CN106334710A - Method for successive and directional enrichment of heavy metals in tailing sand or soil contaminated by tailing sand - Google Patents
Method for successive and directional enrichment of heavy metals in tailing sand or soil contaminated by tailing sand Download PDFInfo
- Publication number
- CN106334710A CN106334710A CN201510412064.7A CN201510412064A CN106334710A CN 106334710 A CN106334710 A CN 106334710A CN 201510412064 A CN201510412064 A CN 201510412064A CN 106334710 A CN106334710 A CN 106334710A
- Authority
- CN
- China
- Prior art keywords
- soil
- electrode
- anode
- heavy metal
- tailings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
The invention relates to enrichment and extraction technology method for heavy metals in tailing sand or soil contaminated by tailing sand, specifically to a method for successive and directional enrichment of heavy metals in virtue of anodic acidification. According to the method, two ends of soil contaminated by heavy metals are provided with negative and positive electrodes, wherein the positive electrode is a movable electrode while the negative electrode is a fixed electrode; direct current is applied to two ends of the soil; after energizing current is constant, the positive electrode is moved towards the fixed negative electrode located at the other end for a certain distance; heavy metals in soil are allowed to migrate to the negative electrode and to be enriched successively and directionally in virtue of the effect of anodic acidification; and the voltage of the negative and positive electrodes is not changed in the whole process, and the gradient range of voltage is 1.37 to 6.85 V/cm. The method provided by the invention can rapidly enrich heavy metals in soil, exerts obvious enrichment effect on heavy metals of various forms, and enables 40% of energy to be saved compared with a fixed-electrode enrichment method.
Description
Technical field
The present invention relates to heavy metal accumulation extractive technique, specifically one kind gradually orienting enriching CHARACTERISTICS OF TAILINGS SAND or
The method of tailings pollution heavy metal in soil.
Background technology
Heavy metal pollution of soil problem is the main environmental problem of current China.Heavy metal difficult degradation, easily
Accumulation, toxicity are big, and the growth of crop, yield and quality are all had an impact, and especially it also has and is made
Thing is absorbed into food chain, thus the potential threat being detrimental to health.Environmental Protection Department and land resources
Portion has issued national Soil Pollution Investigation publication, and exceeded digit of inorganic pollution accounts for all exceeded
The 82.8% of point position.In terms of the exceeded situation of pollutant, cadmium, hydrargyrum, arsenic, copper, lead, chromium, zinc, nickel 8
Kind of inorganic pollution object point position exceeding standard rate is respectively 7.0%, 1.6%, 2.7%, 2.1%, 1.5%, 1.1%,
0.9%th, 4.8%.The grain heavy metal pollution thereby resulting in, direct economic loss is huge.
Treatment process currently for heavy metal pollution of soil and measure mainly have the following aspects: one
It is that heavy metal in soil is extracted, mainly by modes such as chemical leachings, by the chela of medicament
Close and desorption, make part leaching ability of heavy metal in soil；Two be heavy metal in soil is carried out solidify/
Stabilisation, is by firming agent/stabilization agent, makes heavy metal valence state, form generation change.Reduce
Its animal migration in soil, reduces bio-toxicity.Integrated comparative, from soil, directly enrichment is extracted
Out, it is the thorough measure solving heavy metal pollution, the especially heavy-metal contaminated soil to high concentration,
Even more important.
Content of the invention
Present invention aim at providing a kind of orienting enriching CHARACTERISTICS OF TAILINGS SAND or tailings pollution heavy metal in soil
Method.
For achieving the above object, the technical solution used in the present invention is:
A kind of gradually orienting enriching CHARACTERISTICS OF TAILINGS SAND or the method for tailings pollution heavy metal in soil, pending
CHARACTERISTICS OF TAILINGS SAND or tailings pollution pedotheque both sides are respectively provided with fixing cathode electrode and moveable anode
Electrode, connecting unidirectional current makes pending sample reach constant current, voltages keep constant simultaneously, and to
Add electrolyte in pending sample, treat anode region soil ph 2-4, make in soil in many-sided effect
Grain disintegrates, oxide dissolves, precipitate morphology heavy metal dissolves, ADSORPTION STATE heavy metal desorbing, transportable
Property strengthen, then by anode electrode to fixed negative pole electrode direction move 5～7cm, using anode acidifying
Effect makes in pending sample heavy metal gradually directionally to cathodic migration and be enriched with.
Described voltage gradient scope is 1.37～6.85v/cm；Constant current is maintained at 40-100ma.
Described electrolyte is NaAc_HAc buffer solution.
Device includes soil treating chamber, electrode chamber, electrode, power control system and current/voltage monitoring
System, described soil treating chamber is separated by porous lucite respectively between anode chamber and cathode chamber,
Described negative electrode interior is provided with fixed negative pole electrode, and anode interior is provided with moveable anode electrode；Described
It is connected with power supply by wire between cathode and anode.
The mechanism of action of the present invention: after processed soil two ends apply DC electric field, because anode is continuous
Move to cathode direction, the electric field intensity between negative electrode and anode is gradually increased, simultaneously anode electricity nearby
Solution produces substantial amounts of hydrion and migrates to cathode direction under electric field action, and hydrion is in soil
Translational speed be about 2 times hydroxy, can lead to entirely to process soil and be in a relatively low ph
Under environment.A large amount of hydrions that water electrolysis near anode produces, by ion exchange by soil
Particle surface absorption a large amount of cationes desorb, increase the soil liquid in number of charged particles from
And increase the electrical conductivity of soil, be conducive to the desorption of the heavy metal ion that soil particle surface adsorbed；
Relatively low ph environment is beneficial in soil with the dissolution of ion or the heavy metal of precipitation form presence；Due to
Anode is gradually reduced with cathode spacing, and two interpolar electric field intensity are gradually increased, be conducive to improve metal from
Son migration velocity under the electric field, thus improve the concentration level of heavy metal in soil.
Advantage for present invention:
1st, the present invention adopts anode irregularly to the method gradually orienting enriching heavy metal of movable cathode, can
Simple, cheap pretreatment as a kind of other chemically or physically processing methods of heavy-metal contaminated soil
Mode is it is adaptable to dystopy CHARACTERISTICS OF TAILINGS SAND or tailings pollution heavy metal-polluted soil extract；
2nd, the present invention is by controlling time of anode movement and mode, effective control soil acidification process,
Be conducive to the dissolution of heavy metal, desorbing that precipitation form in contaminated soil exists and its in the soil liquid
Migration, and then make the enrichment of heavy metal in soil have controllability.
3rd, the present invention can be not only used for the showering of heavy-metal contaminated soil it can also be used to in-situ immobilization,
It is particularly suited for the reparation of heterogeneous soil.
4th, the present invention has universality, all suitable to most heavy metals.
Brief description
The experimental provision sketch that Fig. 1 is adopted by the embodiment of the present invention.
Fig. 2 is diverse location heavy metal concentration in the embodiment of the present invention 1 CHARACTERISTICS OF TAILINGS SAND enrichment process.
Fig. 3 is diverse location soil sample ph- time variation diagram during the embodiment of the present invention 2 enrichment experiment.
Fig. 4 is diverse location soil sample ph- time variation diagram during the embodiment of the present invention 3 enrichment experiment.
Fig. 5 terminates rear diverse location soil sample cr () content for the embodiment of the present invention 3 enrichment experiment and divides
Butut.
Specific embodiment
With reference to specific embodiment and coordinate accompanying drawing to be described further with regard to the present invention.
The present invention utilizes anode acidifying gradually orienting enriching heavy metal in soil, indeed through electric field
Effect, the heavy metal ion (such as pb, cd, cr, zn etc.) in soil blends electromigration thoroughly by electricity
Mode to electrode transport, carry out centralized collection process after enrichment.By soil treating chamber's setting cloudy,
Anelectrode, anode a large amount of hydrions that nearby water electrolysis produces to cathodic migration, make under electric field action
Anode soil acidification nearby, soil particle dissolves, and heavy metal is from the knot of the difficult ADSORPTION STATE migrating and indissoluble
Close state and change into the form of easy migration to cathode direction migration.After anode region soil ph is less than a certain value,
Anode electrode is moved to fixed negative pole electrode direction, makes the huge sum of money in soil using anode acidization
Belong to and gradually orienting to cathodic enrichment.
The heavy metal accumulation device being adopted by the embodiment of the present invention as shown in Figure 1, device mainly wraps
Include soil extract groove, electrode chamber, electrode, power control system and current/voltage monitoring system.In soil
Earth extraction tank two ends anodic-cathodic room inserts cathode electrode and anode electrode respectively, and cathode electrode is to fix
Electrode, anode electrode is travelling electrode, is connected with power supply by wire between two electrodes.
The The concrete specification of soil treating chamber is as follows: long 35cm, wide 10cm, high 10cm.Electrode is equal
For hard graphite plate electrode, long 10cm, wide 1cm, high 10cm.
Embodiment 1
Heavy metal accumulation extraction, ore in sand form are carried out to certain nonferrous metal mine organism exposure test using the method
In sample, the concentration of cu, pb, zn and cd is respectively 182mg kg-1, 182mg kg-1, 182mg kg-1,
With 182mg kg-1.Apply 48v DC voltage, enrichment time is 48h, and period is irregularly to place
Appropriate 0.1mol l is added in reason sample-1Sodium chloride solution balances its moisture as electrolyte simultaneously and damages
Lose.After system power basically reaches constant current and anode region soil ph is less than 4, may move sun
7cm is moved to cathode direction in pole, and result is referring to Fig. 2.
After processing 48h as seen from Figure 2, the heavy metal majority in ore in sand form is enriched to cathode chamber.
Embodiment 2
Enrichment experiment is carried out to simulation cd contaminated soil (Kaolin) using the method, cd concentration is
182mg·kg-1.Apply 48v DC voltage, enrichment time is 48h, and period is irregularly to process
Appropriate 0.1mol l is added in soil-1Sodium chloride solution as electrolyte simultaneously balanced soil moisture damage
Lose.After system power basically reaches constant current and anode region soil ph is less than 4, may move sun
7cm is moved to cathode direction in pole, and result is referring to Fig. 3.
Soil ph value as seen from Figure 3: respectively in energising 5h, 10h, 18h, 24h, 48h soil
Earth diverse location ph change such as accompanying drawing 3, constantly moves to cathode direction with anode, processed soil
Gradually it is acidified.In addition to negative electrode soil, other regional soil ph are below 2.68.The method is passed through to control sun
Ghandler motion move time and mode, can effective control soil acidification process, make soil ph be in suitable model
In enclosing.
Soil cd content distribution everywhere: after processing 48h, in soil, more than 95% cd is enriched to the moon
In the soil of pole.Compared with processing with fixed electrode under the conditions of same operation, the method can save energy consumption 40%
Left and right.
Embodiment 3
Using the method to cr () content be 907.11mg kg-1Contaminated soil in chromium carry out richness
Collection experiment.Apply 48v DC voltage, enrichment time is 15 days, period is irregularly to process soil
The appropriate 0.1mol l of middle addition-1Sodium chloride solution is as the moisture loss of electrolyte balanced soil simultaneously.
After system power basically reaches constant current and anode region soil ph is less than 4.6, removable anode
Move 7cm to cathode direction, result is referring to Fig. 4.
From fig. 4, it can be seen that soil ph value: respectively in energising 3 days, 6 days, 9 days, 12 days, 15 days
Afterwards, soil diverse location ph change such as accompanying drawing 4, constantly moves to cathode direction with anode, is located
Reason soil is gradually acidified.Anode region soil ph is all down to less than 2.0, other regions in addition to negative electrode soil
Soil ph is below 4.5.
Soil cr () content distribution everywhere: after processing 15 days, cr () content distribution such as accompanying drawing
5, in soil, more than 50% chromium is enriched in negative electrode soil.Found by morphological analyses, except enrichment region
, all based on residual form, environmental risk is extremely low for chromium in other processing region soil outer.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not subject to
State the restriction of embodiment, that is made under other any spirit without departing from the present invention and principle changes
Become, modify, substitute, combine, simplify, all should be equivalent substitute mode, be included in the present invention
Protection domain within.
Claims (4)
1. a kind of method of gradually orienting enriching CHARACTERISTICS OF TAILINGS SAND or tailings pollution heavy metal in soil, its feature
It is: be respectively provided with fixing cathode electrode in pending CHARACTERISTICS OF TAILINGS SAND or tailings pollution pedotheque both sides
With moveable anode electrode, connecting unidirectional current makes pending sample reach constant current, keeps simultaneously
Constant voltage, and add electrolyte in pending sample, treat anode region soil ph 2-4, in many-side
Effect makes granule in soil disintegrate, oxide dissolves, precipitate morphology heavy metal dissolves, an ADSORPTION STATE huge sum of money
Belong to desorbing, transportable property strengthens, then by anode electrode to fixed negative pole electrode direction mobile 5～7
Cm, makes in pending sample heavy metal gradually directionally to cathodic migration simultaneously using anode acidization
Enrichment.
2. gradually orienting enriching CHARACTERISTICS OF TAILINGS SAND or tailings pollution heavy metal in soil as described in claim 1
Method it is characterised in that: described voltage gradient scope be 1.37～6.85v/cm；Constant current keeps
In 40-100ma.
3. gradually orienting enriching CHARACTERISTICS OF TAILINGS SAND or tailings pollution heavy metal in soil as described in claim 1
Method it is characterised in that: described electrolyte be NaAc_HAc buffer solution.
4. heavy be applied to gradually orienting enriching CHARACTERISTICS OF TAILINGS SAND or tailings pollution soil as described in claim 1
The device of metal process it is characterised in that: device includes soil treating chamber, electrode chamber, electrode, electricity
Source control system and current/voltage monitoring system, between described soil treating chamber and anode chamber and cathode chamber
Pass through porous lucite respectively separately, described negative electrode interior is provided with fixed negative pole electrode, anode is indoor
It is provided with moveable anode electrode；It is connected with power supply by wire between described cathode and anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510412064.7A CN106334710A (en) | 2015-07-13 | 2015-07-13 | Method for successive and directional enrichment of heavy metals in tailing sand or soil contaminated by tailing sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510412064.7A CN106334710A (en) | 2015-07-13 | 2015-07-13 | Method for successive and directional enrichment of heavy metals in tailing sand or soil contaminated by tailing sand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106334710A true CN106334710A (en) | 2017-01-18 |
Family
ID=57826010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510412064.7A Pending CN106334710A (en) | 2015-07-13 | 2015-07-13 | Method for successive and directional enrichment of heavy metals in tailing sand or soil contaminated by tailing sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106334710A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108326030A (en) * | 2018-01-11 | 2018-07-27 | 上海理工大学 | The heavy metal-polluted soil prosthetic device of convertible array-type electrode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100998988A (en) * | 2006-01-13 | 2007-07-18 | 南京大学 | Direct current and variable electric field restoring method of polluted kaolin and montmorillonite |
| CN102941217A (en) * | 2012-11-15 | 2013-02-27 | 华北电力大学 | Electric power repairing device and method for cylindrical arrangement electrode |
| CN103896468A (en) * | 2014-03-28 | 2014-07-02 | 浙江大学 | Device for electrochemically removing and recycling heavy metals in solid waste |
| CN103962372A (en) * | 2014-05-20 | 2014-08-06 | 华北电力大学 | Device and method for repairing caesium contaminated soil with cathode approximation method |
| CN104174648A (en) * | 2014-08-21 | 2014-12-03 | 中国科学院生态环境研究中心 | Method for repairing heavy metal polluted soil and special equipment thereof |
-
2015
- 2015-07-13 CN CN201510412064.7A patent/CN106334710A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100998988A (en) * | 2006-01-13 | 2007-07-18 | 南京大学 | Direct current and variable electric field restoring method of polluted kaolin and montmorillonite |
| CN102941217A (en) * | 2012-11-15 | 2013-02-27 | 华北电力大学 | Electric power repairing device and method for cylindrical arrangement electrode |
| CN103896468A (en) * | 2014-03-28 | 2014-07-02 | 浙江大学 | Device for electrochemically removing and recycling heavy metals in solid waste |
| CN103962372A (en) * | 2014-05-20 | 2014-08-06 | 华北电力大学 | Device and method for repairing caesium contaminated soil with cathode approximation method |
| CN104174648A (en) * | 2014-08-21 | 2014-12-03 | 中国科学院生态环境研究中心 | Method for repairing heavy metal polluted soil and special equipment thereof |
Non-Patent Citations (2)
| Title |
|---|
| 何连生等: "《重金属污染调查与治理技术》", 31 December 2013, 中国环境科学出版社 * |
| 郑燊燊等: "逼近阳极法电动力学修复重金属污染土壤", 《农业环境科学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108326030A (en) * | 2018-01-11 | 2018-07-27 | 上海理工大学 | The heavy metal-polluted soil prosthetic device of convertible array-type electrode |
| CN108326030B (en) * | 2018-01-11 | 2020-11-24 | 上海理工大学 | Soil heavy metal prosthetic devices of convertible array electrode |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Almeira et al. | Simultaneous removal of cadmium from kaolin and catholyte during soil electrokinetic remediation | |
| Zhou et al. | Removal of cadmium in contaminated kaolin by new-style electrokinetic remediation using array electrodes coupled with permeable reactive barrier | |
| CN201454977U (en) | Electrokinetic adsorbing and compounding remediation device for heavy metal polluted soil | |
| CN110180886B (en) | Device and method for in-situ remediation of fluorine-contaminated soil | |
| Yuan et al. | Use of solar cell in electrokinetic remediation of cadmium-contaminated soil | |
| CN201454978U (en) | Heavy metal polluted soil electrokinetic adsorbing and compounding remediation device for plants | |
| CN110420983B (en) | Method and system for combined leaching, adsorption and electrokinetic remediation of heavy metal contaminated soil | |
| CN101786099A (en) | Electrodynamic method for removing fluorine contaminant in soil | |
| Wu et al. | Chloride ion removal from zinc sulfate aqueous solution by electrochemical method | |
| CN103406347B (en) | One can be used for heavy metal and organic method in Enriching soil | |
| CN102513344A (en) | Novel method for remedying heavy-metal contaminated soil with electrodynamics | |
| CN201511038U (en) | Electromotive power chromium pollution soil restoration device | |
| CN110947751B (en) | Device and method for restoring cadmium-polluted soil through electric auxiliary leaching | |
| Zhou et al. | Pulse-enhanced electrokinetic remediation of fluorine-contaminated soil | |
| CN106424117B (en) | Mantoquita strengthens cathode electro reclamation heavy-metal contaminated soil device | |
| CN109719122A (en) | The processing method and processing device of heavy metal ion in a kind of removal soil (water body) with adsorbent | |
| CN109513741A (en) | Device and restorative procedure for repairing polluted soil | |
| CN112676336A (en) | Method for repairing heavy metal contaminated soil by using primary battery driving technology | |
| CN106914486B (en) | Electric remediation device and electric remediation method for heavy metal contaminated soil | |
| CN108212161A (en) | A kind of activated carbon fibre three dimensional particles electrode catalyst and preparation method thereof | |
| CN113549775B (en) | Method for extracting lithium from clay type lithium ore | |
| CN106334710A (en) | Method for successive and directional enrichment of heavy metals in tailing sand or soil contaminated by tailing sand | |
| CN105728456B (en) | A method of improving contaminated soil Electroremediation efficiency | |
| CN108862487A (en) | A kind of water treatment system and technique | |
| CN206153283U (en) | Nanometer zero -valent iron nickel drip washing electrodynamics restores device that ground soil was put to chromium slag muck |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170118 |
|
| RJ01 | Rejection of invention patent application after publication |