CN109926444A - A kind of chemical leaching method for heavy metal pollution of soil - Google Patents
A kind of chemical leaching method for heavy metal pollution of soil Download PDFInfo
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- CN109926444A CN109926444A CN201711357491.5A CN201711357491A CN109926444A CN 109926444 A CN109926444 A CN 109926444A CN 201711357491 A CN201711357491 A CN 201711357491A CN 109926444 A CN109926444 A CN 109926444A
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- chemical leaching
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Abstract
The invention discloses a kind of chemical leaching methods for heavy metal pollution of soil, including heavy-metal contaminated soil is put into elution column, inorganic leacheate from top to bottom elutes soil, in waste collection to the dashpot of elution column bottom after elution, heap block after the completion of pre-invasion is dug, and it is sieved, soil after screening is transferred in chemical reaction kettle, it is stirred reinforcing reaction, chemical leaching liquid is added simultaneously, the soil of reinforcing after the reaction was completed is subjected to filter-press dehydration and obtains rehabilitating soil；Precipitating reagent is added in waste water obtained by filters pressing, flocculant carries out purified treatment, residual waste solution after separating beavy metal is transported in the spray tube of elution column upper end by second circulation pump, it is reused as leacheate, operation of the present invention is simple, repairing efficiency is short and at low cost.
Description
Technical field
The present invention relates to heavy metal pollution of soil fields, and in particular to a kind of chemical leaching for heavy metal pollution of soil
Method.
Background technique
Recently as industry rapid development and mankind's activity frequent increase, largely the waste water containing heavy metal,
Waste residue is discharged into soil after the processing without stringent high standard.Due to the high cumulative bad of heavy metal, concealment and
The features such as bio-refractory, a large amount of soil is not only resulted in can not cultivate and lie on the table, but also can be acted on by food chain,
Jeopardize the health of human body.Heavy-metal contaminated soil especially Industrial Wasteland serious pollution soil is repaired and administered
As environmental problem urgently to be resolved.
Heavy-metal contaminated soil chemical leaching renovation technique, which carries out classification according to soil treatment position, can be divided into situization
Learn elution and ex-situ chemical washing.The elution of heavy-metal contaminated soil in-situ chemical is carried out in heavy-metal contaminated soil same court
It repairs；Its principle is the depth being distributed according to heavy metal contaminants, and chemical leaching liquid is allowed to flow under the action of gravity or external force
By contaminated soil, and leacheate is collected and removed using recovery well or using the method for ditching.There is leaching in in-situ chemical elution
Lotion separates that eluent residual quantity in, soil big compared with difficult, water consumption is big, low efficiency and two with soil insufficient contact, water and soil
The defects of secondary pollution is difficult to control.Heavy-metal contaminated soil ex-situ chemical washing is transported contaminated soil to elsewhere
Soil remediation area is repaired；Its principle is that be sufficiently mixed chemical leaching liquid with contaminated soil using external force will be dirty
Dye object is transferred in leacheate, then handle achieving the purpose that pollutant removal by the pollutant in leacheate.
Heavy-metal contaminated soil ex-situ chemical washing method comprises the following steps: (1) excavation of heavy-metal contaminated soil；(2) heavy metal
The chemical leaching of contaminated soil；(3) separation of solid and liquid of heavy-metal contaminated soil；(4) processing and disposition of Pollutants in Wastewater；
(5) disposition of final soil.Heavy-metal contaminated soil ex-situ chemical washing exists to equipment dependency degree height, power consumption is big, repairs
The defects of at high cost.
Summary of the invention
(1) technical problems to be solved
In order to overcome the shortage of prior art, it is proposed that a kind of chemical leaching method for heavy metal pollution of soil, it is above-mentioned to solve
The problem of being proposed in background technique.
(2) technical solution
Of the invention is achieved through the following technical solutions: the invention proposes a kind of chemical leachings for heavy metal pollution of soil
Method, comprising the following steps:
1) heavy-metal contaminated soil is put into elution column, inorganic leacheate from top to bottom elutes soil, after elution
In waste collection to the dashpot of elution column bottom,
2) the heap block after the completion of pre-invasion is dug, and is sieved,
3) soil after screening is transferred in chemical reaction kettle, is stirred reinforcing reaction, while adding chemical leaching liquid,
4) soil of reinforcing after the reaction was completed is subjected to filter-press dehydration and obtains rehabilitating soil；Precipitating is added in waste water obtained by filters pressing
Agent, flocculant carry out purified treatment,
5) residual waste solution after separating beavy metal is transported in the spray tube of elution column upper end by second circulation pump, as leaching
Washing lotion recycling.
Furthermore, the inorganic elution Ji is formed by sodium chloride and inorganic acid mixed preparing.
Furthermore, the inorganic acid is hydrochloric acid, sulfuric acid or nitric acid, and pH value is between 3~4.
Furthermore, the sodium chloride dosage is 100~200g/L.
Furthermore, the heap block product is 4~10m3.
Furthermore, the time of the pre-invasion is 20~26 hours.
Furthermore, the time for strengthening reaction is the contaminated soil to be processed relative to every 10m3 volume, is strengthened
Reaction 30 minutes.
(3) beneficial effect
The present invention compared with the existing technology, has the advantages that
A kind of chemical leaching method for heavy metal pollution of soil that the present invention mentions elutes high concentration using inorganic leacheate
Heavy-metal contaminated soil, efficiently and rapidly remove heavy metal in soil；Meanwhile elution is handled using electrodeposition process and is given up
Liquid not only effectively prevents the waste liquid for generating secondary pollution, the heavy metal in timely Recycling of waste liquid, and can be recycled surplus
Waste liquid can save a large amount of inorganic acid and water resource, and the pre-invasion stage generates without waste liquid, more saving water resource, will not
Secondary pollution is carried out to soil, in each technique after the pre-invasion stage, soil is in wet state, can be to avoid
Secondary pollution caused by the fugitive dust of construction site and to construction personnel's health bring damage, combine original position, ex-situ chemical washing
The respective advantage of method, heavy metal removing rate are above the removal effect for individually using both elution methods；And it is required
Repair time is well below repair time needed for in-situ chemical elution method.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments,
The present invention will be described in further detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
Embodiment
Heavy-metal contaminated soil is put into elution column, inorganic leacheate from top to bottom elutes soil, useless after elution
Liquid is collected into the dashpot of elution column bottom；Wherein, inorganic elution Ji is formed by sodium chloride and inorganic acid mixed preparing, nothing
Machine acid is hydrochloric acid, sulfuric acid or nitric acid, and for pH value between 3~4, sodium chloride dosage is 100~200g/L.
Heap block after the completion of pre-invasion is dug, and is sieved.
Soil after screening is transferred in chemical reaction kettle, is stirred reinforcing reaction, while adding chemical leaching
The volume ratio of liquid, chemical leaching liquid and contaminated soil to be processed is 1.8: 1, and the time for strengthening reaction is 50 minutes.
The soil of reinforcing after the reaction was completed is obtained into rehabilitating soil through filter-press dehydration；Precipitating is added in waste water obtained by filters pressing
Agent, flocculant carry out purified treatment, can be recycled.
Heavy-metal contaminated soil is put into elution column, by inorganic acid (hydrochloric acid, sulfuric acid or nitric acid etc.) and sodium chloride mixture
Inorganic leacheate soil is eluted from top to bottom, the waste collection after elution to elution column bottom dashpot in；Benefit
Waste liquid is sent into electro-deposition tank from dashpot with circulating pump, carries out heavy metal separation in electro-deposition tank；Under electric field action, give up
Metal cation deposits on cathode in liquid, and residual waste solution passes through another circulation again and is pumped into the top of elution column as elution
Liquid reuse.
It illustrates
The first: weighing 1.2kg pollution sand, and the content for polluting Pb in sand is 615mg/kg, 400 meshes of earth pillar bottom
Net is fixed, and is added by the NaCl of 200g/L and the leacheate of a small amount of hydrochloric acid, pH=3, leacheate slowly drenches from top to bottom from cylinder
Contaminated soil is washed, ring waste is collected through baffle-box, is pumped into electro-deposition tank through wriggling, and 1 yin is equipped among electro-deposition tank
Pole graphite electrode, tank inner periphery are uniformly distributed 6 anode graphite electrodes, and DC power supply is connected between electrode, and electro-deposition separation is useless
Heavy metal in liquid, residual waste solution are sent elution column top back to by peristaltic pump again and are eluted to contaminated soil.Through cycling elution
After 3h, the concentration of Pb is reduced to 29.3mg/kg in remaining sand.
Second: weighing 1.2kg pollution sand, the content for polluting Cd in sand is 462mg/kg, and earth pillar bottom is with 400
Mesh screen is fixed, be added by the NaCl of 100g/L and the leacheate of a small amount of sulfuric acid, pH=3.5, leacheate from cylinder from top to bottom
Slowly elution contaminated soil, ring waste are collected through baffle-box, are pumped into electro-deposition tank through wriggling, are set among electro-deposition tank
There is 1 cathode graphite electrode, tank inner periphery is uniformly distributed 6 anode graphite electrodes, and DC power supply is connected between electrode, and electricity is heavy
It integrates from heavy metal in waste liquid, residual waste solution is sent elution column top back to by peristaltic pump again and eluted to contaminated soil.Through following
After ring elutes 3h, the concentration of Cd is reduced to 52.6mg/kg in remaining sand.
The third: weighing 1.2kg pollution sand, and the content for polluting Cu in sand is 518mg/kg, and earth pillar bottom is with 400
Mesh screen is fixed, and is added by the NaCl of 200g/L and the leacheate of a small amount of nitric acid, pH=4, leacheate delays from top to bottom from cylinder
Slow elution contaminated soil, ring waste are collected through baffle-box, are pumped into electro-deposition tank through wriggling, and 1 is equipped among electro-deposition tank
Root cathode graphite electrode, tank inner periphery are uniformly distributed 6 anode graphite electrodes, and DC power supply, electro-deposition point are connected between electrode
From heavy metal in waste liquid, residual waste solution is sent elution column top back to by peristaltic pump again and is eluted to contaminated soil.Through recycling
After eluting 3.5h, the concentration of Cu is reduced to 39.8mg/kg in remaining sand.
A kind of chemical leaching method for heavy metal pollution of soil that the present invention mentions, easy to operate, repairing efficiency it is short and
It is at low cost.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to structure of the invention
Think and range is defined.Without departing from the design concept of the invention, ordinary people in the field is to technology of the invention
The all variations and modifications that scheme is made, should all drop into protection scope of the present invention, the claimed technology contents of the present invention,
It is all described in the claims.
Claims (7)
1. a kind of chemical leaching method for heavy metal pollution of soil, it is characterised in that: the following steps are included:
1) heavy-metal contaminated soil is put into elution column, inorganic leacheate from top to bottom elutes soil, after elution
In waste collection to the dashpot of elution column bottom,
2) the heap block after the completion of pre-invasion is dug, and is sieved,
3) soil after screening is transferred in chemical reaction kettle, is stirred reinforcing reaction, while adding chemical leaching liquid,
4) soil of reinforcing after the reaction was completed is subjected to filter-press dehydration and obtains rehabilitating soil；Precipitating is added in waste water obtained by filters pressing
Agent, flocculant carry out purified treatment,
5) residual waste solution after separating beavy metal is transported in the spray tube of elution column upper end by second circulation pump, as leaching
Washing lotion recycling.
2. a kind of chemical leaching method for heavy metal pollution of soil according to claim 1, it is characterised in that: the nothing
Machine elution Ji is formed by sodium chloride and inorganic acid mixed preparing.
3. a kind of chemical leaching method for heavy metal pollution of soil according to claim 2, it is characterised in that: the nothing
Machine acid is hydrochloric acid, sulfuric acid or nitric acid, and pH value is between 3~4.
4. a kind of chemical leaching method for heavy metal pollution of soil according to claim 2, it is characterised in that: the chlorine
Change sodium dosage is 100~200g/L.
5. a kind of chemical leaching method for heavy metal pollution of soil according to claim 1, it is characterised in that: the heap
Block product is 4~10m3.
6. a kind of chemical leaching method for heavy metal pollution of soil according to claim 1, it is characterised in that: described pre-
The time of infiltration is 20~26 hours.
7. a kind of chemical leaching method for heavy metal pollution of soil according to claim 1, it is characterised in that: described strong
Change the time of reaction as the contaminated soil to be processed relative to every 10m3 volume, strengthens reaction 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711357491.5A CN109926444A (en) | 2017-12-16 | 2017-12-16 | A kind of chemical leaching method for heavy metal pollution of soil |
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| CN201711357491.5A CN109926444A (en) | 2017-12-16 | 2017-12-16 | A kind of chemical leaching method for heavy metal pollution of soil |
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| CN109926444A true CN109926444A (en) | 2019-06-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208277A (en) * | 2020-01-16 | 2020-05-29 | 北京科技大学 | Coupling up-flow type device for adsorbing heavy metal in soil |
| CN112605111A (en) * | 2020-11-26 | 2021-04-06 | 中国人民解放军63653部队 | Function-modularized plutonium-polluted soil ex-situ leaching decontamination method |
-
2017
- 2017-12-16 CN CN201711357491.5A patent/CN109926444A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111208277A (en) * | 2020-01-16 | 2020-05-29 | 北京科技大学 | Coupling up-flow type device for adsorbing heavy metal in soil |
| CN111208277B (en) * | 2020-01-16 | 2020-12-29 | 北京科技大学 | Coupling up-flow type device for adsorbing heavy metal in soil |
| CN112605111A (en) * | 2020-11-26 | 2021-04-06 | 中国人民解放军63653部队 | Function-modularized plutonium-polluted soil ex-situ leaching decontamination method |
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