CN107695091A - A kind of soil-repairing agent of Cd-polluted farmland and its production and use - Google Patents
A kind of soil-repairing agent of Cd-polluted farmland and its production and use Download PDFInfo
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- CN107695091A CN107695091A CN201710858633.XA CN201710858633A CN107695091A CN 107695091 A CN107695091 A CN 107695091A CN 201710858633 A CN201710858633 A CN 201710858633A CN 107695091 A CN107695091 A CN 107695091A
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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
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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Abstract
The invention provides a kind of soil-repairing agent of Cd-polluted farmland and its production and use, the soil-repairing agent mainly includes following components by weight：15 parts~45 parts of 5 parts~20 parts of montmorillonite, 5 parts~20 parts of magnesia, 15 parts~45 parts of biological calcium material and charcoal；The synergy of four kinds of components, is passivated to farmland cadmium more than, substantially reduces free cadmium content in soil.The soil-repairing agent of the present invention has the advantages that cost is low, repairing effect is good, composition safety, use range is wide and repairing efficiency is short.
Description
Technical field
The invention belongs to soil remediation field, is related to a kind of soil-repairing agent of Cd-polluted farmland and preparation method thereof and uses
On the way.
Background technology
Cadmium is one of heavy metal element that activity is stronger in soil environment, the cadmium in farm environment, can pass through crop root
It is absorbed by plants, and then is enriched with plant, enters human body eventually through food chain.Cadmium accumulates in the liver of human body, kidney portion, meeting
The visceral organ injuries such as renal tubule are caused, cause renal insufficiency, and human body skeletal metabolism is obstructed, then trigger bone lesion, danger
Evil human health.However, into the cadmium in human body, there is presently no safely and effectively method for removing.In April, 2014《National soil
Earth Survey of contaminating status publication》It has been shown that, super punctuation bit highest is exactly cadmium in China's all contaminants, and super punctuation bit reaches
7.0%.Arable soil point position exceeding standard rate is 19.4%, and cadmium is one of its main exceeded pollutant.During agricultural land soil cadmium is mainly
Slight pollution, but repair process requirement can not produce large effect to soil texture, it is impossible to compared with the agricultural valency of havoc soil
Value and fertility level, can not cause secondary pollution to soil, and this requires that searching one is safe, environment-friendly, quick
Mode is repaired to agricultural land soil cadmium pollution.
Currently for the recovery technique of farmland cadmium pollution, mainly there are physical restoration, biological restoration and chemical restoration.
Wherein, physical restoration common engineering amount is big, and cost is higher, implements complexity, and often results in soil texture destruction, Fertility Degeneration
Deng；Biological restoration is that the cadmium in soil is removed or fixed using modes such as phytoremediation and microorganism remediations mostly,
Repair that safer, cost is cheap and does not interfere with the agricultural value of agricultural land soil to agricultural land soil cadmium pollution, it is but biological prosthetic
Cycle length, slowly effect and repairing effect are limited by soil contamination grade and geographical position etc., are not suitable for being widely applied.Together
When, biological restoration or cadmium is fixed on by soil by plant root exudation organic matter, or eat fixation by microorganism
At it in vivo, both the above mode is few to the fixed amount of cadmium, and cadmium is still present in soil, environmental pollution wind still be present
Danger.In addition, plant is repaired to cadmium in soil, it can also be absorbed by root system of plant, cadmium is enriched in plant, and this
The process that harmless treatment is carried out to plant also be present, add rehabilitation cost and repair procedure.Relative to biological restoration, change
It is the mobility that heavy metal in soil ion is reduced using chemical substance to learn repairing method, and mainly farmland is entered with chemical remediation agent
The passivation of row in-situ chemical is repaired, quick, repairing efficiency is short, cost is low, does not destroy soil texture；Meanwhile the battalion in passivator
Foster element is added in soil, can be utilized as the nutrient needed for plant for plant absorption.
For farmland cadmium pollution reparation, existing passivation is repaired medicament and much reported.As the A of CN 105567249 are public
A kind of agricultural land soil cadmium pollution chemical remediation agent is opened, main component is humic acid, ammonium sulfate, potassium dihydrogen phosphate, citric acid, Jiao
Disodium dihydrogen, biosurfactant, cadmium chemical antidote and bentonite, its composition is complex, and organic component compared with
It is more, soil environment is had a strong impact on, and the calacareous soil in the north is primarily adapted for use in, it is ineffective to acid soil in the south.CN
105273721A discloses a kind of farmland renovation agent of heavy metal cadmium, and main component is quick lime, lime stone, sepiolite, vermiculite
And attapulgite, it is primarily adapted for use in cadmium pollution reparation, it is necessary to limit the application method for repairing medicament, and need to combine blade face
Fertilizer ensures the quality of rice.The A of CN 105838382 disclose a kind of efficiently drop cadmium soil-repairing agent, and main component is modified
Hectorite, organic fertilizer, humic acid and microbial bacterial agent, it is modified hectorite and prepares cumbersome, and microbial bacterial agent is applied in soil,
It can be influenceed by different soils environmental aspect, while the existence to indigenous microorganism impacts, and organic fertilizer can be soil
Earth provides nutriment, improves soil texture, increases the absorption to cadmium, but may also introduce new heavy metal or micro- life simultaneously
Thing, the risk of secondary pollution be present.The A of CN 105713616 disclose a kind of cadmium pollution soil renovation agent, and main component is biology
Matter charcoal, iron powder, plant ash, vulcanized sodium and zeolite, but its whether preparation method or application method are all complex, and use
Iron powder can greatly increase production cost, can additionally cause the heavy metal pollution of soil again, and can be by the shadow of soil acid-base environment
Ring.
Generally speaking, all there is its limitation in existing chemical remediation agent at present, it is necessary to long benefit is taken from various methods
It is short, develop it is a kind of efficiently, cost is low, safe and widely used soil-repairing agent.
The content of the invention
The problem of existing for existing farmland cadmium pollution, it is an object of the invention to provide it is a kind of it is environment-friendly, cost is low,
Repairing efficiency is short and the soil-repairing agent of the farmland cadmium pollution of heavy metal cadmium good passivation effect.The present invention passes through four kinds of raw materials
Coordinated, farmland cadmium is passivated, soil is utilized with long-term sustainable.Meanwhile the present invention is easy to scene should
With not interfering with the agricultural value of agricultural land soil；Carbon source can also be provided for soil, be advantageous to increase soil fertility.
To use following technical scheme up to this purpose, the present invention：
In a first aspect, the invention provides a kind of soil-repairing agent of Cd-polluted farmland, the soil-repairing agent is by weight
Part meter mainly includes following components：
Wherein, the parts by weight of the montmorillonite can be 5 parts, 7 parts, 10 parts, 13 parts, 15 parts, 17 parts or 20 parts etc., but not
Cited numerical value is only limitted to, other unrequited numerical value are equally applicable in the number range；The parts by weight of the magnesia can
For 5 parts, 7 parts, 10 parts, 13 parts, 15 parts, 17 parts or 20 parts etc., it is not limited to cited numerical value, in the number range its
His unrequited numerical value is equally applicable；The parts by weight of biological calcium material can be 15 parts, 17 parts, 20 parts, 23 parts, 25 parts, 27 parts, 30
Part, 33 parts, 35 parts, 37 parts, 40 parts, 43 parts or 45 parts etc., it is not limited to cited numerical value, in the number range other
Unrequited numerical value is equally applicable；The parts by weight of the charcoal can be 15 parts, 17 parts, 20 parts, 23 parts, 25 parts, 27 parts, 30
Part, 33 parts, 35 parts, 37 parts, 40 parts, 43 parts or 45 parts etc., it is not limited to cited numerical value, in the number range other
Unrequited numerical value is equally applicable.
In the present invention, the soil-repairing agent is made using above-mentioned four kinds of materials as key substance by the collaboration of four kinds of materials
It is passivated with to farmland cadmium, while keeps the structure and acid-base balance of soil, makes soil can be with long-term sustainable profit
With, and single addition any of which material is unable to reach preferable repairing effect.
In the present invention, the montmorillonite stone soil is a kind of common clay mineral type, and pollution risk is not present to soil,
Binding site is provided for cadmium；
The magnesia can improve soil pH, and cadmium can be made to form the form of cadmium hydroxide or cadmium carbonate.Magnesia is in soil
Middle generation magnesium carbonate acicular crystal, the crystal are combined to form mask pattern structure with soil particle, and cadmium can be fixed on to the structure
Among space；Meanwhile to a certain extent, fertiliser containing magnesium is alternatively arranged as, it is that agricultural land soil and crops supplement Mg nutrient；
The biological calcium material, its cheap and easy to get and non-secondary pollution, using calcium carbonate as main component, is applied in soil
In, be advantageous to improve soil pH, make cadmium formed cadmium hydroxide precipitation, calcium ion to cadmium ion formed antagonism, reduce plant to every
Absorption, while turn into soil calcium source, Ca ions are more in soil, are advantageous to the formation of soil granular, so as to improved soil structure；
The charcoal provides adsorption site for cadmium, coordinates magnesia and biological calcium material, can increase substantially cadmium
Removal effect；It can provide carbon source for soil simultaneously, strengthen the growth of indigenous microorganism, improved soil, increase soil fertility.
Currently preferred technical scheme is used as below, but not as the limitation of technical scheme provided by the invention, is passed through
Following technical scheme, it can preferably reach and realize the technical purpose and beneficial effect of the present invention.
As currently preferred technical scheme, the soil-repairing agent mainly includes following components by weight：
Preferably, the soil-repairing agent mainly includes following components by weight：
As currently preferred technical scheme, montmorillonite, magnesia, biological calcium material and life in the soil-repairing agent
The mass ratio of thing charcoal is (0.5~1.5):(0.5~1.5):(1.5~2.5):(1.5~2.5), for example, 0.5:(0.5~
1.5):(1.5~2.5):(1.5~2.5), 0.7:(0.5~1.5):(1.5~2.5):(1.5~2.5), 1:(0.5~1.5):
(1.5~2.5):(1.5~2.5), 1.3:(0.5~1.5):(1.5~2.5):(1.5~2.5) or 1.5:(0.5~1.5):
(1.5~2.5):(1.5~2.5) etc., and for example (0.5~1.5):0.5:(1.5~2.5):(1.5~2.5), (0.5~1.5):
0.7:(1.5~2.5):(1.5~2.5), (0.5~1.5):1:(1.5~2.5):(1.5~2.5), (0.5~1.5):1.3:
(1.5~2.5):(1.5~2.5) or (0.5~1.5):1.5:(1.5~2.5):(1.5~2.5), and for example (0.5~1.5):
(0.5~1.5):1.5:(1.5~2.5), (0.5~1.5):(0.5~1.5):1.7:(1.5~2.5), (0.5~1.5):
(0.5~1.5):2:(1.5~2.5), (0.5~1.5):(0.5~1.5):2.3:(1.5~2.5) or (0.5~1.5):(0.5
~1.5):2.5:(1.5~2.5) etc., for another example (0.5~1.5):(0.5~1.5):(1.5~2.5):1.5th, (0.5~1.5):
(0.5~1.5):(1.5~2.5):1.7th, (0.5~1.5):(0.5~1.5):(1.5~2.5):2nd, (0.5~1.5):(0.5
~1.5):(1.5~2.5):2.3 or (0.5~1.5):(0.5~1.5):(1.5~2.5):2.5 etc., can also be such as 0.5:0.5:
1.5:1.5、0.7:0.7:1.7:1.7、0.8:0.9:2:2.3、1:1:2:2、1.3:1.5:2.3:2.3 or 1.5:1.5:2.5:
2.5 etc., it is not limited to cited numerical value, other interior unrequited numerical value of the number range are equally applicable, and preferably 1:
1:2:2。
In the present invention, the ratio of each raw material is not any addition, and the dosage of each material has for the clean-up effect of cadmium
There is crucial effect, be 1 by the mass ratio of montmorillonite, magnesia, biological calcium material and charcoal:1:2:When 2, the purification that is reached
Effect is optimal.
As currently preferred technical scheme, the mesh number of the montmorillonite is the mesh of 100 mesh~300, such as 100 mesh, 140
Mesh, 160 mesh, 180 mesh, 200 mesh, 240 mesh, 260 mesh, 280 mesh or 300 mesh etc., it is not limited to cited numerical value, the number
Other unrequited numerical value are equally applicable in the range of value, preferably 200 mesh.
Preferably, the montmorillonite is sodium-based montmorillonite and/or calcium-base montmorillonite.
Preferably, in the magnesia MgO content >=65wt%.
Preferably, the biological calcium material be oyster shell, marine rainbow shell, Arca Subcrenata, eggshell or corallite in any one or
At least two polished obtained material of combination, it is not limited to cited biological calcium material, other equally may be used
The biological calcium material to achieve the goal is equally applicable to the present invention.
Preferably, the mesh number of the biological calcium material is the mesh of 50 mesh~200, for example, 50 mesh, 80 mesh, 100 mesh, 120 mesh,
140 mesh, 160 mesh, 180 mesh or 200 mesh etc., it is not limited to cited numerical value, other are unrequited in the number range
Numerical value is equally applicable, preferably 100 mesh.
Preferably, the charcoal is straw charcoal, preferably maize straw charcoal and/or wheat stalk charcoal.
Second aspect, the invention provides the preparation method of above-mentioned soil-repairing agent, the preparation method is：By formula ratio
Montmorillonite, magnesia, biological calcium substance and charcoal mixing, be ground, obtain soil-repairing agent.
It is described to be ground to be ground to the mesh of 50 mesh~300 as currently preferred technical scheme, for example, 50 mesh, 80 mesh,
100 mesh, 140 mesh, 160 mesh, 180 mesh, 200 mesh, 240 mesh, 260 mesh, 280 mesh or 300 mesh etc., it is not limited to cited
Numerical value, other interior unrequited numerical value of the number range are equally applicable, preferably 100 mesh.
The third aspect, the invention provides the application method of above-mentioned soil-repairing agent, methods described is：The soil is repaiied
Multiple agent puts on Cd-polluted farmland, and its applied amount is 300kg/ mus~600kg/ mus, for example, 300kg/ mus, 350kg/ mus,
400kg/ mus, 450kg/ mus, 500kg/ mus, 550kg/ mus or 600kg/ mus etc., it is not limited to cited numerical value, the number
Other unrequited numerical value are equally applicable in the range of value, preferably 400kg/ mus.
Preferably, the dosage of the soil-repairing agent is 0.1wt%~0.25wt% of soil butt quality, such as
0.1wt%, 0.12wt%, 0.15wt%, 0.16wt%, 0.2wt%, 0.25wt% etc., it is not limited to cited number
Value, other interior unrequited numerical value of the number range are equally applicable, preferably 0.15wt%.
As currently preferred technical scheme, methods described is：By the soil-repairing agent 10 days before crop-planting
Spread fertilizer over the fields in soil surface within~15 days, it is mixed with soil by turning over, then spray moisture.
As currently preferred technical scheme, it is described sprinkling moisture amount be soil butt 5wt%~15wt%, example
Such as 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, 11wt%, 12wt%, 13wt%, 14wt% or 15wt%,
It is not limited to cited numerical value, other interior unrequited numerical value of the number range are equally applicable.
Compared with prior art, the invention has the advantages that：
(1) soil-repairing agent of the present invention mainly includes four kinds of montmorillonite, magnesia, biological calcium material and charcoal groups
Point, farmland cadmium is passivated by the synergy of four kinds of materials, soil available Cd content is substantially reduced, makes
Soil available Cd content reduces by more than 75%, and meets Cd contents in the crop of plantation《National food safety standard is eaten
Pollutant is limited the quantity in product》(GB 2762-2017), there is good repairing effect；
(2) soil-repairing agent cost of the present invention is low, preparation method is simple, repairing efficiency is short, use range extensively and just
In field application；
(3) soil-repairing agent each component of the present invention is nontoxic, can keep the structure and acid-base balance of soil, no
The agricultural value of agricultural land soil can be influenceed, soil is utilized with long-term sustainable；
(4) soil-repairing agent of the present invention can provide the nutrition such as carbon source, calcium source and magnesium element for soil, be advantageous to improve
Soil fertility.
Embodiment
For the present invention is better described, technical scheme is readily appreciated, below to the present invention further specifically
It is bright.But following embodiments is only the simple example of the present invention, the scope of the present invention is not represented or limits, this
Invention protection domain is defined by claims.
Specific embodiment of the invention part provide a kind of soil-repairing agent of Cd-polluted farmland and preparation method thereof and
Purposes, the soil-repairing agent mainly include following components by weight：10 parts~15 parts of montmorillonite, magnesia 10 parts~15
20 parts~40 parts of part, 20 parts~40 parts of biological calcium material and charcoal.
Its application method is that the soil-repairing agent is put on into Cd-polluted farmland, its applied amount be 300kg/ mus~
600kg/ mus.
It is below present invention typical case but non-limiting example：
Embodiment 1：
A kind of soil-repairing agent of Cd-polluted farmland and preparation method thereof is present embodiments provided, the soil-repairing agent is pressed
Parts by weight meter mainly includes following components：26 parts of 13 parts of montmorillonite, 13 parts of magnesia, 26 parts of biological calcium material and charcoal；Its
In, the montmorillonite is sodium-based montmorillonite, and mesh number is 200 mesh；MgO content >=65wt% in magnesia；Biological calcium material is
Oyster shell, mesh number are 100 mesh；Charcoal is maize straw charcoal.
Its preparation method is：The montmorillonite of formula ratio, magnesia, biological calcium material and charcoal are mixed, are ground,
Obtain soil-repairing agent.
Embodiment 2：
A kind of soil-repairing agent of Cd-polluted farmland and preparation method thereof is present embodiments provided, the soil-repairing agent is pressed
Parts by weight meter mainly includes following components：25 parts of 10 parts of montmorillonite, 15 parts of magnesia, 20 parts of biological calcium material and charcoal；Its
In, the montmorillonite is calcium-base montmorillonite, and mesh number is 200 mesh；MgO content >=65wt% in magnesia；Biological calcium material is
Marine rainbow shell, mesh number are 100 mesh；Charcoal is wheat stalk charcoal.
The preparation method is same as Example 1.
Embodiment 3：
A kind of soil-repairing agent of Cd-polluted farmland and preparation method thereof is present embodiments provided, the soil-repairing agent is pressed
Parts by weight meter mainly includes following components：25 parts of 15 parts of montmorillonite, 10 parts of magnesia, 25 parts of biological calcium material and charcoal；Its
In, the montmorillonite is calcium-base montmorillonite, and mesh number is 200 mesh；MgO content >=65wt% in magnesia；Biological calcium material is
Eggshell, mesh number are 100 mesh；Charcoal is wheat stalk charcoal.
The preparation method is same as Example 1.
Embodiment 4：
A kind of soil-repairing agent of Cd-polluted farmland and preparation method thereof is present embodiments provided, the soil-repairing agent is pressed
Parts by weight meter mainly includes following components：40 parts of 20 parts of montmorillonite, 20 parts of magnesia, 40 parts of biological calcium material and charcoal；Its
In, the montmorillonite is calcium-base montmorillonite, and mesh number is 200 mesh；MgO content >=65wt% in magnesia；Biological calcium material is
Eggshell, mesh number are 100 mesh；Charcoal is wheat stalk charcoal.
The preparation method is same as Example 1.
Embodiment 5：
The application method of the soil-repairing agent described in embodiment 1 is present embodiments provided, uses it for repairing Hunan Province's strain
The rice terrace cadmium pollution in Zhou Shi Zhuzhou Counties Zhou Ping townshiies area.
This area's contaminated soil blank value is as shown in table 1, target contaminant cadmium leach content be 1.0~1.2 μ g/L (《Gu
Body waste Leaching leaching method sulfonitric method》(HJ/T 299-2007)), less than water environment quality standard
(GB3838-2002) Group III desired value 0.005mg/L, but cadmium content is 0.3mg/kg in rice, is exceeded《Food security state
Pollutant is limited the quantity in family's standard food》The 0.2mg/kg of (GB 2762-2017).To reduce the leaching content of target contaminant cadmium,
Repaired using cadmium pollution rice field of the soil-repairing agent described in the present embodiment 1 to this area.
The zhuzhou, hunan province city cadmium pollution soil background information of table 1
Trial zone is set on No.1 soil, is divided into A, B, C, D and E area, wherein A, B area are by soil butt weight
0.2wt% ratio is added, and C, E area are added in the 0.1wt% of soil butt weight ratio, and the soil weight presses 1.8g/cm3Meter
Calculate, every mu of soil weight is calculated by depth 0.2m, it is known that A, B area respectively add soil-repairing agent 480kg/ mus, and C, E area respectively add soil
Earth renovation agent 240kg/ mus, D areas are control group.
Rice terrace does 20cm × 20cm ridges, while ridge plastic film mulch in field, prevents different demonstration area current from permeating, causes
Cross pollution.After leveling land, soil-repairing agent is uniformly spread fertilizer over the fields, after rotary cultivator is turned over, adds water curing 14d.
To the sulfonitric method leaching test of the soil after reparation, it is as shown in table 2 to leach result：
The repairing test result of 2 embodiment of table 5
Note：ND represents not detect
As can be seen that contaminated soil is after adding mass ratio 0.2wt% and 0.1wt% and repairing medicament, A, B, C and E tetra-
The cadmium in area leaches content and is greatly reduced, and decreases by more than 83.3%, and highest leaches content 0.2 μ g/L after processing, minimum to contain
Amount does not detect (0.2% dosage).After addition passivation medicament, stabilization effect is obvious, and soil pH value becomes without obvious before and after the processing
Change.
The result tested on No. two soil is similar to No.1 soil.
Embodiment 6：
The application method of the soil-repairing agent described in embodiment 1 is present embodiments provided, uses it for repairing Huize, yunnan
The farmland cadmium pollution in county person sea agate colour atla-A Yi cards area.This area's contaminated soil blank value is as shown in table 3, target contaminant
Cadmium, total cadmium content are 4.86~5.04mg/kg, are exceeded《Standard of soil environment quality》Two level mark in (GB 15618-1995)
Quasi- value (pH 6.5~7.5) 0.3mg/kg；Leach content 19.6~23.7 μ g/L (《Solid waste Leaching leaching method
Sulfonitric method》(HJ/T 299-2007)), exceed Groundwater Environmental Quality standard (GB/T14848-93) IV class standard values
0.01mg/L.It is less than 0.01mg/L to make target contaminant cadmium leach content, and soil pH meets 6.0~9.0 after reparation, uses
Soil-repairing agent described in embodiment 1 is repaired to the Cd-polluted farmland of this area.
The Yunnan Province Huize County cadmium pollution soil background information of table 3
Choose the soil-repairing agent and carry out farmland field test, choose identical plot and add soil butt quality respectively
Medicament in the range of 0.1wt%~0.3wt% (renovation agent and soil dry weight ratio), 5 addition 0.1wt% of setting,
0.15wt%, 0.2wt%, 0.25wt%, 0.3wt%, conserve one week.
It is as shown in table 4 to repair result, it can be seen that renovation agent dosage is in 0.15wt%~0.3wt% scopes, a huge sum of money
The leaching value of category cadmium is below Groundwater Environmental Quality standard (GB/T14848-93) IV class standard value 0.01mg/L, and soil pH is in
Neutrality, meet acceptance criteria.
The repairing test result of 4 embodiment of table 6
Embodiment 7：
The application method of the soil-repairing agent described in embodiment 1 is present embodiments provided, uses it for repairing Yunnan Province's anger
Jiangzhou Lan Pingxian farmland cadmium pollution.This area soil target contaminant cadmium leach content be 15.6 μ g/L (《Solid waste leaches
Toxicity leaching method sulfonitric method》(HJ/T 299-2007)), exceed water environment quality standard (GB3838-2002)
Group III desired value 0.005mg/L.It is less than 0.005mg/L to make target contaminant cadmium leach content, and soil pH meets after reparation
6.0~9.0, the Cd-polluted farmland of this area is repaired using the soil-repairing agent described in embodiment 1.
Choose the soil-repairing agent and carry out farmland field test, renovation agent is added in soil weight 0.3wt% ratio,
The soil weight presses 1.5g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, it is known that every mu of soil adds renovation agent
600kg, conserve one week.
After reparation, take at random at three soil sample leached (《Solid waste Leaching leaching method sulfonitric method》
(HJ/T 299-2007)), as a result as shown in table 5, after soil remediation, the leaching value of heavy metal cadmium is below《Surface water environment matter
Amount standard》(GB 3838-2002) III class water quality standard value, 83.3%~91.0% is decreased by, soil pH meets in neutrality
Acceptance criteria.
The repairing test result of 5 embodiment of table 7
Embodiment 8：
The application method of the soil-repairing agent described in embodiment 2 is present embodiments provided, uses it for repairing Hunan Province's strain
The rice terrace cadmium pollution in Zhou Shi Zhuzhou Counties Zhou Ping townshiies area.
The pollutant in soil content is as shown in table 1 in embodiment 5.
A areas add renovation agent in the 0.2wt% of soil butt weight ratio on No.1 soil, and the soil weight is pressed
1.8g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, adds soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 6.33, and it is 0.22 μ g/ that cadmium, which leaches content,
L。
Embodiment 9：
The application method of the soil-repairing agent described in embodiment 3 is present embodiments provided, uses it for repairing Hunan Province's strain
The rice terrace cadmium pollution in Zhou Shi Zhuzhou Counties Zhou Ping townshiies area.
The pollutant in soil content is as shown in table 1 in embodiment 5.
A areas add renovation agent in the 0.2wt% of soil butt weight ratio on No.1 soil, and the soil weight is pressed
1.8g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, adds soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 6.46, and it is 0.2 μ g/ that cadmium, which leaches content,
L。
Embodiment 10：
The application method of the soil-repairing agent described in embodiment 4 is present embodiments provided, uses it for repairing Hunan Province's strain
The rice terrace cadmium pollution in Zhou Shi Zhuzhou Counties Zhou Ping townshiies area.
The pollutant in soil content is as shown in table 1 in embodiment 5.
A areas add renovation agent in the 0.2wt% of soil butt weight ratio on No.1 soil, and the soil weight is pressed
1.8g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, adds soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 6.46, and it is 0.21 μ g/ that cadmium, which leaches content,
L。
Comparative example 1：
This comparative example provides the soil-repairing agent and its application method of a kind of Cd-polluted farmland, the trial zone situation with
Embodiment 5 is identical, differs only in, and the soil-repairing agent does not include montmorillonite.Soil dry basis is pressed in A areas on No.1 soil
The 0.2wt% of amount ratio adds renovation agent, and the soil weight presses 1.8g/cm3Calculate, every mu of soil weight is based on depth 0.2m
Calculate, add soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 6.46, and it is 0.9 μ g/ that cadmium, which leaches content,
L。
Comparative example 2：
This comparative example provides the soil-repairing agent and its application method of a kind of Cd-polluted farmland, the trial zone situation with
Embodiment 5 is identical, differs only in, and the soil-repairing agent does not include magnesia.
A areas add renovation agent in the 0.2wt% of soil butt weight ratio on No.1 soil, and the soil weight is pressed
1.8g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, adds soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 6.30, and it is 0.84 μ g/ that cadmium, which leaches content,
L。
Comparative example 3：
This comparative example provides the soil-repairing agent and its application method of a kind of Cd-polluted farmland, the trial zone situation with
Embodiment 5 is identical, differs only in, and the soil-repairing agent does not include biological calcium material.
A areas add renovation agent in the 0.2wt% of soil butt weight ratio on No.1 soil, and the soil weight is pressed
1.8g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, adds soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 7.67, and it is 0.92 μ g/ that cadmium, which leaches content,
L。
Comparative example 4：
This comparative example provides the soil-repairing agent and its application method of a kind of Cd-polluted farmland, the trial zone situation with
Embodiment 1 is identical, differs only in, and the soil-repairing agent does not include charcoal.
A areas add renovation agent in the 0.2wt% of soil butt weight ratio on No.1 soil, and the soil weight is pressed
1.8g/cm3Calculate, every mu of soil weight is calculated by depth 0.2m, adds soil-repairing agent 480kg/ mus.
To the sulfonitric method leaching test of the soil after reparation, the pH of soil is 7.5, and it is 0.72 μ g/ that cadmium, which leaches content,
L。
Summary embodiment and comparative example, which can be seen that soil-repairing agent of the present invention, can make the cadmium that dissociates in soil
Content substantially reduces, and has good repairing effect, wherein four kinds of montmorillonite, magnesia, biological calcium material and charcoal mainly
Component plays synergy, and the dosage of each material has crucial effect for the clean-up effect of cadmium, when montmorillonite, magnesia, biology
The mass ratio of calcium material and charcoal is 1:1:2:When 2, the clean-up effect that is reached is optimal, and single addition or lack wherein is appointed
A kind of what component is unable to reach preferable repairing effect.Meanwhile the soil-repairing agent is applied widely, can be applied to difference
The soil environment in area.
Applicant is declared, and the present invention is illustrated soil-repairing agent of the present invention and its preparation by above-described embodiment and should
With situation, but the invention is not limited in the preparation of above-mentioned soil-repairing agent and applicable cases, that is, do not mean that the present invention is necessary
Relying on above-mentioned preparation method and application situation could implement.Person of ordinary skill in the field is it will be clearly understood that to the present invention's
Any improvement, the change of equivalence replacement and each group distribution ratio to product compositions of the present invention, the choosing of concrete application condition, mode
Select, within the scope of all falling within protection scope of the present invention and disclosing.
Claims (9)
1. a kind of soil-repairing agent of Cd-polluted farmland, it is characterised in that the soil-repairing agent mainly includes by weight
Following components：
2. soil-repairing agent according to claim 1, it is characterised in that the soil-repairing agent mainly wraps by weight
Include following components：
Preferably, the soil-repairing agent mainly includes following components by weight：
3. soil-repairing agent according to claim 1 or 2, it is characterised in that montmorillonite, oxidation in the soil-repairing agent
The mass ratio of magnesium, biological calcium material and charcoal is (0.5~1.5):(0.5~1.5):(1.5~2.5):(1.5~2.5), it is excellent
Elect 1 as:1:2:2.
4. according to the soil-repairing agent described in claim any one of 1-3, it is characterised in that the mesh number of the montmorillonite is 100
The mesh of mesh~300, preferably 200 mesh；
Preferably, the montmorillonite is sodium-based montmorillonite and/or calcium-base montmorillonite；
Preferably, in the magnesia MgO content >=65wt%；
Preferably, the biological calcium material be oyster shell, marine rainbow shell, Arca Subcrenata, eggshell or corallite in any one or at least
Two kinds of the polished obtained material of combination；
Preferably, the mesh number of the biological calcium material is the mesh of 50 mesh~200, preferably 100 mesh；
Preferably, the charcoal is straw charcoal, preferably maize straw charcoal and/or wheat stalk charcoal.
5. the preparation method of the soil-repairing agent according to claim any one of 1-4, it is characterised in that the preparation method
For：The montmorillonite of formula ratio, magnesia, biological calcium material and charcoal are mixed, is ground, obtains soil-repairing agent.
6. preparation method according to claim 5, it is characterised in that it is described to be ground to be ground to the mesh of 50 mesh~300, preferably
For 100 mesh.
7. the application method of the soil-repairing agent according to claim any one of 1-4, it is characterised in that methods described is：
The soil-repairing agent is put on into Cd-polluted farmland, its applied amount is 300kg/ mus~600kg/ mus, preferably 400kg/ mus；
Preferably, the dosage of the soil-repairing agent is 0.1wt%~0.25wt% of soil butt quality, is preferably
0.15wt%.
8. application method according to claim 7, it is characterised in that methods described is：The soil-repairing agent is being made
Species spread fertilizer over the fields in soil surface for 10 days~15 days before planting, and it is mixed with soil by turning over, then spray moisture.
9. application method according to claim 8, it is characterised in that the amount of the sprinkling moisture is soil butt
5wt%~15wt%.
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| CN108218582A (en) * | 2018-03-06 | 2018-06-29 | 段艳玲 | A kind of nutrition slow-release type acid soil improving agent and preparation method thereof |
| CN108559521A (en) * | 2018-05-28 | 2018-09-21 | 北京润鸣环境科技有限公司 | A kind of soil passivator and preparation method thereof and application method reducing geobiont available Cd |
| CN108795430A (en) * | 2018-05-22 | 2018-11-13 | 北京市农林科学院 | A kind of renovation agent and soil remediation method of cadmium pollution soil |
| CN109628099A (en) * | 2018-09-12 | 2019-04-16 | 扬州大学 | A kind of passivation stabilizer for agricultural land soil cadmium pollution reparation and preparation method thereof and application method |
| CN110129063A (en) * | 2018-08-08 | 2019-08-16 | 环境保护部华南环境科学研究所 | A kind of composite material suitable for heavy-metal composite pollution farmland safe utilization |
| CN111440615A (en) * | 2020-04-02 | 2020-07-24 | 南京林业大学 | Preparation of waste source calcium salt-biomass charcoal composite material and application thereof in soil |
| CN112125749A (en) * | 2020-09-02 | 2020-12-25 | 广东佳德环保科技有限公司 | Composite repairing agent for heavy metal contaminated soil and application method thereof |
| CN113877954A (en) * | 2021-09-26 | 2022-01-04 | 中国地质大学（北京） | Passivation restoration agent for cadmium-polluted soil and preparation method and application thereof |
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| CN108218582A (en) * | 2018-03-06 | 2018-06-29 | 段艳玲 | A kind of nutrition slow-release type acid soil improving agent and preparation method thereof |
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| CN111440615A (en) * | 2020-04-02 | 2020-07-24 | 南京林业大学 | Preparation of waste source calcium salt-biomass charcoal composite material and application thereof in soil |
| CN112125749A (en) * | 2020-09-02 | 2020-12-25 | 广东佳德环保科技有限公司 | Composite repairing agent for heavy metal contaminated soil and application method thereof |
| CN113877954A (en) * | 2021-09-26 | 2022-01-04 | 中国地质大学（北京） | Passivation restoration agent for cadmium-polluted soil and preparation method and application thereof |
| CN113877954B (en) * | 2021-09-26 | 2023-06-06 | 中国地质大学（北京） | Passivation restoration agent for cadmium-polluted soil and preparation method and application thereof |
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Application publication date: 20180216 |