CN203304274U - Device for intensively treating heavy metal contaminated soil by power-driven method - Google Patents
Device for intensively treating heavy metal contaminated soil by power-driven method Download PDFInfo
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- CN203304274U CN203304274U CN2013203576555U CN201320357655U CN203304274U CN 203304274 U CN203304274 U CN 203304274U CN 2013203576555 U CN2013203576555 U CN 2013203576555U CN 201320357655 U CN201320357655 U CN 201320357655U CN 203304274 U CN203304274 U CN 203304274U
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Abstract
The utility model discloses a leaching device for intensively treating a heavy metal contaminated soil by a power-driven method. The leaching device comprises a storage tank with a leaching solution, wherein the storage tank is communicated with an inner cavity of a soil treatment chamber through a first guide tube, and the first guide tube is provided with a first pump; the soil treatment chamber is composed of a ring-shaped anode chamber, a cathode chamber positioned in an inner cavity of the anode chamber as well as a cavity body formed by a filtering film connected with the bottom surfaces of the anode and cathode chambers, the anode and cathode chamber both contain electrolyte, and a voltage stabilization electric field is applied between the anode and cathode chambers; a positive ion selective changing film is arranged between the cathode chamber and the soil treatment chamber, and the inner cavity of the soil treatment chamber is communicated with a leacheate collecting tank through a second guide tube; the second guide tube is provided with a switch, the inner cavity of the soil treatment chamber and the leacheate collecting tank are communicated through a third guide tube, and the third guide tube is provided with a second pump. The leaching device provided by the utility model has the advantages that the removal rate of heavy metal is effectively improved, the repairing cycle is shortened, and the practicability of a repairing technology is improved.
Description
Technical field
The utility model relates to contaminated soil recovery technique field, refers to especially a kind of elution device that adopts electrical means intensive treatment heavy-metal contaminated soil.
Background technology
Heavy metal is pollutant very rambunctious, and its is long in incubation period, be difficult for being discovered, endanger and be chronic accumulation, have non-biodegradable by people, in case in entered environment, will produce a series of persistence pollution, is difficult for being removed.Soil is important natural resources, be mankind's basic necessities of life of depending on for existence this, the heavy metal contaminants in soil permeates downwards by the rain effect, causes underground water pollution, by rainwash, cause surface water pollution, jeopardize directly or indirectly health.In industrial technology highly developed today, along with a large amount of discharges in the ground such as sanitary sewage, industrial wastewater, waste gas and waste residue or pile up, soil environment just is being subjected to unprecedented heavy metal and is threatening.It is reported, the soil pollution of China mainly be take heavy metal pollution as main, and wherein cadmium, mercury, lead, arsenic pollute the most outstandingly, and China approximately has the soil of tens thousand of hectares to be subject to the pollutions such as cadmium, mercury at present.In recent years, how restoration of soil polluted by heavy metal, reduce the harm that heavy metal pollution of soil produces, and become the important topic in national environmental protection field.
At present the governance way of heavy-metal contaminated soil mainly contained to two kinds: 1. change heavy metal and have a form in soil, reduce its animal migration and bioavailability in environment thereby it is fixed; 2. from removal heavy metal soil.The tradition improvement method of heavy-metal contaminated soil, comprise the physico-chemical processes such as soil solidification, vitrifying, soil moved in to improve the original method, electrochemical process, and, there are many limitations in actual applications in these method somewhat expensives.Elution method is a kind of effectively method of repairing polluted soil, namely with eluent, cleans soil, and pollutant in soil is flowed out with leacheate, then leacheate and soil is carried out to subsequent treatment, thereby reaches the purpose of repairing polluted soil.Soil washing has multiple way of realization, can be divided into two kinds by place, original position reparation (in-situ) and showering (ex-situ).With other processing methods, compare, elution method not only has can remove pollutants a large amount of in soil, the range of scatter of restriction noxious pollutant, also have investment and consume relatively less, operating personnel can be not the direct advantage such as contact stain thing.Although the soil washing application prospect is extensive, but still have following point: the 1. use of part drip washing/cleaning agent can cause secondary pollution; 2. because drip washing/cleaning technique is stricter to soil texture requirement, when soil medium clay soil content surpassed 25%～30%, this technology was difficult to application; 3. Soil leaching/cleaning technique need to consume large water gaging or eluent.
Electronic repairing method is paid attention to and development starts from the nineties in 20th century, because it has fast, original position, processing can reach tens of rice under earth's surface, process the characteristics such as pollutant is various has received concern, developed into a kind of effective contaminated soil of site recovery technique, mainly by the contaminated soil both sides, applying DC electric field, heavy metal in soil is being moved to by mass transfer approach such as electromigration, EOF and electrophoresis under the potential gradient effect near electrode, then in modes such as ion-exchange extraction or electrodeposition process removals, reach the purpose of repairing polluted soil.Electric repairing technique is applicable to the soil from the stickiness to the grittiness, with respect to the technology such as drip washing that are applicable to high osmosis soil more, EOF in electric repairing technique still can effectively produce in hypotonicity soil, so soil types is not to affect the principal element whether this technology is suitable for.The a great problem that electronic repair process exists is that heavy metal cation is being subjected to negative electrode OH in the cathodic migration process
-Impact be easy to be deposited near cathodic region, blocked soil aperture, be unfavorable for further migration and the removal of heavy metal.
Heavy metal pollution of soil has disguise, hysteresis quality, cumulative bad, region, chronicity and irreversibility, belongs to compound pollution.Therefore, single recovery technique often remediation efficiency is not high, is difficult to reach expection and repairs target, and adopting the combination recovery technique is the development trend in soil remediation field.
The utility model content
The purpose of this utility model is to provide a kind of elution device that adopts electrical means intensive treatment heavy-metal contaminated soil, and it can effectively improve heavy metal removing rate, shortens repairing efficiency, improves the practicality of recovery technique.
To achieve these goals, the utility model provides a kind of elution device that adopts electrical means intensive treatment heavy-metal contaminated soil, comprise the storage tank that leacheate is housed, wherein said storage tank is communicated with soil treating chamber's inner chamber that rehabilitating soil is housed by the first conduit, described the first conduit is provided with the first pump, described soil treating chamber is the anode chamber by ring-type, be positioned at the cathode chamber of anode chamber's inner chamber and be connected in sun, the cavity that the filter membrane of cathode chamber bottom surface surrounds, described sun, electrolyte is housed respectively in cathode chamber, described sun, between cathode chamber, be applied with the voltage stabilizing electric field, between described cathode chamber and soil treating chamber, be provided with the cation selective exchange membrane, described soil treating chamber inner chamber is communicated with the leacheate collecting tank by the second conduit, described the second conduit is provided with switch, between described soil treating chamber inner chamber and leacheate collecting tank, be communicated with by the 3rd conduit, described the 3rd conduit is provided with the second pump.
Leacheate in described storage tank is for take the liquid of natural organic acids as solute.
Electrolyte in described anode chamber is identical with the leacheate in storage tank, and described storage tank communicates with anode chamber's inner chamber by the 4th conduit, and described the 4th conduit is provided with the 3rd pump.
Described anode chamber length: rehabilitating soil length: cathode chamber length=1:1.5 ~ 15:1.5.
Described first, second and third pump is peristaltic pump.
Electrolyte in described anode chamber is that concentration is acetic acid-potassium acetate solution of 0.4～4.0mol/L; Cathode chamber initial electrolysis liquid is the KNO of 0.005～0.06mol/L
3Solution.
The electric-field intensity applied between described positive and negative utmost point chamber is 0.1 V/m.
Described switch is for being clipped in the second supravasal rubber tube clip.
After adopting such scheme, the utility model adopts the elution device of electrical means intensive treatment heavy-metal contaminated soil by the basis to rehabilitating soil drip washing, the moon is set, anode chamber, and make the moon, between anode chamber, be applied with the voltage stabilizing electric field, constantly by leacheate drip washing in the process of rehabilitating soil, under electromotive action, soluble state Cd near anode chamber rehabilitating soil, Ni, the heavy metals such as Zn migrate near cathode chamber, and through the cation selective exchange membrane, make soluble state Cd, Ni, the migration of the heavy metals such as Zn can reduce the shower risk, also strengthened simultaneously simple drip washing repairing effect, due to this modification technology, also applicable to the high and low permeable soil of clay content, enlarged drip washing and repaired the scope of application, because only allowing cation, passes through the cation selective exchange membrane OH that stops catholyte to produce
-enter soil treating chamber, can avoid the salinization of soil, prevent heavy metal ion and the OH of positively charged
-certain point at earth pillar meets and generates heavy metal precipitation, is conducive to improve the removal efficiency of heavy metal contaminants.
Further beneficial effect of the present utility model is: the leacheate in storage tank is designed to take the liquid of natural organic acids as solute, the leacheate of low pH value has been avoided secondary pollution from source, and economical moderate, the heavy metal pollution of soil reparation on a large scale of applicable reality.
Further beneficial effect of the present utility model is: with the leacheate in storage tank, be designed to identical anolyte, and storage tank communicates with anode chamber's inner chamber by the 4th conduit, on the 4th conduit, establish the 3rd pump, design like this convenience, achieve many things at one stroke, it is guaranteeing to avoid under leacheate secondary pollution, economic moderate prerequisite in addition, and this leacheate can be strengthened the desorb of cure states heavy metal as anolyte.
The accompanying drawing explanation
Fig. 1 is the structural representation that the utility model adopts the elution device of electrical means intensive treatment heavy-metal contaminated soil;
Fig. 2 is the cross-sectional schematic of overlooking of anode chamber of the present utility model, soil treating chamber and cathode chamber.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model being implemented, but illustrated embodiment is not as to restriction of the present utility model.
As depicted in figs. 1 and 2, the utility model adopts the elution device of electrical means intensive treatment heavy-metal contaminated soil, comprise the storage tank 1 that leacheate is housed, leacheate is that concentration is acetic acid-potassium acetate solution of 0.4～4.0mol/L, and storage tank 1 is communicated with the inner chamber upper end of the soil treating chamber 3 that rehabilitating soil is housed by the first conduit 2.The first conduit 2 is provided with the first peristaltic pump 4.Soil treating chamber 3 is by the anode chamber 5 of ring-type, is positioned at the cathode chamber 6 of anode chamber's 5 inner chambers and is connected in the cavity that the filter membrane 7 of anode chamber 5, cathode chamber 6 bottom surfaces surrounds.In anode chamber 5, electrolyte is housed, this electrolyte is that concentration is acetic acid-potassium acetate solution of 0.4～4.0mol/L.Storage tank 1 communicates with the inner chamber of anode chamber 5 by the 4th conduit 14, and the 4th conduit 14 is provided with the 3rd peristaltic pump 15.In cathode chamber 6, electrolyte is housed, this electrolyte is that concentration is the KNO of 0.005～0.06mol/L
3Solution.Electrolyte height in anode chamber 5: the height of rehabilitating soil: the electrolyte height=1:1.5 in cathode chamber 6 ~ 15:1.5.In the middle of between anode chamber 5 and soil treating chamber 3, being provided with, accompany two porous polymethyl methyl acrylates of filter paper or filter cloth or by under acid, alkali condition, becoming the porous plate (not shown) of inertia.The electric field applied by constant voltage dc source between anode chamber 5 and cathode chamber 6, the electric-field intensity applied are 0.1 V/m.Between cathode chamber 6 and soil treating chamber 3, be provided with cation selective exchange membrane 8.The inner chamber of soil treating chamber 3 is communicated with leacheate collecting tank 10 by the second conduit 9.On the second conduit 9, accompany rubber tube clip 11.Between the inner chamber upper end of soil treating chamber 3 and leacheate collecting tank 10, be communicated with by the 3rd conduit 12, the 3rd conduit 12 is provided with the second peristaltic pump 13.
During use, by the interior concentration in anode chamber 5, be that acetic acid-potassium acetate solution of 0.4～4.0mol/L is a certain amount of by the 3rd peristaltic pump 15 suctions, to the interior storage of storage tank 1, apply electric field through the 4th conduit 14 between anode chamber 5 and cathode chamber 6, the rehabilitating soil of Compound Heavy Metals is injected to the interior certain altitude of soil treating chamber 3, make it meet the electrolyte height in anode chamber 5: the height of rehabilitating soil: the electrolyte height=1:1.5 in cathode chamber 6 ~ 15:1.5, then by the first peristaltic pump 4, the acetic acid-potassium acetate solution in storage tank 1 is intermittently injected to the inner chamber upper end of soil treating chamber 3 through the first conduit 2, take local PH and heavy metal removing rate is indication, 3-27 hour is the intermittent leaching cycle, constantly by the close cathode chamber 5 in drip washing position, under electric field action, near anode chamber 5 soluble state Cd, Ni, the heavy metal ion such as Zn migrate near cathode chamber 6, and through cation selective exchange membrane 8, open afterwards rubber tube clip 11, flow through leacheate after rehabilitating soil in filter membrane 7 enters the leacheate collecting tank 10 of below, under the effect of the second peristaltic pump 13, leacheate flows into the inner chamber upper end of soil treating chamber 3 through the 3rd conduit 12, carry out drip washing for the second time, so circulation.
The above embodiment is the preferred embodiment that absolutely proves that the utility model is lifted, and protection domain of the present utility model is not limited to this.Those skilled in the art do on the utility model basis be equal to substitutes or conversion, all within protection domain of the present utility model.Protection domain of the present utility model is as the criterion with claims.
Claims (8)
1. elution device that adopts electrical means intensive treatment heavy-metal contaminated soil, comprise the storage tank that leacheate is housed, it is characterized in that: described storage tank is communicated with soil treating chamber's inner chamber that rehabilitating soil is housed by the first conduit, described the first conduit is provided with the first pump, described soil treating chamber is the anode chamber by ring-type, be positioned at the cathode chamber of anode chamber's inner chamber and be connected in sun, the cavity that the filter membrane of cathode chamber bottom surface surrounds, described sun, electrolyte is housed respectively in cathode chamber, described sun, between cathode chamber, be applied with the voltage stabilizing electric field, between described cathode chamber and soil treating chamber, be provided with the cation selective exchange membrane, described soil treating chamber inner chamber is communicated with the leacheate collecting tank by the second conduit, described the second conduit is provided with switch, between described soil treating chamber inner chamber and leacheate collecting tank, be communicated with by the 3rd conduit, described the 3rd conduit is provided with the second pump.
2. the elution device of employing electrical means intensive treatment heavy-metal contaminated soil according to claim 1 is characterized in that: the leacheate in described storage tank is for take the liquid of natural organic acids as solute.
3. the elution device of employing electrical means intensive treatment heavy-metal contaminated soil according to claim 2, it is characterized in that: the electrolyte in described anode chamber is identical with the leacheate in storage tank, described storage tank communicates with anode chamber's inner chamber by the 4th conduit, and described the 4th conduit is provided with the 3rd pump
.
4. according to the elution device of the described employing electrical means of one of claim 1-3 intensive treatment heavy-metal contaminated soil, it is characterized in that: described anode chamber length: rehabilitating soil length: cathode chamber length=1:1.5 ~ 15:1.5
.
5. the elution device of employing electrical means intensive treatment heavy-metal contaminated soil according to claim 4, it is characterized in that: described first, second and third pump is peristaltic pump
.
6. the elution device of employing electrical means intensive treatment heavy-metal contaminated soil according to claim 5, it is characterized in that: the electrolyte in described anode chamber is that concentration is acetic acid-potassium acetate solution of 0.4～4.0mol/L; Cathode chamber initial electrolysis liquid is the KNO of 0.005～0.06mol/L
3Solution
.
7. the elution device of employing electrical means intensive treatment heavy-metal contaminated soil according to claim 6, it is characterized in that: the electric-field intensity applied between described positive and negative utmost point chamber is 0.1 V/m
.
8. the elution device of employing electrical means intensive treatment heavy-metal contaminated soil according to claim 7, it is characterized in that: described switch is for being clipped in the second supravasal rubber tube clip
.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203576555U CN203304274U (en) | 2013-06-21 | 2013-06-21 | Device for intensively treating heavy metal contaminated soil by power-driven method |
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| CN2013203576555U CN203304274U (en) | 2013-06-21 | 2013-06-21 | Device for intensively treating heavy metal contaminated soil by power-driven method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841691A (en) * | 2015-04-30 | 2015-08-19 | 东莞理工学院 | Repair method of heavy metal nickel contaminated soil |
| CN104874600A (en) * | 2015-06-05 | 2015-09-02 | 重庆大学 | Electrochemistry flushing method and electrochemical flushing device for contaminated soil |
| CN107010799A (en) * | 2017-06-15 | 2017-08-04 | 中国农业科学院农田灌溉研究所 | It is a kind of that the soil improvement system used in salt leaching is filled in Winter-Spring |
| CN107258134A (en) * | 2017-06-29 | 2017-10-20 | 天津大学 | A kind of saline land greening drives salt method with low-voltage DC |
| CN108500055A (en) * | 2018-04-17 | 2018-09-07 | 杨大伟 | A kind of heavy-metal contaminated soil reparation all-in-one machine based on ionic liquid |
| CN109332372A (en) * | 2018-12-14 | 2019-02-15 | 浙江中地净土科技有限公司 | A kind of electro reclamation vertical unit of heavy-metal contaminated soil |
| CN109848202A (en) * | 2019-02-28 | 2019-06-07 | 北京中岩大地科技股份有限公司 | A kind of tower processing equipment of Polluted Soil and waste residue |
| CN110849956A (en) * | 2019-11-05 | 2020-02-28 | 浙江科技学院 | Heavy metal migration device based on electrochemistry |
| CN112547776A (en) * | 2020-11-20 | 2021-03-26 | 中国电建集团成都勘测设计研究院有限公司 | Electrochemical device for treating contaminated soil |
-
2013
- 2013-06-21 CN CN2013203576555U patent/CN203304274U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104841691A (en) * | 2015-04-30 | 2015-08-19 | 东莞理工学院 | Repair method of heavy metal nickel contaminated soil |
| CN104874600A (en) * | 2015-06-05 | 2015-09-02 | 重庆大学 | Electrochemistry flushing method and electrochemical flushing device for contaminated soil |
| CN104874600B (en) * | 2015-06-05 | 2017-07-04 | 重庆大学 | Contaminated soil electrochemistry ELUTION METHOD and device |
| CN107010799A (en) * | 2017-06-15 | 2017-08-04 | 中国农业科学院农田灌溉研究所 | It is a kind of that the soil improvement system used in salt leaching is filled in Winter-Spring |
| CN107258134A (en) * | 2017-06-29 | 2017-10-20 | 天津大学 | A kind of saline land greening drives salt method with low-voltage DC |
| CN108500055A (en) * | 2018-04-17 | 2018-09-07 | 杨大伟 | A kind of heavy-metal contaminated soil reparation all-in-one machine based on ionic liquid |
| CN109332372A (en) * | 2018-12-14 | 2019-02-15 | 浙江中地净土科技有限公司 | A kind of electro reclamation vertical unit of heavy-metal contaminated soil |
| CN109848202A (en) * | 2019-02-28 | 2019-06-07 | 北京中岩大地科技股份有限公司 | A kind of tower processing equipment of Polluted Soil and waste residue |
| CN109848202B (en) * | 2019-02-28 | 2021-03-16 | 北京中岩大地科技股份有限公司 | Tower-type treatment equipment for polluted soil and waste residues |
| CN110849956A (en) * | 2019-11-05 | 2020-02-28 | 浙江科技学院 | Heavy metal migration device based on electrochemistry |
| CN110849956B (en) * | 2019-11-05 | 2022-02-18 | 浙江科技学院 | Heavy metal migration device based on electrochemistry |
| CN112547776A (en) * | 2020-11-20 | 2021-03-26 | 中国电建集团成都勘测设计研究院有限公司 | Electrochemical device for treating contaminated soil |
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Granted publication date: 20131127 |