CN108213069A - Acid heavy metal contaminated soil remediation method - Google Patents
Acid heavy metal contaminated soil remediation method Download PDFInfo
- Publication number
- CN108213069A CN108213069A CN201810009233.6A CN201810009233A CN108213069A CN 108213069 A CN108213069 A CN 108213069A CN 201810009233 A CN201810009233 A CN 201810009233A CN 108213069 A CN108213069 A CN 108213069A
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- soil
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- metal contaminated
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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
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mycology (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Biomedical Technology (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Botany (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention discloses a kind of restorative procedure of acid heavy metal contaminated soil.Include the following steps：Determine that soil pH and content of beary metal to determine soil contamination grade, if soil contamination grade is severe, first carry out soil elution processing, then processing is passivated to soil；If soil contamination grade be in/it is slight, processing is directly passivated to soil.The restorative procedure of acid heavy metal contaminated soil of the present invention determines whether to carry out elution processing to soil, prevents from excessively eluting the problem of soil nutrient loss is caused excessively to be acidified with soil by determining soil contamination grade.For the present invention when being repaired to severe acid heavy metal contaminated soil, chemical leaching/bioleaching can remove the stronger heavy metal of mobility in soil, such as water-soluble state, carbonate combine state；Under electric field action, heavy metal can be by accelerating soil of migrating out the effects that electroosmotic flow, electromigration；The present invention realizes changing waste into resources utilization, has good result to soil remediation.
Description
Technical field
The present invention relates to a kind of acid heavy metal contaminated soil remediation methods.
Background technology
Soil acidification and heavy metal pollution problem have become the major issue for restricting China's sustainable development, especially in China
South, acid rain depositions, which constantly aggravate, ammonium fertilizer largely uses etc. causes soil acidification to aggravate, chemical industry, plating, electronics and process hides
Deng " three wastes " discharge that industry generates, smelting is adopted in mine, and the discharge of domestic waste, sewage irrigation and agricultural sludge etc. make
It obtains the heavy metal elements such as arsenic, cadmium, chromium, copper, iron, mercury, manganese, nickel, lead and the zinc in soil largely to dissolve out, calcium, magnesium, phosphorus in soil
The a large amount of leaching losses of nutrients are waited, acid soil heavy metallic poison, which becomes, to be inhibited plant growth and lead to crop failure and endanger people
The main reason for class is healthy, it is therefore desirable to handle acid heavy metal contaminated soil.
Invention content
In view of the above-mentioned problems, the present invention provides a kind of convenient acid heavy metal contaminated soil remediation method.
In order to achieve the above objectives, one kind of the present invention includes the following steps：Soil pH and content of beary metal are determined, if soil pH
＜ 5 and content of beary metal are more than the standard value of GB 15618-1995 grade III Standards, then elution processing, then soil are first carried out to soil
Earth is passivated processing；Otherwise, processing is directly passivated to soil.
Further, the specific method of the elution processing is：The addition elution medicament into soil, then by electrical conductor
It is contacted with soil, makes heavy metal that can migrate out by the effect of electroosmotic flow, electromigration soil.
Further, after soil is mixed with repair materials according to predetermined ratio, soil is conserved.
Further, it is described elution medicament include chemical leaching liquid, the chemical leaching liquid include hydrochloric acid, nitric acid,
The inorganic acids such as sulfuric acid, citric acid, acetic acid, organic acid, EDTA or IDDS.
Further, the elution medicament includes biology elution liquid, and the biology elution liquid is included with sulfur oxide sulphur
Bacillus, Thiobacillus ferrooxidans or the sour fungi of production.
Further, the repair materials include slag, charcoal, flyash, bentonite and composite fertilizer；
Wherein, each component is respectively by weight percentage：Slag 20-40%, charcoal 10-20%, flyash 5-10%,
Bentonite 10-20%, composite fertilizer 5-10%.
Further, the preparation method of the repair materials is by slag, charcoal, hardened fly ashes, bentonite and composite fertilizer
Processing is dried respectively makes its water content be less than 1%；Dried slag, charcoal, bentonite and composite fertilizer are distinguished again
Crushing processing makes its grain size be less than 2mm；Slag, charcoal, hardened fly ashes, bentonite and composite fertilizer after crushing is mixed,
And 180-210s is stirred with the rate of 80-100rpm.
Further, during the Passivation Treatment, the 5-10% that soil weight is accounted for using weight of repair materials；To soil into
During row maintenance, the 60% of field capacity, curing time is 15-30 days for the moisture of soil.
The restorative procedure of acid heavy metal contaminated soil of the present invention is determined whether by determining soil contamination grade to soil
Earth carries out elution processing, prevents from excessively eluting the problem of soil nutrient loss is caused excessively to be acidified with soil.The present invention is in counterweight
When degree acid heavy metal contaminated soil is repaired, chemical leaching/bioleaching can remove the stronger huge sum of money of mobility in soil
Belong to, such as water-soluble state, carbonate combine state；Under electric field action, heavy metal can be by accelerating to migrate the effects that electroosmotic flow, electromigration
Go out soil；Slag, charcoal available for adjusting pH, while can also fix a huge sum of money in alkalinity by the effects that absorption, surface precipitation
Belong to, and all realize changing waste into resources utilization, bentonite mainly fixes heavy metal by modes such as absorption, and commodity composite fertilizer is main
For supplementing soil nutrient.
Description of the drawings
Fig. 1 is schematic structural view of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings of the specification.
Embodiment 1
The present embodiment provides a kind of acid pollution soil remediation methods, include the following steps：Determine soil pH and heavy metal
Content if soil pH ＜ 5 and content of beary metal are more than the standard value of GB 15618-1995 grade III Standards, first carries out soil
Elution is handled, then processing is passivated to soil；Otherwise, processing is directly passivated to soil.
Specifically, the method for above-mentioned elution processing is：The addition elution medicament into soil, then by electrical conductor and soil
Contact makes heavy metal that can migrate out by the effect of electroosmotic flow, electromigration soil.
Specifically, above-mentioned Passivation Treatment includes, after soil is mixed with repair materials according to predetermined ratio, make repair materials
The 5-10% that soil weight is accounted for using weight, then soil is conserved, during maintenance, the moisture of soil is in field capacity
60%, curing time be 15-30 days.
Embodiment 2
As the concrete scheme of embodiment 1, above-mentioned elution medicament includes chemical leaching liquid, the chemical leaching liquid packet
Include the inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, citric acid, acetic acid, organic acid, EDTA or IDDS.
Alternatively, above-mentioned elution medicament include biology elution liquid, it is described biology elution liquid include with Thiobacillus thioxidans,
Thiobacillus ferrooxidans or the sour fungi of production.
Embodiment 3
As the concrete scheme of embodiment 1, repair materials include slag, charcoal, flyash, bentonite in the present embodiment
And composite fertilizer；
Wherein, each component is respectively by weight percentage：Slag 20-40%, charcoal 10-20%, flyash 5-10%,
Bentonite 10-20%, composite fertilizer 5-10%.
Specifically, the preparation method of above-mentioned repair materials is by slag, charcoal, hardened fly ashes, bentonite and composite fertilizer point
Processing is not dried makes its water content be less than 1%；Again to dried slag, charcoal, bentonite and composite fertilizer respectively into
Row pulverization process makes its grain size be less than 2mm；Slag, charcoal, hardened fly ashes, bentonite and composite fertilizer after crushing is mixed, and
180-210s is stirred with the rate of 80-100rpm.
The present invention is that the acidity based on severe acid heavy metal contaminated soil, nutrient are deficient, heavy metals exceeding standard shows
Real and generate, direct in-situ solidification and stabilization reparation is not only with high costs, and there are larger heavy metals to discharge risk again.
Chemical leaching/bioleaching can remove the stronger heavy metal of mobility in soil, such as water-soluble state, carbonate combine state
Deng；Under electric field action, heavy metal can be by accelerating soil of migrating out the effects that electroosmotic flow, electromigration；Slag, charcoal are in alkali
Property, available for adjusting pH, while can also heavy metal be fixed, and all realize waste resource by the effects that absorption, surface precipitation
Change and utilize, bentonite mainly fixes heavy metal by modes such as absorption, and commodity composite fertilizer is mainly used for supplementing soil nutrient.
Relative to the prior art, the invention has the advantages that and advantageous effect：
(1) first elution/bioleaching, rear solidification and stabilization strategy can effectively avoid severe acid heavy metal contaminated soil
Direct in-situ solidification and stabilization reparation discharges risk again；
(2) slag of the invention is solid waste, and charcoal comes from agricultural product stalk, of low cost, applied widely, real
Recycling is showed；
(3) solidification and stabilization medicament of the present invention can effectively improve soil pH, reduce the active shape of heavy metal in soil
While state, the content of effective calcium in soil is improved；
(4) method of the invention can efficiently reduce environmental pollution, while can be the environment of acid heavy metal contaminated soil
It administers and scientific basis is provided, there is important practical value and realistic meaning.
Embodiment 4：
Such as table 1, three soil synthesis sample (each plot earth boring augers are acquired in Anhui Province Pyrite Mine Area periphery farmland
3-5 0-20cm sample of acquisition mixes), pH and each heavy metal element, the acid heavy metal provided according to table 1 are dirty after testing
Soil criterion is contaminated, sample 1 and sample 2 are determined as light intermediate acidity's heavy-metal contaminated soil, though wherein Cu contains in sample 2
It is more than grade III Standard to measure, but pH ＞ 5；Sample 3, Cu contents are more than grade III Standard, and pH ＜ 5, therefore, sample 3 is determined as severe
Contaminated soil.So in-situ solidifying stabilization processes can be used in sample 1 and 2 place plot of sample, 3 place plot of sample uses
Solidification and stabilization is handled after first eluting.
1 Anhui Province Pyrite Mine Area periphery agricultural land soil sample physical and chemical index of table
3 place plot soil of sample is excavated, into chemical leaching device, eluent is dilute hydrochloric acid, is handled through elution, Cu
Content falls to 318mg/kg, and less than grade III Standard, further elution causes soil nutrient to be excessively lost in and soil in order to prevent
Acidification stops elution, into the processing of next step solidification and stabilization.
Soil after elution processing is up to standard through dry, pulverize, adds in 5% solidification and stabilization medicament, stirs evenly, protect
60% condition for holding field capacity conserves 20 days.
After testing, pH ＞ 5 and leach content of beary metal be decreased obviously (α=0.05), original plot can be backfilled to.
Embodiment 5：
Above-mentioned soil establishing criteria judgement, 3 place plot of sample are handled using solidification and stabilization after first bioleaching.
3 place plot soil of sample is excavated, into bioleaching device, sulphur powder and ferrous sulfate is applied, promotes original inhabitants
Growth of thiobacillus is handled through bioleaching, and Cu contents is fall to 326mg/kg, less than grade III Standard, in order to prevent further
Leaching causes soil nutrient to be excessively lost in and soil acidification, stops leaching, into the processing of next step solidification and stabilization.
Soil after elution processing is up to standard through dry, pulverize, adds in 5% solidification and stabilization medicament, stirs evenly, protect
60% condition for holding field capacity conserves 20 days.
After testing, pH ＞ 5 and leach content of beary metal be decreased obviously (α=0.05), original plot can be backfilled to.
Embodiment 6：
Above-mentioned soil establishing criteria judgement, 3 place plot of sample are handled using solidification and stabilization after first bioleaching.
3 place plot soil of sample is excavated, into bioleaching device, sulphur powder and ferrous sulfate is applied, promotes original inhabitants
Growth of thiobacillus, external direct current power supply, voltage control is in 110V, promotion heavy metal fast transferring.
Through bioleaching+electrokinetic process, soil Cu contents are in a short time less than grade III Standard, in order to prevent further leaching
Filter causes soil nutrient to be excessively lost in and soil acidification, stops leaching, into the processing of next step solidification and stabilization.
Soil after elution processing is up to standard through dry, pulverize, adds in 5% solidification and stabilization medicament, stirs evenly, protect
60% condition for holding field capacity conserves 20 days.
After testing, pH ＞ 5 and leach content of beary metal be decreased obviously (α=0.05), original plot can be backfilled to.
More than, only presently preferred embodiments of the present invention, but protection scope of the present invention is not limited thereto is any to be familiar with sheet
In the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in should all be covered those skilled in the art
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection domain that claim is defined.
Claims (9)
1. a kind of restorative procedure of acid heavy metal contaminated soil, which is characterized in that include the following steps：Determine soil pH and again
Tenor, if soil contamination grade is severe, first carries out elution processing, then to soil to determine soil contamination grade to soil
Earth is passivated processing；If soil contamination grade be in/it is slight, processing is directly passivated to soil.
2. the restorative procedure of acid heavy metal contaminated soil according to claim 1, which is characterized in that the elution processing
Specific method be：Into soil, addition elution medicament, then electrical conductor is contacted, make heavy metal that can pass through electric osmose with soil
Stream, electromigration effect migrate out soil.
3. contaminated soil remediation method according to claim 1, which is characterized in that the Passivation Treatment includes, by soil
After being mixed with repair materials according to predetermined ratio, soil is conserved.
4. the restorative procedure of acid heavy metal contaminated soil according to claim 2, which is characterized in that the elution medicament
Including chemical leaching liquid, the chemical leaching liquid includes inorganic acids such as hydrochloric acid, nitric acid, sulfuric acid, citric acid, acetic acid, organic
Acid, EDTA or IDDS.
5. the restorative procedure of acid heavy metal contaminated soil according to claim 2, which is characterized in that the elution medicament
Liquid is eluted including biology, the biology elution liquid is included with Thiobacillus thioxidans, Thiobacillus ferrooxidans or the sour fungi of production.
6. the restorative procedure of acid heavy metal contaminated soil according to claim 3, which is characterized in that the repair materials
Including slag, charcoal, flyash, bentonite and composite fertilizer；
Wherein, each component is respectively by weight percentage：Slag 20-40%, charcoal 10-20%, flyash 5-10%, swelling
Native 10-20%, composite fertilizer 5-10%.
7. the restorative procedure of acid heavy metal contaminated soil according to claim 3, which is characterized in that the repair materials
Preparation method be less than its water content for slag, charcoal, hardened fly ashes, bentonite and composite fertilizer are dried processing respectively
1%；Crushing processing respectively to dried slag, charcoal, bentonite and composite fertilizer again makes its grain size be less than 2mm；It will
Slag, charcoal, hardened fly ashes, bentonite and composite fertilizer's mixing after crushing, and 180- is stirred with the rate of 80-100rpm
210s。
8. the restorative procedure of acid heavy metal contaminated soil according to claim 3, which is characterized in that the Passivation Treatment
When, the 5-10% that soil weight is accounted for using weight of repair materials；When being conserved to soil, the moisture of soil is in field water holding
The 60% of amount, curing time are 15-30 days.
9. the restorative procedure of acid heavy metal contaminated soil according to claim 1, which is characterized in that soil contamination grade
Determination method be：Soil pH ＜ 5, and heavy metal in soil content is more than the standard value of GB15618-1995 grade III Standards, then
The soil be severe contaminated soil, otherwise in/slight pollution soil.
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|---|---|---|---|
| CN201810009233.6A CN108213069A (en) | 2018-01-04 | 2018-01-04 | Acid heavy metal contaminated soil remediation method |
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| CN201810009233.6A CN108213069A (en) | 2018-01-04 | 2018-01-04 | Acid heavy metal contaminated soil remediation method |
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ID=62643059
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| CN201810009233.6A Pending CN108213069A (en) | 2018-01-04 | 2018-01-04 | Acid heavy metal contaminated soil remediation method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109513736A (en) * | 2018-12-05 | 2019-03-26 | 上海万帝环境技术有限公司 | Contaminated soil remediation method and prosthetic device |
| CN109988579A (en) * | 2019-02-18 | 2019-07-09 | 太湖鑫芳源林业发展有限公司 | A kind of reparation medicament of heavy-metal contaminated soil |
| CN110452707A (en) * | 2019-08-26 | 2019-11-15 | 成都工业学院 | A kind of heavy metal pollution of soil renovation agent and its preparation method and application |
| CN110523762A (en) * | 2019-08-20 | 2019-12-03 | 北京上水环境科技发展有限公司 | A kind of administering method of alkaline land soil heavy metal pollution |
| CN110605297A (en) * | 2019-09-26 | 2019-12-24 | 江苏龙环环境科技有限公司 | Leaching remediation method for acid heavy metal contaminated soil |
| CN111822497A (en) * | 2020-07-30 | 2020-10-27 | 广东佳德环保科技有限公司 | Remediation device system and method for soil organic matter and heavy metal pollution |
| CN112080282A (en) * | 2020-10-12 | 2020-12-15 | 李建勋 | Acidic soil remediation agent and preparation method thereof |
| CN112210383A (en) * | 2020-10-14 | 2021-01-12 | 中交上海航道局有限公司 | Microbial/industrial solid waste modifier for acid soil modification and preparation method thereof |
| CN113976604A (en) * | 2021-10-29 | 2022-01-28 | 江苏和而同环境建设有限公司 | Method for treating acidic heavy metal polluted rice field |
| CN114032104A (en) * | 2021-12-06 | 2022-02-11 | 深圳市万创青绿环境工程有限公司 | Bioremediation liquid, preparation method thereof and method for remedying soil heavy metals |
| CN114733892A (en) * | 2022-03-01 | 2022-07-12 | 武汉市秀谷科技有限公司 | Farmland soil copper and nickel pollution treatment method |
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| CN109513736A (en) * | 2018-12-05 | 2019-03-26 | 上海万帝环境技术有限公司 | Contaminated soil remediation method and prosthetic device |
| CN109988579A (en) * | 2019-02-18 | 2019-07-09 | 太湖鑫芳源林业发展有限公司 | A kind of reparation medicament of heavy-metal contaminated soil |
| CN110523762A (en) * | 2019-08-20 | 2019-12-03 | 北京上水环境科技发展有限公司 | A kind of administering method of alkaline land soil heavy metal pollution |
| CN110452707A (en) * | 2019-08-26 | 2019-11-15 | 成都工业学院 | A kind of heavy metal pollution of soil renovation agent and its preparation method and application |
| CN110605297A (en) * | 2019-09-26 | 2019-12-24 | 江苏龙环环境科技有限公司 | Leaching remediation method for acid heavy metal contaminated soil |
| CN111822497A (en) * | 2020-07-30 | 2020-10-27 | 广东佳德环保科技有限公司 | Remediation device system and method for soil organic matter and heavy metal pollution |
| CN111822497B (en) * | 2020-07-30 | 2024-02-06 | 广东佳德环保科技有限公司 | Repairing device system and method for soil organic matter and heavy metal pollution |
| CN112080282A (en) * | 2020-10-12 | 2020-12-15 | 李建勋 | Acidic soil remediation agent and preparation method thereof |
| CN112210383A (en) * | 2020-10-14 | 2021-01-12 | 中交上海航道局有限公司 | Microbial/industrial solid waste modifier for acid soil modification and preparation method thereof |
| CN113976604A (en) * | 2021-10-29 | 2022-01-28 | 江苏和而同环境建设有限公司 | Method for treating acidic heavy metal polluted rice field |
| CN114032104A (en) * | 2021-12-06 | 2022-02-11 | 深圳市万创青绿环境工程有限公司 | Bioremediation liquid, preparation method thereof and method for remedying soil heavy metals |
| CN114733892A (en) * | 2022-03-01 | 2022-07-12 | 武汉市秀谷科技有限公司 | Farmland soil copper and nickel pollution treatment method |
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Application publication date: 20180629 |
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