CN103752599A - Equipment and method for restoring heavy metal contaminated soil by combining leaching and electro-deposition - Google Patents
Equipment and method for restoring heavy metal contaminated soil by combining leaching and electro-deposition Download PDFInfo
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- CN103752599A CN103752599A CN201310749657.3A CN201310749657A CN103752599A CN 103752599 A CN103752599 A CN 103752599A CN 201310749657 A CN201310749657 A CN 201310749657A CN 103752599 A CN103752599 A CN 103752599A
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Abstract
The invention provides equipment for restoring heavy metal contaminated soil by combining leaching and electro-deposition. The equipment comprises a leaching column, a buffer tank, an electro-deposition tank, a first circulating pump and a second circulating pump, wherein contaminated soil is contained in the leaching column; a leaching sprinkler is arranged at the upper end of the leaching column, and screen cloth is arranged at the lower end of the leaching column; the leaching sprinkler is connected with a spraying pipe; the leaching column is connected to the upper end of the buffer tank; a negative electrode and a positive electrode are arranged in the electro-deposition tank; a direct current power supply is connected between the positive and negative electrodes; one end of the first circulating pump is connected with the buffer tank, and the other end of the first circulating pump leads to the electro-deposition tank; one end of the second circulating pump is connected with the electro-deposition tank, and the other end of the second circulating pump is connected with the spraying pipe. According to the equipment, heavy metal in the soil can be efficiently and rapidly removed, waste liquor causing secondary pollution is effectively avoided, the heavy metal in the waste liquor is timely recycled, cyclic utilization of the remaining waste liquor can be realized, and inorganic acid and water resources can be greatly saved; an electro-deposition method is organically combined with an acid washing method, so that the equipment has the advantages of simplicity in operation, short restoration period, low cost and the like.
Description
Technical field
The present invention relates to a kind of Apparatus and method for to heavy metal pollution soil remediation, relate in particular to a kind of Apparatus and method for that can carry out to ring waste the drip washing associating electro-deposition restoration of soil polluted by heavy metal that electro-deposition recycles.
Background technology
In recent years along with the developing rapidly and the frequent increase of mankind's activity of industry, the waste water, waste residue that contains in a large number heavy metal not being discharged in soil after strict high-level processing.Due to features such as high cumulative bad, disguise and the bio-refractories of heavy metal, not only cause a large amount of soils to cultivate and lie on the table, but also can be by food chain effect, jeopardize the health of human body.Heavy-metal contaminated soil especially industrial waste ground serious pollution soil is repaired and administered and become environmental problem urgently to be resolved hurrily.
The improvement of the heavy-metal contaminated soil being applied in that at present both at home and abroad research relates to and actual process mainly contains solidifies and removes 2 kinds of approach.In recent years, around these two kinds of approach, different control measures and method have been developed, as solidified, reduction, agricultural regulation and control, biological prosthetic and phytoremediation etc., but these methods have not thorough, the consuming time length of processing, easily produce high malicious mesostate and the shortcoming such as be of limited application, thereby not yet in engineering, apply.In engineering, main method has following several at present: the method for improving the soil, electronic repairing method, heat treating process, sparkling technology and soil washing.Compared with soil washing, the method for improving the soil, electronic repairing method, heat treating process and vitrification there is secondary pollution or the scope of application little or expensive, all have comparatively obviously wait not enough.
Soil washing is to use physics or chemical means that the organic and inorganic pollution in contaminated soil is carried out to process separate, that isolate, concentrate or carry out harmless treatment.Wherein the selection of eluent is the key of recovery technique.The heavy metal eluent of having reported is mainly surfactant and acids eluent.Surfactant divides artificial synthetic complexing agent (EDTA etc.), biosurfactant (comprising rhamnolipid, sophorolipid, husky graceful and saponin of ancient India etc.).EDTA can be combined into stable chelate with most of metal ion because of it, to the Cu in soil, Zn, Pb, Hg, Cd and Cr etc. have higher removal efficiency, thereby are widely used in the reparation of heavy-metal contaminated soil, but EDTA exists the problems such as expensive, biological degradability is poor, recovery is difficult.In recent years, people start biosurfactant to replace EDTA for Soil leaching, but biosurfactant output is lower, and production cost is higher.Therefore, the plant-scale application of biosurfactant at present does not have advantage.Acids eluent mainly comprises natural organic acids solution (citric acid, malic acid, oxalic acid, malonic acid, humic acid and fulvic acid etc.), inorganic acid solution (HC1 and HNO3 etc.).Organic acid does not have too large harm to environment yet, and can large-arealy promote the use of.But can only be for the heavy-metal contaminated soil of slight or intermediate pollution.For the soil of serious pollution, can bring the problems such as eluent consumption is large, disposal cost is high.
Though can cause the physicochemical property of soil to change after inorganic acid drip washing, but it has good effect for the soil of industrial waste ground serious pollution, heavy metal in can maximized removal soil, and cheap, and drip washing soil is later as solid waste landfill.But traditional inorganic acids drip washing technique exist ring waste cause that secondary pollution, the rate of recovery are not high, water consumption is large, heavy metal reclaims the problems such as corollary equipment shortcoming and safe handling process complexity.
In electro-deposition abstraction waste liquor, the method for heavy metal ion is in solution, to insert anodic-cathodic, applies the electric field that faint direct current forms, and under the effect of electric field, in solution, heavy metal cation moves and deposit to negative electrode, then concentrates and separates or reclaim.But electro-deposition deposition processes Soil leaching waste liquid aspect has no research report.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of Apparatus and method for that can carry out to ring waste the restoration of soil polluted by heavy metal that electro-deposition recycles.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the equipment that a kind of drip washing associating electro-deposition restoration of soil polluted by heavy metal is provided, comprise drip washing post, the in-built restoration of soil polluted by heavy metal that needs of described drip washing post, in drip washing post, the upper end of heavy-metal contaminated soil to be repaired is provided with drip washing shower nozzle, drip washing shower nozzle connection one is used for supplementing the shower of leacheate, and in described drip washing post, the lower end of heavy-metal contaminated soil to be repaired is provided with screen cloth;
Dashpot, described dashpot upper end is connected to the lower end part of drip washing post by pipeline;
Electro-deposition tank, is filled with electrodeposit liquid in described electro-deposition tank, and is provided with yin, yang electrode, between described yin, yang electrode, connects a dc source;
The first circulating pump, the pipeline of described first circulating pump one end connects the lower end of dashpot, and the pipeline of the other end passes into electro-deposition tank from electro-deposition tank upper end;
The second circulating pump, the pipeline of described second circulating pump one end connects the lower end of electro-deposition tank, and the pipeline of the other end connects and is connected with shower.
Further, described drip washing post is for opening wide lucite post, and vertically placement.
Further, in described drip washing post, one deck stone is laid in the upper end of heavy-metal contaminated soil to be repaired.
Further, in described electro-deposition tank, middle part is provided with 1 negative electrode, and in electro-deposition tank, surrounding is evenly arranged 4～8 positive electrodes.
A kind of method of utilizing the said equipment to carry out drip washing associating electro-deposition restoration of soil polluted by heavy metal is also provided, comprises the steps:
Step 1, heavy-metal contaminated soil is put into drip washing post, inorganic leacheate carries out drip washing to soil from top to bottom, and the waste collection after drip washing is in the dashpot of drip washing column bottom;
Further, the inorganic drip washing Ji in described step 1 is formed by sodium chloride and inorganic acid mixed preparing.
Further, described inorganic acid is hydrochloric acid, sulfuric acid or nitric acid, and its pH value is between 3～4.
Further, described sodium chloride consumption is 100～200g/L.
Advantage and good effect that the present invention has are: first, use the heavy-metal contaminated soil of inorganic leacheate drip washing high concentration, efficiently and rapidly remove heavy metal in soil; Simultaneously, utilize electrodeposition process to process ring waste, not only effectively avoided producing the waste liquid of secondary pollution, heavy metal in Recycling of waste liquid in time, and reusable edible residual waste solution, can save a large amount of inorganic acids and water resource, electrodeposition process and acid wash are organically combined, have simple to operate, repairing efficiency is short and low cost and other advantages; In addition, the present invention can promote the industrialization process that heavy-metal contaminated soil is repaired.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the equipment specific embodiment of drip washing associating electro-deposition restoration of soil polluted by heavy metal of the present invention.
In figure:
1. drip washing post, 2. stone, 3. contaminated soil, 4. screen cloth, 5. dashpot, 6. the first circulating pump,
7. the second circulating pump, 8. electro-deposition tank, 9. positive electrode, 10. negative electrode, 11. dc sources,
12. showers, 13. drip washing shower nozzles.
The specific embodiment
For to the more deep understanding of the present invention, now enumerate following specific embodiment, and by reference to the accompanying drawings, the present invention is described in further detail.
The present embodiment is a kind of Apparatus and method for of drip washing associating electro-deposition remediating heavy metal.
As shown in Figure 1, a kind of equipment of drip washing associating electro-deposition restoration of soil polluted by heavy metal, comprise drip washing post 1, dashpot 5, electro-deposition tank 8, the first circulating pump 6 and the second circulating pump 7, the in-built restoration of soil polluted by heavy metal 3 that needs of drip washing post 1, the upper end of the interior heavy-metal contaminated soil 3 to be repaired of drip washing post 1 is provided with drip washing shower nozzle 13, drip washing shower nozzle 13 connects one and is used for supplementing the shower 12 of leacheate, and the lower end of drip washing post 1 interior heavy-metal contaminated soil to be repaired is provided with screen cloth 4; Dashpot 5 upper ends are connected to the lower end part of drip washing post 1 by pipeline; In electro-deposition tank 8, be filled with electrodeposit liquid, and be provided with yin, yang electrode, between yin, yang electrode, connect a dc source 11; The pipeline of first circulating pump 6 one end connects the lower end of dashpot 5, and the pipeline of the other end passes into electro-deposition tank 8 from electro-deposition tank 8 upper ends; The pipeline of second circulating pump 7 one end connects the lower end of electro-deposition tank 8, and the pipeline of the other end connects and is connected with the shower 12 of drip washing post 1 upper end; Drip washing post 1 is for opening wide lucite post, and vertically placement, and it is highly 24cm, and diameter is 9cm, and one deck stone is laid in the upper end of drip washing post 1 interior heavy-metal contaminated soil to be repaired; In the present embodiment, the interior middle part of electro-deposition tank 8 is provided with 1 negative electrode 10, and the interior surrounding of electro-deposition tank 8 is evenly arranged 4～8 positive electrodes 9.
The said equipment to the drip washing associating electro-deposition restorative procedure of heavy-metal contaminated soil for comprising the steps:
Step 1, heavy-metal contaminated soil is put into drip washing post, inorganic leacheate carries out drip washing to soil from top to bottom, and the waste collection after drip washing is in the dashpot of drip washing column bottom; Wherein, inorganic drip washing Ji is formed by sodium chloride and inorganic acid mixed preparing, and inorganic acid is hydrochloric acid, sulfuric acid or nitric acid, and its pH value is between 3～4, and sodium chloride consumption is 100～200g/L;
In brief, heavy-metal contaminated soil is put into drip washing post, by inorganic acid (hydrochloric acid, sulfuric acid or nitric acid etc.) and the inorganic leacheate of sodium chloride mixture, from top to bottom soil is carried out to drip washing, the waste collection after drip washing is in the dashpot of drip washing column bottom; Utilize circulating pump that waste liquid is sent into electro-deposition tank from dashpot, in electro-deposition tank, carry out heavy metal separation; Under electric field action, in waste liquid, metal cation deposits on negative electrode, and the top that residual waste solution is delivered to drip washing post by another circulating pump is again as leacheate reuse.
Enumerate three examples that utilize different inorganic leacheates the soil of variety classes heavy metal pollution to be carried out to drip washing below:
The first: take 1.2kg and pollute sand, the content that pollutes Pb in sand is 615mg/kg, earth pillar bottom is fixed with 400 eye mesh screens, add NaCl and a small amount of hydrochloric acid by 200g/L, the leacheate of pH=3, leacheate is from cylinder slow drip washing contaminated soil from top to bottom, ring waste is collected through baffle-box, in peristaltic pump is sent into electro-deposition tank, in the middle of electro-deposition tank, be provided with 1 negative electrode graphite electrode, in tank, be uniformly distributed 6 anode graphite electrodes around, between electrode, connect dc source, electro-deposition separates heavy metal in waste liquid, residual waste solution is sent again drip washing post top back to by peristaltic pump contaminated soil is carried out to drip washing.After cycling elution 3h, in residue sand, the concentration of Pb is reduced to 29.3mg/kg.
The second: take 1.2kg and pollute sand, the content that pollutes Cd in sand is 462mg/kg, earth pillar bottom is fixed with 400 eye mesh screens, add NaCl and a small amount of sulfuric acid by 100g/L, the leacheate of pH=3.5, leacheate is from cylinder slow drip washing contaminated soil from top to bottom, ring waste is collected through baffle-box, in peristaltic pump is sent into electro-deposition tank, in the middle of electro-deposition tank, be provided with 1 negative electrode graphite electrode, in tank, be uniformly distributed 6 anode graphite electrodes around, between electrode, connect dc source, electro-deposition separates heavy metal in waste liquid, residual waste solution is sent again drip washing post top back to by peristaltic pump contaminated soil is carried out to drip washing.After cycling elution 3h, in residue sand, the concentration of Cd is reduced to 52.6mg/kg.
The third: take 1.2kg and pollute sand, the content that pollutes Cu in sand is 518mg/kg, earth pillar bottom is fixed with 400 eye mesh screens, add NaCl and a small amount of nitric acid by 200g/L, the leacheate of pH=4, leacheate is from cylinder slow drip washing contaminated soil from top to bottom, ring waste is collected through baffle-box, in peristaltic pump is sent into electro-deposition tank, in the middle of electro-deposition tank, be provided with 1 negative electrode graphite electrode, in tank, be uniformly distributed 6 anode graphite electrodes around, between electrode, connect dc source, electro-deposition separates heavy metal in waste liquid, residual waste solution is sent again drip washing post top back to by peristaltic pump contaminated soil is carried out to drip washing.After cycling elution 3.5h, in residue sand, the concentration of Cu is reduced to 39.8mg/kg.
Above embodiments of the invention are had been described in detail, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the scope of the invention and improvement etc., within all should still belonging to this patent covering scope.
Claims (8)
1. the equipment of a drip washing associating electro-deposition restoration of soil polluted by heavy metal, it is characterized in that: comprise drip washing post, the in-built restoration of soil polluted by heavy metal that needs of described drip washing post, in drip washing post, the upper end of heavy-metal contaminated soil to be repaired is provided with drip washing shower nozzle, drip washing shower nozzle connection one is used for supplementing the shower of leacheate, and in described drip washing post, the lower end of heavy-metal contaminated soil to be repaired is provided with screen cloth;
Dashpot, described dashpot upper end is connected to the lower end part of drip washing post by pipeline;
Electro-deposition tank, is filled with electrodeposit liquid in described electro-deposition tank, and is provided with yin, yang electrode, between described yin, yang electrode, connects a dc source;
The first circulating pump, the pipeline of described first circulating pump one end connects the lower end of dashpot, and the pipeline of the other end passes into electro-deposition tank from electro-deposition tank upper end;
The second circulating pump, the pipeline of described second circulating pump one end connects the lower end of electro-deposition tank, and the pipeline of the other end connects and is connected with shower.
2. the equipment of drip washing associating electro-deposition restoration of soil polluted by heavy metal according to claim 1, is characterized in that: described drip washing post is for opening wide lucite post, and vertically placement.
3. the equipment of drip washing associating electro-deposition restoration of soil polluted by heavy metal according to claim 1, is characterized in that: in described drip washing post, one deck stone is laid in the upper end of heavy-metal contaminated soil to be repaired.
4. according to the equipment of the drip washing associating electro-deposition restoration of soil polluted by heavy metal described in claim 1-3 any one, it is characterized in that: in described electro-deposition tank, middle part is provided with 1 negative electrode, in electro-deposition tank, surrounding is evenly arranged 4～8 positive electrodes.
5. utilize equipment described in claim 1 to carry out a method for drip washing associating electro-deposition restoration of soil polluted by heavy metal, comprise the steps:
Step 1, heavy-metal contaminated soil is put into drip washing post, inorganic leacheate carries out drip washing to soil from top to bottom, and the waste collection after drip washing is in the dashpot of drip washing column bottom;
Step 2, utilize the first circulating pump that waste liquid is passed in electro-deposition tank from dashpot, between the yin, yang electrode of electro-deposition tank, be connected with direct current and produce electric field, by electric field action by heavy metal in waste liquid ion deposition on negative electrode;
Step 3, the residual waste solution after separating beavy metal is transported to by the second circulating pump in the shower of drip washing post upper end, as leacheate, reuses.
6. the method for drip washing associating electro-deposition restoration of soil polluted by heavy metal according to claim 5, is characterized in that: the inorganic drip washing Ji in described step 1 is formed by sodium chloride and inorganic acid mixed preparing.
7. the method for drip washing associating electro-deposition restoration of soil polluted by heavy metal according to claim 6, is characterized in that: described inorganic acid is hydrochloric acid, sulfuric acid or nitric acid, its pH value is between 3～4.
8. the method for drip washing associating electro-deposition restoration of soil polluted by heavy metal according to claim 6, is characterized in that: described sodium chloride consumption is 100～200g/L.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104646405A (en) * | 2015-02-15 | 2015-05-27 | 中国科学院生态环境研究中心 | Electrode device and method for lowering arsenic and lead concentrations in rice |
| CN104841691A (en) * | 2015-04-30 | 2015-08-19 | 东莞理工学院 | Repair method of heavy metal nickel contaminated soil |
| CN105750313A (en) * | 2016-05-04 | 2016-07-13 | 辽宁石油化工大学 | Surfactant enhanced organic polluted soil electric-biological remediation method and device |
| CN107639108A (en) * | 2017-07-21 | 2018-01-30 | 郑旭东 | A kind of Ex-situ washing remediation of heavy-metal contaminated soil |
| CN107855353A (en) * | 2017-07-21 | 2018-03-30 | 郑旭东 | A kind of plane leaching repairing method in situ of heavy-metal contaminated soil |
| CN110270585A (en) * | 2018-03-13 | 2019-09-24 | 川尚股份有限公司 | Pollute the processing method of mixture |
| CN112676327A (en) * | 2020-12-04 | 2021-04-20 | 北京建筑大学 | System and method for repairing arsenic-polluted soil through electric auxiliary leaching stabilization |
| 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 |
| CN113714267A (en) * | 2021-09-07 | 2021-11-30 | 天津大学 | Column flushing equipment for contaminated soil leaching experiment |
| CN114260302A (en) * | 2021-12-23 | 2022-04-01 | 河海大学 | Thermal desorption layered remediation method for heavy metal contaminated soil and soil remediation equipment thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104646405A (en) * | 2015-02-15 | 2015-05-27 | 中国科学院生态环境研究中心 | Electrode device and method for lowering arsenic and lead concentrations in rice |
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| CN105750313B (en) * | 2016-05-04 | 2019-09-10 | 辽宁石油化工大学 | A kind of method that surfactant reinforcing organic polluted soil is electronic-biological prosthetic |
| CN107639108A (en) * | 2017-07-21 | 2018-01-30 | 郑旭东 | A kind of Ex-situ washing remediation of heavy-metal contaminated soil |
| CN107855353A (en) * | 2017-07-21 | 2018-03-30 | 郑旭东 | A kind of plane leaching repairing method in situ of heavy-metal contaminated soil |
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| CN112718842B (en) * | 2020-11-18 | 2022-07-29 | 上海清宁环境规划设计有限公司 | Supplementary chelant and device of power supply rapid draing soil heavy metal ion in coordination |
| CN112676327A (en) * | 2020-12-04 | 2021-04-20 | 北京建筑大学 | System and method for repairing arsenic-polluted soil through electric auxiliary leaching stabilization |
| CN113714267A (en) * | 2021-09-07 | 2021-11-30 | 天津大学 | Column flushing equipment for contaminated soil leaching experiment |
| CN114260302A (en) * | 2021-12-23 | 2022-04-01 | 河海大学 | Thermal desorption layered remediation method for heavy metal contaminated soil and soil remediation equipment thereof |
| CN114260302B (en) * | 2021-12-23 | 2023-01-31 | 河海大学 | Thermal desorption layered remediation method for heavy metal contaminated soil and soil remediation equipment thereof |
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Application publication date: 20140430 |