CN110982536A - Heavy metal polluted farmland soil remediation agent, preparation method and remediation method thereof - Google Patents
Heavy metal polluted farmland soil remediation agent, preparation method and remediation method thereof Download PDFInfo
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- CN110982536A CN110982536A CN201911322442.7A CN201911322442A CN110982536A CN 110982536 A CN110982536 A CN 110982536A CN 201911322442 A CN201911322442 A CN 201911322442A CN 110982536 A CN110982536 A CN 110982536A
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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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
- C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
-
- 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
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
-
- 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
- C09K2101/00—Agricultural use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Environmental Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Fertilizers (AREA)
Abstract
The invention provides a heavy metal polluted farmland soil remediation agent which comprises the following raw materials in parts by mass: 10-25 parts of medical stone powder, 15-27 parts of carbonized rice hulls, 10-25 parts of steel slag powder, 10-20 parts of weathered coal, 10-25 parts of lime, 10-25 parts of white carbon black and 12-24 parts of organic fertilizer. The heavy metal polluted farmland soil remediation agent is applied to the soil surface of a farmland polluted by heavy metals, is uniformly mixed with soil, keeps the soil moisture to reach the maximum field water holding capacity, and can be used for planting crops after 5-8 days of balance. According to the invention, heavy metals in soil are quickly, efficiently and stably passivated in a combined precipitation, adsorption, complexation, acid-base buffering and other multiple modes, the activity of the heavy metals in the soil is reduced, the passivated heavy metals are prevented from being reactivated again, and the effect of finally reducing the activity of the heavy metals in the farmland soil is achieved.
Description
Technical Field
The invention relates to the technical field of crop food safety control, in particular to a heavy metal polluted farmland soil repairing agent, a preparation method and a repairing method thereof.
Background
The problem of farmland soil pollution is becoming more serious and mainly heavy metal pollution. The current soil heavy metal pollution remediation technology mainly comprises soil leaching, electrodynamic force remediation, bioremediation and solidification remediation.
The soil washing is a method for removing pollutants in soil by washing with water, a surfactant solution and an inorganic salt solution as washing solutions, and the method has the advantages of short repair period and high removal efficiency, but has great change on the physical and chemical properties of the soil, higher cost and possibility of generating secondary pollution. The method is green and environment-friendly, has no secondary pollution, but has the defects of high energy consumption, small restoration range, unsuitability for restoring soil under acidic conditions and the like.
Bioremediation is a hotspot of current research, but the repair rate is slow, the repair period is long, and the large-scale popularization is difficult to achieve.
The curing and repairing method is simple, low in cost, high in efficiency and good in application prospect. However, the existing soil solidification repairing technology has the problems of poor stability, easy cracking, easy occurrence of plate-knot phenomenon and the like after repairing, and is not suitable for farmlands.
Disclosure of Invention
The invention aims to provide a preparation method and a repair method of a heavy metal contaminated farmland soil repair agent aiming at the defects in the prior art, and the preparation method and the repair method have the advantages of low cost, easy implementation, no pollution, effective reduction of heavy metal content in farmlands and the like.
In order to achieve the purpose, the invention adopts the technical scheme that: a soil conditioner for reducing activity of heavy metals in soil is composed of the following raw materials in parts by mass:
10-25 parts of medical stone powder, 15-27 parts of carbonized rice hulls, 10-25 parts of steel slag powder, 10-20 parts of weathered coal, 10-25 parts of lime, 10-25 parts of white carbon black and 12-24 parts of organic fertilizer.
Wherein the medical stone powder and the carbonized rice hulls are respectively sieved by a sieve of 40-60 meshes. And respectively sieving the steel slag powder, the weathered coal and the lime by a sieve of 50-80 meshes. The mesh number of the white carbon black is 200-250 meshes.
The organic fertilizer is fermented poultry and livestock manure fertilizer.
The preparation method of the heavy metal contaminated farmland soil remediation agent comprises the following steps:
(1) 10-25 parts of medical stone powder, 15-27 parts of carbonized rice hulls, 10-25 parts of steel slag powder, 10-20 parts of weathered coal and 10-25 parts of white carbon black are mixed to obtain a mixed material;
(2) adding 10-25 parts of lime and a proper amount of water into the mixed material, and stirring until the mixture is fully chelated;
(3) then adding 12-24 parts of organic fertilizer, and uniformly mixing to obtain a semi-finished product;
(4) and (4) sieving the semi-finished product to obtain the heavy metal polluted farmland soil remediation agent.
The invention also provides a method for restoring the soil of the heavy metal polluted farmland, which comprises the steps of applying the heavy metal polluted farmland soil restoring agent on the soil surface of the farmland polluted by the heavy metal, uniformly mixing the heavy metal polluted farmland soil restoring agent with the soil, keeping the soil moisture to reach the maximum water holding capacity in the farmland, and planting crops after 5-8 days of balance.
The invention has the beneficial effects that: the heavy metal polluted farmland soil remediation agent has the following advantages:
(1) the heavy metal in the polluted farmland soil can be effectively and stably passivated, the soil fertility is improved, the soil tilth is improved, the growth of crops is promoted, the using amount of chemical fertilizer is reduced, and the yield and income increase is facilitated;
(2) the medical stone powder can reduce the activity of heavy metals, provide necessary potassium element for the growth of crops and reduce the use of potassium fertilizer;
(3) the specific microporous structure of the weathered coal enhances the adsorption force of the oyster shell powder, has passivation effect on certain heavy metals, and simultaneously can enhance the air permeability of soil, reduce the soil hardening degree, promote the propagation of soil microorganisms and promote the absorption of crops to nutrients.
(4) The lime contains calcium oxide, and has the effects of regulating acid soil and increasing the calcium content of the soil when being applied to the soil;
(5) the carbonized rice hulls have the characteristics of loosening and porosity, the air permeability of soil is increased, the oxygen supply of the roots of crops is increased, the root diseases are reduced, and the porous characteristic can assist plants in absorbing nutrients. Contains more soluble silicon, and increases the disease resistance of crops.
(6) The steel slag powder can adsorb and passivate heavy metals in soil, provide necessary phosphorus for the growth of crops and reduce the using amount of phosphate fertilizer.
(7) The white carbon black can ensure the fluidity of the product after being added with water through chelation, so that the product is not hardened and is easy to apply, and the water-retaining property of the product in soil can be improved.
(8) The heavy metal in the soil is passivated fast, efficiently and stably through multiple modes such as combined precipitation, adsorption, complexation and acid-base buffering, the activity of the heavy metal in the soil is reduced, the passivated heavy metal is prevented from being activated again, and the effect of finally reducing the activity of the heavy metal in the farmland soil is achieved.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and/or combinations thereof. It is to be understood that the scope of the invention is not to be limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
Example 1
The heavy metal polluted farmland soil remediation agent provided by the embodiment of the invention comprises the following raw materials in parts by mass:
17 parts of medical stone powder, 22 parts of carbonized rice hulls, 14 parts of steel slag powder, 16 parts of weathered coal, 24 parts of lime, 18 parts of white carbon black and 21 parts of organic fertilizer.
The preparation method of the heavy metal polluted farmland soil remediation agent comprises the following steps:
(1) grinding medical stone powder, carbonized rice hulls, steel slag powder, weathered coal and white carbon black raw materials, sieving, and mixing to obtain a mixed material;
(2) adding lime and a proper amount of water into the mixed material, and stirring until the mixture is fully chelated;
(3) then adding an organic fertilizer, and uniformly mixing to obtain a semi-finished product;
(4) and (4) sieving the semi-finished product to obtain the heavy metal polluted farmland soil remediation agent.
Example 2
The heavy metal polluted farmland soil remediation agent provided by the embodiment of the invention comprises the following raw materials in parts by mass:
23 parts of medical stone powder, 22 parts of carbonized rice hulls, 14 parts of steel slag powder, 11 parts of weathered coal, 13 parts of lime, 24 parts of white carbon black and 21 parts of organic fertilizer.
The preparation method of the heavy metal polluted farmland soil remediation agent comprises the following steps:
(1) grinding medical stone powder, carbonized rice hulls, steel slag powder, weathered coal and white carbon black raw materials, sieving, and mixing to obtain a mixed material;
(2) adding lime and a proper amount of water into the mixed material, and stirring until the mixture is fully chelated;
(3) then adding an organic fertilizer, and uniformly mixing to obtain a semi-finished product;
(4) and (4) sieving the semi-finished product to obtain the heavy metal polluted farmland soil remediation agent.
Example 3
The heavy metal polluted farmland soil remediation agent provided by the embodiment of the invention comprises the following raw materials in parts by mass:
22 parts of medical stone powder, 25 parts of carbonized rice hulls, 13 parts of steel slag powder, 17 parts of weathered coal, 23 parts of lime, 21 parts of white carbon black and 18 parts of organic fertilizer.
The preparation method of the heavy metal polluted farmland soil remediation agent comprises the following steps:
(1) grinding medical stone powder, carbonized rice hulls, steel slag powder, weathered coal and white carbon black raw materials, sieving, and mixing to obtain a mixed material;
(2) adding lime and a proper amount of water into the mixed material, and stirring until the mixture is fully chelated;
(3) then adding an organic fertilizer, and uniformly mixing to obtain a semi-finished product;
(4) and (4) sieving the semi-finished product to obtain the heavy metal polluted farmland soil remediation agent.
Example 4
The heavy metal pollution condition of farmland soil in the detection test is shown in table 1.
The method for restoring the heavy metal polluted farmland soil comprises the following steps:
table 1 table of initial heavy metal pollution in soil of farmland
| Item | Cd | Cu(mg/kg) | Pb(mg/kg) | Zn(mg/kg) |
| Content (wt.) | 1.54 | 169.73 | 197.44 | 243.15 |
The farmland was divided equally into four lands, three of which were applied at a rate of 250 kg/mu, and the soil remediation agent obtained in examples 1 to 3 was applied to the soil surface of the farmland contaminated with heavy metals.
Then, ploughing the land by using a farming machine, uniformly mixing the soil remediation agent with the soil, keeping the moisture of the soil to reach the maximum field water holding capacity, and transplanting the rapes after 5 days of balance;
for comparison, another land was set as a comparative example, the soil of the comparative example was not repaired, and rape was transplanted at the same time as in the examples, and the same seed management was adopted.
Rape leaves harvested in comparative example 1 and rape leaves harvested in example were both subjected to HNO3-HClO4The method is used for digestion, and the heavy metal content in the rape leaves is measured by an atomic absorption spectrophotometry. Examples the results of the tests of the proportions of the respective heavy metal contents with respect to the corresponding heavy metal contents in comparative example 1 are shown in table 2:
TABLE 2 reduction of heavy metal content in rape leaves
| Heavy metal species | Cd | Pb | Cu | Zn |
| Example 1 reduction Rate | 67.53％ | 61.47％ | 74.02％ | 54.25％ |
| Example 2 reduction Rate | 70.41％ | 52.94％ | 77.24％ | 53.46％ |
| Example 3 reduction Rate | 65.84％ | 54.37％ | 75.18％ | 55.19％ |
As can be seen from Table 2, the method provided by the embodiment of the invention has a good blocking effect on heavy metal absorption of rape leaves, and can effectively reduce the content of heavy metal in rape leaves.
It should be understood that the above-described embodiments are only some of the embodiments of the present application, and not all of the embodiments, and the preferred embodiments of the present application are given above, but not limiting the scope of the present application. This application is capable of embodiments in many different forms and is provided for the purpose of enabling the disclosure of the present application to be more fully understood. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that various changes in the details of the foregoing embodiments may be made, and equivalents may be substituted for elements thereof. All equivalent structures made by using the content of the specification of the present application are directly or indirectly applied to other related technical fields, and are also within the scope of protection of the present application.
Claims (7)
1. The heavy metal polluted farmland soil remediation agent is characterized by comprising the following raw materials in parts by mass:
10-25 parts of medical stone powder, 15-27 parts of carbonized rice hulls, 10-25 parts of steel slag powder, 10-20 parts of weathered coal, 10-25 parts of lime, 10-25 parts of white carbon black and 12-24 parts of organic fertilizer.
2. The soil remediation agent for heavy metal contaminated farmland as claimed in claim 1, wherein the medical stone powder and the carbonized rice husk are respectively sieved with 40-60 mesh sieves.
3. The heavy metal contaminated farmland soil remediation agent of claim 1, wherein the steel slag powder, the weathered coal and the lime are respectively sieved by a 50-80 mesh sieve.
4. The heavy metal contaminated farmland soil remediation agent of claim 1, wherein the mesh number of the white carbon black is 200-250 mesh.
5. The heavy metal contaminated farmland soil remediation agent of claim 1, wherein said organic fertilizer is fermented poultry and livestock manure fertilizer.
6. The preparation method of the heavy metal contaminated farmland soil remediation agent according to any one of claims 1 to 5, wherein the preparation method comprises the following steps:
(1) 10-25 parts of medical stone powder, 15-27 parts of carbonized rice hulls, 10-25 parts of steel slag powder, 10-20 parts of weathered coal and 10-25 parts of white carbon black are mixed to obtain a mixed material;
(2) adding 10-25 parts of lime and a proper amount of water into the mixed material, and stirring until the mixture is fully chelated;
(3) then adding 12-24 parts of organic fertilizer, and uniformly mixing to obtain a semi-finished product;
(4) and (4) sieving the semi-finished product to obtain the heavy metal polluted farmland soil remediation agent.
7. The method for restoring the soil of the heavy metal polluted farmland is characterized in that the heavy metal polluted farmland soil restoring agent according to any one of claims 1 to 5 is applied to the soil surface of the farmland polluted by the heavy metal, then the heavy metal polluted farmland soil restoring agent is uniformly mixed with the soil, the water content of the soil is kept to the maximum water holding capacity of the farmland, and the crops can be planted after 5 to 8 days of balance.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575015A (en) * | 2020-06-12 | 2020-08-25 | 江西普瑞丰生态科技有限公司 | Biological repairing agent for farmland heavy metal contaminated soil, preparation method and application |
| CN113058989A (en) * | 2021-03-16 | 2021-07-02 | 苏州益亮生态修复有限公司 | Method for restoring farmland polluted by heavy metals |
| CN114317004A (en) * | 2022-01-28 | 2022-04-12 | 徐光� | Medium-element water-soluble fertilizer and soil conditioner and preparation method thereof |
| CN115305095A (en) * | 2022-09-13 | 2022-11-08 | 江苏润天建材(集团)有限公司 | Heavy metal contaminated soil remediation agent based on smelting slag and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111575015A (en) * | 2020-06-12 | 2020-08-25 | 江西普瑞丰生态科技有限公司 | Biological repairing agent for farmland heavy metal contaminated soil, preparation method and application |
| CN113058989A (en) * | 2021-03-16 | 2021-07-02 | 苏州益亮生态修复有限公司 | Method for restoring farmland polluted by heavy metals |
| CN114317004A (en) * | 2022-01-28 | 2022-04-12 | 徐光� | Medium-element water-soluble fertilizer and soil conditioner and preparation method thereof |
| CN115305095A (en) * | 2022-09-13 | 2022-11-08 | 江苏润天建材(集团)有限公司 | Heavy metal contaminated soil remediation agent based on smelting slag and preparation method thereof |
| CN115305095B (en) * | 2022-09-13 | 2023-10-20 | 江苏润天建材(集团)有限公司 | Heavy metal contaminated soil restoration agent based on smelting slag and preparation method thereof |
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Application publication date: 20200410 |