CN108144954B - The method that the ecological blanket of fixed heavy metal combines removal heavy metal-polluted soil with plant - Google Patents
The method that the ecological blanket of fixed heavy metal combines removal heavy metal-polluted soil with plant Download PDFInfo
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- CN108144954B CN108144954B CN201711405266.4A CN201711405266A CN108144954B CN 108144954 B CN108144954 B CN 108144954B CN 201711405266 A CN201711405266 A CN 201711405266A CN 108144954 B CN108144954 B CN 108144954B
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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
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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
- B09C2101/00—In situ
Abstract
The present invention relates to the technical field of regeneration of contaminated soil, and in particular to a kind of ecological blanket of fixed heavy metal and its method that removal heavy metal-polluted soil is combined with phytoremediation.The method of removal heavy metal-polluted soil is combined the present invention provides a kind of ecological blanket of fixed heavy metal and its with phytoremediation.The ecological blanket includes modified zeolite middle layer, and inside and outside two layers permeable geotextiles of package zeolite middle layer.The ecological blanket is embedded under the topsoil of heavy metal pollution farmland, and over-accumulated plant is planted on topsoil, and irrigation process promotes heavy metal ion to migrate downward into solution, eventually by ecological blanket and harvest over-accumulated plant is removed, realizes the reparation of heavy-metal contaminated soil.The present invention realizes the effective synergy of chemical fixation-phytoremediation technology, high to the lead in soil, zinc, cadmium removal efficiency.
Description
Technical field
The present invention relates to the technical field of regeneration of contaminated soil, and in particular to a kind of ecological blanket of fixed heavy metal and its
The method of removal heavy metal-polluted soil is combined with phytoremediation.
Background technique
Heavy metal pollution of soil has the characteristics that chronicity, hysteresis quality, cumulative bad, can enter food through a variety of ways
Chain accumulation and amplification, and then threaten human health.The heavy metal pollution situation of China's agricultural land soil is complicated, and pollution range is wide, compels
A kind of restorative procedure easy to operate, effect is quick, cost is low will be developed by being essential.
Currently, the method for common improvement heavy-metal contaminated soil includes: engineering control method, such as soil moved in improve the original, soil removal and replacement；Object
Manage restorative procedure, such as electric heating repairing method, vitrification, electric repairing technique；Chemical remediation, as Soil leaching, chemistry are solid
It is fixed etc.；Phytoremediation technology and bioremediation technology.Complicated for operation, project amount is big, at high cost because administering for physical engineering method,
And soil texture and environment can be damaged, and can not be promoted on a large scale.Phytoremediation is to utilize super enriching plant
After absorbing, accumulating heavy metal element and transport to aerial part, by gathering in plant, the heavy metal in soil is removed.
There is phytoremediation regulation effect permanently, to soil environment to disturb, and small, rehabilitation cost is cheap, beautiful environment, post-processing letter
A series of economic technique superiorities such as easy, therefore become domestic and international hot research problem.Chemical fixation is by adding to contaminated soil
Add different modifying agents, by absorption, precipitating, complex reaction, heavy metal in soil is made mutually to be transferred to solid phase of soil by dissolving, changed
Becoming heavy metal-polluted soil occurrence patterns, " passivation " its biological effectiveness prevents its biogenic migration or is transferred in water or atmospheric environment,
To achieve the effect that reduce bioavailability of heavy metals and toxicity.This method has that flexible operation, cost are low, administer effect
The advantages that fruit is obvious, therefore it is well suited for the improvement for being widely used in China heavy metal pollution farmland of large area.Wherein, zeolite is to make
With a kind of more universal modifying agent.Zeolite has crystal rack-like structure, and there are many cavitys, duct in centre, can adsorb, store
A large amount of molecules have very strong adsorption capacity.Secondly, in zeolite crystal cation contacted with crystalline framework it is weaker, when zeolite and
When metal ion contacts, it is easy to cation exchange occur, so that adsorbing metal is cationic.
But chemical fixation and phytoremediation there are still some drawbacks.Chemical fixation can only be heavy metal-passivated,
It can not be removed from soil, modifying agent will receive the influence of Soil Factors, such as soil to the solidification effect of heavy metal
Moisture, pH, soil class, heavy metal type etc., when these factors change, cured heavy metal may be reactivated out
Come or convert, so that secondary pollution.Phytoremediation has the disadvantages such as repair time is long, biomass is low, to heavy metal pollution
The repairing efficiency of soil is too long, fails to be used widely.And chemical fixation is due to the weight that has been passivated in plant rhizosphere soil
Metal inhibits absorption of the over-accumulated plant to heavy metal to a certain extent, and therefore, chemical fixation and phytoremediation combine often
Combination effect is not achieved.Currently, the document report for not thering is temporarily the two combination to reach ideal effect.
And a kind of method that the present invention has creatively used ecological blanket, successfully by phytoremediation and chemical fixation knot
It has been closed that, by being wrapped up adsorbent material by geotextiles and being placed in soil lower layer, avoided to super enriching plant Rhizosphere Soil
The passivation of heavy metal ion in earth will not inhibit super enriching plant to the absorption of heavy metal, realize chemical fixation-plant and repair
Effective synergy of recovering technology can be removed quickly and effectively to lead, zinc, the cadmium in soil.Meanwhile adsorbent material uses a kind of spy
Very modified zeolitic material, greatly improves ecological blanket to the adsorption capacity of heavy metal-polluted soil.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is intended to provide a kind of ecological blanket of fixed heavy metal, utilizes this
Ecological blanket, heavy metal that can effectively in fixing soil, and realize the combination of chemical fixation and phytoremediation, fast and effeciently go
Except heavy metal-polluted soil.
Removal is combined the object of the invention is also to provide a kind of ecological blanket of fixed heavy metal and its with phytoremediation
The method of heavy metal-polluted soil.
The present invention provides a kind of ecological blanket of fixed heavy metal, which includes in zeolite middle layer and package zeolite
Inside and outside two layers permeable geotextiles of interbed.
Preferably, the internal layer geotextiles are non-using polypropylene synthetic staple fibers needling nonwoven geotextiles or terylene short fiber needle thorn
Weave geotextiles；Selected geotextiles are high with intensity, elongation percentage is low, ability of anti-deformation is strong, specific gravity is small, and corrosion-resistant, acid and alkali-resistance is good
The characteristics such as good water permeability.
Preferably, the outer layer geotextiles use polyester filament geotextiles；Polyester filament geotextiles have good power
Function, good water permeability are learned, and energy is anticorrosive, it is anti-aging, have the function of isolation, anti-filter etc., adapts to rough base, energy
Construction external force is resisted to destroy.
Preferably, the zeolite in the zeolite middle layer is Na type-acid-heat treatment modified zeolite；Modified zeolite
There is stronger adsorption capacity to heavy metal ion；
Further, in some preferred embodiments, the modified zeolite the preparation method comprises the following steps:
Natural zeolite is added in 0.5-1mol/L NaCl solution, 3-8h is shaken in water-bath at 60-90 DEG C of constant temperature, from
Heart separation, is washed with deionized water；Zeolite after cleaning is added in 0.1-0.3mol/L hydrochloric acid and handles 12-48h, spend from
Son is washed to neutrality, and 20-30 DEG C of constant temperature oscillation is dry by modified zeolite after cleaning；2-6h is roasted at 420-480 DEG C, it is cooling
It to room temperature, is filtered after being washed with deionized, up to Na type-acid-heat treatment modified zeolite after drying；
Further, in other preferred embodiments, the modified zeolite the preparation method comprises the following steps:
Natural zeolite is added in 0.5~1mol/L NaCl solution, 4-6h is shaken in water-bath at 75-85 DEG C of constant temperature, from
Heart separation, is washed with deionized water；Zeolite after cleaning is added in 0.1~0.3mol/L hydrochloric acid and handles 20-26h, is spent
Ion is washed to neutrality, and 22-28 DEG C of constant temperature oscillation is dry by modified zeolite after cleaning；2.5-4h is roasted at 440-460 DEG C,
It is cooled to room temperature, is filtered after being washed with deionized, up to Na type-acid-heat treatment modified zeolite after drying.
Preferably, the zeolite middle layer is in addition to containing zeolite, also containing the insoluble phosphorus for being vaccinated with microbial bacteria
Phosphate compounds；Phosphate compounds can be by absorption, the fixed heavy metal of metathesis, can also be under the action of microorganism
It is slowly dissolved, forms phosphoric acid mineral deposits with heavy metal, while providing fertilizer efficiency for soil；
Further, the insoluble phosphate compound is hydroxyapatite, ground phosphate rock etc., preferably with zeolite
The hydroxyapatite that mass percent is 5~10%；
Further, the microbial bacteria is phosphate solubilizing bacteria, acid and alkali-resistance microbial bacteria etc., is preferably with the ratio of zeolite
106-1012The phosphate solubilizing bacteria of cfu/kg, wherein cfu is Colony Forming Unit.
A removal soil huge sum of money is combined the present invention also provides a kind of ecological blanket of fixed heavy metal and its with phytoremediation
The method of category, this method include the steps that following sequences:
A) fixation in situ of heavy metal-polluted soil and absorption: by ecological blanket be embedded in mild or moderate heavy metal pollution farmland topsoil it
15~20cm is descended, plants heavy metal over-accumulated plant on topsoil；In heavy metal over-accumulated plant growth course, according to soil
The watering of earth water shortage situation adjusts the 50%-70% that soil moisture content is field capacity；
Heavy metal over-accumulated plant largely absorbs the heavy metal in contaminated soil by root system, and is transferred on the ground
Portion；Meanwhile irrigation water and rainfall promote the vertical migration of heavy metal ion in the soil, part heavy metal ion with solution to
Lower to migrate the lower soil being not achieved to root system of plant, the modified zeolite layer in lower soil in ecological blanket passes through absorption-ion
Exchange interaction fixes the heavy metal ion in the soil liquid.
B) removal of heavy metal-polluted soil: fixing and absorb by 60-180 days heavy metals, and heavy metal has been adsorbed in removal
Ecological blanket, and harvest heavy metal over-accumulated plant overground part；
If heavy metal-polluted soil is still exceeded, repeats above-mentioned steps several times and strengthen repairing effect, it is final to realize a soil huge sum of money
The removal of category.
Preferably, the heavy metal in farmland of heavy metal pollution described in step a) be one of lead, cadmium, zinc, copper or
It is several.
Preferably, heavy metal over-accumulated plant described in step a) is heavy metal over-accumulated plant commonly used in the art,
Preferably environmental Sedum alfredii Hance.
Further, the ecological blanket is reusable: at 90-100 DEG C, with 1mol/L HCl and saturation NaCl
(volume 1:1) mixed liquid dipping washs the modified zeolite for having adsorbed heavy metal, cooling, washes after filtering.Modified boiling after cleaning
Stone can be recycled and reused for ecological blanket, and the filtrate after cleaning is handled as industrial wastewater.
The present invention overcomes traditional in-situ chemical technique for fixing only temporary reduction heavy metal activities, can not long term deactivation
Or the deficiency of removing heavy metals is gone, while solving directly application passivator and inhibiting asking for absorption of the over-accumulated plant to heavy metal
Topic, realizes the effective synergy of chemical fixation-phytoremediation technology, high to the lead in soil, zinc, cadmium removal efficiency.
The beneficial effects of the present invention are as follows:
(1) adsorbent material being wrapped up using permeable geotextiles, neither influence adsorbent material fixes the absorption of heavy metal-polluted soil,
Adsorbent material can be recycled simultaneously, realize that heavy metal is removed from soil.Overcoming traditional in-situ chemical technique for fixing can not grow
Phase is passivated or goes the deficiency of removing heavy metals.
(2) adsorbent material is wrapped up by geotextiles and is placed in soil lower layer, is avoided in super enriching plant rhizosphere soil
The passivation of heavy metal ion will not inhibit super enriching plant to the absorption of heavy metal, realize chemical fixation-phytoremediation skill
Effective synergy of art, it is high to the lead in soil, zinc, cadmium removal efficiency.
(3) method of modifying of the zeolite in adsorbent material provided by the invention greatly improves existing modified zeolite counterweight
The adsorption capacity of metal ion.
(4) adsorbent material provided by the invention using Na type-acid-heat treatment modified zeolite and/or is vaccinated with microbial bacteria
Insoluble phosphate compound scheme, the absorption and processing capacity of heavy metal-polluted soil are further enhanced.
(5) present invention process is simple, and material can be with repeated recycling utilize, and cost is low, quickly and effectively.
Specific embodiment
It is explained further the present invention with reference to embodiments, but embodiment does not make any type of limit to the present invention
It is fixed.
Embodiment 1
(1) preparation of middle layer zeolite: natural zeolite is added in 0.5mol/L NaCl solution, at 80 DEG C of constant temperature
5h is shaken in water-bath, and centrifuge separation is washed with deionized water；Zeolite after cleaning is added in 0.1mol/L hydrochloric acid and is handled for 24 hours,
It is washed with deionized water to neutrality, 25 DEG C of oscillation 30min of 160rpm constant temperature, modified zeolite is put into baking oven after cleaning, at 105 DEG C
Lower dry 2h；3h is roasted at 460 DEG C, is cooled to room temperature, is filtered after being washed with deionized, at 105 DEG C after dry 5h
To the stronger Na type-acid-heat treatment modified zeolite of adsorptivity.
(2) two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles (preparation of ecological blanket 1: are purchased from the western shellfish new material in Dezhou
Co., Ltd, product specification: SNGPP100) overlapping, (Dongguan City Lian Rui nonwoven section is purchased from polyester filament spunbond geotextiles up and down
Skill Co., Ltd, article No.: LR1010-010) it is covered on outer layer, four layers of geotextiles edge are stitched together, middle layer filling step
(1) ecological blanket 1 with fixed heavy metal effect is made in the modified zeolite being prepared, the dosage of modified zeolite in ecological blanket 1
For 2kg/m2。
Embodiment 2
(1) preparation of middle layer zeolite: natural zeolite is added in 1mol/L NaCl solution, is lauched at 80 DEG C of constant temperature
Bath concussion 5h, centrifuge separation are washed with deionized water；Zeolite after cleaning is added in 0.3mol/L hydrochloric acid and is handled for 24 hours, is used
Deionized water is washed till neutrality, and modified zeolite is put into baking oven, at 105 DEG C by 25 DEG C of oscillation 30min of 160rpm constant temperature after cleaning
Dry 2h；3h is roasted at 450 DEG C, is cooled to room temperature, is filtered after being washed with deionized, is obtained after dry 5h at 105 DEG C
The stronger Na type-acid-heat treatment modified zeolite of adsorptivity.
(2) preparation of ecological blanket 2: two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles are overlapped, use polyester filament up and down
Spunbond geotextiles are covered on outer layer, and four layers of geotextiles edge are stitched together, the modification that middle layer filling step (1) is prepared
The ecological blanket 2 with fixed heavy metal effect is made in zeolite, and the dosage of modified zeolite is 2kg/m in ecological blanket 22。
Embodiment 3
(1) preparation of middle layer zeolite: natural zeolite is added in 1mol/L NaCl solution, is lauched at 80 DEG C of constant temperature
Bath concussion 5h, centrifuge separation are washed with deionized water；Zeolite after cleaning is added in 0.3mol/L hydrochloric acid and is handled for 24 hours, is used
Deionized water is washed till neutrality, and modified zeolite is put into baking oven, at 105 DEG C by 25 DEG C of oscillation 30min of 160rpm constant temperature after cleaning
Dry 2h；3h is roasted at 450 DEG C, is cooled to room temperature, is filtered after being washed with deionized, is obtained after dry 5h at 105 DEG C
The stronger Na type-acid-heat treatment modified zeolite of adsorptivity.
(2) prepared by middle layer adsorbent material: phosphate solubilizing bacteria (being purchased from Guangdong Microbes Inst) is inoculated in hydroxy-apatite
Stone (be purchased from upper object Science and Technology Ltd. of Haikang nangzan, No. CAS: 1306-06-5, heavy metal :≤0.001%), with step (1) make
Standby obtained Na type-acid-heat treatment modified zeolite mixing, wherein the mass percent of hydroxyapatite and modified zeolite is
10%, the inoculum concentration of phosphate solubilizing bacteria is 10mL/kg (concentration: 108cfu/mL)；Obtain middle layer adsorbent material.
(3) prepared by ecological blanket 3: two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles being overlapped, are spun up and down with polyester filament
Viscous geotextiles are covered on outer layer, and four layers of geotextiles edge are stitched together, the middle layer that middle layer filling step (2) is prepared
Adsorbent material, is made the ecological blanket 3 with fixed heavy metal effect, and the dosage of 3 intermediate adsorbent material of ecological blanket is 2kg/m2.
Embodiment 4
(1) preparation of middle layer zeolite: natural zeolite is added in 1mol/L NaCl solution, is lauched at 80 DEG C of constant temperature
Bath concussion 5h, centrifuge separation are washed with deionized water；Zeolite after cleaning is added in 0.3mol/L hydrochloric acid and is handled for 24 hours, is used
Deionized water is washed till neutrality, and modified zeolite is put into baking oven, at 105 DEG C by 25 DEG C of oscillation 30min of 160rpm constant temperature after cleaning
Dry 2h；3h is roasted at 450 DEG C, is cooled to room temperature, is filtered after being washed with deionized, is obtained after dry 5h at 105 DEG C
The stronger Na type-acid-heat treatment modified zeolite of adsorptivity.
(2) prepared by middle layer adsorbent material: phosphate solubilizing bacteria (being purchased from Guangdong Microbes Inst) is inoculated in hydroxy-apatite
Stone (be purchased from upper object Science and Technology Ltd. of Haikang nangzan, No. CAS: 1306-06-5, heavy metal :≤0.001%), with step (1) make
Standby obtained Na type-acid-heat treatment modified zeolite mixing, wherein the mass percent of hydroxyapatite and modified zeolite is
5%, the inoculum concentration of phosphate solubilizing bacteria is 50mL/kg (concentration: 108cfu/mL)；Obtain middle layer adsorbent material.
(3) prepared by ecological blanket 4: two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles being overlapped, are spun up and down with polyester filament
Viscous geotextiles are covered on outer layer, and four layers of geotextiles edge are stitched together, the middle layer that middle layer filling step (2) is prepared
Adsorbent material, is made the ecological blanket 4 with fixed heavy metal effect, and the dosage of 4 intermediate adsorbent material of ecological blanket is 2kg/m2。
Comparative example 1
Prepare ecological blanket 5
The preparation of middle layer zeolite is changed to: by natural zeolite 3.0molL-18h is handled at 90 DEG C of NaOH solution, is passed through
It is washed with water after cold filtration, modified zeolite is put into baking oven, obtain the stronger modification of adsorptivity after dry 5h at 105 DEG C
Zeolite；
Remaining obtains ecological blanket 5 with embodiment 1.
Comparative example 2
Prepare ecological blanket 6
(1) preparation of middle layer zeolite: natural zeolite is added in 2mol/L NaCl solution, is lauched at 80 DEG C of constant temperature
Bath concussion 5h, centrifuge separation are washed with deionized water；Zeolite after cleaning is added in 1mol/L hydrochloric acid and is handled for 24 hours, is spent
Ion is washed to neutrality, and modified zeolite is put into baking oven by 25 DEG C of oscillation 30min of 160rpm constant temperature after cleaning, and does at 105 DEG C
Dry 2h；3h is roasted at 300 DEG C, is cooled to room temperature, is filtered after being washed with deionized, is changed after dry 5h at 105 DEG C
Property zeolite.
(2) preparation of ecological blanket 6: two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles are overlapped, use polyester filament up and down
Spunbond geotextiles are covered on outer layer, and four layers of geotextiles edge are stitched together, the modification that middle layer filling step (1) is prepared
The ecological blanket 6 with fixed heavy metal effect is made in zeolite, and the dosage of modified zeolite is 2kg/m in ecological blanket 62。
Experimental example 1
The ecological blanket of the embodiment 1-4 and comparative example 1-2 suitable size prepared is layed in flowerpot bottom respectively, surface is covered
Covering the thick air-dried soil for crossing 5mm sieve of 15cm, (soil is derived from the heavy metal pollution agricultural land soil in Shaoguan City of Guangdong Province somewhere, soil
PH 4.31, total metals: Cd 0.83mg/kg, Pb 302.54mg/kg, Cu 558.27mg/kg, Zn 701.34mg/
kg).Consistent Sedum alfredii Hance cuttage (plant spacing 5cm) into basin will be grown, Sedum alfredii Hance is derived from Quzhou City of Zhejiang Province
An ancient Pb-Zn deposits.In growing process, the moisture content for the every basin soil of (deionized water) guarantee that periodically waters is maintained
To 60% or so of field capacity.Sedum alfredii Hance is harvested after 60 days, the modified zeolite ecological blanket of heavy metal will be adsorbed from soil
It is taken out in earth, completes the removal of heavy metal in soil Cd, Pb, Zn, Cu.Sedum alfredii Hance is measured to heavy metal Cd, Pb, Zn, Cu
For adsorbent material in accumulation and ecological blanket to heavy metal Cd, the adsorbance of Pb, Zn, Cu, experimental data is shown in Table 1:
Table 1
Experimental example 2
The present embodiment is tested under the Dabaoshan Mine polluted water region in the Shaoguan City of Guangdong Province Wengyuan County village new Jiang Zhen Shang Ba
It swims farmland to carry out, wherein heavy metal Pb, Cd, Cu and Zn are more than national standard of soil environment quality (GB15618-1995).
After ploughing soil, the embodiment 1-4 and comparative example 1-2 ecological blanket prepared is layed in bottom surface, is used above ecological blanket
Agricultural land soil is piled into the field of 15cm thickness, and each field size is 1m × 2m.The environmental east of super accumulation is planted above field
Southern red-spotted stonecrop (the ancient Pb-Zn deposits that Sedum alfredii Hance is derived from Quzhou City of Zhejiang Province), the clip consistent southeast uniform in size when plantation
For red-spotted stonecrop overground part cuttage in soil, planting density is 10cm × 10cm.In growing process, periodically watering guarantees
The moisture content of every basin soil is maintained to 60% or so of field capacity.Sedum alfredii Hance is harvested after 3 months, will adsorb heavy metal
Modified zeolite ecological blanket taken out from soil, complete heavy metal in soil Cd, Pb, Zn, Cu removal.Measure Sedum alfredii Hance pair
Heavy metal Cd, the accumulation of Pb, Zn, Cu and the adsorbent material in ecological blanket are to heavy metal Cd, the adsorbance of Pb, Zn, Cu, experiment
Data are shown in Table 2:
Table 2
Claims (6)
1. a kind of method that ecological blanket of fixed heavy metal combines removal heavy metal-polluted soil with plant, this method includes following suitable
The step of sequence:
A) fixation in situ of heavy metal-polluted soil and absorption: ecological blanket is embedded in 15 under the topsoil of mild or moderate heavy metal pollution farmland
~ 20cm plants heavy metal over-accumulated plant on topsoil；In heavy metal over-accumulated plant growth course, lacked according to soil
The watering of regimen condition adjusts the 50%-70% that soil moisture content is field capacity；
B) removal of heavy metal-polluted soil: fixing and absorb by 60-180 days heavy metals, removes the ecology for having adsorbed heavy metal
Blanket, and harvest heavy metal over-accumulated plant overground part；
Wherein, the ecological blanket includes zeolite middle layer and inside and outside two layers permeable geotextiles for wrapping up zeolite middle layer；
Wherein, the zeolite in the zeolite middle layer is Na type-acid-heat treatment modified zeolite；
Wherein, the zeolite middle layer contains the insoluble phosphate compound for being vaccinated with microbial bacteria；
Na type-acid-heat treatment the modified zeolite the preparation method comprises the following steps: natural zeolite is added to 0.5-1 mol/L NaCl
In solution, 3-8 h is shaken in water-bath at 60-90 DEG C of constant temperature, and centrifuge separation is washed with deionized water；Zeolite after cleaning is added
Enter into 0.1-0.3 mol/L hydrochloric acid processing 12-48 h, is washed with deionized water to neutrality, 20-30 DEG C of constant temperature oscillation, after cleaning
Modified zeolite is dry；2-6 h is roasted at 420-480 DEG C, is cooled to room temperature, filters after being washed with deionized, after dry
Up to Na type-acid-heat treatment modified zeolite.
2. the method as described in claim 1, which is characterized in that the permeable geotextiles of internal layer are chopped fiber needle-punched non-woven using polypropylene
Geotextiles.
3. method according to claim 2, which is characterized in that the permeable geotextiles of outer layer use polyester filament geotextiles.
4. the method as described in claim 1, which is characterized in that the insoluble phosphate compound be hydroxyapatite or
Ground phosphate rock.
5. method as claimed in claim 4, which is characterized in that the microbial bacteria is phosphate solubilizing bacteria or acid and alkali-resistance microorganism
Bacterium.
6. the method as described in claim 1, which is characterized in that heavy metal over-accumulated plant described in step a) is the ecotype
Sedum alfredii Hance.
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| CN110192453A (en) * | 2019-06-19 | 2019-09-03 | 大连地拓环境科技有限公司 | A method of for Abandoned Land of Mine plant culture |
| CN115029287A (en) * | 2020-09-03 | 2022-09-09 | 中南大学 | Phosphate solubilizing bacterium agent and preparation method and application thereof |
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Denomination of invention: Removal of heavy metals from soil by ecological blanket and plants Effective date of registration: 20201022 Granted publication date: 20181225 Pledgee: China Co. truction Bank Corp Guangzhou Tianhe subbranch Pledgor: GUANGDONG DONGLEE ENVIRONMENT Co.,Ltd. Registration number: Y2020440000333 |