024-01-12 | 2024-02-13 | 自然资源部第二海洋研究所 | Sediment heavy metal pollution restoration method |
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