CN107008747A - A kind of microwave reinforced oxidation elution combined remediation method in pollution of chromium place - Google Patents
A kind of microwave reinforced oxidation elution combined remediation method in pollution of chromium place Download PDFInfo
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- CN107008747A CN107008747A CN201710391994.8A CN201710391994A CN107008747A CN 107008747 A CN107008747 A CN 107008747A CN 201710391994 A CN201710391994 A CN 201710391994A CN 107008747 A CN107008747 A CN 107008747A
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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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- 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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Abstract
Combined remediation method is eluted the invention discloses a kind of microwave reinforced oxidation in pollution of chromium place.This method is by using microwave reinforced H2O2Oxidation, while oxidation efficiency is improved, it is to avoid use excess H2O2Cause to influence subsequently to elute effect, while also reducing the influence to soil texture and structure；Then eluted, safety non-pollution, reduced because eluting the interference to soil environment using chemical reagent, remediation efficiency is high, and rehabilitation cost is low, is especially suitable for the reparation of Cr activity indexs low contaminated soil remediation and Cr contaminated sites using water.Specifically include：(1) hydrogen peroxide is carried out microwave treatment, then removes treatment fluid with being mixed containing chromium soil, the soil sample after processing added water washing, and remove cleaning solution；(2) soil after step (1) processing is added into leacheate to be eluted.
Description
Technical field
The invention belongs to place heavy metal pollution of soil recovery technique field, and in particular to a kind of microwave in pollution of chromium place
Oxidation-elution combined remediation method.
Background technology
With industry, the fast development of agricultural, environmental pollution is increasingly serious, and soil is also inevitably by serious dirt
Dye, especially pollution of the heavy metal to soil not only directly threatens safe constitute of the lives and properties of the public, also gives economy hair
Exhibition and social stability bring great test.In recent years, heavy metal chromium pollution problem is highlighted further, and its pollutant has in soil
The features such as residence time length, disguise are by force, toxicity is big, and the healthy of people can be directly or indirectly endangered by food chain or even raw
Life, therefore, the improvement repair for pollution of chromium place is very urgent.
At present, the technology administered both at home and abroad for chromium-polluted soil mainly has chemical reduction method, solidification/stabilization method, electronic
Repairing method, bioanalysis, chemical leaching method etc., various methods have its scope of application and limitation, and such as chemical reduction method is to utilize
Hexavalent chrome reduction in chromium slag is trivalent chromium by reducing substances, but chromium do not removed by such a method from soil, and chromium is activated
There is the possibility of secondary pollution afterwards.Solidification method is to mix chromium slag with curing agent in solidification/stabilization method, and reduce its mobility or
Solid is formed, and stabilization method refers to the technology that noxious pollutant chromium is transformed into low soluble, hypotoxicity, low activity material, this two
The method of kind equally equally exists the risk of secondary pollution with chemical reduction method；Bioanalysis is carried out using plant, microorganism, animal
Soil remediation, but this method only limits low-concentration heavy metal pollution and repairing efficiency is long；Chemical leaching recovery technique then can be quickly by dirt
Dye thing is removed from soil, and the improvement of high density pollution soil is completed within a short period of time.
In soil, chromium mainly exists in the form of trivalent chromium and Cr VI.Trivalent chromium is main with Cr in soil3+、Cr
(OH)2+、Cr(OH)2 +、Cr(OH)3、Cr(OH)4 -、Cr(OH)5 2-Form is present.Trivalent chromium is native into after soil more than 90%
Earth is adsorbed and existed with the form of mixtures of chromium and the hydroxide of iron, so that the migratory activity of chromium is reduced, therefore relative danger
Evil is smaller.And Cr VI enters main with CrO after soil4 2-、HCrO4 -And Cr2O7 2-Form is present.However, Cr VI enters to bury
Only have seldom part is adsorbed to fix after earth, be largely free in the soil liquid.Therefore the diffusivity of Cr VI is strong, migration
Active big, toxicity is big.Proved by years'experiences, elution recovery technique is to remove that transfer ability is strong, and toxicity it is high six
Valency chromium is most easy, economic means.But, China standard of soil environment quality formulate be based on total Cr content in soil,
Trivalent chromium fixed in soil is removed even if elution is also difficult.Cr activity index is relatively low in especially most of contaminated soils, elution
Preferable repairing effect can not often be obtained.But Cr total concentrations are high in the most of Cr contaminated sites soil of China, and Polluted Soil
Cr activity index is relatively low in earth, and elution often only removes sexavalence Cr active in soil, and a small amount of remove is absorbed and fixed at soil
In trivalent Cr.And China's standard of soil environment quality is using soil total cr content as limits value.Therefore, depending merely on elution method can not
Obtain preferable repairing effect, it is impossible to meet national standard of soil environment quality requirement.Require consideration for how trivalent in soil
Cr is efficient, be economically and safely oxidized to sexavalence Cr, and then is removed from soil.Though chemical oxidizing agent has good oxidation effectiveness,
But secondary pollution is easily caused, environmental risk is big.Meanwhile, excessive oxidant can also aoxidize eluent, the follow-up elution effect of influence
Really.Therefore, the key one of Cr contaminated sites reparation is that small chemical oxidizing agent is influenceed on soil environment, and two are had to trivalent Cr
Higher oxidation efficiency, therefore need a kind of reparation new technology to chromium severe contamination place badly.
The content of the invention
For above-mentioned the deficiencies in the prior art, the present invention provides a kind of microwave reinforced oxidation in pollution of chromium place-elution connection
Close restorative procedure.This method is by using microwave reinforced H2O2Oxidation, while oxidation efficiency is improved, is greatly reduced
H2O2Consumption, it is to avoid use excess H2O2Cause to influence subsequently to elute effect, while also reducing the shadow to soil environment quality
Ring；Then eluted using water, safety non-pollution, reduce because eluting the interference to soil environment using chemical reagent, repair
Efficiency high, rehabilitation cost is low, is especially suitable for the reparation in the low contaminated soil remediation of Cr activity indexs and Cr severe contaminations place.
Specifically, the invention discloses a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place, bag
Include：
(1) hydrogen peroxide is carried out microwave treatment, treatment fluid is then removed, by the soil sample after processing with being mixed containing chromium soil
Add water washing, and removes cleaning solution；
(2) soil after step (1) processing is added into leacheate to be eluted.
Further, to carrying out hydrogen peroxide oxidation before processing containing chromium soil, soil is pre-processed, specific method
For：Ground 1-2mm sieves after chromium-polluted soil is air-dried will be contained；
Further, step (1) specific method is：Hydrogen peroxide is mixed with after pretreatment containing chromium soil, contained
The mass volume ratio of chromium soil and hydrogen peroxide is 1:1~5 (g：Ml (it is preferably) 1:4)；Hydrogen peroxide solution containing chromium-polluted soil
PH is 6~11；Microwave power is 200~800W, and microwave irradiation processing time is 8-12min；It is then centrifuged for or filters at removal
Manage liquid；Water is added into the soil sample after processing, cleaning solution is filtered or is centrifuged off in reciprocal concussion or stirring；
It is further preferred that the hydrogen peroxide concentration is 7%, it is 1 to add water to native liquid mass volume ratio:2~3 (g：Ml),
Reciprocal concussion or stirring 20~30 minutes；
In microwave link, it is determined that suitable oxidant concentration is very crucial for improving total chromium clearance.On the one hand
Suitable oxidant concentration can determine the cost performance of Practical Project, and best processing effect is obtained under minimum operating cost
Really；On the other hand, because the temperature of reaction system under microwave environment can significantly be lifted within the extremely short time, if now
H2O2Excessive concentration, releases substantial amounts of heat and oxygen again while reaction, it may appear that the phenomenon of bumping, there is serious peace
Full hidden danger, while clearance can also be reduced；And suitable native liquor ratio, not only reduce the processing cost of later stage waste liquid, moreover it is possible to reach
To maximized economic benefit.But if native liquid is smaller, oxidant is excessive, under microwave irradiation, the easy bumping of reaction system,
And H2O2Decompose violent, it is dangerous larger；Each parameter selection and optimization are highly important as can be seen here.
It is preferred that, in the step (2), eluent is H3PO4, DTPA, HCl, disodium ethylene diamine tetraacetate (EDTA), enter
One step is preferably EDTA；
It is preferred that, step (2) the elution specific method is：Added 0.1~0.5M EDTA as leacheate through step
(1) in the soil sample after handling, the mass volume ratio of the soil sample and EDTA solution is 1:5~15 (g：Ml), more preferably
1:10；Isothermal vibration 2h, rotating speed 150rmin at room temperature-1；Leacheate is filtered out after centrifugation；
It is further preferred that in the step (2), EDTA solution concentrations are 0.1M, contain pollution of chromium through what step (1) was handled
The pH of soil sample EDTA solution is 4~6.
It is further preferred that a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place, including following step
Suddenly：
(1) pre-process：Ground 2mm sieves after chromium-polluted soil is air-dried will be contained, it is standby；
(2) by mass concentration for 7% hydrogen peroxide with through pre- step (1) it is pretreated containing chromium soil mix, containing chromium soil
The mass volume ratio of earth and hydrogen peroxide is 1:4(g：ml)；Hydrogen peroxide solution pH containing chromium-polluted soil is 7；Microwave power is
800W, microwave irradiation processing time is 10min；It is then centrifuged for or filters removal treatment fluid；Water is added into the soil sample after processing,
It is 1 to add water to native liquid mass volume ratio:3(g：Ml), reciprocal concussion or stirring 20~30 minutes；Filter or be centrifuged off washing
Liquid；
(3) 0.1M EDTA are added in the soil sample after being handled through step (2) as leacheate, the soil sample and EDTA are molten
The mass volume ratio of liquid is 1:10(g：ml)；The pH of the EDTA solution of soil sample containing pollution of chromium is 4；Isothermal vibration 2h, turns at room temperature
Fast 150rmin-1；Leacheate is filtered out after centrifugation.
The invention also discloses application of the above method in pollution of chromium place is repaired.
Beneficial effects of the present invention：
The present invention strengthens chemical oxidation using physical method, not only reduces oxidizer, improves oxidation efficiency, and thing
After reason excitaton source is removed, any residuals will not be left in soil, specifically, pollution of chromium place proposed by the present invention is micro-
Ripple oxidation-elution combined remediation method, can effectively facilitate conversion of the trivalent chromium to Cr VI, so as to improve pollution of chromium
Ground remediation efficiency is, it is necessary to which explanation, because the occurrence patterns that Soil texture is different, chromium is in soil are different, chromium is in soil
It is cinnamon soil, pH meta-alkalescences (9.36- that total content difference in earth, which can influence to be directed to soil types in remediation efficiency, the present invention,
9.47), content of 6-valence Cr ions accounts for the relatively low chromium heavily contaminated place (total chrome content of chromium activity index of total chrome content 6~9%
6665.87~9703.33mgkg-1), handle to elute through EDTA again through microwave reinforced hydrogen peroxide oxidation and repair, it is excellent by adjusting
Change each scale parameter, final chromium clearance is up to 89.77% (embodiment 1), achieves good technique effect.
The present invention uses microwave reinforced hydrogen peroxide oxidation process, by applying microwave irradiation so that the mass transfer velocity of system
Accelerate, so that the collision of the collision and trivalent chromium and oxidant in contaminated soil oxidation system between soil particle increases, from
And conversion of the trivalent chromium to Cr VI is promoted, improve total chromium clearance；Meanwhile, in microwave reinforced oxidizing process, invention
People has been surprisingly found that pH influences very big to oxidizing process, and one side pH can influence the structure of soil particle so that in specific pH
Under the conditions of, the trivalent chromium in soil particle is easier to be stripped out, promotes conversion；Another aspect pH can effectively improve H2O2
Oxidisability, so as to further improve transformation efficiency.
EDTA is due to stronger complexing power, it has also become current maximally effective complex extractions agent, as a kind of
Follow-up to be eluted using EDTA, maximization removes active chromium, meanwhile, inventor is made by controlling the concentration and pH of EDTA solution
Ferriferous oxide after must eluting in soil reduces the activity of pedo relict chromium, forces heavy metal further to be stablized in soil,
So as to effectively reduce the chromium toxicity remained in soil, so that of the invention realize removes and the dirt of curing/stabilizing chromium simultaneously
The double effectses of dye.
Brief description of the drawings
Fig. 1 is influence of the different oxidant concentrations to Cr full dose clearances；The involved Cr contaminated soils of research come from certain
Ground is left after the resettlement of chemical plant, abscissa represents sampling position respectively；
Fig. 2 is different native liquor ratio (soil qualities/g：Oxidant H2O2Volume/ml) the different influences to Cr full dose clearances；
Fig. 3 is influence of the different microwave to Cr full dose clearances；
Fig. 4 is influence of the different microwave times to Cr full dose clearances；
Fig. 5 is influences of the different pH (microwave reinforced oxidation stage) to Cr full dose clearances.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
Be also intended to include plural form, additionally, it should be understood that, when in this manual use term "comprising" or " comprising "
When, it indicates existing characteristics, step, operation, device, component or combinations thereof.
As background technology is introduced, the technology administered both at home and abroad for chromium-polluted soil mainly have chemical reduction method,
Solidification/stabilization method, electro reclamation, bioanalysis, chemical leaching method etc., various methods have its scope of application and limitation, and fresh
Effectively administer the report of chromium serious pollution length.
In view of this, in an exemplary embodiment of the invention there is provided a kind of microwave reinforced oxidation in pollution of chromium place-
Combined remediation method is eluted, including：
(1) hydrogen peroxide is carried out microwave treatment, treatment fluid is then removed, by the soil sample after processing with being mixed containing chromium soil
Add water washing, and removes cleaning solution；
(2) soil after step (1) processing is added into leacheate to be eluted.
In the another exemplary embodiment of the present invention, to carrying out hydrogen peroxide oxidation before processing containing chromium soil, soil is entered
Row is pre-processed, and specific method is：Ground 1-2mm sieves after chromium-polluted soil is air-dried will be contained；
In the another exemplary embodiment of the present invention, step (1) specific method is：By hydrogen peroxide and after pretreatment
Containing chromium soil mix, the mass volume ratio containing chromium soil and hydrogen peroxide be 1:1~5 (g：Ml (it is preferably) 1:4)；Containing pollution of chromium
The hydrogen peroxide solution pH of soil is 6~11；Microwave power is 200~800W, and microwave irradiation processing time is 8-12min；Then
Centrifugation or filtering remove treatment fluid；Water is added into the soil sample after processing, washing is filtered or is centrifuged off in reciprocal concussion or stirring
Liquid；
In the another exemplary embodiment of the present invention, the hydrogen peroxide concentration is 7%, and adding water to native liquid mass volume ratio is
1:2~3 (g：Ml), reciprocal concussion or stirring 20~30 minutes；
In the another exemplary embodiment of the present invention, in the step (2), eluent is H3PO4, DTPA, HCl, ethylenediamine
Tetraacethyl disodium (EDTA), more preferably EDTA；
In the another exemplary embodiment of the present invention, step (2) the elution specific method is：By 0.1~0.5M EDTA
Added as leacheate in the soil sample after being handled through step (1), the mass volume ratio of the soil sample and EDTA solution is 1:5~15
(g：Ml), more preferably 1:10；Isothermal vibration 2h, rotating speed 150rmin at room temperature-1；Leacheate is filtered out after centrifugation；
In the another exemplary embodiment of the present invention, in the step (2), EDTA solution concentrations are 0.1M, through step (1)
The pH of the EDTA solution of soil sample containing pollution of chromium of processing is 4~6.
In the another exemplary embodiment of the present invention, a kind of microwave reinforced oxidation-elution joint in pollution of chromium place is repaired
Method, comprises the following steps：
(1) pre-process：Ground 2mm sieves after chromium-polluted soil is air-dried will be contained, it is standby；
(2) by mass concentration for 7% hydrogen peroxide with through pre- step (1) it is pretreated containing chromium soil mix, containing chromium soil
The mass volume ratio of earth and hydrogen peroxide is 1:4(g：ml)；Hydrogen peroxide solution pH containing chromium-polluted soil is 7；Microwave power is
800W, microwave irradiation processing time is 10min；It is then centrifuged for or filters removal treatment fluid；Water is added into the soil sample after processing,
It is 1 to add water to native liquid mass volume ratio:3(g：Ml), reciprocal concussion or stirring 20~30 minutes；Filter or be centrifuged off washing
Liquid；
(3) 0.1M EDTA are added in the soil sample after being handled through step (2) as leacheate, the soil sample and EDTA are molten
The mass volume ratio of liquid is 1:10(g：ml)；The pH of the EDTA solution of soil sample containing pollution of chromium is 4；Isothermal vibration 2h, turns at room temperature
Fast 150rmin-1；Leacheate is filtered out after centrifugation.
In the another exemplary embodiment of the present invention, a kind of above method answering in pollution of chromium place is repaired is additionally provided
With.
With reference to specific embodiment, present invention is described, is not limited only to this example.
Embodiment 1
(1) pre-process：Ground 2mm sieves after chromium-polluted soil is air-dried will be contained, it is standby；
(2) by mass concentration for 7% hydrogen peroxide with through pre- step (1) it is pretreated containing chromium soil mix, containing chromium soil
The mass volume ratio of earth and hydrogen peroxide is 1:4(g：ml)；Hydrogen peroxide solution pH containing chromium-polluted soil is 7；Microwave power is
800W, microwave irradiation processing time is 10min；It is then centrifuged for or filters removal treatment fluid；Water is added into the soil sample after processing,
It is 1 to add water to native liquid mass volume ratio:3(g：Ml), reciprocal concussion or stirring 20~30 minutes；Filter or be centrifuged off washing
Liquid；
(3) 0.1M EDTA are added in the soil sample after being handled through step (2) as leacheate, the soil sample and EDTA are molten
The mass volume ratio of liquid is 1:10(g：ml)；The pH of the EDTA solution of soil sample containing pollution of chromium is 4；Isothermal vibration 2h, turns at room temperature
Fast 150rmin-1；Leacheate is filtered out after centrifugation.
Embodiment 2
(1) pre-process：Ground 2mm sieves after chromium-polluted soil is air-dried will be contained, it is standby；
(2) by mass concentration for 7% hydrogen peroxide with through pre- step (1) it is pretreated containing chromium soil mix, containing chromium soil
The mass volume ratio of earth and hydrogen peroxide is 1:4(g：ml)；Hydrogen peroxide solution pH containing chromium-polluted soil is 8；Microwave power is
600W, microwave irradiation processing time is 10min；It is then centrifuged for or filters removal treatment fluid；Water is added into the soil sample after processing,
It is 1 to add water to native liquid mass volume ratio:3(g：Ml), reciprocal concussion or stirring 20~30 minutes；Filter or be centrifuged off washing
Liquid；
(3) 0.5M EDTA are added in the soil sample after being handled through step (2) as leacheate, the soil sample and EDTA are molten
The mass volume ratio of liquid is 1:10(g：ml)；The pH of the EDTA solution of soil sample containing pollution of chromium is 5；Isothermal vibration 2h, turns at room temperature
Fast 150rmin-1；Leacheate is filtered out after centrifugation.
Embodiment 3
(1) pre-process：Ground 2mm sieves after chromium-polluted soil is air-dried will be contained, it is standby；
(2) by mass concentration for 7% hydrogen peroxide with through pre- step (1) it is pretreated containing chromium soil mix, containing chromium soil
The mass volume ratio of earth and hydrogen peroxide is 1:2(g：ml)；Hydrogen peroxide solution pH containing chromium-polluted soil is 10；Microwave power is
700W, microwave irradiation processing time is 10min；It is then centrifuged for or filters removal treatment fluid；Water is added into the soil sample after processing,
It is 1 to add water to native liquid mass volume ratio:4(g：Ml), reciprocal concussion or stirring 20~30 minutes；Filter or be centrifuged off washing
Liquid；
(3) 0.4M EDTA are added in the soil sample after being handled through step (2) as leacheate, the soil sample and EDTA are molten
The mass volume ratio of liquid is 1:10(g：ml)；The pH of the EDTA solution of soil sample containing pollution of chromium is 4；Isothermal vibration 2h, turns at room temperature
Fast 150rmin-1；Leacheate is filtered out after centrifugation.
Comparative example 1
Method be the same as Example 1, difference is that EDTA concentration is 1.0M, and the pH of the EDTA solution of soil sample containing pollution of chromium is 8.
Experiment proves that, comparative example 1 only increases by 3.2% compared with the chromium clearance of embodiment 1, but using TCLP (Toxicity
Characteristic Leaching Procedure) method to after processing soil carry out chromium toxicity characteristic leaching procedure, as a result show
The chromium toxicity level of comparative example 1 is compared with embodiment 1 high 23.5%.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place, it is characterised in that including：
(1) hydrogen peroxide is carried out microwave treatment, then removes treatment fluid, the soil sample after processing is added water with being mixed containing chromium soil
Washing, and remove cleaning solution；
(2) soil after step (1) processing is added into leacheate to be eluted.
2. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 1, its feature exists
In to containing chromium soil progress hydrogen peroxide oxidation before processing, being pre-processed to soil, specific method is：Pollution of chromium soil will be contained
Earth ground 1-2mm sieves after air-drying.
3. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 1, its feature exists
In step (1) specific method is：Hydrogen peroxide is mixed with after pretreatment containing chromium soil, containing chromium soil and hydrogen peroxide
Mass volume ratio be 1:1~5 (g：Ml (it is preferably) 1:4)；Hydrogen peroxide solution pH containing chromium-polluted soil is 6~11；Microwave
Power is 200~800W, and microwave irradiation processing time is 8-12min；It is then centrifuged for or filters removal treatment fluid；To after processing
Water is added in soil sample, cleaning solution is filtered or is centrifuged off in reciprocal concussion or stirring.
4. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 1, its feature exists
In the hydrogen peroxide concentration is 7%, and it is 1 to add water to native liquid mass volume ratio:2~3 (g：Ml), reciprocal concussion or stirring 20~
30 minutes.
5. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 1, its feature exists
In in the step (2), eluent is H3PO4, DTPA, HCl, disodium ethylene diamine tetraacetate (EDTA).
6. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 5, its feature exists
In the eluent is EDTA.
7. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 1, its feature exists
In step (2) the elution specific method is：0.1~0.5M EDTA are added as leacheate after being handled through step (1)
In soil sample, the mass volume ratio of the soil sample and EDTA solution is 1:5~15 (g：Ml), more preferably 1:10；In room temperature
Lower isothermal vibration 2h, rotating speed 150rmin-1；Leacheate is filtered out after centrifugation.
8. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 7, its feature exists
In in the step (2), EDTA solution concentrations are 0.1M, and the pH of the EDTA solution of soil sample containing pollution of chromium handled through step (1) is
4~6.
9. a kind of microwave reinforced oxidation-elution combined remediation method in pollution of chromium place as claimed in claim 1, its feature exists
In comprising the following steps：
(1) pre-process：Ground 2mm sieves after chromium-polluted soil is air-dried will be contained, it is standby；
(2) by mass concentration for 7% hydrogen peroxide with through pre- step (1) it is pretreated containing chromium soil mix, containing chromium soil with
The mass volume ratio of hydrogen peroxide is 1:4(g：ml)；Hydrogen peroxide solution pH containing chromium-polluted soil is 7；Microwave power is 800W, micro-
Amplitude is 10min according to processing time；It is then centrifuged for or filters removal treatment fluid；Water is added into the soil sample after processing, is added water to
Native liquid mass volume ratio is 1:3(g：Ml), reciprocal concussion or stirring 20~30 minutes；Filter or be centrifuged off cleaning solution；
(3) 0.1M EDTA are added in the soil sample after being handled through step (2) as leacheate, the soil sample and EDTA solution
Mass volume ratio is 1:10(g：ml)；The pH of the EDTA solution of soil sample containing pollution of chromium is 4；Isothermal vibration 2h, rotating speed at room temperature
150r·min-1；Leacheate is filtered out after centrifugation.
10. application of any one of the claim 1-9 methods described in pollution of chromium place is repaired.
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| CN109433811A (en) * | 2018-11-28 | 2019-03-08 | 中国科学院地理科学与资源研究所 | Contaminated soil remediation device |
| CN110918631A (en) * | 2019-11-19 | 2020-03-27 | 西北农林科技大学 | Chemical oxidation soil remediation method under microwave reinforcement |
| CN114643273A (en) * | 2022-03-24 | 2022-06-21 | 宁波财经学院 | Continuous repairing device for shallow contaminated soil |
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| CN110918631A (en) * | 2019-11-19 | 2020-03-27 | 西北农林科技大学 | Chemical oxidation soil remediation method under microwave reinforcement |
| CN114643273A (en) * | 2022-03-24 | 2022-06-21 | 宁波财经学院 | Continuous repairing device for shallow contaminated soil |
| CN114643273B (en) * | 2022-03-24 | 2023-03-14 | 宁波财经学院 | Continuous repairing device for shallow contaminated soil |
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