CN109158414A - A kind of plant extract in heavy metal pollution farmland-chemical passivation combined remediation method - Google Patents
A kind of plant extract in heavy metal pollution farmland-chemical passivation combined remediation method Download PDFInfo
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- CN109158414A CN109158414A CN201810807336.7A CN201810807336A CN109158414A CN 109158414 A CN109158414 A CN 109158414A CN 201810807336 A CN201810807336 A CN 201810807336A CN 109158414 A CN109158414 A CN 109158414A
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- heavy metal
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- plant extract
- chemical passivation
- metal pollution
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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
- B09C1/10—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
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mycology (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Botany (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The present invention relates to a kind of plant extract in heavy metal pollution farmland-chemical passivation combined remediation methods, including the plant extract restorative procedure for slack season and for the chemical passivation restorative procedure of agro-farming, passivator is added in the soil in heavy metal pollution farmland in chemical passivation restorative procedure, passivator and Soil tillage are mixed, crops are planted again, plant extract restorative procedure plants landfill plant in the same a piece of farmland of crop harvesting, gathers in up to maturation or before next round crop planting.Plant extract restorative procedure of the present invention carries out in slack season, crop-planting is not influenced, chemical agent disposably adds, and effectively controls content of beary metal in crops, meet food quality purpose up to standard, period in annual slack season plant extract restorative procedure rehabilitating soil later, more environmentally protective than other chemical remediation modes, rehabilitation plant is to strong environmental adaptability, biomass is big, growth is fast and strong to heavy metal accumulation ability, at low cost, and method is simple, is easily managed.
Description
Technical field
The present invention relates to soil improvements and environmental protection technical field, in particular to a kind of efficient, economy heavy metal-polluted
Contaminate the plant extract-chemical passivation combined remediation method in farmland.
Background technique
Soil is the basis of all rural activities, and pollution level directly affects the development of agricultural and the quality peace of agricultural product
Entirely.
With the development of the city with the continuous propulsion of process of industrialization, the quick of a large amount of industrial enterprises, extensive development with
And a large amount of uses of chemical fertilizer and pesticide, so that farmland soil heavy metals pollution becoming serious, this has seriously affected crops
Yield and quality, the final health for influencing people.
According to statistics, 266.7 ten thousand hm of Chinese industrial three-waste pollution cultivated area in 19802, increase to 666.7 ten thousand within 1988
hm2, increase to 10,000,000 hm within 19922, the national cultivated area polluted in various degree has been approached 20,000,000 hm at present2, about
Account for the 1/5 of cultivated area.China is more than every year 10000000 tons because of grain drop in production caused by heavy metal pollution, contaminated by heavy metals
Up to 12,000,000 tons of grain, add up at least 20,000,000,000 yuan of economic loss.And simultaneously, the plurality of heavy metal danger that China occurs in recent years
Evil event is also required to draw attention, such as Guangdong Renhua and Anhui Huaining children blood lead is exceeded, Hunan rice cadmium is exceeded and Zhe Jiangcheng
Suburb heavy metals in farmland pollution etc..
In the prior art, heavy metal-polluted soil is repaired mainly based on passivating method.Chinese patent CN102174325A is disclosed
A kind of is the farmland soil heavy metals passivator of raw material, Chinese patent using plant slag, sepiolite powder and quick lime
CN103936530A disclose it is a kind of using calcium magnesium phosphate, charcoal base manure and lime stone as the cadmium pollution soil passivator of raw material, it is above-mentioned
Method based on chemical passivation can not remove the heavy metal in soil, and only reduce its validity, may cause
The problems such as secondary pollution or influence soil quality is a kind of palliative restorative procedure.
It is chemical oxidizing agent, Microwave method for physics side that Chinese patent CN103639182A, which discloses one kind using Fenton reagent,
The method that method and ciliate desert-grass joint repair the organic material contaminated soil containing arsenic, Chinese patent CN104668281A disclose one kind to change
The method for learning elution method and S.plumbizincicola combined repair of cadmium polluted acid soil, above-mentioned patent are repaired using phytoremediation with other
The united means of compound method carry out restoration of soil polluted by heavy metal, and repair time is longer, influence the utilization and exploitation of soil.
Chinese patent CN102240670A discloses a kind of method using Spherical red antibacterial restoration of soil polluted by heavy metal,
Chinese patent CN103418608A is disclosed a kind of eluted using sulfate reducing bacteria joint surfactant and repairs a mining area huge sum of money
Belong to the method for contaminated soil, Chinese patent CN102580999A discloses a kind of utilization bacillus subtilis and colloid bacillus cereus
Production microbial bacterial agent prevents the technology of heavy metal pollution of soil rice, above-mentioned patented technology using microorganism and other methods into
Row joint is repaired, although microorganism remediation has fewer environmental impacts, repair time is generally longer.
In general, the existing restorative procedure for heavy metal pollution of soil, the defect being primarily present include:
(1) restorative procedure based on chemical passivation does not remove the heavy metal in soil, over time, passivation
Heavy metal afterwards is possible to be activated again, so that there are potential risks.And continually apply chemical inactivators, it may shadow
Soil texture and physicochemical property are rung, and influences crop and yield；
(2) method based on microorganism remediation or phytoremediation, repairing efficiency is longer, will affect land use.
Current heavy metal-polluted soil restorative procedure there are aiming at the problem that, propose a kind of repair mode being more simple and efficient,
To instructing actual production to be of great importance.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provides a kind of plant in the heavy metal pollution farmland of optimization
Extraction-chemical passivation combined remediation method.
It is repaired the technical scheme adopted by the invention is that a kind of plant extract-chemical passivation in heavy metal pollution farmland is combined
Compound method, plant extract restorative procedure when the combined remediation method includes for slack season and chemical passivation when for agro-farming
Restorative procedure；Under normal circumstances, by taking Yangtze River Delta rice cultivation as an example, slack season is generally March November to next year, and agro-farming is general
For April to October.
The chemical passivation restorative procedure is that passivator is added in the soil in heavy metal pollution farmland, will using rotary cultivator
Passivator and Soil tillage mix, and then plant crops again；
The plant extract restorative procedure is to plant after crop harvesting with plantation landfill in a piece of farmland
Object is gathered in up to landfill plant maturation or before next round crop planting.
Preferably, the passivator is red mud and CaH2PO4, wherein CaH2PO4As calcium dihydrogen phosphate
Preferably, the additive amount of the red mud is by the 1%-3% of plowed soils quality, CaH2PO4Additive amount be turned over
Plough the 0.1%-0.3% of soil quality.
Preferably, the ploughed depth of the soil is 20cm.
Preferably, the landfill plant includes spot thatch and ciliate desert-grass.During actual job, landfill
Plant includes but is not limited to spot thatch and ciliate desert-grass, further includes other landfill plants.
Preferably, the seeding method of the landfill plant is to broadcast sowing, and the stand density of landfill plant is
1-2 ten thousand per acre.
Preferably, the stand density of the landfill plant is 1.2-1.5 ten thousand per acre.
In the present invention, red mud is combination method aluminium metallurgy residue, pH value 12.3, CaO content 325g/kg, SiO2Content 198g/
Kg, Fe2O3Content 87g/kg, Al2O3The combination method aluminium metallurgy residue or red mud of content 34g/kg, i.e., every kg, mainly pass through physics
Absorption improves chemistry suction of the soil pH value increase soil colloid to iron-aluminium oxide in the absorption of heavy metal and red mud to heavy metal
It is attached to reduce heavy metal validity, and reduce plant absorption.
In the present invention, calcium dihydrogen phosphate is inorganic compound, mainly passes through the modes stable soil heavy metal such as chemical precipitation.
In the present invention, landfill plant is the plant for referring to excess and absorbing and accumulating heavy metal, and plant is intracorporal
Content of beary metal can reach 100 times of general plant or more.
In the present invention, spot thatch, ciliate desert-grass or other landfill plants are planted when farmland is lain fallow, and pass through counterweight
Reduction heavy metal content in soil is played in the absorption of metal, is finally reached the purpose of rehabilitating soil.
The present invention provides a kind of plant extract in the heavy metal pollution farmland of optimization-chemical passivation combined remediation method,
Compared with the prior art, the advantages of the present invention are as follows:
(1) it in the present invention, is mainly carried out at slack seasons for the plant extract restorative procedure of heavy metal repair process, not shadow
Ring crop-planting；
(2) chemical agent is added to disposable process, and content of beary metal in crops can be effectively controlled, meet food quality
Purpose up to standard, period in annual slack season plant extract restorative procedure rehabilitating soil, greener than other chemical remediation modes later
Color, environmental protection；
(3) rehabilitation plant used in the present invention, to strong environmental adaptability, biomass is big, and growth is very fast and to heavy metal
Accumulation ability is strong；
(4) cost is relatively low required for the present invention, and method is simple, is easily managed, therefore is suitble to low heavy in large area
It promotes in metallic pollution farmland.
Specific embodiment
The present invention is described in further detail below with reference to embodiment, it should be noted that the present invention is not limited to
Lower embodiment, acceptable there are many deformations.Those skilled in the art can directly be exported from present disclosure or
All deformations associated, are considered as protection scope of the present invention.
Test plot is Linan City of Zhejiang Province heavy metal pollution farmland, and measuring its soil pH value is 5.93, belongs to acidity
Soil, heavy metal in soil Cu, Zn, Pb and Cd, content be respectively 80.6mg/kg, 21.7mg/kg, 180.3mg/kg and
1.2mg/kg.According to national standard of soil environment quality (GB15618-1995) when soil pH < 6.5, standard value (mg/
It kg) is Cu≤50, Zn≤200, Pb≤250, Cd≤0.3.It follows that plot Cu and Cd concentration are more than secondary standard.
Embodiment 1
Using the plant extract-chemical passivation combined remediation method in above-mentioned heavy metal pollution farmland, in heavy metal polluted soil
Chemical inactivators are added in earth, specially apply 1% red mud of institute's plowed soils quality, 0.1% CaH2PO4, turn over mixing
Normal rice cultivation afterwards plants spot thatch after rice harves.
It is 0.10mg/kg that cadmium content in rice is measured after rice harves, lower than contaminants in foods (GB in state food
The spot thatch plant content of beary metal of the limit value of 0.2mg/kg in 2762-2012), harvesting is shown in Table 1.
The spot thatch plant content of beary metal of 1 embodiment 1 of table harvesting
Embodiment 2
Using the plant extract-chemical passivation combined remediation method in above-mentioned heavy metal pollution farmland, in heavy metal polluted soil
Chemical inactivators are added in earth, specially apply 2% red mud of soil quality, 0.2% CaH2PO4, turn over normal after mixing
Rice cultivation plants spot thatch after rice harves.
It is 0.07mg/kg that cadmium content in rice is measured after rice harves, lower than contaminants in foods (GB in state food
The plants enriched content of beary metal of spot thatch of the limit value of 0.2mg/kg in 2762-2012), harvesting is shown in Table 2.
The spot thatch plant content of beary metal of 2 embodiment 2 of table harvesting
Embodiment 3
Using the plant extract-chemical passivation combined remediation method in above-mentioned heavy metal pollution farmland, in heavy metal polluted soil
Chemical inactivators are added in earth, specially apply 3% red mud of soil quality, 0.3% CaH2PO4, turn over normal after mixing
Rice cultivation plants spot thatch after rice harves.
It is 0.05mg/kg that cadmium content in rice is measured after rice harves, lower than contaminants in foods (GB in state food
The plants enriched content of beary metal of spot thatch of the limit value of 0.2mg/kg in 2762-2012), harvesting is shown in Table 3.
The spot thatch plant content of beary metal of 3 embodiment 3 of table harvesting
Comparative example
The present embodiment normal rice cultivation in the soil of heavy metal pollution.
It is 0.39mg/kg that Cd concentration of brown rice is measured after rice harves, is higher than contaminants in foods (GB in state food
The limit value of 0.2mg/kg in 2762-2012).
Claims (7)
1. a kind of plant extract in heavy metal pollution farmland-chemical passivation combined remediation method, it is characterised in that: it is described combine repair
Plant extract restorative procedure when compound method includes for slack season and chemical passivation restorative procedure when for agro-farming；
The chemical passivation restorative procedure is that passivator is added in the soil in heavy metal pollution farmland, will be passivated using rotary cultivator
Agent and Soil tillage mix, and then plant crops again；
The plant extract restorative procedure be after crop harvesting, in a piece of farmland plant landfill plant, directly
It is gathered in landfill plant maturation or before next round crop planting.
2. a kind of plant extract-chemical passivation combined remediation method in heavy metal pollution farmland according to claim 1,
Be characterized in that: the passivator is red mud and CaH2PO4。
3. a kind of plant extract-chemical passivation combined remediation method in heavy metal pollution farmland according to claim 2,
Be characterized in that: the additive amount of the red mud is by the 1%-3% of plowed soils quality, CaH2PO4Additive amount be by plowed soils matter
The 0.1%-0.3% of amount.
4. a kind of plant extract-chemical passivation combined remediation method in heavy metal pollution farmland according to claim 1,
Be characterized in that: the ploughed depth of the soil is 20 cm.
5. a kind of plant extract-chemical passivation combined remediation method in heavy metal pollution farmland according to claim 1,
Be characterized in that: the landfill plant includes spot thatch and ciliate desert-grass.
6. a kind of plant extract-chemical passivation combined remediation method in heavy metal pollution farmland according to claim 1,
Be characterized in that: the seeding method of the landfill plant is to broadcast sowing, and the stand density of landfill plant is 1-2 per acre
Ten thousand.
7. a kind of plant extract-chemical passivation combined remediation method in heavy metal pollution farmland according to claim 6,
Be characterized in that: the stand density of the landfill plant is 1.2-1.5 ten thousand per acre.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810807336.7A CN109158414A (en) | 2018-07-21 | 2018-07-21 | A kind of plant extract in heavy metal pollution farmland-chemical passivation combined remediation method |
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| CN201810807336.7A CN109158414A (en) | 2018-07-21 | 2018-07-21 | A kind of plant extract in heavy metal pollution farmland-chemical passivation combined remediation method |
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Cited By (4)
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| CN110918638A (en) * | 2020-01-17 | 2020-03-27 | 湖南超富集生态科技有限公司 | Method for activating and repairing arsenic-polluted soil by using ciliate desert-grass |
| CN111992580A (en) * | 2020-07-11 | 2020-11-27 | 中节能大地环境修复有限公司 | Remediation method for heavy metal polluted farmland |
| CN113000598A (en) * | 2020-10-29 | 2021-06-22 | 湖南艾布鲁环保科技股份有限公司 | Agricultural non-point source and heavy metal pollution agricultural land comprehensive treatment and ecological restoration method |
| CN113732051A (en) * | 2021-09-15 | 2021-12-03 | 河南省科学院高新技术研究中心 | Method for restoring farmland polluted by heavy metals |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110918638A (en) * | 2020-01-17 | 2020-03-27 | 湖南超富集生态科技有限公司 | Method for activating and repairing arsenic-polluted soil by using ciliate desert-grass |
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| CN113732051B (en) * | 2021-09-15 | 2022-08-02 | 河南省科学院高新技术研究中心 | Method for restoring farmland polluted by heavy metals |
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Application publication date: 20190108 |