CN106433649A - Chemical eluting agent for repairing mercury polluted soil and application method of chemical eluting agent - Google Patents
Chemical eluting agent for repairing mercury polluted soil and application method of chemical eluting agent Download PDFInfo
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- CN106433649A CN106433649A CN201610842825.7A CN201610842825A CN106433649A CN 106433649 A CN106433649 A CN 106433649A CN 201610842825 A CN201610842825 A CN 201610842825A CN 106433649 A CN106433649 A CN 106433649A
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- agent
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- eluent
- eluting
- drip washing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a chemical eluting agent for repairing mercury polluted soil and an application method of the chemical eluting agent, and belongs to the technical field of polluted soil repairing. The eluting agent is composed of an independent agent A and an independent agent B. The agent A comprises a hydrochloric acid solution, a potassium iodide solution and a sodium thiosulfate solution. The agent B comprises a sodium hydroxide solution and a sodium hypochlorite solution. The application method of the chemical eluting agent includes the following steps of firstly, preprocessing and smashing the soil and picking out impurities, stones and the like; secondly, adding the eluting agent A and the mercury polluted soil according to the ratio of the polluted soil to the eluting agent being 1:10-1:20 for continuous or intermittent stirring for 4-8 h; thirdly, adding water to residual soil after solid-liquid separation for cleaning and eluting; fourthly, adding the eluting agent B to the soil obtained after cleaning and eluting in the third step for continuous or intermittent stirring for 4-8 h; fifthly, conducting direct backfilling after adding water to residual soil for cleaning and eluting after solid-liquid separation. The method mainly includes the two steps of eluting, and the mercury content in the soil is effectively reduced by means of the different eluting agent A and eluting agent B.
Description
Technology neighborhood
The invention belongs to contaminated soil remediation technology neighborhood, and in particular to the eluent in chemical leaching reparation is prepared and made
Use method.
Background technology
Due to greatly developing for agriculture, industrial, mining industry, serious environmental pollution is caused while economic development and is asked
Topic.Wherein, soil pollution is due to the features such as with latency, stability, chronicity, it is difficult to fast and effectively administered.Hydrargyrum is
A kind of non-essential element with high toxicity, as element mercury and its multiple organic compound have higher volatilization
Property, it is easy to Transport And Transformation in the environment, and human body is entered by food chain and irreversible harm is caused, therefore, hydrargyrum conduct
Global environmental contaminants are received much concern.At 2 months 2006, " the global hydrargyrum that United Nations Environment Programme (UNEP) delivers
Point out in condition evaluation " report：Since the industrial revolution, content of the hydrargyrum in global atmosphere, water and soil increased 3 times of left sides
The right side, near industrial occupancy, the content of hydrargyrum is higher, and the continuous aggravation of mercury pollution causes high risks to human health and environment, in the whole world
Generate great adverse effect.
For at present, soil moved in improve the original soil replacement method, thermal desorption, phytoremediation etc. are mainly adopted for the reparation of mercury contaminated soil, but
All there is respective weakness and weak point in these methods, for example：Soil moved in improve the original soil removal and replacement process needs to clean clean soil in a large number；Heat
Desorption process needs to consume mass energy, and expense is higher；Time required for phytoremediation is long while soil can be subject to
The impact of the conditions such as earth, landform, weather.Chemical leaching is primarily referred to as using water, eluent or other materials by pollutant from soil
Leach out in earth, even gas bleed soil, so that the heavy metal in soil is transferred among liquid, obtain clean soil
Earth, then the method for processing, recycling is carried out to solution.Compared with other recovery techniques, the speed of chemical leaching faster, drip washing
Efficiency is higher, and the energy of consumption is also relatively fewer.The key of chemical leaching is to find effective eluent, can either be quickly effective
Drip washing go out soil contaminant, and the impact to environment is less.Therefore, the present invention is developed from the angle of eluent
A kind of new and effective chemical leaching, for repairing the soil of mercury pollution.
Content of the invention
Present invention generally provides a kind of chemical leaching for repairing mercury contaminated soil and its application process, the eluent
Constitute eluent A and eluent B by two parts, multistep drip washing, removal soil Hg polluter that can be rapidly and efficiently, while this
Invention is there is provided the application process of the eluent.Mainly include herein below：
A kind of chemical leaching for repairing mercury contaminated soil, it is characterised in that the eluent is by independent A agent and B
Agent constitutes, and wherein A agent is mainly made up of hydrochloric acid, potassium iodide and hypo solution, and B agent is mainly by sodium hydroxide and hypochlorous acid
Sodium solution constitutes.In the present invention, in eluent A, the concentration of hydrochloric acid, potassium iodide and sodium thiosulfate is 0.3-1.0mol/L, drenches
In lotion B concentration of sodium hydroxide solution be 0.3-1.0mol/L, liquor natrii hypochloritises' mass percent concentration be 5%-20%.
A kind of application process for repairing the chemical leaching of mercury contaminated soil, it is characterised in that comprise the steps：
(1) soil pretreatment, mercury contaminated soil is crushed, and chooses the debris such as branch, stone；
(2) by A agent and mercury contaminated soil mixing drip washing, it is 1 with the mass ratio of A agent to keep mercury pollution soil:10—1:20,
Continue or 4 8h of intermittent stirring；
(3) after step (2) carries out solid-liquid separation, eluent A agent is recycled through processing, and residual soil adds water and carries out clearly
Recycle after clean drip washing, preferably wastewater purification；
(4) soil after the drip washing of step (3) water cleaning adds eluent B agent, preferably the soil after the drip washing of water cleaning and B agent
Mass ratio is 1:10—1:20, continue for or 4 8h of intermittent stirring；
(5) after step carries out solid-liquid separation, eluent B agent is recycled through processing, and residual soil adds water and is cleaned
Directly can backfill after drip washing, preferably recoverable after wastewater purification.
A kind of chemical leaching for repairing mercury contaminated soil, it is characterised in that eluent A and eluent B are
Point process, carry out drip washing step by step；Lessivation uses eluent B drip washing first with eluent A, afterwards.
A kind of application process for repairing the chemical leaching of mercury contaminated soil, it is characterised in that step (2) and
(4) in, after adding eluent A or eluent B in contaminated soil, continue or 4 8h of intermittent stirring, intermittence here is stirred
Mixing and referring to 15-20 minute be stirred every half an hour, control total reaction time is 4 8h.
A kind of application process for repairing the chemical leaching of mercury contaminated soil, it is characterised in that step (3)
In, after eluent A drip washing terminates, need eluent is reclaimed, can achieve after process to recycle.While the soil after drip washing
Earth needs to reuse eluent B after water cleaning drip washing, prevents chemical reaction between eluent A and eluent B.
A kind of application process for repairing the chemical leaching of mercury contaminated soil, it is characterised in that step (5)
In, adopting after eluent B drip washing and eluent is used water as, drip washing is cleaned, reducing the residual of eluent in soil, while entering
One step washes the heavy metal ion of upper soll layer absorption off.Water wherein after drip washing recoverable after processing, after drip washing
Soil directly can backfill.
A kind of application process for repairing the chemical leaching of mercury contaminated soil of the present invention, it is characterised in that chemistry drenches
Wash, water is cleaned in lessivation and keeps Tu Shui ratio for 1:10—1:20, can more efficiently play the drip washing effect of eluent.
The present invention is advantageous in that the chemical leaching of the application present invention can be fast and effectively compared to other techniques
Reduce the polluter in soil, while the time that repairs is shorter, it is less to spend, repair for mercury contaminated soil chemical leaching is promoted
The development of recovering technology has great importance.
Specific embodiment
With reference to embodiment, the invention will be further described, but the present invention is not limited to following examples.
Embodiment 1
Collection Hunan chemical pollution soil, wherein soil mercury content are that 3.9mg/kg, soil is through natural air drying, remove impurity
Afterwards, crush, excessively standby after the sieve of 100 mesh.It is respectively configured eluent A and eluent B, hydrochloric acid, potassium iodide in wherein eluent A
Concentration with hypo solution is 0.3mol/L, and in eluent B, concentration of sodium hydroxide solution is 0.4mol/L, sodium hypochlorite
Solution concentration is 5%.Pretreated soil 5g is weighed in the centrifuge tube of 100ml, plus eluent A50ml, continuously shake 8h
Afterwards, centrifugation, abandoning supernatant.Residual soil adds water and shakes 1h, is cleaned drip washing, in remaining soil after abandoning supernatant
Among add eluent B 50ml, continuously shake 8h, centrifugation, abandoning supernatant.Add water in residual soil concussion 1h, cleaning
Soil is obtained after drip washing, the mercury content after air-drying and processing among measure, remaining soil mercury content is obtained for 1.1mg/kg, Mercury in Soil
Reduction rate be 71.8%.
Claims (7)
1. a kind of chemical leaching for repairing mercury contaminated soil, it is characterised in that the eluent is by independent A agent and B agent
Composition, wherein A agent is mainly made up of hydrochloric acid, potassium iodide and hypo solution, and B agent is mainly by sodium hydroxide and sodium hypochlorite
Solution composition.
2. according to a kind of chemical leaching for repairing mercury contaminated soil described in claim 1, it is characterised in that in A agent
The concentration of hydrochloric acid, potassium iodide and sodium thiosulfate is 0.3-1.0mol/L, and in eluent B agent, concentration of sodium hydroxide solution is
0.3-1.0mol/L, liquor natrii hypochloritises' mass percent concentration are 5%-20%.
3. the using method for repairing the chemical leaching of mercury contaminated soil of claim 1 or 2, it is characterised in that include
Following steps：
(1) soil pretreatment, mercury contaminated soil is crushed, and chooses debris；
(2) by A agent and mercury contaminated soil mixing drip washing, it is 1 with the mass ratio of A agent to keep mercury pollution soil:10—1:20, continue
Or 4 8h of intermittent stirring；
(3), after step (2) carries out solid-liquid separation, residual soil adds water and is cleaned drip washing；
(4) soil after the drip washing of step (3) water cleaning adds eluent B agent to continue for or 4 8h of intermittent stirring；
(5) after step carries out solid-liquid separation, eluent B agent is recycled through processing, and residual soil adds water and is cleaned drip washing
After directly can backfill.
4. according to the method for claim 3, it is characterised in that the soil after the cleaning drip washing of step (4) water and the mass ratio of B agent
For 1:10—1:20.
5. according to the method for claim 3, it is characterised in that after step (3) solid-liquid separation, eluent A agent reclaims profit through processing
With；After step (5) solid-liquid separation, eluent B agent is recycled through processing.
6. according to the method for claim 3, it is characterised in that step (3) and step (5) residual soil add water and is cleaned drip washing
Recoverable after wastewater purification afterwards.
7. according to the method for claim 3, it is characterised in that in step (2) and (4), in contaminated soil add eluent A agent or
After eluent B agent, continue or 4 8h of intermittent stirring, intermittent stirring here refers to divide every half an hour stirring 15-20
Clock, control total reaction time is 4 8h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610842825.7A CN106433649A (en) | 2016-09-22 | 2016-09-22 | Chemical eluting agent for repairing mercury polluted soil and application method of chemical eluting agent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610842825.7A CN106433649A (en) | 2016-09-22 | 2016-09-22 | Chemical eluting agent for repairing mercury polluted soil and application method of chemical eluting agent |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107350284A (en) * | 2017-08-16 | 2017-11-17 | 航天凯天环保科技股份有限公司 | A kind of efficient restorative procedure of mercury contaminated soil |
| CN107398470A (en) * | 2017-08-24 | 2017-11-28 | 航天凯天环保科技股份有限公司 | A kind of method that mercury contaminated soil is repaired in low temperature thermal desorption amalgamation elution |
| CN107413823A (en) * | 2017-08-24 | 2017-12-01 | 航天凯天环保科技股份有限公司 | A kind of method that mercurous dangerous waste residue is administered in low temperature thermal desorption amalgamation elution |
| CN107457258A (en) * | 2017-08-16 | 2017-12-12 | 航天凯天环保科技股份有限公司 | A kind of method that mercury contaminated soil is efficiently repaired by eluting and elution medicament |
| CN107520248A (en) * | 2017-09-12 | 2017-12-29 | 贵州省草业研究所 | A kind of method that crops repair farmland mercury contaminated soil |
| CN107569811A (en) * | 2017-08-16 | 2018-01-12 | 航天凯天环保科技股份有限公司 | A kind of method of mercurous dangerous waste residue Whote-wet method high-efficiency mercury removal |
| CN115446100A (en) * | 2022-08-17 | 2022-12-09 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green restoration method and device |
| CN116062936A (en) * | 2023-01-11 | 2023-05-05 | 重庆大学 | Three-dimensional view constructed wetland |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107350284B (en) * | 2017-08-16 | 2020-02-04 | 航天凯天环保科技股份有限公司 | Efficient remediation method for mercury-contaminated soil |
| CN107457258A (en) * | 2017-08-16 | 2017-12-12 | 航天凯天环保科技股份有限公司 | A kind of method that mercury contaminated soil is efficiently repaired by eluting and elution medicament |
| CN107569811A (en) * | 2017-08-16 | 2018-01-12 | 航天凯天环保科技股份有限公司 | A kind of method of mercurous dangerous waste residue Whote-wet method high-efficiency mercury removal |
| CN107350284A (en) * | 2017-08-16 | 2017-11-17 | 航天凯天环保科技股份有限公司 | A kind of efficient restorative procedure of mercury contaminated soil |
| CN107569811B (en) * | 2017-08-16 | 2020-02-04 | 航天凯天环保科技股份有限公司 | Method for efficiently removing mercury from mercury-containing hazardous waste residue by using full-wet method |
| CN107398470A (en) * | 2017-08-24 | 2017-11-28 | 航天凯天环保科技股份有限公司 | A kind of method that mercury contaminated soil is repaired in low temperature thermal desorption amalgamation elution |
| CN107413823A (en) * | 2017-08-24 | 2017-12-01 | 航天凯天环保科技股份有限公司 | A kind of method that mercurous dangerous waste residue is administered in low temperature thermal desorption amalgamation elution |
| CN107413823B (en) * | 2017-08-24 | 2020-10-02 | 航天凯天环保科技股份有限公司 | Method for treating mercury-containing dangerous waste residues by combining low-temperature thermal desorption with chemical leaching |
| CN107520248A (en) * | 2017-09-12 | 2017-12-29 | 贵州省草业研究所 | A kind of method that crops repair farmland mercury contaminated soil |
| CN115446100A (en) * | 2022-08-17 | 2022-12-09 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green restoration method and device |
| CN115446100B (en) * | 2022-08-17 | 2024-03-22 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green repair method and device |
| CN116062936A (en) * | 2023-01-11 | 2023-05-05 | 重庆大学 | Three-dimensional view constructed wetland |
| CN116062936B (en) * | 2023-01-11 | 2024-05-24 | 重庆大学 | Three-dimensional view constructed wetland |
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Application publication date: 20170222 |
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