CN108144954A - A kind of ecological blanket of fixed heavy metal and its method for being combined removal heavy metal-polluted soil with phytoremediation - Google Patents
A kind of ecological blanket of fixed heavy metal and its method for being combined removal heavy metal-polluted soil with phytoremediation Download PDFInfo
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- CN108144954A CN108144954A CN201711405266.4A CN201711405266A CN108144954A CN 108144954 A CN108144954 A CN 108144954A CN 201711405266 A CN201711405266 A CN 201711405266A CN 108144954 A CN108144954 A CN 108144954A
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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 for being combined removal heavy metal-polluted soil with phytoremediation.The method for removing 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 wraps up inside and outside two layers permeable geotextiles of 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 be migrated 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 effective synergy of chemical fixation phytoremediation technology, to lead, zinc, the cadmium removal efficiency height in soil.
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
With the method that phytoremediation is combined removal heavy metal-polluted soil.
Background technology
Heavy metal pollution of soil has the characteristics that chronicity, hysteresis quality, cumulative bad, can enter food through a variety of ways
Chain is accumulated and amplification, and then threatens 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 worked out by being essential.
At present, 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, quantities is big, of 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
It absorbs, accumulate heavy metal element and after aerial part transhipment, by being gathered in plant, remove the heavy metal in soil.
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 as domestic and international hot research problem.Chemical fixation is by adding to contaminated soil
Add different modifying agents, by adsorbing, precipitating, complex reaction, heavy metal in soil is made mutually to be transferred to solid phase of soil by dissolving, is changed
Becoming heavy metal-polluted soil occurrence patterns, " passivation " its biological effectiveness prevents its biogenic migration or is transferred in water or atmospheric environment,
So as to achieve the effect that reduce bioavailability of heavy metals and toxicity.This method is with operation is flexible, cost is low, administers effect
The advantages that fruit is apparent, 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 as to adsorbing metal cation.
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 can be influenced the solidification effect of heavy metal by Soil Factors, such as soil
Moisture, pH, soil class, heavy metal type etc., when these factors change, cured heavy metal may reactivate out
Come or convert, so that secondary pollution.Phytoremediation has the shortcomings such as repair time is long, biomass is low, to heavy metal pollution
The repairing efficiency of soil is long, fails to be used widely.And chemical fixation is due to the weight being 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.At present, there is not the document report that the two combination reaches ideal effect temporarily.
And the present invention has creatively used a kind of method of ecological blanket, successfully by phytoremediation and chemical fixation knot
It has been closed that, by being wrapped up sorbing material by geotextiles and being placed in soil lower floor, avoided to super enriching plant Rhizosphere Soil
The passivation of heavy metal ion in earth will not inhibit absorption of the super enriching plant to 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 sorbing material uses a kind of spy
Very modified zeolitic material, greatly improves adsorption capacity of the ecological blanket to heavy metal-polluted soil.
Invention content
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 be effectively in fixing soil, and realize the combination of chemical fixation and phytoremediation, fast and effeciently go
Except heavy metal-polluted soil.
The present invention also aims to provide a kind of ecological blanket of fixed heavy metal and its be combined removal with phytoremediation
The method of heavy metal-polluted soil.
The present invention provides a kind of ecological blanket of fixed heavy metal, which is included 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 with intensity height, elongation percentage is low, ability of anti-deformation is strong, proportion 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, there is isolation, anti-filter etc., adapt 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 zeolites；Modified zeolite
There is stronger adsorption capacity to heavy metal ion；
Further, in some preferred embodiments, the preparation method of the modified zeolite is：
Natural zeolite is added in 0.5-1mol/L NaCl solutions, the water-bath concussion 3-8h at 60-90 DEG C of constant temperature, from
The heart detaches, and is washed with deionized water net；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 oscillation of constant temperature dries modified zeolite after cleaning；2-6h is roasted at 420-480 DEG C, is cooled down
It to room temperature, is filtered after being washed with deionized, up to Na type-acid-heat treatment modified zeolites after drying；
Further, in other preferred embodiments, the preparation method of the modified zeolite is：
Natural zeolite is added in 0.5~1mol/L NaCl solutions, the water-bath concussion 4-6h at 75-85 DEG C of constant temperature, from
The heart detaches, and is washed with deionized water net；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 oscillation of constant temperature dries 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 zeolites 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 fix heavy metal by absorption, metathesis, can also be under the action of microorganism
Slow mechanism dissolved forms phosphoric acid mineral deposits, while provide fertilizer efficiency for soil with heavy metal；
Further, the insoluble phosphate compound is for hydroxyapatite, ground phosphate rock etc., preferably with zeolite
Mass percent is 5~10% hydroxyapatite；
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 step of method of category, this method includes 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, heavy metal over-accumulated plant is planted on topsoil；In heavy metal over-accumulated plant growth course, according to soil
Earth water shortage situation is watered, and 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：It fixes and absorbs by the heavy metal of 60-180 days, 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 farmland heavy metal of heavy metal pollution described in step a) is lead, cadmium, zinc, one kind in copper or
It is several.
Preferably, the 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 repeats utilization：At 90-100 DEG C, with 1mol/L HCl and saturation NaCl
(volume 1:1) modified zeolite of heavy metal has been adsorbed in mixed liquid dipping washing, and cooling is washed 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 solve and directly inhibit asking for absorption of the over-accumulated plant to heavy metal using passivator
Topic, realizes effective synergy of chemical fixation-phytoremediation technology, to lead, zinc, the cadmium removal efficiency height in soil.
Beneficial effects of the present invention have：
(1) sorbing material is wrapped up using permeable geotextiles, neither influences sorbing material and the absorption of heavy metal-polluted soil is fixed,
Sorbing 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) sorbing material is wrapped up by geotextiles and is placed in soil lower floor, is avoided in super enriching plant rhizosphere soil
The passivation of heavy metal ion will not inhibit absorption of the super enriching plant to heavy metal, realize chemical fixation-phytoremediation skill
Effective synergy of art, to lead, zinc, the cadmium removal efficiency height in soil.
(3) method of modifying of the zeolite in sorbing material provided by the invention greatly improves existing modified zeolite counterweight
The adsorption capacity of metal ion.
(4) sorbing material provided by the invention using Na types-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
The present invention is explained further, but embodiment does not make the present invention any type of limit with reference to embodiments
It is fixed.
Embodiment 1
(1) preparation of middle layer zeolite：Natural zeolite is added in 0.5mol/L NaCl solutions, at 80 DEG C of constant temperature
5h is shaken in water-bath, centrifuges, and is washed with deionized water net；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, modified zeolite is put into baking oven, at 105 DEG C by 25 DEG C of oscillation 30min of 160rpm constant temperature after cleaning
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 types-acid-heat treatment modified zeolite of adsorptivity.
(2) preparation of ecological blanket 1：Two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles (are purchased from the western shellfish new material in Dezhou
Co., Ltd, product specification：SNGPP100 it) overlaps, (is purchased from Dongguan City Lian Rui nonwovens section with polyester filament spunbond geotextiles up and down
Skill Co., Ltd, article No.：LR1010-010 outer layer) is covered in, four layers of geotextiles edge are stitched together, middle layer filling step
(1) modified zeolite being prepared, is made the ecological blanket 1 with fixed heavy metal effect, 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 solutions, the water at 80 DEG C of constant temperature
Bath concussion 5h, centrifuges, and is washed with deionized water net；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 types-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 in outer layer, and four layers of geotextiles edge are stitched together, the modification that middle layer filling step (1) is prepared
Zeolite, is made the ecological blanket 2 with fixed heavy metal effect, 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 solutions, the water at 80 DEG C of constant temperature
Bath concussion 5h, centrifuges, and is washed with deionized water net；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 types-acid-heat treatment modified zeolite of adsorptivity.
(2) prepared by middle layer sorbing material：Phosphate solubilizing bacteria (being purchased from Guangdong Microbes Inst) is inoculated in hydroxy-apatite
Stone (purchased from upper object Science and Technology Ltd. of Haikang nangzan, No. CAS：1306-06-5, heavy metal：≤ 0.001%) it, is made with step (1)
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 sorbing material.
(3) prepared by ecological blanket 3：Two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles are overlapped, are spun up and down with polyester filament
Viscous geotextiles are covered in outer layer, and four layers of geotextiles edge are stitched together, the middle layer that middle layer filling step (2) is prepared
The ecological blanket 3 with fixed heavy metal effect is made in sorbing material, 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 solutions, the water at 80 DEG C of constant temperature
Bath concussion 5h, centrifuges, and is washed with deionized water net；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 types-acid-heat treatment modified zeolite of adsorptivity.
(2) prepared by middle layer sorbing material：Phosphate solubilizing bacteria (being purchased from Guangdong Microbes Inst) is inoculated in hydroxy-apatite
Stone (purchased from upper object Science and Technology Ltd. of Haikang nangzan, No. CAS：1306-06-5, heavy metal：≤ 0.001%) it, is made with step (1)
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 sorbing material.
(3) prepared by ecological blanket 4：Two layers of polypropylene synthetic staple fibers needling nonwoven geotextiles are overlapped, are spun up and down with polyester filament
Viscous geotextiles are covered in outer layer, and four layers of geotextiles edge are stitched together, the middle layer that middle layer filling step (2) is prepared
The ecological blanket 4 with fixed heavy metal effect is made in sorbing material, 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：8h will be handled at 90 DEG C of 3.0molL-1NaOH solution of natural zeolite, passed through
It is washed with water after cold filtration, modified zeolite is put into baking oven, the stronger modification of adsorptivity is obtained 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 solutions, the water at 80 DEG C of constant temperature
Bath concussion 5h, centrifuges, and is washed with deionized water net；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 after cleaning is put into baking oven, is done at 105 DEG C by 25 DEG C of oscillation 30min of 160rpm constant temperature
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 in outer layer, and four layers of geotextiles edge are stitched together, the modification that middle layer filling step (1) is prepared
Zeolite, is made the ecological blanket 6 with fixed heavy metal effect, 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 sizes prepared is layed in flowerpot bottom respectively, surface is covered
Covering the thick air-dried soil for crossing 5mm sieves 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).(plant spacing 5cm) will be grown in consistent Sedum alfredii Hance cuttage to basin, Sedum alfredii Hance is derived from Quzhou City of Zhejiang Province
An ancient Pb-Zn deposits.In growing process, moisture content of (deionized water) guarantee per basin soil that periodically water maintains
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 sorbing 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 new Jiang Zhen Shang Ba villages in Shaoguan City of Guangdong Province Wengyuan County
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 blankets prepared are layed in bottom surface, are 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 (Sedum alfredii Hance is derived from an ancient Pb-Zn deposits of Quzhou City of Zhejiang Province), the clip consistent southeast uniform in size during plantation
For red-spotted stonecrop overground part cuttage in soil, planting density is 10cm × 10cm.In growing process, periodically watering ensures
It is maintained per the moisture content of basin soil to 60% or so of field capacity.Sedum alfredii Hance is harvested after 3 months, heavy metal will be adsorbed
Modified zeolite ecological blanket taken out from soil, complete the removal of heavy metal in soil Cd, Pb, Zn, Cu.Measure Sedum alfredii Hance pair
Sorbing material in heavy metal Cd, the accumulation of Pb, Zn, Cu and ecological blanket is to heavy metal Cd, the adsorbance of Pb, Zn, Cu, experiment
Data are shown in Table 2：
Table 2
Claims (10)
1. a kind of ecological blanket of fixed heavy metal, which is characterized in that the ecological blanket is included among zeolite middle layer and package zeolite
Inside and outside two layers permeable geotextiles of layer.
2. ecological blanket as described in claim 1, which is characterized in that the internal layer geotextiles are chopped fiber needle-punched non-using polypropylene
Weave geotextiles.
3. ecological blanket as claimed in claim 1 or 2, which is characterized in that the outer layer geotextiles are using polyester filament geotechnique
Cloth.
4. ecological blanket as described in claim 1, which is characterized in that the zeolite in the zeolite middle layer is Na types-acid-heat
Handle modified zeolite.
5. ecological blanket as claimed in claim 4, which is characterized in that the preparation side of the Na type-acid-heat treatment modified zeolites
Method is：Natural zeolite is added in 0.5-1mol/L NaCl solutions, water-bath concussion 3-8h, centrifugation point at 60-90 DEG C of constant temperature
From being washed with deionized water net；Zeolite after cleaning is added in 0.1-0.3mol/L hydrochloric acid and handles 12-48h, uses deionized water
Neutrality is washed till, 20-30 DEG C of oscillation of constant temperature dries modified zeolite after cleaning；2-6h is roasted at 420-480 DEG C, is cooled to room
Temperature filters after being washed with deionized, up to Na type-acid-heat treatment modified zeolites after drying.
6. the ecological blanket as described in right 1, which is characterized in that the zeolite middle layer contains the indissoluble for being vaccinated with microbial bacteria
Acid phosphate compound.
7. ecological blanket as claimed in claim 6, which is characterized in that the insoluble phosphate compound is hydroxyapatite
Or ground phosphate rock.
8. ecological blanket as claimed in claims 6 or 7, which is characterized in that the microbial bacteria is micro- for phosphate solubilizing bacteria or acid and alkali-resistance
Biological bacteria.
9. a kind of ecological blanket of fixed heavy metal and its method for being combined removal heavy metal-polluted soil with phytoremediation, this method packet
The step of including following sequences：
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
Regimen condition is watered, and adjusts the 50%-70% that soil moisture content is field capacity；
B) removal of heavy metal-polluted soil：It fixes and absorbs by the heavy metal of 60-180 days, remove the ecology for having adsorbed heavy metal
Blanket, and harvest heavy metal over-accumulated plant overground part.
10. method as claimed in claim 9, which is characterized in that the heavy metal over-accumulated plant described in step a) is ecology
Type Sedum alfredii Hance.
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| CN109174957A (en) * | 2018-09-07 | 2019-01-11 | 湖南省农业环境生态研究所 | A kind of restorative procedure of heavy metal cadmium arable soil |
| CN109289810A (en) * | 2018-11-02 | 2019-02-01 | 山东海岱园林集团有限公司 | A kind of heavy metal ion adsorbed blanket and preparation method and the application in removal heavy metal-polluted soil |
| 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 |
| CN111979159A (en) * | 2020-09-03 | 2020-11-24 | 中南大学 | Phosphate solubilizing bacterium agent and preparation method and application thereof |
| CN114101303A (en) * | 2021-11-26 | 2022-03-01 | 清华大学 | Heavy metal polluted rice field repairing system and method |
| CN110192453B (en) * | 2019-06-19 | 2024-04-26 | 大连地拓环境科技有限公司 | Method for cultivating plants in mine abandoned land |
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| CN110192453B (en) * | 2019-06-19 | 2024-04-26 | 大连地拓环境科技有限公司 | Method for cultivating plants in mine abandoned land |
| CN111979159A (en) * | 2020-09-03 | 2020-11-24 | 中南大学 | Phosphate solubilizing bacterium agent and preparation method and application thereof |
| CN114101303A (en) * | 2021-11-26 | 2022-03-01 | 清华大学 | Heavy metal polluted rice field repairing system and method |
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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 |
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