CN107090297A - A kind of heavy metal polluted soil of farmland renovation agent and its preparation method and application - Google Patents
A kind of heavy metal polluted soil of farmland renovation agent and its preparation method and application Download PDFInfo
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- CN107090297A CN107090297A CN201710263156.2A CN201710263156A CN107090297A CN 107090297 A CN107090297 A CN 107090297A CN 201710263156 A CN201710263156 A CN 201710263156A CN 107090297 A CN107090297 A CN 107090297A
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
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- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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Abstract
The invention discloses a kind of heavy metal polluted soil of farmland renovation agent and its preparation method and application; the components such as water purifier active carbon filter element powder, discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer are discarded including clay mineral powder; its preparation method is to be dispersed in water discarded water purifier active carbon filter element powder and clay mineral powder; adjust pH to 2~5; it is transferred in hydrothermal reaction kettle; hydro-thermal reaction is carried out, hydro-thermal reaction product is placed under protective atmosphere and calcined；Calcined product is mixed with discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer, is produced.Soil-repairing agent stability is good, can fix free heavy metal ion in heavy metal polluted soil of farmland with efficient absorption, reduce crop heavy metal content, original ecological environment and soil texture are not destroyed, is increase soil fertility, increase crop yield.
Description
Technical field
The present invention relates to a kind of soil-repairing agent, more particularly to a kind of renovation agent for heavy metal polluted soil of farmland and
Its preparation method and application, belong to remediation of heavy metal-contaminated soil.
Background technology
Heavy metal pollution of soil refers to, because the activity of the mankind brings heavy metal in soil into, cause heavy metal in soil to contain
Amount is apparently higher than its Natural Background Values, and the phenomenon for causing ecological disruption and environmental quality to deteriorate.With population rapid growth, work
Industry scale of agricultural production constantly expands, and the situation of heavy metal pollution of soil is more and more severeer, increasingly protrudes the problem of initiation,
The serious environmental problem faced as the whole world.Heavy metal pollution does not only result in soil physics, chemistry and biology property
Change, reduce the yield and quality of crops, and human body can be reached by food chain, be directly detrimental to health.
The arable land heavy metal pollution of China is very serious, had 10,000,000 hectares by the arable land of heavy metal pollution, accounts for 1,800,000,000 mu of arable land
More than 8%, about 10,000,000,000 kilograms of grain yield is directly reduced every year.
In recent years, the heavy metal pollution problem of long term accumulation starts gradually to reveal, and in situation occurred frequently, subregion
Heavy metal pollution is especially prominent, only 2008, and China just there occurs Dushan, guizhou county, Hunan Chenxi County, Guangxi Hechi, cloud in succession
5 great heavy metal pollution events such as Nanyang ancestor sea and Henan Dasha River.These great heavy metal pollution events take place frequently, and not only make
Into serious economic loss, the life security of the mankind is also directly threatened.In the heavy metal pollution of soil situation of current rigorous
Under, each side experts and scholars' heavy metal contaminated soil remediation such as environmental protection, material, metallurgy expands research.
Traditional heavy-metal contaminated soil Treatment process has chemical leaching method, in-situ solidifying method and phytoremediation etc., this
A little methods respectively have respective merits and demerits.
Chemical leaching method carries out the heavy metal in elution removal soil using chemical agent to soil.The pouring that this method is used
Lotion can destroy the physicochemical property and original structure of soil, and the soil after elution loses plantation function substantially.What is eluted is useless
Liquid needs processing, and easily causes secondary pollution, and engineering cost is high.As Chinese patent CN201410800281.9 discloses one kind
The method that original position elution combination curing-stabilisation repairs chromium serious pollution soil, this method is exceeded for repairing chromium content
The soil of 900mg/kg chromium serious pollution, first carries out elution in situ using water as eluent to the soil of chromium serious pollution, then
Addition stabilizer and curing agent in soil after eluting in the original location, obtain detecting the rehabilitating soil that chromium concn is less than 160mg/kg.
This method is good to chromium serious pollution soil remediation effect, and chromium residues amount is low, reaches《Standard of soil environment quality》Secondary standard, but
It is that it can produce substantial amounts of ring waste.And it is scrubbed after soil physico-chemical property and original structure it is destroyed, it is basic to lose
Plant function.
In-situ solidifying method is to add soil to reduce the activity of heavy metal in soil by curing agent.This method uses simply logical
The activity that the effect such as absorption, chelating temporarily reduces heavy metal is crossed, but heavy metal is still remained in soil.And solidification method is effective
Property the problem of be also very big, when hardening time is longer or surrounding enviroment change, heavy metal it is possible to discharge again
Out.A kind of heavy-metal contaminated soil reparation curing agent is disclosed such as Chinese patent CN201210383318.3, it is heavy metal-polluted
Contaminate soil remediation method；The components such as composition and quick lime of the curing agent comprising sulphate aluminium cement and active silica, should
Curing agent can reach the purpose of curing heavy metal, reduce the Leaching of heavy metal, but the method for curing heavy metal, mesh
It is preceding to prove the long-term effectiveness of this method without reliable data, and solidfied material belongs to solid refuse, floor space it is big, it is necessary to
Filled, labor intensive and financial resources, and the soil after landfill can not carry out planting plants.
Phytoremediation is often referred to be planted on contaminated land using super enriching plant, with exceeded in plant absorption soil
Heavy metal.The problem of this method, is that repairing efficiency is very long, and it is larger that the economic loss caused is thrown something aside in soil.And it is enriched heavy metal
Plant need be collected processing, quantities is larger, in processing procedure easily generation secondary pollution.Chinese patent CN
201610708833.2 disclose a kind of method for making restoration of soil polluted by heavy metal between utilization herbaceous plant, and it is to plant draft
Species are implanted in heavy metal ion contaminated soil, and herbaceous plant is four kinds of water spinach, MAZHIXIAN, sludge knotweed and bitter dish with a work
Mode is planted in heavy metal ion contaminated soil, is selected by the super accumulation of four kinds of different herbaceous plant heavy metal ions
Property absorb, the heavy metal ion in soil is transferred to the aerial part of plant, periodically removes aboveground vegetation part, gradually reduces
The content of Heavy Metals in Contaminated Soils ion, and then the soil of repairing heavy metal pollution, but the plant of its enriching heavy metal needs
To handle in time, easily cause secondary pollution, and quantities is big, it is less efficient.
For the crops soil of heavy metal pollution, the method such as elution method of traditional remediating heavy metal soil pollution and solid
Change method etc. typically can all destroy the original structure of soil, it is impossible to be planted, and the herbaceous plant remediation efficiency low cycle is long, all very
Hardly possible adapts to the reparation of heavy metal pollution crops soil.And most straightforward approach is by adding heavy metal absorbent or stably
Agent, prevents heavy metal from entering in plant.Chitosan is compounded into upper lentinan as Chinese patent 201310200934.5 is disclosed,
The harmful heavy metal of harmful heavy metal, the especially exchangeable species such as chromium, cadmium in soil can be optionally adsorbed, and it is basic
The Zn content in soil is not influenceed, the zinc fertilizer power of soil is kept, and the farmland for the plants such as plantation tea tree that are particularly suitable for use in is used.But
Its adsorbent used is easy to degraded, and failure is fast.
The content of the invention
The defect existed for the crops soil restoring technology of existing heavy metal pollution, it is an object of the invention to
It is to provide a kind of stability good, free heavy metal ion in heavy metal polluted soil of farmland, reduction can be fixed with efficient absorption
Crop heavy metal content, original ecological environment and soil texture are not destroyed, is increase soil fertility, and increase repairing for crop yield
Multiple agent.
Another object of the present invention is to be to provide a kind of simple to operate, cost low preparation heavy metals in farmland Polluted Soil
The method of earth renovation agent.
Third object of the present invention is to be to provide the soil-repairing agent in repairing heavy metal polluted soil of farmland
Application, stability is good, and the soil-repairing agent not only effectively can realize reduction crops by repairing heavy metal polluted soil of farmland
Content of beary metal, and can increase soil fertility, increase crop yield.
The invention provides a kind of heavy metal polluted soil of farmland renovation agent, it includes following content of component raw material：It is viscous
Native 100 parts of mineral dust；Discarded 5~25 parts of water purifier active carbon filter element powder；Discarded water purifier fiber ultrafiltration membrane powder 1~10
Part；0.5~1.5 part of pH adjusting agent；1~10 part of organic fertilizer.
Water purifier of the prior art is almost the indispensable product in every household, and the filtering material service life such as filter element of water purifier
It is all relatively short, it is typically all directly to discard after life termination, is seldom reused.And technical solution of the present invention first will be useless
Active carbon filter core and fiber ultrafiltration membrane for abandoning in water purifier etc. are recycled, and are dexterously used heavy metals in farmland pollution
Soil restoring technology, both are applied in combination with clay mineral, organic fertilizer etc., can be selected well in absorption fixing soil
Heavy metal ion, while do not destroy the original structure of soil, and there is the effect of increase fertilizer efficiency to soil.The activity of water purifier
Carbon filtration core is usually to be formed with coconut husk charcoal and coal mass active carbon by bonding, and it not only possesses especially flourishing hole, compares surface
Up to 1000m2/ g, but also containing abundant hydroxyl, carboxyl etc., integrate absorption, filtering, intercepting and capturing, catalytic action, net
Organic matter, chlorine residue and other radioactive substances that can be effectively gone when being used in hydrophone in water removal etc..The milipore filter of fiber ultrafiltration membrane
It there are about up to 6,000,000,000 0.01 micron of micropore on fiber tube wall, its aperture only allows beneficial mineral matter in hydrone, water and micro-
Secondary element passes through, and the volume of smallest bacteria is all more than 0.02 micron, be used in water purifier can retain bacterium and
Colloid, iron rust, suspension, silt, larger molecular organicses etc..And clay mineral has larger ion exchange, its is larger
Specific surface area.To be combined in technical solution of the present invention together with active carbon filter core and fiber ultrafiltration membrane and clay mineral etc. makes
With, synergistic function is produced between each component, fiber ultrafiltration membrane makes full use of its bigger serface and nano-pore structure, make weight
Free heavy metal ion in metallic pollution soil selectively enters soil-repairing agent, and activated carbon utilizes its hole and polar group
Group's heavy metal ion carries out physical absorption and chemical bond chelating, and clay mineral heavy metal ion is swapped, and is realized
Immobilization, the stabilisation of heavy metal ion, and discharge for example nitrogenous ion component favourable to plant growth, phosphorus, potassium, calcium, magnesium etc.
Ion；When the heavy metal ion to soil is adsorbed, exchanged, original soil texture and ecology are not destroyed substantially, while can
Slowly to discharge organic fertilizer composition, soil fertility can effectively improve.
It is preferred that scheme, the clay mineral powder be sepiolite powder, bentonite powder, dolomite powder, zeolite powder
At least one of end；More preferably sepiolite.Clay mineral powder also serves as heavy metal simultaneously as the support materials of activated carbon
Absorption and exchange material, sepiolite possesses high-ratio surface, and shrinkage factor is low, and plasticity is good, bigger than surface, and adsorptivity is strong, is excellent
The carrier material of choosing.Clay mineral crosses 80 mesh sieves, extracting screen underflow by dry, pulverize.Crushing process, which is generally, to be ground.
It is preferred that scheme, the discarded water purifier active carbon filter element powder by discard water purifier in active carbon filter core pass through
150 mesh sieves are crushed and cross to obtain.The property carbon filtration core include preposition granular activated carbon filter core, preposition extruded activated carbon filter core, after
Put at least one of activated carbon T33 filter cores.The discarded water purifier active carbon filter element crosses 150 mesh sieves after drying, crushing,
Extracting screen underflow.Crushing process, which is generally, to be ground.
It is preferred that scheme, the discarded water purifier fiber ultrafiltration membrane powder by discard water purifier in fiber ultrafiltration membrane pass through
150 mesh sieves are crushed and cross to obtain.The conventional discarded water purifier fiber ultrafiltration membrane of in the market it is general by cellulose derivative, polysulfones,
The materials such as polyacrylonitrile, polyamide and makrolon are constituted.
It is preferred that scheme, described pH value regulator is calcium oxide and/or calcium superphosphate.Acid soil, typically using oxygen
Change calcium, basic soil typically uses calcium phosphate, and both can flexibly be used with combination collocation.
More preferably scheme, by legume and stalk mixture, compost is obtained the organic fertilizer after crushed.The beans
Section plant is at least one of butch clover, safflower locust tree, Lespedeza floribunda.
More preferably scheme, heavy metal polluted soil of farmland renovation agent is by following content of component raw material：Sepiolite powder
100 parts；Discarded 8~18 parts of water purifier active carbon filter element powder；Discarded 5~10 parts of water purifier fiber ultrafiltration membrane powder；PH is adjusted
0.8~1.2 part of agent；5~8 parts of organic fertilizer.
Present invention also offers a kind of preparation method of heavy metal polluted soil of farmland renovation agent, comprise the following steps：
1) discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, pH is to 2~5 for regulation, turns
Enter in hydrothermal reaction kettle, hydro-thermal reaction is carried out at a temperature of 120~150 DEG C；
2) hydro-thermal reaction product is placed under protective atmosphere, in 400~600 DEG C of temperature lower calcinations；
3) calcined product is mixed with discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer, is produced.
Technical scheme is by discarded water purifier active carbon filter element powder and clay mineral powder in solutions of weak acidity
Lower carry out hydro-thermal reaction, on the one hand can be in discarded water purifier active carbon filter element powder and clay mineral under acid condition of high voltage
The organic impurities of absorption is decomposed and Metal ion release, and on the other hand the crystal structure of clay mineral can be improved, and is improved
Its specific surface area, increases its absorption property, in hydrothermal reaction process, and absorbent charcoal material can be effectively combined with clay mineral, living
Property Carbon Materials are supported in clay mineral surface and hole, then by high-temperature calcination, activated carbon and clay mineral can be made further
Activation.Calcined product and discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer etc. carry out physical mixed, that is, obtain
Efficient soil-repairing agent.
It is preferred that scheme, time of the hydro-thermal reaction is 10~20h.
It is preferred that scheme, time of the calcining is 2~6h.
First heated-air drying is either dried in vacuo the hydro-thermal reaction product of the present invention at a temperature of 100~120 DEG C.
Present invention regulation pH acid can be inorganic acid conventional in the prior art.Such as sulfuric acid, nicotinic acid is all adapted to.
Present invention also offers a kind of application of heavy metal polluted soil of farmland renovation agent, it is applied to heavy metals in farmland
Contaminated soil remediation, to reduce crop heavy metal content and increasing crop yield.
It is preferred that scheme, by the renovation agent by 150~250kg/ mu addition in heavy-metal contaminated soil, holding soil
Moisture content is realized the purification of the heavy metal ion in heavy metal polluted soil of farmland and increase soil fertility more than 25%.
The heavy metal polluted soil of farmland of the present invention is according to its different heavy metal pollution degree of pollution sources and heavy metal species
Also different, such as highway, railway both sides agricultural land soil generally refers to lead, zinc, cadmium, chromium and copper heavy metal pollution.Apply chemical fertilizer
Agricultural chemicals and it can cause the metallic pollutions such as agricultural land soil lead, mercury, cadmium, arsenic using plastic sheeting etc..And it is dirty by municipal sewage, chemical industry
The pollution that water etc. and application sludge manure introduce agricultural land soil is mainly the heavy metal pollutions such as cadmium, lead, mercury, nickel, copper, chromium, zinc.This
The heavy metal polluted soil of farmland renovation agent of invention is adapted to for the reparation of the agricultural land soil of various heavy metal pollutions.Come at present
Say, be absorbed into grain by crops, most prominent mainly cadmium is exceeded.
Compared with the prior art, the advantageous effects that technical scheme is brought：
1) heavy metal polluted soil of farmland renovation agent of the invention utilizes discarded water purifier active carbon filter element and discarded water purification
Device fiber ultrafiltration membrane realizes refuse reclamation as primary raw material, greatlys save heavy metal polluted soil of farmland renovation agent
Use cost.
2) heavy metal polluted soil of farmland renovation agent of the invention can not only make to dissociate in heavy metal polluted soil of farmland
Heavy metal ion obtains efficient absorption, fixation, effectively reduction heavy metal enter crops, and do not destroy original ecological environment and
Soil texture, while can increase soil fertility, to increase crop yield.
3) preparation method of heavy metal polluted soil of farmland renovation agent of the invention is simple, cost is low, meets industrial production
It is required that.
4) heavy metal polluted soil of farmland renovation agent of the invention can be with conditions of it need not interrupt proportion of crop planting
Directly addition is used, and can not only reduce content of beary metal in crops, and can increase production.
Embodiment
Following examples are intended to further illustrate present invention, rather than limit the protection model of the claims in the present invention
Enclose.
Embodiment 1
In formula as below 1~6,
Clay mineral is ground by 105 DEG C of dryings, crosses 80 mesh sieves, extracting screen underflow.
Discarded water purifier active carbon filter element crosses 150 mesh sieves, extracting screen underflow after 105 DEG C of dryings, crushing.
Fiber ultrafiltration membrane in discarded water purifier grinds through overpickling, washing, then 105 DEG C of dryings, crosses 150 mesh sieves,
Extracting screen underflow.
Organic fertilizer is by butch clover and rice straw in mass ratio 1:1 mixture, after crushed, compost is obtained.
Formula 1：100 parts of bentonite powder, preposition 5 parts of granular activated carbon filter core powder discards water purifier fiber ultrafiltration membrane
5 parts of powder, 0.5 part of calcium oxide, 5 parts of organic fertilizer.
Formula 2：100 parts of zeolite powder, 25 parts of post active carbon T33 filter cores powder discards water purifier fiber ultrafiltration membrane powder
10 parts of end, 1.5 parts of calcium oxide, 10 parts of organic fertilizer.
Formula 3：100 parts of sepiolite powder, preposition 8 parts of granular activated carbon filter core powder discards water purifier fiber ultrafiltration membrane
8 parts of powder, 1.2 parts of calcium oxide, 7 parts of organic fertilizer.
Formula 4：100 parts of sepiolite powder, preposition 18 parts of granular activated carbon filter core powder discards water purifier fiber ultrafiltration membrane
9 parts of powder, 0.8 part of calcium oxide, 5 parts of organic fertilizer.
Formula 5：100 parts of sepiolite powder, preposition 8 parts of granular activated carbon filter core powder, 0.8~1.2 part of calcium oxide is organic
5 parts of fertilizer.
Formula 6：100 parts of sepiolite powder, discards 10 parts of water purifier fiber ultrafiltration membrane powder, 1.2 parts of calcium oxide, organic fertilizer
8 parts.
1~6 method of clicking of formula prepares soil-repairing agent above：
Discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, liquid-solid ratio is 1:5g/mL, is adopted
With sulfuric acid regulation solution system pH to 3, then it is transferred in hydrothermal reaction kettle, hydro-thermal reaction 15h, warp is carried out at a temperature of 140 DEG C
It is separated by filtration, solid product is after massive laundering, and the heated-air drying at a temperature of 110 DEG C, desciccate is placed in nitrogen atmosphere
Under, in 500 DEG C of temperature lower calcination 3h, calcined product and discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer machine
Tool stirring mixing, produces soil-repairing agent.
The field plot application test of 1~6 soil-repairing agent is formulated above：
1) take Hunan county polluted farmland soil as experimental plot, carry out field plot trial：Cadmium content in soil is
0.80mg/kg。
The experimental plot is divided into 28 experimental plots, totally 7 processing, each processing do 4 it is parallel, wherein with one
Reason is as the control group without soil-repairing agent, and formula 1~6 carries out a processing.Plot area 5m × 6m, random row
Row.During on-test, experimental plot does not first apply any fertilizer, and Tagayasu Den is raked, and carries out single single filling, prevents minizone string fertilizer string
Water.Application soil-repairing agent will each be handled into corresponding cell, soil-repairing agent addition is 200kg/ mus and manually uses six
Soil-repairing agent is uniformly blended into mud and scalds plate pressing field with wood by tooth harrow.After soil-repairing agent addition, keep soil enough
Humidity, water content is at least more than 30%, after conserving 3 days, carries out rice transplanting, per 4~5 plants of Basic Seedlings of the root and stem of certain plants.Carried out by normal method
Field management, until rice harvesting, obtains the content of beary metal composition such as table 1 below of rice grain, the harvest amount such as table 1 of paddy rice.
Content of beary metal and harvest during the paddy rice of table 1 is young
Embodiment 2
Formula 3：100 parts of sepiolite powder, preposition 8 parts of granular activated carbon filter core powder discards water purifier fiber ultrafiltration membrane
8 parts of powder, 1.2 parts of calcium oxide, 7 parts of organic fertilizer.
Formula 3 prepares soil-repairing agent above：
A：Discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, liquid-solid ratio is 1:5g/mL,
Using sulfuric acid regulation solution system pH to 5, then it is transferred in hydrothermal reaction kettle, hydro-thermal reaction 15h is carried out at a temperature of 120 DEG C,
By being separated by filtration, solid product is after massive laundering, and the heated-air drying at a temperature of 110 DEG C, desciccate is placed in nitrogen gas
Under atmosphere, in 600 DEG C of temperature lower calcination 2h, calcined product and discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer
Mechanical agitation is mixed, and produces soil-repairing agent A.
B：Discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, liquid-solid ratio is 1:5g/mL,
Then it is transferred in hydrothermal reaction kettle, hydro-thermal reaction 15h is carried out at a temperature of 140 DEG C, by being separated by filtration, solid product is through excessive
After amount washing, the heated-air drying at a temperature of 110 DEG C, desciccate is placed under nitrogen atmosphere, in 500 DEG C of temperature lower calcination 3h, is forged
Burn product to mix with discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer mechanical agitation, produce soil-repairing agent
B。
C：Discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, liquid-solid ratio is 1:5g/mL,
Using sulfuric acid regulation solution system pH to 3, then it is transferred in hydrothermal reaction kettle, hydro-thermal reaction 15h is carried out at a temperature of 140 DEG C,
By being separated by filtration, solid product is after massive laundering, and the heated-air drying at a temperature of 110 DEG C, desciccate is placed in nitrogen gas
Under atmosphere, in 1000 DEG C of temperature lower calcination 3h, calcined product and discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer
Mechanical agitation is mixed, and produces soil-repairing agent C.
D：Discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, liquid-solid ratio is 1:5, use
Sodium hydrate regulator solution system pH to 9, is then transferred in hydrothermal reaction kettle, and hydro-thermal reaction 15h is carried out at a temperature of 140 DEG C,
By being separated by filtration, solid product is after massive laundering, and the heated-air drying at a temperature of 110 DEG C, desciccate is placed in nitrogen gas
Under atmosphere, in 500 DEG C of temperature lower calcination 3h, calcined product and discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer
Mechanical agitation is mixed, and produces soil-repairing agent D.
The crop field application test of A~D soil-repairing agents is formulated above：
1) take Hunan county by municipal sewage polluted farmland soil as experimental plot, carry out field plot trial：In soil
The content of Heavy Metals cadmium is 0.45mg/kg.
The experimental plot is divided into 16 experimental plots, totally 4 processing, each processing do 4 it is parallel, formula A~D enters
One processing of row.Plot area 5m × 6m, random alignment.During on-test, experimental plot does not first apply any fertilizer, and Tagayasu Den is harrowed
It is flat, single single filling is carried out, minizone string fertilizer string water is prevented.Application soil-repairing agent will each be handled into corresponding cell, soil
Earth renovation agent addition is 200kg/ mus and manually soil-repairing agent is uniformly blended into mud with six tooth harrows and plate pressing field is scalded with wood.
After soil-repairing agent addition, the humidity for keeping soil enough, water content is at least more than 30%, after conserving 3 days, carries out rice transplanting,
Per 4~5 plants of Basic Seedlings of the root and stem of certain plants.Field management is carried out by normal method, until rice harvesting, obtains the content of beary metal of rice grain
Composition such as table 2 below, the harvest amount such as table 2 of paddy rice.
Content of beary metal and harvest during the paddy rice of table 2 is young
Claims (10)
1. a kind of heavy metal polluted soil of farmland renovation agent, it is characterised in that：Including following content of component raw material：
100 parts of clay mineral powder；
Discarded 5~25 parts of water purifier active carbon filter element powder；
Discarded 1~10 part of water purifier fiber ultrafiltration membrane powder；
0.5~1.5 part of pH adjusting agent；
1~10 part of organic fertilizer.
2. heavy metal polluted soil of farmland renovation agent according to claim 1, it is characterised in that：The clay mineral powder
For at least one of sepiolite powder, bentonite powder, dolomite powder, zeolite powder；
The discarded water purifier active carbon filter element powder is by discarding the active carbon filter core in water purifier by crushing and crossing 150 mesh sieves
Obtain；
The active carbon filter core includes preposition granular activated carbon filter core, preposition extruded activated carbon filter core, post active carbon T33 filter cores
At least one of；
The discarded water purifier fiber ultrafiltration membrane powder is by discarding the fiber ultrafiltration membrane in water purifier by crushing and crossing 150 mesh sieves
Obtain.
3. heavy metal polluted soil of farmland renovation agent according to claim 1, it is characterised in that：Described pH value regulator
For calcium oxide and/or calcium superphosphate.
4. heavy metal polluted soil of farmland renovation agent according to claim 1, it is characterised in that：The organic fertilizer is by pulse family
Compost is obtained after crushed for plant and stalk mixture.
5. the heavy metal polluted soil of farmland renovation agent according to any one of Claims 1 to 4, it is characterised in that：
It is made up of following content of component raw material：
100 parts of sepiolite powder；
Discarded 8~18 parts of water purifier active carbon filter element powder；
Discarded 5~10 parts of water purifier fiber ultrafiltration membrane powder；
0.8~1.2 part of pH adjusting agent；
5~8 parts of organic fertilizer.
6. the preparation method of the heavy metal polluted soil of farmland renovation agent described in any one of Claims 1 to 5, it is characterised in that：
Comprise the following steps：
1) discarded water purifier active carbon filter element powder and clay mineral powder are dispersed in water, pH is to 2~5 for regulation, is transferred to water
In thermal response kettle, hydro-thermal reaction is carried out at a temperature of 120~150 DEG C；
2) hydro-thermal reaction product is placed under protective atmosphere, in 400~600 DEG C of temperature lower calcinations；
3) calcined product is mixed with discarded water purifier fiber ultrafiltration membrane powder, pH adjusting agent and organic fertilizer, is produced.
7. the preparation method for the heavy metal polluted soil of farmland renovation agent stated according to claim 6, it is characterised in that：The hydro-thermal
The time of reaction is 10~20h.
8. the heavy metal polluted soil of farmland renovation agent preparation method stated according to claim 6, it is characterised in that：The calcining
Time is 2~6h.
9. the application of the heavy metal polluted soil of farmland renovation agent described in any one of Claims 1 to 5, it is characterised in that：Using
In heavy metal polluted soil of farmland reparation, to reduce crop heavy metal content and increasing crop yield.
10. the application of heavy metal polluted soil of farmland renovation agent according to claim 9, it is characterised in that：By the soil
Earth renovation agent in heavy-metal contaminated soil, is kept soil moisture content more than 25%, realizes agriculture by 150~250kg/ mus of additions
Heavy metal ion in the heavy-metal contaminated soil of field purifies and increase soil fertility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN112266792A (en) * | 2020-10-22 | 2021-01-26 | 江西省地质工程(集团)公司 | Heavy metal contaminated soil composite passivator and preparation method thereof |
| CN112779022A (en) * | 2021-01-15 | 2021-05-11 | 清华大学 | Heavy metal contaminated soil remediation agent and preparation method and application thereof |
| CN114806591A (en) * | 2022-03-18 | 2022-07-29 | 安庆师范大学 | Farmland passivator for treating soil heavy metal pollution and preparation method thereof |
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