CN105598142B - A kind of method of restoring cadmium polluted agricultural land soil - Google Patents
A kind of method of restoring cadmium polluted agricultural land soil Download PDFInfo
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- CN105598142B CN105598142B CN201610029445.1A CN201610029445A CN105598142B CN 105598142 B CN105598142 B CN 105598142B CN 201610029445 A CN201610029445 A CN 201610029445A CN 105598142 B CN105598142 B CN 105598142B
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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
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Abstract
The invention discloses a kind of methods of restoring cadmium polluted agricultural land soil, belong to cadmium pollution soil reparation and Treatment process field, which solve existing Cd-polluted farmland soil restoring technology effect is poor, at high cost, reparation is not thorough, still it cannot continue the problem of cultivating, seriously affecting farmland ecological environment after reparation.The method of the present invention turns over its soil, hack, Fen Long, setting drainage ditch the following steps are included: (1) selected Cd-polluted farmland；(2) 172 cutting of Su Liu is planted in through step (1) treated Cd-polluted farmland soil；(3) agronomy being carried out to 172 cutting of Su Liu in step (2) to manage and protect, including watering, control worm, weeding, the cutting in step (2) is made to survive simultaneously normal growth.The present invention can effectively improve Cd-polluted farmland soil remediation effect, and rehabilitation cost is low, and repairing efficiency is stable, lasting, permanent, and manual labor amount is smaller, belong to natural recovery technique, while bringing good ecological environment to farmland.
Description
Technical field
The invention belongs to cadmium pollution soil reparations and Treatment process field, more specifically to a kind of restoring cadmium polluted
The method of agricultural land soil.
Background technique
Influence of the heavy metal pollution to environment is always the research hotspot of field of ecology, and cadmium (Cd) pollution more induces one relatively
Concern administers farmland Cd pollution and is of great immediate significance in China.It administers farmland Cd pollution and needs mature recovery technique,
Cd Pollution in Soil phytoremediation technology is fundamentally to remove the method put things right once and for all that heavy metal is remained in soil, has life
State, it is sustainable, green the features such as, be also easiest to acceptable.For the phytoremediation technology of the heavy-metal contaminated soils such as Cd,
Extensive concern by ambits such as agrology, environmentology, ecology, agronomy, geochemistry for many years, it is dirty that forefathers study Cd
The phytoremediation technology of dye soil is also among continuous exploration with breakthrough.Phytoremediation technology be suitable in, low intensive big model
Pollution control is enclosed, it can be in the case where destroying ecological environment of soil holding soil texture, it directly will be a large amount of by root system of plant
Heavy metal element absorbs, environmentally protective, has permanent effect to the improvement of heavy-metal contaminated soil.Modern soil is heavy metal-polluted
Dye phytoremediation technology research is started in developed country, once has some developed countries to develop artificial wetland in discharge of industrial wastes mouth and plants
Aquatic macrophyte is planted, for absorbing Heavy Metals in Waters etc..There are two basic orientation for phytoremediation technology research, first is that finding
The big biomass plant of heavy metal-polluted soil can be absorbed, second is that finding the over-accumulated plant that can absorb heavy metal-polluted soil；Super accumulation is planted
Object is exactly the plant of energy excess Enriching soil heavy metal, is the mainstream of current phytoremediation technology research, is mostly with herbaceous plant
It is main.Herbaceous plant is many kinds of, and resistance is strong, strong to the patience of heavy metal with extensive adaptability and indomitable vitality,
It is also widely used for the research and development of heavy-metal contaminated soil phytoremediation technology.Presently found various heavy hyperaccumulative plant is all
Belong to herbaceous plant, such as: arsenic over-accumulated plant ciliate desert-grass, zinc Cd hyperaccumulator are sky blue to hold back blue dish, manganese hyperaccumulative plant quotient
Land etc..Super enriching plant in herbaceous plant still has stronger adaptability to high concentration heavy metal, can be effectively protected
Surface soil is enriched with high concentration metal.But herbal biomass is smaller, the total amount for extracting heavy metal-polluted soil is few, no
Large area be can be suitably used for by Cd polluted agricultural land.Big biomass plant can overcome above-mentioned super cumulant biological treatment heavy metal pollution
When existing defect, but it is also immature using big biomass plant treatment heavy metal (especially Cd) pollution technology, it is ineffective.
Chinese Patent Application No. 200710020380.5, the publication date patent document on the 15th of August in 2007, discloses one kind
The plant restoration method of soil of zinc-cadmium combined pollution, it is characterized in that by S.plumbizincicola cultivation in the zinc-cadmium combined pollution soil that need to be administered
Earth region, annual harvesting and the harvested S.plumbizincicola of transfer processing.In order to achieve the purpose that efficiently to administer, on cultivation management
It can be gathered in twice annual July and November；It can also be by S.plumbizincicola and elsholtzia splendens interplanting.The technical solution of the disclosure of the invention
Using herbaceous plant, biomass is smaller, and the total amount for extracting heavy metal-polluted soil is few, is not applied for large area by Cd dirt
Contaminate farmland.
Chinese Patent Application No. 200910024586.4, the patent application document in publication date on July 22nd, 2009, discloses
A kind of plant restoration method of soil polluted by heavy metal cadmium belongs to the remediation contaminated soil field in environmental protection.Its step
Are as follows: the content of cadmium in (A) periodic measurement soil, carry out slotting kind of willow: slotting kind of (B) willow is added after two months by ethyl lactate
With the chemical enhancer of ethylenediamine tetra-acetic acid composition.Willow in above-mentioned steps (A) is Su Liu clone J1011, is planted close
Degree is to plant 4~6 plants for every square metre when the content of cadmium is 6MG/KG in every soil.It is short that plant can be avoided using the invention
Small, the heavy metal cadmiums phytoremediation such as the speed of growth is slow, the upperground part biomass is small defect；And it improves and is individually matched with organic
Remediation efficiency of the body as chelating extractant remediating heavy metal, rehabilitation cost are lower；The use of lactate reduces synthesis chelating
The usage amount of agent such as EDTA, to reduce the environmental risk of heavy metal cadmium in plant extract rehabilitating soil.Chinese patent application
Numbers 200910184526.9, it is compound to disclose a kind of polycyclic aromatic hydrocarbon-cadmium on 2 10th, 2010 patent application documents of publication date
The chemical strengthening plant restoration method of contaminated soil, belongs to remediation contaminated soil field.It the steps include: cadmium in (A) measurement soil
With the content of Phenanthrene and pyrene, slotting kind of willow is carried out；(B) it is added after four months by ethyl lactate and second two for slotting kind of willow
The chemical enhancer of amine tetraacethyl composition.Willow is golden silk willow J1011, and planting density is respectively every 5,50 and 6mg/kg soil
Earth China and Philippines, pyrene and every square metre of cadmium plant 4~6 plants.The invention avoids that plant is short and small, the speed of growth is slow, the upperground part biomass
The defect of the phytoremediations such as small；Reduce the environmental risk of heavy metal cadmium in plant extract rehabilitating soil；These chemical enhancers
Addition individually use organic ligand as the remediation efficiency of chelating extractant remediating heavy metal improving, while also enhancing to soil
The repairing effect of organic pollutant polycyclic aromatic hydrocarbon in earth, reparation while realizing cadmium and polycyclic aromatic hydrocarbon composite pollution in soil.
Technical solution disclosed in above-mentioned two pieces patent application is required to addition chemical enhancer, in practical applications higher cost, and not
It can avoid bringing new pollution to soil, be easily destroyed soil natural ecological environment.
Yangtze river delta region including Jiangsu is that China arable land huge sum of money pollutes one of more serious area, and right at this stage
Jiangsu is ploughed for Heavy Metal Pollution, and the heavy metal pollutions practical recovery techniques in short supply such as cadmium are administered.Research and develop relatively economical
The research of phytoremediation in heavy metal contaminated soils such as practical, inexpensive cadmium are extremely urgent.
Summary of the invention
1, it to solve the problems, such as
Poor, at high cost for existing Cd-polluted farmland soil restoring technology effect, reparation is not thorough, and still cannot after reparation
Continue the problem of cultivating, seriously affecting farmland ecological environment, the present invention provides a kind of method of restoring cadmium polluted agricultural land soil, energy
Cd-polluted farmland soil remediation effect is effectively improved, rehabilitation cost is low, and repairing efficiency is stable, lasting, permanent, and manual labor amount
It is smaller, belong to natural recovery technique, while bringing good ecological environment to farmland.
2, technical solution
To solve the above problems, the present invention adopts the following technical scheme that.
A kind of method of restoring cadmium polluted agricultural land soil, comprising the following steps:
(1) Cd-polluted farmland is selected, its soil is turned over, hack, Fen Long, setting drainage ditch；
(2) 172 cutting of Su Liu is planted in through step (1) treated Cd-polluted farmland soil；
(3) agronomy is carried out to 172 cutting of Su Liu in step (2) to manage and protect, including water, control worm, weeding, make in step (2)
Cutting survive and normal growth.
Preferably, turned in the step (1), hack, point ridge depth of soil be 20-22cm.
Preferably, soil divides the width on ridge to be 3.9m in the step (1)；Spacing between every ridge is 1.2m.
Preferably, the spacing that plants of cutting is 40cm × 30cm in the step (2).
Preferably, cutting normal growth expires and connects root all shiftings in 1-1.5 Nian Houcong agricultural land soil in the step (3)
It walks, plants 172 cutting of Su Liu again, removed again to year and a day, repeated 3-5 times, complete the reparation of Cd-polluted farmland soil.
Preferably, it further includes cleaning fallen leaves that the agronomy in the step (3), which is managed and protected,.
3, beneficial effect
Compared with the prior art, the invention has the benefit that
(1) present invention plants Su Liu 172 in Cd-polluted farmland soil, by drawing soil in 172 growth course of Su Liu
In remaining Cd, Cd in soil can be made to reduce year by year, test data, which is shown, can make Cd content in contaminated soil average in 1 year
Decline 17.2%, the Cd content entire lowering 40% or so of Cd-polluted farmland soil, makes the Cd content in agricultural land soil in 1.5 years
It is greater than 5mg/kg before processing and drops to 3mg/kg or so, institute in agricultural land soil can also be absorbed simultaneously in 172 growth course of Su Liu
Remaining part heavy metal Zn, optimizes the ecological environment of agricultural land soil further；
(2) turned in step (1) of the present invention, hack, point ridge depth of soil be 20-22cm, make the root of Su Liu 172
System can adequately contact with the cadmium pollution soil of 20-22cm depth around it, thus make Cd-polluted farmland obtain it is more clean,
Thoroughly processing；
(3) soil divides the width on ridge to be 3.9m in step (1) of the present invention, and the spacing between every ridge is 1.2m, and cutting
Planting spacing is 40cm × 30cm, and the root system after enabling Su Liu 172 to grow up more comprehensively covers handled agricultural land soil, mentions
High cadmium pollution treatment effect；
(4) cutting normal growth expires and connects root in 1-1.5 Nian Houcong agricultural land soil and all remove in step (3) of the present invention, weight
172 cutting of Su Liu newly is planted, is removed again to year and a day, is repeated 3-5 times；Su Liu 172 can be made to play maximum processing effect, simultaneously
It avoids the cadmium element absorbed in Su Liu 172 time from spitting and generates secondary pollution into agricultural land soil；It repeats to make at cadmium pollution for 3-5 times
It manages more thorough；
(5) it further includes cleaning fallen leaves that the agronomy in step (3) of the present invention, which is managed and protected, to prevent the cadmium of 172 root absorption of Su Liu
Element generates secondary pollution to agricultural land soil by fallen leaves, to improve the effect that Su Liu 172 handles Cd-polluted farmland soil
And efficiency.
Detailed description of the invention
Fig. 1 is to select agricultural land soil Cd content in the embodiment of the present invention 1 to change over time figure；
Fig. 2 is that 172 leaf Cd content of Su Liu changes over time figure in the embodiment of the present invention 1；
Fig. 3 is that Su Liu 172 grows into each organization internal Cd content distribution figure at 1.5 years in the embodiment of the present invention 1.
Specific embodiment
Below with reference to related test process, main chart and implementation illustration, the present invention will be further described:
Embodiment 1
A kind of method of restoring cadmium polluted agricultural land soil, comprising the following steps:
(1) select Wuxi City, Jiangsu Province Xishan District Cd-polluted farmland, area be 2.6 mu, measure its soil Cd content and
Respectively, soil Cd is unevenly distributed, and Cd content is between 4-13mg/kg, average Cd content is greater than 6.0mg/kg；The huge sum of money such as Cd
Belonging to pollutant and is mainly gathered in earth's surface into the soil between 20cm, not only Cd, Hg are obviously higher for topsoil, but also with
Slight Zn enrichment and soil acidification；80 meters of length, 22 meters wide (about 2.6 mu of occupied area) after selecting is arranged, is rented
It is mechanical with manually will about 20cm or more deep soil is fine crushing, leveling, trench digging divides ridge, is divided into 5 ridges, every ridge according to field natural length
Ground is 80m long × 3.9m wide, the gutter 1.2m and personnel's walking passageway is stayed between ridge and ridge, it is deep that field surrounding digs 80cm or more
Ditch is isolated with surrounding, while being used as experimental field gutter；
(2) prior preparation is planted according to 40cm × 30cm spacing in through step (1) treated Cd-polluted farmland soil
Good 172 branch of Su Liu, Mr. Yu disposably plant 13000, wicker, survive about 90% or more, foundation after 1 month on April 10,
Willow survives situation and carries out appropriate thinning or interpolation, the Su Liu 17 finally survived about 11000；
(3) agronomy is carried out to 172 cutting of Su Liu in step (2) to manage and protect, including water, control worm, weeding, make in step (2)
Cutting survive and normal growth；It cleans and falls leaves every half a year, and cadmium pollution soil sampling analysis is chemically examined 1 time, acquire every time
20, fixing soil sample, 20, Folium Pterocaryae sample；Accumulation acquisition pedotheque 150 terminates to repair after 160, Folium Pterocaryae sample
It is multiple.
To improve the method for the present invention to the treatment effect of Cd-polluted farmland soil, in the present embodiment step (3) test into
Row connects root into 1.5 Nian Shicong agricultural land soils and takes whole willow plants 172 cutting of Su Liu again again, removes again to full 1.5 years,
It is repeated 3 times, completes the reparation of Cd-polluted farmland soil.
The present embodiment plants 172 branch of Su Liu in the serious polluted agricultural land of the heavy metals such as Cd can obtain obvious repairing effect.
As shown in Figure 1, planting cutting to step (3) from step (2) in the present embodiment and repair terminates Cd changes of contents in agricultural land soil, soil
Earth highest Cd content drops to 5.4mg/kg from 10.7mg/kg, and the maximum range of decrease is close to 50%, the willow absorbent earth in first 1.5 years
Earth Cd effect is most obvious, but has the Battery Plant of normal operation, Battery Plant pair near the Cd-polluted farmland selected due to the present embodiment
The selected agricultural land soil has lasting contact scar, thus in Fig. 1 subsequent 1.5 years because willow is taken root deep, Cd in neighbouring soil
Pollution source is not cut off, and reparation field soil Cd content is caused the phenomenon that not dropping anti-liter occur, and essence is main with the willow later period
It absorbs less than remaining in the Cd in agricultural land soil and Cd that leaf absorbs in atmosphere is also not enough to offset Battery Plant's pollution sources and is supplied
The Cd given has substantial connection.As shown in Fig. 2, compared the Cd of grown willow different times Folium Pterocaryae in this implementation containing quantitative change
Change, it can be seen that the Cd content and its BCF value of Folium Pterocaryae are all relatively highest in First Year, this is raw with willow in First Year
It is long to be planted in that superficial part, to fully absorb enough Cd from Cd high-content soil related, be in Fig. 1 mid-early stage soil Cd content
Existing sharp fall is corresponding；When willow grows into 1.5 years, Cd is absorbed from soil and tends to be saturated, at this time willow plant
In organizational framework, soil Cd is still absorbed relatively at most (as shown in Figure 3) with tree root, leaf, it is main to illustrate that willow absorbs soil Cd
By leaf, tree root.
Therefore, step (3) proceeds in 1.5 Nian Shicong agricultural land soils in test and connects root and take whole willow in the present embodiment
It plants 172 cutting of Su Liu again again, removed, be repeated 3 times again to full 1.5 years, can continue to keep preceding processing in 1.5 years in Fig. 1
Effect, and then Cd-polluted farmland soil treatment dynamics and efficiency are improved, it can in the case where stopping the chronic pollutions such as Battery Plant
Thoroughly solve the cadmium pollution in agricultural land soil, reduction health, environmentally friendly ecological environment.
Embodiment 2
It is same as Example 1, except that: half mu is chosen in selected Cd-polluted farmland in embodiment 1 by common
Gardening plantation weeping willow and other nursery stocks compare, as the result is shown on the Cd contaminated land in same location, the present invention and its
By the plant of common garden plantation, there are significant differences in the effect for absorbing soil Cd for he, are with 1 term of plant growth leaf
, Cd content highest in the leaf of Su Liu 172,172 leaf of Su Liu absorb the bio-concentration factor BCF of soil Cd in the present invention
(BCF=leaf Cd concentration/soil Cd concentration) averagely reaches 6.33, much higher than weeping willow, Acer palmatum ' Atropurpureum' etc. by common garden plantation its
Its nursery stock, comparing result are as follows: (being shown in Table 1).
The Su Liu 172 of the present invention of table 1, other nursery stock leaves, pedotheque Cd content (mg/kg) analyze result
Table 1 shows that the ability that only leaf absorbs pedo relict Cd of the Su Liu 172 in the present invention is exactly weeping willow, Acer palmatum ' Atropurpureum', wide jade
The decades of times of the nursery stocks such as orchid, in addition, Su Liu 172 itself has very big biomass, is easy to survive, is also easy transplanting and growth fastly
Speed can in conjunction with, to the processing mode of Su Liu 172, having many advantages in terms of repairing agricultural land soil Cd pollution in the present invention
Generate extraordinary effect.
Embodiment 3
It is same as Example 1, except that: to improve the method for the present invention to the treatment effect of Cd-polluted farmland soil,
Step (3) proceeds in 1 Nian Shicong agricultural land soil to connect root and take whole willow in test in the present embodiment plants Su Liu again again
172 cuttings were removed again to full 1 year, are repeated 4 times, and the reparation of Cd-polluted farmland soil is completed.Although the embodiment is to Su Liu 172
Removal and to plant frequency higher, but can also play good repairing effect: soil highest Cd content drops to from 10.7mg/kg
6.3mg/kg, the maximum range of decrease is close to 41%.
Claims (1)
1. a kind of method of restoring cadmium polluted agricultural land soil, comprising the following steps:
(1) Cd-polluted farmland is selected, its soil is turned over, hack, Fen Long, setting drainage ditch；
(2) 172 cutting of Su Liu is planted in through step (1) treated Cd-polluted farmland soil；
(3) agronomy is carried out to 172 cutting of Su Liu in step (2) to manage and protect, including water, control worm, weeding, make inserting in step (2)
Item survives and normal growth；
Cutting normal growth, which is expired, in the step (3) connects root in 1-1.5 Nian Houcong agricultural land soil and all removes, and plants Soviet Union again
172 cutting of willow is removed again to year and a day, is repeated 3-5 times, and the reparation of Cd-polluted farmland soil is completed；
It further includes cleaning to fall leaves every half a year that agronomy in the step (3), which is managed and protected,；
Soil divides the width on ridge to be 3.9m in the step (1)；Spacing between every ridge is 1.2m；
The spacing that plants of cutting is 40cm × 30cm in the step (2)；
Turned in the step (1), hack, point ridge depth of soil be 20-22cm.
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| CN201610029445.1A CN105598142B (en) | 2016-01-15 | 2016-01-15 | A kind of method of restoring cadmium polluted agricultural land soil |
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| CN201610029445.1A CN105598142B (en) | 2016-01-15 | 2016-01-15 | A kind of method of restoring cadmium polluted agricultural land soil |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106269829B (en) * | 2016-10-28 | 2019-04-12 | 环境保护部华南环境科学研究所 | A method of extensively suitable efficient lossless in-situ immobilization is by heavy metal pollution farmland |
| CN107494087A (en) * | 2017-08-21 | 2017-12-22 | 广西贵港市恒桥米业有限公司 | A kind of implantation methods of organic glutinous rice |
| CN110508612B (en) * | 2019-09-02 | 2021-03-26 | 江苏省地质调查研究院 | Method for removing residual cadmium in farmland |
| CN114029323A (en) * | 2021-10-29 | 2022-02-11 | 南京大学 | Application of salix cheilophila J885 in treatment of cadmium-polluted soil |
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| CN101486041A (en) * | 2009-02-20 | 2009-07-22 | 南京大学 | Plant repairing method for soil polluted by heavy metal cadmium |
| CN102124886A (en) * | 2010-12-03 | 2011-07-20 | 天津师范大学 | Method for remedying lead-polluted soil by utilizing Salix dascladus |
| CN104289506A (en) * | 2014-10-21 | 2015-01-21 | 赵连祺 | Biological remediation method for soil polluted by cadmium, zinc, lead and copper ions |
| CN104289509A (en) * | 2014-10-21 | 2015-01-21 | 赵连祺 | Biological heavy metal contaminated soil remediation method |
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- 2016-01-15 CN CN201610029445.1A patent/CN105598142B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486041A (en) * | 2009-02-20 | 2009-07-22 | 南京大学 | Plant repairing method for soil polluted by heavy metal cadmium |
| CN102124886A (en) * | 2010-12-03 | 2011-07-20 | 天津师范大学 | Method for remedying lead-polluted soil by utilizing Salix dascladus |
| CN104289506A (en) * | 2014-10-21 | 2015-01-21 | 赵连祺 | Biological remediation method for soil polluted by cadmium, zinc, lead and copper ions |
| CN104289509A (en) * | 2014-10-21 | 2015-01-21 | 赵连祺 | Biological heavy metal contaminated soil remediation method |
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