CN110125161A - A kind of heavy metal soil-repairing agent and method cooperateing with compost based on magnesia-montmorillonite composite material - Google Patents
A kind of heavy metal soil-repairing agent and method cooperateing with compost based on magnesia-montmorillonite composite material Download PDFInfo
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- CN110125161A CN110125161A CN201910363335.2A CN201910363335A CN110125161A CN 110125161 A CN110125161 A CN 110125161A CN 201910363335 A CN201910363335 A CN 201910363335A CN 110125161 A CN110125161 A CN 110125161A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The present invention " a kind of based on magnesia-montmorillonite composite material collaboration compost heavy metal soil-repairing agent and method " belongs to heavy metal technical field of soil remediation.The heavy metal soil-repairing agent includes: magnesia-montmorillonite composite material and compost；The montmorillonite is layer structure；Magnesia-the montmorillonite composite material is MgO-Supported on the surface of montmorillonite and the material of interlayer.Renovation agent and restorative procedure of the invention can make heavy metal form stable chemical form, complete the reparation to heavy metal soil.This method has low cost, simple, efficient, advantages of environment protection, all has good repairing effect to single cadmium pollution and Compound Heavy Metals soil.
Description
Technical field
The invention belongs to heavy metal technical field of soil remediation, more particularly to one kind to be based on magnesia-montmorillonite composite wood
The heavy metal soil-repairing agent and method of material collaboration compost.
Background technique
According to " the national Soil Pollution Investigation bulletin " of the joint publication in 2014 of Environmental Protection in China portion and Ministry of Land and Resources
Show that national soil environment situation totally allows of no optimist, contaminated soil based on heavy metal, predominantly cadmium, mercury, arsenic, copper, lead,
Chromium, zinc, 8 heavy metal species of nickel.It is urgently to be solved great that heavy-metal contaminated soil repairing and treating has become current Environmental Protection in China field
One of problem.Recently as going deep into for research, that scientific circles recognize real influence soil risk is the effective of pollutant
State content, so being changed into reduction available state by completely removing heavy metal for heavy metal pollution of soil river harnessing ideas at present
The content of heavy metal.Therefore, soil available content of beary metal is reduced by passivator based technique for in-situ remediation with important
Meaning, and China's agricultural soil heavy metal pollution has the characteristics that larger area, based on mild or moderate pollution, in-situ passivation reparation
Technology is due to easy to operate, quick and suitable pollution in wide area is administered by extensive concern.
In-situ passivation technology because have the characteristics that easy to operate, small investment, due to be taken seriously, the passivation of common soil is repaired
Agent has lime, metal oxide, biological carbon, compost etc..But there is also shortcomings for these passivator, and lime meeting is such as used for a long time
It generates certain influence to the physical property of soil such as to agglomerate, whole fertility level can decline, and suction of the compost to heavy metal
Compost is constantly decomposed and is reduced attached, complexing as time goes by, may cause the variation of soil pH, so that heavy metal is again
Activation and release, cause secondary pollution.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide it is a kind of can be steady in a long-term in the soil
Ground play repair and will not because ingredient it is unstable caused by heavy metal the bring secondary pollution of release again, combine low
Cost, simple, efficient, environmental-friendly novel heavy metal soil-repairing agent and its restorative procedure.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of heavy metal soil-repairing agent cooperateing with compost based on magnesia-montmorillonite composite material, comprising: magnesia-
Montmorillonite composite material and compost；The montmorillonite is layer structure；Magnesia-the montmorillonite composite material is negative for magnesia
It is loaded in the surface of montmorillonite and the material of interlayer.
The compost is selected from urban sewage sludge compost, biomass compost, or, livestock excrement composting；Magnesia-the montmorillonite
The weight ratio of composite material and compost is 10%~40%: 90%-60%.
MgO-Supported amount in the magnesia-montmorillonite composite material is magnesia-montmorillonite 10~30%.
One heavy metal species soil remediation method, comprising: mixed using the heavy metal soil-repairing agent and heavy metal soil
It closes.
So that magnesia-montmorillonite composite material collaboration compost is reacted with the heavy metal in soil, forms heavy metal
Stable chemical form completes the reparation to heavy metal soil；Magnesia-the montmorillonite composite material is layer structure, institute
State surface and interlayer of the MgO-Supported in montmorillonite.
The heavy metal soil-repairing agent is 1wt~10wt% relative to the additive amount of heavy-metal contaminated soil.Additive amount
It is adjusted according to the content of beary metal height in soil.
Repair time is 60 days, and soil moisture content maintains the 50%~80% of maximum water-holding capacity during reparation.
The heavy metal is selected from cadmium, zinc, copper or lead.
The preparation method of the heavy metal soil-repairing agent, which is characterized in that by the magnesia-montmorillonite composite wood
Material is mixed with compost.
Magnesia-the montmorillonite composite material is made by following methods:
(1) by montmorillonite ultrasonic disperse into water, montmorillonite dispersion liquid is obtained；
(2) magnesium chloride is added in the resulting montmorillonite dispersion liquid of step (1), it is molten to adjust mixing with sodium hydroxide solution
Liquid pH to 10 aging 12 hours, is cleaned, precipitated product is obtained by filtration；
(3) step (2) resulting precipitated product is put into crucible, calcines 4 hours, takes in 400 degrees Celsius of Muffle furnaces
Product magnesia-montmorillonite is obtained after out.
A method of compost remediating heavy metal soil, including following step are cooperateed with using magnesia-montmorillonite composite material
It is rapid:
Magnesia-montmorillonite composite material collaboration compost is sufficiently mixed with heavy-metal contaminated soil, makes magnesia-Meng Tuo
Stone composite material collaboration compost reacts with the heavy metal in soil, and heavy metal is made to form stable chemical form, completion pair
The reparation of heavy metal soil；Magnesia-the montmorillonite composite material is layer structure, MgO-Supported to stratiform montmorillonite
Surface and interlayer.
Above-mentioned utilizes magnesia-montmorillonite composite material collaboration compost remediating heavy metal soil method, it is preferred that institute
It is 1wt~10wt% that magnesia-montmorillonite composite material collaboration compost, which is stated, relative to the additive amount of heavy-metal contaminated soil；It repairs
Time is 7~90 days.
Above-mentioned utilizes magnesia-montmorillonite composite material collaboration compost remediating heavy metal soil method, it is preferred that repairs
Soil moisture content is maintained the 50%~80% of maximum water-holding capacity during multiple.
Above-mentioned utilizes magnesia-montmorillonite composite material collaboration compost remediating heavy metal soil method, it is preferred that institute
Stating heavy metal includes cadmium, zinc, copper and lead.
Above-mentioned utilizes magnesia-montmorillonite composite material collaboration compost remediating heavy metal soil method, it is preferred that institute
Magnesia-montmorillonite composite material is stated to be made by following methods:
(1) by montmorillonite ultrasonic disperse into water, montmorillonite dispersion liquid is obtained；
(2) magnesium chloride is added in the resulting montmorillonite dispersion liquid of step (1), it is molten to adjust mixing with sodium hydroxide solution
Liquid pH to 10 aging 12 hours, is cleaned, precipitated product is obtained by filtration；
(3) step (2) resulting precipitated product is put into crucible, calcines 4 hours, takes in 400 degrees Celsius of Muffle furnaces
Product magnesia-montmorillonite is obtained after out.
Above-mentioned utilizes magnesia-montmorillonite composite material collaboration compost remediating heavy metal soil method, it is preferred that institute
Stating compost is the various compost for having stablizing effect to heavy metal, such as urban sewage sludge compost, biomass compost, livestock excrement composting
Deng.
Compared with the prior art, the advantages of the present invention are as follows:
1, the present invention repairs heavy metal soil using magnesia-montmorillonite composite material collaboration compost, the oxidation
Magnesium-montmorillonite composite material microstructure is layer structure, surface and interlayer of the MgO-Supported in montmorillonite, rather than simple
Mixing.It can be seen from magnesia-montmorillonite composite material infrared spectrogram compared with montmorillonite, in 3697cm-1Newly go out
Existing peak is magnesia-hydrogen bond stretching vibration peak, is illustrated on the montmorillonite of MgO-Supported, is connected in the form of hydrogen bond,
It is different from simple mixing.
2, magnesia-montmorillonite composite material other than with stronger heavy metal adsorption regulation ability, bury by application
It can also play the role of improving soil physico-chemical property after earth, such as improve soil pH value.
3, magnesia-montmorillonite composite material main component is silica, aluminium oxide, magnesia, is nontoxic, green
Color, low cost, environmental protection material, while montmorillonite is made of natural clay, will not be brought to soil environment after being exerted into soil
Toxic action.
4, compost has the double effects of the improvement soil such as heavy metal reparation and fertilizer conservation, getting fat, and the addition of compost reduces
It is administered alone magnesia-montmorillonite cost.
5, the present invention synthesizes magnesia-montmorillonite composite material using two-step synthesis method, uses intermediate processing, alkalinity first
Under the conditions of magnesium hydroxide load on montmorillonite, magnesium hydroxide is then transformed into magnesia in 400 degrees Celsius of calcinings, after calcining
The montmorillonite of supported magnesium oxide is bigger than the montmorillonite for loading magnesium hydroxide to the adsorption rate of heavy metal, while calcining also makes montmorillonite
Hole becomes larger, and specific surface area increases, and improves composite material to the absorption property of heavy metal.
6, the present invention is single with fixed function ratio of the modified clay magnesia-montmorillonite composite material collaboration compost to heavy metal
Solely addition magnesia-montmorillonite composite material and independent addition compost will be got well.
Thinking of the invention is, first by MgO-Supported to clay mineral montmorillonite, it is compound that magnesia-montmorillonite to be made
Then material uses the composition of magnesia-montmorillonite composite material and compost to carry out restoration of soil polluted by heavy metal as passivator,
The composition passivator is to the stablizing effect of heavy metal than magnesia-montmorillonite is administered alone and the effect of compost is administered alone all
It is better, while the use of compost also reduces cost.The present invention is using advanced composite material (ACM) for cooperateing with compost remediating heavy metal
Contaminated soil, such as using natural clay as templated synthesis nano material after, utilize the unique structural property of clay, the nanometer material of synthesis
Material has the characteristics that size is small, reactivity is strong, just has preferable repairing effect under low amount of application；Equally to natural clay
Material carries out intercalation, grafting or modified, enhances the adsorptivity to heavy metal, the reparation to heavy metal is enhanced after being manured into soil
Effect.Fixed heavy metal is complexed in compost when handling heavy-metal contaminated soil, when organic form changes, and makes heavy metal activity quilt
Passivation, biological effectiveness reduce, and the double effects with the improvement soil such as heavy metal reparation and fertilizer conservation, getting fat are added to novel
After composite material, the stability of compost in the soil can be significantly improved, so that compost is permanently effective to the fixed function of heavy metal.
Therefore, key of the method lies on montmorillonite supported magnesium oxide, develop more efficiently, environmental protection, low cost
Modified clay renovation agent, while the magnesia after load-montmorillonite collaboration compost composition is used as passivator, to enhance pair
The stabilization of heavy-metal contaminated soil.
Magnesia-montmorillonite composite material collaboration compost remediating heavy metal soil side is utilized the invention discloses a kind of
Method, comprising the following steps: magnesia-montmorillonite composite material collaboration compost is sufficiently mixed with heavy-metal contaminated soil, makes oxygen
Change magnesium-montmorillonite composite material collaboration compost to react with the heavy metal in soil, heavy metal is made to form stable chemical shape
State completes the reparation to heavy metal soil.This method has low cost, simple, efficient, advantages of environment protection, to single cadmium
Pollution and Compound Heavy Metals soil all have good repairing effect.
Detailed description of the invention
Fig. 1 is magnesia-montmorillonite composite material X-ray diffractogram that step (b) is prepared.
Fig. 2 is magnesia-montmorillonite composite material infrared absorpting light spectra that step (b) is prepared.
Fig. 3 is in soil after magnesia-montmorillonite composite material collaboration compost cadmium pollution soil repair of Different adding amount
TCLP extracts state cadmium content comparative diagram.
Fig. 4 is that magnesia-montmorillonite composite material of Different adding amount cooperates with soil pH after compost cadmium pollution soil repair
Value variation comparative diagram.
Fig. 5 is to test soil after the composition passivator of peromag-montmorillonite composite material collaboration compost is repaired not
With the cadmium content of form.
Fig. 6 is to apply easy exchange state content of beary metal in the soil after passivator is repaired.
Fig. 7 be plant roots in the soil for add passivator reparation, stem, in leaf each content of beary metal variation tendency.
Fig. 8 is that water extracts the content of state organic carbon with the increased situation of change of compost content.
Fig. 9 is the situation of change of urease activity in the soil for be added passivator.
Figure 10 is the situation of change of dehydrogenase activity in the soil for be added passivator.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
It limits the scope of the invention.
1st group of embodiment, heavy metal soil-repairing agent of the invention
This group of embodiment provides a kind of based on magnesia-montmorillonite composite material collaboration compost heavy metal soil remediation
Agent, comprising: magnesia-montmorillonite composite material and compost；The montmorillonite is layer structure；Magnesia-the montmorillonite is multiple
Condensation material is MgO-Supported on the surface of montmorillonite and the material of interlayer.
In a preferred embodiment, the compost is selected from urban sewage sludge compost, biomass compost, or, livestock excrement composting；
The weight ratio of the magnesia-montmorillonite composite material and compost is 10%~40%: 90%-60%.
In some embodiments, the MgO-Supported amount in the magnesia-montmorillonite composite material is magnesia-Meng Tuo
The 10~30% of stone.
2nd group of embodiment, heavy metal soil remediation method of the invention
This group of embodiment provides a heavy metal species soil remediation method, comprising: uses the heavy metal soil-repairing agent
It is mixed with heavy metal soil.
In the particular embodiment, the restorative procedure refers to, makes magnesia-montmorillonite composite material collaboration compost and soil
In heavy metal react, so that heavy metal is formed stable chemical form, complete the reparation to heavy metal soil；The oxidation
Magnesium-montmorillonite composite material is layer structure, surface and interlayer of the MgO-Supported in montmorillonite.
In a preferred embodiment, the heavy metal soil-repairing agent is relative to the additive amount of heavy-metal contaminated soil
1wt~10wt%.Additive amount is adjusted according to the content of beary metal height in soil.
In some embodiments, repair time is 60 days, and soil moisture content maintains maximum water-holding capacity during reparation
50%~80%.
In the particular embodiment, the heavy metal is selected from cadmium, zinc, copper or lead.
3rd group of embodiment, the preparation method of heavy metal soil-repairing agent of the invention
This group of embodiment provides the preparation method of the 1st group of described in any item heavy metal soil-repairing agents of embodiment, special
Sign is, the magnesia-montmorillonite composite material is mixed with compost.
In the particular embodiment, the magnesia-montmorillonite composite material is made by following methods:
(1) by montmorillonite ultrasonic disperse into water, montmorillonite dispersion liquid is obtained；
(2) magnesium chloride is added in the resulting montmorillonite dispersion liquid of step (1), it is molten to adjust mixing with sodium hydroxide solution
Liquid pH to 10 aging 12 hours, is cleaned, precipitated product is obtained by filtration；
(3) step (2) resulting precipitated product is put into crucible, calcines 4 hours, takes in 400 degrees Celsius of Muffle furnaces
Product magnesia-montmorillonite is obtained after out.
In a more specific embodiment, magnesia-montmorillonite composite material that the present invention uses, using following methods system
:
(a) 50g montmorillonite is added in 450ml deionized water, is ultrasonically treated 1h, obtains montmorillonite dispersion liquid；It will
108.75g magnesium chloride hexahydrate is dissolved in a certain amount of deionized water, is then transferred to montmorillonite dispersion liquid, and magnetic agitation 2h is mixed
Close liquid.2mol/LNaOH solution is added dropwise into mixed liquor, adjusts pH to 10, subsequent aging 12h, acquired solution is obtained by filtration solid
Body is washed with water three times, dries for 24 hours after centrifugation at 60 DEG C, obtains magnesium hydroxide-montmorillonite.
(b) obtained magnesium hydroxide-montmorillonite is transferred in crucible, is put into Muffle furnace, 4h is calcined at 400 DEG C, most
Product magnesia-montmorillonite is obtained eventually.
Fig. 1 is magnesia-montmorillonite composite material X-ray diffractogram obtained by step (b), as seen from the figure, compared to not
Modify montmorillonite as former state, magnesia-montmorillonite composite material XRD diagram has had more the diffraction maximum of a magnesia.Fig. 2 is gained
Magnesia-montmorillonite composite material infrared spectrogram, compared with montmorillonite, in 3697cm-1Locating emerging peak is magnesia-
The stretching vibration peak of hydrogen bond, illustrates on the montmorillonite of MgO-Supported, is connected in the form of hydrogen bond, is different from simple mixed
It closes.Experimental example 1
A kind of method of the invention for utilizing magnesia-montmorillonite composite material to cooperate with compost cadmium pollution soil repair, packet
Include following steps:
(1) cadmium pollution soil configures: method of the experiment soil collection from Agricultural University Of Hunan, by artificially adding cadmium solution
Prepare cadmium pollution soil, by the soil of cadmium pollution 25 DEG C constant temperature incubation two months, so that Cd fractionation is tended towards stability.Through inductive coupling
It is 2.55mg/kg that plasma emission spectrometer (ICP-OES), which measures cadmium content in soil,.Then carry out soil remediation experiment.
(2) cadmium pollution soil reparation: six groups of cadmium pollution soils with (1) the step of weight after stable are taken, are added into soil
The passivator for adding 3%wt, according to the difference of magnesia-montmorillonite and compost portfolio ratio in passivator, experiment is divided into blank, list
Only compost, group composition and division in a proportion 1:9, group composition and division in a proportion 2:8, group composition and division in a proportion 4:6, independent material group.Give 6 groups of cadmium pollution soils respectively with deionized water
It keeps the skin wet, cadmium pollution soil water tariff collection water is made to maintain 60% of its maximum field capacity or so.After stablizing 60 days,
The soil after repairing is taken, with the content of acid dissolution state cadmium in TCLP method measurement cadmium pollution soil, measures various not similar shapes with BCR method
The content of the cadmium of state in the soil, while measuring the pH value in soil.
The content results that TCLP extracts state cadmium are as shown in Figure 3.The fixed rate of cadmium is as shown in table 1
The fixed effect table of comparisons of 1 different proportion magnesia of table-montmorillonite and heap fertilizer composition to cadmium in soil
As seen from Figure 3, it adds the cadmium that TCLP extracts state in the soil of passivation renovation agent to significantly reduce, and extracts state
Cadmium content show different effects with the ratio of different magnesia-montmorillonites and compost, optimal material compost ratio is 2:
8, illustrate that magnesia-montmorillonite composite material collaboration compost can effectively reduce the bioavailability of the cadmium in soil, mitigates
Cadmium improves soil quality to animals and plants toxic action.As shown in table 1, when magnesia-montmorillonite is with compost group composition and division in a proportion 2:8, soil
The fixed rate of middle cadmium is 26.9%, is higher by 5.3% than individually adding compost, is higher by than individually adding magnesia-montmorillonite
13.7%, illustrate that magnesia-montmorillonite is added in conjunction with compost than individually adding magnesia-montmorillonite and individually adding compost effect all
It is better.
It as seen from Figure 4, is Acid soil, pH value 6.46 for the cadmium pollution soil of experiment.Individually addition heap
Fertilizer makes the pH value of soil be reduced to 5.75, is added in magnesia-montmorillonite soil, and pH value is improved, and with
Magnesia-montmorillonite additive amount increases and increases, and wherein pH is 7.71 in the soil of material compost ratio 4:6, only adds magnesia-
PH value is increased to 8.36 in the soil of montmorillonite.Illustrate that the pH value of soil, soil can be improved in magnesia-montmorillonite composite material
PH value, which must rise, is conducive to the fixation of heavy metal in the soil, so that the content of the heavy metal ion of part exchangeable species be made to drop
It is low.
The Form division of heavy metal is 4 kinds of forms by BCR method: acid dissolution state F1, can reduction-state F2, oxidable state F3 and residual
Slag state F4.F1 most easily can be discharged into environment to form free ion in these four forms, and environmental hazard is maximum, and F3 and F4 can be long-term
Stable is present in soil.Test soil is repaired through peromag-montmorillonite composite material collaboration compost composition passivator
After multiple, the cadmium content of different shape can be showed by Fig. 5.As seen from Figure 5, after being added to passivator, acid dissolution state
Heavy metal cadmium F1 content is reduced, and only adds compost, group composition and division in a proportion 1:9,2:8,4:6, added material group by blank control
59.14% be reduced to 51.67%, 50.42%, 48.85%, 53.24%, 47.76%, wherein material compost ratio 2:8
Only the experimental group of added material all shows preferable passivation effect.This may be to accelerate since compost itself is negatively charged
Absorption to heavy metal ion, simultaneous oxidation magnesium-montmorillonite make heavy metal precipitation get off to reach stable at alkalinity in aqueous solution
Effect.
Experimental example 2:
It is a kind of of the invention magnesia-montmorillonite composite material collaboration compost to be utilized to repair Compound Heavy Metals soil
Method, comprising the following steps:
(1) Compound Heavy Metals soil collection: experiment soil collection from Agricultural University Of Hunan, by artificially add copper,
Cadmium, lead, zinc solution method prepare Compound Heavy Metals soil, by Compound Heavy Metals soil in 25 DEG C of constant temperature incubations two
A month, Heavy Metals is made to tend towards stability.Through inductive coupling plasma emission spectrograph (ICP-OES) measurement soil in copper,
Cadmium, lead, zinc content be respectively 293.5mg/kg, 3.05mg/kg, 898mg/kg, 724mg/kg, it is real then to carry out soil remediation
It tests.
(2) Compound Heavy Metals soil remediation: the Compound Heavy Metals soil after being stablized with step (1) carries out basin
Experiment is planted, experiment is divided into 6 groups, and every group two parallel, amounts to 12 pottings.Concrete operations are as follows: in 1000 milliliters of potting
700 grams of heavy-metal contaminated soil is added, the passivator (21 grams) of 3%wt is added into soil, according to magnesia-in passivator
The difference of montmorillonite and compost portfolio ratio, experiment are divided into blank, independent compost, group composition and division in a proportion 1:9, group composition and division in a proportion 2:8, group composition and division in a proportion 4:
6, independent material group.After stablizing for 1 week, the water spinach seed of 4 grain germinations is added in each potting, is given respectively with deionized water
6 groups of contaminated soils keep the skin wet, and contaminated soil water tariff collection water is made to maintain 60% of its maximum field capacity or so.Surely
After 60 days fixed, water spinach is harvested, measures the content of different parts heavy metal in water spinach.The soil after repairing is taken, with TCLP method
Each heavy metal acid dissolution state content measures pH value, the activity of urase and dehydrogenase, water in soil simultaneously in measurement contaminated soil
Extract state organic carbon content.
Apply passivator repair after soil in easily exchange state content of beary metal as shown in fig. 6, TCLP extract state copper,
Cadmium, lead, zinc content added than with different magnesia-montmorillonites and compost and show different effects, and optimal combination
Than for 2:8.Illustrate that magnesia-montmorillonite collaboration compost can effectively fixation various heavy simultaneously.As shown in Table 2, it combines
When than 2:8, the repairing effect of copper is up to 43.4%, and the repairing effect of lead is 38.9%, and the repairing effect of zinc is also up to 9.7%.
Illustrate that the composition of magnesia-montmorillonite and compost can be applied to the reparation of Compound Heavy Metals soil, especially copper, lead
The soil of combined pollution；And the combination addition of magnesia-montmorillonite and compost will than the repairing effect individually added of the two
It is good.The fixed rate of each heavy metal is as shown in table 2
Different magnesia-the montmorillonites of table 2 and compost ratio compare the fixed effect of heavy metal in composite soil after repairing
Table
After adding passivator into heavy-metal contaminated soil, heavy metal is converted into stable state by state easy to migrate, and biology can benefit
It is reduced with property, plant in-vivo heavy metal content can be reduced.In water spinach potted plant experiment, compared with blank control, addition passivation
In the soil of agent reparation, plant roots, stem, each content of beary metal significantly decreases trend in leaf, as shown in Figure 7.With compound
For Cadium In Polluted Soil content, passivator group composition and division in a proportion 1:9 experimental group entirety repairing effect is best, compared with blank control, root,
Cadmium content reduces 67.3%, 83.4%, 92.5% respectively in stem, leaf.
Water extracts state organic carbon content in soil and the content of exchange state heavy metal is closely related, and water extracts state organic carbon and contains
It measures more high more is conducive to heavy metal passivation, because the raising that water extracts state organic carbon promotes the network of free ion and organic ligand
It closes.As shown, the soil of addition passivator, relative to blank soil, water extracts state organic carbon content and significantly improves, this may
It is to contain largely to have matrix due to compost, with the increase of compost content, the content that water extracts state organic carbon is increased.Such as Fig. 8
It is shown, independent compost, group composition and division in a proportion 1:9,2:8,4:6, independent material group water extract state organic carbon content be respectively 277.1,
312.0,599.6,371.9,291.8mg/kg, increase 31.6% respectively than blank control, 48.2%, 184.8%,
76.7%, 38.6%.But be not compost content it is higher, water extract state organic carbon content it is higher, material oxidation magnesium-montmorillonite
Reaction is produced between compost, in the soil of material compost ratio 2:8 experimental group, water extracts state organic carbon content highest.
Heavy metal in soil can influence enzymatic activity, and heavy metal is since heavy metal and enzyme or enzyme are made to the inhibiting effect of enzyme activity
Compound is formed with matrix, also or in conjunction with the activated protein group of enzyme reduces enzyme activity, so the variation of enzymatic activity becomes
Gesture can be used as the indicator reaction of heavy metal pollution degree.
As shown in Figure 9, be added in the soil of passivator, urease activity is significantly raised, independent compost, group composition and division in a proportion 1:9,2:8,
4:6, independent material group urease activity are respectively 0.69,1.62,1.71,1.67,1.09mg NH3-N g-1Soil for 24 hours, distinguishes
19.0%, 179.3%, 194.8%, 187.9%, 87.9% is increased than blank control experimental group.It can be seen that individually
Addition compost adds the raising of urease activity not as good as independent added material magnesia-montmorillonite and material collaboration compost jointly
Effect is good.As shown in Figure 10, it is added in the soil of passivator, the activity of dehydrogenase is also raised more, independent compost, group composition and division in a proportion
1:9,2:8,4:6, independent material group dehydrogenase activity are respectively 14.2,32.7,41,38.1,33.8 μ g TFP g-1soil
For 24 hours, 5.2%, 142.2%, 203.7%, 182.2%, 150.4% is improved than blank control respectively.By the above urase and take off
The activity of hydrogen enzyme, which can be seen that addition heavy metal deactivator, improves soil enzymatic activities, improves soil quality.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example.All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It is noted that for the art
Those of ordinary skill for, improvements and modifications without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of based on magnesia-montmorillonite composite material collaboration compost heavy metal soil-repairing agent, comprising: magnesia-illiteracy
De- stone composite material and compost；The montmorillonite is layer structure；Magnesia-the montmorillonite composite material is MgO-Supported
In the surface of montmorillonite and the material of interlayer.
2. heavy metal soil-repairing agent according to claim 1, the compost is selected from urban sewage sludge compost, pile of biomass
Fertilizer, or, livestock excrement composting；The weight ratio of the magnesia-montmorillonite composite material and compost is 10%~40%:
90%-60%.
Oxygen 3. heavy metal soil-repairing agent according to claim 1 or 2, in the magnesia-montmorillonite composite material
Changing magnesium-supported amount is magnesia-montmorillonite 10~30%.
4. a heavy metal species soil remediation method, comprising: using any heavy metal soil-repairing agent of claim 1-3 with
The mixing of heavy metal soil；
So that magnesia-montmorillonite composite material collaboration compost is reacted with the heavy metal in soil, heavy metal is made to form stabilization
Chemical form, complete reparation to heavy metal soil；Magnesia-the montmorillonite composite material is layer structure, the oxygen
Change the magnesium-supported surface in montmorillonite and interlayer.
5. heavy metal soil remediation method according to claim 4, which is characterized in that the heavy metal soil-repairing agent phase
Additive amount for heavy-metal contaminated soil is 1wt~10wt%.Additive amount is adjusted according to the content of beary metal height in soil
It is whole.
6. heavy metal soil remediation method according to claim 1, which is characterized in that repair time is 60 days, repairs the phase
Between soil moisture content maintain the 50%~80% of maximum water-holding capacity.
7. heavy metal soil remediation method according to claim 1, which is characterized in that the heavy metal be selected from cadmium, zinc,
Copper or lead.
8. the preparation method of any heavy metal soil-repairing agent of claim 1-3, which is characterized in that by the oxidation
Magnesium-montmorillonite composite material is mixed with compost.
9. preparation method according to claim 8, the magnesia-montmorillonite composite material is made by following methods:
(1) by montmorillonite ultrasonic disperse into water, montmorillonite dispersion liquid is obtained；
(2) magnesium chloride is added in the resulting montmorillonite dispersion liquid of step (1), adjusts mixed solution pH with sodium hydroxide solution
To 10, aging 12 hours, cleans, precipitated product is obtained by filtration；
(3) step (2) resulting precipitated product is put into crucible, is calcined 4 hours in 400 degrees Celsius of Muffle furnaces, after taking-up
Obtain product magnesia-montmorillonite.
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| CN116355615A (en) * | 2023-04-04 | 2023-06-30 | 黄河水利委员会黄河水利科学研究院 | Heavy metal passivator of muscovite-based supported magnesium and preparation method and application thereof |
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| CN116355615A (en) * | 2023-04-04 | 2023-06-30 | 黄河水利委员会黄河水利科学研究院 | Heavy metal passivator of muscovite-based supported magnesium and preparation method and application thereof |
| CN116355615B (en) * | 2023-04-04 | 2024-02-02 | 黄河水利委员会黄河水利科学研究院 | Heavy metal passivator of muscovite-based supported magnesium and preparation method and application thereof |
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Application publication date: 20190816 |