CN109226246A - A kind of method of arsenic and organic material contaminated soil reparation - Google Patents
A kind of method of arsenic and organic material contaminated soil reparation Download PDFInfo
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- CN109226246A CN109226246A CN201811402050.7A CN201811402050A CN109226246A CN 109226246 A CN109226246 A CN 109226246A CN 201811402050 A CN201811402050 A CN 201811402050A CN 109226246 A CN109226246 A CN 109226246A
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- soil
- arsenic
- organic
- organic material
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Classifications
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
-
- 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
Abstract
The present invention provides the method for a kind of arsenic and organic material contaminated soil reparation, first by the soil breaking of arsenic and organic pollution plot, sodium citrate solution, hydrogenperoxide steam generator and frerrous chloride powder is added, carries out mixing 30min, soil mixture is obtained by filtration；Suitable iron powder is added；It is sent into vacuum heat treatment device, is heated to 200 DEG C or more, keeps the temperature 30min, the arsenic chloride and low molecule organic matter in soil volatilize from soil, realize the separation with soil.Obtained soil is eluted using pure water, the iron ion in soil is separated into water, then suitable lime powder is added into the soil after elution, is uniformly mixed, soil is adjusted to alkalescent, the soil after being repaired.Organic complex and polymer substance in soil can be effectively treated in the present invention, and converts low boiling point volatile materials for arsenic, and the simple advantage easy to operate, regulation effect is good of method can remove arsenic and organic matter from soil.
Description
Technical field:
The present invention relates to soil pollution recovery technique fields, and in particular to a kind of side of arsenic and organic material contaminated soil reparation
Method.
Technical background:
National annual 180~2,000,000 people of pathogenesis of cancer number, dead 140~1,500,000 people, to a certain extent with agricultural product
It pollutes exceeded related.Heavy metal pollution of soil is gradually at the focal issue of public concern.
Heavy, sewage irrigation and the pesticide containing arsenic the sprinkling mainly from atmosphere drop of soil arsenic pollution.Chinese topsoil arsenic contains
Amount be in north-south Regional Distribution, height above sea level higher area soil arsenic content be higher than height above sea level lower, by Qinghai-Tibet area, southwest
North is successively decreased eastwards for area, south China area, is etched between object that there is geochemistry to contact with its upstream.Wherein in regional area
Interior, from high to low with landform, the content of arsenic also has distribution characteristics from high to low in soil.What China generated every year contains arsenic
Waste residue amount about 500,000 t, accumulating untreated arsenic-containing waste residue amount is 2,000,000 t.Arsenic-containing waste residue is piled up arbitrarily so that a large amount of
Arsenic is transferred in soil, so in the area that arsenic minerals is exploited and smelted, especially severe the problem of As polluted soil.In addition, organic
Object is a great representative type organic in soil organic pollutant, therefore is easy to enter the ecosystem by biological chain,
And there is build-up effect, seriously endanger human health and ecological safety.
In soil remediation, the existing forms of arsenic are that the soil arsenic pollution with ionic forms, in face of being on the rise is asked mostly
Topic all increasingly payes attention to research and application to various arsenic in soil pollution remediation technologies in the world.As polluted soil is repaired main
It is divided into two kinds of approach: 1. changes the existing forms of arsenic in contaminated soil, so that it is converted into stable state by activated state, arsenic is reduced with this
Migration and bioavailability in the environment weaken its toxicity to plant and animal；2. arsenic removal is gone from contaminated soil,
Reach recycling and reduce the dual purpose of heavy metal in soil, so that it is retained concentration and be close to or up to background value.Currently, common
As polluted soil recovery technique mainly includes curing/stabilizing reparation, elution reparation, microorganism remediation, phytoremediation and electronic
Repair etc..
It is main to use (1) soil moved in improve the original, soil replacement method for organic pollution of soil；Soil moved in improve the original, soil replacement method are most commonly seen physics
Administering method.This method is to transport the soil by organic contamination, is sent to designated place and fills and handle, and is then filled out back clean
Soil, to reduce the content of organic pollutant.This method required cost is high, and is only shifted to pollutant, is easy
Secondary pollution is caused, so being only adapted to soil treatment in special circumstances.(2) ventilation decontamination method；Ventilation decontamination method be mainly
A kind of new method to grow up for hydrocarbon contamination of soil caused by Oil spills.Since organic hydrocarbon has higher volatilization
Property, therefore can be by digging a well in contaminated areas, and cause cross-ventilation and accelerate the volatilization of pollutant and remove soil pollution.Zheng Yuan
Report is raised, soil pollution is exactly successfully to be administered with this method caused by one air base of the U.S. is leaked because of fuel.By
In ventilation removal efficiency be affected by various factors, thus existing correlative study can't have to its detergency mechanism one very
Good explanation, still need to carry out with regard to this method deeper into research.(3) heat treating process；Heat treating process is will by engineering measure
Contaminated soil removes, and drives soil out of using the various heating means property of will volatilize organic pollutants, then it is collected and is located
A kind of Ex-situ remediation method of reason.
But it is administered for arsenic and organic matter organic pollution, prior art remediation efficiency is low, processing cost is high, can not be effective
The problems such as removing heavy metal pollution of soil source.Therefore, it is necessary to learn from other's strong points to offset one's weaknesses from existing various methods, by arsenic from Polluted Soil
It is removed in earth, realizes the thorough stabilization of soil remediation effect.
Summary of the invention:
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide the side of a kind of arsenic and organic material contaminated soil reparation
Arsenic in soil is reduced into lower valency arsenic, then lower valency arsenic and organic matter is separated from soil by method.
A kind of method of arsenic and organic material contaminated soil reparation of the present invention, is specifically realized using following step:
(1), the soil of arsenic and organic pollution plot is dug out, the soil particle of 2~5mm is processed by crusher；
(2), sodium citrate solution is configured, soil particle is added in configured sodium citrate solution in the ratio of 1L/kg,
Suitable hydrogenperoxide steam generator and frerrous chloride powder are added, mixing 30min is carried out, by the polymer in organic matter
Matter is degraded to lower-molecular substance, and soil mixture is obtained by filtration；
(3), suitable iron powder is added into soil mixture, is sufficiently stirred, converts three for five valence state arsenic in soil
Valence state arsenic ion forms volatile arsenic chloride；
(4), the soil for obtaining step (3) is sent into vacuum heat treatment device, is heated to 200 DEG C or more, keeps the temperature 30min,
Arsenic chloride and low molecule organic matter in soil volatilize from soil, realize the separation with soil.
(5), the soil for obtaining step (4) is eluted using pure water, and the iron ion in soil is separated into water, then to leaching
Suitable lime powder is added in soil after washing, is uniformly mixed, soil is adjusted to alkalescent, the soil after being repaired
Earth.
A kind of method of arsenic and organic material contaminated soil reparation of the present invention, the concentration of the sodium citrate are 0.5-2mol/
L。
A kind of method of arsenic and organic material contaminated soil reparation of the present invention, it is native in sodium citrate solution in the step (2)
Earth pH value is 4-5.
A kind of method of arsenic and organic material contaminated soil reparation of the present invention, in the step (4), system when vacuum heat treatment
Pressure is not more than 1Kpa.
Technical principle:
Soil is subjected to break process first, soil is sufficiently dissociated, particulate matter is obtained；Then sodium citrate is used
Immersion treatment is carried out to soil, so that soil colloid is added hydrogen peroxide and frerrous chloride, is formed in the soil liquid in acidity
Fenton's reaction system, the macromolecule organic in soil are oxidized to low molecule organic matter, the lower item of the boiling point of low molecule organic matter,
It is easy to be thermally decomposed；And heavy metal arsenic ion obtains trivalent arsenic by iron powder reducing, due to containing iron chloride in soil, it is easy to
Combined chloride forms arsenic trichloride, and the boiling point of arsenic trichloride is lower, and only 130.2 DEG C, when by being heated to 200 DEG C or more, soil
In low molecule organic matter and arsenic trichloride it is heated be volatilized into gaseous state object, separated from soil；Due to remained in soil iron from
Son, iron ion are water-soluble forms, are further eluted with pure water, and the iron ion in soil is separated into water, then to after elution
Soil in suitable lime powder is added, be uniformly mixed, soil is adjusted to alkalescent, the soil after being repaired.
Compared with prior art, the present invention has few using thermal energy consumption, and the organic complex in soil can be effectively treated
And polymer substance, and low boiling point volatile materials is converted by arsenic, the simple advantage easy to operate, regulation effect is good of method,
Arsenic and organic matter can be removed from soil, achieve the purpose that Long term control.
Detailed description of the invention:
Fig. 1 is the process flow chart of a kind of method of arsenic and organic material contaminated soil reparation.
Specific embodiment:
The soil of arsenic and oil pollution plot is dug out, sampling Detection total Arsenic In Soil is 122.39mg/kg, oil content
963.23mg/kg takes 5kg pedotheque to be processed into the soil particle of 2~5mm by crusher；Configure 1mol/L sodium citrate
In the ratio of 1L/kg soil particle is added in configured sodium citrate solution by solution, and adjusting P in soil H value is 4, is added suitable
The hydrogenperoxide steam generator and frerrous chloride powder of amount, carry out mixing 30min, and the polymer substance in organic matter is aoxidized drop
Solution is lower-molecular substance, and soil mixture is obtained by filtration；Suitable iron powder is added into soil mixture, is sufficiently stirred, it will be native
Five valence state arsenic in earth are converted into three valence state arsenic ions, form volatile arsenic chloride；Soil is sent into vacuum heat treatment device,
System pressure 1Kpa is heated to 200 DEG C of heat preservation 30min, and the arsenic chloride and low molecule organic matter in soil volatilize from soil, real
Now with the separation of soil.Soil is eluted using pure water, the iron ion in soil is separated into water, then to the soil after elution
It is middle that suitable lime powder is added, it is uniformly mixed, soil is adjusted to alkalescent, the soil after being repaired.Through detection soil
Arsenic content is 0.89mg/kg, oil content 23.42mg/kg in earth, is met " standard of soil environment quality " (GB15618-1995)
The requirement of second level agricultural soil.
Claims (4)
1. a kind of method of arsenic and organic material contaminated soil reparation, it is characterised in that: specifically realized using following step:
(1), the soil of arsenic and organic pollution plot is dug out, the soil particle of 2~5mm is processed by crusher；
(2), sodium citrate solution is configured, in the ratio of 1L/kg by configured sodium citrate solution addition soil particle, then plus
Enter suitable hydrogenperoxide steam generator and frerrous chloride powder, carry out mixing 30min, by the polymer substance oxygen in organic matter
Change is degraded to lower-molecular substance, and soil mixture is obtained by filtration；
(3), suitable iron powder is added into soil mixture, is sufficiently stirred, converts three valence states for five valence state arsenic in soil
Arsenic ion forms volatile arsenic chloride；
(4), the soil for obtaining step (3) is sent into vacuum heat treatment device, is heated to 200 DEG C or more, keeps the temperature 30min, soil
In arsenic chloride and low molecule organic matter volatilize from soil, realize and the separation of soil.
(5), the soil for obtaining step (4) is eluted using pure water, and the iron ion in soil is separated into water, then to after elution
Soil in suitable lime powder is added, be uniformly mixed, soil is adjusted to alkalescent, the soil after being repaired.
2. a kind of method of arsenic and organic material contaminated soil reparation according to claim 1, it is characterised in that: the lemon
The concentration of sour sodium is 0.5-2mol/L.
3. a kind of method of arsenic and organic material contaminated soil reparation according to claim 2, it is characterised in that: the step
(2) in, P in soil H value is 4-5 in sodium citrate solution.
4. a kind of method of arsenic and organic material contaminated soil reparation according to claim 3, it is characterised in that: the step
(4) in, system pressure is not more than 1KPa when vacuum heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402050.7A CN109226246A (en) | 2018-11-22 | 2018-11-22 | A kind of method of arsenic and organic material contaminated soil reparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402050.7A CN109226246A (en) | 2018-11-22 | 2018-11-22 | A kind of method of arsenic and organic material contaminated soil reparation |
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| Publication Number | Publication Date |
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| CN109226246A true CN109226246A (en) | 2019-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811402050.7A Withdrawn CN109226246A (en) | 2018-11-22 | 2018-11-22 | A kind of method of arsenic and organic material contaminated soil reparation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110560473A (en) * | 2019-08-21 | 2019-12-13 | 生态环境部环境规划院 | Stabilization method for soil fluoride and arsenic |
| CN113000589A (en) * | 2021-03-12 | 2021-06-22 | 中山大学 | Contaminated soil remediation method |
-
2018
- 2018-11-22 CN CN201811402050.7A patent/CN109226246A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110560473A (en) * | 2019-08-21 | 2019-12-13 | 生态环境部环境规划院 | Stabilization method for soil fluoride and arsenic |
| US11179758B2 (en) | 2019-08-21 | 2021-11-23 | Chinese Academy Of Environmental Planning | Method for stabilizing fluorides and arsenic in soil |
| CN113000589A (en) * | 2021-03-12 | 2021-06-22 | 中山大学 | Contaminated soil remediation method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20190118 |