CN109746255A - A kind of method of activator joint Phytoremediation of Soils Contaminated by Heavy Metals - Google Patents
A kind of method of activator joint Phytoremediation of Soils Contaminated by Heavy Metals Download PDFInfo
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- CN109746255A CN109746255A CN201910210316.6A CN201910210316A CN109746255A CN 109746255 A CN109746255 A CN 109746255A CN 201910210316 A CN201910210316 A CN 201910210316A CN 109746255 A CN109746255 A CN 109746255A
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- heavy metal
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Abstract
The invention discloses a kind of method of activator joint Phytoremediation of Soils Contaminated by Heavy Metals, includes the following steps: that (1) is planted: planting heavy metal accumulation plant in contaminated soil；(2) it activates: aqueous citric acid solution is sprayed to contaminated soil；(3) it gathers in: gathering in the aerial part and under ground portion of plant respectively；(4) subsequent processing: the aerial part of harvest and under ground portion are cleared up, and extract heavy metal, repeat to implement activation step and/or harvesting steps.This method has many advantages, such as that repairing effect is good, it is short that in-situ immobilization, repairing efficiency can be achieved, and is of great significance for improving phytoremediation technology in the application range of contaminated soil remediation field.
Description
Technical field
The present invention relates to the Prevention Technique of heavy-metal contaminated soil, in particular to an a kind of activator joint phytoremediation huge sum of money
Belong to the method for contaminated soil.
Background technique
Currently, heavy metal pollution of soil is serious, the heavy metal Cd in soil can also influence human health by food chain.Cause
This, heavy metal pollution of soil is badly in need of administering, and especially repair to cadmium pollution soil seems especially urgent.
Phytoremediation is often referred to the plant for having enrichment to the pollutant in the grown on soil of heavy metal pollution, wait plant
After object draws heavy metal-polluted soil by own growth metabolic activity, by plant harvest and subsequent processing is carried out (as ashing is recycled
Deng), thus the method for obtaining certain repairing effect.Phytoremediation generally includes: plant extract, phytovolatilization and plant stability.
Currently, phytoremediation technology has the original position of governance process, permanent, the warp of effect as a kind of emerging restorative procedure
Ji property, post-processing simplification and many advantages such as aesthetics and the compatibility of environment, but there is also the poison due to heavy metal simultaneously
Evil acts on and inhibits plant growth, reduces biomass, the extended technical bottleneck of repairing efficiency.Further, since a huge sum of money in soil
The low biological effectiveness belonged to is low, and causing heavy metal to be not easy to be absorbed by plants is also the key factor for restricting phytoremediation efficiency.
In order to improve the repair rate of heavy metal cadmium soil, activator is added in soil to promote plant absorption soil
In other forms heavy metal cadmium.After activator enters soil, Study on Availability Control of Heavy Metals in Soil can be increased, promote plant to soil
The accumulation of earth heavy metal.However, though a soil huge sum of money can be effectively reduced in traditional chelating agent, inorganic acid etc. when using as activator
Belong to content, but the destruction of soil physico-chemical property and biological structure may also be will cause simultaneously, leads to loss of soil nutrient, plant is not
It can normal growth.
Summary of the invention
Goal of the invention: heavy metal planting is combined using activator it is an object of the present invention to provide a kind of, improves and repairs weight
The method of metallic pollution soil efficiency.
Technical solution: the present invention provides a kind of method of activator joint Phytoremediation of Soils Contaminated by Heavy Metals, including such as
Lower step:
(1) it plants: planting heavy metal accumulation plant in contaminated soil；
(2) it activates: aqueous citric acid solution is sprayed to contaminated soil；
(3) it gathers in: gathering in the aerial part and under ground portion of plant respectively；
(4) subsequent processing: the aerial part of harvest and under ground portion are cleared up, and extract heavy metal, repeat to implement to live
Change step and/or harvesting steps.
By adding biodegradable citric acid in the agricultural land soil of pollution as heavy metal in above-mentioned technical proposal
Activator can not only reduce soil pH, increase the activity and mobility of heavy metal, can also pass through the network of molecular structure carboxyl
Cooperation is used, and forms soluble complexes with metal ion, reduces suction-operated of the soil particle to heavy metal ion.As one kind
Efficient heavy metallic activation agent, organic acid include the surface complexes that citric acid etc. can form internal layer annular with Fe, electronics to
Center Fe ion-transfer leads to the bonding declines of Fe and clay lattice, promotes the dissolution of Fe.
The heavy metal of the reference states such as Fe-Mn is released as a whole, thus addition citric acid can increase heavy metal
Removal.Citric acid solution can drench the various metals such as chromium, manganese, mercury, lead, cadmium, lead, copper, zinc out, and the addition of citric acid changes soil
Earth Heavy Metals increase Study on Availability Control of Heavy Metals in Soil, to promote accumulation of the plant to heavy metal-polluted soil, and with growth
It is plant combined that speed is fast, biomass is big, can not only substantially reduce activator and rinsing water consumption, reduce living using activator
Change drenches heavy metal-polluted soil out and easily causes the environmental risks such as underground water pollution, reduces soil remediation cost, moreover it is possible to improve pollution amelioration
Speed.
Further, the heavy metal in the step (1) is cadmium.The pollution of cadmium is more universal in soil, to the shadow of plant
Sound is larger, significant using method repairing effect of the invention.
The heavy-metal contaminated soils such as cadmium are effectively repaired the utility model has the advantages that the present invention can be realized, are not destroying soil
Under the premise of ecological environment and existing plantation function, the purpose of the in-situ immobilization to cadmium pollution soil, guarantee agricultural product security is realized.
Present invention reduces soil remediation cost, the simple phytoremediation period is short and does not draw heavy metal, for improving phytoremediation skill
Art is of great significance in the application range that heavy-metal contaminated soil repairs field.
Specific embodiment
Embodiment 1
For rural area soil outside examination soil southeast university, west gate, Jiulong Lake, this area's soil pH is 6.89, belongs to weak acid
Property soil, the content of organic matter is lower, be 10.49gkg-1, 2mm sieve is crossed after air-drying, external source adds CdCl2Make soil with lead acetate
Cadmium, lead content respectively reach the requirement in table 1, to simulate the different degrees of lead of soil, cadmium combined pollution.Each processing group soil sample is filled
After dividing mixing, soil moisture content is adjusted to the 60% of field capacity, after being aged a period of time, as simulation cadmium, lead contamination
Soil.Potted plant experiment carries out in greenhouse.Using upper and lower bore (internal diameter) be respectively 21cm, 13cm and height is the plastics of 12cm
Basin as culturing pot, every basin be packed into air-dried 2mm nylon mesh for trying soil 1.5kg.Base manure (NP is applied simultaneously2O5K2O=
200:200:132mg/kg, with 0.43gkg-1Urea, 0.39gkg-1KH2PO4Application) other organic fertilizers can also be applied,
A certain amount of deionized water is added, soil moisture is made to reach 60% of maximum field capacity or so, greenhouse balances after two weeks, will
The direct seed covering of rye grass grass seeds is in basin, seed upper layer 2~3mm of blinding.Thinning after equal grass seeds emergence, guarantees every basin number of plant
It is equal, screening activator is added in plant harvesting the last fortnight, phytomass is measured after harvest and its Different Organs heavy metal contains
Amount, and measure heavy metal-polluted soil concentration.Each sample is in triplicate.The cropping pattern of above-mentioned heavy metal accumulation plant is the spring sowing autumn
Receipts or autumn planting summer harvest mode.
1 simulating pollution heavy metal content in soil of table
| Processing | Pb(mg/kg) | Cd(mg/kg) |
| Low pollution | 500 | 0.6 |
| Middle pollution | 1000 | 1.2 |
| Heavily contaminated | 1500 | 1.8 |
Influence of 2 activator of table to rye grass different parts concentration coefficient and transfer ratio
As shown in Table 2, rye grass root system is very high to the accumulation ability of Cd, and more than 1, and cauline leaf concentration coefficient is lower, but
Apply activator and effectively facilitates rye grass root system and cauline leaf to the concentration coefficient of Cd；Rye grass has certain enrichment to Pb
Potentiality, but its aerial part point is respectively less than 1 to the concentration coefficient of Pb under ground portion point.When low pollution, citric acid promotes rye
Grass enhances the concentration coefficient of Pb, to when middle pollution, since control group plants root system lead content is lower, turns in rye grass body
It is smaller to transport albumen destruction, and citric acid promotes root system largely to absorb Pb and it is stronger to transport protein destruction, to high dirty
When dye, since Pb concentration coefficient reaches 0.48 in control group root system, transport protein structure is caused to be seriously damaged, so that transhipment
Coefficient significantly reduces, and the addition of citric acid is so that this destruction is buffered, but since activator concentration is limited, and heavy metal
Concentration is higher, thus its transfer ratio is lower than intermediate pollution and high pollution.
Compared with control group single plant reparation, when low pollution, citric acid is combined with rye grass makes the reduction of soil Cd content
10.17%；But P in soil b content is made to reduce by 15.40% less；When middle pollution, soil Cd content is made to reduce 2.00%；Make soil
Earth Pb content reduces by 4.02%；When heavily contaminated, soil Cd content is made to reduce by 7.72%；P in soil b content is set to reduce by 5.53%.
Embodiment 2
The test site of the present embodiment is located at city, Jiangsu, and regional soil pH is 6.56, belongs to faintly acid soil；It is organic
Matter content is lower, is 2.58%；The total cadmium content of soil is 4.5mg.kg-1, and soil cadmium concentration is more than " standard of soil environment quality "
15 times of (GB 15618-1995) secondary standard (0.3mgkg-1) belong to cadmium serious pollution soil；Cadmium Content of Rice is
0.79mgkg-1 is more than " national food safety standard " (GB 2762-2012) cadmium in foods limit index (0.2mgkg-
1) 4 times.The region plot 1 is S.plumbizincicola and rye grass crop rotation, and plot 2 is Sedum alfredii Hance and rye grass crop rotation, and plot 3 is
Independent rye grass planting.The application rate of rye grass is 7kg/ mus, and the application rate of red-spotted stonecrop is 10000 plants/acre, and plant is received previous
Moon addition activator aqueous citric acid solution.Plant after harvest includes aerial part and under ground portion, soil is acquired, by harvest
Plant and soil are cleared up according to a conventional method, extract heavy metal cadmium.The result shows that 1 reduced rate of plot is 53.5%, plot 2 is reduced
Rate highest can achieve 66.22%, 3 reduced rate of plot minimum only 48.69%.Reduction efficiency is 2 plot > of plot, 1 plot >
3.Each plot is overall as time growth is on a declining curve, good in each plot repairing effect trend in two years.
3 plant heavy metal accumulation characteristic of table
As can be seen from Table 3, rye grass concentration coefficient is much smaller compared with for red-spotted stonecrop, and rye grass major part Cd is enriched with root
Portion is unfavorable for plant extract, and the tenor of S.plumbizincicola is greater than Sedum alfredii Hance, and it is better to transport coefficient, can will be golden
Belong to and being greatly transported on the ground.
Embodiment 3
The test site of the present embodiment is located at Jiangsu city town.Regional soil pH is 6.56, belongs to faintly acid soil；
The content of organic matter is lower, is 2.58%；The total cadmium content of soil is 4.5mgkg-1, soil cadmium concentration is more than " soil environment quality
Standard " (GB 15618-1995) secondary standard (0.3mgkg-1) 15 times, belong to cadmium serious pollution soil；Cadmium Content of Rice is
0.79mg·kg-1, it is more than " national food safety standard " (GB 2762-2012) cadmium in foods limit index (0.2mgkg-1)
4 times.The region one of plot in 15 mu of ground uses rape and Jujun grasses crop rotation.The application rate of rape is 0.5kg/ mus, huge
The application rate of Juncao is 3000 sections/mu.The plant harvesting previous moon adds activator.Plant after harvest include aerial part and
Under ground portion acquires soil, the plant of harvest and soil is cleared up according to a conventional method, extracts heavy metal cadmium.As a result such as table 4, oil
Dish and the transhipment coefficient of Jujun grasses are respectively 2.725 and 1.145, and activator combines rape and the restorative procedure of Jujun grasses crop rotation can
The reduction efficiency of the effective Cd content of soil is set to reach 61.32%.
4 plant heavy metal accumulation characteristic of table
Claims (6)
1. a kind of method of activator joint Phytoremediation of Soils Contaminated by Heavy Metals, characterized by the following steps:
(1) it plants: planting heavy metal accumulation plant in contaminated soil；
(2) it activates: aqueous citric acid solution is sprayed to contaminated soil；
(3) it gathers in: gathering in the aerial part and under ground portion of plant respectively；
(4) subsequent processing: the aerial part of harvest and under ground portion are cleared up, and extract heavy metal, repeat to implement activation step
Rapid and/or harvesting steps.
2. the method for activator joint Phytoremediation of Soils Contaminated by Heavy Metals according to claim 1, it is characterised in that: institute
Stating heavy metal accumulation plant in step (1) is rye grass and/or red-spotted stonecrop.
3. the method for activator joint Phytoremediation of Soils Contaminated by Heavy Metals according to claim 1, it is characterised in that: institute
Stating heavy metal accumulation plant in step (1) is rape and Jujun grasses.
4. the method for activator joint Phytoremediation of Soils Contaminated by Heavy Metals according to claim 1, it is characterised in that: institute
The cropping pattern for stating the heavy metal accumulation plant of step (1) is spring sowing autumn harvest or autumn planting summer harvest mode.
5. the method for activator joint Phytoremediation of Soils Contaminated by Heavy Metals according to claim 1, it is characterised in that: institute
Apply organic fertilizer into contaminated soil during stating step (1) plantation heavy metal accumulation plant.
6. the method for activator joint Phytoremediation of Soils Contaminated by Heavy Metals according to claim 1, it is characterised in that: institute
Stating the heavy metal in step (1) is cadmium.
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Cited By (9)
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| CN110280584A (en) * | 2019-07-12 | 2019-09-27 | 江西洁地环境治理生态科技有限公司 | A kind of heavy metal in soil biology removing method |
| CN110814005A (en) * | 2019-11-08 | 2020-02-21 | 中冶南方都市环保工程技术股份有限公司 | Method for restoring soil polluted by heavy metal cadmium in northern farmland |
| CN111299316A (en) * | 2019-11-25 | 2020-06-19 | 中节能大地环境修复有限公司 | Plant extraction-agronomic regulation combined remediation method for slightly-alkaline heavy metal contaminated farmland soil |
| CN112207122A (en) * | 2020-09-23 | 2021-01-12 | 内蒙古农业大学 | Method for remedying heavy metal pollution of calcareous soil |
| CN113351640A (en) * | 2021-06-03 | 2021-09-07 | 西安理工大学 | Method for repairing cadmium and lead combined polluted soil by combining chelating agent with ryegrass |
| 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 |
| CN113909282A (en) * | 2021-10-29 | 2022-01-11 | 南京大学 | Plant management method for heavy metal contaminated soil |
| CN114160570A (en) * | 2021-12-08 | 2022-03-11 | 中国农业科学院农田灌溉研究所 | Remediation method for heavy metal cadmium contaminated soil |
| CN115382894A (en) * | 2022-09-26 | 2022-11-25 | 辽宁大学 | Ecological restoration method suitable for cadmium-polluted soil in northern area |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110280584A (en) * | 2019-07-12 | 2019-09-27 | 江西洁地环境治理生态科技有限公司 | A kind of heavy metal in soil biology removing method |
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| CN111299316A (en) * | 2019-11-25 | 2020-06-19 | 中节能大地环境修复有限公司 | Plant extraction-agronomic regulation combined remediation method for slightly-alkaline heavy metal contaminated farmland soil |
| CN112207122A (en) * | 2020-09-23 | 2021-01-12 | 内蒙古农业大学 | Method for remedying heavy metal pollution of calcareous soil |
| CN113351640A (en) * | 2021-06-03 | 2021-09-07 | 西安理工大学 | Method for repairing cadmium and lead combined polluted soil by combining chelating agent with ryegrass |
| 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 |
| 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 |
| CN113909282A (en) * | 2021-10-29 | 2022-01-11 | 南京大学 | Plant management method for heavy metal contaminated soil |
| CN114160570A (en) * | 2021-12-08 | 2022-03-11 | 中国农业科学院农田灌溉研究所 | Remediation method for heavy metal cadmium contaminated soil |
| CN115382894A (en) * | 2022-09-26 | 2022-11-25 | 辽宁大学 | Ecological restoration method suitable for cadmium-polluted soil in northern area |
| CN115382894B (en) * | 2022-09-26 | 2024-01-02 | 辽宁大学 | Ecological restoration method suitable for cadmium-polluted soil in northern area |
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