CN102500610A - Electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method - Google Patents
Electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method Download PDFInfo
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- CN102500610A CN102500610A CN2012100009647A CN201210000964A CN102500610A CN 102500610 A CN102500610 A CN 102500610A CN 2012100009647 A CN2012100009647 A CN 2012100009647A CN 201210000964 A CN201210000964 A CN 201210000964A CN 102500610 A CN102500610 A CN 102500610A
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Abstract
The invention discloses an electrodynamic and drop-irrigation combined heavy-metal-polluted soil remediation method. The method comprises the following steps of: mounting positive and negative electrodes at the two ends of heavy-metal-polluted soil, wherein the positive and negative electrodes are made from carbon fibers; respectively placing adsorbents between the positive electrode and the polluted soil and between the negative electrode and the polluted soil; placing a drop irrigation device above soil close to the absorbents; slowly dropwise adding electrolyte, buffer solution or a complexing agent and the like into the polluted soil at the two sides, and carrying out periodic polarity switching, wherein heavy metal moves under the action of electric migration and is adsorbed by the adsorbents, thus concentration of the heavy metal in the soil is reduced. According to the invention, drop irrigation technology is applied to polluted soil electric remediation, a complex anode chamber, a complex cathode chamber and an electrolyte circulating system in the traditional electrodynamic remediation are not used, a proper amount of drop irrigation liquid is reserved in the soil, electrolyte and secondary pollution are effectively avoided, and the method disclosed by the invention has the advantages of simple structure, operation convenience, practicability, effectiveness and the like.
Description
Technical field
The present invention relates to a kind of environmental pollution improvement method, particularly a kind of processing method of heavy-metal contaminated soil.
Background technology
Electrodynamics is a kind of green new technology of repairing that soil and groundwater environment are repaired; Can be used for removing some organic pollutions and heavy metal ion, have Environmental compatibility, multi-functional applicability, high selectivity, be suitable for automation control, characteristics such as operating cost is low.In electronic repair process, directional migration takes place in metal and charged ion under effect of electric field, focuses at the treatment region of setting then.The conventional electric renovation technique needs two fluid circulation systems usually: one is used for negative electrode, and one is used for anode.Pump fluid returns the holding vessel through the conduit that is connected with electrode chamber and from electrode chamber from storage tank, sends into the acid of circulating fluid or the pH that alkali flows control cathode or anode through control from storage tank.Measure commonly used also comprises and the cushioning liquid district is set and selective membrane etc. is set around electrode; These measures can improve the removal of heavy metal to a certain extent; But a large amount of chemical reagent that add cause secondary pollution easily in soil; And device structure more complicated, operating cost is higher, complicated operation.
In addition, in the electronic repair process of soil, electrode reaction causes near the soil solidification of electrode easily; If when soil initial aqueous rate is low, can cause electromigration and EOF effect all very little, contaminant removal efficiency is very low; For reaching treatment effect, need usually to prolong the processing time and increase voltage etc.
Aspect electrode, that electrodes such as precious metals pt, Au have is stable, corrosion-resistant, catalytic activity good but cost is high.Graphite is for electrode material commonly used, and is cheap, but bad mechanical strength.The more important thing is that hardboard shape or columnar electrode plate can not contact with the soil end face fully, electric energy loss is greatly arranged on electrode and Soil Interface resistance, so practical function is much little at the output voltage of the power of voltage ratio at soil two ends.
The existence of complicated electrolyte circulation system in the electronic repair process of above-mentioned soil, electrode contact resistance and extremely low problems such as current efficiency seriously restricted should technology apply, be difficult to be fit to large-scale open-air the reparation.
Drip irrigation technique has become one of irrigation technique of current traditional agriculture high-efficiency water-saving, and it is the localized irrigation's technology with near water soil drip irrigation system and water-dropper evenly and lentamente splash into plant root.In recent years, drip irrigation technique is being obtained the effect of highly significant aspect the highway bridge health water saving, but is not applied to the report that contaminated soil is repaired.
Summary of the invention
The present invention is for solving a kind of electrodynamics, drip irrigation and the adsorbent renovation of heavy metal polluted soil with combined method of the technical problem proposition that exists in the known technology; It is characterized in that installation positive and negative electrode at the heavy-metal contaminated soil two ends; Positive and negative electrode is carbon fiber and processes; Between positive and negative electrode and contaminated soil, place adsorbent respectively, above near the soil adsorbent, drip irrigation appliance is set, electrolyte, buffer solution or complexing agent etc. are added drop-wise to pollute go up the earth both sides; Electrode is carried out periodical anode and cathode polarity switch, reduce its concentration in soil thereby heavy metal relies on electrokinetic migration to act in the soil motion and be adsorbed agent absorption.Said adsorbent is a kind of in active carbon, iron powder, tourmaline, zeolite, diatomite, peat, kaolinite, the montmorillonite; In adding electrolyte (KCl, NaCl), buffer solution (citric acid, lactic acid, oxalic acid, organic aliphatic acid) or the complexing agent (EDTA, HEDP) one or more, the electrode switching frequency is 3～48h.
Advantage and good effect that the present invention has are: at first; Through drip irrigation water outside contaminated soil replenishes; Moisture slowly infiltrates soil equably, can play the maintenance effect to soil texture, and provides electrodynamics such as electromigration, electrodialysis and electrophoresis to strengthen the recirculated water that needs in the repair process; The electrolyte that adds in the water, buffer solution or complexing agent further promote the desorb and the migration of heavy metal in soil, and liquid is retained in and does not produce the secondary pollution waste liquid in the soil after the drip irrigation; The carbon fiber product kind is numerous, and shapes such as felt, honeycombs, fabric and fibre bundle are arranged, and can directly be cut into suitable dimensions and do electrode slice, the more important thing is to have flexibility and elasticity, can guarantee that electrode fully contacts with the soil end face in the electronic repair process; The periodic polarity of electrode that switches can effectively prevent soil acidification, suppresses the OH that electrolysis produces
-In soil, spread, can not produce deposition and stop up hole, interstices of soil water can be migrated in the soil body under electric field action repeatedly, and electromigration remains on higher level, makes heavy metal move to adsorption zone simultaneously and removes, thereby reduced its concentration in soil.
Description of drawings
For further understanding summary of the invention of the present invention, characteristics and effect, the following examples of giving an example now, and conjunction with figs. specifies as follows:
Fig. 1 is a treatment system sketch map of realizing the embodiment of the invention.
Among the figure: 1, anode; 2, negative electrode; 3, adsorbent; 4, contaminated soil; 5, drip irrigation equipment; 6, power supply
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, the following examples of giving an example now, and conjunction with figs. specifies as follows:
Embodiment 1
As shown in Figure 1; Electrolytic cell is for opening wide lucite container and horizontal positioned; 1,2 is respectively carbon fiber and processes anode, negative electrode; Place tourmaline powder between the both sides of contaminated soil 4 and electrode, drip irrigation appliance 5 is set near the soil the tourmaline powder, anode 1 is connected with the two ends of dc source 6 respectively with negative electrode 2.
The length of electrolytic cell is of a size of 30cm * 10cm * 11cm, with Cd (NO
3)
2, Pb (NO
3)
2Be mixed with contaminated soil, the thick 0.6cm of both sides tourmaline, tourmaline granularity d
90=5.23 μ m, voltage gradient is 1.0V/cm, continues the KCl solution of drip irrigation 0.1mol/L, and the drip irrigation total amount is 1800ml, and electrode spacing is 20cm, and the anode and cathode switching cycle is 3h, system moves 12 days continuously.Content of beary metal is seen table 1 in before and after the contaminated soil reparation.Because heavy metal is moved to the hydroxyl generation complex reaction on adsorption zone and tourmaline surface, separates out when reaching the finite concentration post crystallization, thereby reduces its concentration in soil.
Content of beary metal mg/kg before and after the soil treating among table 1 embodiment 1
| Heavy metal | Before the processing | After the processing |
| Cd | 330 | 45.1 |
| Pb | 410 | 52.6 |
[0018]Embodiment 2
As shown in Figure 1; Electrolytic cell is for opening wide lucite container and horizontal positioned; 1,2 is respectively carbon fiber and processes anode, negative electrode; Place zeolite powder between the both sides of contaminated soil 4 and electrode, drip irrigation appliance 5 is set near the soil the zeolite powder, anode 1 is connected with the two ends of dc source 6 respectively with negative electrode 2.
The length of electrolytic cell is of a size of 30cm * 10cm * 11cm, with Cd (NO
3)
2, Pb (NO
3)
2Be mixed with contaminated soil, the thick 0.6cm of both sides zeolite, zeolite particle size d
90=1.68 μ m, voltage gradient is 1.0V/cm, continues the drip irrigation citric acid solution, and the drip irrigation total amount is 1900ml, and electrode spacing is 20cm, and the anode and cathode switching cycle is 12h, system moves 12 days continuously.Content of beary metal is seen table 1 in before and after the contaminated soil reparation.
Content of beary metal mg/kg before and after the soil treating among table 2 embodiment 2
| Heavy metal | Before the processing | After the processing |
| Cd | 330 | 36.7 |
| Pb | 410 | 43.6 |
As shown in Figure 1; Electrolytic cell is for opening wide lucite container and horizontal positioned; 1,2 is respectively carbon fiber and processes anode, negative electrode; Place diatomite in powder 3 between the both sides of contaminated soil 4 and electrode, drip irrigation appliance 5 is set near the soil the diatomite, anode 1 is connected with the two ends of dc source 6 respectively with negative electrode 2.
The length of electrolytic cell is of a size of 30cm * 10cm * 11cm, with Cd (NO
3)
2, Pb (NO
3)
2Be mixed with contaminated soil, the thick 0.6cm of both sides diatomite, voltage gradient is 1.0V/cm, continues drip irrigation EDTA solution, and the drip irrigation total amount is 2100ml, and electrode spacing is 20cm, and the anode and cathode switching cycle is 48h, system moves 12 days continuously.Content of beary metal is seen table 1 in before and after the contaminated soil reparation.
Content of beary metal mg/kg before and after the soil treating among table 3 embodiment 3
| Heavy metal | Before the processing | After the processing |
| Cd | 330 | 38.5 |
| Pb | 410 | 44.9 |
Although combine accompanying drawing that the preferred embodiments of the present invention are described above; But the present invention is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Not breaking away under the scope situation that aim of the present invention and claim protect, can also make a lot of forms, these all belong within protection scope of the present invention.
Claims (5)
1. an electrodynamics is united drip irrigation restoration of soil polluted by heavy metal method.It is characterized in that installation positive and negative electrode at the heavy-metal contaminated soil two ends; This method is that positive and negative electrode is installed at the heavy-metal contaminated soil two ends; Between positive and negative electrode and contaminated soil, place adsorbent respectively; Above near the soil adsorbent, drip irrigation appliance is set; Electrolyte, buffer solution or complexing agent etc. slowly are added drop-wise in the contaminated soil of both sides, electrode are carried out periodical anode and cathode polarity switch, thereby heavy metal relies on electrokinetic migration effect campaign and is adsorbed agent and adsorbs and reduce its concentration in soil.
2. electrodynamics according to claim 1 is united drip irrigation restoration of soil polluted by heavy metal method, it is characterized in that adding in electrolyte (KCl, NaCl), buffer solution (citric acid, lactic acid, single acid, organic aliphatic acid) or the complexing agent (EDTA, HEDP) one or more.
3. electrodynamics according to claim 1 associating drip irrigation restoration of soil polluted by heavy metal method is characterized in that said adsorbent is a kind of in active carbon, iron powder, tourmaline, zeolite, diatomite, peat, kaolinite, the montmorillonite.
4. electrodynamics associating drip irrigation restoration of soil polluted by heavy metal method according to claim 1 is characterized in that said positive and negative electrode all adopts carbon fibre material to process.
5. electrodynamics associating drip irrigation restoration of soil polluted by heavy metal method according to claim 1 is characterized in that the electrode switching frequency is 3～48h.
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Cited By (20)
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| CN102921715A (en) * | 2012-11-09 | 2013-02-13 | 苏州科技学院 | Method and device for electrically recovering phenol-contaminated soil by using three-dimensional porous carbon electrode |
| CN103406347A (en) * | 2013-07-18 | 2013-11-27 | 江南大学 | Method for enriching heavy metals and organic matters in soil |
| CN103519030A (en) * | 2013-10-14 | 2014-01-22 | 无锡艾科瑞思产品设计与研究有限公司 | Device for treating heavy metal ions in residual pesticide on vegetables and fruits |
| CN104263372A (en) * | 2014-10-20 | 2015-01-07 | 风禾尽起科技(北京)有限公司 | Preparation method of carbon-silicone solution |
| CN104785505A (en) * | 2015-04-29 | 2015-07-22 | 重庆大学 | Method for removing heavy metals in municipal solid waste incineration fly ash |
| CN105131959A (en) * | 2015-06-29 | 2015-12-09 | 昆明理工大学 | Preparation method of permeable reactive material for electrokinetic remediation and removal of copper in mining area soil |
| CN105170629A (en) * | 2015-10-23 | 2015-12-23 | 刘柏海 | Biological and physical combination method for repairing soil |
| CN105466751A (en) * | 2016-01-04 | 2016-04-06 | 核工业北京地质研究院 | Device for gathering metal ions in soil and application method of device |
| CN105632314A (en) * | 2015-11-05 | 2016-06-01 | 浙江工业大学 | Experiment apparatus for electrokinetic remediation and use method |
| CN105903758A (en) * | 2016-05-25 | 2016-08-31 | 哈尔滨工业大学 | System for remediating heavy metal contaminated soil with combination of photovoltaic technology and regional dialysis and using method |
| CN106552819A (en) * | 2017-01-25 | 2017-04-05 | 宋欢 | A kind of soil restoring device and method |
| CN107335683A (en) * | 2017-09-04 | 2017-11-10 | 长春工程学院 | The electro reclamation system and control method of heavy-metal contaminated soil |
| CN109454099A (en) * | 2017-09-06 | 2019-03-12 | Ik株式会社 | The heavy metals removal method of contaminated soil |
| CN109719122A (en) * | 2019-01-17 | 2019-05-07 | 长沙理工大学 | The processing method and processing device of heavy metal ion in a kind of removal soil (water body) with adsorbent |
| CN109848201A (en) * | 2019-01-14 | 2019-06-07 | 同济大学 | A kind of electronic power drive and electric-heating activated oxidation/reduction restorative procedure |
| CN110404508A (en) * | 2019-08-06 | 2019-11-05 | 中南大学 | A kind of soil and preparation method thereof for the airborne particulates that adsorb and degrade |
| CN110420983A (en) * | 2019-08-30 | 2019-11-08 | 清华大学 | The method and system of joint elution, absorption and electro reclamation heavy-metal contaminated soil |
| CN111687203A (en) * | 2020-07-16 | 2020-09-22 | 常州大学 | Device and method for remedying heavy metal contaminated soil through light energy-vertical electrokinetic remediation |
| CN113182349A (en) * | 2021-06-08 | 2021-07-30 | 福州大学 | Method for restoring chromium-polluted soil by utilizing electro-dynamic coupling permeation reaction wall |
| CN113895547A (en) * | 2021-11-18 | 2022-01-07 | 北京兴旺利来商贸有限责任公司 | Scraped car recycling process |
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| CN111687203A (en) * | 2020-07-16 | 2020-09-22 | 常州大学 | Device and method for remedying heavy metal contaminated soil through light energy-vertical electrokinetic remediation |
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Application publication date: 20120620 |